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+(0199 ) 3.01 Tj
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+0 -3.92728 Td
+(0200 // kalloc.c) 9.632 Tj
+0 -5.23637 Td
+(0201 char* kalloc\(int\);) 13.846 Tj
+0 -6.54546 Td
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+0 -9.16364 Td
+(0204 ) 3.01 Tj
+0 -10.4727 Td
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+0 -11.7818 Td
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+0 -13.0909 Td
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+0 -14.4 Td
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+0 -17.0182 Td
+(0210 ) 3.01 Tj
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+0 -19.6364 Td
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+0 -20.9455 Td
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+(0226 ) 3.01 Tj
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+0 -43.2 Td
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+0 -44.5091 Td
+(0231 ) 3.01 Tj
+0 -45.8182 Td
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+(0235 ) 3.01 Tj
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+0 -57.6 Td
+(0241 ) 3.01 Tj
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+(0249 ) 3.01 Tj
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+0 0 Td
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+0 0 Td
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+0 -3.92728 Td
+(0250 // picirq.c) 9.632 Tj
+0 -5.23637 Td
+(0251 void pic_init\(void\);) 15.05 Tj
+0 -6.54546 Td
+(0252 void irq_enable\(int\);) 15.652 Tj
+0 -7.85455 Td
+(0253 ) 3.01 Tj
+0 -9.16364 Td
+(0254 // 8253pit.c) 10.234 Tj
+0 -10.4727 Td
+(0255 void pit8253_timerinit\(void\);) 20.468 Tj
+0 -11.7818 Td
+(0256 ) 3.01 Tj
+0 -13.0909 Td
+(0257 // mp.c) 7.224 Tj
+0 -14.4 Td
+(0258 extern int ismp;) 12.642 Tj
+0 -15.7091 Td
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+0 -18.3273 Td
+(0261 int mp_bcpu\(void\);) 13.846 Tj
+0 -19.6364 Td
+(0262 ) 3.01 Tj
+0 -20.9455 Td
+(0263 // lapic.c) 9.03 Tj
+0 -22.2545 Td
+(0264 extern uint *lapicaddr;) 16.856 Tj
+0 -23.5636 Td
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+0 -28.8 Td
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+0 -32.7273 Td
+(0272 int cpu\(void\);) 11.438 Tj
+0 -34.0364 Td
+(0273 ) 3.01 Tj
+0 -35.3454 Td
+(0274 // ioapic.c) 9.632 Tj
+0 -36.6545 Td
+(0275 extern uchar ioapic_id;) 16.856 Tj
+0 -37.9636 Td
+(0276 void ioapic_init\(void\);) 16.856 Tj
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+(0277 void ioapic_enable\(int irq, int cpu\);) 25.284 Tj
+0 -40.5818 Td
+(0278 ) 3.01 Tj
+0 -41.8909 Td
+(0279 // spinlock.c) 10.836 Tj
+0 -43.2 Td
+(0280 struct spinlock;) 12.642 Tj
+0 -44.5091 Td
+(0281 void initlock\(struct spinlock*, char*\);) 26.488 Tj
+0 -45.8182 Td
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+0 -47.1272 Td
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+0 -48.4363 Td
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+0 -49.7454 Td
+(0285 void getcallerpcs\(void*, uint*\);) 22.274 Tj
+0 -51.0545 Td
+(0286 ) 3.01 Tj
+0 -52.3636 Td
+(0287 // main.c) 8.428 Tj
+0 -53.6727 Td
+(0288 void load_icode\(struct proc*, uchar*, uint\);) 29.498 Tj
+0 -54.9818 Td
+(0289 ) 3.01 Tj
+0 -56.2909 Td
+(0290 // pipe.c) 8.428 Tj
+0 -57.6 Td
+(0291 struct pipe;) 10.234 Tj
+0 -58.9091 Td
+(0292 struct file;) 10.234 Tj
+0 -60.2181 Td
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+0 -61.5272 Td
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+0 -64.1454 Td
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+0 -65.4545 Td
+(0297 ) 3.01 Tj
+0 -66.7636 Td
+(0298 ) 3.01 Tj
+0 -68.0727 Td
+(0299 ) 3.01 Tj
+0 -72 Td
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+0 0 Td
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+(Sep 8 11:37 2006 xv6/defs.h Page 3) 22.274 Tj
+0 -3.92728 Td
+(0300 // file.c) 8.428 Tj
+0 -5.23637 Td
+(0301 struct stat;) 10.234 Tj
+0 -6.54546 Td
+(0302 void fileinit\(void\);) 15.05 Tj
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+0 -13.0909 Td
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+0 -14.4 Td
+(0308 void fileincref\(struct file*\);) 21.07 Tj
+0 -15.7091 Td
+(0309 ) 3.01 Tj
+0 -17.0182 Td
+(0310 // ide.c) 7.826 Tj
+0 -18.3273 Td
+(0311 void ide_init\(void\);) 15.05 Tj
+0 -19.6364 Td
+(0312 void ide_intr\(void\);) 15.05 Tj
+0 -20.9455 Td
+(0313 void ide_rw\(int, uint, void*, uint, int\);) 27.692 Tj
+0 -22.2545 Td
+(0314 ) 3.01 Tj
+0 -23.5636 Td
+(0315 // bio.c) 7.826 Tj
+0 -24.8727 Td
+(0316 void binit\(void\);) 13.244 Tj
+0 -26.1818 Td
+(0317 struct buf;) 9.632 Tj
+0 -27.4909 Td
+(0318 struct buf* getblk\(uint dev, uint sector\);) 28.294 Tj
+0 -28.8 Td
+(0319 struct buf* bread\(uint, uint\);) 21.07 Tj
+0 -30.1091 Td
+(0320 void bwrite\(struct buf*, uint\);) 21.672 Tj
+0 -31.4182 Td
+(0321 void brelse\(struct buf*\);) 18.06 Tj
+0 -32.7273 Td
+(0322 ) 3.01 Tj
+0 -34.0364 Td
+(0323 // fs.c) 7.224 Tj
+0 -35.3454 Td
+(0324 extern uint rootdev;) 15.05 Tj
+0 -36.6545 Td
+(0325 void iinit\(void\);) 13.244 Tj
+0 -37.9636 Td
+(0326 struct inode* iget\(uint, uint\);) 21.672 Tj
+0 -39.2727 Td
+(0327 void ilock\(struct inode*\);) 18.662 Tj
+0 -40.5818 Td
+(0328 void iunlock\(struct inode*\);) 19.866 Tj
+0 -41.8909 Td
+(0329 void itrunc\(struct inode*\);) 19.264 Tj
+0 -43.2 Td
+(0330 void idecref\(struct inode*\);) 19.866 Tj
+0 -44.5091 Td
+(0331 void iincref\(struct inode*\);) 19.866 Tj
+0 -45.8182 Td
+(0332 void iput\(struct inode*\);) 18.06 Tj
+0 -47.1272 Td
+(0333 struct inode* namei\(char*, int, uint*, char**, struct inode**\);) 40.936 Tj
+0 -48.4363 Td
+(0334 void stati\(struct inode*, struct stat*\);) 27.09 Tj
+0 -49.7454 Td
+(0335 int readi\(struct inode*, char*, uint, uint\);) 29.498 Tj
+0 -51.0545 Td
+(0336 int writei\(struct inode*, char*, uint, uint\);) 30.1 Tj
+0 -52.3636 Td
+(0337 struct inode* mknod\(char*, short, short, short\);) 31.906 Tj
+0 -53.6727 Td
+(0338 struct inode* mknod1\(struct inode*, char*, short, short, short\);) 41.538 Tj
+0 -54.9818 Td
+(0339 int unlink\(char*\);) 13.846 Tj
+0 -56.2909 Td
+(0340 void iupdate\(struct inode*\);) 19.866 Tj
+0 -57.6 Td
+(0341 int link\(char*, char*\);) 16.856 Tj
+0 -58.9091 Td
+(0342 ) 3.01 Tj
+0 -60.2181 Td
+(0343 ) 3.01 Tj
+0 -61.5272 Td
+(0344 ) 3.01 Tj
+0 -62.8363 Td
+(0345 ) 3.01 Tj
+0 -64.1454 Td
+(0346 ) 3.01 Tj
+0 -65.4545 Td
+(0347 ) 3.01 Tj
+0 -66.7636 Td
+(0348 ) 3.01 Tj
+0 -68.0727 Td
+(0349 ) 3.01 Tj
+0 -72 Td
+(Sheet 03) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/x86.h Page 1) 21.672 Tj
+0 -3.92728 Td
+(0350 // Special assembly routines to access x86-specific) 33.712 Tj
+0 -5.23637 Td
+(0351 // hardware instructions.) 18.06 Tj
+0 -6.54546 Td
+(0352 ) 3.01 Tj
+0 -7.85455 Td
+(0353 static __inline uchar) 15.652 Tj
+0 -9.16364 Td
+(0354 inb\(int port\)) 10.836 Tj
+0 -10.4727 Td
+(0355 {) 3.612 Tj
+0 -11.7818 Td
+(0356 uchar data;) 10.836 Tj
+0 -13.0909 Td
+(0357 __asm __volatile\("inb %w1,%0" : "=a" \(data\) : "d" \(port\)\);) 39.13 Tj
+0 -14.4 Td
+(0358 return data;) 11.438 Tj
+0 -15.7091 Td
+(0359 }) 3.612 Tj
+0 -17.0182 Td
+(0360 ) 3.01 Tj
+0 -18.3273 Td
+(0361 static __inline void) 15.05 Tj
+0 -19.6364 Td
+(0362 insl\(int port, void *addr, int cnt\)) 24.08 Tj
+0 -20.9455 Td
+(0363 {) 3.612 Tj
+0 -22.2545 Td
+(0364 __asm __volatile\("cld\\n\\trepne\\n\\tinsl" :) 31.304 Tj
+0 -23.5636 Td
+(0365 "=D" \(addr\), "=c" \(cnt\) :) 31.304 Tj
+0 -24.8727 Td
+(0366 "d" \(port\), "0" \(addr\), "1" \(cnt\) :) 36.12 Tj
+0 -26.1818 Td
+(0367 "memory", "cc"\);) 24.08 Tj
+0 -27.4909 Td
+(0368 }) 3.612 Tj
+0 -28.8 Td
+(0369 ) 3.01 Tj
+0 -30.1091 Td
+(0370 static __inline void) 15.05 Tj
+0 -31.4182 Td
+(0371 outb\(int port, uchar data\)) 18.662 Tj
+0 -32.7273 Td
+(0372 {) 3.612 Tj
+0 -34.0364 Td
+(0373 __asm __volatile\("outb %0,%w1" : : "a" \(data\), "d" \(port\)\);) 39.732 Tj
+0 -35.3454 Td
+(0374 }) 3.612 Tj
+0 -36.6545 Td
+(0375 ) 3.01 Tj
+0 -37.9636 Td
+(0376 static __inline void) 15.05 Tj
+0 -39.2727 Td
+(0377 outw\(int port, ushort data\)) 19.264 Tj
+0 -40.5818 Td
+(0378 {) 3.612 Tj
+0 -41.8909 Td
+(0379 __asm __volatile\("outw %0,%w1" : : "a" \(data\), "d" \(port\)\);) 39.732 Tj
+0 -43.2 Td
+(0380 }) 3.612 Tj
+0 -44.5091 Td
+(0381 ) 3.01 Tj
+0 -45.8182 Td
+(0382 static __inline void) 15.05 Tj
+0 -47.1272 Td
+(0383 outsl\(int port, const void *addr, int cnt\)) 28.294 Tj
+0 -48.4363 Td
+(0384 {) 3.612 Tj
+0 -49.7454 Td
+(0385 __asm __volatile\("cld\\n\\trepne\\n\\toutsl" :) 31.304 Tj
+0 -51.0545 Td
+(0386 "=S" \(addr\), "=c" \(cnt\) :) 31.304 Tj
+0 -52.3636 Td
+(0387 "d" \(port\), "0" \(addr\), "1" \(cnt\) :) 36.12 Tj
+0 -53.6727 Td
+(0388 "cc"\);) 18.06 Tj
+0 -54.9818 Td
+(0389 }) 3.612 Tj
+0 -56.2909 Td
+(0390 ) 3.01 Tj
+0 -57.6 Td
+(0391 ) 3.01 Tj
+0 -58.9091 Td
+(0392 ) 3.01 Tj
+0 -60.2181 Td
+(0393 ) 3.01 Tj
+0 -61.5272 Td
+(0394 ) 3.01 Tj
+0 -62.8363 Td
+(0395 ) 3.01 Tj
+0 -64.1454 Td
+(0396 ) 3.01 Tj
+0 -65.4545 Td
+(0397 ) 3.01 Tj
+0 -66.7636 Td
+(0398 ) 3.01 Tj
+0 -68.0727 Td
+(0399 ) 3.01 Tj
+0 -72 Td
+(Sheet 03) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 11 11
+%%BeginPageSetup
+%%PageOrientation: Landscape
+pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
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+(0400 struct segdesc;) 12.04 Tj
+0 -5.23637 Td
+(0401 ) 3.01 Tj
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+(0402 static __inline void) 15.05 Tj
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+0 -9.16364 Td
+(0404 {) 3.612 Tj
+0 -10.4727 Td
+(0405 volatile ushort pd[3];) 17.458 Tj
+0 -11.7818 Td
+(0406 ) 3.01 Tj
+0 -13.0909 Td
+(0407 pd[0] = size-1;) 13.244 Tj
+0 -14.4 Td
+(0408 pd[1] = \(uint\)p;) 13.846 Tj
+0 -15.7091 Td
+(0409 pd[2] = \(uint\)p >> 16;) 17.458 Tj
+0 -17.0182 Td
+(0410 ) 3.01 Tj
+0 -18.3273 Td
+(0411 asm volatile\("lgdt \(%0\)" : : "g" \(pd\)\);) 27.692 Tj
+0 -19.6364 Td
+(0412 }) 3.612 Tj
+0 -20.9455 Td
+(0413 ) 3.01 Tj
+0 -22.2545 Td
+(0414 struct gatedesc;) 12.642 Tj
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+(0415 ) 3.01 Tj
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+(0416 static __inline void) 15.05 Tj
+0 -26.1818 Td
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+0 -27.4909 Td
+(0418 {) 3.612 Tj
+0 -28.8 Td
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+0 -30.1091 Td
+(0420 ) 3.01 Tj
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+0 -32.7273 Td
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+0 -34.0364 Td
+(0423 pd[2] = \(uint\)p >> 16;) 17.458 Tj
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+(0424 ) 3.01 Tj
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+0 -37.9636 Td
+(0426 }) 3.612 Tj
+0 -39.2727 Td
+(0427 ) 3.01 Tj
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+(0428 static __inline void) 15.05 Tj
+0 -41.8909 Td
+(0429 ltr\(ushort sel\)) 12.04 Tj
+0 -43.2 Td
+(0430 {) 3.612 Tj
+0 -44.5091 Td
+(0431 __asm __volatile\("ltr %0" : : "r" \(sel\)\);) 28.896 Tj
+0 -45.8182 Td
+(0432 }) 3.612 Tj
+0 -47.1272 Td
+(0433 ) 3.01 Tj
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+(0434 static __inline uint) 15.05 Tj
+0 -49.7454 Td
+(0435 read_eflags\(void\)) 13.244 Tj
+0 -51.0545 Td
+(0436 {) 3.612 Tj
+0 -52.3636 Td
+(0437 uint eflags;) 11.438 Tj
+0 -53.6727 Td
+(0438 __asm __volatile\("pushfl; popl %0" : "=r" \(eflags\)\);) 35.518 Tj
+0 -54.9818 Td
+(0439 return eflags;) 12.642 Tj
+0 -56.2909 Td
+(0440 }) 3.612 Tj
+0 -57.6 Td
+(0441 ) 3.01 Tj
+0 -58.9091 Td
+(0442 static __inline void) 15.05 Tj
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+(0443 write_eflags\(uint eflags\)) 18.06 Tj
+0 -61.5272 Td
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+(0445 __asm __volatile\("pushl %0; popfl" : : "r" \(eflags\)\);) 36.12 Tj
+0 -64.1454 Td
+(0446 }) 3.612 Tj
+0 -65.4545 Td
+(0447 ) 3.01 Tj
+0 -66.7636 Td
+(0448 ) 3.01 Tj
+0 -68.0727 Td
+(0449 ) 3.01 Tj
+0 -72 Td
+(Sheet 04) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/x86.h Page 3) 21.672 Tj
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+(0450 static __inline void) 15.05 Tj
+0 -5.23637 Td
+(0451 cpuid\(uint info, uint *eaxp, uint *ebxp, uint *ecxp, uint *edxp\)) 41.538 Tj
+0 -6.54546 Td
+(0452 {) 3.612 Tj
+0 -7.85455 Td
+(0453 uint eax, ebx, ecx, edx;) 18.662 Tj
+0 -9.16364 Td
+(0454 asm volatile\("cpuid" :) 17.458 Tj
+0 -10.4727 Td
+(0455 "=a" \(eax\), "=b" \(ebx\), "=c" \(ecx\), "=d" \(edx\) :) 40.936 Tj
+0 -11.7818 Td
+(0456 "a" \(info\)\);) 19.264 Tj
+0 -13.0909 Td
+(0457 if\(eaxp\)) 9.03 Tj
+0 -14.4 Td
+(0458 *eaxp = eax;) 12.642 Tj
+0 -15.7091 Td
+(0459 if\(ebxp\)) 9.03 Tj
+0 -17.0182 Td
+(0460 *ebxp = ebx;) 12.642 Tj
+0 -18.3273 Td
+(0461 if\(ecxp\)) 9.03 Tj
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+(0462 *ecxp = ecx;) 12.642 Tj
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+(0463 if\(edxp\)) 9.03 Tj
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+(0464 *edxp = edx;) 12.642 Tj
+0 -23.5636 Td
+(0465 }) 3.612 Tj
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+(0466 ) 3.01 Tj
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+0 -28.8 Td
+(0469 {) 3.612 Tj
+0 -30.1091 Td
+(0470 uint result;) 11.438 Tj
+0 -31.4182 Td
+(0471 __asm__ __volatile__\("lock; cmpxchgl %2, %0" :) 31.906 Tj
+0 -32.7273 Td
+(0472 "+m" \(*lock_addr\), "=a" \(result\) :) 37.324 Tj
+0 -34.0364 Td
+(0473 "r"\(newval\), "1"\(oldval\) :) 32.508 Tj
+0 -35.3454 Td
+(0474 "cc"\);) 20.468 Tj
+0 -36.6545 Td
+(0475 return result;) 12.642 Tj
+0 -37.9636 Td
+(0476 }) 3.612 Tj
+0 -39.2727 Td
+(0477 ) 3.01 Tj
+0 -40.5818 Td
+(0478 static __inline void) 15.05 Tj
+0 -41.8909 Td
+(0479 cli\(void\)) 8.428 Tj
+0 -43.2 Td
+(0480 {) 3.612 Tj
+0 -44.5091 Td
+(0481 __asm__ volatile\("cli"\);) 18.662 Tj
+0 -45.8182 Td
+(0482 }) 3.612 Tj
+0 -47.1272 Td
+(0483 ) 3.01 Tj
+0 -48.4363 Td
+(0484 static __inline void) 15.05 Tj
+0 -49.7454 Td
+(0485 sti\(void\)) 8.428 Tj
+0 -51.0545 Td
+(0486 {) 3.612 Tj
+0 -52.3636 Td
+(0487 __asm__ volatile\("sti"\);) 18.662 Tj
+0 -53.6727 Td
+(0488 }) 3.612 Tj
+0 -54.9818 Td
+(0489 ) 3.01 Tj
+0 -56.2909 Td
+(0490 ) 3.01 Tj
+0 -57.6 Td
+(0491 ) 3.01 Tj
+0 -58.9091 Td
+(0492 ) 3.01 Tj
+0 -60.2181 Td
+(0493 ) 3.01 Tj
+0 -61.5272 Td
+(0494 ) 3.01 Tj
+0 -62.8363 Td
+(0495 ) 3.01 Tj
+0 -64.1454 Td
+(0496 ) 3.01 Tj
+0 -65.4545 Td
+(0497 ) 3.01 Tj
+0 -66.7636 Td
+(0498 ) 3.01 Tj
+0 -68.0727 Td
+(0499 ) 3.01 Tj
+0 -72 Td
+(Sheet 04) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 12 12
+%%BeginPageSetup
+%%PageOrientation: Landscape
+__tumble pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/x86.h Page 4) 21.672 Tj
+0 -3.92728 Td
+(0500 // Layout of the trap frame on the stack upon entry to trap.) 39.13 Tj
+0 -5.23637 Td
+(0501 struct trapframe {) 13.846 Tj
+0 -6.54546 Td
+(0502 // registers as pushed by pusha) 22.876 Tj
+0 -7.85455 Td
+(0503 uint edi;) 9.632 Tj
+0 -9.16364 Td
+(0504 uint esi;) 9.632 Tj
+0 -10.4727 Td
+(0505 uint ebp;) 9.632 Tj
+0 -11.7818 Td
+(0506 uint oesp; // useless & ignored) 25.886 Tj
+0 -13.0909 Td
+(0507 uint ebx;) 9.632 Tj
+0 -14.4 Td
+(0508 uint edx;) 9.632 Tj
+0 -15.7091 Td
+(0509 uint ecx;) 9.632 Tj
+0 -17.0182 Td
+(0510 uint eax;) 9.632 Tj
+0 -18.3273 Td
+(0511 ) 3.01 Tj
+0 -19.6364 Td
+(0512 // rest of trap frame) 16.856 Tj
+0 -20.9455 Td
+(0513 ushort es;) 10.234 Tj
+0 -22.2545 Td
+(0514 ushort padding1;) 13.846 Tj
+0 -23.5636 Td
+(0515 ushort ds;) 10.234 Tj
+0 -24.8727 Td
+(0516 ushort padding2;) 13.846 Tj
+0 -26.1818 Td
+(0517 uint trapno;) 11.438 Tj
+0 -27.4909 Td
+(0518 ) 3.01 Tj
+0 -28.8 Td
+(0519 // below here defined by x86 hardware) 26.488 Tj
+0 -30.1091 Td
+(0520 uint err;) 9.632 Tj
+0 -31.4182 Td
+(0521 uint eip;) 9.632 Tj
+0 -32.7273 Td
+(0522 ushort cs;) 10.234 Tj
+0 -34.0364 Td
+(0523 ushort padding3;) 13.846 Tj
+0 -35.3454 Td
+(0524 uint eflags;) 11.438 Tj
+0 -36.6545 Td
+(0525 ) 3.01 Tj
+0 -37.9636 Td
+(0526 // below here only when crossing rings, such as from user to kernel) 44.548 Tj
+0 -39.2727 Td
+(0527 uint esp;) 9.632 Tj
+0 -40.5818 Td
+(0528 ushort ss;) 10.234 Tj
+0 -41.8909 Td
+(0529 ushort padding4;) 13.846 Tj
+0 -43.2 Td
+(0530 };) 4.214 Tj
+0 -44.5091 Td
+(0531 ) 3.01 Tj
+0 -45.8182 Td
+(0532 ) 3.01 Tj
+0 -47.1272 Td
+(0533 ) 3.01 Tj
+0 -48.4363 Td
+(0534 ) 3.01 Tj
+0 -49.7454 Td
+(0535 ) 3.01 Tj
+0 -51.0545 Td
+(0536 ) 3.01 Tj
+0 -52.3636 Td
+(0537 ) 3.01 Tj
+0 -53.6727 Td
+(0538 ) 3.01 Tj
+0 -54.9818 Td
+(0539 ) 3.01 Tj
+0 -56.2909 Td
+(0540 ) 3.01 Tj
+0 -57.6 Td
+(0541 ) 3.01 Tj
+0 -58.9091 Td
+(0542 ) 3.01 Tj
+0 -60.2181 Td
+(0543 ) 3.01 Tj
+0 -61.5272 Td
+(0544 ) 3.01 Tj
+0 -62.8363 Td
+(0545 ) 3.01 Tj
+0 -64.1454 Td
+(0546 ) 3.01 Tj
+0 -65.4545 Td
+(0547 ) 3.01 Tj
+0 -66.7636 Td
+(0548 ) 3.01 Tj
+0 -68.0727 Td
+(0549 ) 3.01 Tj
+0 -72 Td
+(Sheet 05) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/asm.h Page 1) 21.672 Tj
+0 -3.92728 Td
+(0550 //) 4.214 Tj
+0 -5.23637 Td
+(0551 // macros to create x86 segments from assembler) 31.304 Tj
+0 -6.54546 Td
+(0552 //) 4.214 Tj
+0 -7.85455 Td
+(0553 ) 3.01 Tj
+0 -9.16364 Td
+(0554 #define SEG_NULLASM \\) 42.14 Tj
+0 -10.4727 Td
+(0555 .word 0, 0; \\) 42.14 Tj
+0 -11.7818 Td
+(0556 .byte 0, 0, 0, 0) 17.458 Tj
+0 -13.0909 Td
+(0557 ) 3.01 Tj
+0 -14.4 Td
+(0558 #define SEG_ASM\(type,base,lim\) \\) 42.14 Tj
+0 -15.7091 Td
+(0559 .word \(\(\(lim\) >> 12\) & 0xffff\), \(\(base\) & 0xffff\); \\) 42.14 Tj
+0 -17.0182 Td
+(0560 .byte \(\(\(base\) >> 16\) & 0xff\), \(0x90 | \(type\)\), \\) 42.14 Tj
+0 -18.3273 Td
+(0561 \(0xC0 | \(\(\(lim\) >> 28\) & 0xf\)\), \(\(\(base\) >> 24\) & 0xff\)) 45.752 Tj
+0 -19.6364 Td
+(0562 ) 3.01 Tj
+0 -20.9455 Td
+(0563 #define STA_X 0x8 // Executable segment) 32.508 Tj
+0 -22.2545 Td
+(0564 #define STA_E 0x4 // Expand down \(non-executable segments\)) 43.946 Tj
+0 -23.5636 Td
+(0565 #define STA_C 0x4 // Conforming code segment \(executable only\)) 46.354 Tj
+0 -24.8727 Td
+(0566 #define STA_W 0x2 // Writeable \(non-executable segments\)) 42.742 Tj
+0 -26.1818 Td
+(0567 #define STA_R 0x2 // Readable \(executable segments\)) 39.732 Tj
+0 -27.4909 Td
+(0568 #define STA_A 0x1 // Accessed) 26.488 Tj
+0 -28.8 Td
+(0569 ) 3.01 Tj
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+(0570 ) 3.01 Tj
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+(0571 ) 3.01 Tj
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+(0574 ) 3.01 Tj
+0 -36.6545 Td
+(0575 ) 3.01 Tj
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+(0576 ) 3.01 Tj
+0 -39.2727 Td
+(0577 ) 3.01 Tj
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+(0578 ) 3.01 Tj
+0 -41.8909 Td
+(0579 ) 3.01 Tj
+0 -43.2 Td
+(0580 ) 3.01 Tj
+0 -44.5091 Td
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+0 -45.8182 Td
+(0582 ) 3.01 Tj
+0 -47.1272 Td
+(0583 ) 3.01 Tj
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+(0587 ) 3.01 Tj
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+(0588 ) 3.01 Tj
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+(0590 ) 3.01 Tj
+0 -57.6 Td
+(0591 ) 3.01 Tj
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+(0592 ) 3.01 Tj
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+(0593 ) 3.01 Tj
+0 -61.5272 Td
+(0594 ) 3.01 Tj
+0 -62.8363 Td
+(0595 ) 3.01 Tj
+0 -64.1454 Td
+(0596 ) 3.01 Tj
+0 -65.4545 Td
+(0597 ) 3.01 Tj
+0 -66.7636 Td
+(0598 ) 3.01 Tj
+0 -68.0727 Td
+(0599 ) 3.01 Tj
+0 -72 Td
+(Sheet 05) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 13 13
+%%BeginPageSetup
+%%PageOrientation: Landscape
+pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/mmu.h Page 1) 21.672 Tj
+0 -3.92728 Td
+(0600 // This file contains definitions for the) 27.692 Tj
+0 -5.23637 Td
+(0601 // x86 memory management unit \(MMU\).) 24.682 Tj
+0 -6.54546 Td
+(0602 ) 3.01 Tj
+0 -7.85455 Td
+(0603 // Eflags register) 13.846 Tj
+0 -9.16364 Td
+(0604 #define FL_CF 0x00000001 // Carry Flag) 34.916 Tj
+0 -10.4727 Td
+(0605 #define FL_PF 0x00000004 // Parity Flag) 35.518 Tj
+0 -11.7818 Td
+(0606 #define FL_AF 0x00000010 // Auxiliary carry Flag) 40.936 Tj
+0 -13.0909 Td
+(0607 #define FL_ZF 0x00000040 // Zero Flag) 34.314 Tj
+0 -14.4 Td
+(0608 #define FL_SF 0x00000080 // Sign Flag) 34.314 Tj
+0 -15.7091 Td
+(0609 #define FL_TF 0x00000100 // Trap Flag) 34.314 Tj
+0 -17.0182 Td
+(0610 #define FL_IF 0x00000200 // Interrupt Enable) 38.528 Tj
+0 -18.3273 Td
+(0611 #define FL_DF 0x00000400 // Direction Flag) 37.324 Tj
+0 -19.6364 Td
+(0612 #define FL_OF 0x00000800 // Overflow Flag) 36.722 Tj
+0 -20.9455 Td
+(0613 #define FL_IOPL_MASK 0x00003000 // I/O Privilege Level bitmask) 45.15 Tj
+0 -22.2545 Td
+(0614 #define FL_IOPL_0 0x00000000 // IOPL == 0) 35.518 Tj
+0 -23.5636 Td
+(0615 #define FL_IOPL_1 0x00001000 // IOPL == 1) 35.518 Tj
+0 -24.8727 Td
+(0616 #define FL_IOPL_2 0x00002000 // IOPL == 2) 35.518 Tj
+0 -26.1818 Td
+(0617 #define FL_IOPL_3 0x00003000 // IOPL == 3) 35.518 Tj
+0 -27.4909 Td
+(0618 #define FL_NT 0x00004000 // Nested Task) 35.518 Tj
+0 -28.8 Td
+(0619 #define FL_RF 0x00010000 // Resume Flag) 35.518 Tj
+0 -30.1091 Td
+(0620 #define FL_VM 0x00020000 // Virtual 8086 mode) 39.13 Tj
+0 -31.4182 Td
+(0621 #define FL_AC 0x00040000 // Alignment Check) 37.926 Tj
+0 -32.7273 Td
+(0622 #define FL_VIF 0x00080000 // Virtual Interrupt Flag) 42.14 Tj
+0 -34.0364 Td
+(0623 #define FL_VIP 0x00100000 // Virtual Interrupt Pending) 43.946 Tj
+0 -35.3454 Td
+(0624 #define FL_ID 0x00200000 // ID flag) 33.11 Tj
+0 -36.6545 Td
+(0625 ) 3.01 Tj
+0 -37.9636 Td
+(0626 // Segment Descriptor) 15.652 Tj
+0 -39.2727 Td
+(0627 struct segdesc {) 12.642 Tj
+0 -40.5818 Td
+(0628 uint lim_15_0 : 16; // Low bits of segment limit) 33.712 Tj
+0 -41.8909 Td
+(0629 uint base_15_0 : 16; // Low bits of segment base address) 37.926 Tj
+0 -43.2 Td
+(0630 uint base_23_16 : 8; // Middle bits of segment base address) 39.732 Tj
+0 -44.5091 Td
+(0631 uint type : 4; // Segment type \(see STS_ constants\)) 38.528 Tj
+0 -45.8182 Td
+(0632 uint s : 1; // 0 = system, 1 = application) 34.916 Tj
+0 -47.1272 Td
+(0633 uint dpl : 2; // Descriptor Privilege Level) 34.314 Tj
+0 -48.4363 Td
+(0634 uint p : 1; // Present) 22.876 Tj
+0 -49.7454 Td
+(0635 uint lim_19_16 : 4; // High bits of segment limit) 34.314 Tj
+0 -51.0545 Td
+(0636 uint avl : 1; // Unused \(available for software use\)) 39.732 Tj
+0 -52.3636 Td
+(0637 uint rsv1 : 1; // Reserved) 23.478 Tj
+0 -53.6727 Td
+(0638 uint db : 1; // 0 = 16-bit segment, 1 = 32-bit segment) 41.538 Tj
+0 -54.9818 Td
+(0639 uint g : 1; // Granularity: limit scaled by 4K when set) 42.742 Tj
+0 -56.2909 Td
+(0640 uint base_31_24 : 8; // High bits of segment base address) 38.528 Tj
+0 -57.6 Td
+(0641 };) 4.214 Tj
+0 -58.9091 Td
+(0642 ) 3.01 Tj
+0 -60.2181 Td
+(0643 ) 3.01 Tj
+0 -61.5272 Td
+(0644 ) 3.01 Tj
+0 -62.8363 Td
+(0645 ) 3.01 Tj
+0 -64.1454 Td
+(0646 ) 3.01 Tj
+0 -65.4545 Td
+(0647 ) 3.01 Tj
+0 -66.7636 Td
+(0648 ) 3.01 Tj
+0 -68.0727 Td
+(0649 ) 3.01 Tj
+0 -72 Td
+(Sheet 06) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/mmu.h Page 2) 21.672 Tj
+0 -3.92728 Td
+(0650 // Null segment) 12.04 Tj
+0 -5.23637 Td
+(0651 #define SEG_NULL \(struct segdesc\){ 0,0,0,0,0,0,0,0,0,0,0,0,0 }) 44.548 Tj
+0 -6.54546 Td
+(0652 ) 3.01 Tj
+0 -7.85455 Td
+(0653 // Normal segment) 13.244 Tj
+0 -9.16364 Td
+(0654 #define SEG\(type, base, lim, dpl\) \(struct segdesc\) \\) 46.956 Tj
+0 -10.4727 Td
+(0655 { \(\(lim\) >> 12\) & 0xffff, \(base\) & 0xffff, \(\(base\) >> 16\) & 0xff, \\) 46.956 Tj
+0 -11.7818 Td
+(0656 type, 1, dpl, 1, \(uint\) \(lim\) >> 28, 0, 0, 1, 1, \\) 42.14 Tj
+0 -13.0909 Td
+(0657 \(uint\) \(base\) >> 24 }) 18.06 Tj
+0 -14.4 Td
+(0658 ) 3.01 Tj
+0 -15.7091 Td
+(0659 #define SEG16\(type, base, lim, dpl\) \(struct segdesc\) \\) 46.956 Tj
+0 -17.0182 Td
+(0660 { \(lim\) & 0xffff, \(base\) & 0xffff, \(\(base\) >> 16\) & 0xff, \\) 46.956 Tj
+0 -18.3273 Td
+(0661 type, 1, dpl, 1, \(uint\) \(lim\) >> 16, 0, 0, 1, 0, \\) 42.14 Tj
+0 -19.6364 Td
+(0662 \(uint\) \(base\) >> 24 }) 18.06 Tj
+0 -20.9455 Td
+(0663 ) 3.01 Tj
+0 -22.2545 Td
+(0664 // Application segment type bits) 22.274 Tj
+0 -23.5636 Td
+(0665 #define STA_X 0x8 // Executable segment) 32.508 Tj
+0 -24.8727 Td
+(0666 #define STA_E 0x4 // Expand down \(non-executable segments\)) 43.946 Tj
+0 -26.1818 Td
+(0667 #define STA_C 0x4 // Conforming code segment \(executable only\)) 46.354 Tj
+0 -27.4909 Td
+(0668 #define STA_W 0x2 // Writeable \(non-executable segments\)) 42.742 Tj
+0 -28.8 Td
+(0669 #define STA_R 0x2 // Readable \(executable segments\)) 39.732 Tj
+0 -30.1091 Td
+(0670 #define STA_A 0x1 // Accessed) 26.488 Tj
+0 -31.4182 Td
+(0671 ) 3.01 Tj
+0 -32.7273 Td
+(0672 // System segment type bits) 19.264 Tj
+0 -34.0364 Td
+(0673 #define STS_T16A 0x1 // Available 16-bit TSS) 33.712 Tj
+0 -35.3454 Td
+(0674 #define STS_LDT 0x2 // Local Descriptor Table) 34.916 Tj
+0 -36.6545 Td
+(0675 #define STS_T16B 0x3 // Busy 16-bit TSS) 30.702 Tj
+0 -37.9636 Td
+(0676 #define STS_CG16 0x4 // 16-bit Call Gate) 31.304 Tj
+0 -39.2727 Td
+(0677 #define STS_TG 0x5 // Task Gate / Coum Transmitions) 39.13 Tj
+0 -40.5818 Td
+(0678 #define STS_IG16 0x6 // 16-bit Interrupt Gate) 34.314 Tj
+0 -41.8909 Td
+(0679 #define STS_TG16 0x7 // 16-bit Trap Gate) 31.304 Tj
+0 -43.2 Td
+(0680 #define STS_T32A 0x9 // Available 32-bit TSS) 33.712 Tj
+0 -44.5091 Td
+(0681 #define STS_T32B 0xB // Busy 32-bit TSS) 30.702 Tj
+0 -45.8182 Td
+(0682 #define STS_CG32 0xC // 32-bit Call Gate) 31.304 Tj
+0 -47.1272 Td
+(0683 #define STS_IG32 0xE // 32-bit Interrupt Gate) 34.314 Tj
+0 -48.4363 Td
+(0684 #define STS_TG32 0xF // 32-bit Trap Gate) 31.304 Tj
+0 -49.7454 Td
+(0685 ) 3.01 Tj
+0 -51.0545 Td
+(0686 // Task state segment format) 19.866 Tj
+0 -52.3636 Td
+(0687 struct taskstate {) 13.846 Tj
+0 -53.6727 Td
+(0688 uint link; // Old ts selector) 24.682 Tj
+0 -54.9818 Td
+(0689 uint esp0; // Stack pointers and segment selectors) 37.324 Tj
+0 -56.2909 Td
+(0690 ushort ss0; // after an increase in privilege level) 38.528 Tj
+0 -57.6 Td
+(0691 ushort padding1;) 13.846 Tj
+0 -58.9091 Td
+(0692 uint *esp1;) 10.836 Tj
+0 -60.2181 Td
+(0693 ushort ss1;) 10.836 Tj
+0 -61.5272 Td
+(0694 ushort padding2;) 13.846 Tj
+0 -62.8363 Td
+(0695 uint *esp2;) 10.836 Tj
+0 -64.1454 Td
+(0696 ushort ss2;) 10.836 Tj
+0 -65.4545 Td
+(0697 ushort padding3;) 13.846 Tj
+0 -66.7636 Td
+(0698 void *cr3; // Page directory base) 26.488 Tj
+0 -68.0727 Td
+(0699 uint *eip; // Saved state from last task switch) 34.916 Tj
+0 -72 Td
+(Sheet 06) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 14 14
+%%BeginPageSetup
+%%PageOrientation: Landscape
+__tumble pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
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+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/mmu.h Page 3) 21.672 Tj
+0 -3.92728 Td
+(0700 uint eflags;) 11.438 Tj
+0 -5.23637 Td
+(0701 uint eax; // More saved state \(registers\)) 32.508 Tj
+0 -6.54546 Td
+(0702 uint ecx;) 9.632 Tj
+0 -7.85455 Td
+(0703 uint edx;) 9.632 Tj
+0 -9.16364 Td
+(0704 uint ebx;) 9.632 Tj
+0 -10.4727 Td
+(0705 uint *esp;) 10.234 Tj
+0 -11.7818 Td
+(0706 uint *ebp;) 10.234 Tj
+0 -13.0909 Td
+(0707 uint esi;) 9.632 Tj
+0 -14.4 Td
+(0708 uint edi;) 9.632 Tj
+0 -15.7091 Td
+(0709 ushort es; // Even more saved state \(segment selectors\)) 45.15 Tj
+0 -17.0182 Td
+(0710 ushort padding4;) 13.846 Tj
+0 -18.3273 Td
+(0711 ushort cs;) 10.234 Tj
+0 -19.6364 Td
+(0712 ushort padding5;) 13.846 Tj
+0 -20.9455 Td
+(0713 ushort ss;) 10.234 Tj
+0 -22.2545 Td
+(0714 ushort padding6;) 13.846 Tj
+0 -23.5636 Td
+(0715 ushort ds;) 10.234 Tj
+0 -24.8727 Td
+(0716 ushort padding7;) 13.846 Tj
+0 -26.1818 Td
+(0717 ushort fs;) 10.234 Tj
+0 -27.4909 Td
+(0718 ushort padding8;) 13.846 Tj
+0 -28.8 Td
+(0719 ushort gs;) 10.234 Tj
+0 -30.1091 Td
+(0720 ushort padding9;) 13.846 Tj
+0 -31.4182 Td
+(0721 ushort ldt;) 10.836 Tj
+0 -32.7273 Td
+(0722 ushort padding10;) 14.448 Tj
+0 -34.0364 Td
+(0723 ushort t; // Trap on task switch) 31.906 Tj
+0 -35.3454 Td
+(0724 ushort iomb; // I/O map base address) 27.692 Tj
+0 -36.6545 Td
+(0725 };) 4.214 Tj
+0 -37.9636 Td
+(0726 ) 3.01 Tj
+0 -39.2727 Td
+(0727 // Gate descriptors for interrupts and traps) 29.498 Tj
+0 -40.5818 Td
+(0728 struct gatedesc {) 13.244 Tj
+0 -41.8909 Td
+(0729 uint off_15_0 : 16; // low 16 bits of offset in segment) 38.528 Tj
+0 -43.2 Td
+(0730 uint ss : 16; // segment selector) 28.896 Tj
+0 -44.5091 Td
+(0731 uint args : 5; // # args, 0 for interrupt/trap gates) 39.732 Tj
+0 -45.8182 Td
+(0732 uint rsv1 : 3; // reserved\(should be zero I guess\)) 38.528 Tj
+0 -47.1272 Td
+(0733 uint type : 4; // type\(STS_{TG,IG32,TG32}\)) 33.712 Tj
+0 -48.4363 Td
+(0734 uint s : 1; // must be 0 \(system\)) 30.1 Tj
+0 -49.7454 Td
+(0735 uint dpl : 2; // descriptor\(meaning new\) privilege level) 42.742 Tj
+0 -51.0545 Td
+(0736 uint p : 1; // Present) 23.478 Tj
+0 -52.3636 Td
+(0737 uint off_31_16 : 16; // high bits of offset in segment) 37.324 Tj
+0 -53.6727 Td
+(0738 };) 4.214 Tj
+0 -54.9818 Td
+(0739 ) 3.01 Tj
+0 -56.2909 Td
+(0740 ) 3.01 Tj
+0 -57.6 Td
+(0741 ) 3.01 Tj
+0 -58.9091 Td
+(0742 ) 3.01 Tj
+0 -60.2181 Td
+(0743 ) 3.01 Tj
+0 -61.5272 Td
+(0744 ) 3.01 Tj
+0 -62.8363 Td
+(0745 ) 3.01 Tj
+0 -64.1454 Td
+(0746 ) 3.01 Tj
+0 -65.4545 Td
+(0747 ) 3.01 Tj
+0 -66.7636 Td
+(0748 ) 3.01 Tj
+0 -68.0727 Td
+(0749 ) 3.01 Tj
+0 -72 Td
+(Sheet 07) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/mmu.h Page 4) 21.672 Tj
+0 -3.92728 Td
+(0750 // Set up a normal interrupt/trap gate descriptor.) 33.11 Tj
+0 -5.23637 Td
+(0751 // - istrap: 1 for a trap \(= exception\) gate, 0 for an interrupt gate.) 45.15 Tj
+0 -6.54546 Td
+(0752 // interrupt gate clears FL_IF, trap gate leaves FL_IF alone) 40.334 Tj
+0 -7.85455 Td
+(0753 // - sel: Code segment selector for interrupt/trap handler) 37.926 Tj
+0 -9.16364 Td
+(0754 // - off: Offset in code segment for interrupt/trap handler) 38.528 Tj
+0 -10.4727 Td
+(0755 // - dpl: Descriptor Privilege Level -) 25.886 Tj
+0 -11.7818 Td
+(0756 // the privilege level required for software to invoke) 39.732 Tj
+0 -13.0909 Td
+(0757 // this interrupt/trap gate explicitly using an int instruction.) 45.752 Tj
+0 -14.4 Td
+(0758 #define SETGATE\(gate, istrap, sel, off, d\) \\) 42.14 Tj
+0 -15.7091 Td
+(0759 { \\) 42.14 Tj
+0 -17.0182 Td
+(0760 \(gate\).off_15_0 = \(uint\) \(off\) & 0xffff; \\) 38.528 Tj
+0 -18.3273 Td
+(0761 \(gate\).ss = \(sel\); \\) 38.528 Tj
+0 -19.6364 Td
+(0762 \(gate\).args = 0; \\) 38.528 Tj
+0 -20.9455 Td
+(0763 \(gate\).rsv1 = 0; \\) 38.528 Tj
+0 -22.2545 Td
+(0764 \(gate\).type = \(istrap\) ? STS_TG32 : STS_IG32; \\) 33.712 Tj
+0 -23.5636 Td
+(0765 \(gate\).s = 0; \\) 33.712 Tj
+0 -24.8727 Td
+(0766 \(gate\).dpl = \(d\); \\) 38.528 Tj
+0 -26.1818 Td
+(0767 \(gate\).p = 1; \\) 33.712 Tj
+0 -27.4909 Td
+(0768 \(gate\).off_31_16 = \(uint\) \(off\) >> 16; \\) 33.712 Tj
+0 -28.8 Td
+(0769 }) 3.612 Tj
+0 -30.1091 Td
+(0770 ) 3.01 Tj
+0 -31.4182 Td
+(0771 ) 3.01 Tj
+0 -32.7273 Td
+(0772 ) 3.01 Tj
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+(0773 ) 3.01 Tj
+0 -35.3454 Td
+(0774 ) 3.01 Tj
+0 -36.6545 Td
+(0775 ) 3.01 Tj
+0 -37.9636 Td
+(0776 ) 3.01 Tj
+0 -39.2727 Td
+(0777 ) 3.01 Tj
+0 -40.5818 Td
+(0778 ) 3.01 Tj
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+(0779 ) 3.01 Tj
+0 -43.2 Td
+(0780 ) 3.01 Tj
+0 -44.5091 Td
+(0781 ) 3.01 Tj
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+(0782 ) 3.01 Tj
+0 -47.1272 Td
+(0783 ) 3.01 Tj
+0 -48.4363 Td
+(0784 ) 3.01 Tj
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+(0785 ) 3.01 Tj
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+(0786 ) 3.01 Tj
+0 -52.3636 Td
+(0787 ) 3.01 Tj
+0 -53.6727 Td
+(0788 ) 3.01 Tj
+0 -54.9818 Td
+(0789 ) 3.01 Tj
+0 -56.2909 Td
+(0790 ) 3.01 Tj
+0 -57.6 Td
+(0791 ) 3.01 Tj
+0 -58.9091 Td
+(0792 ) 3.01 Tj
+0 -60.2181 Td
+(0793 ) 3.01 Tj
+0 -61.5272 Td
+(0794 ) 3.01 Tj
+0 -62.8363 Td
+(0795 ) 3.01 Tj
+0 -64.1454 Td
+(0796 ) 3.01 Tj
+0 -65.4545 Td
+(0797 ) 3.01 Tj
+0 -66.7636 Td
+(0798 ) 3.01 Tj
+0 -68.0727 Td
+(0799 ) 3.01 Tj
+0 -72 Td
+(Sheet 07) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 15 15
+%%BeginPageSetup
+%%PageOrientation: Landscape
+pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
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+10 M
+1 w
+0 g
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+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
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+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/elf.h Page 1) 21.672 Tj
+0 -3.92728 Td
+(0800 // Format of an ELF executable file) 24.08 Tj
+0 -5.23637 Td
+(0801 ) 3.01 Tj
+0 -6.54546 Td
+(0802 #define ELF_MAGIC 0x464C457FU // "\\x7FELF" in little endian) 39.13 Tj
+0 -7.85455 Td
+(0803 ) 3.01 Tj
+0 -9.16364 Td
+(0804 // File header) 11.438 Tj
+0 -10.4727 Td
+(0805 struct elfhdr {) 12.04 Tj
+0 -11.7818 Td
+(0806 uint magic; // must equal ELF_MAGIC) 25.886 Tj
+0 -13.0909 Td
+(0807 uchar elf[12];) 12.642 Tj
+0 -14.4 Td
+(0808 ushort type;) 11.438 Tj
+0 -15.7091 Td
+(0809 ushort machine;) 13.244 Tj
+0 -17.0182 Td
+(0810 uint version;) 12.04 Tj
+0 -18.3273 Td
+(0811 uint entry;) 10.836 Tj
+0 -19.6364 Td
+(0812 uint phoff;) 10.836 Tj
+0 -20.9455 Td
+(0813 uint shoff;) 10.836 Tj
+0 -22.2545 Td
+(0814 uint flags;) 10.836 Tj
+0 -23.5636 Td
+(0815 ushort ehsize;) 12.642 Tj
+0 -24.8727 Td
+(0816 ushort phentsize;) 14.448 Tj
+0 -26.1818 Td
+(0817 ushort phnum;) 12.04 Tj
+0 -27.4909 Td
+(0818 ushort shentsize;) 14.448 Tj
+0 -28.8 Td
+(0819 ushort shnum;) 12.04 Tj
+0 -30.1091 Td
+(0820 ushort shstrndx;) 13.846 Tj
+0 -31.4182 Td
+(0821 };) 4.214 Tj
+0 -32.7273 Td
+(0822 ) 3.01 Tj
+0 -34.0364 Td
+(0823 // Program section header) 18.06 Tj
+0 -35.3454 Td
+(0824 struct proghdr {) 12.642 Tj
+0 -36.6545 Td
+(0825 uint type;) 10.234 Tj
+0 -37.9636 Td
+(0826 uint offset;) 11.438 Tj
+0 -39.2727 Td
+(0827 uint va;) 9.03 Tj
+0 -40.5818 Td
+(0828 uint pa;) 9.03 Tj
+0 -41.8909 Td
+(0829 uint filesz;) 11.438 Tj
+0 -43.2 Td
+(0830 uint memsz;) 10.836 Tj
+0 -44.5091 Td
+(0831 uint flags;) 10.836 Tj
+0 -45.8182 Td
+(0832 uint align;) 10.836 Tj
+0 -47.1272 Td
+(0833 };) 4.214 Tj
+0 -48.4363 Td
+(0834 ) 3.01 Tj
+0 -49.7454 Td
+(0835 // Values for Proghdr type) 18.662 Tj
+0 -51.0545 Td
+(0836 #define ELF_PROG_LOAD 1) 22.876 Tj
+0 -52.3636 Td
+(0837 ) 3.01 Tj
+0 -53.6727 Td
+(0838 // Flag bits for Proghdr flags) 21.07 Tj
+0 -54.9818 Td
+(0839 #define ELF_PROG_FLAG_EXEC 1) 22.876 Tj
+0 -56.2909 Td
+(0840 #define ELF_PROG_FLAG_WRITE 2) 22.876 Tj
+0 -57.6 Td
+(0841 #define ELF_PROG_FLAG_READ 4) 22.876 Tj
+0 -58.9091 Td
+(0842 ) 3.01 Tj
+0 -60.2181 Td
+(0843 ) 3.01 Tj
+0 -61.5272 Td
+(0844 ) 3.01 Tj
+0 -62.8363 Td
+(0845 ) 3.01 Tj
+0 -64.1454 Td
+(0846 ) 3.01 Tj
+0 -65.4545 Td
+(0847 ) 3.01 Tj
+0 -66.7636 Td
+(0848 ) 3.01 Tj
+0 -68.0727 Td
+(0849 ) 3.01 Tj
+0 -72 Td
+(Sheet 08) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/mp.h Page 1) 21.07 Tj
+0 -3.92728 Td
+(0850 // See MultiProcessor Specification Version 1.[14].) 33.712 Tj
+0 -5.23637 Td
+(0851 ) 3.01 Tj
+0 -6.54546 Td
+(0852 struct mp { // floating pointer) 28.896 Tj
+0 -7.85455 Td
+(0853 uchar signature[4]; // "_MP_") 27.692 Tj
+0 -9.16364 Td
+(0854 void *physaddr; // phys addr of MP config table) 40.936 Tj
+0 -10.4727 Td
+(0855 uchar length; // 1) 24.682 Tj
+0 -11.7818 Td
+(0856 uchar specrev; // [14]) 26.488 Tj
+0 -13.0909 Td
+(0857 uchar checksum; // all bytes must add up to 0) 39.732 Tj
+0 -14.4 Td
+(0858 uchar type; // MP system config type) 36.722 Tj
+0 -15.7091 Td
+(0859 uchar imcrp;) 11.438 Tj
+0 -17.0182 Td
+(0860 uchar reserved[3];) 15.05 Tj
+0 -18.3273 Td
+(0861 };) 4.214 Tj
+0 -19.6364 Td
+(0862 ) 3.01 Tj
+0 -20.9455 Td
+(0863 struct mpctb { // configuration table header) 34.916 Tj
+0 -22.2545 Td
+(0864 uchar signature[4]; // "PCMP") 27.692 Tj
+0 -23.5636 Td
+(0865 ushort length; // total table length) 34.916 Tj
+0 -24.8727 Td
+(0866 uchar version; // [14]) 26.488 Tj
+0 -26.1818 Td
+(0867 uchar checksum; // all bytes must add up to 0) 39.732 Tj
+0 -27.4909 Td
+(0868 uchar product[20]; // product id) 30.1 Tj
+0 -28.8 Td
+(0869 uint *oemtable; // OEM table pointer) 34.314 Tj
+0 -30.1091 Td
+(0870 ushort oemlength; // OEM table length) 33.712 Tj
+0 -31.4182 Td
+(0871 ushort entry; // entry count) 30.702 Tj
+0 -32.7273 Td
+(0872 uint *lapicaddr; // address of local APIC) 36.722 Tj
+0 -34.0364 Td
+(0873 ushort xlength; // extended table length) 36.722 Tj
+0 -35.3454 Td
+(0874 uchar xchecksum; // extended table checksum) 37.926 Tj
+0 -36.6545 Td
+(0875 uchar reserved;) 13.244 Tj
+0 -37.9636 Td
+(0876 };) 4.214 Tj
+0 -39.2727 Td
+(0877 ) 3.01 Tj
+0 -40.5818 Td
+(0878 struct mppe { // processor table entry) 31.906 Tj
+0 -41.8909 Td
+(0879 uchar type; // entry type \(0\)) 32.508 Tj
+0 -43.2 Td
+(0880 uchar apicid; // local APIC id) 31.906 Tj
+0 -44.5091 Td
+(0881 uchar version; // local APIC verison) 34.916 Tj
+0 -45.8182 Td
+(0882 uchar flags; // CPU flags) 29.498 Tj
+0 -47.1272 Td
+(0883 uchar signature[4]; // CPU signature) 31.906 Tj
+0 -48.4363 Td
+(0884 uint feature; // feature flags from CPUID instruction) 45.752 Tj
+0 -49.7454 Td
+(0885 uchar reserved[8];) 15.05 Tj
+0 -51.0545 Td
+(0886 };) 4.214 Tj
+0 -52.3636 Td
+(0887 ) 3.01 Tj
+0 -53.6727 Td
+(0888 struct mpbe { // bus table entry) 28.294 Tj
+0 -54.9818 Td
+(0889 uchar type; // entry type \(1\)) 32.508 Tj
+0 -56.2909 Td
+(0890 uchar busno; // bus id) 27.692 Tj
+0 -57.6 Td
+(0891 char string[6]; // bus type string) 33.11 Tj
+0 -58.9091 Td
+(0892 };) 4.214 Tj
+0 -60.2181 Td
+(0893 ) 3.01 Tj
+0 -61.5272 Td
+(0894 ) 3.01 Tj
+0 -62.8363 Td
+(0895 ) 3.01 Tj
+0 -64.1454 Td
+(0896 ) 3.01 Tj
+0 -65.4545 Td
+(0897 ) 3.01 Tj
+0 -66.7636 Td
+(0898 ) 3.01 Tj
+0 -68.0727 Td
+(0899 ) 3.01 Tj
+0 -72 Td
+(Sheet 08) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 16 16
+%%BeginPageSetup
+%%PageOrientation: Landscape
+__tumble pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/mp.h Page 2) 21.07 Tj
+0 -3.92728 Td
+(0900 struct mpioapic { // I/O APIC table entry) 31.304 Tj
+0 -5.23637 Td
+(0901 uchar type; // entry type \(2\)) 32.508 Tj
+0 -6.54546 Td
+(0902 uchar apicno; // I/O APIC id) 30.702 Tj
+0 -7.85455 Td
+(0903 uchar version; // I/O APIC version) 33.712 Tj
+0 -9.16364 Td
+(0904 uchar flags; // I/O APIC flags) 32.508 Tj
+0 -10.4727 Td
+(0905 uint *addr; // I/O APIC address) 33.11 Tj
+0 -11.7818 Td
+(0906 };) 4.214 Tj
+0 -13.0909 Td
+(0907 ) 3.01 Tj
+0 -14.4 Td
+(0908 struct mpie { // interrupt table entry) 31.906 Tj
+0 -15.7091 Td
+(0909 uchar type; // entry type \([34]\)) 34.314 Tj
+0 -17.0182 Td
+(0910 uchar intr; // interrupt type) 32.508 Tj
+0 -18.3273 Td
+(0911 ushort flags; // interrupt flag) 32.508 Tj
+0 -19.6364 Td
+(0912 uchar busno; // source bus id) 31.906 Tj
+0 -20.9455 Td
+(0913 uchar irq; // source bus irq) 32.508 Tj
+0 -22.2545 Td
+(0914 uchar apicno; // destination APIC id) 35.518 Tj
+0 -23.5636 Td
+(0915 uchar intin; // destination APIC [L]INTIN#) 39.732 Tj
+0 -24.8727 Td
+(0916 };) 4.214 Tj
+0 -26.1818 Td
+(0917 ) 3.01 Tj
+0 -27.4909 Td
+(0918 enum { // table entry types) 29.498 Tj
+0 -28.8 Td
+(0919 MPPROCESSOR = 0x00, // one entry per processor) 37.926 Tj
+0 -30.1091 Td
+(0920 MPBUS = 0x01, // one entry per bus) 34.314 Tj
+0 -31.4182 Td
+(0921 MPIOAPIC = 0x02, // one entry per I/O APIC) 37.324 Tj
+0 -32.7273 Td
+(0922 MPIOINTR = 0x03, // one entry per bus interrupt source) 44.548 Tj
+0 -34.0364 Td
+(0923 MPLINTR = 0x04, // one entry per system interrupt source) 46.354 Tj
+0 -35.3454 Td
+(0924 ) 3.01 Tj
+0 -36.6545 Td
+(0925 MPSASM = 0x80,) 12.642 Tj
+0 -37.9636 Td
+(0926 MPHIERARCHY = 0x81,) 16.856 Tj
+0 -39.2727 Td
+(0927 MPCBASM = 0x82,) 13.244 Tj
+0 -40.5818 Td
+(0928 ) 3.01 Tj
+0 -41.8909 Td
+(0929 // PCMPprocessor and PCMPioapic flags) 39.732 Tj
+0 -43.2 Td
+(0930 MPEN = 0x01, // enabled) 28.294 Tj
+0 -44.5091 Td
+(0931 MPBP = 0x02, // bootstrap processor) 35.518 Tj
+0 -45.8182 Td
+(0932 ) 3.01 Tj
+0 -47.1272 Td
+(0933 // PCMPiointr and PCMPlintr flags) 37.324 Tj
+0 -48.4363 Td
+(0934 MPPOMASK = 0x03, // polarity conforms to bus specs) 42.14 Tj
+0 -49.7454 Td
+(0935 MPHIGH = 0x01, // active high) 30.702 Tj
+0 -51.0545 Td
+(0936 MPLOW = 0x03, // active low) 30.1 Tj
+0 -52.3636 Td
+(0937 MPELMASK = 0x0C, // trigger mode of APIC input signals) 44.548 Tj
+0 -53.6727 Td
+(0938 MPEDGE = 0x04, // edge-triggered) 32.508 Tj
+0 -54.9818 Td
+(0939 MPLEVEL = 0x0C, // level-triggered) 33.11 Tj
+0 -56.2909 Td
+(0940 ) 3.01 Tj
+0 -57.6 Td
+(0941 // PCMPiointr and PCMPlintr interrupt type) 42.742 Tj
+0 -58.9091 Td
+(0942 MPINT = 0x00, // vectored interrupt from APIC Rdt) 43.344 Tj
+0 -60.2181 Td
+(0943 MPNMI = 0x01, // non-maskable interrupt) 37.324 Tj
+0 -61.5272 Td
+(0944 MPSMI = 0x02, // system management interrupt) 40.334 Tj
+0 -62.8363 Td
+(0945 MPExtINT = 0x03, // vectored interrupt from external PIC) 45.752 Tj
+0 -64.1454 Td
+(0946 };) 4.214 Tj
+0 -65.4545 Td
+(0947 ) 3.01 Tj
+0 -66.7636 Td
+(0948 ) 3.01 Tj
+0 -68.0727 Td
+(0949 ) 3.01 Tj
+0 -72 Td
+(Sheet 09) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/mp.h Page 3) 21.07 Tj
+0 -3.92728 Td
+(0950 // Common bits for) 13.846 Tj
+0 -5.23637 Td
+(0951 // I/O APIC Redirection Table Entry;) 27.692 Tj
+0 -6.54546 Td
+(0952 // Local APIC Local Interrupt Vector Table;) 31.906 Tj
+0 -7.85455 Td
+(0953 // Local APIC Inter-Processor Interrupt;) 30.1 Tj
+0 -9.16364 Td
+(0954 // Local APIC Timer Vector Table.) 25.886 Tj
+0 -10.4727 Td
+(0955 enum {) 6.622 Tj
+0 -11.7818 Td
+(0956 APIC_FIXED = 0x00000000, // [10:8] Delivery Mode) 36.12 Tj
+0 -13.0909 Td
+(0957 APIC_LOWEST = 0x00000100, // Lowest priority) 33.11 Tj
+0 -14.4 Td
+(0958 APIC_SMI = 0x00000200, // System Management Interrupt) 40.334 Tj
+0 -15.7091 Td
+(0959 APIC_RR = 0x00000300, // Remote Read) 30.702 Tj
+0 -17.0182 Td
+(0960 APIC_NMI = 0x00000400,) 21.07 Tj
+0 -18.3273 Td
+(0961 APIC_INIT = 0x00000500, // INIT/RESET) 30.1 Tj
+0 -19.6364 Td
+(0962 APIC_STARTUP = 0x00000600, // Startup IPI) 30.702 Tj
+0 -20.9455 Td
+(0963 APIC_EXTINT = 0x00000700,) 21.07 Tj
+0 -22.2545 Td
+(0964 ) 3.01 Tj
+0 -23.5636 Td
+(0965 APIC_PHYSICAL = 0x00000000, // [11] Destination Mode \(RW\)) 39.732 Tj
+0 -24.8727 Td
+(0966 APIC_LOGICAL = 0x00000800,) 21.07 Tj
+0 -26.1818 Td
+(0967 ) 3.01 Tj
+0 -27.4909 Td
+(0968 APIC_DELIVS = 0x00001000, // [12] Delivery Status \(RO\)) 39.13 Tj
+0 -28.8 Td
+(0969 APIC_HIGH = 0x00000000, // [13] Interrupt Input Pin Polarity \(RW\)) 46.956 Tj
+0 -30.1091 Td
+(0970 APIC_LOW = 0x00002000,) 21.07 Tj
+0 -31.4182 Td
+(0971 APIC_REMOTEIRR = 0x00004000, // [14] Remote IRR \(RO\)) 36.12 Tj
+0 -32.7273 Td
+(0972 APIC_EDGE = 0x00000000, // [15] Trigger Mode \(RW\)) 37.324 Tj
+0 -34.0364 Td
+(0973 APIC_LEVEL = 0x00008000,) 21.07 Tj
+0 -35.3454 Td
+(0974 APIC_IMASK = 0x00010000, // [16] Interrupt Mask) 35.518 Tj
+0 -36.6545 Td
+(0975 };) 4.214 Tj
+0 -37.9636 Td
+(0976 ) 3.01 Tj
+0 -39.2727 Td
+(0977 ) 3.01 Tj
+0 -40.5818 Td
+(0978 ) 3.01 Tj
+0 -41.8909 Td
+(0979 ) 3.01 Tj
+0 -43.2 Td
+(0980 ) 3.01 Tj
+0 -44.5091 Td
+(0981 ) 3.01 Tj
+0 -45.8182 Td
+(0982 ) 3.01 Tj
+0 -47.1272 Td
+(0983 ) 3.01 Tj
+0 -48.4363 Td
+(0984 ) 3.01 Tj
+0 -49.7454 Td
+(0985 ) 3.01 Tj
+0 -51.0545 Td
+(0986 ) 3.01 Tj
+0 -52.3636 Td
+(0987 ) 3.01 Tj
+0 -53.6727 Td
+(0988 ) 3.01 Tj
+0 -54.9818 Td
+(0989 ) 3.01 Tj
+0 -56.2909 Td
+(0990 ) 3.01 Tj
+0 -57.6 Td
+(0991 ) 3.01 Tj
+0 -58.9091 Td
+(0992 ) 3.01 Tj
+0 -60.2181 Td
+(0993 ) 3.01 Tj
+0 -61.5272 Td
+(0994 ) 3.01 Tj
+0 -62.8363 Td
+(0995 ) 3.01 Tj
+0 -64.1454 Td
+(0996 ) 3.01 Tj
+0 -65.4545 Td
+(0997 ) 3.01 Tj
+0 -66.7636 Td
+(0998 ) 3.01 Tj
+0 -68.0727 Td
+(0999 ) 3.01 Tj
+0 -72 Td
+(Sheet 09) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 17 17
+%%BeginPageSetup
+%%PageOrientation: Landscape
+pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/bootasm.S Page 1) 24.08 Tj
+0 -3.92728 Td
+(1000 #include "asm.h") 12.642 Tj
+0 -5.23637 Td
+(1001 ) 3.01 Tj
+0 -6.54546 Td
+(1002 .set PROT_MODE_CSEG,0x8 # code segment selector) 36.12 Tj
+0 -7.85455 Td
+(1003 .set PROT_MODE_DSEG,0x10 # data segment selector) 36.12 Tj
+0 -9.16364 Td
+(1004 .set CR0_PE_ON,0x1 # protected mode enable flag) 39.13 Tj
+0 -10.4727 Td
+(1005 ) 3.01 Tj
+0 -11.7818 Td
+(1006 #########################################################################) 46.956 Tj
+0 -13.0909 Td
+(1007 # ENTRY POINT for the bootstrap processor) 27.692 Tj
+0 -14.4 Td
+(1008 # This code should be stored in the first sector of the hard disk.) 43.946 Tj
+0 -15.7091 Td
+(1009 # After the BIOS initializes the hardware on startup or system reset,) 45.752 Tj
+0 -17.0182 Td
+(1010 # it loads this code at physical address 0x7c00 - 0x7d00 \(512 bytes\).) 45.752 Tj
+0 -18.3273 Td
+(1011 # Then the BIOS jumps to the beginning of it, address 0x7c00,) 40.936 Tj
+0 -19.6364 Td
+(1012 # while running in 16-bit real-mode \(8086 compatibility mode\).) 41.538 Tj
+0 -20.9455 Td
+(1013 # The Code Segment register \(CS\) is initially zero on entry.) 40.334 Tj
+0 -22.2545 Td
+(1014 #) 3.612 Tj
+0 -23.5636 Td
+(1015 # This code switches into 32-bit protected mode so that all of) 40.334 Tj
+0 -24.8727 Td
+(1016 # memory can accessed, then calls into C.) 27.692 Tj
+0 -26.1818 Td
+(1017 #########################################################################) 46.956 Tj
+0 -27.4909 Td
+(1018 ) 3.01 Tj
+0 -28.8 Td
+(1019 .globl start # Entry point) 31.304 Tj
+0 -30.1091 Td
+(1020 start:) 6.622 Tj
+0 -31.4182 Td
+(1021 .code16 # This runs in real mode) 37.926 Tj
+0 -32.7273 Td
+(1022 cli # Disable interrupts) 35.518 Tj
+0 -34.0364 Td
+(1023 cld # String operations increment) 40.936 Tj
+0 -35.3454 Td
+(1024 ) 3.01 Tj
+0 -36.6545 Td
+(1025 # Set up the important data segment registers \(DS, ES, SS\).) 39.732 Tj
+0 -37.9636 Td
+(1026 xorw %ax,%ax # Segment number zero) 36.12 Tj
+0 -39.2727 Td
+(1027 movw %ax,%ds # -> Data Segment) 33.712 Tj
+0 -40.5818 Td
+(1028 movw %ax,%es # -> Extra Segment) 34.314 Tj
+0 -41.8909 Td
+(1029 movw %ax,%ss # -> Stack Segment) 34.314 Tj
+0 -43.2 Td
+(1030 ) 3.01 Tj
+0 -44.5091 Td
+(1031 # Set up the stack pointer, growing downward from 0x7c00.) 38.528 Tj
+0 -45.8182 Td
+(1032 movw $start,%sp # Stack Pointer) 32.508 Tj
+0 -47.1272 Td
+(1033 ) 3.01 Tj
+0 -48.4363 Td
+(1034 # Enable A20:) 12.04 Tj
+0 -49.7454 Td
+(1035 # For fascinating historical reasons \(related to the fact that) 42.742 Tj
+0 -51.0545 Td
+(1036 # the earliest 8086-based PCs could only address 1MB of physical) 43.946 Tj
+0 -52.3636 Td
+(1037 # memory and subsequent 80286-based PCs wanted to retain maximum) 43.946 Tj
+0 -53.6727 Td
+(1038 # compatibility\), physical address line 20 is tied to low when the) 45.15 Tj
+0 -54.9818 Td
+(1039 # machine boots. Obviously this a bit of a drag for us, especially) 45.752 Tj
+0 -56.2909 Td
+(1040 # when trying to address memory above 1MB. This code undoes this.) 45.15 Tj
+0 -57.6 Td
+(1041 ) 3.01 Tj
+0 -58.9091 Td
+(1042 seta20.1:) 8.428 Tj
+0 -60.2181 Td
+(1043 inb $0x64,%al # Get status) 30.702 Tj
+0 -61.5272 Td
+(1044 testb $0x2,%al # Busy?) 27.692 Tj
+0 -62.8363 Td
+(1045 jnz seta20.1 # Yes) 26.488 Tj
+0 -64.1454 Td
+(1046 movb $0xd1,%al # Command: Write) 33.11 Tj
+0 -65.4545 Td
+(1047 outb %al,$0x64 # output port) 31.906 Tj
+0 -66.7636 Td
+(1048 ) 3.01 Tj
+0 -68.0727 Td
+(1049 ) 3.01 Tj
+0 -72 Td
+(Sheet 10) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/bootasm.S Page 2) 24.08 Tj
+0 -3.92728 Td
+(1050 seta20.2:) 8.428 Tj
+0 -5.23637 Td
+(1051 inb $0x64,%al # Get status) 30.702 Tj
+0 -6.54546 Td
+(1052 testb $0x2,%al # Busy?) 27.692 Tj
+0 -7.85455 Td
+(1053 jnz seta20.2 # Yes) 26.488 Tj
+0 -9.16364 Td
+(1054 movb $0xdf,%al # Enable) 28.294 Tj
+0 -10.4727 Td
+(1055 outb %al,$0x60 # A20) 27.09 Tj
+0 -11.7818 Td
+(1056 ) 3.01 Tj
+0 -13.0909 Td
+(1057 # Switch from real to protected mode) 24.682 Tj
+0 -14.4 Td
+(1058 # The descriptors in our GDT allow all physical memory to be accessed.) 45.752 Tj
+0 -15.7091 Td
+(1059 # Furthermore, the descriptors have base addresses of 0, so that the) 44.548 Tj
+0 -17.0182 Td
+(1060 # segment translation is a NOP, ie. virtual addresses are identical to) 45.752 Tj
+0 -18.3273 Td
+(1061 # their physical addresses. With this setup, immediately after) 41.538 Tj
+0 -19.6364 Td
+(1062 # enabling protected mode it will still appear to this code) 39.13 Tj
+0 -20.9455 Td
+(1063 # that it is running directly on physical memory with no translation.) 45.15 Tj
+0 -22.2545 Td
+(1064 # This initial NOP-translation setup is required by the processor) 42.742 Tj
+0 -23.5636 Td
+(1065 # to ensure that the transition to protected mode occurs smoothly.) 43.344 Tj
+0 -24.8727 Td
+(1066 real_to_prot:) 10.836 Tj
+0 -26.1818 Td
+(1067 cli # Mandatory since we dont set up an IDT) 44.548 Tj
+0 -27.4909 Td
+(1068 lgdt gdtdesc # load GDT -- mandatory in protected mode) 45.752 Tj
+0 -28.8 Td
+(1069 movl %cr0, %eax # turn on protected mode) 35.518 Tj
+0 -30.1091 Td
+(1070 orl $CR0_PE_ON, %eax #) 21.672 Tj
+0 -31.4182 Td
+(1071 movl %eax, %cr0 #) 21.672 Tj
+0 -32.7273 Td
+(1072 ### CPU magic: jump to relocation, flush prefetch queue, and reload %cs) 46.956 Tj
+0 -34.0364 Td
+(1073 ### Has the effect of just jmp to the next instruction, but simultaneous) 47.558 Tj
+0 -35.3454 Td
+(1074 ### loads CS with $PROT_MODE_CSEG.) 24.682 Tj
+0 -36.6545 Td
+(1075 ljmp $PROT_MODE_CSEG, $protcseg) 24.682 Tj
+0 -37.9636 Td
+(1076 ) 3.01 Tj
+0 -39.2727 Td
+(1077 #### we are in 32-bit protected mode \(hence the .code32\)) 36.722 Tj
+0 -40.5818 Td
+(1078 .code32) 7.224 Tj
+0 -41.8909 Td
+(1079 protcseg:) 8.428 Tj
+0 -43.2 Td
+(1080 # Set up the protected-mode data segment registers) 34.314 Tj
+0 -44.5091 Td
+(1081 movw $PROT_MODE_DSEG, %ax # Our data segment selector) 39.732 Tj
+0 -45.8182 Td
+(1082 movw %ax, %ds # -> DS: Data Segment) 36.12 Tj
+0 -47.1272 Td
+(1083 movw %ax, %es # -> ES: Extra Segment) 36.722 Tj
+0 -48.4363 Td
+(1084 movw %ax, %fs # -> FS) 27.692 Tj
+0 -49.7454 Td
+(1085 movw %ax, %gs # -> GS) 27.692 Tj
+0 -51.0545 Td
+(1086 movw %ax, %ss # -> SS: Stack Segment) 36.722 Tj
+0 -52.3636 Td
+(1087 call cmain # finish the boot load from C.) 41.538 Tj
+0 -53.6727 Td
+(1088 # cmain\(\) should not return) 39.732 Tj
+0 -54.9818 Td
+(1089 spin:) 6.02 Tj
+0 -56.2909 Td
+(1090 jmp spin # ..but in case it does, spin) 40.936 Tj
+0 -57.6 Td
+(1091 ) 3.01 Tj
+0 -58.9091 Td
+(1092 .p2align 2 # force 4 byte alignment) 42.742 Tj
+0 -60.2181 Td
+(1093 gdt:) 5.418 Tj
+0 -61.5272 Td
+(1094 SEG_NULLASM # null seg) 34.314 Tj
+0 -62.8363 Td
+(1095 SEG_ASM\(STA_X|STA_R, 0x0, 0xffffffff\) # code seg) 34.314 Tj
+0 -64.1454 Td
+(1096 SEG_ASM\(STA_W, 0x0, 0xffffffff\) # data seg) 34.314 Tj
+0 -65.4545 Td
+(1097 gdtdesc:) 7.826 Tj
+0 -66.7636 Td
+(1098 .word 0x17 # sizeof\(gdt\) - 1) 38.528 Tj
+0 -68.0727 Td
+(1099 .long gdt # address gdt) 36.12 Tj
+0 -72 Td
+(Sheet 10) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 18 18
+%%BeginPageSetup
+%%PageOrientation: Landscape
+__tumble pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/bootother.S Page 1) 25.284 Tj
+0 -3.92728 Td
+(1100 #include "asm.h") 12.642 Tj
+0 -5.23637 Td
+(1101 ) 3.01 Tj
+0 -6.54546 Td
+(1102 # Start an Application Processor. This must be placed on a 4KB boundary) 45.752 Tj
+0 -7.85455 Td
+(1103 # somewhere in the 1st MB of conventional memory \(APBOOTSTRAP\). However,) 46.354 Tj
+0 -9.16364 Td
+(1104 # due to some shortcuts below it's restricted further to within the 1st) 45.752 Tj
+0 -10.4727 Td
+(1105 # 64KB. The AP starts in real-mode, with) 27.09 Tj
+0 -11.7818 Td
+(1106 # CS selector set to the startup memory address/16;) 34.916 Tj
+0 -13.0909 Td
+(1107 # CS base set to startup memory address;) 28.294 Tj
+0 -14.4 Td
+(1108 # CS limit set to 64KB;) 18.06 Tj
+0 -15.7091 Td
+(1109 # CPL and IP set to 0.) 17.458 Tj
+0 -17.0182 Td
+(1110 #) 3.612 Tj
+0 -18.3273 Td
+(1111 # mp.c causes each non-boot CPU in turn to jump to start.) 37.324 Tj
+0 -19.6364 Td
+(1112 # mp.c puts the correct %esp in start-4, and the place to jump) 40.334 Tj
+0 -20.9455 Td
+(1113 # to in start-8.) 12.642 Tj
+0 -22.2545 Td
+(1114 ) 3.01 Tj
+0 -23.5636 Td
+(1115 .set PROT_MODE_CSEG,0x8 # code segment selector) 36.12 Tj
+0 -24.8727 Td
+(1116 .set PROT_MODE_DSEG,0x10 # data segment selector) 36.12 Tj
+0 -26.1818 Td
+(1117 .set CR0_PE_ON,0x1 # protected mode enable flag) 39.13 Tj
+0 -27.4909 Td
+(1118 ) 3.01 Tj
+0 -28.8 Td
+(1119 .globl start) 10.234 Tj
+0 -30.1091 Td
+(1120 start:) 6.622 Tj
+0 -31.4182 Td
+(1121 .code16 # This runs in real mode) 35.518 Tj
+0 -32.7273 Td
+(1122 cli # Disable interrupts) 33.11 Tj
+0 -34.0364 Td
+(1123 cld # String operations increment) 38.528 Tj
+0 -35.3454 Td
+(1124 ) 3.01 Tj
+0 -36.6545 Td
+(1125 # Set up the important data segment registers \(DS, ES, SS\).) 39.732 Tj
+0 -37.9636 Td
+(1126 xorw %ax,%ax # Segment number zero) 33.712 Tj
+0 -39.2727 Td
+(1127 movw %ax,%ds # -> Data Segment) 31.304 Tj
+0 -40.5818 Td
+(1128 movw %ax,%es # -> Extra Segment) 31.906 Tj
+0 -41.8909 Td
+(1129 movw %ax,%ss # -> Stack Segment) 31.906 Tj
+0 -43.2 Td
+(1130 ) 3.01 Tj
+0 -44.5091 Td
+(1131 # Set up the stack pointer, growing downward from 0x7000-8.) 39.732 Tj
+0 -45.8182 Td
+(1132 movw $start-8,%sp # Stack Pointer) 30.1 Tj
+0 -47.1272 Td
+(1133 ) 3.01 Tj
+0 -48.4363 Td
+(1134 # Switch from real to protected mode) 25.886 Tj
+0 -49.7454 Td
+(1135 # The descriptors in our GDT allow all physical memory to be accessed.) 46.956 Tj
+0 -51.0545 Td
+(1136 # Furthermore, the descriptors have base addresses of 0, so that the) 45.752 Tj
+0 -52.3636 Td
+(1137 # segment translation is a NOP, ie. virtual addresses are identical to) 46.956 Tj
+0 -53.6727 Td
+(1138 # their physical addresses. With this setup, immediately after) 42.742 Tj
+0 -54.9818 Td
+(1139 # enabling protected mode it will still appear to this code) 40.334 Tj
+0 -56.2909 Td
+(1140 # that it is running directly on physical memory with no translation.) 46.354 Tj
+0 -57.6 Td
+(1141 # This initial NOP-translation setup is required by the processor) 43.946 Tj
+0 -58.9091 Td
+(1142 # to ensure that the transition to protected mode occurs smoothly.) 44.548 Tj
+0 -60.2181 Td
+(1143 ) 3.01 Tj
+0 -61.5272 Td
+(1144 lgdt gdtdesc # load GDT -- mandatory in protected mode) 45.752 Tj
+0 -62.8363 Td
+(1145 movl %cr0, %eax # turn on protected mode) 35.518 Tj
+0 -64.1454 Td
+(1146 orl $CR0_PE_ON, %eax #) 21.672 Tj
+0 -65.4545 Td
+(1147 movl %eax, %cr0 #) 21.672 Tj
+0 -66.7636 Td
+(1148 ) 3.01 Tj
+0 -68.0727 Td
+(1149 ) 3.01 Tj
+0 -72 Td
+(Sheet 11) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/bootother.S Page 2) 25.284 Tj
+0 -3.92728 Td
+(1150 # CPU magic: jump to relocation, flush prefetch queue, and reload %cs) 45.752 Tj
+0 -5.23637 Td
+(1151 # Has the effect of just jmp to the next instruction, but simultaneous) 46.354 Tj
+0 -6.54546 Td
+(1152 # loads CS with $PROT_MODE_CSEG.) 23.478 Tj
+0 -7.85455 Td
+(1153 ljmp $PROT_MODE_CSEG, $protcseg) 24.682 Tj
+0 -9.16364 Td
+(1154 ) 3.01 Tj
+0 -10.4727 Td
+(1155 # We are now in 32-bit protected mode \(hence the .code32\)) 37.324 Tj
+0 -11.7818 Td
+(1156 .code32) 7.224 Tj
+0 -13.0909 Td
+(1157 protcseg:) 8.428 Tj
+0 -14.4 Td
+(1158 # Set up the protected-mode data segment registers) 34.314 Tj
+0 -15.7091 Td
+(1159 movw $PROT_MODE_DSEG, %ax # Our data segment selector) 39.732 Tj
+0 -17.0182 Td
+(1160 movw %ax, %ds # -> DS: Data Segment) 36.12 Tj
+0 -18.3273 Td
+(1161 movw %ax, %es # -> ES: Extra Segment) 36.722 Tj
+0 -19.6364 Td
+(1162 movw %ax, %fs # -> FS) 27.692 Tj
+0 -20.9455 Td
+(1163 movw %ax, %gs # -> GS) 27.692 Tj
+0 -22.2545 Td
+(1164 movw %ax, %ss # -> SS: Stack Segment) 36.722 Tj
+0 -23.5636 Td
+(1165 ) 3.01 Tj
+0 -24.8727 Td
+(1166 movl start-8, %eax) 16.856 Tj
+0 -26.1818 Td
+(1167 movl start-4, %esp) 16.856 Tj
+0 -27.4909 Td
+(1168 jmp *%eax) 12.04 Tj
+0 -28.8 Td
+(1169 ) 3.01 Tj
+0 -30.1091 Td
+(1170 .p2align 2 # force 4 byte alignment) 42.742 Tj
+0 -31.4182 Td
+(1171 gdt:) 5.418 Tj
+0 -32.7273 Td
+(1172 SEG_NULLASM # null seg) 34.314 Tj
+0 -34.0364 Td
+(1173 SEG_ASM\(STA_X|STA_R, 0x0, 0xffffffff\) # code seg) 34.314 Tj
+0 -35.3454 Td
+(1174 SEG_ASM\(STA_W, 0x0, 0xffffffff\) # data seg) 34.314 Tj
+0 -36.6545 Td
+(1175 ) 3.01 Tj
+0 -37.9636 Td
+(1176 gdtdesc:) 7.826 Tj
+0 -39.2727 Td
+(1177 .word 0x17 # sizeof\(gdt\) - 1) 38.528 Tj
+0 -40.5818 Td
+(1178 .long gdt # address gdt) 36.12 Tj
+0 -41.8909 Td
+(1179 ) 3.01 Tj
+0 -43.2 Td
+(1180 ) 3.01 Tj
+0 -44.5091 Td
+(1181 ) 3.01 Tj
+0 -45.8182 Td
+(1182 ) 3.01 Tj
+0 -47.1272 Td
+(1183 ) 3.01 Tj
+0 -48.4363 Td
+(1184 ) 3.01 Tj
+0 -49.7454 Td
+(1185 ) 3.01 Tj
+0 -51.0545 Td
+(1186 ) 3.01 Tj
+0 -52.3636 Td
+(1187 ) 3.01 Tj
+0 -53.6727 Td
+(1188 ) 3.01 Tj
+0 -54.9818 Td
+(1189 ) 3.01 Tj
+0 -56.2909 Td
+(1190 ) 3.01 Tj
+0 -57.6 Td
+(1191 ) 3.01 Tj
+0 -58.9091 Td
+(1192 ) 3.01 Tj
+0 -60.2181 Td
+(1193 ) 3.01 Tj
+0 -61.5272 Td
+(1194 ) 3.01 Tj
+0 -62.8363 Td
+(1195 ) 3.01 Tj
+0 -64.1454 Td
+(1196 ) 3.01 Tj
+0 -65.4545 Td
+(1197 ) 3.01 Tj
+0 -66.7636 Td
+(1198 ) 3.01 Tj
+0 -68.0727 Td
+(1199 ) 3.01 Tj
+0 -72 Td
+(Sheet 11) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 19 19
+%%BeginPageSetup
+%%PageOrientation: Landscape
+pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/main.c Page 1) 22.274 Tj
+0 -3.92728 Td
+(1200 #include "types.h") 13.846 Tj
+0 -5.23637 Td
+(1201 #include "param.h") 13.846 Tj
+0 -6.54546 Td
+(1202 #include "mmu.h") 12.642 Tj
+0 -7.85455 Td
+(1203 #include "proc.h") 13.244 Tj
+0 -9.16364 Td
+(1204 #include "defs.h") 13.244 Tj
+0 -10.4727 Td
+(1205 #include "x86.h") 12.642 Tj
+0 -11.7818 Td
+(1206 #include "traps.h") 13.846 Tj
+0 -13.0909 Td
+(1207 #include "syscall.h") 15.05 Tj
+0 -14.4 Td
+(1208 #include "elf.h") 12.642 Tj
+0 -15.7091 Td
+(1209 #include "param.h") 13.846 Tj
+0 -17.0182 Td
+(1210 #include "spinlock.h") 15.652 Tj
+0 -18.3273 Td
+(1211 ) 3.01 Tj
+0 -19.6364 Td
+(1212 extern char edata[], end[];) 19.264 Tj
+0 -20.9455 Td
+(1213 extern uchar _binary__init_start[], _binary__init_size[];) 37.324 Tj
+0 -22.2545 Td
+(1214 ) 3.01 Tj
+0 -23.5636 Td
+(1215 void process0\(\);) 12.642 Tj
+0 -24.8727 Td
+(1216 ) 3.01 Tj
+0 -26.1818 Td
+(1217 // Bootstrap processor starts running C code here.) 33.11 Tj
+0 -27.4909 Td
+(1218 // This is called main0 not main so that it can have) 34.314 Tj
+0 -28.8 Td
+(1219 // a void return type. Gcc can't handle functions named) 36.722 Tj
+0 -30.1091 Td
+(1220 // main that don't return int. Really.) 26.488 Tj
+0 -31.4182 Td
+(1221 void) 5.418 Tj
+0 -32.7273 Td
+(1222 main0\(void\)) 9.632 Tj
+0 -34.0364 Td
+(1223 {) 3.612 Tj
+0 -35.3454 Td
+(1224 int i;) 7.826 Tj
+0 -36.6545 Td
+(1225 int bcpu;) 9.632 Tj
+0 -37.9636 Td
+(1226 struct proc *p;) 13.244 Tj
+0 -39.2727 Td
+(1227 ) 3.01 Tj
+0 -40.5818 Td
+(1228 // clear BSS) 11.438 Tj
+0 -41.8909 Td
+(1229 memset\(edata, 0, end - edata\);) 22.274 Tj
+0 -43.2 Td
+(1230 ) 3.01 Tj
+0 -44.5091 Td
+(1231 // Prevent release\(\) from enabling interrupts.) 31.906 Tj
+0 -45.8182 Td
+(1232 for\(i=0; i<NCPU; i++\)) 16.856 Tj
+0 -47.1272 Td
+(1233 cpus[i].nlock = 1;) 16.254 Tj
+0 -48.4363 Td
+(1234 ) 3.01 Tj
+0 -49.7454 Td
+(1235 mp_init\(\); // collect info about this machine) 31.304 Tj
+0 -51.0545 Td
+(1236 bcpu = mp_bcpu\(\);) 14.448 Tj
+0 -52.3636 Td
+(1237 ) 3.01 Tj
+0 -53.6727 Td
+(1238 // switch to bootstrap processor's stack) 28.294 Tj
+0 -54.9818 Td
+(1239 asm volatile\("movl %0, %%esp" : : "r" \(cpus[0].mpstack + MPSTACK - 32\)\);) 47.558 Tj
+0 -56.2909 Td
+(1240 asm volatile\("movl %0, %%ebp" : : "r" \(cpus[0].mpstack + MPSTACK\)\);) 44.548 Tj
+0 -57.6 Td
+(1241 ) 3.01 Tj
+0 -58.9091 Td
+(1242 lapic_init\(bcpu\);) 14.448 Tj
+0 -60.2181 Td
+(1243 ) 3.01 Tj
+0 -61.5272 Td
+(1244 cprintf\("\\ncpu%d: starting xv6\\n\\n", cpu\(\)\);) 30.702 Tj
+0 -62.8363 Td
+(1245 ) 3.01 Tj
+0 -64.1454 Td
+(1246 ) 3.01 Tj
+0 -65.4545 Td
+(1247 ) 3.01 Tj
+0 -66.7636 Td
+(1248 ) 3.01 Tj
+0 -68.0727 Td
+(1249 ) 3.01 Tj
+0 -72 Td
+(Sheet 12) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/main.c Page 2) 22.274 Tj
+0 -3.92728 Td
+(1250 pinit\(\); // process table) 19.264 Tj
+0 -5.23637 Td
+(1251 binit\(\); // buffer cache) 18.662 Tj
+0 -6.54546 Td
+(1252 pic_init\(\);) 10.836 Tj
+0 -7.85455 Td
+(1253 ioapic_init\(\);) 12.642 Tj
+0 -9.16364 Td
+(1254 kinit\(\); // physical memory allocator) 26.488 Tj
+0 -10.4727 Td
+(1255 tvinit\(\); // trap vectors) 19.264 Tj
+0 -11.7818 Td
+(1256 idtinit\(\); // this CPU's interrupt descriptor table) 34.916 Tj
+0 -13.0909 Td
+(1257 fileinit\(\);) 10.836 Tj
+0 -14.4 Td
+(1258 iinit\(\); // i-node table) 18.662 Tj
+0 -15.7091 Td
+(1259 ) 3.01 Tj
+0 -17.0182 Td
+(1260 // initialize process 0) 18.06 Tj
+0 -18.3273 Td
+(1261 p = &proc[0];) 12.04 Tj
+0 -19.6364 Td
+(1262 p->state = RUNNABLE;) 16.254 Tj
+0 -20.9455 Td
+(1263 p->kstack = kalloc\(KSTACKSIZE\);) 22.876 Tj
+0 -22.2545 Td
+(1264 ) 3.01 Tj
+0 -23.5636 Td
+(1265 // cause proc[0] to start in kernel at process0) 32.508 Tj
+0 -24.8727 Td
+(1266 p->jmpbuf.eip = \(uint\) process0;) 23.478 Tj
+0 -26.1818 Td
+(1267 p->jmpbuf.esp = \(uint\) \(p->kstack + KSTACKSIZE - 4\);) 35.518 Tj
+0 -27.4909 Td
+(1268 ) 3.01 Tj
+0 -28.8 Td
+(1269 // make sure there's a TSS) 19.866 Tj
+0 -30.1091 Td
+(1270 setupsegs\(0\);) 12.04 Tj
+0 -31.4182 Td
+(1271 ) 3.01 Tj
+0 -32.7273 Td
+(1272 // initialize I/O devices, let them enable interrupts) 36.12 Tj
+0 -34.0364 Td
+(1273 console_init\(\);) 13.244 Tj
+0 -35.3454 Td
+(1274 ide_init\(\);) 10.836 Tj
+0 -36.6545 Td
+(1275 ) 3.01 Tj
+0 -37.9636 Td
+(1276 // start other CPUs) 15.652 Tj
+0 -39.2727 Td
+(1277 mp_startthem\(\);) 13.244 Tj
+0 -40.5818 Td
+(1278 ) 3.01 Tj
+0 -41.8909 Td
+(1279 // turn on timer) 13.846 Tj
+0 -43.2 Td
+(1280 if\(ismp\)) 9.03 Tj
+0 -44.5091 Td
+(1281 lapic_timerinit\(\);) 16.254 Tj
+0 -45.8182 Td
+(1282 else) 6.622 Tj
+0 -47.1272 Td
+(1283 pit8253_timerinit\(\);) 17.458 Tj
+0 -48.4363 Td
+(1284 ) 3.01 Tj
+0 -49.7454 Td
+(1285 // enable interrupts on the local APIC) 27.09 Tj
+0 -51.0545 Td
+(1286 lapic_enableintr\(\);) 15.652 Tj
+0 -52.3636 Td
+(1287 ) 3.01 Tj
+0 -53.6727 Td
+(1288 // enable interrupts on this processor.) 27.692 Tj
+0 -54.9818 Td
+(1289 cpus[cpu\(\)].nlock--;) 16.254 Tj
+0 -56.2909 Td
+(1290 sti\(\);) 7.826 Tj
+0 -57.6 Td
+(1291 ) 3.01 Tj
+0 -58.9091 Td
+(1292 scheduler\(\);) 11.438 Tj
+0 -60.2181 Td
+(1293 }) 3.612 Tj
+0 -61.5272 Td
+(1294 ) 3.01 Tj
+0 -62.8363 Td
+(1295 ) 3.01 Tj
+0 -64.1454 Td
+(1296 ) 3.01 Tj
+0 -65.4545 Td
+(1297 ) 3.01 Tj
+0 -66.7636 Td
+(1298 ) 3.01 Tj
+0 -68.0727 Td
+(1299 ) 3.01 Tj
+0 -72 Td
+(Sheet 12) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 20 20
+%%BeginPageSetup
+%%PageOrientation: Landscape
+__tumble pdfStartPage
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+[] 0 d
+1 i
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+10 M
+1 w
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+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
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+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/main.c Page 3) 22.274 Tj
+0 -3.92728 Td
+(1300 // Additional processors start here.) 24.682 Tj
+0 -5.23637 Td
+(1301 void) 5.418 Tj
+0 -6.54546 Td
+(1302 mpmain\(void\)) 10.234 Tj
+0 -7.85455 Td
+(1303 {) 3.612 Tj
+0 -9.16364 Td
+(1304 cprintf\("cpu%d: starting\\n", cpu\(\)\);) 25.886 Tj
+0 -10.4727 Td
+(1305 idtinit\(\); // CPU's idt) 18.06 Tj
+0 -11.7818 Td
+(1306 if\(cpu\(\) == 0\)) 12.642 Tj
+0 -13.0909 Td
+(1307 panic\("mpmain on cpu 0"\);) 20.468 Tj
+0 -14.4 Td
+(1308 lapic_init\(cpu\(\)\);) 15.05 Tj
+0 -15.7091 Td
+(1309 lapic_timerinit\(\);) 15.05 Tj
+0 -17.0182 Td
+(1310 lapic_enableintr\(\);) 15.652 Tj
+0 -18.3273 Td
+(1311 ) 3.01 Tj
+0 -19.6364 Td
+(1312 // make sure there's a TSS) 19.866 Tj
+0 -20.9455 Td
+(1313 setupsegs\(0\);) 12.04 Tj
+0 -22.2545 Td
+(1314 ) 3.01 Tj
+0 -23.5636 Td
+(1315 cpuid\(0, 0, 0, 0, 0\); // memory barrier) 28.294 Tj
+0 -24.8727 Td
+(1316 cpus[cpu\(\)].booted = 1;) 18.06 Tj
+0 -26.1818 Td
+(1317 ) 3.01 Tj
+0 -27.4909 Td
+(1318 // Enable interrupts on this processor.) 27.692 Tj
+0 -28.8 Td
+(1319 cpus[cpu\(\)].nlock--;) 16.254 Tj
+0 -30.1091 Td
+(1320 sti\(\);) 7.826 Tj
+0 -31.4182 Td
+(1321 ) 3.01 Tj
+0 -32.7273 Td
+(1322 scheduler\(\);) 11.438 Tj
+0 -34.0364 Td
+(1323 }) 3.612 Tj
+0 -35.3454 Td
+(1324 ) 3.01 Tj
+0 -36.6545 Td
+(1325 // proc[0] starts here, called by scheduler\(\) in the ordinary way.) 42.742 Tj
+0 -37.9636 Td
+(1326 void) 5.418 Tj
+0 -39.2727 Td
+(1327 process0\(\)) 9.03 Tj
+0 -40.5818 Td
+(1328 {) 3.612 Tj
+0 -41.8909 Td
+(1329 struct proc *p0 = &proc[0];) 20.468 Tj
+0 -43.2 Td
+(1330 struct proc *p1;) 13.846 Tj
+0 -44.5091 Td
+(1331 extern struct spinlock proc_table_lock;) 27.692 Tj
+0 -45.8182 Td
+(1332 struct trapframe tf;) 16.254 Tj
+0 -47.1272 Td
+(1333 ) 3.01 Tj
+0 -48.4363 Td
+(1334 release\(&proc_table_lock\);) 19.866 Tj
+0 -49.7454 Td
+(1335 ) 3.01 Tj
+0 -51.0545 Td
+(1336 p0->cwd = iget\(rootdev, 1\);) 20.468 Tj
+0 -52.3636 Td
+(1337 iunlock\(p0->cwd\);) 14.448 Tj
+0 -53.6727 Td
+(1338 ) 3.01 Tj
+0 -54.9818 Td
+(1339 // dummy user memory to make copyproc\(\) happy.) 31.906 Tj
+0 -56.2909 Td
+(1340 // must be big enough to hold the init binary.) 31.906 Tj
+0 -57.6 Td
+(1341 p0->sz = PAGE;) 12.642 Tj
+0 -58.9091 Td
+(1342 p0->mem = kalloc\(p0->sz\);) 19.264 Tj
+0 -60.2181 Td
+(1343 ) 3.01 Tj
+0 -61.5272 Td
+(1344 // fake a trap frame as if a user process had made a system) 39.732 Tj
+0 -62.8363 Td
+(1345 // call, so that copyproc will have a place for the new) 37.324 Tj
+0 -64.1454 Td
+(1346 // process to return to.) 18.662 Tj
+0 -65.4545 Td
+(1347 p0->tf = &tf;) 12.04 Tj
+0 -66.7636 Td
+(1348 memset\(p0->tf, 0, sizeof\(struct trapframe\)\);) 30.702 Tj
+0 -68.0727 Td
+(1349 p0->tf->es = p0->tf->ds = p0->tf->ss = \(SEG_UDATA << 3\) | 3;) 40.334 Tj
+0 -72 Td
+(Sheet 13) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/main.c Page 4) 22.274 Tj
+0 -3.92728 Td
+(1350 p0->tf->cs = \(SEG_UCODE << 3\) | 3;) 24.682 Tj
+0 -5.23637 Td
+(1351 p0->tf->eflags = FL_IF;) 18.06 Tj
+0 -6.54546 Td
+(1352 p0->tf->esp = p0->sz;) 16.856 Tj
+0 -7.85455 Td
+(1353 ) 3.01 Tj
+0 -9.16364 Td
+(1354 p1 = copyproc\(p0\);) 15.05 Tj
+0 -10.4727 Td
+(1355 ) 3.01 Tj
+0 -11.7818 Td
+(1356 load_icode\(p1, _binary__init_start, \(uint\) _binary__init_size\);) 42.14 Tj
+0 -13.0909 Td
+(1357 p1->state = RUNNABLE;) 16.856 Tj
+0 -14.4 Td
+(1358 ) 3.01 Tj
+0 -15.7091 Td
+(1359 proc_wait\(\);) 11.438 Tj
+0 -17.0182 Td
+(1360 panic\("init exited"\);) 16.856 Tj
+0 -18.3273 Td
+(1361 }) 3.612 Tj
+0 -19.6364 Td
+(1362 ) 3.01 Tj
+0 -20.9455 Td
+(1363 void) 5.418 Tj
+0 -22.2545 Td
+(1364 load_icode\(struct proc *p, uchar *binary, uint size\)) 34.314 Tj
+0 -23.5636 Td
+(1365 {) 3.612 Tj
+0 -24.8727 Td
+(1366 int i;) 7.826 Tj
+0 -26.1818 Td
+(1367 struct elfhdr *elf;) 15.652 Tj
+0 -27.4909 Td
+(1368 struct proghdr *ph;) 15.652 Tj
+0 -28.8 Td
+(1369 ) 3.01 Tj
+0 -30.1091 Td
+(1370 elf = \(struct elfhdr*\) binary;) 22.274 Tj
+0 -31.4182 Td
+(1371 if\(elf->magic != ELF_MAGIC\)) 20.468 Tj
+0 -32.7273 Td
+(1372 panic\("load_icode: not an ELF binary"\);) 28.896 Tj
+0 -34.0364 Td
+(1373 ) 3.01 Tj
+0 -35.3454 Td
+(1374 p->tf->eip = elf->entry;) 18.662 Tj
+0 -36.6545 Td
+(1375 ) 3.01 Tj
+0 -37.9636 Td
+(1376 // Map and load segments as directed.) 26.488 Tj
+0 -39.2727 Td
+(1377 ph = \(struct proghdr*\) \(binary + elf->phoff\);) 31.304 Tj
+0 -40.5818 Td
+(1378 for\(i = 0; i < elf->phnum; i++, ph++\) {) 27.692 Tj
+0 -41.8909 Td
+(1379 if\(ph->type != ELF_PROG_LOAD\)) 22.876 Tj
+0 -43.2 Td
+(1380 continue;) 12.04 Tj
+0 -44.5091 Td
+(1381 if\(ph->va + ph->memsz < ph->va\)) 24.08 Tj
+0 -45.8182 Td
+(1382 panic\("load_icode: overflow in proghdr"\);) 31.304 Tj
+0 -47.1272 Td
+(1383 if\(ph->va + ph->memsz >= p->sz\)) 24.08 Tj
+0 -48.4363 Td
+(1384 panic\("load_icode: icode too large"\);) 28.896 Tj
+0 -49.7454 Td
+(1385 ) 3.01 Tj
+0 -51.0545 Td
+(1386 // Load/clear the segment) 20.468 Tj
+0 -52.3636 Td
+(1387 memmove\(p->mem + ph->va, binary + ph->offset, ph->filesz\);) 40.334 Tj
+0 -53.6727 Td
+(1388 memset\(p->mem + ph->va + ph->filesz, 0, ph->memsz - ph->filesz\);) 43.946 Tj
+0 -54.9818 Td
+(1389 }) 4.816 Tj
+0 -56.2909 Td
+(1390 }) 3.612 Tj
+0 -57.6 Td
+(1391 ) 3.01 Tj
+0 -58.9091 Td
+(1392 ) 3.01 Tj
+0 -60.2181 Td
+(1393 ) 3.01 Tj
+0 -61.5272 Td
+(1394 ) 3.01 Tj
+0 -62.8363 Td
+(1395 ) 3.01 Tj
+0 -64.1454 Td
+(1396 ) 3.01 Tj
+0 -65.4545 Td
+(1397 ) 3.01 Tj
+0 -66.7636 Td
+(1398 ) 3.01 Tj
+0 -68.0727 Td
+(1399 ) 3.01 Tj
+0 -72 Td
+(Sheet 13) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 21 21
+%%BeginPageSetup
+%%PageOrientation: Landscape
+pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/mp.c Page 1) 21.07 Tj
+0 -3.92728 Td
+(1400 #include "types.h") 13.846 Tj
+0 -5.23637 Td
+(1401 #include "mp.h") 12.04 Tj
+0 -6.54546 Td
+(1402 #include "defs.h") 13.244 Tj
+0 -7.85455 Td
+(1403 #include "param.h") 13.846 Tj
+0 -9.16364 Td
+(1404 #include "x86.h") 12.642 Tj
+0 -10.4727 Td
+(1405 #include "traps.h") 13.846 Tj
+0 -11.7818 Td
+(1406 #include "mmu.h") 12.642 Tj
+0 -13.0909 Td
+(1407 #include "proc.h") 13.244 Tj
+0 -14.4 Td
+(1408 ) 3.01 Tj
+0 -15.7091 Td
+(1409 static char *buses[] = {) 17.458 Tj
+0 -17.0182 Td
+(1410 "CBUSI ",) 9.632 Tj
+0 -18.3273 Td
+(1411 "CBUSII",) 9.632 Tj
+0 -19.6364 Td
+(1412 "EISA ",) 9.632 Tj
+0 -20.9455 Td
+(1413 "FUTURE",) 9.632 Tj
+0 -22.2545 Td
+(1414 "INTERN",) 9.632 Tj
+0 -23.5636 Td
+(1415 "ISA ",) 9.632 Tj
+0 -24.8727 Td
+(1416 "MBI ",) 9.632 Tj
+0 -26.1818 Td
+(1417 "MBII ",) 9.632 Tj
+0 -27.4909 Td
+(1418 "MCA ",) 9.632 Tj
+0 -28.8 Td
+(1419 "MPI ",) 9.632 Tj
+0 -30.1091 Td
+(1420 "MPSA ",) 9.632 Tj
+0 -31.4182 Td
+(1421 "NUBUS ",) 9.632 Tj
+0 -32.7273 Td
+(1422 "PCI ",) 9.632 Tj
+0 -34.0364 Td
+(1423 "PCMCIA",) 9.632 Tj
+0 -35.3454 Td
+(1424 "TC ",) 9.632 Tj
+0 -36.6545 Td
+(1425 "VL ",) 9.632 Tj
+0 -37.9636 Td
+(1426 "VME ",) 9.632 Tj
+0 -39.2727 Td
+(1427 "XPRESS",) 9.632 Tj
+0 -40.5818 Td
+(1428 0,) 5.418 Tj
+0 -41.8909 Td
+(1429 };) 4.214 Tj
+0 -43.2 Td
+(1430 ) 3.01 Tj
+0 -44.5091 Td
+(1431 struct cpu cpus[NCPU];) 16.254 Tj
+0 -45.8182 Td
+(1432 int ismp;) 8.428 Tj
+0 -47.1272 Td
+(1433 int ncpu;) 8.428 Tj
+0 -48.4363 Td
+(1434 uchar ioapic_id;) 12.642 Tj
+0 -49.7454 Td
+(1435 ) 3.01 Tj
+0 -51.0545 Td
+(1436 static struct cpu *bcpu;) 17.458 Tj
+0 -52.3636 Td
+(1437 static struct mp *mp; // The MP floating point structure) 37.324 Tj
+0 -53.6727 Td
+(1438 ) 3.01 Tj
+0 -54.9818 Td
+(1439 static struct mp*) 13.244 Tj
+0 -56.2909 Td
+(1440 mp_scan\(uchar *addr, int len\)) 20.468 Tj
+0 -57.6 Td
+(1441 {) 3.612 Tj
+0 -58.9091 Td
+(1442 uchar *e, *p, sum;) 15.05 Tj
+0 -60.2181 Td
+(1443 int i;) 7.826 Tj
+0 -61.5272 Td
+(1444 ) 3.01 Tj
+0 -62.8363 Td
+(1445 e = addr+len;) 12.04 Tj
+0 -64.1454 Td
+(1446 for\(p = addr; p < e; p += sizeof\(struct mp\)\){) 31.304 Tj
+0 -65.4545 Td
+(1447 if\(memcmp\(p, "_MP_", 4\)\)) 19.866 Tj
+0 -66.7636 Td
+(1448 continue;) 12.04 Tj
+0 -68.0727 Td
+(1449 sum = 0;) 10.234 Tj
+0 -72 Td
+(Sheet 14) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/mp.c Page 2) 21.07 Tj
+0 -3.92728 Td
+(1450 for\(i = 0; i < sizeof\(struct mp\); i++\)) 28.294 Tj
+0 -5.23637 Td
+(1451 sum += p[i];) 13.846 Tj
+0 -6.54546 Td
+(1452 if\(sum == 0\)) 12.642 Tj
+0 -7.85455 Td
+(1453 return \(struct mp*\)p;) 19.264 Tj
+0 -9.16364 Td
+(1454 }) 4.816 Tj
+0 -10.4727 Td
+(1455 return 0;) 9.632 Tj
+0 -11.7818 Td
+(1456 }) 3.612 Tj
+0 -13.0909 Td
+(1457 ) 3.01 Tj
+0 -14.4 Td
+(1458 // Search for the MP Floating Pointer Structure, which according to the) 45.752 Tj
+0 -15.7091 Td
+(1459 // spec is in one of the following three locations:) 33.712 Tj
+0 -17.0182 Td
+(1460 // 1\) in the first KB of the EBDA;) 23.478 Tj
+0 -18.3273 Td
+(1461 // 2\) in the last KB of system base memory;) 28.896 Tj
+0 -19.6364 Td
+(1462 // 3\) in the BIOS ROM between 0xE0000 and 0xFFFFF.) 33.11 Tj
+0 -20.9455 Td
+(1463 static struct mp*) 13.244 Tj
+0 -22.2545 Td
+(1464 mp_search\(void\)) 12.04 Tj
+0 -23.5636 Td
+(1465 {) 3.612 Tj
+0 -24.8727 Td
+(1466 uchar *bda;) 10.836 Tj
+0 -26.1818 Td
+(1467 uint p;) 8.428 Tj
+0 -27.4909 Td
+(1468 struct mp *mp;) 12.642 Tj
+0 -28.8 Td
+(1469 ) 3.01 Tj
+0 -30.1091 Td
+(1470 bda = \(uchar*\) 0x400;) 16.856 Tj
+0 -31.4182 Td
+(1471 if\(\(p = \(bda[0x0F]<<8\)|bda[0x0E]\)\){) 25.284 Tj
+0 -32.7273 Td
+(1472 if\(\(mp = mp_scan\(\(uchar*\) p, 1024\)\)\)) 27.09 Tj
+0 -34.0364 Td
+(1473 return mp;) 12.642 Tj
+0 -35.3454 Td
+(1474 }) 4.816 Tj
+0 -36.6545 Td
+(1475 else{) 7.224 Tj
+0 -37.9636 Td
+(1476 p = \(\(bda[0x14]<<8\)|bda[0x13]\)*1024;) 27.09 Tj
+0 -39.2727 Td
+(1477 if\(\(mp = mp_scan\(\(uchar*\)p-1024, 1024\)\)\)) 29.498 Tj
+0 -40.5818 Td
+(1478 return mp;) 12.642 Tj
+0 -41.8909 Td
+(1479 }) 4.816 Tj
+0 -43.2 Td
+(1480 return mp_scan\(\(uchar*\)0xF0000, 0x10000\);) 28.896 Tj
+0 -44.5091 Td
+(1481 }) 3.612 Tj
+0 -45.8182 Td
+(1482 ) 3.01 Tj
+0 -47.1272 Td
+(1483 // Search for an MP configuration table. For now,) 32.508 Tj
+0 -48.4363 Td
+(1484 // don't accept the default configurations \(physaddr == 0\).) 38.528 Tj
+0 -49.7454 Td
+(1485 // Check for correct signature, calculate the checksum and,) 38.528 Tj
+0 -51.0545 Td
+(1486 // if correct, check the version.) 22.876 Tj
+0 -52.3636 Td
+(1487 // To do: check extended table checksum.) 27.09 Tj
+0 -53.6727 Td
+(1488 static int) 9.03 Tj
+0 -54.9818 Td
+(1489 mp_detect\(void\)) 12.04 Tj
+0 -56.2909 Td
+(1490 {) 3.612 Tj
+0 -57.6 Td
+(1491 struct mpctb *pcmp;) 15.652 Tj
+0 -58.9091 Td
+(1492 uchar *p, sum;) 12.642 Tj
+0 -60.2181 Td
+(1493 uint length;) 11.438 Tj
+0 -61.5272 Td
+(1494 ) 3.01 Tj
+0 -62.8363 Td
+(1495 if\(\(mp = mp_search\(\)\) == 0 || mp->physaddr == 0\)) 33.11 Tj
+0 -64.1454 Td
+(1496 return 1;) 10.836 Tj
+0 -65.4545 Td
+(1497 ) 3.01 Tj
+0 -66.7636 Td
+(1498 ) 3.01 Tj
+0 -68.0727 Td
+(1499 ) 3.01 Tj
+0 -72 Td
+(Sheet 14) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 22 22
+%%BeginPageSetup
+%%PageOrientation: Landscape
+__tumble pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/mp.c Page 3) 21.07 Tj
+0 -3.92728 Td
+(1500 pcmp = \(struct mpctb*\) mp->physaddr;) 25.886 Tj
+0 -5.23637 Td
+(1501 if\(memcmp\(pcmp, "PCMP", 4\)\)) 20.468 Tj
+0 -6.54546 Td
+(1502 return 2;) 10.836 Tj
+0 -7.85455 Td
+(1503 ) 3.01 Tj
+0 -9.16364 Td
+(1504 length = pcmp->length;) 17.458 Tj
+0 -10.4727 Td
+(1505 sum = 0;) 9.03 Tj
+0 -11.7818 Td
+(1506 for\(p = \(uchar*\)pcmp; length; length--\)) 27.692 Tj
+0 -13.0909 Td
+(1507 sum += *p++;) 12.642 Tj
+0 -14.4 Td
+(1508 ) 3.01 Tj
+0 -15.7091 Td
+(1509 if\(sum || \(pcmp->version != 1 && pcmp->version != 4\)\)) 36.12 Tj
+0 -17.0182 Td
+(1510 return 3;) 10.836 Tj
+0 -18.3273 Td
+(1511 ) 3.01 Tj
+0 -19.6364 Td
+(1512 return 0;) 9.632 Tj
+0 -20.9455 Td
+(1513 }) 3.612 Tj
+0 -22.2545 Td
+(1514 ) 3.01 Tj
+0 -23.5636 Td
+(1515 void) 5.418 Tj
+0 -24.8727 Td
+(1516 mp_init\(void\)) 10.836 Tj
+0 -26.1818 Td
+(1517 {) 3.612 Tj
+0 -27.4909 Td
+(1518 int r;) 7.826 Tj
+0 -28.8 Td
+(1519 uchar *p, *e;) 12.04 Tj
+0 -30.1091 Td
+(1520 struct mpctb *mpctb;) 16.254 Tj
+0 -31.4182 Td
+(1521 struct mppe *proc;) 15.05 Tj
+0 -32.7273 Td
+(1522 struct mpbe *bus;) 14.448 Tj
+0 -34.0364 Td
+(1523 struct mpioapic *ioapic;) 18.662 Tj
+0 -35.3454 Td
+(1524 struct mpie *intr;) 15.05 Tj
+0 -36.6545 Td
+(1525 int i;) 7.826 Tj
+0 -37.9636 Td
+(1526 uchar byte;) 10.836 Tj
+0 -39.2727 Td
+(1527 ) 3.01 Tj
+0 -40.5818 Td
+(1528 ncpu = 0;) 9.632 Tj
+0 -41.8909 Td
+(1529 if\(\(r = mp_detect\(\)\) != 0\) {) 21.07 Tj
+0 -43.2 Td
+(1530 return;) 9.632 Tj
+0 -44.5091 Td
+(1531 }) 4.816 Tj
+0 -45.8182 Td
+(1532 ) 3.01 Tj
+0 -47.1272 Td
+(1533 ismp = 1;) 9.632 Tj
+0 -48.4363 Td
+(1534 ) 3.01 Tj
+0 -49.7454 Td
+(1535 // Run through the table saving information needed for starting) 42.14 Tj
+0 -51.0545 Td
+(1536 // application processors and initialising any I/O APICs. The table) 44.548 Tj
+0 -52.3636 Td
+(1537 // is guaranteed to be in order such that only one pass is necessary.) 45.752 Tj
+0 -53.6727 Td
+(1538 ) 3.01 Tj
+0 -54.9818 Td
+(1539 mpctb = \(struct mpctb*\) mp->physaddr;) 26.488 Tj
+0 -56.2909 Td
+(1540 lapicaddr = \(uint*\) mpctb->lapicaddr;) 26.488 Tj
+0 -57.6 Td
+(1541 p = \(\(uchar*\)mpctb\)+sizeof\(struct mpctb\);) 28.896 Tj
+0 -58.9091 Td
+(1542 e = \(\(uchar*\)mpctb\)+mpctb->length;) 24.682 Tj
+0 -60.2181 Td
+(1543 ) 3.01 Tj
+0 -61.5272 Td
+(1544 while\(p < e\) {) 12.642 Tj
+0 -62.8363 Td
+(1545 switch\(*p\){) 12.04 Tj
+0 -64.1454 Td
+(1546 case MPPROCESSOR:) 15.652 Tj
+0 -65.4545 Td
+(1547 proc = \(struct mppe*\) p;) 21.07 Tj
+0 -66.7636 Td
+(1548 cpus[ncpu].apicid = proc->apicid;) 26.488 Tj
+0 -68.0727 Td
+(1549 if\(proc->flags & MPBP\) {) 21.07 Tj
+0 -72 Td
+(Sheet 15) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/mp.c Page 4) 21.07 Tj
+0 -3.92728 Td
+(1550 bcpu = &cpus[ncpu];) 19.264 Tj
+0 -5.23637 Td
+(1551 }) 7.224 Tj
+0 -6.54546 Td
+(1552 ncpu++;) 10.836 Tj
+0 -7.85455 Td
+(1553 p += sizeof\(struct mppe\);) 21.672 Tj
+0 -9.16364 Td
+(1554 continue;) 12.04 Tj
+0 -10.4727 Td
+(1555 case MPBUS:) 12.04 Tj
+0 -11.7818 Td
+(1556 bus = \(struct mpbe*\) p;) 20.468 Tj
+0 -13.0909 Td
+(1557 for\(i = 0; buses[i]; i++\){) 22.274 Tj
+0 -14.4 Td
+(1558 if\(strncmp\(buses[i], bus->string, sizeof\(bus->string\)\) == 0\)) 43.946 Tj
+0 -15.7091 Td
+(1559 break;) 12.642 Tj
+0 -17.0182 Td
+(1560 }) 7.224 Tj
+0 -18.3273 Td
+(1561 p += sizeof\(struct mpbe\);) 21.672 Tj
+0 -19.6364 Td
+(1562 continue;) 12.04 Tj
+0 -20.9455 Td
+(1563 case MPIOAPIC:) 13.846 Tj
+0 -22.2545 Td
+(1564 ioapic = \(struct mpioapic*\) p;) 24.682 Tj
+0 -23.5636 Td
+(1565 ioapic_id = ioapic->apicno;) 22.876 Tj
+0 -24.8727 Td
+(1566 p += sizeof\(struct mpioapic\);) 24.08 Tj
+0 -26.1818 Td
+(1567 continue;) 12.04 Tj
+0 -27.4909 Td
+(1568 case MPIOINTR:) 13.846 Tj
+0 -28.8 Td
+(1569 intr = \(struct mpie*\) p;) 21.07 Tj
+0 -30.1091 Td
+(1570 p += sizeof\(struct mpie\);) 21.672 Tj
+0 -31.4182 Td
+(1571 continue;) 12.04 Tj
+0 -32.7273 Td
+(1572 default:) 10.234 Tj
+0 -34.0364 Td
+(1573 cprintf\("mp_init: unknown PCMP type 0x%x \(e-p 0x%x\)\\n", *p, e-p\);) 45.752 Tj
+0 -35.3454 Td
+(1574 while\(p < e\){) 14.448 Tj
+0 -36.6545 Td
+(1575 cprintf\("%uX ", *p\);) 19.866 Tj
+0 -37.9636 Td
+(1576 p++;) 10.234 Tj
+0 -39.2727 Td
+(1577 }) 7.224 Tj
+0 -40.5818 Td
+(1578 break;) 10.234 Tj
+0 -41.8909 Td
+(1579 }) 6.02 Tj
+0 -43.2 Td
+(1580 }) 4.816 Tj
+0 -44.5091 Td
+(1581 ) 3.01 Tj
+0 -45.8182 Td
+(1582 if\(mp->imcrp\) {) 13.244 Tj
+0 -47.1272 Td
+(1583 // It appears that Bochs doesn't support IMCR, so code won't run.) 44.548 Tj
+0 -48.4363 Td
+(1584 outb\(0x22, 0x70\); // Select IMCR) 25.886 Tj
+0 -49.7454 Td
+(1585 byte = inb\(0x23\); // Current contents) 28.896 Tj
+0 -51.0545 Td
+(1586 byte |= 0x01; // Mask external INTR) 30.1 Tj
+0 -52.3636 Td
+(1587 outb\(0x23, byte\); // Disconnect 8259s/NMI) 31.304 Tj
+0 -53.6727 Td
+(1588 }) 4.816 Tj
+0 -54.9818 Td
+(1589 }) 3.612 Tj
+0 -56.2909 Td
+(1590 ) 3.01 Tj
+0 -57.6 Td
+(1591 ) 3.01 Tj
+0 -58.9091 Td
+(1592 int) 4.816 Tj
+0 -60.2181 Td
+(1593 mp_bcpu\(void\)) 10.836 Tj
+0 -61.5272 Td
+(1594 {) 3.612 Tj
+0 -62.8363 Td
+(1595 if\(ismp\)) 9.03 Tj
+0 -64.1454 Td
+(1596 return bcpu-cpus;) 15.652 Tj
+0 -65.4545 Td
+(1597 return 0;) 9.632 Tj
+0 -66.7636 Td
+(1598 }) 3.612 Tj
+0 -68.0727 Td
+(1599 ) 3.01 Tj
+0 -72 Td
+(Sheet 15) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 23 23
+%%BeginPageSetup
+%%PageOrientation: Landscape
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+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
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+(Sep 8 11:37 2006 xv6/mp.c Page 5) 21.07 Tj
+0 -3.92728 Td
+(1600 extern void mpmain\(void\);) 18.06 Tj
+0 -5.23637 Td
+(1601 ) 3.01 Tj
+0 -6.54546 Td
+(1602 // Write bootstrap code to unused memory at 0x7000.) 33.712 Tj
+0 -7.85455 Td
+(1603 #define APBOOTCODE 0x7000) 18.06 Tj
+0 -9.16364 Td
+(1604 ) 3.01 Tj
+0 -10.4727 Td
+(1605 void) 5.418 Tj
+0 -11.7818 Td
+(1606 mp_startthem\(void\)) 13.846 Tj
+0 -13.0909 Td
+(1607 {) 3.612 Tj
+0 -14.4 Td
+(1608 extern uchar _binary_bootother_start[], _binary_bootother_size[];) 43.344 Tj
+0 -15.7091 Td
+(1609 extern int main\(\);) 15.05 Tj
+0 -17.0182 Td
+(1610 int c;) 7.826 Tj
+0 -18.3273 Td
+(1611 ) 3.01 Tj
+0 -19.6364 Td
+(1612 memmove\(\(void*\) APBOOTCODE,_binary_bootother_start,) 34.916 Tj
+0 -20.9455 Td
+(1613 \(uint\) _binary_bootother_size\);) 27.692 Tj
+0 -22.2545 Td
+(1614 ) 3.01 Tj
+0 -23.5636 Td
+(1615 for\(c = 0; c < ncpu; c++\){) 19.866 Tj
+0 -24.8727 Td
+(1616 // Our current cpu has already started.) 28.896 Tj
+0 -26.1818 Td
+(1617 if\(c == cpu\(\)\)) 13.846 Tj
+0 -27.4909 Td
+(1618 continue;) 12.04 Tj
+0 -28.8 Td
+(1619 ) 3.01 Tj
+0 -30.1091 Td
+(1620 // Set target %esp) 16.254 Tj
+0 -31.4182 Td
+(1621 *\(uint*\)\(APBOOTCODE-4\) = \(uint\) \(cpus[c].mpstack\) + MPSTACK;) 41.538 Tj
+0 -32.7273 Td
+(1622 ) 3.01 Tj
+0 -34.0364 Td
+(1623 // Set target %eip) 16.254 Tj
+0 -35.3454 Td
+(1624 *\(uint*\)\(APBOOTCODE-8\) = \(uint\)mpmain;) 28.294 Tj
+0 -36.6545 Td
+(1625 ) 3.01 Tj
+0 -37.9636 Td
+(1626 // Go!) 9.03 Tj
+0 -39.2727 Td
+(1627 lapic_startap\(cpus[c].apicid, \(uint\) APBOOTCODE\);) 34.916 Tj
+0 -40.5818 Td
+(1628 ) 3.01 Tj
+0 -41.8909 Td
+(1629 // Wait for cpu to get through bootstrap.) 30.1 Tj
+0 -43.2 Td
+(1630 while\(cpus[c].booted == 0\)) 21.07 Tj
+0 -44.5091 Td
+(1631 ;) 7.224 Tj
+0 -45.8182 Td
+(1632 }) 4.816 Tj
+0 -47.1272 Td
+(1633 }) 3.612 Tj
+0 -48.4363 Td
+(1634 ) 3.01 Tj
+0 -49.7454 Td
+(1635 ) 3.01 Tj
+0 -51.0545 Td
+(1636 ) 3.01 Tj
+0 -52.3636 Td
+(1637 ) 3.01 Tj
+0 -53.6727 Td
+(1638 ) 3.01 Tj
+0 -54.9818 Td
+(1639 ) 3.01 Tj
+0 -56.2909 Td
+(1640 ) 3.01 Tj
+0 -57.6 Td
+(1641 ) 3.01 Tj
+0 -58.9091 Td
+(1642 ) 3.01 Tj
+0 -60.2181 Td
+(1643 ) 3.01 Tj
+0 -61.5272 Td
+(1644 ) 3.01 Tj
+0 -62.8363 Td
+(1645 ) 3.01 Tj
+0 -64.1454 Td
+(1646 ) 3.01 Tj
+0 -65.4545 Td
+(1647 ) 3.01 Tj
+0 -66.7636 Td
+(1648 ) 3.01 Tj
+0 -68.0727 Td
+(1649 ) 3.01 Tj
+0 -72 Td
+(Sheet 16) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/init.c Page 1) 22.274 Tj
+0 -3.92728 Td
+(1650 #include "types.h") 13.846 Tj
+0 -5.23637 Td
+(1651 #include "stat.h") 13.244 Tj
+0 -6.54546 Td
+(1652 #include "user.h") 13.244 Tj
+0 -7.85455 Td
+(1653 #include "fs.h") 12.04 Tj
+0 -9.16364 Td
+(1654 #include "fcntl.h") 13.846 Tj
+0 -10.4727 Td
+(1655 ) 3.01 Tj
+0 -11.7818 Td
+(1656 // init: The initial user-level program) 26.488 Tj
+0 -13.0909 Td
+(1657 ) 3.01 Tj
+0 -14.4 Td
+(1658 char *sh_args[] = { "sh", 0 };) 21.07 Tj
+0 -15.7091 Td
+(1659 ) 3.01 Tj
+0 -17.0182 Td
+(1660 int) 4.816 Tj
+0 -18.3273 Td
+(1661 main\(void\)) 9.03 Tj
+0 -19.6364 Td
+(1662 {) 3.612 Tj
+0 -20.9455 Td
+(1663 int pid;) 9.03 Tj
+0 -22.2545 Td
+(1664 ) 3.01 Tj
+0 -23.5636 Td
+(1665 if\(open\("console", O_RDWR\) < 0\){) 23.478 Tj
+0 -24.8727 Td
+(1666 mknod\("console", T_DEV, 1, 1\);) 23.478 Tj
+0 -26.1818 Td
+(1667 open\("console", O_RDWR\);) 19.866 Tj
+0 -27.4909 Td
+(1668 }) 4.816 Tj
+0 -28.8 Td
+(1669 dup\(0\); // stdout) 15.05 Tj
+0 -30.1091 Td
+(1670 dup\(0\); // stderr) 15.05 Tj
+0 -31.4182 Td
+(1671 ) 3.01 Tj
+0 -32.7273 Td
+(1672 for\(;;\){) 9.03 Tj
+0 -34.0364 Td
+(1673 pid = fork\(\);) 13.244 Tj
+0 -35.3454 Td
+(1674 if\(pid < 0\){) 12.642 Tj
+0 -36.6545 Td
+(1675 puts\("init: fork failed\\n"\);) 23.478 Tj
+0 -37.9636 Td
+(1676 exit\(\);) 10.836 Tj
+0 -39.2727 Td
+(1677 }) 6.02 Tj
+0 -40.5818 Td
+(1678 if\(pid == 0\){) 13.244 Tj
+0 -41.8909 Td
+(1679 exec\("sh", sh_args\);) 18.662 Tj
+0 -43.2 Td
+(1680 puts\("init: exec sh failed\\n"\);) 25.284 Tj
+0 -44.5091 Td
+(1681 exit\(\);) 10.836 Tj
+0 -45.8182 Td
+(1682 } else {) 10.234 Tj
+0 -47.1272 Td
+(1683 wait\(\);) 10.836 Tj
+0 -48.4363 Td
+(1684 }) 6.02 Tj
+0 -49.7454 Td
+(1685 }) 4.816 Tj
+0 -51.0545 Td
+(1686 }) 3.612 Tj
+0 -52.3636 Td
+(1687 ) 3.01 Tj
+0 -53.6727 Td
+(1688 ) 3.01 Tj
+0 -54.9818 Td
+(1689 ) 3.01 Tj
+0 -56.2909 Td
+(1690 ) 3.01 Tj
+0 -57.6 Td
+(1691 ) 3.01 Tj
+0 -58.9091 Td
+(1692 ) 3.01 Tj
+0 -60.2181 Td
+(1693 ) 3.01 Tj
+0 -61.5272 Td
+(1694 ) 3.01 Tj
+0 -62.8363 Td
+(1695 ) 3.01 Tj
+0 -64.1454 Td
+(1696 ) 3.01 Tj
+0 -65.4545 Td
+(1697 ) 3.01 Tj
+0 -66.7636 Td
+(1698 ) 3.01 Tj
+0 -68.0727 Td
+(1699 ) 3.01 Tj
+0 -72 Td
+(Sheet 16) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 24 24
+%%BeginPageSetup
+%%PageOrientation: Landscape
+__tumble pdfStartPage
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+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
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+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/spinlock.h Page 1) 24.682 Tj
+0 -3.92728 Td
+(1700 // Mutual exclusion lock.) 18.06 Tj
+0 -5.23637 Td
+(1701 struct spinlock {) 13.244 Tj
+0 -6.54546 Td
+(1702 uint locked; // Is the lock held?) 25.284 Tj
+0 -7.85455 Td
+(1703 ) 3.01 Tj
+0 -9.16364 Td
+(1704 // For debugging:) 14.448 Tj
+0 -10.4727 Td
+(1705 char *name; // Name of lock.) 22.876 Tj
+0 -11.7818 Td
+(1706 int cpu; // The number of the cpu holding the lock.) 38.528 Tj
+0 -13.0909 Td
+(1707 uint pcs[10]; // The call stack \(an array of program counters\)) 42.14 Tj
+0 -14.4 Td
+(1708 // that locked the lock.) 27.692 Tj
+0 -15.7091 Td
+(1709 };) 4.214 Tj
+0 -17.0182 Td
+(1710 ) 3.01 Tj
+0 -18.3273 Td
+(1711 ) 3.01 Tj
+0 -19.6364 Td
+(1712 ) 3.01 Tj
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+(1717 ) 3.01 Tj
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+(1718 ) 3.01 Tj
+0 -28.8 Td
+(1719 ) 3.01 Tj
+0 -30.1091 Td
+(1720 ) 3.01 Tj
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+(1721 ) 3.01 Tj
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+(1722 ) 3.01 Tj
+0 -34.0364 Td
+(1723 ) 3.01 Tj
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+(1724 ) 3.01 Tj
+0 -36.6545 Td
+(1725 ) 3.01 Tj
+0 -37.9636 Td
+(1726 ) 3.01 Tj
+0 -39.2727 Td
+(1727 ) 3.01 Tj
+0 -40.5818 Td
+(1728 ) 3.01 Tj
+0 -41.8909 Td
+(1729 ) 3.01 Tj
+0 -43.2 Td
+(1730 ) 3.01 Tj
+0 -44.5091 Td
+(1731 ) 3.01 Tj
+0 -45.8182 Td
+(1732 ) 3.01 Tj
+0 -47.1272 Td
+(1733 ) 3.01 Tj
+0 -48.4363 Td
+(1734 ) 3.01 Tj
+0 -49.7454 Td
+(1735 ) 3.01 Tj
+0 -51.0545 Td
+(1736 ) 3.01 Tj
+0 -52.3636 Td
+(1737 ) 3.01 Tj
+0 -53.6727 Td
+(1738 ) 3.01 Tj
+0 -54.9818 Td
+(1739 ) 3.01 Tj
+0 -56.2909 Td
+(1740 ) 3.01 Tj
+0 -57.6 Td
+(1741 ) 3.01 Tj
+0 -58.9091 Td
+(1742 ) 3.01 Tj
+0 -60.2181 Td
+(1743 ) 3.01 Tj
+0 -61.5272 Td
+(1744 ) 3.01 Tj
+0 -62.8363 Td
+(1745 ) 3.01 Tj
+0 -64.1454 Td
+(1746 ) 3.01 Tj
+0 -65.4545 Td
+(1747 ) 3.01 Tj
+0 -66.7636 Td
+(1748 ) 3.01 Tj
+0 -68.0727 Td
+(1749 ) 3.01 Tj
+0 -72 Td
+(Sheet 17) 4.816 Tj
+Q
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+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/spinlock.c Page 1) 24.682 Tj
+0 -3.92728 Td
+(1750 // Mutual exclusion spin locks.) 21.672 Tj
+0 -5.23637 Td
+(1751 ) 3.01 Tj
+0 -6.54546 Td
+(1752 #include "types.h") 13.846 Tj
+0 -7.85455 Td
+(1753 #include "defs.h") 13.244 Tj
+0 -9.16364 Td
+(1754 #include "x86.h") 12.642 Tj
+0 -10.4727 Td
+(1755 #include "mmu.h") 12.642 Tj
+0 -11.7818 Td
+(1756 #include "param.h") 13.846 Tj
+0 -13.0909 Td
+(1757 #include "proc.h") 13.244 Tj
+0 -14.4 Td
+(1758 #include "spinlock.h") 15.652 Tj
+0 -15.7091 Td
+(1759 ) 3.01 Tj
+0 -17.0182 Td
+(1760 extern int use_console_lock;) 19.866 Tj
+0 -18.3273 Td
+(1761 ) 3.01 Tj
+0 -19.6364 Td
+(1762 void) 5.418 Tj
+0 -20.9455 Td
+(1763 initlock\(struct spinlock *lock, char *name\)) 28.896 Tj
+0 -22.2545 Td
+(1764 {) 3.612 Tj
+0 -23.5636 Td
+(1765 lock->name = name;) 15.05 Tj
+0 -24.8727 Td
+(1766 lock->locked = 0;) 14.448 Tj
+0 -26.1818 Td
+(1767 lock->cpu = 0xffffffff;) 18.06 Tj
+0 -27.4909 Td
+(1768 }) 3.612 Tj
+0 -28.8 Td
+(1769 ) 3.01 Tj
+0 -30.1091 Td
+(1770 // Record the current call stack in pcs[] by following the %ebp chain.) 45.15 Tj
+0 -31.4182 Td
+(1771 void) 5.418 Tj
+0 -32.7273 Td
+(1772 getcallerpcs\(void *v, uint pcs[]\)) 22.876 Tj
+0 -34.0364 Td
+(1773 {) 3.612 Tj
+0 -35.3454 Td
+(1774 uint *ebp = \(uint*\)v - 2;) 19.264 Tj
+0 -36.6545 Td
+(1775 int i;) 7.826 Tj
+0 -37.9636 Td
+(1776 for\(i = 0; i < 10; i++\){) 18.662 Tj
+0 -39.2727 Td
+(1777 if\(ebp == 0 || ebp == \(uint*\)0xffffffff\)) 29.498 Tj
+0 -40.5818 Td
+(1778 break;) 10.234 Tj
+0 -41.8909 Td
+(1779 pcs[i] = ebp[1]; // saved %eip) 25.886 Tj
+0 -43.2 Td
+(1780 ebp = \(uint*\)ebp[0]; // saved %ebp) 25.886 Tj
+0 -44.5091 Td
+(1781 }) 4.816 Tj
+0 -45.8182 Td
+(1782 for\(; i < 10; i++\)) 15.05 Tj
+0 -47.1272 Td
+(1783 pcs[i] = 0;) 12.04 Tj
+0 -48.4363 Td
+(1784 }) 3.612 Tj
+0 -49.7454 Td
+(1785 ) 3.01 Tj
+0 -51.0545 Td
+(1786 ) 3.01 Tj
+0 -52.3636 Td
+(1787 ) 3.01 Tj
+0 -53.6727 Td
+(1788 ) 3.01 Tj
+0 -54.9818 Td
+(1789 ) 3.01 Tj
+0 -56.2909 Td
+(1790 ) 3.01 Tj
+0 -57.6 Td
+(1791 ) 3.01 Tj
+0 -58.9091 Td
+(1792 ) 3.01 Tj
+0 -60.2181 Td
+(1793 ) 3.01 Tj
+0 -61.5272 Td
+(1794 ) 3.01 Tj
+0 -62.8363 Td
+(1795 ) 3.01 Tj
+0 -64.1454 Td
+(1796 ) 3.01 Tj
+0 -65.4545 Td
+(1797 ) 3.01 Tj
+0 -66.7636 Td
+(1798 ) 3.01 Tj
+0 -68.0727 Td
+(1799 ) 3.01 Tj
+0 -72 Td
+(Sheet 17) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 25 25
+%%BeginPageSetup
+%%PageOrientation: Landscape
+pdfStartPage
+%%EndPageSetup
+[] 0 d
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+q
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+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
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+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/spinlock.c Page 2) 24.682 Tj
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+0 -5.23637 Td
+(1801 // Loops \(spins\) until the lock is acquired.) 29.498 Tj
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+(1802 // \(Because contention is handled by spinning, must not) 36.12 Tj
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+(1803 // go to sleep holding any locks.\)) 23.478 Tj
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+(1813 ) 3.01 Tj
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+(1815 ;) 6.02 Tj
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+0 -27.4909 Td
+(1818 // we wait for all pending writes from other processors.) 37.926 Tj
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+0 -30.1091 Td
+(1820 ) 3.01 Tj
+0 -31.4182 Td
+(1821 // Record info about lock acquisition for debugging.) 35.518 Tj
+0 -32.7273 Td
+(1822 // The +10 is only so that we can tell the difference) 36.12 Tj
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+(1823 // between forgetting to initialize lock->cpu) 31.304 Tj
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+(1824 // and holding a lock on cpu 0.) 22.876 Tj
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+(1826 getcallerpcs\(&lock, lock->pcs\);) 22.876 Tj
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+(1829 // Release the lock.) 15.05 Tj
+0 -43.2 Td
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+0 -53.6727 Td
+(1838 ) 3.01 Tj
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+(1839 // Serialize instructions: before unlocking the lock, make sure) 42.14 Tj
+0 -56.2909 Td
+(1840 // to flush any pending memory writes from this processor.) 39.13 Tj
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+(1842 ) 3.01 Tj
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+(1850 // Check whether this cpu is holding the lock.) 30.702 Tj
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+(1866 ) 3.01 Tj
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+(1895 ) 3.01 Tj
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+(1896 ) 3.01 Tj
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+(1897 ) 3.01 Tj
+0 -66.7636 Td
+(1898 ) 3.01 Tj
+0 -68.0727 Td
+(1899 ) 3.01 Tj
+0 -72 Td
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+Q
+Q
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+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 26 26
+%%BeginPageSetup
+%%PageOrientation: Landscape
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+0 -3.92728 Td
+(1900 // Segments in proc->gdt) 17.458 Tj
+0 -5.23637 Td
+(1901 #define SEG_KCODE 1 // kernel code) 24.08 Tj
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+(1902 #define SEG_KDATA 2 // kernel data+stack) 27.692 Tj
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+(1907 ) 3.01 Tj
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+(1910 // because they are constant across kernel contexts.) 34.314 Tj
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+0 -19.6364 Td
+(1912 // which are caller save.) 18.06 Tj
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+(1913 // Don't save %eax, because that's the return register.) 36.12 Tj
+0 -22.2545 Td
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+0 -24.8727 Td
+(1916 int ebx;) 9.03 Tj
+0 -26.1818 Td
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+0 -27.4909 Td
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+0 -28.8 Td
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+0 -30.1091 Td
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+0 -31.4182 Td
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+0 -35.3454 Td
+(1924 };) 4.214 Tj
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+(1925 ) 3.01 Tj
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+(1926 enum proc_state { UNUSED, EMBRYO, SLEEPING, RUNNABLE, RUNNING, ZOMBIE };) 46.354 Tj
+0 -39.2727 Td
+(1927 ) 3.01 Tj
+0 -40.5818 Td
+(1928 // Per-process state) 15.05 Tj
+0 -41.8909 Td
+(1929 struct proc {) 10.836 Tj
+0 -43.2 Td
+(1930 char *mem; // Start of process memory \(kernel address\)) 45.752 Tj
+0 -44.5091 Td
+(1931 uint sz; // Size of process memory \(bytes\)) 39.732 Tj
+0 -45.8182 Td
+(1932 char *kstack; // Bottom of kernel stack for this process) 45.15 Tj
+0 -47.1272 Td
+(1933 enum proc_state state; // Process state) 29.498 Tj
+0 -48.4363 Td
+(1934 int pid; // Process ID) 27.692 Tj
+0 -49.7454 Td
+(1935 int ppid; // Parent pid) 27.692 Tj
+0 -51.0545 Td
+(1936 void *chan; // If non-zero, sleeping on chan) 39.13 Tj
+0 -52.3636 Td
+(1937 int killed; // If non-zero, have been killed) 39.13 Tj
+0 -53.6727 Td
+(1938 struct file *ofile[NOFILE]; // Open files) 29.498 Tj
+0 -54.9818 Td
+(1939 struct inode *cwd; // Current directory) 31.906 Tj
+0 -56.2909 Td
+(1940 struct jmpbuf jmpbuf; // Jump here to run process) 36.12 Tj
+0 -57.6 Td
+(1941 struct trapframe *tf; // Trap frame for current interrupt) 40.936 Tj
+0 -58.9091 Td
+(1942 };) 4.214 Tj
+0 -60.2181 Td
+(1943 ) 3.01 Tj
+0 -61.5272 Td
+(1944 ) 3.01 Tj
+0 -62.8363 Td
+(1945 ) 3.01 Tj
+0 -64.1454 Td
+(1946 ) 3.01 Tj
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+(1950 // Process memory is laid out contiguously:) 28.896 Tj
+0 -5.23637 Td
+(1951 // text) 8.428 Tj
+0 -6.54546 Td
+(1952 // original data and bss) 18.662 Tj
+0 -7.85455 Td
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+0 -9.16364 Td
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+0 -10.4727 Td
+(1955 ) 3.01 Tj
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+0 -14.4 Td
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+0 -22.2545 Td
+(1964 struct jmpbuf jmpbuf; // Jump here to enter scheduler) 39.732 Tj
+0 -23.5636 Td
+(1965 struct taskstate ts; // Used by x86 to find stack for interrupt) 46.354 Tj
+0 -24.8727 Td
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+0 -26.1818 Td
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+(2000 #include "types.h") 13.846 Tj
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+(2001 #include "mmu.h") 12.642 Tj
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+(2002 #include "x86.h") 12.642 Tj
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+(2004 #include "file.h") 13.244 Tj
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+(2022 ) 3.01 Tj
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+(2023 // Set up CPU's segment descriptors and task state for a) 36.722 Tj
+0 -35.3454 Td
+(2024 // given process.) 13.244 Tj
+0 -36.6545 Td
+(2025 // If p==0, set up for "idle" state for when scheduler\(\)) 36.722 Tj
+0 -37.9636 Td
+(2026 // is idling, not running any process.) 25.886 Tj
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+0 -49.7454 Td
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+0 -52.3636 Td
+(2037 }) 4.816 Tj
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+(2038 ) 3.01 Tj
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+0 -56.2909 Td
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+0 -57.6 Td
+(2041 c->gdt[SEG_KDATA] = SEG\(STA_W, 0, 0xffffffff, 0\);) 33.712 Tj
+0 -58.9091 Td
+(2042 c->gdt[SEG_TSS] = SEG16\(STS_T32A, \(uint\) &c->ts, sizeof\(c->ts\), 0\);) 44.548 Tj
+0 -60.2181 Td
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+0 -61.5272 Td
+(2044 if\(p\){) 7.826 Tj
+0 -62.8363 Td
+(2045 c->gdt[SEG_UCODE] = SEG\(STA_X|STA_R, \(uint\)p->mem, p->sz, 3\);) 42.14 Tj
+0 -64.1454 Td
+(2046 c->gdt[SEG_UDATA] = SEG\(STA_W, \(uint\)p->mem, p->sz, 3\);) 38.528 Tj
+0 -65.4545 Td
+(2047 } else {) 9.03 Tj
+0 -66.7636 Td
+(2048 c->gdt[SEG_UCODE] = SEG_NULL;) 22.876 Tj
+0 -68.0727 Td
+(2049 c->gdt[SEG_UDATA] = SEG_NULL;) 22.876 Tj
+0 -72 Td
+(Sheet 20) 4.816 Tj
+Q
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+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
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+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/proc.c Page 2) 22.274 Tj
+0 -3.92728 Td
+(2050 }) 4.816 Tj
+0 -5.23637 Td
+(2051 ) 3.01 Tj
+0 -6.54546 Td
+(2052 lgdt\(c->gdt, sizeof c->gdt\);) 21.07 Tj
+0 -7.85455 Td
+(2053 ltr\(SEG_TSS << 3\);) 15.05 Tj
+0 -9.16364 Td
+(2054 }) 3.612 Tj
+0 -10.4727 Td
+(2055 ) 3.01 Tj
+0 -11.7818 Td
+(2056 // Grow current process's memory by n bytes.) 29.498 Tj
+0 -13.0909 Td
+(2057 // Return old size on success, -1 on failure.) 30.1 Tj
+0 -14.4 Td
+(2058 int) 4.816 Tj
+0 -15.7091 Td
+(2059 growproc\(int n\)) 12.04 Tj
+0 -17.0182 Td
+(2060 {) 3.612 Tj
+0 -18.3273 Td
+(2061 struct proc *cp = curproc[cpu\(\)];) 24.08 Tj
+0 -19.6364 Td
+(2062 char *newmem, *oldmem;) 17.458 Tj
+0 -20.9455 Td
+(2063 ) 3.01 Tj
+0 -22.2545 Td
+(2064 newmem = kalloc\(cp->sz + n\);) 21.07 Tj
+0 -23.5636 Td
+(2065 if\(newmem == 0\)) 13.244 Tj
+0 -24.8727 Td
+(2066 return 0xffffffff;) 16.254 Tj
+0 -26.1818 Td
+(2067 memmove\(newmem, cp->mem, cp->sz\);) 24.08 Tj
+0 -27.4909 Td
+(2068 memset\(newmem + cp->sz, 0, n\);) 22.274 Tj
+0 -28.8 Td
+(2069 oldmem = cp->mem;) 14.448 Tj
+0 -30.1091 Td
+(2070 cp->mem = newmem;) 14.448 Tj
+0 -31.4182 Td
+(2071 kfree\(oldmem, cp->sz\);) 17.458 Tj
+0 -32.7273 Td
+(2072 cp->sz += n;) 11.438 Tj
+0 -34.0364 Td
+(2073 return cp->sz - n;) 15.05 Tj
+0 -35.3454 Td
+(2074 }) 3.612 Tj
+0 -36.6545 Td
+(2075 ) 3.01 Tj
+0 -37.9636 Td
+(2076 // Look in the process table for an UNUSED proc.) 31.906 Tj
+0 -39.2727 Td
+(2077 // If found, change state to EMBRYO and return it.) 33.11 Tj
+0 -40.5818 Td
+(2078 // Otherwise return 0.) 16.254 Tj
+0 -41.8909 Td
+(2079 struct proc*) 10.234 Tj
+0 -43.2 Td
+(2080 allocproc\(void\)) 12.04 Tj
+0 -44.5091 Td
+(2081 {) 3.612 Tj
+0 -45.8182 Td
+(2082 int i;) 7.826 Tj
+0 -47.1272 Td
+(2083 struct proc *p;) 13.244 Tj
+0 -48.4363 Td
+(2084 ) 3.01 Tj
+0 -49.7454 Td
+(2085 for\(i = 0; i < NPROC; i++\){) 20.468 Tj
+0 -51.0545 Td
+(2086 p = &proc[i];) 13.244 Tj
+0 -52.3636 Td
+(2087 if\(p->state == UNUSED\){) 19.264 Tj
+0 -53.6727 Td
+(2088 p->state = EMBRYO;) 17.458 Tj
+0 -54.9818 Td
+(2089 return p;) 12.04 Tj
+0 -56.2909 Td
+(2090 }) 6.02 Tj
+0 -57.6 Td
+(2091 }) 4.816 Tj
+0 -58.9091 Td
+(2092 return 0;) 9.632 Tj
+0 -60.2181 Td
+(2093 }) 3.612 Tj
+0 -61.5272 Td
+(2094 ) 3.01 Tj
+0 -62.8363 Td
+(2095 ) 3.01 Tj
+0 -64.1454 Td
+(2096 ) 3.01 Tj
+0 -65.4545 Td
+(2097 ) 3.01 Tj
+0 -66.7636 Td
+(2098 ) 3.01 Tj
+0 -68.0727 Td
+(2099 ) 3.01 Tj
+0 -72 Td
+(Sheet 20) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 28 28
+%%BeginPageSetup
+%%PageOrientation: Landscape
+__tumble pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
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+1 w
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+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
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+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
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+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/proc.c Page 3) 22.274 Tj
+0 -3.92728 Td
+(2100 // Create a new process copying p as the parent.) 31.906 Tj
+0 -5.23637 Td
+(2101 // Does not copy the kernel stack.) 23.478 Tj
+0 -6.54546 Td
+(2102 // Instead, sets up stack to return as if from system call.) 38.528 Tj
+0 -7.85455 Td
+(2103 // Caller must arrange for process to run \(set state to RUNNABLE\).) 42.742 Tj
+0 -9.16364 Td
+(2104 struct proc*) 10.234 Tj
+0 -10.4727 Td
+(2105 copyproc\(struct proc *p\)) 17.458 Tj
+0 -11.7818 Td
+(2106 {) 3.612 Tj
+0 -13.0909 Td
+(2107 int i;) 7.826 Tj
+0 -14.4 Td
+(2108 struct proc *np;) 13.846 Tj
+0 -15.7091 Td
+(2109 ) 3.01 Tj
+0 -17.0182 Td
+(2110 // Allocate process.) 16.254 Tj
+0 -18.3273 Td
+(2111 acquire\(&proc_table_lock\);) 19.866 Tj
+0 -19.6364 Td
+(2112 if\(\(np = allocproc\(\)\) == 0\){) 21.07 Tj
+0 -20.9455 Td
+(2113 release\(&proc_table_lock\);) 21.07 Tj
+0 -22.2545 Td
+(2114 return 0;) 10.836 Tj
+0 -23.5636 Td
+(2115 }) 4.816 Tj
+0 -24.8727 Td
+(2116 np->pid = next_pid++;) 16.856 Tj
+0 -26.1818 Td
+(2117 np->ppid = p->pid;) 15.05 Tj
+0 -27.4909 Td
+(2118 release\(&proc_table_lock\);) 19.866 Tj
+0 -28.8 Td
+(2119 ) 3.01 Tj
+0 -30.1091 Td
+(2120 // Copy user memory.) 16.254 Tj
+0 -31.4182 Td
+(2121 np->sz = p->sz;) 13.244 Tj
+0 -32.7273 Td
+(2122 np->mem = kalloc\(np->sz\);) 19.264 Tj
+0 -34.0364 Td
+(2123 if\(np->mem == 0\){) 14.448 Tj
+0 -35.3454 Td
+(2124 np->state = UNUSED;) 16.856 Tj
+0 -36.6545 Td
+(2125 return 0;) 10.836 Tj
+0 -37.9636 Td
+(2126 }) 4.816 Tj
+0 -39.2727 Td
+(2127 memmove\(np->mem, p->mem, np->sz\);) 24.08 Tj
+0 -40.5818 Td
+(2128 ) 3.01 Tj
+0 -41.8909 Td
+(2129 // Allocate kernel stack.) 19.264 Tj
+0 -43.2 Td
+(2130 np->kstack = kalloc\(KSTACKSIZE\);) 23.478 Tj
+0 -44.5091 Td
+(2131 if\(np->kstack == 0\){) 16.254 Tj
+0 -45.8182 Td
+(2132 kfree\(np->mem, np->sz\);) 19.264 Tj
+0 -47.1272 Td
+(2133 np->mem = 0;) 12.642 Tj
+0 -48.4363 Td
+(2134 np->state = UNUSED;) 16.856 Tj
+0 -49.7454 Td
+(2135 return 0;) 10.836 Tj
+0 -51.0545 Td
+(2136 }) 4.816 Tj
+0 -52.3636 Td
+(2137 ) 3.01 Tj
+0 -53.6727 Td
+(2138 // Copy trapframe registers from parent.) 28.294 Tj
+0 -54.9818 Td
+(2139 np->tf = \(struct trapframe*\)\(np->kstack + KSTACKSIZE\) - 1;) 39.13 Tj
+0 -56.2909 Td
+(2140 memmove\(np->tf, p->tf, sizeof\(*np->tf\)\);) 28.294 Tj
+0 -57.6 Td
+(2141 ) 3.01 Tj
+0 -58.9091 Td
+(2142 // Clear %eax so that fork system call returns 0 in child.) 39.13 Tj
+0 -60.2181 Td
+(2143 np->tf->eax = 0;) 13.846 Tj
+0 -61.5272 Td
+(2144 ) 3.01 Tj
+0 -62.8363 Td
+(2145 // Set up new jmpbuf to start executing at forkret \(see below\).) 42.14 Tj
+0 -64.1454 Td
+(2146 memset\(&np->jmpbuf, 0, sizeof np->jmpbuf\);) 29.498 Tj
+0 -65.4545 Td
+(2147 np->jmpbuf.eip = \(uint\)forkret;) 22.876 Tj
+0 -66.7636 Td
+(2148 np->jmpbuf.esp = \(uint\)np->tf - 4;) 24.682 Tj
+0 -68.0727 Td
+(2149 ) 3.01 Tj
+0 -72 Td
+(Sheet 21) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/proc.c Page 4) 22.274 Tj
+0 -3.92728 Td
+(2150 // Copy file descriptors) 18.662 Tj
+0 -5.23637 Td
+(2151 for\(i = 0; i < NOFILE; i++\){) 21.07 Tj
+0 -6.54546 Td
+(2152 np->ofile[i] = p->ofile[i];) 21.672 Tj
+0 -7.85455 Td
+(2153 if\(np->ofile[i]\)) 15.05 Tj
+0 -9.16364 Td
+(2154 fileincref\(np->ofile[i]\);) 21.672 Tj
+0 -10.4727 Td
+(2155 }) 4.816 Tj
+0 -11.7818 Td
+(2156 ) 3.01 Tj
+0 -13.0909 Td
+(2157 np->cwd = p->cwd;) 14.448 Tj
+0 -14.4 Td
+(2158 iincref\(p->cwd\);) 13.846 Tj
+0 -15.7091 Td
+(2159 ) 3.01 Tj
+0 -17.0182 Td
+(2160 return np;) 10.234 Tj
+0 -18.3273 Td
+(2161 }) 3.612 Tj
+0 -19.6364 Td
+(2162 ) 3.01 Tj
+0 -20.9455 Td
+(2163 ) 3.01 Tj
+0 -22.2545 Td
+(2164 ) 3.01 Tj
+0 -23.5636 Td
+(2165 ) 3.01 Tj
+0 -24.8727 Td
+(2166 ) 3.01 Tj
+0 -26.1818 Td
+(2167 ) 3.01 Tj
+0 -27.4909 Td
+(2168 ) 3.01 Tj
+0 -28.8 Td
+(2169 ) 3.01 Tj
+0 -30.1091 Td
+(2170 ) 3.01 Tj
+0 -31.4182 Td
+(2171 ) 3.01 Tj
+0 -32.7273 Td
+(2172 ) 3.01 Tj
+0 -34.0364 Td
+(2173 ) 3.01 Tj
+0 -35.3454 Td
+(2174 ) 3.01 Tj
+0 -36.6545 Td
+(2175 ) 3.01 Tj
+0 -37.9636 Td
+(2176 ) 3.01 Tj
+0 -39.2727 Td
+(2177 ) 3.01 Tj
+0 -40.5818 Td
+(2178 ) 3.01 Tj
+0 -41.8909 Td
+(2179 ) 3.01 Tj
+0 -43.2 Td
+(2180 ) 3.01 Tj
+0 -44.5091 Td
+(2181 ) 3.01 Tj
+0 -45.8182 Td
+(2182 ) 3.01 Tj
+0 -47.1272 Td
+(2183 ) 3.01 Tj
+0 -48.4363 Td
+(2184 ) 3.01 Tj
+0 -49.7454 Td
+(2185 ) 3.01 Tj
+0 -51.0545 Td
+(2186 ) 3.01 Tj
+0 -52.3636 Td
+(2187 ) 3.01 Tj
+0 -53.6727 Td
+(2188 ) 3.01 Tj
+0 -54.9818 Td
+(2189 ) 3.01 Tj
+0 -56.2909 Td
+(2190 ) 3.01 Tj
+0 -57.6 Td
+(2191 ) 3.01 Tj
+0 -58.9091 Td
+(2192 ) 3.01 Tj
+0 -60.2181 Td
+(2193 ) 3.01 Tj
+0 -61.5272 Td
+(2194 ) 3.01 Tj
+0 -62.8363 Td
+(2195 ) 3.01 Tj
+0 -64.1454 Td
+(2196 ) 3.01 Tj
+0 -65.4545 Td
+(2197 ) 3.01 Tj
+0 -66.7636 Td
+(2198 ) 3.01 Tj
+0 -68.0727 Td
+(2199 ) 3.01 Tj
+0 -72 Td
+(Sheet 21) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 29 29
+%%BeginPageSetup
+%%PageOrientation: Landscape
+pdfStartPage
+%%EndPageSetup
+[] 0 d
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+1 w
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+q
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+q
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+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
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+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/proc.c Page 5) 22.274 Tj
+0 -3.92728 Td
+(2200 // Per-CPU process scheduler.) 20.468 Tj
+0 -5.23637 Td
+(2201 // Each CPU calls scheduler\(\) after setting itself up.) 35.518 Tj
+0 -6.54546 Td
+(2202 // Scheduler never returns. It loops, doing:) 30.1 Tj
+0 -7.85455 Td
+(2203 // - choose a process to run) 20.468 Tj
+0 -9.16364 Td
+(2204 // - longjmp to start running that process) 28.896 Tj
+0 -10.4727 Td
+(2205 // - eventually that process transfers control back) 34.314 Tj
+0 -11.7818 Td
+(2206 // via longjmp back to the top of scheduler.) 32.508 Tj
+0 -13.0909 Td
+(2207 void) 5.418 Tj
+0 -14.4 Td
+(2208 scheduler\(void\)) 12.04 Tj
+0 -15.7091 Td
+(2209 {) 3.612 Tj
+0 -17.0182 Td
+(2210 struct proc *p;) 13.244 Tj
+0 -18.3273 Td
+(2211 int i;) 7.826 Tj
+0 -19.6364 Td
+(2212 ) 3.01 Tj
+0 -20.9455 Td
+(2213 for\(;;\){) 9.03 Tj
+0 -22.2545 Td
+(2214 // Loop over process table looking for process to run.) 37.926 Tj
+0 -23.5636 Td
+(2215 acquire\(&proc_table_lock\);) 21.07 Tj
+0 -24.8727 Td
+(2216 ) 3.01 Tj
+0 -26.1818 Td
+(2217 for\(i = 0; i < NPROC; i++\){) 21.672 Tj
+0 -27.4909 Td
+(2218 p = &proc[i];) 14.448 Tj
+0 -28.8 Td
+(2219 if\(p->state != RUNNABLE\)) 21.07 Tj
+0 -30.1091 Td
+(2220 continue;) 13.244 Tj
+0 -31.4182 Td
+(2221 ) 3.01 Tj
+0 -32.7273 Td
+(2222 // Switch to chosen process. It is the process's job) 38.528 Tj
+0 -34.0364 Td
+(2223 // to release proc_table_lock and then reacquire it) 37.324 Tj
+0 -35.3454 Td
+(2224 // before jumping back to us.) 24.08 Tj
+0 -36.6545 Td
+(2225 ) 3.01 Tj
+0 -37.9636 Td
+(2226 setupsegs\(p\);) 14.448 Tj
+0 -39.2727 Td
+(2227 curproc[cpu\(\)] = p;) 18.06 Tj
+0 -40.5818 Td
+(2228 p->state = RUNNING;) 18.06 Tj
+0 -41.8909 Td
+(2229 if\(setjmp\(&cpus[cpu\(\)].jmpbuf\) == 0\)) 28.294 Tj
+0 -43.2 Td
+(2230 longjmp\(&p->jmpbuf\);) 19.866 Tj
+0 -44.5091 Td
+(2231 ) 3.01 Tj
+0 -45.8182 Td
+(2232 // Process is done running for now.) 27.692 Tj
+0 -47.1272 Td
+(2233 // It should have changed its p->state before coming back.) 41.538 Tj
+0 -48.4363 Td
+(2234 curproc[cpu\(\)] = 0;) 18.06 Tj
+0 -49.7454 Td
+(2235 ) 3.01 Tj
+0 -51.0545 Td
+(2236 setupsegs\(0\);) 14.448 Tj
+0 -52.3636 Td
+(2237 }) 6.02 Tj
+0 -53.6727 Td
+(2238 ) 3.01 Tj
+0 -54.9818 Td
+(2239 release\(&proc_table_lock\);) 21.07 Tj
+0 -56.2909 Td
+(2240 }) 4.816 Tj
+0 -57.6 Td
+(2241 }) 3.612 Tj
+0 -58.9091 Td
+(2242 ) 3.01 Tj
+0 -60.2181 Td
+(2243 ) 3.01 Tj
+0 -61.5272 Td
+(2244 ) 3.01 Tj
+0 -62.8363 Td
+(2245 ) 3.01 Tj
+0 -64.1454 Td
+(2246 ) 3.01 Tj
+0 -65.4545 Td
+(2247 ) 3.01 Tj
+0 -66.7636 Td
+(2248 ) 3.01 Tj
+0 -68.0727 Td
+(2249 ) 3.01 Tj
+0 -72 Td
+(Sheet 22) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/proc.c Page 6) 22.274 Tj
+0 -3.92728 Td
+(2250 // Enter scheduler. Must already hold proc_table_lock) 35.518 Tj
+0 -5.23637 Td
+(2251 // and have changed curproc[cpu\(\)]->state.) 28.294 Tj
+0 -6.54546 Td
+(2252 void) 5.418 Tj
+0 -7.85455 Td
+(2253 sched\(void\)) 9.632 Tj
+0 -9.16364 Td
+(2254 {) 3.612 Tj
+0 -10.4727 Td
+(2255 struct proc *p = curproc[cpu\(\)];) 23.478 Tj
+0 -11.7818 Td
+(2256 ) 3.01 Tj
+0 -13.0909 Td
+(2257 if\(!holding\(&proc_table_lock\)\)) 22.274 Tj
+0 -14.4 Td
+(2258 panic\("sched"\);) 14.448 Tj
+0 -15.7091 Td
+(2259 if\(cpus[cpu\(\)].nlock != 1\)) 19.866 Tj
+0 -17.0182 Td
+(2260 panic\("sched locks"\);) 18.06 Tj
+0 -18.3273 Td
+(2261 ) 3.01 Tj
+0 -19.6364 Td
+(2262 if\(setjmp\(&p->jmpbuf\) == 0\)) 20.468 Tj
+0 -20.9455 Td
+(2263 longjmp\(&cpus[cpu\(\)].jmpbuf\);) 22.876 Tj
+0 -22.2545 Td
+(2264 }) 3.612 Tj
+0 -23.5636 Td
+(2265 ) 3.01 Tj
+0 -24.8727 Td
+(2266 // Give up the CPU for one scheduling round.) 29.498 Tj
+0 -26.1818 Td
+(2267 void) 5.418 Tj
+0 -27.4909 Td
+(2268 yield\(void\)) 9.632 Tj
+0 -28.8 Td
+(2269 {) 3.612 Tj
+0 -30.1091 Td
+(2270 struct proc *p = curproc[cpu\(\)];) 23.478 Tj
+0 -31.4182 Td
+(2271 ) 3.01 Tj
+0 -32.7273 Td
+(2272 acquire\(&proc_table_lock\);) 19.866 Tj
+0 -34.0364 Td
+(2273 p->state = RUNNABLE;) 16.254 Tj
+0 -35.3454 Td
+(2274 sched\(\);) 9.03 Tj
+0 -36.6545 Td
+(2275 release\(&proc_table_lock\);) 19.866 Tj
+0 -37.9636 Td
+(2276 }) 3.612 Tj
+0 -39.2727 Td
+(2277 ) 3.01 Tj
+0 -40.5818 Td
+(2278 // A fork child's very first scheduling by scheduler\(\)) 35.518 Tj
+0 -41.8909 Td
+(2279 // will longjmp here. "return" to user space.) 30.1 Tj
+0 -43.2 Td
+(2280 void) 5.418 Tj
+0 -44.5091 Td
+(2281 forkret\(void\)) 10.836 Tj
+0 -45.8182 Td
+(2282 {) 3.612 Tj
+0 -47.1272 Td
+(2283 // Still holding proc_table_lock from scheduler.) 33.11 Tj
+0 -48.4363 Td
+(2284 release\(&proc_table_lock\);) 19.866 Tj
+0 -49.7454 Td
+(2285 ) 3.01 Tj
+0 -51.0545 Td
+(2286 // Jump into assembly, never to return.) 27.692 Tj
+0 -52.3636 Td
+(2287 forkret1\(curproc[cpu\(\)]->tf\);) 21.672 Tj
+0 -53.6727 Td
+(2288 }) 3.612 Tj
+0 -54.9818 Td
+(2289 ) 3.01 Tj
+0 -56.2909 Td
+(2290 ) 3.01 Tj
+0 -57.6 Td
+(2291 ) 3.01 Tj
+0 -58.9091 Td
+(2292 ) 3.01 Tj
+0 -60.2181 Td
+(2293 ) 3.01 Tj
+0 -61.5272 Td
+(2294 ) 3.01 Tj
+0 -62.8363 Td
+(2295 ) 3.01 Tj
+0 -64.1454 Td
+(2296 ) 3.01 Tj
+0 -65.4545 Td
+(2297 ) 3.01 Tj
+0 -66.7636 Td
+(2298 ) 3.01 Tj
+0 -68.0727 Td
+(2299 ) 3.01 Tj
+0 -72 Td
+(Sheet 22) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 30 30
+%%BeginPageSetup
+%%PageOrientation: Landscape
+__tumble pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
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+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/proc.c Page 7) 22.274 Tj
+0 -3.92728 Td
+(2300 // Atomically release lock and sleep on chan.) 30.1 Tj
+0 -5.23637 Td
+(2301 // Reacquires lock when reawakened.) 24.08 Tj
+0 -6.54546 Td
+(2302 void) 5.418 Tj
+0 -7.85455 Td
+(2303 sleep\(void *chan, struct spinlock *lk\)) 25.886 Tj
+0 -9.16364 Td
+(2304 {) 3.612 Tj
+0 -10.4727 Td
+(2305 struct proc *p = curproc[cpu\(\)];) 23.478 Tj
+0 -11.7818 Td
+(2306 ) 3.01 Tj
+0 -13.0909 Td
+(2307 if\(p == 0\)) 10.234 Tj
+0 -14.4 Td
+(2308 panic\("sleep"\);) 14.448 Tj
+0 -15.7091 Td
+(2309 ) 3.01 Tj
+0 -17.0182 Td
+(2310 if\(lk == 0\)) 10.836 Tj
+0 -18.3273 Td
+(2311 panic\("sleep without lk"\);) 21.07 Tj
+0 -19.6364 Td
+(2312 ) 3.01 Tj
+0 -20.9455 Td
+(2313 // Must acquire proc_table_lock in order to) 30.1 Tj
+0 -22.2545 Td
+(2314 // change p->state and then call sched.) 27.692 Tj
+0 -23.5636 Td
+(2315 // Once we hold proc_table_lock, we can be) 29.498 Tj
+0 -24.8727 Td
+(2316 // guaranteed that we won't miss any wakeup) 30.1 Tj
+0 -26.1818 Td
+(2317 // \(wakeup runs with proc_table_lock locked\),) 31.304 Tj
+0 -27.4909 Td
+(2318 // so it's okay to release lk.) 22.274 Tj
+0 -28.8 Td
+(2319 if\(lk != &proc_table_lock\){) 20.468 Tj
+0 -30.1091 Td
+(2320 acquire\(&proc_table_lock\);) 21.07 Tj
+0 -31.4182 Td
+(2321 release\(lk\);) 12.642 Tj
+0 -32.7273 Td
+(2322 }) 4.816 Tj
+0 -34.0364 Td
+(2323 ) 3.01 Tj
+0 -35.3454 Td
+(2324 // Go to sleep.) 13.244 Tj
+0 -36.6545 Td
+(2325 p->chan = chan;) 13.244 Tj
+0 -37.9636 Td
+(2326 p->state = SLEEPING;) 16.254 Tj
+0 -39.2727 Td
+(2327 sched\(\);) 9.03 Tj
+0 -40.5818 Td
+(2328 ) 3.01 Tj
+0 -41.8909 Td
+(2329 // Tidy up.) 10.836 Tj
+0 -43.2 Td
+(2330 p->chan = 0;) 11.438 Tj
+0 -44.5091 Td
+(2331 ) 3.01 Tj
+0 -45.8182 Td
+(2332 // Reacquire original lock.) 20.468 Tj
+0 -47.1272 Td
+(2333 if\(lk != &proc_table_lock\){) 20.468 Tj
+0 -48.4363 Td
+(2334 release\(&proc_table_lock\);) 21.07 Tj
+0 -49.7454 Td
+(2335 acquire\(lk\);) 12.642 Tj
+0 -51.0545 Td
+(2336 }) 4.816 Tj
+0 -52.3636 Td
+(2337 }) 3.612 Tj
+0 -53.6727 Td
+(2338 ) 3.01 Tj
+0 -54.9818 Td
+(2339 // Wake up all processes sleeping on chan.) 28.294 Tj
+0 -56.2909 Td
+(2340 // Proc_table_lock must be held.) 22.274 Tj
+0 -57.6 Td
+(2341 void) 5.418 Tj
+0 -58.9091 Td
+(2342 wakeup1\(void *chan\)) 14.448 Tj
+0 -60.2181 Td
+(2343 {) 3.612 Tj
+0 -61.5272 Td
+(2344 struct proc *p;) 13.244 Tj
+0 -62.8363 Td
+(2345 ) 3.01 Tj
+0 -64.1454 Td
+(2346 for\(p = proc; p < &proc[NPROC]; p++\)) 25.886 Tj
+0 -65.4545 Td
+(2347 if\(p->state == SLEEPING && p->chan == chan\)) 31.304 Tj
+0 -66.7636 Td
+(2348 p->state = RUNNABLE;) 18.662 Tj
+0 -68.0727 Td
+(2349 }) 3.612 Tj
+0 -72 Td
+(Sheet 23) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/proc.c Page 8) 22.274 Tj
+0 -3.92728 Td
+(2350 // Wake up all processes sleeping on chan.) 28.294 Tj
+0 -5.23637 Td
+(2351 // Proc_table_lock is acquired and released.) 29.498 Tj
+0 -6.54546 Td
+(2352 void) 5.418 Tj
+0 -7.85455 Td
+(2353 wakeup\(void *chan\)) 13.846 Tj
+0 -9.16364 Td
+(2354 {) 3.612 Tj
+0 -10.4727 Td
+(2355 acquire\(&proc_table_lock\);) 19.866 Tj
+0 -11.7818 Td
+(2356 wakeup1\(chan\);) 12.642 Tj
+0 -13.0909 Td
+(2357 release\(&proc_table_lock\);) 19.866 Tj
+0 -14.4 Td
+(2358 }) 3.612 Tj
+0 -15.7091 Td
+(2359 ) 3.01 Tj
+0 -17.0182 Td
+(2360 // Kill the process with the given pid.) 26.488 Tj
+0 -18.3273 Td
+(2361 // Process won't actually exit until it returns) 31.304 Tj
+0 -19.6364 Td
+(2362 // to user space \(see trap in trap.c\).) 25.886 Tj
+0 -20.9455 Td
+(2363 int) 4.816 Tj
+0 -22.2545 Td
+(2364 proc_kill\(int pid\)) 13.846 Tj
+0 -23.5636 Td
+(2365 {) 3.612 Tj
+0 -24.8727 Td
+(2366 struct proc *p;) 13.244 Tj
+0 -26.1818 Td
+(2367 ) 3.01 Tj
+0 -27.4909 Td
+(2368 acquire\(&proc_table_lock\);) 19.866 Tj
+0 -28.8 Td
+(2369 for\(p = proc; p < &proc[NPROC]; p++\){) 26.488 Tj
+0 -30.1091 Td
+(2370 if\(p->pid == pid\){) 16.254 Tj
+0 -31.4182 Td
+(2371 p->killed = 1;) 15.05 Tj
+0 -32.7273 Td
+(2372 // Wake process from sleep if necessary.) 30.702 Tj
+0 -34.0364 Td
+(2373 if\(p->state == SLEEPING\)) 21.07 Tj
+0 -35.3454 Td
+(2374 p->state = RUNNABLE;) 19.866 Tj
+0 -36.6545 Td
+(2375 release\(&proc_table_lock\);) 22.274 Tj
+0 -37.9636 Td
+(2376 return 0;) 12.04 Tj
+0 -39.2727 Td
+(2377 }) 6.02 Tj
+0 -40.5818 Td
+(2378 }) 4.816 Tj
+0 -41.8909 Td
+(2379 release\(&proc_table_lock\);) 19.866 Tj
+0 -43.2 Td
+(2380 return -1;) 10.234 Tj
+0 -44.5091 Td
+(2381 }) 3.612 Tj
+0 -45.8182 Td
+(2382 ) 3.01 Tj
+0 -47.1272 Td
+(2383 // Exit the current process. Does not return.) 30.702 Tj
+0 -48.4363 Td
+(2384 // Exited processes remain in the zombie state) 30.702 Tj
+0 -49.7454 Td
+(2385 // until their parent calls wait\(\) to find out they exited.) 38.528 Tj
+0 -51.0545 Td
+(2386 void) 5.418 Tj
+0 -52.3636 Td
+(2387 proc_exit\(void\)) 12.04 Tj
+0 -53.6727 Td
+(2388 {) 3.612 Tj
+0 -54.9818 Td
+(2389 struct proc *p;) 13.244 Tj
+0 -56.2909 Td
+(2390 struct proc *cp = curproc[cpu\(\)];) 24.08 Tj
+0 -57.6 Td
+(2391 int fd;) 8.428 Tj
+0 -58.9091 Td
+(2392 ) 3.01 Tj
+0 -60.2181 Td
+(2393 // Close all open files.) 18.662 Tj
+0 -61.5272 Td
+(2394 for\(fd = 0; fd < NOFILE; fd++\){) 22.876 Tj
+0 -62.8363 Td
+(2395 if\(cp->ofile[fd]\){) 16.254 Tj
+0 -64.1454 Td
+(2396 fileclose\(cp->ofile[fd]\);) 21.672 Tj
+0 -65.4545 Td
+(2397 cp->ofile[fd] = 0;) 17.458 Tj
+0 -66.7636 Td
+(2398 }) 6.02 Tj
+0 -68.0727 Td
+(2399 }) 4.816 Tj
+0 -72 Td
+(Sheet 23) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 31 31
+%%BeginPageSetup
+%%PageOrientation: Landscape
+pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/proc.c Page 9) 22.274 Tj
+0 -3.92728 Td
+(2400 idecref\(cp->cwd\);) 14.448 Tj
+0 -5.23637 Td
+(2401 cp->cwd = 0;) 11.438 Tj
+0 -6.54546 Td
+(2402 ) 3.01 Tj
+0 -7.85455 Td
+(2403 acquire\(&proc_table_lock\);) 19.866 Tj
+0 -9.16364 Td
+(2404 ) 3.01 Tj
+0 -10.4727 Td
+(2405 // Wake up our parent.) 17.458 Tj
+0 -11.7818 Td
+(2406 for\(p = proc; p < &proc[NPROC]; p++\)) 25.886 Tj
+0 -13.0909 Td
+(2407 if\(p->pid == cp->ppid\)) 18.662 Tj
+0 -14.4 Td
+(2408 wakeup1\(p\);) 13.244 Tj
+0 -15.7091 Td
+(2409 ) 3.01 Tj
+0 -17.0182 Td
+(2410 // Reparent our children to process 1.) 27.09 Tj
+0 -18.3273 Td
+(2411 for\(p = proc; p < &proc[NPROC]; p++\)) 25.886 Tj
+0 -19.6364 Td
+(2412 if\(p->ppid == cp->pid\)) 18.662 Tj
+0 -20.9455 Td
+(2413 p->ppid = 1;) 13.846 Tj
+0 -22.2545 Td
+(2414 ) 3.01 Tj
+0 -23.5636 Td
+(2415 // Jump into the scheduler, never to return.) 30.702 Tj
+0 -24.8727 Td
+(2416 cp->killed = 0;) 13.244 Tj
+0 -26.1818 Td
+(2417 cp->state = ZOMBIE;) 15.652 Tj
+0 -27.4909 Td
+(2418 sched\(\);) 9.03 Tj
+0 -28.8 Td
+(2419 panic\("zombie exit"\);) 16.856 Tj
+0 -30.1091 Td
+(2420 }) 3.612 Tj
+0 -31.4182 Td
+(2421 ) 3.01 Tj
+0 -32.7273 Td
+(2422 // Wait for a child process to exit and return its pid.) 36.12 Tj
+0 -34.0364 Td
+(2423 // Return -1 if this process has no children.) 30.1 Tj
+0 -35.3454 Td
+(2424 int) 4.816 Tj
+0 -36.6545 Td
+(2425 proc_wait\(void\)) 12.04 Tj
+0 -37.9636 Td
+(2426 {) 3.612 Tj
+0 -39.2727 Td
+(2427 struct proc *p;) 13.244 Tj
+0 -40.5818 Td
+(2428 struct proc *cp = curproc[cpu\(\)];) 24.08 Tj
+0 -41.8909 Td
+(2429 int i, havekids, pid;) 16.856 Tj
+0 -43.2 Td
+(2430 ) 3.01 Tj
+0 -44.5091 Td
+(2431 acquire\(&proc_table_lock\);) 19.866 Tj
+0 -45.8182 Td
+(2432 for\(;;\){) 9.03 Tj
+0 -47.1272 Td
+(2433 // Scan through table looking for zombie children.) 35.518 Tj
+0 -48.4363 Td
+(2434 havekids = 0;) 13.244 Tj
+0 -49.7454 Td
+(2435 for\(i = 0; i < NPROC; i++\){) 21.672 Tj
+0 -51.0545 Td
+(2436 p = &proc[i];) 14.448 Tj
+0 -52.3636 Td
+(2437 if\(p->state == UNUSED\)) 19.866 Tj
+0 -53.6727 Td
+(2438 continue;) 13.244 Tj
+0 -54.9818 Td
+(2439 if\(p->ppid == cp->pid\){) 20.468 Tj
+0 -56.2909 Td
+(2440 if\(p->state == ZOMBIE\){) 21.672 Tj
+0 -57.6 Td
+(2441 // Found one.) 16.856 Tj
+0 -58.9091 Td
+(2442 kfree\(p->mem, p->sz\);) 21.672 Tj
+0 -60.2181 Td
+(2443 kfree\(p->kstack, KSTACKSIZE\);) 26.488 Tj
+0 -61.5272 Td
+(2444 pid = p->pid;) 16.856 Tj
+0 -62.8363 Td
+(2445 p->state = UNUSED;) 19.866 Tj
+0 -64.1454 Td
+(2446 p->pid = 0;) 15.652 Tj
+0 -65.4545 Td
+(2447 p->ppid = 0;) 16.254 Tj
+0 -66.7636 Td
+(2448 release\(&proc_table_lock\);) 24.682 Tj
+0 -68.0727 Td
+(2449 return pid;) 15.652 Tj
+0 -72 Td
+(Sheet 24) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/proc.c Page 10) 22.876 Tj
+0 -3.92728 Td
+(2450 }) 8.428 Tj
+0 -5.23637 Td
+(2451 havekids = 1;) 15.652 Tj
+0 -6.54546 Td
+(2452 }) 7.224 Tj
+0 -7.85455 Td
+(2453 }) 6.02 Tj
+0 -9.16364 Td
+(2454 ) 3.01 Tj
+0 -10.4727 Td
+(2455 // No point waiting if we don't have any children.) 35.518 Tj
+0 -11.7818 Td
+(2456 if\(!havekids\){) 13.846 Tj
+0 -13.0909 Td
+(2457 release\(&proc_table_lock\);) 22.274 Tj
+0 -14.4 Td
+(2458 return -1;) 12.642 Tj
+0 -15.7091 Td
+(2459 }) 6.02 Tj
+0 -17.0182 Td
+(2460 ) 3.01 Tj
+0 -18.3273 Td
+(2461 // Wait for children to exit. \(See wakeup1 call in proc_exit.\)) 43.344 Tj
+0 -19.6364 Td
+(2462 sleep\(cp, &proc_table_lock\);) 22.274 Tj
+0 -20.9455 Td
+(2463 }) 4.816 Tj
+0 -22.2545 Td
+(2464 }) 3.612 Tj
+0 -23.5636 Td
+(2465 ) 3.01 Tj
+0 -24.8727 Td
+(2466 // Print a process listing to console. For debugging.) 35.518 Tj
+0 -26.1818 Td
+(2467 // Runs when user types ^P on console.) 25.886 Tj
+0 -27.4909 Td
+(2468 // No lock to avoid wedging a stuck machine further.) 34.314 Tj
+0 -28.8 Td
+(2469 void) 5.418 Tj
+0 -30.1091 Td
+(2470 procdump\(void\)) 11.438 Tj
+0 -31.4182 Td
+(2471 {) 3.612 Tj
+0 -32.7273 Td
+(2472 int i;) 7.826 Tj
+0 -34.0364 Td
+(2473 struct proc *p;) 13.244 Tj
+0 -35.3454 Td
+(2474 ) 3.01 Tj
+0 -36.6545 Td
+(2475 for\(i = 0; i < NPROC; i++\) {) 21.07 Tj
+0 -37.9636 Td
+(2476 p = &proc[i];) 13.244 Tj
+0 -39.2727 Td
+(2477 if\(p->state == UNUSED\)) 18.662 Tj
+0 -40.5818 Td
+(2478 continue;) 12.04 Tj
+0 -41.8909 Td
+(2479 cprintf\("%d %d %p\\n", p->pid, p->state\);) 29.498 Tj
+0 -43.2 Td
+(2480 }) 4.816 Tj
+0 -44.5091 Td
+(2481 }) 3.612 Tj
+0 -45.8182 Td
+(2482 ) 3.01 Tj
+0 -47.1272 Td
+(2483 ) 3.01 Tj
+0 -48.4363 Td
+(2484 ) 3.01 Tj
+0 -49.7454 Td
+(2485 ) 3.01 Tj
+0 -51.0545 Td
+(2486 ) 3.01 Tj
+0 -52.3636 Td
+(2487 ) 3.01 Tj
+0 -53.6727 Td
+(2488 ) 3.01 Tj
+0 -54.9818 Td
+(2489 ) 3.01 Tj
+0 -56.2909 Td
+(2490 ) 3.01 Tj
+0 -57.6 Td
+(2491 ) 3.01 Tj
+0 -58.9091 Td
+(2492 ) 3.01 Tj
+0 -60.2181 Td
+(2493 ) 3.01 Tj
+0 -61.5272 Td
+(2494 ) 3.01 Tj
+0 -62.8363 Td
+(2495 ) 3.01 Tj
+0 -64.1454 Td
+(2496 ) 3.01 Tj
+0 -65.4545 Td
+(2497 ) 3.01 Tj
+0 -66.7636 Td
+(2498 ) 3.01 Tj
+0 -68.0727 Td
+(2499 ) 3.01 Tj
+0 -72 Td
+(Sheet 24) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 32 32
+%%BeginPageSetup
+%%PageOrientation: Landscape
+__tumble pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/setjmp.S Page 1) 23.478 Tj
+0 -3.92728 Td
+(2500 # int setjmp\(struct jmpbuf *jmp\);) 24.682 Tj
+0 -5.23637 Td
+(2501 # void longjmp\(struct jmpbuf *jmp\);) 25.284 Tj
+0 -6.54546 Td
+(2502 #) 3.612 Tj
+0 -7.85455 Td
+(2503 # Setjmp saves its stack environment in jmp for later use by longjmp.) 44.548 Tj
+0 -9.16364 Td
+(2504 # It returns 0.) 12.04 Tj
+0 -10.4727 Td
+(2505 #) 3.612 Tj
+0 -11.7818 Td
+(2506 # Longjmp restores the environment saved by the last call of setjmp.) 43.946 Tj
+0 -13.0909 Td
+(2507 # It then causes execution to continue as if the call of setjmp) 40.936 Tj
+0 -14.4 Td
+(2508 # had just returned 1.) 16.254 Tj
+0 -15.7091 Td
+(2509 #) 3.612 Tj
+0 -17.0182 Td
+(2510 # The caller of setjmp must not itself have returned in the interim.) 43.946 Tj
+0 -18.3273 Td
+(2511 # All accessible data have values as of the time longjmp was called.) 43.946 Tj
+0 -19.6364 Td
+(2512 #) 3.612 Tj
+0 -20.9455 Td
+(2513 # [Description, but not code, borrowed from Plan 9.]) 36.12 Tj
+0 -22.2545 Td
+(2514 ) 3.01 Tj
+0 -23.5636 Td
+(2515 .globl setjmp) 10.836 Tj
+0 -24.8727 Td
+(2516 setjmp:) 7.224 Tj
+0 -26.1818 Td
+(2517 movl 4\(%esp\), %eax) 15.05 Tj
+0 -27.4909 Td
+(2518 ) 3.01 Tj
+0 -28.8 Td
+(2519 movl %ebx, 0\(%eax\)) 15.05 Tj
+0 -30.1091 Td
+(2520 movl %ecx, 4\(%eax\)) 15.05 Tj
+0 -31.4182 Td
+(2521 movl %edx, 8\(%eax\)) 15.05 Tj
+0 -32.7273 Td
+(2522 movl %esi, 12\(%eax\)) 15.652 Tj
+0 -34.0364 Td
+(2523 movl %edi, 16\(%eax\)) 15.652 Tj
+0 -35.3454 Td
+(2524 movl %esp, 20\(%eax\)) 15.652 Tj
+0 -36.6545 Td
+(2525 movl %ebp, 24\(%eax\)) 15.652 Tj
+0 -37.9636 Td
+(2526 pushl 0\(%esp\) # %eip) 17.458 Tj
+0 -39.2727 Td
+(2527 popl 28\(%eax\)) 12.04 Tj
+0 -40.5818 Td
+(2528 ) 3.01 Tj
+0 -41.8909 Td
+(2529 movl $0, %eax # return value) 22.274 Tj
+0 -43.2 Td
+(2530 ret) 6.02 Tj
+0 -44.5091 Td
+(2531 ) 3.01 Tj
+0 -45.8182 Td
+(2532 .globl longjmp) 11.438 Tj
+0 -47.1272 Td
+(2533 longjmp:) 7.826 Tj
+0 -48.4363 Td
+(2534 movl 4\(%esp\), %eax) 15.05 Tj
+0 -49.7454 Td
+(2535 ) 3.01 Tj
+0 -51.0545 Td
+(2536 movl 0\(%eax\), %ebx) 15.05 Tj
+0 -52.3636 Td
+(2537 movl 4\(%eax\), %ecx) 15.05 Tj
+0 -53.6727 Td
+(2538 movl 8\(%eax\), %edx) 15.05 Tj
+0 -54.9818 Td
+(2539 movl 12\(%eax\), %esi) 15.652 Tj
+0 -56.2909 Td
+(2540 movl 16\(%eax\), %edi) 15.652 Tj
+0 -57.6 Td
+(2541 movl 20\(%eax\), %esp) 15.652 Tj
+0 -58.9091 Td
+(2542 movl 24\(%eax\), %ebp) 15.652 Tj
+0 -60.2181 Td
+(2543 ) 3.01 Tj
+0 -61.5272 Td
+(2544 addl $4, %esp # pop and discard %eip) 27.09 Tj
+0 -62.8363 Td
+(2545 pushl 28\(%eax\) # push new %eip) 22.876 Tj
+0 -64.1454 Td
+(2546 ) 3.01 Tj
+0 -65.4545 Td
+(2547 movl $1, %eax # return value \(appears to come from setjmp!\)) 40.936 Tj
+0 -66.7636 Td
+(2548 ret) 6.02 Tj
+0 -68.0727 Td
+(2549 ) 3.01 Tj
+0 -72 Td
+(Sheet 25) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/kalloc.c Page 1) 23.478 Tj
+0 -3.92728 Td
+(2550 // Physical memory allocator, intended to allocate) 33.11 Tj
+0 -5.23637 Td
+(2551 // memory for user processes. Allocates in 4096-byte "pages".) 39.732 Tj
+0 -6.54546 Td
+(2552 // Free list is kept sorted and combines adjacent pages into) 39.13 Tj
+0 -7.85455 Td
+(2553 // long runs, to make it easier to allocate big segments.) 37.324 Tj
+0 -9.16364 Td
+(2554 // One reason the page size is 4k is that the x86 segment size) 40.334 Tj
+0 -10.4727 Td
+(2555 // granularity is 4k.) 15.652 Tj
+0 -11.7818 Td
+(2556 ) 3.01 Tj
+0 -13.0909 Td
+(2557 #include "param.h") 13.846 Tj
+0 -14.4 Td
+(2558 #include "types.h") 13.846 Tj
+0 -15.7091 Td
+(2559 #include "defs.h") 13.244 Tj
+0 -17.0182 Td
+(2560 #include "param.h") 13.846 Tj
+0 -18.3273 Td
+(2561 #include "mmu.h") 12.642 Tj
+0 -19.6364 Td
+(2562 #include "proc.h") 13.244 Tj
+0 -20.9455 Td
+(2563 #include "spinlock.h") 15.652 Tj
+0 -22.2545 Td
+(2564 ) 3.01 Tj
+0 -23.5636 Td
+(2565 struct spinlock kalloc_lock;) 19.866 Tj
+0 -24.8727 Td
+(2566 ) 3.01 Tj
+0 -26.1818 Td
+(2567 struct run {) 10.234 Tj
+0 -27.4909 Td
+(2568 struct run *next;) 14.448 Tj
+0 -28.8 Td
+(2569 int len; // bytes) 14.448 Tj
+0 -30.1091 Td
+(2570 };) 4.214 Tj
+0 -31.4182 Td
+(2571 struct run *freelist;) 15.652 Tj
+0 -32.7273 Td
+(2572 ) 3.01 Tj
+0 -34.0364 Td
+(2573 // Initialize free list of physical pages.) 28.294 Tj
+0 -35.3454 Td
+(2574 // This code cheats by just considering one megabyte of) 36.12 Tj
+0 -36.6545 Td
+(2575 // pages after _end. Real systems would determine the) 35.518 Tj
+0 -37.9636 Td
+(2576 // amount of memory available in the system and use it all.) 38.528 Tj
+0 -39.2727 Td
+(2577 void) 5.418 Tj
+0 -40.5818 Td
+(2578 kinit\(void\)) 9.632 Tj
+0 -41.8909 Td
+(2579 {) 3.612 Tj
+0 -43.2 Td
+(2580 extern int end;) 13.244 Tj
+0 -44.5091 Td
+(2581 uint mem;) 9.632 Tj
+0 -45.8182 Td
+(2582 char *start;) 11.438 Tj
+0 -47.1272 Td
+(2583 ) 3.01 Tj
+0 -48.4363 Td
+(2584 initlock\(&kalloc_lock, "kalloc"\);) 24.08 Tj
+0 -49.7454 Td
+(2585 start = \(char*\) &end;) 16.856 Tj
+0 -51.0545 Td
+(2586 start = \(char*\) \(\(\(uint\)start + PAGE\) & ~\(PAGE-1\)\);) 34.916 Tj
+0 -52.3636 Td
+(2587 mem = 256; // assume computer has 256 pages of RAM) 34.314 Tj
+0 -53.6727 Td
+(2588 cprintf\("mem = %d\\n", mem * PAGE\);) 24.682 Tj
+0 -54.9818 Td
+(2589 kfree\(start, mem * PAGE\);) 19.264 Tj
+0 -56.2909 Td
+(2590 }) 3.612 Tj
+0 -57.6 Td
+(2591 ) 3.01 Tj
+0 -58.9091 Td
+(2592 ) 3.01 Tj
+0 -60.2181 Td
+(2593 ) 3.01 Tj
+0 -61.5272 Td
+(2594 ) 3.01 Tj
+0 -62.8363 Td
+(2595 ) 3.01 Tj
+0 -64.1454 Td
+(2596 ) 3.01 Tj
+0 -65.4545 Td
+(2597 ) 3.01 Tj
+0 -66.7636 Td
+(2598 ) 3.01 Tj
+0 -68.0727 Td
+(2599 ) 3.01 Tj
+0 -72 Td
+(Sheet 25) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 33 33
+%%BeginPageSetup
+%%PageOrientation: Landscape
+pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/kalloc.c Page 2) 23.478 Tj
+0 -3.92728 Td
+(2600 // Free the len bytes of memory pointed at by cp,) 32.508 Tj
+0 -5.23637 Td
+(2601 // which normally should have been returned by a) 31.906 Tj
+0 -6.54546 Td
+(2602 // call to kalloc\(cp\). \(The exception is when) 30.702 Tj
+0 -7.85455 Td
+(2603 // initializing the allocator; see kinit above.\)) 31.906 Tj
+0 -9.16364 Td
+(2604 void) 5.418 Tj
+0 -10.4727 Td
+(2605 kfree\(char *cp, int len\)) 17.458 Tj
+0 -11.7818 Td
+(2606 {) 3.612 Tj
+0 -13.0909 Td
+(2607 struct run **rr;) 13.846 Tj
+0 -14.4 Td
+(2608 struct run *p = \(struct run*\) cp;) 24.08 Tj
+0 -15.7091 Td
+(2609 struct run *pend = \(struct run*\) \(cp + len\);) 30.702 Tj
+0 -17.0182 Td
+(2610 int i;) 7.826 Tj
+0 -18.3273 Td
+(2611 ) 3.01 Tj
+0 -19.6364 Td
+(2612 if\(len % PAGE\)) 12.642 Tj
+0 -20.9455 Td
+(2613 panic\("kfree"\);) 14.448 Tj
+0 -22.2545 Td
+(2614 ) 3.01 Tj
+0 -23.5636 Td
+(2615 // Fill with junk to catch dangling refs.) 28.896 Tj
+0 -24.8727 Td
+(2616 for\(i = 0; i < len; i++\)) 18.662 Tj
+0 -26.1818 Td
+(2617 cp[i] = 1;) 11.438 Tj
+0 -27.4909 Td
+(2618 ) 3.01 Tj
+0 -28.8 Td
+(2619 acquire\(&kalloc_lock\);) 17.458 Tj
+0 -30.1091 Td
+(2620 ) 3.01 Tj
+0 -31.4182 Td
+(2621 rr = &freelist;) 13.244 Tj
+0 -32.7273 Td
+(2622 while\(*rr\){) 10.836 Tj
+0 -34.0364 Td
+(2623 struct run *rend = \(struct run*\) \(\(char*\)\(*rr\) + \(*rr\)->len\);) 42.14 Tj
+0 -35.3454 Td
+(2624 if\(p >= *rr && p < rend\)) 19.866 Tj
+0 -36.6545 Td
+(2625 panic\("freeing free page"\);) 22.876 Tj
+0 -37.9636 Td
+(2626 if\(pend == *rr\){) 15.05 Tj
+0 -39.2727 Td
+(2627 p->len = len + \(*rr\)->len;) 22.274 Tj
+0 -40.5818 Td
+(2628 p->next = \(*rr\)->next;) 19.866 Tj
+0 -41.8909 Td
+(2629 *rr = p;) 11.438 Tj
+0 -43.2 Td
+(2630 goto out;) 12.04 Tj
+0 -44.5091 Td
+(2631 }) 6.02 Tj
+0 -45.8182 Td
+(2632 if\(pend < *rr\){) 14.448 Tj
+0 -47.1272 Td
+(2633 p->len = len;) 14.448 Tj
+0 -48.4363 Td
+(2634 p->next = *rr;) 15.05 Tj
+0 -49.7454 Td
+(2635 *rr = p;) 11.438 Tj
+0 -51.0545 Td
+(2636 goto out;) 12.04 Tj
+0 -52.3636 Td
+(2637 }) 6.02 Tj
+0 -53.6727 Td
+(2638 if\(p == rend\){) 13.846 Tj
+0 -54.9818 Td
+(2639 \(*rr\)->len += len;) 17.458 Tj
+0 -56.2909 Td
+(2640 if\(\(*rr\)->next && \(*rr\)->next == pend\){) 30.1 Tj
+0 -57.6 Td
+(2641 \(*rr\)->len += \(*rr\)->next->len;) 26.488 Tj
+0 -58.9091 Td
+(2642 \(*rr\)->next = \(*rr\)->next->next;) 27.09 Tj
+0 -60.2181 Td
+(2643 }) 7.224 Tj
+0 -61.5272 Td
+(2644 goto out;) 12.04 Tj
+0 -62.8363 Td
+(2645 }) 6.02 Tj
+0 -64.1454 Td
+(2646 rr = &\(\(*rr\)->next\);) 17.458 Tj
+0 -65.4545 Td
+(2647 }) 4.816 Tj
+0 -66.7636 Td
+(2648 p->len = len;) 12.04 Tj
+0 -68.0727 Td
+(2649 p->next = 0;) 11.438 Tj
+0 -72 Td
+(Sheet 26) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/kalloc.c Page 3) 23.478 Tj
+0 -3.92728 Td
+(2650 *rr = p;) 9.03 Tj
+0 -5.23637 Td
+(2651 ) 3.01 Tj
+0 -6.54546 Td
+(2652 out:) 6.02 Tj
+0 -7.85455 Td
+(2653 release\(&kalloc_lock\);) 17.458 Tj
+0 -9.16364 Td
+(2654 }) 3.612 Tj
+0 -10.4727 Td
+(2655 ) 3.01 Tj
+0 -11.7818 Td
+(2656 // Allocate n bytes of physical memory.) 26.488 Tj
+0 -13.0909 Td
+(2657 // Returns a kernel-segment pointer.) 24.682 Tj
+0 -14.4 Td
+(2658 // Returns 0 if the memory cannot be allocated.) 31.304 Tj
+0 -15.7091 Td
+(2659 char*) 6.02 Tj
+0 -17.0182 Td
+(2660 kalloc\(int n\)) 10.836 Tj
+0 -18.3273 Td
+(2661 {) 3.612 Tj
+0 -19.6364 Td
+(2662 struct run **rr;) 13.846 Tj
+0 -20.9455 Td
+(2663 ) 3.01 Tj
+0 -22.2545 Td
+(2664 if\(n % PAGE\)) 11.438 Tj
+0 -23.5636 Td
+(2665 panic\("kalloc"\);) 15.05 Tj
+0 -24.8727 Td
+(2666 ) 3.01 Tj
+0 -26.1818 Td
+(2667 acquire\(&kalloc_lock\);) 17.458 Tj
+0 -27.4909 Td
+(2668 ) 3.01 Tj
+0 -28.8 Td
+(2669 rr = &freelist;) 13.244 Tj
+0 -30.1091 Td
+(2670 while\(*rr\){) 10.836 Tj
+0 -31.4182 Td
+(2671 struct run *r = *rr;) 17.458 Tj
+0 -32.7273 Td
+(2672 if\(r->len == n\){) 15.05 Tj
+0 -34.0364 Td
+(2673 *rr = r->next;) 15.05 Tj
+0 -35.3454 Td
+(2674 release\(&kalloc_lock\);) 19.866 Tj
+0 -36.6545 Td
+(2675 return \(char*\) r;) 16.856 Tj
+0 -37.9636 Td
+(2676 }) 6.02 Tj
+0 -39.2727 Td
+(2677 if\(r->len > n\){) 14.448 Tj
+0 -40.5818 Td
+(2678 char *p = \(char*\)r + \(r->len - n\);) 27.09 Tj
+0 -41.8909 Td
+(2679 r->len -= n;) 13.846 Tj
+0 -43.2 Td
+(2680 release\(&kalloc_lock\);) 19.866 Tj
+0 -44.5091 Td
+(2681 return p;) 12.04 Tj
+0 -45.8182 Td
+(2682 }) 6.02 Tj
+0 -47.1272 Td
+(2683 rr = &\(*rr\)->next;) 16.254 Tj
+0 -48.4363 Td
+(2684 }) 4.816 Tj
+0 -49.7454 Td
+(2685 release\(&kalloc_lock\);) 17.458 Tj
+0 -51.0545 Td
+(2686 cprintf\("kalloc: out of memory\\n"\);) 25.284 Tj
+0 -52.3636 Td
+(2687 return 0;) 9.632 Tj
+0 -53.6727 Td
+(2688 }) 3.612 Tj
+0 -54.9818 Td
+(2689 ) 3.01 Tj
+0 -56.2909 Td
+(2690 ) 3.01 Tj
+0 -57.6 Td
+(2691 ) 3.01 Tj
+0 -58.9091 Td
+(2692 ) 3.01 Tj
+0 -60.2181 Td
+(2693 ) 3.01 Tj
+0 -61.5272 Td
+(2694 ) 3.01 Tj
+0 -62.8363 Td
+(2695 ) 3.01 Tj
+0 -64.1454 Td
+(2696 ) 3.01 Tj
+0 -65.4545 Td
+(2697 ) 3.01 Tj
+0 -66.7636 Td
+(2698 ) 3.01 Tj
+0 -68.0727 Td
+(2699 ) 3.01 Tj
+0 -72 Td
+(Sheet 26) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 34 34
+%%BeginPageSetup
+%%PageOrientation: Landscape
+__tumble pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/syscall.h Page 1) 24.08 Tj
+0 -3.92728 Td
+(2700 // System call numbers) 16.254 Tj
+0 -5.23637 Td
+(2701 #define SYS_fork 1) 15.652 Tj
+0 -6.54546 Td
+(2702 #define SYS_exit 2) 15.652 Tj
+0 -7.85455 Td
+(2703 #define SYS_wait 3) 15.652 Tj
+0 -9.16364 Td
+(2704 #define SYS_pipe 4) 15.652 Tj
+0 -10.4727 Td
+(2705 #define SYS_write 5) 15.652 Tj
+0 -11.7818 Td
+(2706 #define SYS_read 6) 15.652 Tj
+0 -13.0909 Td
+(2707 #define SYS_close 7) 15.652 Tj
+0 -14.4 Td
+(2708 #define SYS_kill 8) 15.652 Tj
+0 -15.7091 Td
+(2709 #define SYS_exec 9) 15.652 Tj
+0 -17.0182 Td
+(2710 #define SYS_open 10) 15.652 Tj
+0 -18.3273 Td
+(2711 #define SYS_mknod 11) 15.652 Tj
+0 -19.6364 Td
+(2712 #define SYS_unlink 12) 15.652 Tj
+0 -20.9455 Td
+(2713 #define SYS_fstat 13) 15.652 Tj
+0 -22.2545 Td
+(2714 #define SYS_link 14) 15.652 Tj
+0 -23.5636 Td
+(2715 #define SYS_mkdir 15) 15.652 Tj
+0 -24.8727 Td
+(2716 #define SYS_chdir 16) 15.652 Tj
+0 -26.1818 Td
+(2717 #define SYS_dup 17) 15.652 Tj
+0 -27.4909 Td
+(2718 #define SYS_getpid 18) 15.652 Tj
+0 -28.8 Td
+(2719 #define SYS_sbrk 19) 15.652 Tj
+0 -30.1091 Td
+(2720 ) 3.01 Tj
+0 -31.4182 Td
+(2721 ) 3.01 Tj
+0 -32.7273 Td
+(2722 ) 3.01 Tj
+0 -34.0364 Td
+(2723 ) 3.01 Tj
+0 -35.3454 Td
+(2724 ) 3.01 Tj
+0 -36.6545 Td
+(2725 ) 3.01 Tj
+0 -37.9636 Td
+(2726 ) 3.01 Tj
+0 -39.2727 Td
+(2727 ) 3.01 Tj
+0 -40.5818 Td
+(2728 ) 3.01 Tj
+0 -41.8909 Td
+(2729 ) 3.01 Tj
+0 -43.2 Td
+(2730 ) 3.01 Tj
+0 -44.5091 Td
+(2731 ) 3.01 Tj
+0 -45.8182 Td
+(2732 ) 3.01 Tj
+0 -47.1272 Td
+(2733 ) 3.01 Tj
+0 -48.4363 Td
+(2734 ) 3.01 Tj
+0 -49.7454 Td
+(2735 ) 3.01 Tj
+0 -51.0545 Td
+(2736 ) 3.01 Tj
+0 -52.3636 Td
+(2737 ) 3.01 Tj
+0 -53.6727 Td
+(2738 ) 3.01 Tj
+0 -54.9818 Td
+(2739 ) 3.01 Tj
+0 -56.2909 Td
+(2740 ) 3.01 Tj
+0 -57.6 Td
+(2741 ) 3.01 Tj
+0 -58.9091 Td
+(2742 ) 3.01 Tj
+0 -60.2181 Td
+(2743 ) 3.01 Tj
+0 -61.5272 Td
+(2744 ) 3.01 Tj
+0 -62.8363 Td
+(2745 ) 3.01 Tj
+0 -64.1454 Td
+(2746 ) 3.01 Tj
+0 -65.4545 Td
+(2747 ) 3.01 Tj
+0 -66.7636 Td
+(2748 ) 3.01 Tj
+0 -68.0727 Td
+(2749 ) 3.01 Tj
+0 -72 Td
+(Sheet 27) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/trapasm.S Page 1) 24.08 Tj
+0 -3.92728 Td
+(2750 .text) 6.02 Tj
+0 -5.23637 Td
+(2751 .globl trap) 9.632 Tj
+0 -6.54546 Td
+(2752 .globl trapret1) 12.04 Tj
+0 -7.85455 Td
+(2753 ) 3.01 Tj
+0 -9.16364 Td
+(2754 .globl alltraps) 12.04 Tj
+0 -10.4727 Td
+(2755 alltraps:) 8.428 Tj
+0 -11.7818 Td
+(2756 /* vectors.S sends all traps here */) 25.886 Tj
+0 -13.0909 Td
+(2757 pushl %ds # build) 18.662 Tj
+0 -14.4 Td
+(2758 pushl %es # trap) 18.662 Tj
+0 -15.7091 Td
+(2759 pushal # frame) 19.264 Tj
+0 -17.0182 Td
+(2760 movl $16,%eax # SEG_KDATA << 3) 24.08 Tj
+0 -18.3273 Td
+(2761 movw %ax,%ds # kernel) 19.866 Tj
+0 -19.6364 Td
+(2762 movw %ax,%es # segments) 21.07 Tj
+0 -20.9455 Td
+(2763 pushl %esp # pass pointer to this trapframe) 33.712 Tj
+0 -22.2545 Td
+(2764 call trap # and call trap\(\)) 25.284 Tj
+0 -23.5636 Td
+(2765 addl $4, %esp) 12.04 Tj
+0 -24.8727 Td
+(2766 # return falls through to trapret...) 25.886 Tj
+0 -26.1818 Td
+(2767 ) 3.01 Tj
+0 -27.4909 Td
+(2768 /*) 5.418 Tj
+0 -28.8 Td
+(2769 * a forked process RETs here) 21.672 Tj
+0 -30.1091 Td
+(2770 * expects ESP to point to a Trapframe) 27.09 Tj
+0 -31.4182 Td
+(2771 */) 6.02 Tj
+0 -32.7273 Td
+(2772 .globl trapret) 11.438 Tj
+0 -34.0364 Td
+(2773 trapret:) 7.826 Tj
+0 -35.3454 Td
+(2774 popal) 7.224 Tj
+0 -36.6545 Td
+(2775 popl %es) 9.03 Tj
+0 -37.9636 Td
+(2776 popl %ds) 9.03 Tj
+0 -39.2727 Td
+(2777 addl $0x8, %esp /* trapno and errcode */) 28.294 Tj
+0 -40.5818 Td
+(2778 iret) 6.622 Tj
+0 -41.8909 Td
+(2779 ) 3.01 Tj
+0 -43.2 Td
+(2780 .globl forkret1) 12.04 Tj
+0 -44.5091 Td
+(2781 forkret1:) 8.428 Tj
+0 -45.8182 Td
+(2782 movl 4\(%esp\), %esp) 15.05 Tj
+0 -47.1272 Td
+(2783 jmp trapret) 10.836 Tj
+0 -48.4363 Td
+(2784 ) 3.01 Tj
+0 -49.7454 Td
+(2785 .globl acpu) 10.234 Tj
+0 -51.0545 Td
+(2786 acpu:) 6.02 Tj
+0 -52.3636 Td
+(2787 .long 0) 8.428 Tj
+0 -53.6727 Td
+(2788 ) 3.01 Tj
+0 -54.9818 Td
+(2789 ) 3.01 Tj
+0 -56.2909 Td
+(2790 ) 3.01 Tj
+0 -57.6 Td
+(2791 ) 3.01 Tj
+0 -58.9091 Td
+(2792 ) 3.01 Tj
+0 -60.2181 Td
+(2793 ) 3.01 Tj
+0 -61.5272 Td
+(2794 ) 3.01 Tj
+0 -62.8363 Td
+(2795 ) 3.01 Tj
+0 -64.1454 Td
+(2796 ) 3.01 Tj
+0 -65.4545 Td
+(2797 ) 3.01 Tj
+0 -66.7636 Td
+(2798 ) 3.01 Tj
+0 -68.0727 Td
+(2799 ) 3.01 Tj
+0 -72 Td
+(Sheet 27) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 35 35
+%%BeginPageSetup
+%%PageOrientation: Landscape
+pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/traps.h Page 1) 22.876 Tj
+0 -3.92728 Td
+(2800 // x86 trap and interrupt constants.) 24.682 Tj
+0 -5.23637 Td
+(2801 ) 3.01 Tj
+0 -6.54546 Td
+(2802 // Processor-defined:) 15.652 Tj
+0 -7.85455 Td
+(2803 #define T_DIVIDE 0 // divide error) 31.304 Tj
+0 -9.16364 Td
+(2804 #define T_DEBUG 1 // debug exception) 33.11 Tj
+0 -10.4727 Td
+(2805 #define T_NMI 2 // non-maskable interrupt) 37.324 Tj
+0 -11.7818 Td
+(2806 #define T_BRKPT 3 // breakpoint) 30.1 Tj
+0 -13.0909 Td
+(2807 #define T_OFLOW 4 // overflow) 28.896 Tj
+0 -14.4 Td
+(2808 #define T_BOUND 5 // bounds check) 31.304 Tj
+0 -15.7091 Td
+(2809 #define T_ILLOP 6 // illegal opcode) 32.508 Tj
+0 -17.0182 Td
+(2810 #define T_DEVICE 7 // device not available) 36.12 Tj
+0 -18.3273 Td
+(2811 #define T_DBLFLT 8 // double fault) 31.304 Tj
+0 -19.6364 Td
+(2812 // #define T_COPROC 9 // reserved \(not used since 486\)) 41.538 Tj
+0 -20.9455 Td
+(2813 #define T_TSS 10 // invalid task switch segment) 40.334 Tj
+0 -22.2545 Td
+(2814 #define T_SEGNP 11 // segment not present) 35.518 Tj
+0 -23.5636 Td
+(2815 #define T_STACK 12 // stack exception) 33.11 Tj
+0 -24.8727 Td
+(2816 #define T_GPFLT 13 // genernal protection fault) 39.13 Tj
+0 -26.1818 Td
+(2817 #define T_PGFLT 14 // page fault) 30.1 Tj
+0 -27.4909 Td
+(2818 // #define T_RES 15 // reserved) 28.896 Tj
+0 -28.8 Td
+(2819 #define T_FPERR 16 // floating point error) 36.12 Tj
+0 -30.1091 Td
+(2820 #define T_ALIGN 17 // aligment check) 32.508 Tj
+0 -31.4182 Td
+(2821 #define T_MCHK 18 // machine check) 31.906 Tj
+0 -32.7273 Td
+(2822 #define T_SIMDERR 19 // SIMD floating point error) 39.13 Tj
+0 -34.0364 Td
+(2823 ) 3.01 Tj
+0 -35.3454 Td
+(2824 // These are arbitrarily chosen, but with care not to overlap) 39.732 Tj
+0 -36.6545 Td
+(2825 // processor defined exceptions or interrupt vectors.) 34.916 Tj
+0 -37.9636 Td
+(2826 #define T_SYSCALL 48 // system call) 30.702 Tj
+0 -39.2727 Td
+(2827 #define T_DEFAULT 500 // catchall) 28.896 Tj
+0 -40.5818 Td
+(2828 ) 3.01 Tj
+0 -41.8909 Td
+(2829 #define IRQ_OFFSET 32 // IRQ 0 corresponds to int IRQ_OFFSET) 45.15 Tj
+0 -43.2 Td
+(2830 ) 3.01 Tj
+0 -44.5091 Td
+(2831 #define IRQ_TIMER 0) 18.662 Tj
+0 -45.8182 Td
+(2832 #define IRQ_KBD 1) 18.662 Tj
+0 -47.1272 Td
+(2833 #define IRQ_IDE 14) 18.662 Tj
+0 -48.4363 Td
+(2834 #define IRQ_ERROR 19) 18.662 Tj
+0 -49.7454 Td
+(2835 #define IRQ_SPURIOUS 31) 18.662 Tj
+0 -51.0545 Td
+(2836 ) 3.01 Tj
+0 -52.3636 Td
+(2837 ) 3.01 Tj
+0 -53.6727 Td
+(2838 ) 3.01 Tj
+0 -54.9818 Td
+(2839 ) 3.01 Tj
+0 -56.2909 Td
+(2840 ) 3.01 Tj
+0 -57.6 Td
+(2841 ) 3.01 Tj
+0 -58.9091 Td
+(2842 ) 3.01 Tj
+0 -60.2181 Td
+(2843 ) 3.01 Tj
+0 -61.5272 Td
+(2844 ) 3.01 Tj
+0 -62.8363 Td
+(2845 ) 3.01 Tj
+0 -64.1454 Td
+(2846 ) 3.01 Tj
+0 -65.4545 Td
+(2847 ) 3.01 Tj
+0 -66.7636 Td
+(2848 ) 3.01 Tj
+0 -68.0727 Td
+(2849 ) 3.01 Tj
+0 -72 Td
+(Sheet 28) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/trap.c Page 1) 22.274 Tj
+0 -3.92728 Td
+(2850 #include "types.h") 13.846 Tj
+0 -5.23637 Td
+(2851 #include "param.h") 13.846 Tj
+0 -6.54546 Td
+(2852 #include "mmu.h") 12.642 Tj
+0 -7.85455 Td
+(2853 #include "proc.h") 13.244 Tj
+0 -9.16364 Td
+(2854 #include "defs.h") 13.244 Tj
+0 -10.4727 Td
+(2855 #include "x86.h") 12.642 Tj
+0 -11.7818 Td
+(2856 #include "traps.h") 13.846 Tj
+0 -13.0909 Td
+(2857 #include "syscall.h") 15.05 Tj
+0 -14.4 Td
+(2858 ) 3.01 Tj
+0 -15.7091 Td
+(2859 // Interrupt descriptor table \(shared by all CPUs\).) 33.712 Tj
+0 -17.0182 Td
+(2860 struct gatedesc idt[256];) 18.06 Tj
+0 -18.3273 Td
+(2861 extern uint vectors[]; // in vectors.S: array of 256 entry pointers) 43.946 Tj
+0 -19.6364 Td
+(2862 ) 3.01 Tj
+0 -20.9455 Td
+(2863 void) 5.418 Tj
+0 -22.2545 Td
+(2864 tvinit\(void\)) 10.234 Tj
+0 -23.5636 Td
+(2865 {) 3.612 Tj
+0 -24.8727 Td
+(2866 int i;) 7.826 Tj
+0 -26.1818 Td
+(2867 ) 3.01 Tj
+0 -27.4909 Td
+(2868 for\(i = 0; i < 256; i++\)) 18.662 Tj
+0 -28.8 Td
+(2869 SETGATE\(idt[i], 0, SEG_KCODE << 3, vectors[i], 0\);) 35.518 Tj
+0 -30.1091 Td
+(2870 SETGATE\(idt[T_SYSCALL], 0, SEG_KCODE << 3, vectors[T_SYSCALL], 3\);) 43.946 Tj
+0 -31.4182 Td
+(2871 }) 3.612 Tj
+0 -32.7273 Td
+(2872 ) 3.01 Tj
+0 -34.0364 Td
+(2873 void) 5.418 Tj
+0 -35.3454 Td
+(2874 idtinit\(void\)) 10.836 Tj
+0 -36.6545 Td
+(2875 {) 3.612 Tj
+0 -37.9636 Td
+(2876 lidt\(idt, sizeof idt\);) 17.458 Tj
+0 -39.2727 Td
+(2877 }) 3.612 Tj
+0 -40.5818 Td
+(2878 ) 3.01 Tj
+0 -41.8909 Td
+(2879 void) 5.418 Tj
+0 -43.2 Td
+(2880 trap\(struct trapframe *tf\)) 18.662 Tj
+0 -44.5091 Td
+(2881 {) 3.612 Tj
+0 -45.8182 Td
+(2882 int v = tf->trapno;) 15.652 Tj
+0 -47.1272 Td
+(2883 struct proc *cp = curproc[cpu\(\)];) 24.08 Tj
+0 -48.4363 Td
+(2884 ) 3.01 Tj
+0 -49.7454 Td
+(2885 if\(v == T_SYSCALL\){) 15.652 Tj
+0 -51.0545 Td
+(2886 if\(cp->killed\)) 13.846 Tj
+0 -52.3636 Td
+(2887 proc_exit\(\);) 13.846 Tj
+0 -53.6727 Td
+(2888 cp->tf = tf;) 12.642 Tj
+0 -54.9818 Td
+(2889 syscall\(\);) 11.438 Tj
+0 -56.2909 Td
+(2890 if\(cp->killed\)) 13.846 Tj
+0 -57.6 Td
+(2891 proc_exit\(\);) 13.846 Tj
+0 -58.9091 Td
+(2892 return;) 9.632 Tj
+0 -60.2181 Td
+(2893 }) 4.816 Tj
+0 -61.5272 Td
+(2894 ) 3.01 Tj
+0 -62.8363 Td
+(2895 ) 3.01 Tj
+0 -64.1454 Td
+(2896 ) 3.01 Tj
+0 -65.4545 Td
+(2897 ) 3.01 Tj
+0 -66.7636 Td
+(2898 ) 3.01 Tj
+0 -68.0727 Td
+(2899 ) 3.01 Tj
+0 -72 Td
+(Sheet 28) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 36 36
+%%BeginPageSetup
+%%PageOrientation: Landscape
+__tumble pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/trap.c Page 2) 22.274 Tj
+0 -3.92728 Td
+(2900 // Increment nlock to make sure interrupts stay off) 34.916 Tj
+0 -5.23637 Td
+(2901 // during interrupt handler. Decrement before returning.) 38.528 Tj
+0 -6.54546 Td
+(2902 cpus[cpu\(\)].nlock++;) 16.254 Tj
+0 -7.85455 Td
+(2903 ) 3.01 Tj
+0 -9.16364 Td
+(2904 switch\(v\){) 10.234 Tj
+0 -10.4727 Td
+(2905 case IRQ_OFFSET + IRQ_TIMER:) 21.07 Tj
+0 -11.7818 Td
+(2906 lapic_timerintr\(\);) 16.254 Tj
+0 -13.0909 Td
+(2907 cpus[cpu\(\)].nlock--;) 17.458 Tj
+0 -14.4 Td
+(2908 if\(cp\){) 9.632 Tj
+0 -15.7091 Td
+(2909 // Force process exit if it has been killed and is in user space.) 45.752 Tj
+0 -17.0182 Td
+(2910 // \(If it is still executing in the kernel, let it keep running) 44.548 Tj
+0 -18.3273 Td
+(2911 // until it gets to the regular system call return.\)) 37.926 Tj
+0 -19.6364 Td
+(2912 if\(\(tf->cs&3\) == 3 && cp->killed\)) 26.488 Tj
+0 -20.9455 Td
+(2913 proc_exit\(\);) 15.05 Tj
+0 -22.2545 Td
+(2914 ) 3.01 Tj
+0 -23.5636 Td
+(2915 // Force process to give up CPU and let others run.) 37.324 Tj
+0 -24.8727 Td
+(2916 if\(cp->state == RUNNING\)) 21.07 Tj
+0 -26.1818 Td
+(2917 yield\(\);) 12.642 Tj
+0 -27.4909 Td
+(2918 }) 6.02 Tj
+0 -28.8 Td
+(2919 return;) 9.632 Tj
+0 -30.1091 Td
+(2920 ) 3.01 Tj
+0 -31.4182 Td
+(2921 case IRQ_OFFSET + IRQ_IDE:) 19.866 Tj
+0 -32.7273 Td
+(2922 ide_intr\(\);) 12.04 Tj
+0 -34.0364 Td
+(2923 lapic_eoi\(\);) 12.642 Tj
+0 -35.3454 Td
+(2924 break;) 9.03 Tj
+0 -36.6545 Td
+(2925 ) 3.01 Tj
+0 -37.9636 Td
+(2926 case IRQ_OFFSET + IRQ_KBD:) 19.866 Tj
+0 -39.2727 Td
+(2927 kbd_intr\(\);) 12.04 Tj
+0 -40.5818 Td
+(2928 lapic_eoi\(\);) 12.642 Tj
+0 -41.8909 Td
+(2929 break;) 9.03 Tj
+0 -43.2 Td
+(2930 ) 3.01 Tj
+0 -44.5091 Td
+(2931 case IRQ_OFFSET + IRQ_SPURIOUS:) 22.876 Tj
+0 -45.8182 Td
+(2932 cprintf\("spurious interrupt from cpu %d eip %x\\n", cpu\(\), tf->eip\);) 45.752 Tj
+0 -47.1272 Td
+(2933 break;) 9.03 Tj
+0 -48.4363 Td
+(2934 ) 3.01 Tj
+0 -49.7454 Td
+(2935 default:) 9.03 Tj
+0 -51.0545 Td
+(2936 if\(curproc[cpu\(\)]\) {) 17.458 Tj
+0 -52.3636 Td
+(2937 // Assume process divided by zero or dereferenced null, etc.) 42.742 Tj
+0 -53.6727 Td
+(2938 cprintf\("pid %d: unhandled trap %d on cpu %d eip %x -- kill proc\\n",) 47.558 Tj
+0 -54.9818 Td
+(2939 curproc[cpu\(\)]->pid, v, cpu\(\), tf->eip\);) 35.518 Tj
+0 -56.2909 Td
+(2940 proc_exit\(\);) 13.846 Tj
+0 -57.6 Td
+(2941 }) 6.02 Tj
+0 -58.9091 Td
+(2942 ) 3.01 Tj
+0 -60.2181 Td
+(2943 // Otherwise it's our mistake.) 23.478 Tj
+0 -61.5272 Td
+(2944 cprintf\("unexpected trap %d from cpu %d eip %x\\n", v, cpu\(\), tf->eip\);) 47.558 Tj
+0 -62.8363 Td
+(2945 panic\("trap"\);) 13.846 Tj
+0 -64.1454 Td
+(2946 }) 4.816 Tj
+0 -65.4545 Td
+(2947 ) 3.01 Tj
+0 -66.7636 Td
+(2948 cpus[cpu\(\)].nlock--;) 16.254 Tj
+0 -68.0727 Td
+(2949 }) 3.612 Tj
+0 -72 Td
+(Sheet 29) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/vectors.pl Page 1) 24.682 Tj
+0 -3.92728 Td
+(2950 #!/usr/bin/perl -w) 13.846 Tj
+0 -5.23637 Td
+(2951 ) 3.01 Tj
+0 -6.54546 Td
+(2952 # Generate vectors.S, the trap/interrupt entry points.) 35.518 Tj
+0 -7.85455 Td
+(2953 # There has to be one entry point per interrupt number) 35.518 Tj
+0 -9.16364 Td
+(2954 # since otherwise there's no way for trap\(\) to discover) 36.12 Tj
+0 -10.4727 Td
+(2955 # the interrupt number.) 16.856 Tj
+0 -11.7818 Td
+(2956 ) 3.01 Tj
+0 -13.0909 Td
+(2957 print "# generated by vectors.pl - do not edit\\n";) 33.11 Tj
+0 -14.4 Td
+(2958 print "# handlers\\n";) 15.652 Tj
+0 -15.7091 Td
+(2959 print ".text\\n";) 12.642 Tj
+0 -17.0182 Td
+(2960 print ".globl alltraps\\n";) 18.662 Tj
+0 -18.3273 Td
+(2961 for\(my $i = 0; $i < 256; $i++\){) 21.672 Tj
+0 -19.6364 Td
+(2962 print ".globl vector$i\\n";) 21.07 Tj
+0 -20.9455 Td
+(2963 print "vector$i:\\n";) 17.458 Tj
+0 -22.2545 Td
+(2964 if\(\($i < 8 || $i > 14\) && $i != 17\){) 27.09 Tj
+0 -23.5636 Td
+(2965 print " pushl \\$0\\n";) 21.07 Tj
+0 -24.8727 Td
+(2966 }) 6.02 Tj
+0 -26.1818 Td
+(2967 print " pushl \\$$i\\n";) 19.264 Tj
+0 -27.4909 Td
+(2968 print " jmp alltraps\\n";) 20.468 Tj
+0 -28.8 Td
+(2969 }) 3.612 Tj
+0 -30.1091 Td
+(2970 ) 3.01 Tj
+0 -31.4182 Td
+(2971 print "\\n# vector table\\n";) 19.264 Tj
+0 -32.7273 Td
+(2972 print ".data\\n";) 12.642 Tj
+0 -34.0364 Td
+(2973 print ".globl vectors\\n";) 18.06 Tj
+0 -35.3454 Td
+(2974 print "vectors:\\n";) 14.448 Tj
+0 -36.6545 Td
+(2975 for\(my $i = 0; $i < 256; $i++\){) 21.672 Tj
+0 -37.9636 Td
+(2976 print " .long vector$i\\n";) 21.672 Tj
+0 -39.2727 Td
+(2977 }) 3.612 Tj
+0 -40.5818 Td
+(2978 ) 3.01 Tj
+0 -41.8909 Td
+(2979 ) 3.01 Tj
+0 -43.2 Td
+(2980 ) 3.01 Tj
+0 -44.5091 Td
+(2981 ) 3.01 Tj
+0 -45.8182 Td
+(2982 ) 3.01 Tj
+0 -47.1272 Td
+(2983 ) 3.01 Tj
+0 -48.4363 Td
+(2984 ) 3.01 Tj
+0 -49.7454 Td
+(2985 ) 3.01 Tj
+0 -51.0545 Td
+(2986 ) 3.01 Tj
+0 -52.3636 Td
+(2987 ) 3.01 Tj
+0 -53.6727 Td
+(2988 ) 3.01 Tj
+0 -54.9818 Td
+(2989 ) 3.01 Tj
+0 -56.2909 Td
+(2990 ) 3.01 Tj
+0 -57.6 Td
+(2991 ) 3.01 Tj
+0 -58.9091 Td
+(2992 ) 3.01 Tj
+0 -60.2181 Td
+(2993 ) 3.01 Tj
+0 -61.5272 Td
+(2994 ) 3.01 Tj
+0 -62.8363 Td
+(2995 ) 3.01 Tj
+0 -64.1454 Td
+(2996 ) 3.01 Tj
+0 -65.4545 Td
+(2997 ) 3.01 Tj
+0 -66.7636 Td
+(2998 ) 3.01 Tj
+0 -68.0727 Td
+(2999 ) 3.01 Tj
+0 -72 Td
+(Sheet 29) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 37 37
+%%BeginPageSetup
+%%PageOrientation: Landscape
+pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/syscall.c Page 1) 24.08 Tj
+0 -3.92728 Td
+(3000 #include "types.h") 13.846 Tj
+0 -5.23637 Td
+(3001 #include "stat.h") 13.244 Tj
+0 -6.54546 Td
+(3002 #include "param.h") 13.846 Tj
+0 -7.85455 Td
+(3003 #include "mmu.h") 12.642 Tj
+0 -9.16364 Td
+(3004 #include "proc.h") 13.244 Tj
+0 -10.4727 Td
+(3005 #include "defs.h") 13.244 Tj
+0 -11.7818 Td
+(3006 #include "x86.h") 12.642 Tj
+0 -13.0909 Td
+(3007 #include "traps.h") 13.846 Tj
+0 -14.4 Td
+(3008 #include "syscall.h") 15.05 Tj
+0 -15.7091 Td
+(3009 #include "spinlock.h") 15.652 Tj
+0 -17.0182 Td
+(3010 #include "buf.h") 12.642 Tj
+0 -18.3273 Td
+(3011 #include "fs.h") 12.04 Tj
+0 -19.6364 Td
+(3012 #include "fsvar.h") 13.846 Tj
+0 -20.9455 Td
+(3013 #include "elf.h") 12.642 Tj
+0 -22.2545 Td
+(3014 #include "file.h") 13.244 Tj
+0 -23.5636 Td
+(3015 #include "fcntl.h") 13.846 Tj
+0 -24.8727 Td
+(3016 ) 3.01 Tj
+0 -26.1818 Td
+(3017 // User code makes a system call with INT T_SYSCALL.) 34.314 Tj
+0 -27.4909 Td
+(3018 // System call number in %eax.) 21.07 Tj
+0 -28.8 Td
+(3019 // Arguments on the stack, from the user call to the C) 35.518 Tj
+0 -30.1091 Td
+(3020 // library system call function. The saved user %esp points) 38.528 Tj
+0 -31.4182 Td
+(3021 // to a saved program counter, and then the first argument.) 38.528 Tj
+0 -32.7273 Td
+(3022 ) 3.01 Tj
+0 -34.0364 Td
+(3023 // Fetch the int at addr from process p.) 27.09 Tj
+0 -35.3454 Td
+(3024 int) 4.816 Tj
+0 -36.6545 Td
+(3025 fetchint\(struct proc *p, uint addr, int *ip\)) 29.498 Tj
+0 -37.9636 Td
+(3026 {) 3.612 Tj
+0 -39.2727 Td
+(3027 if\(addr >= p->sz || addr+4 > p->sz\)) 25.284 Tj
+0 -40.5818 Td
+(3028 return -1;) 11.438 Tj
+0 -41.8909 Td
+(3029 *ip = *\(int*\)\(p->mem + addr\);) 21.672 Tj
+0 -43.2 Td
+(3030 return 0;) 9.632 Tj
+0 -44.5091 Td
+(3031 }) 3.612 Tj
+0 -45.8182 Td
+(3032 ) 3.01 Tj
+0 -47.1272 Td
+(3033 // Fetch the nul-terminated string at addr from process p.) 37.926 Tj
+0 -48.4363 Td
+(3034 // Doesn't actually copy the string - just sets *pp to point at it.) 43.344 Tj
+0 -49.7454 Td
+(3035 // Returns length of string, not including nul.) 31.304 Tj
+0 -51.0545 Td
+(3036 int) 4.816 Tj
+0 -52.3636 Td
+(3037 fetchstr\(struct proc *p, uint addr, char **pp\)) 30.702 Tj
+0 -53.6727 Td
+(3038 {) 3.612 Tj
+0 -54.9818 Td
+(3039 char *cp, *ep;) 12.642 Tj
+0 -56.2909 Td
+(3040 ) 3.01 Tj
+0 -57.6 Td
+(3041 if\(addr >= p->sz\)) 14.448 Tj
+0 -58.9091 Td
+(3042 return -1;) 11.438 Tj
+0 -60.2181 Td
+(3043 *pp = p->mem + addr;) 16.254 Tj
+0 -61.5272 Td
+(3044 ep = p->mem + p->sz;) 16.254 Tj
+0 -62.8363 Td
+(3045 for\(cp = *pp; cp < ep; cp++\)) 21.07 Tj
+0 -64.1454 Td
+(3046 if\(*cp == 0\)) 12.642 Tj
+0 -65.4545 Td
+(3047 return cp - *pp;) 16.254 Tj
+0 -66.7636 Td
+(3048 return -1;) 10.234 Tj
+0 -68.0727 Td
+(3049 }) 3.612 Tj
+0 -72 Td
+(Sheet 30) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/syscall.c Page 2) 24.08 Tj
+0 -3.92728 Td
+(3050 // Fetch the argno'th word-sized system call argument as an integer.) 43.946 Tj
+0 -5.23637 Td
+(3051 int) 4.816 Tj
+0 -6.54546 Td
+(3052 argint\(int argno, int *ip\)) 18.662 Tj
+0 -7.85455 Td
+(3053 {) 3.612 Tj
+0 -9.16364 Td
+(3054 struct proc *p = curproc[cpu\(\)];) 23.478 Tj
+0 -10.4727 Td
+(3055 ) 3.01 Tj
+0 -11.7818 Td
+(3056 return fetchint\(p, p->tf->esp + 4 + 4*argno, ip\);) 33.712 Tj
+0 -13.0909 Td
+(3057 }) 3.612 Tj
+0 -14.4 Td
+(3058 ) 3.01 Tj
+0 -15.7091 Td
+(3059 // Fetch the nth word-sized system call argument as a pointer) 39.732 Tj
+0 -17.0182 Td
+(3060 // to a block of memory of size n bytes. Check that the pointer) 41.538 Tj
+0 -18.3273 Td
+(3061 // lies within the process address space.) 27.692 Tj
+0 -19.6364 Td
+(3062 int) 4.816 Tj
+0 -20.9455 Td
+(3063 argptr\(int argno, char **pp, int size\)) 25.886 Tj
+0 -22.2545 Td
+(3064 {) 3.612 Tj
+0 -23.5636 Td
+(3065 int i;) 7.826 Tj
+0 -24.8727 Td
+(3066 struct proc *p = curproc[cpu\(\)];) 23.478 Tj
+0 -26.1818 Td
+(3067 ) 3.01 Tj
+0 -27.4909 Td
+(3068 if\(argint\(argno, &i\) < 0\)) 19.264 Tj
+0 -28.8 Td
+(3069 return -1;) 11.438 Tj
+0 -30.1091 Td
+(3070 if\(\(uint\)i >= p->sz || \(uint\)i+size >= p->sz\)) 31.304 Tj
+0 -31.4182 Td
+(3071 return -1;) 11.438 Tj
+0 -32.7273 Td
+(3072 *pp = p->mem + i;) 14.448 Tj
+0 -34.0364 Td
+(3073 return 0;) 9.632 Tj
+0 -35.3454 Td
+(3074 }) 3.612 Tj
+0 -36.6545 Td
+(3075 ) 3.01 Tj
+0 -37.9636 Td
+(3076 // Fetch the nth word-sized system call argument as a string pointer.) 44.548 Tj
+0 -39.2727 Td
+(3077 // Check that the pointer is valid and the string is nul-terminated.) 43.946 Tj
+0 -40.5818 Td
+(3078 // \(There is no shared writable memory, so the string can't change) 42.742 Tj
+0 -41.8909 Td
+(3079 // between this check and being used by the kernel.\)) 34.314 Tj
+0 -43.2 Td
+(3080 int) 4.816 Tj
+0 -44.5091 Td
+(3081 argstr\(int argno, char **pp\)) 19.866 Tj
+0 -45.8182 Td
+(3082 {) 3.612 Tj
+0 -47.1272 Td
+(3083 int addr;) 9.632 Tj
+0 -48.4363 Td
+(3084 if\(argint\(argno, &addr\) < 0\)) 21.07 Tj
+0 -49.7454 Td
+(3085 return -1;) 11.438 Tj
+0 -51.0545 Td
+(3086 return fetchstr\(curproc[cpu\(\)], addr, pp\);) 29.498 Tj
+0 -52.3636 Td
+(3087 }) 3.612 Tj
+0 -53.6727 Td
+(3088 ) 3.01 Tj
+0 -54.9818 Td
+(3089 ) 3.01 Tj
+0 -56.2909 Td
+(3090 ) 3.01 Tj
+0 -57.6 Td
+(3091 ) 3.01 Tj
+0 -58.9091 Td
+(3092 ) 3.01 Tj
+0 -60.2181 Td
+(3093 ) 3.01 Tj
+0 -61.5272 Td
+(3094 ) 3.01 Tj
+0 -62.8363 Td
+(3095 ) 3.01 Tj
+0 -64.1454 Td
+(3096 ) 3.01 Tj
+0 -65.4545 Td
+(3097 ) 3.01 Tj
+0 -66.7636 Td
+(3098 ) 3.01 Tj
+0 -68.0727 Td
+(3099 ) 3.01 Tj
+0 -72 Td
+(Sheet 30) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 38 38
+%%BeginPageSetup
+%%PageOrientation: Landscape
+__tumble pdfStartPage
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+(3100 extern int sys_chdir\(void\);) 19.264 Tj
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+(3101 extern int sys_close\(void\);) 19.264 Tj
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+(3102 extern int sys_dup\(void\);) 18.06 Tj
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+(3103 extern int sys_exec\(void\);) 18.662 Tj
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+(3104 extern int sys_exit\(void\);) 18.662 Tj
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+(3105 extern int sys_fork\(void\);) 18.662 Tj
+0 -11.7818 Td
+(3106 extern int sys_fstat\(void\);) 19.264 Tj
+0 -13.0909 Td
+(3107 extern int sys_getpid\(void\);) 19.866 Tj
+0 -14.4 Td
+(3108 extern int sys_kill\(void\);) 18.662 Tj
+0 -15.7091 Td
+(3109 extern int sys_link\(void\);) 18.662 Tj
+0 -17.0182 Td
+(3110 extern int sys_mkdir\(void\);) 19.264 Tj
+0 -18.3273 Td
+(3111 extern int sys_mknod\(void\);) 19.264 Tj
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+(3112 extern int sys_open\(void\);) 18.662 Tj
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+(3113 extern int sys_pipe\(void\);) 18.662 Tj
+0 -22.2545 Td
+(3114 extern int sys_read\(void\);) 18.662 Tj
+0 -23.5636 Td
+(3115 extern int sys_sbrk\(void\);) 18.662 Tj
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+(3116 extern int sys_unlink\(void\);) 19.866 Tj
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+(3117 extern int sys_wait\(void\);) 18.662 Tj
+0 -27.4909 Td
+(3118 extern int sys_write\(void\);) 19.264 Tj
+0 -28.8 Td
+(3119 ) 3.01 Tj
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+(3120 void) 5.418 Tj
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+(3121 syscall\(void\)) 10.836 Tj
+0 -32.7273 Td
+(3122 {) 3.612 Tj
+0 -34.0364 Td
+(3123 struct proc *cp = curproc[cpu\(\)];) 24.08 Tj
+0 -35.3454 Td
+(3124 int num = cp->tf->eax;) 17.458 Tj
+0 -36.6545 Td
+(3125 int ret = -1;) 12.04 Tj
+0 -37.9636 Td
+(3126 ) 3.01 Tj
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+(3127 switch\(num\){) 11.438 Tj
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+(3128 case SYS_fork:) 12.642 Tj
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+(3129 ret = sys_fork\(\);) 15.652 Tj
+0 -43.2 Td
+(3130 break;) 9.03 Tj
+0 -44.5091 Td
+(3131 case SYS_exit:) 12.642 Tj
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+(3132 ret = sys_exit\(\);) 15.652 Tj
+0 -47.1272 Td
+(3133 break;) 9.03 Tj
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+(3134 case SYS_wait:) 12.642 Tj
+0 -49.7454 Td
+(3135 ret = sys_wait\(\);) 15.652 Tj
+0 -51.0545 Td
+(3136 break;) 9.03 Tj
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+(3137 case SYS_pipe:) 12.642 Tj
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+(3138 ret = sys_pipe\(\);) 15.652 Tj
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+(3139 break;) 9.03 Tj
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+(3140 case SYS_write:) 13.244 Tj
+0 -57.6 Td
+(3141 ret = sys_write\(\);) 16.254 Tj
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+(3142 break;) 9.03 Tj
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+(3143 case SYS_read:) 12.642 Tj
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+(3144 ret = sys_read\(\);) 15.652 Tj
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+(3145 break;) 9.03 Tj
+0 -64.1454 Td
+(3146 case SYS_close:) 13.244 Tj
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+(3147 ret = sys_close\(\);) 16.254 Tj
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+(3148 break;) 9.03 Tj
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+(3149 case SYS_kill:) 12.642 Tj
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+W
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+(3152 case SYS_exec:) 12.642 Tj
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+(3153 ret = sys_exec\(\);) 15.652 Tj
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+(3155 case SYS_open:) 12.642 Tj
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+(3156 ret = sys_open\(\);) 15.652 Tj
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+(3159 ret = sys_mknod\(\);) 16.254 Tj
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+(3160 break;) 9.03 Tj
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+(3161 case SYS_unlink:) 13.846 Tj
+0 -19.6364 Td
+(3162 ret = sys_unlink\(\);) 16.856 Tj
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+(3163 break;) 9.03 Tj
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+(3164 case SYS_fstat:) 13.244 Tj
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+(3165 ret = sys_fstat\(\);) 16.254 Tj
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+(3166 break;) 9.03 Tj
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+(3167 case SYS_link:) 12.642 Tj
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+(3168 ret = sys_link\(\);) 15.652 Tj
+0 -28.8 Td
+(3169 break;) 9.03 Tj
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+(3170 case SYS_mkdir:) 13.244 Tj
+0 -31.4182 Td
+(3171 ret = sys_mkdir\(\);) 16.254 Tj
+0 -32.7273 Td
+(3172 break;) 9.03 Tj
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+(3173 case SYS_chdir:) 13.244 Tj
+0 -35.3454 Td
+(3174 ret = sys_chdir\(\);) 16.254 Tj
+0 -36.6545 Td
+(3175 break;) 9.03 Tj
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+(3176 case SYS_dup:) 12.04 Tj
+0 -39.2727 Td
+(3177 ret = sys_dup\(\);) 15.05 Tj
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+(3179 case SYS_getpid:) 13.846 Tj
+0 -43.2 Td
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+0 -47.1272 Td
+(3183 ret = sys_sbrk\(\);) 15.652 Tj
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+(3184 break;) 9.03 Tj
+0 -49.7454 Td
+(3185 default:) 9.03 Tj
+0 -51.0545 Td
+(3186 cprintf\("unknown sys call %d\\n", num\);) 28.294 Tj
+0 -52.3636 Td
+(3187 // Maybe kill the process?) 21.07 Tj
+0 -53.6727 Td
+(3188 break;) 9.03 Tj
+0 -54.9818 Td
+(3189 }) 4.816 Tj
+0 -56.2909 Td
+(3190 cp->tf->eax = ret;) 15.05 Tj
+0 -57.6 Td
+(3191 }) 3.612 Tj
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+(3192 ) 3.01 Tj
+0 -60.2181 Td
+(3193 ) 3.01 Tj
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+(3194 ) 3.01 Tj
+0 -62.8363 Td
+(3195 ) 3.01 Tj
+0 -64.1454 Td
+(3196 ) 3.01 Tj
+0 -65.4545 Td
+(3197 ) 3.01 Tj
+0 -66.7636 Td
+(3198 ) 3.01 Tj
+0 -68.0727 Td
+(3199 ) 3.01 Tj
+0 -72 Td
+(Sheet 31) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
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+W
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+(3201 #include "stat.h") 13.244 Tj
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+0 -13.0909 Td
+(3207 #include "traps.h") 13.846 Tj
+0 -14.4 Td
+(3208 #include "syscall.h") 15.05 Tj
+0 -15.7091 Td
+(3209 #include "spinlock.h") 15.652 Tj
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+(3210 #include "buf.h") 12.642 Tj
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+(3211 #include "fs.h") 12.04 Tj
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+(3213 #include "elf.h") 12.642 Tj
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+(3214 #include "file.h") 13.244 Tj
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+(3221 ) 3.01 Tj
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+(3227 ) 3.01 Tj
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+0 -68.0727 Td
+(3249 }) 3.612 Tj
+0 -72 Td
+(Sheet 32) 4.816 Tj
+Q
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+180 500 5760 3460 re
+W
+q
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+[1 0 0 1 0 0] Tm
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+0 -9.16364 Td
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+(3262 ) 3.01 Tj
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+(3270 ) 3.01 Tj
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+(3271 ) 3.01 Tj
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+(3275 ) 3.01 Tj
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+(3278 ) 3.01 Tj
+0 -41.8909 Td
+(3279 ) 3.01 Tj
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+(3283 ) 3.01 Tj
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+(3284 ) 3.01 Tj
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+(3286 ) 3.01 Tj
+0 -52.3636 Td
+(3287 ) 3.01 Tj
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+(3288 ) 3.01 Tj
+0 -54.9818 Td
+(3289 ) 3.01 Tj
+0 -56.2909 Td
+(3290 ) 3.01 Tj
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+(3291 ) 3.01 Tj
+0 -58.9091 Td
+(3292 ) 3.01 Tj
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+(3293 ) 3.01 Tj
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+(3294 ) 3.01 Tj
+0 -62.8363 Td
+(3295 ) 3.01 Tj
+0 -64.1454 Td
+(3296 ) 3.01 Tj
+0 -65.4545 Td
+(3297 ) 3.01 Tj
+0 -66.7636 Td
+(3298 ) 3.01 Tj
+0 -68.0727 Td
+(3299 ) 3.01 Tj
+0 -72 Td
+(Sheet 32) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 40 40
+%%BeginPageSetup
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+W
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+(3301 int flags;) 10.234 Tj
+0 -6.54546 Td
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+0 -7.85455 Td
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+0 -9.16364 Td
+(3304 struct buf *prev;) 14.448 Tj
+0 -10.4727 Td
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+0 -11.7818 Td
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+(3307 };) 4.214 Tj
+0 -14.4 Td
+(3308 #define B_BUSY 0x1 // buffer is locked by some process) 36.12 Tj
+0 -15.7091 Td
+(3309 #define B_VALID 0x2 // buffer contains the data of the sector) 39.732 Tj
+0 -17.0182 Td
+(3310 ) 3.01 Tj
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+(3311 ) 3.01 Tj
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+(3318 ) 3.01 Tj
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+(3319 ) 3.01 Tj
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+(3322 ) 3.01 Tj
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+0 -43.2 Td
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+(3332 ) 3.01 Tj
+0 -47.1272 Td
+(3333 ) 3.01 Tj
+0 -48.4363 Td
+(3334 ) 3.01 Tj
+0 -49.7454 Td
+(3335 ) 3.01 Tj
+0 -51.0545 Td
+(3336 ) 3.01 Tj
+0 -52.3636 Td
+(3337 ) 3.01 Tj
+0 -53.6727 Td
+(3338 ) 3.01 Tj
+0 -54.9818 Td
+(3339 ) 3.01 Tj
+0 -56.2909 Td
+(3340 ) 3.01 Tj
+0 -57.6 Td
+(3341 ) 3.01 Tj
+0 -58.9091 Td
+(3342 ) 3.01 Tj
+0 -60.2181 Td
+(3343 ) 3.01 Tj
+0 -61.5272 Td
+(3344 ) 3.01 Tj
+0 -62.8363 Td
+(3345 ) 3.01 Tj
+0 -64.1454 Td
+(3346 ) 3.01 Tj
+0 -65.4545 Td
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+(3348 ) 3.01 Tj
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+(3349 ) 3.01 Tj
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+180 500 5760 3460 re
+W
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+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
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+0 0 Td
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+(Sep 8 11:37 2006 xv6/dev.h Page 1) 21.672 Tj
+0 -3.92728 Td
+(3350 struct devsw {) 11.438 Tj
+0 -5.23637 Td
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+(3646 ) 3.01 Tj
+0 -65.4545 Td
+(3647 ) 3.01 Tj
+0 -66.7636 Td
+(3648 ) 3.01 Tj
+0 -68.0727 Td
+(3649 ) 3.01 Tj
+0 -72 Td
+(Sheet 36) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/fsvar.h Page 1) 22.876 Tj
+0 -3.92728 Td
+(3650 // in-core file system types) 19.866 Tj
+0 -5.23637 Td
+(3651 ) 3.01 Tj
+0 -6.54546 Td
+(3652 struct inode {) 11.438 Tj
+0 -7.85455 Td
+(3653 uint dev; // Device number) 25.886 Tj
+0 -9.16364 Td
+(3654 uint inum; // Inode number) 25.284 Tj
+0 -10.4727 Td
+(3655 int ref; // Reference count) 27.09 Tj
+0 -11.7818 Td
+(3656 int busy; // Is the inode "locked"?) 31.304 Tj
+0 -13.0909 Td
+(3657 ) 3.01 Tj
+0 -14.4 Td
+(3658 short type; // copy of disk inode) 28.896 Tj
+0 -15.7091 Td
+(3659 short major;) 11.438 Tj
+0 -17.0182 Td
+(3660 short minor;) 11.438 Tj
+0 -18.3273 Td
+(3661 short nlink;) 11.438 Tj
+0 -19.6364 Td
+(3662 uint size;) 10.234 Tj
+0 -20.9455 Td
+(3663 uint addrs[NADDRS];) 15.652 Tj
+0 -22.2545 Td
+(3664 };) 4.214 Tj
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+(3666 extern uint rootdev;) 15.05 Tj
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+(3668 #define NAMEI_LOOKUP 1) 16.254 Tj
+0 -28.8 Td
+(3669 #define NAMEI_CREATE 2) 16.254 Tj
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+(3670 #define NAMEI_DELETE 3) 16.254 Tj
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+0 -61.5272 Td
+(3694 ) 3.01 Tj
+0 -62.8363 Td
+(3695 ) 3.01 Tj
+0 -64.1454 Td
+(3696 ) 3.01 Tj
+0 -65.4545 Td
+(3697 ) 3.01 Tj
+0 -66.7636 Td
+(3698 ) 3.01 Tj
+0 -68.0727 Td
+(3699 ) 3.01 Tj
+0 -72 Td
+(Sheet 36) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 44 44
+%%BeginPageSetup
+%%PageOrientation: Landscape
+__tumble pdfStartPage
+%%EndPageSetup
+[] 0 d
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+q
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+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
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+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/ide.c Page 1) 21.672 Tj
+0 -3.92728 Td
+(3700 // Simple PIO-based \(non-DMA\) IDE driver code.) 30.702 Tj
+0 -5.23637 Td
+(3701 ) 3.01 Tj
+0 -6.54546 Td
+(3702 #include "types.h") 13.846 Tj
+0 -7.85455 Td
+(3703 #include "param.h") 13.846 Tj
+0 -9.16364 Td
+(3704 #include "mmu.h") 12.642 Tj
+0 -10.4727 Td
+(3705 #include "proc.h") 13.244 Tj
+0 -11.7818 Td
+(3706 #include "defs.h") 13.244 Tj
+0 -13.0909 Td
+(3707 #include "x86.h") 12.642 Tj
+0 -14.4 Td
+(3708 #include "traps.h") 13.846 Tj
+0 -15.7091 Td
+(3709 #include "spinlock.h") 15.652 Tj
+0 -17.0182 Td
+(3710 ) 3.01 Tj
+0 -18.3273 Td
+(3711 #define IDE_BSY 0x80) 18.662 Tj
+0 -19.6364 Td
+(3712 #define IDE_DRDY 0x40) 18.662 Tj
+0 -20.9455 Td
+(3713 #define IDE_DF 0x20) 18.662 Tj
+0 -22.2545 Td
+(3714 #define IDE_ERR 0x01) 18.662 Tj
+0 -23.5636 Td
+(3715 ) 3.01 Tj
+0 -24.8727 Td
+(3716 #define IDE_CMD_READ 0x20) 18.662 Tj
+0 -26.1818 Td
+(3717 #define IDE_CMD_WRITE 0x30) 18.662 Tj
+0 -27.4909 Td
+(3718 ) 3.01 Tj
+0 -28.8 Td
+(3719 // IDE request queue.) 15.652 Tj
+0 -30.1091 Td
+(3720 // The next request will be stored in request[head],) 34.314 Tj
+0 -31.4182 Td
+(3721 // and the request currently being served by the disk) 34.916 Tj
+0 -32.7273 Td
+(3722 // is request[tail].) 15.05 Tj
+0 -34.0364 Td
+(3723 // Must hold ide_lock while manipulating queue.) 31.304 Tj
+0 -35.3454 Td
+(3724 ) 3.01 Tj
+0 -36.6545 Td
+(3725 struct ide_request {) 15.05 Tj
+0 -37.9636 Td
+(3726 int diskno;) 10.836 Tj
+0 -39.2727 Td
+(3727 uint secno;) 10.836 Tj
+0 -40.5818 Td
+(3728 void *addr;) 10.836 Tj
+0 -41.8909 Td
+(3729 uint nsecs;) 10.836 Tj
+0 -43.2 Td
+(3730 uint read;) 10.234 Tj
+0 -44.5091 Td
+(3731 };) 4.214 Tj
+0 -45.8182 Td
+(3732 ) 3.01 Tj
+0 -47.1272 Td
+(3733 static struct ide_request request[NREQUEST];) 29.498 Tj
+0 -48.4363 Td
+(3734 static int head, tail;) 16.254 Tj
+0 -49.7454 Td
+(3735 static struct spinlock ide_lock;) 22.274 Tj
+0 -51.0545 Td
+(3736 ) 3.01 Tj
+0 -52.3636 Td
+(3737 static int disk_1_present;) 18.662 Tj
+0 -53.6727 Td
+(3738 static int disk_queue;) 16.254 Tj
+0 -54.9818 Td
+(3739 ) 3.01 Tj
+0 -56.2909 Td
+(3740 static int ide_probe_disk1\(void\);) 22.876 Tj
+0 -57.6 Td
+(3741 ) 3.01 Tj
+0 -58.9091 Td
+(3742 // Wait for IDE disk to become ready.) 25.284 Tj
+0 -60.2181 Td
+(3743 static int) 9.03 Tj
+0 -61.5272 Td
+(3744 ide_wait_ready\(int check_error\)) 21.672 Tj
+0 -62.8363 Td
+(3745 {) 3.612 Tj
+0 -64.1454 Td
+(3746 int r;) 7.826 Tj
+0 -65.4545 Td
+(3747 ) 3.01 Tj
+0 -66.7636 Td
+(3748 while\(\(\(r = inb\(0x1F7\)\) & \(IDE_BSY|IDE_DRDY\)\) != IDE_DRDY\)) 39.13 Tj
+0 -68.0727 Td
+(3749 ;) 6.02 Tj
+0 -72 Td
+(Sheet 37) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/ide.c Page 2) 21.672 Tj
+0 -3.92728 Td
+(3750 if\(check_error && \(r & \(IDE_DF|IDE_ERR\)\) != 0\)) 31.906 Tj
+0 -5.23637 Td
+(3751 return -1;) 11.438 Tj
+0 -6.54546 Td
+(3752 return 0;) 9.632 Tj
+0 -7.85455 Td
+(3753 }) 3.612 Tj
+0 -9.16364 Td
+(3754 ) 3.01 Tj
+0 -10.4727 Td
+(3755 void) 5.418 Tj
+0 -11.7818 Td
+(3756 ide_init\(void\)) 11.438 Tj
+0 -13.0909 Td
+(3757 {) 3.612 Tj
+0 -14.4 Td
+(3758 initlock\(&ide_lock, "ide"\);) 20.468 Tj
+0 -15.7091 Td
+(3759 irq_enable\(IRQ_IDE\);) 16.254 Tj
+0 -17.0182 Td
+(3760 ioapic_enable\(IRQ_IDE, ncpu - 1\);) 24.08 Tj
+0 -18.3273 Td
+(3761 ide_wait_ready\(0\);) 15.05 Tj
+0 -19.6364 Td
+(3762 disk_1_present = ide_probe_disk1\(\);) 25.284 Tj
+0 -20.9455 Td
+(3763 }) 3.612 Tj
+0 -22.2545 Td
+(3764 ) 3.01 Tj
+0 -23.5636 Td
+(3765 // Probe to see if disk 1 exists \(we assume disk 0 exists\).) 38.528 Tj
+0 -24.8727 Td
+(3766 static int) 9.03 Tj
+0 -26.1818 Td
+(3767 ide_probe_disk1\(void\)) 15.652 Tj
+0 -27.4909 Td
+(3768 {) 3.612 Tj
+0 -28.8 Td
+(3769 int r, x;) 9.632 Tj
+0 -30.1091 Td
+(3770 ) 3.01 Tj
+0 -31.4182 Td
+(3771 // wait for Device 0 to be ready) 23.478 Tj
+0 -32.7273 Td
+(3772 ide_wait_ready\(0\);) 15.05 Tj
+0 -34.0364 Td
+(3773 ) 3.01 Tj
+0 -35.3454 Td
+(3774 // switch to Device 1) 16.856 Tj
+0 -36.6545 Td
+(3775 outb\(0x1F6, 0xE0 | \(1<<4\)\);) 20.468 Tj
+0 -37.9636 Td
+(3776 ) 3.01 Tj
+0 -39.2727 Td
+(3777 // check for Device 1 to be ready for a while) 31.304 Tj
+0 -40.5818 Td
+(3778 for\(x = 0; x < 1000 && \(r = inb\(0x1F7\)\) == 0; x++\)) 34.314 Tj
+0 -41.8909 Td
+(3779 ;) 6.02 Tj
+0 -43.2 Td
+(3780 ) 3.01 Tj
+0 -44.5091 Td
+(3781 // switch back to Device 0) 19.866 Tj
+0 -45.8182 Td
+(3782 outb\(0x1F6, 0xE0 | \(0<<4\)\);) 20.468 Tj
+0 -47.1272 Td
+(3783 ) 3.01 Tj
+0 -48.4363 Td
+(3784 return x < 1000;) 13.846 Tj
+0 -49.7454 Td
+(3785 }) 3.612 Tj
+0 -51.0545 Td
+(3786 ) 3.01 Tj
+0 -52.3636 Td
+(3787 // Interrupt handler - wake up the request that just finished.) 40.334 Tj
+0 -53.6727 Td
+(3788 void) 5.418 Tj
+0 -54.9818 Td
+(3789 ide_intr\(void\)) 11.438 Tj
+0 -56.2909 Td
+(3790 {) 3.612 Tj
+0 -57.6 Td
+(3791 acquire\(&ide_lock\);) 15.652 Tj
+0 -58.9091 Td
+(3792 wakeup\(&request[tail]\);) 18.06 Tj
+0 -60.2181 Td
+(3793 release\(&ide_lock\);) 15.652 Tj
+0 -61.5272 Td
+(3794 }) 3.612 Tj
+0 -62.8363 Td
+(3795 ) 3.01 Tj
+0 -64.1454 Td
+(3796 ) 3.01 Tj
+0 -65.4545 Td
+(3797 ) 3.01 Tj
+0 -66.7636 Td
+(3798 ) 3.01 Tj
+0 -68.0727 Td
+(3799 ) 3.01 Tj
+0 -72 Td
+(Sheet 37) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 45 45
+%%BeginPageSetup
+%%PageOrientation: Landscape
+pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
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+1 w
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+q
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+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
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+(Sep 8 11:37 2006 xv6/ide.c Page 3) 21.672 Tj
+0 -3.92728 Td
+(3800 // Start the next request in the queue.) 26.488 Tj
+0 -5.23637 Td
+(3801 static void) 9.632 Tj
+0 -6.54546 Td
+(3802 ide_start_request \(void\)) 17.458 Tj
+0 -7.85455 Td
+(3803 {) 3.612 Tj
+0 -9.16364 Td
+(3804 struct ide_request *r;) 17.458 Tj
+0 -10.4727 Td
+(3805 ) 3.01 Tj
+0 -11.7818 Td
+(3806 if\(head != tail\) {) 15.05 Tj
+0 -13.0909 Td
+(3807 r = &request[tail];) 16.856 Tj
+0 -14.4 Td
+(3808 ide_wait_ready\(0\);) 16.254 Tj
+0 -15.7091 Td
+(3809 outb\(0x3f6, 0\); // generate interrupt) 28.294 Tj
+0 -17.0182 Td
+(3810 outb\(0x1F2, r->nsecs\);) 18.662 Tj
+0 -18.3273 Td
+(3811 outb\(0x1F3, r->secno & 0xFF\);) 22.876 Tj
+0 -19.6364 Td
+(3812 outb\(0x1F4, \(r->secno >> 8\) & 0xFF\);) 27.09 Tj
+0 -20.9455 Td
+(3813 outb\(0x1F5, \(r->secno >> 16\) & 0xFF\);) 27.692 Tj
+0 -22.2545 Td
+(3814 outb\(0x1F6, 0xE0 | \(\(r->diskno&1\)<<4\) | \(\(r->secno>>24\)&0x0F\)\);) 43.344 Tj
+0 -23.5636 Td
+(3815 if\(r->read\)) 12.04 Tj
+0 -24.8727 Td
+(3816 outb\(0x1F7, IDE_CMD_READ\);) 22.274 Tj
+0 -26.1818 Td
+(3817 else {) 9.03 Tj
+0 -27.4909 Td
+(3818 outb\(0x1F7, IDE_CMD_WRITE\);) 22.876 Tj
+0 -28.8 Td
+(3819 outsl\(0x1F0, r->addr, 512/4\);) 24.08 Tj
+0 -30.1091 Td
+(3820 }) 6.02 Tj
+0 -31.4182 Td
+(3821 }) 4.816 Tj
+0 -32.7273 Td
+(3822 }) 3.612 Tj
+0 -34.0364 Td
+(3823 ) 3.01 Tj
+0 -35.3454 Td
+(3824 // Run an entire disk operation.) 22.274 Tj
+0 -36.6545 Td
+(3825 void) 5.418 Tj
+0 -37.9636 Td
+(3826 ide_rw\(int diskno, uint secno, void *addr, uint nsecs, int read\)) 41.538 Tj
+0 -39.2727 Td
+(3827 {) 3.612 Tj
+0 -40.5818 Td
+(3828 struct ide_request *r;) 17.458 Tj
+0 -41.8909 Td
+(3829 ) 3.01 Tj
+0 -43.2 Td
+(3830 if\(diskno && !disk_1_present\)) 21.672 Tj
+0 -44.5091 Td
+(3831 panic\("ide disk 1 not present"\);) 24.682 Tj
+0 -45.8182 Td
+(3832 ) 3.01 Tj
+0 -47.1272 Td
+(3833 acquire\(&ide_lock\);) 15.652 Tj
+0 -48.4363 Td
+(3834 ) 3.01 Tj
+0 -49.7454 Td
+(3835 // Add request to queue.) 18.662 Tj
+0 -51.0545 Td
+(3836 while\(\(head + 1\) % NREQUEST == tail\)) 25.886 Tj
+0 -52.3636 Td
+(3837 sleep\(&disk_queue, &ide_lock\);) 23.478 Tj
+0 -53.6727 Td
+(3838 ) 3.01 Tj
+0 -54.9818 Td
+(3839 r = &request[head];) 15.652 Tj
+0 -56.2909 Td
+(3840 r->secno = secno;) 14.448 Tj
+0 -57.6 Td
+(3841 r->addr = addr;) 13.244 Tj
+0 -58.9091 Td
+(3842 r->nsecs = nsecs;) 14.448 Tj
+0 -60.2181 Td
+(3843 r->diskno = diskno;) 15.652 Tj
+0 -61.5272 Td
+(3844 r->read = read;) 13.244 Tj
+0 -62.8363 Td
+(3845 head = \(head + 1\) % NREQUEST;) 21.672 Tj
+0 -64.1454 Td
+(3846 ) 3.01 Tj
+0 -65.4545 Td
+(3847 // Start request if necessary.) 22.274 Tj
+0 -66.7636 Td
+(3848 ide_start_request\(\);) 16.254 Tj
+0 -68.0727 Td
+(3849 ) 3.01 Tj
+0 -72 Td
+(Sheet 38) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/ide.c Page 4) 21.672 Tj
+0 -3.92728 Td
+(3850 // Wait for request to finish.) 22.274 Tj
+0 -5.23637 Td
+(3851 sleep\(r, &ide_lock\);) 16.254 Tj
+0 -6.54546 Td
+(3852 ) 3.01 Tj
+0 -7.85455 Td
+(3853 // Finish request.) 15.05 Tj
+0 -9.16364 Td
+(3854 if\(read\){) 9.632 Tj
+0 -10.4727 Td
+(3855 if\(ide_wait_ready\(1\) >= 0\)) 21.07 Tj
+0 -11.7818 Td
+(3856 insl\(0x1F0, addr, 512/4\);) 21.672 Tj
+0 -13.0909 Td
+(3857 }) 4.816 Tj
+0 -14.4 Td
+(3858 ) 3.01 Tj
+0 -15.7091 Td
+(3859 // Remove request from queue.) 21.672 Tj
+0 -17.0182 Td
+(3860 if\(\(head + 1\) % NREQUEST == tail\)) 24.08 Tj
+0 -18.3273 Td
+(3861 wakeup\(&disk_queue\);) 17.458 Tj
+0 -19.6364 Td
+(3862 tail = \(tail + 1\) % NREQUEST;) 21.672 Tj
+0 -20.9455 Td
+(3863 ) 3.01 Tj
+0 -22.2545 Td
+(3864 // Start next request in queue, if any.) 27.692 Tj
+0 -23.5636 Td
+(3865 ide_start_request\(\);) 16.254 Tj
+0 -24.8727 Td
+(3866 ) 3.01 Tj
+0 -26.1818 Td
+(3867 release\(&ide_lock\);) 15.652 Tj
+0 -27.4909 Td
+(3868 }) 3.612 Tj
+0 -28.8 Td
+(3869 ) 3.01 Tj
+0 -30.1091 Td
+(3870 // Synchronous disk write.) 18.662 Tj
+0 -31.4182 Td
+(3871 int) 4.816 Tj
+0 -32.7273 Td
+(3872 ide_write\(int diskno, uint secno, const void *src, uint nsecs\)) 40.334 Tj
+0 -34.0364 Td
+(3873 {) 3.612 Tj
+0 -35.3454 Td
+(3874 int r;) 7.826 Tj
+0 -36.6545 Td
+(3875 ) 3.01 Tj
+0 -37.9636 Td
+(3876 if\(nsecs > 256\)) 13.244 Tj
+0 -39.2727 Td
+(3877 panic\("ide_write"\);) 16.856 Tj
+0 -40.5818 Td
+(3878 ) 3.01 Tj
+0 -41.8909 Td
+(3879 ide_wait_ready\(0\);) 15.05 Tj
+0 -43.2 Td
+(3880 ) 3.01 Tj
+0 -44.5091 Td
+(3881 outb\(0x1F2, nsecs\);) 15.652 Tj
+0 -45.8182 Td
+(3882 outb\(0x1F3, secno & 0xFF\);) 19.866 Tj
+0 -47.1272 Td
+(3883 outb\(0x1F4, \(secno >> 8\) & 0xFF\);) 24.08 Tj
+0 -48.4363 Td
+(3884 outb\(0x1F5, \(secno >> 16\) & 0xFF\);) 24.682 Tj
+0 -49.7454 Td
+(3885 outb\(0x1F6, 0xE0 | \(\(diskno&1\)<<4\) | \(\(secno>>24\)&0x0F\)\);) 38.528 Tj
+0 -51.0545 Td
+(3886 outb\(0x1F7, 0x30\); // CMD 0x30 means write sector) 35.518 Tj
+0 -52.3636 Td
+(3887 ) 3.01 Tj
+0 -53.6727 Td
+(3888 for\(; nsecs > 0; nsecs--, src += 512\) {) 27.692 Tj
+0 -54.9818 Td
+(3889 if\(\(r = ide_wait_ready\(1\)\) < 0\)) 24.08 Tj
+0 -56.2909 Td
+(3890 return r;) 12.04 Tj
+0 -57.6 Td
+(3891 outsl\(0x1F0, src, 512/4\);) 20.468 Tj
+0 -58.9091 Td
+(3892 }) 4.816 Tj
+0 -60.2181 Td
+(3893 ) 3.01 Tj
+0 -61.5272 Td
+(3894 return 0;) 9.632 Tj
+0 -62.8363 Td
+(3895 }) 3.612 Tj
+0 -64.1454 Td
+(3896 ) 3.01 Tj
+0 -65.4545 Td
+(3897 ) 3.01 Tj
+0 -66.7636 Td
+(3898 ) 3.01 Tj
+0 -68.0727 Td
+(3899 ) 3.01 Tj
+0 -72 Td
+(Sheet 38) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 46 46
+%%BeginPageSetup
+%%PageOrientation: Landscape
+__tumble pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
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+1 w
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+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
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+(Sep 8 11:37 2006 xv6/bio.c Page 1) 21.672 Tj
+0 -3.92728 Td
+(3900 // Buffer cache.) 12.642 Tj
+0 -5.23637 Td
+(3901 //) 4.214 Tj
+0 -6.54546 Td
+(3902 // The buffer cache is a linked list of buf structures) 35.518 Tj
+0 -7.85455 Td
+(3903 // holding cached copies of disk block contents.) 31.906 Tj
+0 -9.16364 Td
+(3904 // Each buf has two state bits B_BUSY and B_VALID.) 33.11 Tj
+0 -10.4727 Td
+(3905 // If B_BUSY is set, it means that some code is currently) 37.324 Tj
+0 -11.7818 Td
+(3906 // editing buf, so other code is not allowed to look at it.) 38.528 Tj
+0 -13.0909 Td
+(3907 // To wait for a buffer that is B_BUSY, sleep on buf.) 34.916 Tj
+0 -14.4 Td
+(3908 // \(See bget below.\)) 15.05 Tj
+0 -15.7091 Td
+(3909 //) 4.214 Tj
+0 -17.0182 Td
+(3910 // If B_VALID is set, it means that the memory contents) 36.12 Tj
+0 -18.3273 Td
+(3911 // have been initialized by reading them off the disk.) 35.518 Tj
+0 -19.6364 Td
+(3912 // \(Conversely, if B_VALID is not set, the memory contents) 37.926 Tj
+0 -20.9455 Td
+(3913 // of buf must be initialized, often by calling bread,) 35.518 Tj
+0 -22.2545 Td
+(3914 // before being used.\)) 16.254 Tj
+0 -23.5636 Td
+(3915 //) 4.214 Tj
+0 -24.8727 Td
+(3916 // After making changes to a buf's memory, call bwrite to flush) 40.936 Tj
+0 -26.1818 Td
+(3917 // the changes out to disk, to keep the disk and memory copies) 40.334 Tj
+0 -27.4909 Td
+(3918 // in sync.) 9.632 Tj
+0 -28.8 Td
+(3919 //) 4.214 Tj
+0 -30.1091 Td
+(3920 // When finished with a buffer, call brelse to release the buffer) 42.14 Tj
+0 -31.4182 Td
+(3921 // \(i.e., clear B_BUSY\), so that others can access it.) 35.518 Tj
+0 -32.7273 Td
+(3922 //) 4.214 Tj
+0 -34.0364 Td
+(3923 // Bufs that are not B_BUSY are fair game for reuse for other) 39.732 Tj
+0 -35.3454 Td
+(3924 // disk blocks. It is not allowed to use a buf after calling brelse.) 44.548 Tj
+0 -36.6545 Td
+(3925 ) 3.01 Tj
+0 -37.9636 Td
+(3926 #include "types.h") 13.846 Tj
+0 -39.2727 Td
+(3927 #include "param.h") 13.846 Tj
+0 -40.5818 Td
+(3928 #include "x86.h") 12.642 Tj
+0 -41.8909 Td
+(3929 #include "mmu.h") 12.642 Tj
+0 -43.2 Td
+(3930 #include "proc.h") 13.244 Tj
+0 -44.5091 Td
+(3931 #include "defs.h") 13.244 Tj
+0 -45.8182 Td
+(3932 #include "spinlock.h") 15.652 Tj
+0 -47.1272 Td
+(3933 #include "buf.h") 12.642 Tj
+0 -48.4363 Td
+(3934 ) 3.01 Tj
+0 -49.7454 Td
+(3935 struct buf buf[NBUF];) 15.652 Tj
+0 -51.0545 Td
+(3936 struct spinlock buf_table_lock;) 21.672 Tj
+0 -52.3636 Td
+(3937 ) 3.01 Tj
+0 -53.6727 Td
+(3938 // Linked list of all buffers, through prev/next.) 32.508 Tj
+0 -54.9818 Td
+(3939 // bufhead->next is most recently used.) 26.488 Tj
+0 -56.2909 Td
+(3940 // bufhead->tail is least recently used.) 27.09 Tj
+0 -57.6 Td
+(3941 struct buf bufhead;) 14.448 Tj
+0 -58.9091 Td
+(3942 ) 3.01 Tj
+0 -60.2181 Td
+(3943 void) 5.418 Tj
+0 -61.5272 Td
+(3944 binit\(void\)) 9.632 Tj
+0 -62.8363 Td
+(3945 {) 3.612 Tj
+0 -64.1454 Td
+(3946 struct buf *b;) 12.642 Tj
+0 -65.4545 Td
+(3947 ) 3.01 Tj
+0 -66.7636 Td
+(3948 initlock\(&buf_table_lock, "buf_table"\);) 27.692 Tj
+0 -68.0727 Td
+(3949 ) 3.01 Tj
+0 -72 Td
+(Sheet 39) 4.816 Tj
+Q
+Q
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+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
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+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/bio.c Page 2) 21.672 Tj
+0 -3.92728 Td
+(3950 // Create linked list of buffers) 23.478 Tj
+0 -5.23637 Td
+(3951 bufhead.prev = &bufhead;) 18.662 Tj
+0 -6.54546 Td
+(3952 bufhead.next = &bufhead;) 18.662 Tj
+0 -7.85455 Td
+(3953 for\(b = buf; b < buf+NBUF; b++\){) 23.478 Tj
+0 -9.16364 Td
+(3954 b->next = bufhead.next;) 19.264 Tj
+0 -10.4727 Td
+(3955 b->prev = &bufhead;) 16.856 Tj
+0 -11.7818 Td
+(3956 bufhead.next->prev = b;) 19.264 Tj
+0 -13.0909 Td
+(3957 bufhead.next = b;) 15.652 Tj
+0 -14.4 Td
+(3958 }) 4.816 Tj
+0 -15.7091 Td
+(3959 }) 3.612 Tj
+0 -17.0182 Td
+(3960 ) 3.01 Tj
+0 -18.3273 Td
+(3961 // Look through buffer cache for block n on device dev.) 36.12 Tj
+0 -19.6364 Td
+(3962 // If not found, allocate fresh block.) 25.886 Tj
+0 -20.9455 Td
+(3963 // In either case, return locked buffer.) 27.09 Tj
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+(3964 static struct buf*) 13.846 Tj
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+(3965 bget\(uint dev, uint sector\)) 19.264 Tj
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+(3967 struct buf *b;) 12.642 Tj
+0 -27.4909 Td
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+(3969 acquire\(&buf_table_lock\);) 19.264 Tj
+0 -30.1091 Td
+(3970 ) 3.01 Tj
+0 -31.4182 Td
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+0 -32.7273 Td
+(3972 for\(b = bufhead.next; b != &bufhead; b = b->next\)) 34.916 Tj
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+0 -35.3454 Td
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+0 -36.6545 Td
+(3975 break;) 11.438 Tj
+0 -37.9636 Td
+(3976 ) 3.01 Tj
+0 -39.2727 Td
+(3977 if\(b != &bufhead\){) 16.254 Tj
+0 -40.5818 Td
+(3978 if\(b->flags & B_BUSY\){) 19.866 Tj
+0 -41.8909 Td
+(3979 sleep\(buf, &buf_table_lock\);) 24.682 Tj
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+(3981 b->flags |= B_BUSY;) 19.264 Tj
+0 -45.8182 Td
+(3982 // b->flags &= ~B_VALID; // Force reread from disk) 37.926 Tj
+0 -47.1272 Td
+(3983 release\(&buf_table_lock\);) 22.876 Tj
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+(3984 return b;) 13.244 Tj
+0 -49.7454 Td
+(3985 }) 7.224 Tj
+0 -51.0545 Td
+(3986 } else {) 10.234 Tj
+0 -52.3636 Td
+(3987 for\(b = bufhead.prev; b != &bufhead; b = b->prev\){) 36.722 Tj
+0 -53.6727 Td
+(3988 if\(\(b->flags & B_BUSY\) == 0\){) 25.284 Tj
+0 -54.9818 Td
+(3989 b->flags = B_BUSY;) 19.866 Tj
+0 -56.2909 Td
+(3990 b->dev = dev;) 16.856 Tj
+0 -57.6 Td
+(3991 b->sector = sector;) 20.468 Tj
+0 -58.9091 Td
+(3992 release\(&buf_table_lock\);) 24.08 Tj
+0 -60.2181 Td
+(3993 return b;) 14.448 Tj
+0 -61.5272 Td
+(3994 }) 8.428 Tj
+0 -62.8363 Td
+(3995 }) 7.224 Tj
+0 -64.1454 Td
+(3996 panic\("bget: no buffers"\);) 22.274 Tj
+0 -65.4545 Td
+(3997 }) 6.02 Tj
+0 -66.7636 Td
+(3998 }) 4.816 Tj
+0 -68.0727 Td
+(3999 }) 3.612 Tj
+0 -72 Td
+(Sheet 39) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
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+W
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+(4000 // Read buf's contents from disk.) 22.876 Tj
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+(4007 if\(b->flags & B_VALID\)) 17.458 Tj
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+(4009 ) 3.01 Tj
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+(4010 ide_rw\(dev & 0xff, sector, b->data, 1, 1\);) 29.498 Tj
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+(4011 b->flags |= B_VALID;) 16.254 Tj
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+(4012 ) 3.01 Tj
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+(4013 return b;) 9.632 Tj
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+0 -24.8727 Td
+(4016 // Write buf's contents to disk.) 22.274 Tj
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+(4017 // Must be locked.) 13.846 Tj
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+(4021 if\(\(b->flags & B_BUSY\) == 0\)) 21.07 Tj
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+(4022 panic\("bwrite"\);) 15.05 Tj
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+(4024 ide_rw\(b->dev & 0xff, sector, b->data, 1, 0\);) 31.304 Tj
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+(4028 // Release the buffer buf.) 18.662 Tj
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+(4030 brelse\(struct buf *b\)) 15.652 Tj
+0 -44.5091 Td
+(4031 {) 3.612 Tj
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+(4032 if\(\(b->flags & B_BUSY\) == 0\)) 21.07 Tj
+0 -47.1272 Td
+(4033 panic\("brelse"\);) 15.05 Tj
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+(4035 acquire\(&buf_table_lock\);) 19.264 Tj
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+(4037 b->next->prev = b->prev;) 18.662 Tj
+0 -53.6727 Td
+(4038 b->prev->next = b->next;) 18.662 Tj
+0 -54.9818 Td
+(4039 b->next = bufhead.next;) 18.06 Tj
+0 -56.2909 Td
+(4040 b->prev = &bufhead;) 15.652 Tj
+0 -57.6 Td
+(4041 bufhead.next->prev = b;) 18.06 Tj
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+(4042 bufhead.next = b;) 14.448 Tj
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+(4043 ) 3.01 Tj
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+(4049 ) 3.01 Tj
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+W
+q
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+[1 0 0 1 0 0] Tm
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+(4050 #include "types.h") 13.846 Tj
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+(4051 #include "stat.h") 13.244 Tj
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+(4052 #include "param.h") 13.846 Tj
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+(4053 #include "x86.h") 12.642 Tj
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+(4054 #include "mmu.h") 12.642 Tj
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+(4055 #include "proc.h") 13.244 Tj
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+(4056 #include "defs.h") 13.244 Tj
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+(4057 #include "spinlock.h") 15.652 Tj
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+(4058 #include "buf.h") 12.642 Tj
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+(4059 #include "fs.h") 12.04 Tj
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+(4060 #include "fsvar.h") 13.846 Tj
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+(4061 #include "dev.h") 12.642 Tj
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+(4062 ) 3.01 Tj
+0 -20.9455 Td
+(4063 // Inode table. The inode table is an in-memory cache of the) 39.732 Tj
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+(4064 // on-disk inode structures. If an inode in the table has a non-zero) 44.548 Tj
+0 -23.5636 Td
+(4065 // reference count, then some open files refer to it and it must stay) 44.548 Tj
+0 -24.8727 Td
+(4066 // in memory. If an inode has a zero reference count, it is only in) 43.946 Tj
+0 -26.1818 Td
+(4067 // memory as a cache in hopes of being used again \(avoiding a disk read\).) 46.956 Tj
+0 -27.4909 Td
+(4068 // Any inode with reference count zero can be evicted from the table.) 44.548 Tj
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+(4069 //) 4.214 Tj
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+(4070 // In addition to having a reference count, inodes can be marked busy) 44.548 Tj
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+0 -32.7273 Td
+(4072 // inode, and others are not allowed to look at it.) 33.712 Tj
+0 -34.0364 Td
+(4073 // This locking can last for a long) 24.08 Tj
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+(4074 // time \(for example, if the inode is busy during a disk access\),) 42.14 Tj
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+(4075 // so we don't use spin locks. Instead, if a process wants to use) 42.742 Tj
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+(4076 // a particular inode, it must sleep\(ip\) to wait for it to be not busy.) 45.752 Tj
+0 -39.2727 Td
+(4077 // See iget below.) 13.846 Tj
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+0 -45.8182 Td
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+(4085 {) 3.612 Tj
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+(4086 initlock\(&inode_table_lock, "inode_table"\);) 30.1 Tj
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+(4088 ) 3.01 Tj
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+(4090 ) 3.01 Tj
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+(4092 ) 3.01 Tj
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+(4093 ) 3.01 Tj
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+(4094 ) 3.01 Tj
+0 -62.8363 Td
+(4095 ) 3.01 Tj
+0 -64.1454 Td
+(4096 ) 3.01 Tj
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+(4097 ) 3.01 Tj
+0 -66.7636 Td
+(4098 ) 3.01 Tj
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+(4099 ) 3.01 Tj
+0 -72 Td
+(Sheet 40) 4.816 Tj
+Q
+Q
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+showpage
+%%PageTrailer
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+q
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+W
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+(Sep 8 11:37 2006 xv6/fs.c Page 2) 21.07 Tj
+0 -3.92728 Td
+(4100 // Allocate a disk block.) 18.06 Tj
+0 -5.23637 Td
+(4101 static uint) 9.632 Tj
+0 -6.54546 Td
+(4102 balloc\(uint dev\)) 12.642 Tj
+0 -7.85455 Td
+(4103 {) 3.612 Tj
+0 -9.16364 Td
+(4104 int b;) 7.826 Tj
+0 -10.4727 Td
+(4105 struct buf *bp;) 13.244 Tj
+0 -11.7818 Td
+(4106 struct superblock *sb;) 17.458 Tj
+0 -13.0909 Td
+(4107 int bi = 0;) 10.836 Tj
+0 -14.4 Td
+(4108 int size;) 9.632 Tj
+0 -15.7091 Td
+(4109 int ninodes;) 11.438 Tj
+0 -17.0182 Td
+(4110 uchar m;) 9.03 Tj
+0 -18.3273 Td
+(4111 ) 3.01 Tj
+0 -19.6364 Td
+(4112 bp = bread\(dev, 1\);) 15.652 Tj
+0 -20.9455 Td
+(4113 sb = \(struct superblock*\) bp->data;) 25.284 Tj
+0 -22.2545 Td
+(4114 size = sb->size;) 13.846 Tj
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+(4115 ninodes = sb->ninodes;) 17.458 Tj
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+(4118 if\(b % BPB == 0\) {) 16.254 Tj
+0 -28.8 Td
+(4119 brelse\(bp\);) 13.244 Tj
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+(4120 bp = bread\(dev, BBLOCK\(b, ninodes\)\);) 28.294 Tj
+0 -31.4182 Td
+(4121 }) 6.02 Tj
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+(4122 bi = b % BPB;) 13.244 Tj
+0 -34.0364 Td
+(4123 m = 0x1 << \(bi % 8\);) 17.458 Tj
+0 -35.3454 Td
+(4124 if\(\(bp->data[bi/8] & m\) == 0\) { // is block free?) 35.518 Tj
+0 -36.6545 Td
+(4125 break;) 10.234 Tj
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+(4126 }) 6.02 Tj
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+(4128 if\(b >= size\)) 12.04 Tj
+0 -41.8909 Td
+(4129 panic\("balloc: out of blocks"\);) 24.08 Tj
+0 -43.2 Td
+(4130 ) 3.01 Tj
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+(4131 bp->data[bi/8] |= 0x1 << \(bi % 8\);) 24.682 Tj
+0 -45.8182 Td
+(4132 bwrite\(bp, BBLOCK\(b, ninodes\)\); // mark it allocated on disk) 40.936 Tj
+0 -47.1272 Td
+(4133 brelse\(bp\);) 10.836 Tj
+0 -48.4363 Td
+(4134 return b;) 9.632 Tj
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+(4149 ) 3.01 Tj
+0 -72 Td
+(Sheet 41) 4.816 Tj
+Q
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+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/fs.c Page 3) 21.07 Tj
+0 -3.92728 Td
+(4150 // Free a disk block.) 15.652 Tj
+0 -5.23637 Td
+(4151 static void) 9.632 Tj
+0 -6.54546 Td
+(4152 bfree\(int dev, uint b\)) 16.254 Tj
+0 -7.85455 Td
+(4153 {) 3.612 Tj
+0 -9.16364 Td
+(4154 struct buf *bp;) 13.244 Tj
+0 -10.4727 Td
+(4155 struct superblock *sb;) 17.458 Tj
+0 -11.7818 Td
+(4156 int bi;) 8.428 Tj
+0 -13.0909 Td
+(4157 int ninodes;) 11.438 Tj
+0 -14.4 Td
+(4158 uchar m;) 9.03 Tj
+0 -15.7091 Td
+(4159 ) 3.01 Tj
+0 -17.0182 Td
+(4160 bp = bread\(dev, 1\);) 15.652 Tj
+0 -18.3273 Td
+(4161 sb = \(struct superblock*\) bp->data;) 25.284 Tj
+0 -19.6364 Td
+(4162 ninodes = sb->ninodes;) 17.458 Tj
+0 -20.9455 Td
+(4163 brelse\(bp\);) 10.836 Tj
+0 -22.2545 Td
+(4164 ) 3.01 Tj
+0 -23.5636 Td
+(4165 bp = bread\(dev, b\);) 15.652 Tj
+0 -24.8727 Td
+(4166 memset\(bp->data, 0, BSIZE\);) 20.468 Tj
+0 -26.1818 Td
+(4167 bwrite\(bp, b\);) 12.642 Tj
+0 -27.4909 Td
+(4168 brelse\(bp\);) 10.836 Tj
+0 -28.8 Td
+(4169 ) 3.01 Tj
+0 -30.1091 Td
+(4170 bp = bread\(dev, BBLOCK\(b, ninodes\)\);) 25.886 Tj
+0 -31.4182 Td
+(4171 bi = b % BPB;) 12.04 Tj
+0 -32.7273 Td
+(4172 m = ~\(0x1 << \(bi %8\)\);) 17.458 Tj
+0 -34.0364 Td
+(4173 bp->data[bi/8] &= m;) 16.254 Tj
+0 -35.3454 Td
+(4174 bwrite\(bp, BBLOCK\(b, ninodes\)\); // mark it free on disk) 37.926 Tj
+0 -36.6545 Td
+(4175 brelse\(bp\);) 10.836 Tj
+0 -37.9636 Td
+(4176 }) 3.612 Tj
+0 -39.2727 Td
+(4177 ) 3.01 Tj
+0 -40.5818 Td
+(4178 // Find the inode with number inum on device dev) 31.906 Tj
+0 -41.8909 Td
+(4179 // and return an in-memory copy. Loads the inode) 32.508 Tj
+0 -43.2 Td
+(4180 // from disk into the in-core table if necessary.) 32.508 Tj
+0 -44.5091 Td
+(4181 // The returned inode has busy set and has its ref count incremented.) 44.548 Tj
+0 -45.8182 Td
+(4182 // Caller must iput the return value when done with it.) 36.12 Tj
+0 -47.1272 Td
+(4183 struct inode*) 10.836 Tj
+0 -48.4363 Td
+(4184 iget\(uint dev, uint inum\)) 18.06 Tj
+0 -49.7454 Td
+(4185 {) 3.612 Tj
+0 -51.0545 Td
+(4186 struct inode *ip, *nip;) 18.06 Tj
+0 -52.3636 Td
+(4187 struct dinode *dip;) 15.652 Tj
+0 -53.6727 Td
+(4188 struct buf *bp;) 13.244 Tj
+0 -54.9818 Td
+(4189 ) 3.01 Tj
+0 -56.2909 Td
+(4190 acquire\(&inode_table_lock\);) 20.468 Tj
+0 -57.6 Td
+(4191 ) 3.01 Tj
+0 -58.9091 Td
+(4192 loop:) 6.622 Tj
+0 -60.2181 Td
+(4193 nip = 0;) 9.03 Tj
+0 -61.5272 Td
+(4194 for\(ip = &inode[0]; ip < &inode[NINODE]; ip++\){) 32.508 Tj
+0 -62.8363 Td
+(4195 if\(ip->ref > 0 && ip->dev == dev && ip->inum == inum\){) 37.926 Tj
+0 -64.1454 Td
+(4196 if\(ip->busy\){) 14.448 Tj
+0 -65.4545 Td
+(4197 sleep\(ip, &inode_table_lock\);) 25.284 Tj
+0 -66.7636 Td
+(4198 // Since we droped inode_table_lock, ip might have been reused) 45.15 Tj
+0 -68.0727 Td
+(4199 // for some other inode entirely. Must start the scan over,) 43.946 Tj
+0 -72 Td
+(Sheet 41) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 49 49
+%%BeginPageSetup
+%%PageOrientation: Landscape
+pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/fs.c Page 4) 21.07 Tj
+0 -3.92728 Td
+(4200 // and hopefully this time we will find the inode we want) 42.14 Tj
+0 -5.23637 Td
+(4201 // and it will not be busy.) 24.08 Tj
+0 -6.54546 Td
+(4202 goto loop;) 13.846 Tj
+0 -7.85455 Td
+(4203 }) 7.224 Tj
+0 -9.16364 Td
+(4204 ip->ref++;) 12.642 Tj
+0 -10.4727 Td
+(4205 ip->busy = 1;) 14.448 Tj
+0 -11.7818 Td
+(4206 release\(&inode_table_lock\);) 22.876 Tj
+0 -13.0909 Td
+(4207 return ip;) 12.642 Tj
+0 -14.4 Td
+(4208 }) 6.02 Tj
+0 -15.7091 Td
+(4209 if\(nip == 0 && ip->ref == 0\)) 22.274 Tj
+0 -17.0182 Td
+(4210 nip = ip;) 12.04 Tj
+0 -18.3273 Td
+(4211 }) 4.816 Tj
+0 -19.6364 Td
+(4212 ) 3.01 Tj
+0 -20.9455 Td
+(4213 if\(nip == 0\)) 11.438 Tj
+0 -22.2545 Td
+(4214 panic\("out of inodes"\);) 19.264 Tj
+0 -23.5636 Td
+(4215 ) 3.01 Tj
+0 -24.8727 Td
+(4216 nip->dev = dev;) 13.244 Tj
+0 -26.1818 Td
+(4217 nip->inum = inum;) 14.448 Tj
+0 -27.4909 Td
+(4218 nip->ref = 1;) 12.04 Tj
+0 -28.8 Td
+(4219 nip->busy = 1;) 12.642 Tj
+0 -30.1091 Td
+(4220 ) 3.01 Tj
+0 -31.4182 Td
+(4221 release\(&inode_table_lock\);) 20.468 Tj
+0 -32.7273 Td
+(4222 ) 3.01 Tj
+0 -34.0364 Td
+(4223 bp = bread\(dev, IBLOCK\(inum\)\);) 22.274 Tj
+0 -35.3454 Td
+(4224 dip = &\(\(struct dinode*\)\(bp->data\)\)[inum % IPB];) 33.11 Tj
+0 -36.6545 Td
+(4225 nip->type = dip->type;) 17.458 Tj
+0 -37.9636 Td
+(4226 nip->major = dip->major;) 18.662 Tj
+0 -39.2727 Td
+(4227 nip->minor = dip->minor;) 18.662 Tj
+0 -40.5818 Td
+(4228 nip->nlink = dip->nlink;) 18.662 Tj
+0 -41.8909 Td
+(4229 nip->size = dip->size;) 17.458 Tj
+0 -43.2 Td
+(4230 memmove\(nip->addrs, dip->addrs, sizeof\(nip->addrs\)\);) 35.518 Tj
+0 -44.5091 Td
+(4231 brelse\(bp\);) 10.836 Tj
+0 -45.8182 Td
+(4232 ) 3.01 Tj
+0 -47.1272 Td
+(4233 return nip;) 10.836 Tj
+0 -48.4363 Td
+(4234 }) 3.612 Tj
+0 -49.7454 Td
+(4235 ) 3.01 Tj
+0 -51.0545 Td
+(4236 ) 3.01 Tj
+0 -52.3636 Td
+(4237 ) 3.01 Tj
+0 -53.6727 Td
+(4238 ) 3.01 Tj
+0 -54.9818 Td
+(4239 ) 3.01 Tj
+0 -56.2909 Td
+(4240 ) 3.01 Tj
+0 -57.6 Td
+(4241 ) 3.01 Tj
+0 -58.9091 Td
+(4242 ) 3.01 Tj
+0 -60.2181 Td
+(4243 ) 3.01 Tj
+0 -61.5272 Td
+(4244 ) 3.01 Tj
+0 -62.8363 Td
+(4245 ) 3.01 Tj
+0 -64.1454 Td
+(4246 ) 3.01 Tj
+0 -65.4545 Td
+(4247 ) 3.01 Tj
+0 -66.7636 Td
+(4248 ) 3.01 Tj
+0 -68.0727 Td
+(4249 ) 3.01 Tj
+0 -72 Td
+(Sheet 42) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/fs.c Page 5) 21.07 Tj
+0 -3.92728 Td
+(4250 // Copy inode in memory, which has changed, to disk.) 34.314 Tj
+0 -5.23637 Td
+(4251 // Caller must have locked ip.) 21.07 Tj
+0 -6.54546 Td
+(4252 void) 5.418 Tj
+0 -7.85455 Td
+(4253 iupdate\(struct inode *ip\)) 18.06 Tj
+0 -9.16364 Td
+(4254 {) 3.612 Tj
+0 -10.4727 Td
+(4255 struct buf *bp;) 13.244 Tj
+0 -11.7818 Td
+(4256 struct dinode *dip;) 15.652 Tj
+0 -13.0909 Td
+(4257 ) 3.01 Tj
+0 -14.4 Td
+(4258 bp = bread\(ip->dev, IBLOCK\(ip->inum\)\);) 27.09 Tj
+0 -15.7091 Td
+(4259 dip = &\(\(struct dinode*\)\(bp->data\)\)[ip->inum % IPB];) 35.518 Tj
+0 -17.0182 Td
+(4260 dip->type = ip->type;) 16.856 Tj
+0 -18.3273 Td
+(4261 dip->major = ip->major;) 18.06 Tj
+0 -19.6364 Td
+(4262 dip->minor = ip->minor;) 18.06 Tj
+0 -20.9455 Td
+(4263 dip->nlink = ip->nlink;) 18.06 Tj
+0 -22.2545 Td
+(4264 dip->size = ip->size;) 16.856 Tj
+0 -23.5636 Td
+(4265 memmove\(dip->addrs, ip->addrs, sizeof\(ip->addrs\)\);) 34.314 Tj
+0 -24.8727 Td
+(4266 bwrite\(bp, IBLOCK\(ip->inum\)\); // mark it allocated on the disk) 42.742 Tj
+0 -26.1818 Td
+(4267 brelse\(bp\);) 10.836 Tj
+0 -27.4909 Td
+(4268 }) 3.612 Tj
+0 -28.8 Td
+(4269 ) 3.01 Tj
+0 -30.1091 Td
+(4270 // Allocate a new inode with the given type) 28.896 Tj
+0 -31.4182 Td
+(4271 // from the file system on device dev.) 25.886 Tj
+0 -32.7273 Td
+(4272 struct inode*) 10.836 Tj
+0 -34.0364 Td
+(4273 ialloc\(uint dev, short type\)) 19.866 Tj
+0 -35.3454 Td
+(4274 {) 3.612 Tj
+0 -36.6545 Td
+(4275 struct inode *ip;) 14.448 Tj
+0 -37.9636 Td
+(4276 struct dinode *dip = 0;) 18.06 Tj
+0 -39.2727 Td
+(4277 struct superblock *sb;) 17.458 Tj
+0 -40.5818 Td
+(4278 int ninodes;) 11.438 Tj
+0 -41.8909 Td
+(4279 int inum;) 9.632 Tj
+0 -43.2 Td
+(4280 struct buf *bp;) 13.244 Tj
+0 -44.5091 Td
+(4281 ) 3.01 Tj
+0 -45.8182 Td
+(4282 bp = bread\(dev, 1\);) 15.652 Tj
+0 -47.1272 Td
+(4283 sb = \(struct superblock*\) bp->data;) 25.284 Tj
+0 -48.4363 Td
+(4284 ninodes = sb->ninodes;) 17.458 Tj
+0 -49.7454 Td
+(4285 brelse\(bp\);) 10.836 Tj
+0 -51.0545 Td
+(4286 ) 3.01 Tj
+0 -52.3636 Td
+(4287 for\(inum = 1; inum < ninodes; inum++\) { // loop over inode blocks) 43.946 Tj
+0 -53.6727 Td
+(4288 bp = bread\(dev, IBLOCK\(inum\)\);) 23.478 Tj
+0 -54.9818 Td
+(4289 dip = &\(\(struct dinode*\)\(bp->data\)\)[inum % IPB];) 34.314 Tj
+0 -56.2909 Td
+(4290 if\(dip->type == 0\) { // a free inode) 27.692 Tj
+0 -57.6 Td
+(4291 break;) 10.234 Tj
+0 -58.9091 Td
+(4292 }) 6.02 Tj
+0 -60.2181 Td
+(4293 brelse\(bp\);) 12.04 Tj
+0 -61.5272 Td
+(4294 }) 4.816 Tj
+0 -62.8363 Td
+(4295 ) 3.01 Tj
+0 -64.1454 Td
+(4296 if\(inum >= ninodes\)) 15.652 Tj
+0 -65.4545 Td
+(4297 panic\("ialloc: no inodes left"\);) 24.682 Tj
+0 -66.7636 Td
+(4298 ) 3.01 Tj
+0 -68.0727 Td
+(4299 ) 3.01 Tj
+0 -72 Td
+(Sheet 42) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 50 50
+%%BeginPageSetup
+%%PageOrientation: Landscape
+__tumble pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/fs.c Page 6) 21.07 Tj
+0 -3.92728 Td
+(4300 memset\(dip, 0, sizeof\(*dip\)\);) 21.672 Tj
+0 -5.23637 Td
+(4301 dip->type = type;) 14.448 Tj
+0 -6.54546 Td
+(4302 bwrite\(bp, IBLOCK\(inum\)\); // mark it allocated on the disk) 40.334 Tj
+0 -7.85455 Td
+(4303 brelse\(bp\);) 10.836 Tj
+0 -9.16364 Td
+(4304 ip = iget\(dev, inum\);) 16.856 Tj
+0 -10.4727 Td
+(4305 return ip;) 10.234 Tj
+0 -11.7818 Td
+(4306 }) 3.612 Tj
+0 -13.0909 Td
+(4307 ) 3.01 Tj
+0 -14.4 Td
+(4308 // Free the given inode from its file system.) 30.1 Tj
+0 -15.7091 Td
+(4309 static void) 9.632 Tj
+0 -17.0182 Td
+(4310 ifree\(struct inode *ip\)) 16.856 Tj
+0 -18.3273 Td
+(4311 {) 3.612 Tj
+0 -19.6364 Td
+(4312 ip->type = 0;) 12.04 Tj
+0 -20.9455 Td
+(4313 iupdate\(ip\);) 11.438 Tj
+0 -22.2545 Td
+(4314 }) 3.612 Tj
+0 -23.5636 Td
+(4315 ) 3.01 Tj
+0 -24.8727 Td
+(4316 // Lock the given inode \(wait for it to be not busy,) 34.314 Tj
+0 -26.1818 Td
+(4317 // and then ip->busy\).) 16.254 Tj
+0 -27.4909 Td
+(4318 // Caller must already hold a reference to ip.) 30.702 Tj
+0 -28.8 Td
+(4319 // Otherwise, if all the references to ip go away,) 33.11 Tj
+0 -30.1091 Td
+(4320 // it might be reused underfoot.) 22.274 Tj
+0 -31.4182 Td
+(4321 void) 5.418 Tj
+0 -32.7273 Td
+(4322 ilock\(struct inode *ip\)) 16.856 Tj
+0 -34.0364 Td
+(4323 {) 3.612 Tj
+0 -35.3454 Td
+(4324 if\(ip->ref < 1\)) 13.244 Tj
+0 -36.6545 Td
+(4325 panic\("ilock"\);) 14.448 Tj
+0 -37.9636 Td
+(4326 ) 3.01 Tj
+0 -39.2727 Td
+(4327 acquire\(&inode_table_lock\);) 20.468 Tj
+0 -40.5818 Td
+(4328 ) 3.01 Tj
+0 -41.8909 Td
+(4329 while\(ip->busy\)) 13.244 Tj
+0 -43.2 Td
+(4330 sleep\(ip, &inode_table_lock\);) 22.876 Tj
+0 -44.5091 Td
+(4331 ip->busy = 1;) 12.04 Tj
+0 -45.8182 Td
+(4332 ) 3.01 Tj
+0 -47.1272 Td
+(4333 release\(&inode_table_lock\);) 20.468 Tj
+0 -48.4363 Td
+(4334 }) 3.612 Tj
+0 -49.7454 Td
+(4335 ) 3.01 Tj
+0 -51.0545 Td
+(4336 ) 3.01 Tj
+0 -52.3636 Td
+(4337 ) 3.01 Tj
+0 -53.6727 Td
+(4338 ) 3.01 Tj
+0 -54.9818 Td
+(4339 ) 3.01 Tj
+0 -56.2909 Td
+(4340 ) 3.01 Tj
+0 -57.6 Td
+(4341 ) 3.01 Tj
+0 -58.9091 Td
+(4342 ) 3.01 Tj
+0 -60.2181 Td
+(4343 ) 3.01 Tj
+0 -61.5272 Td
+(4344 ) 3.01 Tj
+0 -62.8363 Td
+(4345 ) 3.01 Tj
+0 -64.1454 Td
+(4346 ) 3.01 Tj
+0 -65.4545 Td
+(4347 ) 3.01 Tj
+0 -66.7636 Td
+(4348 ) 3.01 Tj
+0 -68.0727 Td
+(4349 ) 3.01 Tj
+0 -72 Td
+(Sheet 43) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/fs.c Page 7) 21.07 Tj
+0 -3.92728 Td
+(4350 // Caller holds reference to ip and has locked it.) 33.11 Tj
+0 -5.23637 Td
+(4351 // Caller no longer needs to examine / change it.) 32.508 Tj
+0 -6.54546 Td
+(4352 // Unlock it, but keep the reference.) 25.284 Tj
+0 -7.85455 Td
+(4353 void) 5.418 Tj
+0 -9.16364 Td
+(4354 iunlock\(struct inode *ip\)) 18.06 Tj
+0 -10.4727 Td
+(4355 {) 3.612 Tj
+0 -11.7818 Td
+(4356 if\(ip->busy != 1 || ip->ref < 1\)) 23.478 Tj
+0 -13.0909 Td
+(4357 panic\("iunlock"\);) 15.652 Tj
+0 -14.4 Td
+(4358 ) 3.01 Tj
+0 -15.7091 Td
+(4359 acquire\(&inode_table_lock\);) 20.468 Tj
+0 -17.0182 Td
+(4360 ) 3.01 Tj
+0 -18.3273 Td
+(4361 ip->busy = 0;) 12.04 Tj
+0 -19.6364 Td
+(4362 wakeup\(ip\);) 10.836 Tj
+0 -20.9455 Td
+(4363 ) 3.01 Tj
+0 -22.2545 Td
+(4364 release\(&inode_table_lock\);) 20.468 Tj
+0 -23.5636 Td
+(4365 }) 3.612 Tj
+0 -24.8727 Td
+(4366 ) 3.01 Tj
+0 -26.1818 Td
+(4367 // Return the disk block address of the nth block in inode ip.) 40.334 Tj
+0 -27.4909 Td
+(4368 uint) 5.418 Tj
+0 -28.8 Td
+(4369 bmap\(struct inode *ip, uint bn\)) 21.672 Tj
+0 -30.1091 Td
+(4370 {) 3.612 Tj
+0 -31.4182 Td
+(4371 unsigned x;) 10.836 Tj
+0 -32.7273 Td
+(4372 uint *a;) 9.03 Tj
+0 -34.0364 Td
+(4373 struct buf *inbp;) 14.448 Tj
+0 -35.3454 Td
+(4374 ) 3.01 Tj
+0 -36.6545 Td
+(4375 if\(bn >= MAXFILE\)) 14.448 Tj
+0 -37.9636 Td
+(4376 panic\("bmap 1"\);) 15.05 Tj
+0 -39.2727 Td
+(4377 if\(bn < NDIRECT\) {) 15.05 Tj
+0 -40.5818 Td
+(4378 x = ip->addrs[bn];) 16.254 Tj
+0 -41.8909 Td
+(4379 if\(x == 0\)) 11.438 Tj
+0 -43.2 Td
+(4380 panic\("bmap 2"\);) 16.254 Tj
+0 -44.5091 Td
+(4381 } else {) 9.03 Tj
+0 -45.8182 Td
+(4382 if\(ip->addrs[INDIRECT] == 0\)) 22.274 Tj
+0 -47.1272 Td
+(4383 panic\("bmap 3"\);) 16.254 Tj
+0 -48.4363 Td
+(4384 inbp = bread\(ip->dev, ip->addrs[INDIRECT]\);) 31.304 Tj
+0 -49.7454 Td
+(4385 a = \(uint*\) inbp->data;) 19.264 Tj
+0 -51.0545 Td
+(4386 x = a[bn - NDIRECT];) 17.458 Tj
+0 -52.3636 Td
+(4387 brelse\(inbp\);) 13.244 Tj
+0 -53.6727 Td
+(4388 if\(x == 0\)) 11.438 Tj
+0 -54.9818 Td
+(4389 panic\("bmap 4"\);) 16.254 Tj
+0 -56.2909 Td
+(4390 }) 4.816 Tj
+0 -57.6 Td
+(4391 return x;) 9.632 Tj
+0 -58.9091 Td
+(4392 }) 3.612 Tj
+0 -60.2181 Td
+(4393 ) 3.01 Tj
+0 -61.5272 Td
+(4394 ) 3.01 Tj
+0 -62.8363 Td
+(4395 ) 3.01 Tj
+0 -64.1454 Td
+(4396 ) 3.01 Tj
+0 -65.4545 Td
+(4397 ) 3.01 Tj
+0 -66.7636 Td
+(4398 ) 3.01 Tj
+0 -68.0727 Td
+(4399 ) 3.01 Tj
+0 -72 Td
+(Sheet 43) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 51 51
+%%BeginPageSetup
+%%PageOrientation: Landscape
+pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/fs.c Page 8) 21.07 Tj
+0 -3.92728 Td
+(4400 // Truncate the inode ip, discarding all its data blocks.) 37.324 Tj
+0 -5.23637 Td
+(4401 void) 5.418 Tj
+0 -6.54546 Td
+(4402 itrunc\(struct inode *ip\)) 17.458 Tj
+0 -7.85455 Td
+(4403 {) 3.612 Tj
+0 -9.16364 Td
+(4404 int i, j;) 9.632 Tj
+0 -10.4727 Td
+(4405 struct buf *inbp;) 14.448 Tj
+0 -11.7818 Td
+(4406 ) 3.01 Tj
+0 -13.0909 Td
+(4407 for\(i = 0; i < NADDRS; i++\) {) 21.672 Tj
+0 -14.4 Td
+(4408 if\(ip->addrs[i] != 0\) {) 19.264 Tj
+0 -15.7091 Td
+(4409 if\(i == INDIRECT\) {) 18.06 Tj
+0 -17.0182 Td
+(4410 inbp = bread\(ip->dev, ip->addrs[INDIRECT]\);) 33.712 Tj
+0 -18.3273 Td
+(4411 uint *a = \(uint*\) inbp->data;) 25.284 Tj
+0 -19.6364 Td
+(4412 for\(j = 0; j < NINDIRECT; j++\) {) 27.09 Tj
+0 -20.9455 Td
+(4413 if\(a[j] != 0\) {) 18.06 Tj
+0 -22.2545 Td
+(4414 bfree\(ip->dev, a[j]\);) 22.876 Tj
+0 -23.5636 Td
+(4415 a[j] = 0;) 15.652 Tj
+0 -24.8727 Td
+(4416 }) 9.632 Tj
+0 -26.1818 Td
+(4417 }) 8.428 Tj
+0 -27.4909 Td
+(4418 brelse\(inbp\);) 15.652 Tj
+0 -28.8 Td
+(4419 }) 7.224 Tj
+0 -30.1091 Td
+(4420 bfree\(ip->dev, ip->addrs[i]\);) 24.08 Tj
+0 -31.4182 Td
+(4421 ip->addrs[i] = 0;) 16.856 Tj
+0 -32.7273 Td
+(4422 }) 6.02 Tj
+0 -34.0364 Td
+(4423 }) 4.816 Tj
+0 -35.3454 Td
+(4424 ip->size = 0;) 12.04 Tj
+0 -36.6545 Td
+(4425 iupdate\(ip\);) 11.438 Tj
+0 -37.9636 Td
+(4426 }) 3.612 Tj
+0 -39.2727 Td
+(4427 ) 3.01 Tj
+0 -40.5818 Td
+(4428 // Caller holds reference to ip and has locked it,) 33.11 Tj
+0 -41.8909 Td
+(4429 // possibly editing it.) 16.856 Tj
+0 -43.2 Td
+(4430 // Release lock and drop the reference.) 26.488 Tj
+0 -44.5091 Td
+(4431 void) 5.418 Tj
+0 -45.8182 Td
+(4432 iput\(struct inode *ip\)) 16.254 Tj
+0 -47.1272 Td
+(4433 {) 3.612 Tj
+0 -48.4363 Td
+(4434 if\(ip->ref < 1 || ip->busy != 1\)) 23.478 Tj
+0 -49.7454 Td
+(4435 panic\("iput"\);) 13.846 Tj
+0 -51.0545 Td
+(4436 ) 3.01 Tj
+0 -52.3636 Td
+(4437 if\(\(ip->ref == 1\) && \(ip->nlink == 0\)\) {) 28.294 Tj
+0 -53.6727 Td
+(4438 itrunc\(ip\);) 12.04 Tj
+0 -54.9818 Td
+(4439 ifree\(ip\);) 11.438 Tj
+0 -56.2909 Td
+(4440 }) 4.816 Tj
+0 -57.6 Td
+(4441 ) 3.01 Tj
+0 -58.9091 Td
+(4442 acquire\(&inode_table_lock\);) 20.468 Tj
+0 -60.2181 Td
+(4443 ) 3.01 Tj
+0 -61.5272 Td
+(4444 ip->ref -= 1;) 12.04 Tj
+0 -62.8363 Td
+(4445 ip->busy = 0;) 12.04 Tj
+0 -64.1454 Td
+(4446 wakeup\(ip\);) 10.836 Tj
+0 -65.4545 Td
+(4447 ) 3.01 Tj
+0 -66.7636 Td
+(4448 release\(&inode_table_lock\);) 20.468 Tj
+0 -68.0727 Td
+(4449 }) 3.612 Tj
+0 -72 Td
+(Sheet 44) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/fs.c Page 9) 21.07 Tj
+0 -3.92728 Td
+(4450 // Caller holds reference to ip but not lock.) 30.1 Tj
+0 -5.23637 Td
+(4451 // Drop reference.) 13.846 Tj
+0 -6.54546 Td
+(4452 void) 5.418 Tj
+0 -7.85455 Td
+(4453 idecref\(struct inode *ip\)) 18.06 Tj
+0 -9.16364 Td
+(4454 {) 3.612 Tj
+0 -10.4727 Td
+(4455 ilock\(ip\);) 10.234 Tj
+0 -11.7818 Td
+(4456 iput\(ip\);) 9.632 Tj
+0 -13.0909 Td
+(4457 }) 3.612 Tj
+0 -14.4 Td
+(4458 ) 3.01 Tj
+0 -15.7091 Td
+(4459 // Increment reference count for ip.) 24.682 Tj
+0 -17.0182 Td
+(4460 void) 5.418 Tj
+0 -18.3273 Td
+(4461 iincref\(struct inode *ip\)) 18.06 Tj
+0 -19.6364 Td
+(4462 {) 3.612 Tj
+0 -20.9455 Td
+(4463 ilock\(ip\);) 10.234 Tj
+0 -22.2545 Td
+(4464 ip->ref++;) 10.234 Tj
+0 -23.5636 Td
+(4465 iunlock\(ip\);) 11.438 Tj
+0 -24.8727 Td
+(4466 }) 3.612 Tj
+0 -26.1818 Td
+(4467 ) 3.01 Tj
+0 -27.4909 Td
+(4468 // Copy stat information from inode.) 24.682 Tj
+0 -28.8 Td
+(4469 void) 5.418 Tj
+0 -30.1091 Td
+(4470 stati\(struct inode *ip, struct stat *st\)) 27.09 Tj
+0 -31.4182 Td
+(4471 {) 3.612 Tj
+0 -32.7273 Td
+(4472 st->dev = ip->dev;) 15.05 Tj
+0 -34.0364 Td
+(4473 st->ino = ip->inum;) 15.652 Tj
+0 -35.3454 Td
+(4474 st->type = ip->type;) 16.254 Tj
+0 -36.6545 Td
+(4475 st->nlink = ip->nlink;) 17.458 Tj
+0 -37.9636 Td
+(4476 st->size = ip->size;) 16.254 Tj
+0 -39.2727 Td
+(4477 }) 3.612 Tj
+0 -40.5818 Td
+(4478 ) 3.01 Tj
+0 -41.8909 Td
+(4479 #define min\(a, b\) \(\(a\) < \(b\) ? \(a\) : \(b\)\)) 27.692 Tj
+0 -43.2 Td
+(4480 ) 3.01 Tj
+0 -44.5091 Td
+(4481 // Read data from inode.) 17.458 Tj
+0 -45.8182 Td
+(4482 int) 4.816 Tj
+0 -47.1272 Td
+(4483 readi\(struct inode *ip, char *dst, uint off, uint n\)) 34.314 Tj
+0 -48.4363 Td
+(4484 {) 3.612 Tj
+0 -49.7454 Td
+(4485 uint target = n, n1;) 16.254 Tj
+0 -51.0545 Td
+(4486 struct buf *bp;) 13.244 Tj
+0 -52.3636 Td
+(4487 ) 3.01 Tj
+0 -53.6727 Td
+(4488 if\(ip->type == T_DEV\) {) 18.06 Tj
+0 -54.9818 Td
+(4489 if\(ip->major < 0 || ip->major >= NDEV || !devsw[ip->major].read\)) 43.946 Tj
+0 -56.2909 Td
+(4490 return -1;) 12.642 Tj
+0 -57.6 Td
+(4491 return devsw[ip->major].read\(ip->minor, dst, n\);) 34.314 Tj
+0 -58.9091 Td
+(4492 }) 4.816 Tj
+0 -60.2181 Td
+(4493 ) 3.01 Tj
+0 -61.5272 Td
+(4494 while\(n > 0 && off < ip->size\){) 22.876 Tj
+0 -62.8363 Td
+(4495 bp = bread\(ip->dev, bmap\(ip, off / BSIZE\)\);) 31.304 Tj
+0 -64.1454 Td
+(4496 n1 = min\(n, ip->size - off\);) 22.274 Tj
+0 -65.4545 Td
+(4497 n1 = min\(n1, BSIZE - \(off % BSIZE\)\);) 27.09 Tj
+0 -66.7636 Td
+(4498 memmove\(dst, bp->data + \(off % BSIZE\), n1\);) 31.304 Tj
+0 -68.0727 Td
+(4499 n -= n1;) 10.234 Tj
+0 -72 Td
+(Sheet 44) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 52 52
+%%BeginPageSetup
+%%PageOrientation: Landscape
+__tumble pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/fs.c Page 10) 21.672 Tj
+0 -3.92728 Td
+(4500 off += n1;) 11.438 Tj
+0 -5.23637 Td
+(4501 dst += n1;) 11.438 Tj
+0 -6.54546 Td
+(4502 brelse\(bp\);) 12.04 Tj
+0 -7.85455 Td
+(4503 }) 4.816 Tj
+0 -9.16364 Td
+(4504 ) 3.01 Tj
+0 -10.4727 Td
+(4505 return target - n;) 15.05 Tj
+0 -11.7818 Td
+(4506 }) 3.612 Tj
+0 -13.0909 Td
+(4507 ) 3.01 Tj
+0 -14.4 Td
+(4508 // Allocate the nth block in inode ip if necessary.) 33.712 Tj
+0 -15.7091 Td
+(4509 static int) 9.03 Tj
+0 -17.0182 Td
+(4510 newblock\(struct inode *ip, uint lbn\)) 24.682 Tj
+0 -18.3273 Td
+(4511 {) 3.612 Tj
+0 -19.6364 Td
+(4512 struct buf *inbp;) 14.448 Tj
+0 -20.9455 Td
+(4513 uint *inaddrs;) 12.642 Tj
+0 -22.2545 Td
+(4514 uint b;) 8.428 Tj
+0 -23.5636 Td
+(4515 ) 3.01 Tj
+0 -24.8727 Td
+(4516 if\(lbn < NDIRECT\) {) 15.652 Tj
+0 -26.1818 Td
+(4517 if\(ip->addrs[lbn] == 0\) {) 20.468 Tj
+0 -27.4909 Td
+(4518 b = balloc\(ip->dev\);) 18.662 Tj
+0 -28.8 Td
+(4519 if\(b <= 0\)) 12.642 Tj
+0 -30.1091 Td
+(4520 return -1;) 13.846 Tj
+0 -31.4182 Td
+(4521 ip->addrs[lbn] = b;) 18.06 Tj
+0 -32.7273 Td
+(4522 }) 6.02 Tj
+0 -34.0364 Td
+(4523 } else {) 9.03 Tj
+0 -35.3454 Td
+(4524 if\(ip->addrs[INDIRECT] == 0\) {) 23.478 Tj
+0 -36.6545 Td
+(4525 b = balloc\(ip->dev\);) 18.662 Tj
+0 -37.9636 Td
+(4526 if\(b <= 0\)) 12.642 Tj
+0 -39.2727 Td
+(4527 return -1;) 13.846 Tj
+0 -40.5818 Td
+(4528 ip->addrs[INDIRECT] = b;) 21.07 Tj
+0 -41.8909 Td
+(4529 }) 6.02 Tj
+0 -43.2 Td
+(4530 inbp = bread\(ip->dev, ip->addrs[INDIRECT]\);) 31.304 Tj
+0 -44.5091 Td
+(4531 inaddrs = \(uint*\) inbp->data;) 22.876 Tj
+0 -45.8182 Td
+(4532 if\(inaddrs[lbn - NDIRECT] == 0\) {) 25.284 Tj
+0 -47.1272 Td
+(4533 b = balloc\(ip->dev\);) 18.662 Tj
+0 -48.4363 Td
+(4534 if\(b <= 0\)) 12.642 Tj
+0 -49.7454 Td
+(4535 return -1;) 13.846 Tj
+0 -51.0545 Td
+(4536 inaddrs[lbn - NDIRECT] = b;) 22.876 Tj
+0 -52.3636 Td
+(4537 bwrite\(inbp, ip->addrs[INDIRECT]\);) 27.09 Tj
+0 -53.6727 Td
+(4538 }) 6.02 Tj
+0 -54.9818 Td
+(4539 brelse\(inbp\);) 13.244 Tj
+0 -56.2909 Td
+(4540 }) 4.816 Tj
+0 -57.6 Td
+(4541 return 0;) 9.632 Tj
+0 -58.9091 Td
+(4542 }) 3.612 Tj
+0 -60.2181 Td
+(4543 ) 3.01 Tj
+0 -61.5272 Td
+(4544 ) 3.01 Tj
+0 -62.8363 Td
+(4545 ) 3.01 Tj
+0 -64.1454 Td
+(4546 ) 3.01 Tj
+0 -65.4545 Td
+(4547 ) 3.01 Tj
+0 -66.7636 Td
+(4548 ) 3.01 Tj
+0 -68.0727 Td
+(4549 ) 3.01 Tj
+0 -72 Td
+(Sheet 45) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/fs.c Page 11) 21.672 Tj
+0 -3.92728 Td
+(4550 // Write data to inode.) 16.856 Tj
+0 -5.23637 Td
+(4551 int) 4.816 Tj
+0 -6.54546 Td
+(4552 writei\(struct inode *ip, char *addr, uint off, uint n\)) 35.518 Tj
+0 -7.85455 Td
+(4553 {) 3.612 Tj
+0 -9.16364 Td
+(4554 if\(ip->type == T_DEV\) {) 18.06 Tj
+0 -10.4727 Td
+(4555 if\(ip->major < 0 || ip->major >= NDEV || !devsw[ip->major].write\)) 44.548 Tj
+0 -11.7818 Td
+(4556 return -1;) 12.642 Tj
+0 -13.0909 Td
+(4557 return devsw[ip->major].write\(ip->minor, addr, n\);) 35.518 Tj
+0 -14.4 Td
+(4558 } else if\(ip->type == T_FILE || ip->type == T_DIR\) {) 35.518 Tj
+0 -15.7091 Td
+(4559 struct buf *bp;) 14.448 Tj
+0 -17.0182 Td
+(4560 int r = 0;) 11.438 Tj
+0 -18.3273 Td
+(4561 int m;) 9.03 Tj
+0 -19.6364 Td
+(4562 int lbn;) 10.234 Tj
+0 -20.9455 Td
+(4563 while\(r < n\) {) 13.846 Tj
+0 -22.2545 Td
+(4564 lbn = off / BSIZE;) 17.458 Tj
+0 -23.5636 Td
+(4565 if\(lbn >= MAXFILE\)) 17.458 Tj
+0 -24.8727 Td
+(4566 return r;) 13.244 Tj
+0 -26.1818 Td
+(4567 if\(newblock\(ip, lbn\) < 0\) {) 22.876 Tj
+0 -27.4909 Td
+(4568 cprintf\("newblock failed\\n"\);) 25.284 Tj
+0 -28.8 Td
+(4569 return r;) 13.244 Tj
+0 -30.1091 Td
+(4570 }) 7.224 Tj
+0 -31.4182 Td
+(4571 m = min\(BSIZE - off % BSIZE, n-r\);) 27.09 Tj
+0 -32.7273 Td
+(4572 bp = bread\(ip->dev, bmap\(ip, lbn\)\);) 27.692 Tj
+0 -34.0364 Td
+(4573 memmove\(bp->data + off % BSIZE, addr, m\);) 31.304 Tj
+0 -35.3454 Td
+(4574 bwrite\(bp, bmap\(ip, lbn\)\);) 22.274 Tj
+0 -36.6545 Td
+(4575 brelse\(bp\);) 13.244 Tj
+0 -37.9636 Td
+(4576 r += m;) 10.836 Tj
+0 -39.2727 Td
+(4577 off += m;) 12.04 Tj
+0 -40.5818 Td
+(4578 }) 6.02 Tj
+0 -41.8909 Td
+(4579 if\(r > 0\) {) 12.04 Tj
+0 -43.2 Td
+(4580 if\(off > ip->size\) {) 18.662 Tj
+0 -44.5091 Td
+(4581 if\(ip->type == T_DIR\)) 20.468 Tj
+0 -45.8182 Td
+(4582 ip->size = \(\(off / BSIZE\) + 1\) * BSIZE;) 32.508 Tj
+0 -47.1272 Td
+(4583 else) 10.234 Tj
+0 -48.4363 Td
+(4584 ip->size = off;) 18.06 Tj
+0 -49.7454 Td
+(4585 }) 7.224 Tj
+0 -51.0545 Td
+(4586 iupdate\(ip\);) 13.846 Tj
+0 -52.3636 Td
+(4587 }) 6.02 Tj
+0 -53.6727 Td
+(4588 return r;) 10.836 Tj
+0 -54.9818 Td
+(4589 } else {) 9.03 Tj
+0 -56.2909 Td
+(4590 panic\("writei: unknown type"\);) 23.478 Tj
+0 -57.6 Td
+(4591 return 0;) 10.836 Tj
+0 -58.9091 Td
+(4592 }) 4.816 Tj
+0 -60.2181 Td
+(4593 }) 3.612 Tj
+0 -61.5272 Td
+(4594 ) 3.01 Tj
+0 -62.8363 Td
+(4595 ) 3.01 Tj
+0 -64.1454 Td
+(4596 ) 3.01 Tj
+0 -65.4545 Td
+(4597 ) 3.01 Tj
+0 -66.7636 Td
+(4598 ) 3.01 Tj
+0 -68.0727 Td
+(4599 ) 3.01 Tj
+0 -72 Td
+(Sheet 45) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 53 53
+%%BeginPageSetup
+%%PageOrientation: Landscape
+pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/fs.c Page 12) 21.672 Tj
+0 -3.92728 Td
+(4600 // look up a path name, in one of three modes.) 30.702 Tj
+0 -5.23637 Td
+(4601 // NAMEI_LOOKUP: return locked target inode.) 29.498 Tj
+0 -6.54546 Td
+(4602 // NAMEI_CREATE: return locked parent inode.) 29.498 Tj
+0 -7.85455 Td
+(4603 // return 0 if name does exist.) 22.876 Tj
+0 -9.16364 Td
+(4604 // *ret_last points to last path component \(i.e. new file name\).) 42.742 Tj
+0 -10.4727 Td
+(4605 // *ret_ip points to the the name that did exist, if it did.) 40.334 Tj
+0 -11.7818 Td
+(4606 // *ret_ip and *ret_last may be zero even if return value is zero.) 43.946 Tj
+0 -13.0909 Td
+(4607 // NAMEI_DELETE: return locked parent inode, offset of dirent in *ret_off.) 47.558 Tj
+0 -14.4 Td
+(4608 // return 0 if name doesn't exist.) 24.682 Tj
+0 -15.7091 Td
+(4609 struct inode*) 10.836 Tj
+0 -17.0182 Td
+(4610 namei\(char *path, int mode, uint *ret_off,) 28.294 Tj
+0 -18.3273 Td
+(4611 char **ret_last, struct inode **ret_ip\)) 30.1 Tj
+0 -19.6364 Td
+(4612 {) 3.612 Tj
+0 -20.9455 Td
+(4613 struct inode *dp;) 14.448 Tj
+0 -22.2545 Td
+(4614 struct proc *p = curproc[cpu\(\)];) 23.478 Tj
+0 -23.5636 Td
+(4615 char *cp = path, *cp1;) 17.458 Tj
+0 -24.8727 Td
+(4616 uint off, dev;) 12.642 Tj
+0 -26.1818 Td
+(4617 struct buf *bp;) 13.244 Tj
+0 -27.4909 Td
+(4618 struct dirent *ep;) 15.05 Tj
+0 -28.8 Td
+(4619 int i, l, atend;) 13.846 Tj
+0 -30.1091 Td
+(4620 uint ninum;) 10.836 Tj
+0 -31.4182 Td
+(4621 ) 3.01 Tj
+0 -32.7273 Td
+(4622 if\(ret_off\)) 10.836 Tj
+0 -34.0364 Td
+(4623 *ret_off = 0xffffffff;) 18.662 Tj
+0 -35.3454 Td
+(4624 if\(ret_last\)) 11.438 Tj
+0 -36.6545 Td
+(4625 *ret_last = 0;) 13.846 Tj
+0 -37.9636 Td
+(4626 if\(ret_ip\)) 10.234 Tj
+0 -39.2727 Td
+(4627 *ret_ip = 0;) 12.642 Tj
+0 -40.5818 Td
+(4628 ) 3.01 Tj
+0 -41.8909 Td
+(4629 if\(*cp == '/'\)) 12.642 Tj
+0 -43.2 Td
+(4630 dp = iget\(rootdev, 1\);) 18.662 Tj
+0 -44.5091 Td
+(4631 else {) 7.826 Tj
+0 -45.8182 Td
+(4632 dp = p->cwd;) 12.642 Tj
+0 -47.1272 Td
+(4633 iincref\(dp\);) 12.642 Tj
+0 -48.4363 Td
+(4634 ilock\(dp\);) 11.438 Tj
+0 -49.7454 Td
+(4635 }) 4.816 Tj
+0 -51.0545 Td
+(4636 ) 3.01 Tj
+0 -52.3636 Td
+(4637 for\(;;\){) 9.03 Tj
+0 -53.6727 Td
+(4638 while\(*cp == '/'\)) 15.652 Tj
+0 -54.9818 Td
+(4639 cp++;) 9.632 Tj
+0 -56.2909 Td
+(4640 ) 3.01 Tj
+0 -57.6 Td
+(4641 if\(*cp == '\\0'\){) 15.05 Tj
+0 -58.9091 Td
+(4642 if\(mode == NAMEI_LOOKUP\)) 21.07 Tj
+0 -60.2181 Td
+(4643 return dp;) 13.846 Tj
+0 -61.5272 Td
+(4644 if\(mode == NAMEI_CREATE && ret_ip\){) 27.692 Tj
+0 -62.8363 Td
+(4645 *ret_ip = dp;) 15.652 Tj
+0 -64.1454 Td
+(4646 return 0;) 13.244 Tj
+0 -65.4545 Td
+(4647 }) 7.224 Tj
+0 -66.7636 Td
+(4648 iput\(dp\);) 12.04 Tj
+0 -68.0727 Td
+(4649 return 0;) 12.04 Tj
+0 -72 Td
+(Sheet 46) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/fs.c Page 13) 21.672 Tj
+0 -3.92728 Td
+(4650 }) 6.02 Tj
+0 -5.23637 Td
+(4651 ) 3.01 Tj
+0 -6.54546 Td
+(4652 if\(dp->type != T_DIR\){) 18.662 Tj
+0 -7.85455 Td
+(4653 iput\(dp\);) 12.04 Tj
+0 -9.16364 Td
+(4654 return 0;) 12.04 Tj
+0 -10.4727 Td
+(4655 }) 6.02 Tj
+0 -11.7818 Td
+(4656 ) 3.01 Tj
+0 -13.0909 Td
+(4657 for\(i = 0; cp[i] != 0 && cp[i] != '/'; i++\)) 31.304 Tj
+0 -14.4 Td
+(4658 ;) 7.224 Tj
+0 -15.7091 Td
+(4659 l = i;) 9.03 Tj
+0 -17.0182 Td
+(4660 if\(i > DIRSIZ\)) 13.846 Tj
+0 -18.3273 Td
+(4661 l = DIRSIZ;) 13.244 Tj
+0 -19.6364 Td
+(4662 ) 3.01 Tj
+0 -20.9455 Td
+(4663 for\(off = 0; off < dp->size; off += BSIZE\){) 31.304 Tj
+0 -22.2545 Td
+(4664 bp = bread\(dp->dev, bmap\(dp, off / BSIZE\)\);) 32.508 Tj
+0 -23.5636 Td
+(4665 for\(ep = \(struct dirent*\) bp->data;) 27.692 Tj
+0 -24.8727 Td
+(4666 ep < \(struct dirent*\) \(bp->data + BSIZE\);) 33.712 Tj
+0 -26.1818 Td
+(4667 ep++\){) 12.642 Tj
+0 -27.4909 Td
+(4668 if\(ep->inum == 0\)) 18.06 Tj
+0 -28.8 Td
+(4669 continue;) 14.448 Tj
+0 -30.1091 Td
+(4670 if\(memcmp\(cp, ep->name, l\) == 0 &&) 28.294 Tj
+0 -31.4182 Td
+(4671 \(l == DIRSIZ || ep->name[l]== 0\)\){) 30.1 Tj
+0 -32.7273 Td
+(4672 // entry matches path element) 26.488 Tj
+0 -34.0364 Td
+(4673 off += \(uchar*\)ep - bp->data;) 26.488 Tj
+0 -35.3454 Td
+(4674 ninum = ep->inum;) 19.264 Tj
+0 -36.6545 Td
+(4675 brelse\(bp\);) 15.652 Tj
+0 -37.9636 Td
+(4676 cp += i;) 13.846 Tj
+0 -39.2727 Td
+(4677 goto found;) 15.652 Tj
+0 -40.5818 Td
+(4678 }) 8.428 Tj
+0 -41.8909 Td
+(4679 }) 7.224 Tj
+0 -43.2 Td
+(4680 brelse\(bp\);) 13.244 Tj
+0 -44.5091 Td
+(4681 }) 6.02 Tj
+0 -45.8182 Td
+(4682 atend = 1;) 11.438 Tj
+0 -47.1272 Td
+(4683 for\(cp1 = cp; *cp1; cp1++\)) 21.07 Tj
+0 -48.4363 Td
+(4684 if\(*cp1 == '/'\)) 15.652 Tj
+0 -49.7454 Td
+(4685 atend = 0;) 13.846 Tj
+0 -51.0545 Td
+(4686 if\(mode == NAMEI_CREATE && atend\){) 25.886 Tj
+0 -52.3636 Td
+(4687 if\(*cp == '\\0'\){) 16.254 Tj
+0 -53.6727 Td
+(4688 iput\(dp\);) 13.244 Tj
+0 -54.9818 Td
+(4689 return 0;) 13.244 Tj
+0 -56.2909 Td
+(4690 }) 7.224 Tj
+0 -57.6 Td
+(4691 *ret_last = cp;) 15.652 Tj
+0 -58.9091 Td
+(4692 return dp;) 12.642 Tj
+0 -60.2181 Td
+(4693 }) 6.02 Tj
+0 -61.5272 Td
+(4694 ) 3.01 Tj
+0 -62.8363 Td
+(4695 iput\(dp\);) 10.836 Tj
+0 -64.1454 Td
+(4696 return 0;) 10.836 Tj
+0 -65.4545 Td
+(4697 ) 3.01 Tj
+0 -66.7636 Td
+(4698 ) 3.01 Tj
+0 -68.0727 Td
+(4699 ) 3.01 Tj
+0 -72 Td
+(Sheet 46) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 54 54
+%%BeginPageSetup
+%%PageOrientation: Landscape
+__tumble pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/fs.c Page 14) 21.672 Tj
+0 -3.92728 Td
+(4700 found:) 7.826 Tj
+0 -5.23637 Td
+(4701 if\(mode == NAMEI_DELETE && *cp == '\\0'\){) 29.498 Tj
+0 -6.54546 Td
+(4702 *ret_off = off;) 15.652 Tj
+0 -7.85455 Td
+(4703 return dp;) 12.642 Tj
+0 -9.16364 Td
+(4704 }) 6.02 Tj
+0 -10.4727 Td
+(4705 dev = dp->dev;) 13.846 Tj
+0 -11.7818 Td
+(4706 iput\(dp\);) 10.836 Tj
+0 -13.0909 Td
+(4707 dp = iget\(dev, ninum\);) 18.662 Tj
+0 -14.4 Td
+(4708 if\(dp->type == 0 || dp->nlink < 1\)) 25.886 Tj
+0 -15.7091 Td
+(4709 panic\("namei"\);) 15.652 Tj
+0 -17.0182 Td
+(4710 }) 4.816 Tj
+0 -18.3273 Td
+(4711 }) 3.612 Tj
+0 -19.6364 Td
+(4712 ) 3.01 Tj
+0 -20.9455 Td
+(4713 // Write a new directory entry \(name, ino\) into the directory dp.) 42.14 Tj
+0 -22.2545 Td
+(4714 // Caller must have locked dp.) 21.07 Tj
+0 -23.5636 Td
+(4715 void) 5.418 Tj
+0 -24.8727 Td
+(4716 wdir\(struct inode *dp, char *name, uint ino\)) 29.498 Tj
+0 -26.1818 Td
+(4717 {) 3.612 Tj
+0 -27.4909 Td
+(4718 uint off;) 9.632 Tj
+0 -28.8 Td
+(4719 struct dirent de;) 14.448 Tj
+0 -30.1091 Td
+(4720 int i;) 7.826 Tj
+0 -31.4182 Td
+(4721 ) 3.01 Tj
+0 -32.7273 Td
+(4722 for\(off = 0; off < dp->size; off += sizeof\(de\)\){) 33.11 Tj
+0 -34.0364 Td
+(4723 if\(readi\(dp, \(char*\) &de, off, sizeof\(de\)\) != sizeof\(de\)\)) 39.732 Tj
+0 -35.3454 Td
+(4724 panic\("wdir read"\);) 18.06 Tj
+0 -36.6545 Td
+(4725 if\(de.inum == 0\)) 15.05 Tj
+0 -37.9636 Td
+(4726 break;) 10.234 Tj
+0 -39.2727 Td
+(4727 }) 4.816 Tj
+0 -40.5818 Td
+(4728 ) 3.01 Tj
+0 -41.8909 Td
+(4729 de.inum = ino;) 12.642 Tj
+0 -43.2 Td
+(4730 for\(i = 0; i < DIRSIZ && name[i]; i++\)) 27.09 Tj
+0 -44.5091 Td
+(4731 de.name[i] = name[i];) 18.06 Tj
+0 -45.8182 Td
+(4732 for\( ; i < DIRSIZ; i++\)) 18.06 Tj
+0 -47.1272 Td
+(4733 de.name[i] = '\\0';) 16.254 Tj
+0 -48.4363 Td
+(4734 ) 3.01 Tj
+0 -49.7454 Td
+(4735 if\(writei\(dp, \(char*\) &de, off, sizeof\(de\)\) != sizeof\(de\)\)) 39.13 Tj
+0 -51.0545 Td
+(4736 panic\("wdir write"\);) 17.458 Tj
+0 -52.3636 Td
+(4737 }) 3.612 Tj
+0 -53.6727 Td
+(4738 ) 3.01 Tj
+0 -54.9818 Td
+(4739 ) 3.01 Tj
+0 -56.2909 Td
+(4740 ) 3.01 Tj
+0 -57.6 Td
+(4741 ) 3.01 Tj
+0 -58.9091 Td
+(4742 ) 3.01 Tj
+0 -60.2181 Td
+(4743 ) 3.01 Tj
+0 -61.5272 Td
+(4744 ) 3.01 Tj
+0 -62.8363 Td
+(4745 ) 3.01 Tj
+0 -64.1454 Td
+(4746 ) 3.01 Tj
+0 -65.4545 Td
+(4747 ) 3.01 Tj
+0 -66.7636 Td
+(4748 ) 3.01 Tj
+0 -68.0727 Td
+(4749 ) 3.01 Tj
+0 -72 Td
+(Sheet 47) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/fs.c Page 15) 21.672 Tj
+0 -3.92728 Td
+(4750 // Create the path cp and return its locked inode structure.) 39.13 Tj
+0 -5.23637 Td
+(4751 // If cp already exists, return 0.) 23.478 Tj
+0 -6.54546 Td
+(4752 struct inode*) 10.836 Tj
+0 -7.85455 Td
+(4753 mknod\(char *cp, short type, short major, short minor\)) 34.916 Tj
+0 -9.16364 Td
+(4754 {) 3.612 Tj
+0 -10.4727 Td
+(4755 struct inode *ip, *dp;) 17.458 Tj
+0 -11.7818 Td
+(4756 char *last;) 10.836 Tj
+0 -13.0909 Td
+(4757 ) 3.01 Tj
+0 -14.4 Td
+(4758 if\(\(dp = namei\(cp, NAMEI_CREATE, 0, &last, 0\)\) == 0\)) 35.518 Tj
+0 -15.7091 Td
+(4759 return 0;) 10.836 Tj
+0 -17.0182 Td
+(4760 ) 3.01 Tj
+0 -18.3273 Td
+(4761 ip = mknod1\(dp, last, type, major, minor\);) 29.498 Tj
+0 -19.6364 Td
+(4762 ) 3.01 Tj
+0 -20.9455 Td
+(4763 iput\(dp\);) 9.632 Tj
+0 -22.2545 Td
+(4764 ) 3.01 Tj
+0 -23.5636 Td
+(4765 return ip;) 10.234 Tj
+0 -24.8727 Td
+(4766 }) 3.612 Tj
+0 -26.1818 Td
+(4767 ) 3.01 Tj
+0 -27.4909 Td
+(4768 // Create a new inode named name inside dp) 28.294 Tj
+0 -28.8 Td
+(4769 // and return its locked inode structure.) 27.692 Tj
+0 -30.1091 Td
+(4770 // If name already exists, return 0.) 24.682 Tj
+0 -31.4182 Td
+(4771 struct inode*) 10.836 Tj
+0 -32.7273 Td
+(4772 mknod1\(struct inode *dp, char *name, short type, short major, short minor\)) 47.558 Tj
+0 -34.0364 Td
+(4773 {) 3.612 Tj
+0 -35.3454 Td
+(4774 struct inode *ip;) 14.448 Tj
+0 -36.6545 Td
+(4775 ) 3.01 Tj
+0 -37.9636 Td
+(4776 ip = ialloc\(dp->dev, type\);) 20.468 Tj
+0 -39.2727 Td
+(4777 if\(ip == 0\)) 10.836 Tj
+0 -40.5818 Td
+(4778 return 0;) 10.836 Tj
+0 -41.8909 Td
+(4779 ip->major = major;) 15.05 Tj
+0 -43.2 Td
+(4780 ip->minor = minor;) 15.05 Tj
+0 -44.5091 Td
+(4781 ip->size = 0;) 12.04 Tj
+0 -45.8182 Td
+(4782 ip->nlink = 1;) 12.642 Tj
+0 -47.1272 Td
+(4783 ) 3.01 Tj
+0 -48.4363 Td
+(4784 iupdate\(ip\); // write new inode to disk) 28.294 Tj
+0 -49.7454 Td
+(4785 ) 3.01 Tj
+0 -51.0545 Td
+(4786 wdir\(dp, name, ip->inum\);) 19.264 Tj
+0 -52.3636 Td
+(4787 ) 3.01 Tj
+0 -53.6727 Td
+(4788 return ip;) 10.234 Tj
+0 -54.9818 Td
+(4789 }) 3.612 Tj
+0 -56.2909 Td
+(4790 ) 3.01 Tj
+0 -57.6 Td
+(4791 ) 3.01 Tj
+0 -58.9091 Td
+(4792 ) 3.01 Tj
+0 -60.2181 Td
+(4793 ) 3.01 Tj
+0 -61.5272 Td
+(4794 ) 3.01 Tj
+0 -62.8363 Td
+(4795 ) 3.01 Tj
+0 -64.1454 Td
+(4796 ) 3.01 Tj
+0 -65.4545 Td
+(4797 ) 3.01 Tj
+0 -66.7636 Td
+(4798 ) 3.01 Tj
+0 -68.0727 Td
+(4799 ) 3.01 Tj
+0 -72 Td
+(Sheet 47) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 55 55
+%%BeginPageSetup
+%%PageOrientation: Landscape
+pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/fs.c Page 16) 21.672 Tj
+0 -3.92728 Td
+(4800 // Unlink the inode named cp.) 20.468 Tj
+0 -5.23637 Td
+(4801 int) 4.816 Tj
+0 -6.54546 Td
+(4802 unlink\(char *cp\)) 12.642 Tj
+0 -7.85455 Td
+(4803 {) 3.612 Tj
+0 -9.16364 Td
+(4804 struct inode *ip, *dp;) 17.458 Tj
+0 -10.4727 Td
+(4805 struct dirent de;) 14.448 Tj
+0 -11.7818 Td
+(4806 uint off, inum, dev;) 16.254 Tj
+0 -13.0909 Td
+(4807 ) 3.01 Tj
+0 -14.4 Td
+(4808 dp = namei\(cp, NAMEI_DELETE, &off, 0, 0\);) 28.896 Tj
+0 -15.7091 Td
+(4809 if\(dp == 0\)) 10.836 Tj
+0 -17.0182 Td
+(4810 return -1;) 11.438 Tj
+0 -18.3273 Td
+(4811 ) 3.01 Tj
+0 -19.6364 Td
+(4812 dev = dp->dev;) 12.642 Tj
+0 -20.9455 Td
+(4813 ) 3.01 Tj
+0 -22.2545 Td
+(4814 if\(readi\(dp, \(char*\)&de, off, sizeof\(de\)\) != sizeof\(de\) || de.inum == 0\)) 47.558 Tj
+0 -23.5636 Td
+(4815 panic\("unlink no entry"\);) 20.468 Tj
+0 -24.8727 Td
+(4816 ) 3.01 Tj
+0 -26.1818 Td
+(4817 inum = de.inum;) 13.244 Tj
+0 -27.4909 Td
+(4818 ) 3.01 Tj
+0 -28.8 Td
+(4819 memset\(&de, 0, sizeof\(de\)\);) 20.468 Tj
+0 -30.1091 Td
+(4820 if\(writei\(dp, \(char*\)&de, off, sizeof\(de\)\) != sizeof\(de\)\)) 38.528 Tj
+0 -31.4182 Td
+(4821 panic\("unlink dir write"\);) 21.07 Tj
+0 -32.7273 Td
+(4822 ) 3.01 Tj
+0 -34.0364 Td
+(4823 iupdate\(dp\);) 11.438 Tj
+0 -35.3454 Td
+(4824 iput\(dp\);) 9.632 Tj
+0 -36.6545 Td
+(4825 ) 3.01 Tj
+0 -37.9636 Td
+(4826 ip = iget\(dev, inum\);) 16.856 Tj
+0 -39.2727 Td
+(4827 ) 3.01 Tj
+0 -40.5818 Td
+(4828 if\(ip->nlink < 1\)) 14.448 Tj
+0 -41.8909 Td
+(4829 panic\("unlink nlink < 1"\);) 21.07 Tj
+0 -43.2 Td
+(4830 ) 3.01 Tj
+0 -44.5091 Td
+(4831 ip->nlink--;) 11.438 Tj
+0 -45.8182 Td
+(4832 ) 3.01 Tj
+0 -47.1272 Td
+(4833 iupdate\(ip\);) 11.438 Tj
+0 -48.4363 Td
+(4834 iput\(ip\);) 9.632 Tj
+0 -49.7454 Td
+(4835 ) 3.01 Tj
+0 -51.0545 Td
+(4836 return 0;) 9.632 Tj
+0 -52.3636 Td
+(4837 }) 3.612 Tj
+0 -53.6727 Td
+(4838 ) 3.01 Tj
+0 -54.9818 Td
+(4839 ) 3.01 Tj
+0 -56.2909 Td
+(4840 ) 3.01 Tj
+0 -57.6 Td
+(4841 ) 3.01 Tj
+0 -58.9091 Td
+(4842 ) 3.01 Tj
+0 -60.2181 Td
+(4843 ) 3.01 Tj
+0 -61.5272 Td
+(4844 ) 3.01 Tj
+0 -62.8363 Td
+(4845 ) 3.01 Tj
+0 -64.1454 Td
+(4846 ) 3.01 Tj
+0 -65.4545 Td
+(4847 ) 3.01 Tj
+0 -66.7636 Td
+(4848 ) 3.01 Tj
+0 -68.0727 Td
+(4849 ) 3.01 Tj
+0 -72 Td
+(Sheet 48) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/fs.c Page 17) 21.672 Tj
+0 -3.92728 Td
+(4850 // Create the path new as a link to the same inode as old.) 37.926 Tj
+0 -5.23637 Td
+(4851 int) 4.816 Tj
+0 -6.54546 Td
+(4852 link\(char *name1, char *name2\)) 21.07 Tj
+0 -7.85455 Td
+(4853 {) 3.612 Tj
+0 -9.16364 Td
+(4854 struct inode *ip, *dp;) 17.458 Tj
+0 -10.4727 Td
+(4855 char *last;) 10.836 Tj
+0 -11.7818 Td
+(4856 ) 3.01 Tj
+0 -13.0909 Td
+(4857 if\(\(ip = namei\(name1, NAMEI_LOOKUP, 0, 0, 0\)\) == 0\)) 34.916 Tj
+0 -14.4 Td
+(4858 return -1;) 11.438 Tj
+0 -15.7091 Td
+(4859 if\(ip->type == T_DIR\){) 17.458 Tj
+0 -17.0182 Td
+(4860 iput\(ip\);) 10.836 Tj
+0 -18.3273 Td
+(4861 return -1;) 11.438 Tj
+0 -19.6364 Td
+(4862 }) 4.816 Tj
+0 -20.9455 Td
+(4863 ) 3.01 Tj
+0 -22.2545 Td
+(4864 iunlock\(ip\);) 11.438 Tj
+0 -23.5636 Td
+(4865 ) 3.01 Tj
+0 -24.8727 Td
+(4866 if\(\(dp = namei\(name2, NAMEI_CREATE, 0, &last, 0\)\) == 0\) {) 38.528 Tj
+0 -26.1818 Td
+(4867 idecref\(ip\);) 12.642 Tj
+0 -27.4909 Td
+(4868 return -1;) 11.438 Tj
+0 -28.8 Td
+(4869 }) 4.816 Tj
+0 -30.1091 Td
+(4870 if\(dp->dev != ip->dev\){) 18.06 Tj
+0 -31.4182 Td
+(4871 idecref\(ip\);) 12.642 Tj
+0 -32.7273 Td
+(4872 iput\(dp\);) 10.836 Tj
+0 -34.0364 Td
+(4873 return -1;) 11.438 Tj
+0 -35.3454 Td
+(4874 }) 4.816 Tj
+0 -36.6545 Td
+(4875 ) 3.01 Tj
+0 -37.9636 Td
+(4876 ilock\(ip\);) 10.234 Tj
+0 -39.2727 Td
+(4877 ip->nlink++;) 11.438 Tj
+0 -40.5818 Td
+(4878 iupdate\(ip\);) 11.438 Tj
+0 -41.8909 Td
+(4879 ) 3.01 Tj
+0 -43.2 Td
+(4880 wdir\(dp, last, ip->inum\);) 19.264 Tj
+0 -44.5091 Td
+(4881 iput\(dp\);) 9.632 Tj
+0 -45.8182 Td
+(4882 iput\(ip\);) 9.632 Tj
+0 -47.1272 Td
+(4883 ) 3.01 Tj
+0 -48.4363 Td
+(4884 return 0;) 9.632 Tj
+0 -49.7454 Td
+(4885 }) 3.612 Tj
+0 -51.0545 Td
+(4886 ) 3.01 Tj
+0 -52.3636 Td
+(4887 ) 3.01 Tj
+0 -53.6727 Td
+(4888 ) 3.01 Tj
+0 -54.9818 Td
+(4889 ) 3.01 Tj
+0 -56.2909 Td
+(4890 ) 3.01 Tj
+0 -57.6 Td
+(4891 ) 3.01 Tj
+0 -58.9091 Td
+(4892 ) 3.01 Tj
+0 -60.2181 Td
+(4893 ) 3.01 Tj
+0 -61.5272 Td
+(4894 ) 3.01 Tj
+0 -62.8363 Td
+(4895 ) 3.01 Tj
+0 -64.1454 Td
+(4896 ) 3.01 Tj
+0 -65.4545 Td
+(4897 ) 3.01 Tj
+0 -66.7636 Td
+(4898 ) 3.01 Tj
+0 -68.0727 Td
+(4899 ) 3.01 Tj
+0 -72 Td
+(Sheet 48) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 56 56
+%%BeginPageSetup
+%%PageOrientation: Landscape
+__tumble pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/file.c Page 1) 22.274 Tj
+0 -3.92728 Td
+(4900 #include "types.h") 13.846 Tj
+0 -5.23637 Td
+(4901 #include "stat.h") 13.244 Tj
+0 -6.54546 Td
+(4902 #include "param.h") 13.846 Tj
+0 -7.85455 Td
+(4903 #include "x86.h") 12.642 Tj
+0 -9.16364 Td
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+(4905 #include "proc.h") 13.244 Tj
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+(4906 #include "defs.h") 13.244 Tj
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+(4907 #include "file.h") 13.244 Tj
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+(4908 #include "spinlock.h") 15.652 Tj
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+(4917 ) 3.01 Tj
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+0 -28.8 Td
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+0 -30.1091 Td
+(4920 {) 3.612 Tj
+0 -31.4182 Td
+(4921 initlock\(&file_table_lock, "file_table"\);) 28.896 Tj
+0 -32.7273 Td
+(4922 }) 3.612 Tj
+0 -34.0364 Td
+(4923 ) 3.01 Tj
+0 -35.3454 Td
+(4924 // Allocate a file structure) 19.866 Tj
+0 -36.6545 Td
+(4925 struct file*) 10.234 Tj
+0 -37.9636 Td
+(4926 filealloc\(void\)) 12.04 Tj
+0 -39.2727 Td
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+(4928 int i;) 7.826 Tj
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+0 -48.4363 Td
+(4934 file[i].ref = 1;) 16.254 Tj
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+(4935 release\(&file_table_lock\);) 22.274 Tj
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+(4936 return file + i;) 16.254 Tj
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+(4937 }) 6.02 Tj
+0 -53.6727 Td
+(4938 }) 4.816 Tj
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+(4939 release\(&file_table_lock\);) 19.866 Tj
+0 -56.2909 Td
+(4940 return 0;) 9.632 Tj
+0 -57.6 Td
+(4941 }) 3.612 Tj
+0 -58.9091 Td
+(4942 ) 3.01 Tj
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+(4943 ) 3.01 Tj
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+(4944 ) 3.01 Tj
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+(4957 return pipe_write\(f->pipe, addr, n\);) 27.09 Tj
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+(4958 } else if\(f->type == FD_FILE\) {) 22.876 Tj
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+(4959 ilock\(f->ip\);) 13.244 Tj
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+(4960 int r = writei\(f->ip, addr, f->off, n\);) 28.896 Tj
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+(4972 // Read from file f. Addr is kernel address.) 30.1 Tj
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+(4976 if\(f->readable == 0\)) 16.254 Tj
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+(4979 return pipe_read\(f->pipe, addr, n\);) 26.488 Tj
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+(4988 panic\("fileread"\);) 16.254 Tj
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+(5101 #include "stat.h") 13.244 Tj
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+(5102 #include "param.h") 13.846 Tj
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+(5103 #include "mmu.h") 12.642 Tj
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+(5104 #include "proc.h") 13.244 Tj
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+(5105 #include "defs.h") 13.244 Tj
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+(5106 #include "x86.h") 12.642 Tj
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+(5107 #include "traps.h") 13.846 Tj
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+(5110 #include "buf.h") 12.642 Tj
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+0 -49.7454 Td
+(5135 }) 3.612 Tj
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+(5136 ) 3.01 Tj
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+(5137 ) 3.01 Tj
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+(5138 ) 3.01 Tj
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+0 -3.92728 Td
+(5150 // Allocate a file descriptor for the given file.) 32.508 Tj
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+(5151 // Takes over file reference from caller on success.) 34.314 Tj
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+(5152 static int) 9.03 Tj
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+(5155 int fd;) 8.428 Tj
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+(5156 struct proc *p = curproc[cpu\(\)];) 23.478 Tj
+0 -13.0909 Td
+(5157 for\(fd = 0; fd < NOFILE; fd++\){) 22.876 Tj
+0 -14.4 Td
+(5158 if\(p->ofile[fd] == 0\){) 18.662 Tj
+0 -15.7091 Td
+(5159 p->ofile[fd] = f;) 16.856 Tj
+0 -17.0182 Td
+(5160 return fd;) 12.642 Tj
+0 -18.3273 Td
+(5161 }) 6.02 Tj
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+(5162 }) 4.816 Tj
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+(5163 return -1;) 10.234 Tj
+0 -22.2545 Td
+(5164 }) 3.612 Tj
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+(5165 ) 3.01 Tj
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+(5166 int) 4.816 Tj
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+(5167 sys_pipe\(void\)) 11.438 Tj
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+(5169 int *fd;) 9.03 Tj
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+(5170 struct file *rf = 0, *wf = 0;) 21.672 Tj
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+(5171 int fd0, fd1;) 12.04 Tj
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+(5172 struct proc *p = curproc[cpu\(\)];) 23.478 Tj
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+(5177 return -1;) 11.438 Tj
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+(5183 fileclose\(wf\);) 13.846 Tj
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+(5185 }) 4.816 Tj
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+(5186 fd[0] = fd0;) 11.438 Tj
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+(5187 fd[1] = fd1;) 11.438 Tj
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+(5188 return 0;) 9.632 Tj
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+(5220 return -1;) 11.438 Tj
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+(5231 return -1;) 11.438 Tj
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+(5232 curproc[cpu\(\)]->ofile[fd] = 0;) 22.274 Tj
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+(5260 if\(argstr\(0, &path\) < 0 || argint\(1, &omode\) < 0\)) 33.712 Tj
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+(5261 return -1;) 11.438 Tj
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+(5262 ) 3.01 Tj
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+(5263 if\(omode & O_CREATE\){) 16.856 Tj
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+(5264 dp = namei\(path, NAMEI_CREATE, 0, &last, &ip\);) 33.11 Tj
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+(5265 if\(dp\){) 9.632 Tj
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+(5266 ip = mknod1\(dp, last, T_FILE, 0, 0\);) 28.294 Tj
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+(5270 } else if\(ip == 0\){) 16.856 Tj
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+(5272 } else if\(ip->type == T_DIR\){) 22.876 Tj
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+(5273 iput\(ip\);) 12.04 Tj
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+(5276 } else {) 9.03 Tj
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+(5286 if\(\(f = filealloc\(\)\) == 0\){) 20.468 Tj
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+(5290 if\(\(fd = fdalloc\(f\)\) < 0\){) 19.866 Tj
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+(5300 iunlock\(ip\);) 11.438 Tj
+0 -5.23637 Td
+(5301 f->type = FD_FILE;) 15.05 Tj
+0 -6.54546 Td
+(5302 if\(omode & O_RDWR\) {) 16.254 Tj
+0 -7.85455 Td
+(5303 f->readable = 1;) 15.05 Tj
+0 -9.16364 Td
+(5304 f->writable = 1;) 15.05 Tj
+0 -10.4727 Td
+(5305 } else if\(omode & O_WRONLY\) {) 21.672 Tj
+0 -11.7818 Td
+(5306 f->readable = 0;) 15.05 Tj
+0 -13.0909 Td
+(5307 f->writable = 1;) 15.05 Tj
+0 -14.4 Td
+(5308 } else {) 9.03 Tj
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+(5309 f->readable = 1;) 15.05 Tj
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+(5310 f->writable = 0;) 15.05 Tj
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+(5311 }) 4.816 Tj
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+(5312 f->ip = ip;) 10.836 Tj
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+(5313 f->off = 0;) 10.836 Tj
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+(5330 if\(len >= DIRSIZ\)) 14.448 Tj
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+(5334 return -1;) 11.438 Tj
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+(5351 sys_mkdir\(void\)) 12.04 Tj
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+(5354 struct inode *dp;) 14.448 Tj
+0 -10.4727 Td
+(5355 char *path;) 10.836 Tj
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+(5356 struct dirent de;) 14.448 Tj
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+(5358 ) 3.01 Tj
+0 -15.7091 Td
+(5359 if\(argstr\(0, &path\) < 0\)) 18.662 Tj
+0 -17.0182 Td
+(5360 return -1;) 11.438 Tj
+0 -18.3273 Td
+(5361 ) 3.01 Tj
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+(5362 dp = namei\(path, NAMEI_CREATE, 0, &last, 0\);) 30.702 Tj
+0 -20.9455 Td
+(5363 if\(dp == 0\)) 10.836 Tj
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+(5364 return -1;) 11.438 Tj
+0 -23.5636 Td
+(5365 ) 3.01 Tj
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+(5366 nip = mknod1\(dp, last, T_DIR, 0, 0\);) 25.886 Tj
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+(5367 if\(nip == 0\){) 12.04 Tj
+0 -27.4909 Td
+(5368 iput\(dp\);) 10.836 Tj
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+(5369 return -1;) 11.438 Tj
+0 -30.1091 Td
+(5370 }) 4.816 Tj
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+(5371 ) 3.01 Tj
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+(5372 dp->nlink++;) 11.438 Tj
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+(5374 ) 3.01 Tj
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+(5376 de.name[0] = '.';) 14.448 Tj
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+(5377 de.inum = nip->inum;) 16.254 Tj
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+(5378 writei\(nip, \(char*\) &de, 0, sizeof\(de\)\);) 28.294 Tj
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+(5379 ) 3.01 Tj
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+(5380 de.inum = dp->inum;) 15.652 Tj
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+(5381 de.name[1] = '.';) 14.448 Tj
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+(5382 writei\(nip, \(char*\) &de, sizeof\(de\), sizeof\(de\)\);) 33.712 Tj
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+(5384 iput\(dp\);) 9.632 Tj
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+(5385 iput\(nip\);) 10.234 Tj
+0 -51.0545 Td
+(5386 ) 3.01 Tj
+0 -52.3636 Td
+(5387 return 0;) 9.632 Tj
+0 -53.6727 Td
+(5388 }) 3.612 Tj
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+(5389 ) 3.01 Tj
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+(5390 ) 3.01 Tj
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+(5391 ) 3.01 Tj
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+(5394 ) 3.01 Tj
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+(5395 ) 3.01 Tj
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+(5396 ) 3.01 Tj
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+(5397 ) 3.01 Tj
+0 -66.7636 Td
+(5398 ) 3.01 Tj
+0 -68.0727 Td
+(5399 ) 3.01 Tj
+0 -72 Td
+(Sheet 53) 4.816 Tj
+Q
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+Q
+showpage
+%%PageTrailer
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+(Sep 8 11:37 2006 xv6/sysfile.c Page 7) 24.08 Tj
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+(5400 int) 4.816 Tj
+0 -5.23637 Td
+(5401 sys_chdir\(void\)) 12.04 Tj
+0 -6.54546 Td
+(5402 {) 3.612 Tj
+0 -7.85455 Td
+(5403 struct proc *p = curproc[cpu\(\)];) 23.478 Tj
+0 -9.16364 Td
+(5404 struct inode *ip;) 14.448 Tj
+0 -10.4727 Td
+(5405 char *path;) 10.836 Tj
+0 -11.7818 Td
+(5406 ) 3.01 Tj
+0 -13.0909 Td
+(5407 if\(argstr\(0, &path\) < 0\)) 18.662 Tj
+0 -14.4 Td
+(5408 return -1;) 11.438 Tj
+0 -15.7091 Td
+(5409 ) 3.01 Tj
+0 -17.0182 Td
+(5410 if\(\(ip = namei\(path, NAMEI_LOOKUP, 0, 0, 0\)\) == 0\)) 34.314 Tj
+0 -18.3273 Td
+(5411 return -1;) 11.438 Tj
+0 -19.6364 Td
+(5412 ) 3.01 Tj
+0 -20.9455 Td
+(5413 if\(ip == p->cwd\) {) 15.05 Tj
+0 -22.2545 Td
+(5414 iput\(ip\);) 10.836 Tj
+0 -23.5636 Td
+(5415 return 0;) 10.836 Tj
+0 -24.8727 Td
+(5416 }) 4.816 Tj
+0 -26.1818 Td
+(5417 ) 3.01 Tj
+0 -27.4909 Td
+(5418 if\(ip->type != T_DIR\) {) 18.06 Tj
+0 -28.8 Td
+(5419 iput\(ip\);) 10.836 Tj
+0 -30.1091 Td
+(5420 return -1;) 11.438 Tj
+0 -31.4182 Td
+(5421 }) 4.816 Tj
+0 -32.7273 Td
+(5422 ) 3.01 Tj
+0 -34.0364 Td
+(5423 idecref\(p->cwd\);) 13.846 Tj
+0 -35.3454 Td
+(5424 p->cwd = ip;) 11.438 Tj
+0 -36.6545 Td
+(5425 iunlock\(p->cwd\);) 13.846 Tj
+0 -37.9636 Td
+(5426 return 0;) 9.632 Tj
+0 -39.2727 Td
+(5427 }) 3.612 Tj
+0 -40.5818 Td
+(5428 ) 3.01 Tj
+0 -41.8909 Td
+(5429 int) 4.816 Tj
+0 -43.2 Td
+(5430 sys_unlink\(void\)) 12.642 Tj
+0 -44.5091 Td
+(5431 {) 3.612 Tj
+0 -45.8182 Td
+(5432 char *path;) 10.836 Tj
+0 -47.1272 Td
+(5433 ) 3.01 Tj
+0 -48.4363 Td
+(5434 if\(argstr\(0, &path\) < 0\)) 18.662 Tj
+0 -49.7454 Td
+(5435 return -1;) 11.438 Tj
+0 -51.0545 Td
+(5436 return unlink\(path\);) 16.254 Tj
+0 -52.3636 Td
+(5437 }) 3.612 Tj
+0 -53.6727 Td
+(5438 ) 3.01 Tj
+0 -54.9818 Td
+(5439 int) 4.816 Tj
+0 -56.2909 Td
+(5440 sys_fstat\(void\)) 12.04 Tj
+0 -57.6 Td
+(5441 {) 3.612 Tj
+0 -58.9091 Td
+(5442 struct file *f;) 13.244 Tj
+0 -60.2181 Td
+(5443 struct stat *st;) 13.846 Tj
+0 -61.5272 Td
+(5444 ) 3.01 Tj
+0 -62.8363 Td
+(5445 if\(argfd\(0, 0, &f\) < 0 || argptr\(1, \(void*\)&st, sizeof *st\) < 0\)) 42.742 Tj
+0 -64.1454 Td
+(5446 return -1;) 11.438 Tj
+0 -65.4545 Td
+(5447 return filestat\(f, st\);) 18.06 Tj
+0 -66.7636 Td
+(5448 }) 3.612 Tj
+0 -68.0727 Td
+(5449 ) 3.01 Tj
+0 -72 Td
+(Sheet 54) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/sysfile.c Page 8) 24.08 Tj
+0 -3.92728 Td
+(5450 int) 4.816 Tj
+0 -5.23637 Td
+(5451 sys_dup\(void\)) 10.836 Tj
+0 -6.54546 Td
+(5452 {) 3.612 Tj
+0 -7.85455 Td
+(5453 struct file *f;) 13.244 Tj
+0 -9.16364 Td
+(5454 int fd;) 8.428 Tj
+0 -10.4727 Td
+(5455 ) 3.01 Tj
+0 -11.7818 Td
+(5456 if\(argfd\(0, 0, &f\) < 0\)) 18.06 Tj
+0 -13.0909 Td
+(5457 return -1;) 11.438 Tj
+0 -14.4 Td
+(5458 if\(\(fd=fdalloc\(f\)\) < 0\)) 18.06 Tj
+0 -15.7091 Td
+(5459 return -1;) 11.438 Tj
+0 -17.0182 Td
+(5460 fileincref\(f\);) 12.642 Tj
+0 -18.3273 Td
+(5461 return fd;) 10.234 Tj
+0 -19.6364 Td
+(5462 }) 3.612 Tj
+0 -20.9455 Td
+(5463 ) 3.01 Tj
+0 -22.2545 Td
+(5464 int) 4.816 Tj
+0 -23.5636 Td
+(5465 sys_link\(void\)) 11.438 Tj
+0 -24.8727 Td
+(5466 {) 3.612 Tj
+0 -26.1818 Td
+(5467 char *old, *new;) 13.846 Tj
+0 -27.4909 Td
+(5468 ) 3.01 Tj
+0 -28.8 Td
+(5469 if\(argstr\(0, &old\) < 0 || argstr\(1, &new\) < 0\)) 31.906 Tj
+0 -30.1091 Td
+(5470 return -1;) 11.438 Tj
+0 -31.4182 Td
+(5471 return link\(old, new\);) 17.458 Tj
+0 -32.7273 Td
+(5472 }) 3.612 Tj
+0 -34.0364 Td
+(5473 ) 3.01 Tj
+0 -35.3454 Td
+(5474 int) 4.816 Tj
+0 -36.6545 Td
+(5475 sys_exec\(void\)) 11.438 Tj
+0 -37.9636 Td
+(5476 {) 3.612 Tj
+0 -39.2727 Td
+(5477 struct proc *cp = curproc[cpu\(\)];) 24.08 Tj
+0 -40.5818 Td
+(5478 uint sz=0, ap, sp, p1, p2;) 19.866 Tj
+0 -41.8909 Td
+(5479 int i, nargs, argbytes, len;) 21.07 Tj
+0 -43.2 Td
+(5480 struct inode *ip;) 14.448 Tj
+0 -44.5091 Td
+(5481 struct elfhdr elf;) 15.05 Tj
+0 -45.8182 Td
+(5482 struct proghdr ph;) 15.05 Tj
+0 -47.1272 Td
+(5483 char *mem = 0;) 12.642 Tj
+0 -48.4363 Td
+(5484 char *path, *s;) 13.244 Tj
+0 -49.7454 Td
+(5485 uint argv;) 10.234 Tj
+0 -51.0545 Td
+(5486 ) 3.01 Tj
+0 -52.3636 Td
+(5487 if\(argstr\(0, &path\) < 0 || argint\(1, \(int*\)&argv\) < 0\)) 36.722 Tj
+0 -53.6727 Td
+(5488 return -1;) 11.438 Tj
+0 -54.9818 Td
+(5489 ) 3.01 Tj
+0 -56.2909 Td
+(5490 ip = namei\(path, NAMEI_LOOKUP, 0, 0, 0\);) 28.294 Tj
+0 -57.6 Td
+(5491 if\(ip == 0\)) 10.836 Tj
+0 -58.9091 Td
+(5492 return -1;) 11.438 Tj
+0 -60.2181 Td
+(5493 ) 3.01 Tj
+0 -61.5272 Td
+(5494 if\(readi\(ip, \(char*\)&elf, 0, sizeof\(elf\)\) < sizeof\(elf\)\)) 37.926 Tj
+0 -62.8363 Td
+(5495 goto bad;) 10.836 Tj
+0 -64.1454 Td
+(5496 ) 3.01 Tj
+0 -65.4545 Td
+(5497 if\(elf.magic != ELF_MAGIC\)) 19.866 Tj
+0 -66.7636 Td
+(5498 goto bad;) 10.836 Tj
+0 -68.0727 Td
+(5499 ) 3.01 Tj
+0 -72 Td
+(Sheet 54) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 62 62
+%%BeginPageSetup
+%%PageOrientation: Landscape
+__tumble pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/sysfile.c Page 9) 24.08 Tj
+0 -3.92728 Td
+(5500 sz = 0;) 8.428 Tj
+0 -5.23637 Td
+(5501 for\(i = 0; i < elf.phnum; i++\){) 22.876 Tj
+0 -6.54546 Td
+(5502 if\(readi\(ip, \(char*\)&ph, elf.phoff + i * sizeof\(ph\),) 36.722 Tj
+0 -7.85455 Td
+(5503 sizeof\(ph\)\) != sizeof\(ph\)\)) 26.488 Tj
+0 -9.16364 Td
+(5504 goto bad;) 12.04 Tj
+0 -10.4727 Td
+(5505 if\(ph.type != ELF_PROG_LOAD\)) 22.274 Tj
+0 -11.7818 Td
+(5506 continue;) 12.04 Tj
+0 -13.0909 Td
+(5507 if\(ph.memsz < ph.filesz\)) 19.866 Tj
+0 -14.4 Td
+(5508 goto bad;) 12.04 Tj
+0 -15.7091 Td
+(5509 sz += ph.memsz;) 14.448 Tj
+0 -17.0182 Td
+(5510 }) 4.816 Tj
+0 -18.3273 Td
+(5511 ) 3.01 Tj
+0 -19.6364 Td
+(5512 sz += 4096 - \(sz % 4096\);) 19.264 Tj
+0 -20.9455 Td
+(5513 sz += 4096;) 10.836 Tj
+0 -22.2545 Td
+(5514 ) 3.01 Tj
+0 -23.5636 Td
+(5515 mem = kalloc\(sz\);) 14.448 Tj
+0 -24.8727 Td
+(5516 if\(mem == 0\)) 11.438 Tj
+0 -26.1818 Td
+(5517 goto bad;) 10.836 Tj
+0 -27.4909 Td
+(5518 memset\(mem, 0, sz\);) 15.652 Tj
+0 -28.8 Td
+(5519 ) 3.01 Tj
+0 -30.1091 Td
+(5520 nargs = 0;) 10.234 Tj
+0 -31.4182 Td
+(5521 argbytes = 0;) 12.04 Tj
+0 -32.7273 Td
+(5522 for\(i = 0;; i++\){) 14.448 Tj
+0 -34.0364 Td
+(5523 if\(fetchint\(cp, argv + 4*i, \(int*\)&ap\) < 0\)) 31.304 Tj
+0 -35.3454 Td
+(5524 goto bad;) 12.04 Tj
+0 -36.6545 Td
+(5525 if\(ap == 0\)) 12.04 Tj
+0 -37.9636 Td
+(5526 break;) 10.234 Tj
+0 -39.2727 Td
+(5527 len = fetchstr\(cp, ap, &s\);) 21.672 Tj
+0 -40.5818 Td
+(5528 if\(len < 0\)) 12.04 Tj
+0 -41.8909 Td
+(5529 goto bad;) 12.04 Tj
+0 -43.2 Td
+(5530 nargs++;) 10.234 Tj
+0 -44.5091 Td
+(5531 argbytes += len + 1;) 17.458 Tj
+0 -45.8182 Td
+(5532 }) 4.816 Tj
+0 -47.1272 Td
+(5533 ) 3.01 Tj
+0 -48.4363 Td
+(5534 // argn\\0) 9.632 Tj
+0 -49.7454 Td
+(5535 // ...) 7.826 Tj
+0 -51.0545 Td
+(5536 // arg0\\0) 9.632 Tj
+0 -52.3636 Td
+(5537 // 0) 6.622 Tj
+0 -53.6727 Td
+(5538 // ptr to argn) 12.642 Tj
+0 -54.9818 Td
+(5539 // ...) 7.826 Tj
+0 -56.2909 Td
+(5540 // 12: ptr to arg0) 15.05 Tj
+0 -57.6 Td
+(5541 // 8: argv \(points to ptr to arg0\)) 25.284 Tj
+0 -58.9091 Td
+(5542 // 4: argc) 10.836 Tj
+0 -60.2181 Td
+(5543 // 0: fake return pc) 16.856 Tj
+0 -61.5272 Td
+(5544 sp = sz - argbytes - \(nargs+1\)*4 - 4 - 4 - 4;) 31.304 Tj
+0 -62.8363 Td
+(5545 *\(uint*\)\(mem + sp\) = 0xffffffff;) 23.478 Tj
+0 -64.1454 Td
+(5546 *\(uint*\)\(mem + sp + 4\) = nargs;) 22.876 Tj
+0 -65.4545 Td
+(5547 *\(uint*\)\(mem + sp + 8\) = \(uint\)\(sp + 12\);) 28.896 Tj
+0 -66.7636 Td
+(5548 ) 3.01 Tj
+0 -68.0727 Td
+(5549 ) 3.01 Tj
+0 -72 Td
+(Sheet 55) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/sysfile.c Page 10) 24.682 Tj
+0 -3.92728 Td
+(5550 p1 = sp + 12;) 12.04 Tj
+0 -5.23637 Td
+(5551 p2 = sp + 12 + \(nargs + 1\) * 4;) 22.876 Tj
+0 -6.54546 Td
+(5552 for\(i = 0; i < nargs; i++\){) 20.468 Tj
+0 -7.85455 Td
+(5553 fetchint\(cp, argv + 4*i, \(int*\)&ap\);) 27.09 Tj
+0 -9.16364 Td
+(5554 len = fetchstr\(cp, ap, &s\);) 21.672 Tj
+0 -10.4727 Td
+(5555 memmove\(mem + p2, s, len + 1\);) 23.478 Tj
+0 -11.7818 Td
+(5556 *\(uint*\)\(mem + p1\) = p2;) 19.866 Tj
+0 -13.0909 Td
+(5557 p1 += 4;) 10.234 Tj
+0 -14.4 Td
+(5558 p2 += len + 1;) 13.846 Tj
+0 -15.7091 Td
+(5559 }) 4.816 Tj
+0 -17.0182 Td
+(5560 *\(uint*\)\(mem + p1\) = 0;) 18.06 Tj
+0 -18.3273 Td
+(5561 ) 3.01 Tj
+0 -19.6364 Td
+(5562 // commit to the new image.) 20.468 Tj
+0 -20.9455 Td
+(5563 kfree\(cp->mem, cp->sz\);) 18.06 Tj
+0 -22.2545 Td
+(5564 cp->sz = sz;) 11.438 Tj
+0 -23.5636 Td
+(5565 cp->mem = mem;) 12.642 Tj
+0 -24.8727 Td
+(5566 mem = 0;) 9.03 Tj
+0 -26.1818 Td
+(5567 ) 3.01 Tj
+0 -27.4909 Td
+(5568 for\(i = 0; i < elf.phnum; i++\){) 22.876 Tj
+0 -28.8 Td
+(5569 if\(readi\(ip, \(char*\)&ph, elf.phoff + i * sizeof\(ph\),) 36.722 Tj
+0 -30.1091 Td
+(5570 sizeof\(ph\)\) != sizeof\(ph\)\)) 26.488 Tj
+0 -31.4182 Td
+(5571 goto bad2;) 12.642 Tj
+0 -32.7273 Td
+(5572 if\(ph.type != ELF_PROG_LOAD\)) 22.274 Tj
+0 -34.0364 Td
+(5573 continue;) 12.04 Tj
+0 -35.3454 Td
+(5574 if\(ph.va + ph.memsz > sz\)) 20.468 Tj
+0 -36.6545 Td
+(5575 goto bad2;) 12.642 Tj
+0 -37.9636 Td
+(5576 if\(readi\(ip, cp->mem + ph.va, ph.offset, ph.filesz\) != ph.filesz\)) 44.548 Tj
+0 -39.2727 Td
+(5577 goto bad2;) 12.642 Tj
+0 -40.5818 Td
+(5578 memset\(cp->mem + ph.va + ph.filesz, 0, ph.memsz - ph.filesz\);) 42.14 Tj
+0 -41.8909 Td
+(5579 }) 4.816 Tj
+0 -43.2 Td
+(5580 ) 3.01 Tj
+0 -44.5091 Td
+(5581 iput\(ip\);) 9.632 Tj
+0 -45.8182 Td
+(5582 ) 3.01 Tj
+0 -47.1272 Td
+(5583 cp->tf->eip = elf.entry;) 18.662 Tj
+0 -48.4363 Td
+(5584 cp->tf->esp = sp;) 14.448 Tj
+0 -49.7454 Td
+(5585 setupsegs\(cp\);) 12.642 Tj
+0 -51.0545 Td
+(5586 ) 3.01 Tj
+0 -52.3636 Td
+(5587 return 0;) 9.632 Tj
+0 -53.6727 Td
+(5588 ) 3.01 Tj
+0 -54.9818 Td
+(5589 bad:) 6.02 Tj
+0 -56.2909 Td
+(5590 if\(mem\)) 8.428 Tj
+0 -57.6 Td
+(5591 kfree\(mem, sz\);) 14.448 Tj
+0 -58.9091 Td
+(5592 iput\(ip\);) 9.632 Tj
+0 -60.2181 Td
+(5593 return -1;) 10.234 Tj
+0 -61.5272 Td
+(5594 ) 3.01 Tj
+0 -62.8363 Td
+(5595 bad2:) 6.622 Tj
+0 -64.1454 Td
+(5596 iput\(ip\);) 9.632 Tj
+0 -65.4545 Td
+(5597 proc_exit\(\);) 11.438 Tj
+0 -66.7636 Td
+(5598 return 0;) 9.632 Tj
+0 -68.0727 Td
+(5599 }) 3.612 Tj
+0 -72 Td
+(Sheet 55) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 63 63
+%%BeginPageSetup
+%%PageOrientation: Landscape
+pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/pipe.c Page 1) 22.274 Tj
+0 -3.92728 Td
+(5600 #include "types.h") 13.846 Tj
+0 -5.23637 Td
+(5601 #include "param.h") 13.846 Tj
+0 -6.54546 Td
+(5602 #include "x86.h") 12.642 Tj
+0 -7.85455 Td
+(5603 #include "mmu.h") 12.642 Tj
+0 -9.16364 Td
+(5604 #include "proc.h") 13.244 Tj
+0 -10.4727 Td
+(5605 #include "defs.h") 13.244 Tj
+0 -11.7818 Td
+(5606 #include "file.h") 13.244 Tj
+0 -13.0909 Td
+(5607 #include "spinlock.h") 15.652 Tj
+0 -14.4 Td
+(5608 ) 3.01 Tj
+0 -15.7091 Td
+(5609 #define PIPESIZE 512) 15.05 Tj
+0 -17.0182 Td
+(5610 ) 3.01 Tj
+0 -18.3273 Td
+(5611 struct pipe {) 10.836 Tj
+0 -19.6364 Td
+(5612 int readopen; // read fd is still open) 27.09 Tj
+0 -20.9455 Td
+(5613 int writeopen; // write fd is still open) 28.294 Tj
+0 -22.2545 Td
+(5614 int writep; // next index to write) 24.682 Tj
+0 -23.5636 Td
+(5615 int readp; // next index to read) 24.08 Tj
+0 -24.8727 Td
+(5616 struct spinlock lock;) 16.856 Tj
+0 -26.1818 Td
+(5617 char data[PIPESIZE];) 16.254 Tj
+0 -27.4909 Td
+(5618 };) 4.214 Tj
+0 -28.8 Td
+(5619 ) 3.01 Tj
+0 -30.1091 Td
+(5620 int) 4.816 Tj
+0 -31.4182 Td
+(5621 pipe_alloc\(struct file **f0, struct file **f1\)) 30.702 Tj
+0 -32.7273 Td
+(5622 {) 3.612 Tj
+0 -34.0364 Td
+(5623 *f0 = *f1 = 0;) 12.642 Tj
+0 -35.3454 Td
+(5624 struct pipe *p = 0;) 15.652 Tj
+0 -36.6545 Td
+(5625 ) 3.01 Tj
+0 -37.9636 Td
+(5626 if\(\(*f0 = filealloc\(\)\) == 0\)) 21.07 Tj
+0 -39.2727 Td
+(5627 goto oops;) 11.438 Tj
+0 -40.5818 Td
+(5628 if\(\(*f1 = filealloc\(\)\) == 0\)) 21.07 Tj
+0 -41.8909 Td
+(5629 goto oops;) 11.438 Tj
+0 -43.2 Td
+(5630 if\(\(p = \(struct pipe*\) kalloc\(PAGE\)\) == 0\)) 29.498 Tj
+0 -44.5091 Td
+(5631 goto oops;) 11.438 Tj
+0 -45.8182 Td
+(5632 p->readopen = 1;) 13.846 Tj
+0 -47.1272 Td
+(5633 p->writeopen = 1;) 14.448 Tj
+0 -48.4363 Td
+(5634 p->writep = 0;) 12.642 Tj
+0 -49.7454 Td
+(5635 p->readp = 0;) 12.04 Tj
+0 -51.0545 Td
+(5636 initlock\(&p->lock, "pipe"\);) 20.468 Tj
+0 -52.3636 Td
+(5637 \(*f0\)->type = FD_PIPE;) 17.458 Tj
+0 -53.6727 Td
+(5638 \(*f0\)->readable = 1;) 16.254 Tj
+0 -54.9818 Td
+(5639 \(*f0\)->writable = 0;) 16.254 Tj
+0 -56.2909 Td
+(5640 \(*f0\)->pipe = p;) 13.846 Tj
+0 -57.6 Td
+(5641 \(*f1\)->type = FD_PIPE;) 17.458 Tj
+0 -58.9091 Td
+(5642 \(*f1\)->readable = 0;) 16.254 Tj
+0 -60.2181 Td
+(5643 \(*f1\)->writable = 1;) 16.254 Tj
+0 -61.5272 Td
+(5644 \(*f1\)->pipe = p;) 13.846 Tj
+0 -62.8363 Td
+(5645 return 0;) 9.632 Tj
+0 -64.1454 Td
+(5646 oops:) 6.622 Tj
+0 -65.4545 Td
+(5647 if\(p\)) 7.224 Tj
+0 -66.7636 Td
+(5648 kfree\(\(char*\) p, PAGE\);) 19.264 Tj
+0 -68.0727 Td
+(5649 if\(*f0\){) 9.03 Tj
+0 -72 Td
+(Sheet 56) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/pipe.c Page 2) 22.274 Tj
+0 -3.92728 Td
+(5650 \(*f0\)->type = FD_NONE;) 18.662 Tj
+0 -5.23637 Td
+(5651 fileclose\(*f0\);) 14.448 Tj
+0 -6.54546 Td
+(5652 }) 4.816 Tj
+0 -7.85455 Td
+(5653 if\(*f1\){) 9.03 Tj
+0 -9.16364 Td
+(5654 \(*f1\)->type = FD_NONE;) 18.662 Tj
+0 -10.4727 Td
+(5655 fileclose\(*f1\);) 14.448 Tj
+0 -11.7818 Td
+(5656 }) 4.816 Tj
+0 -13.0909 Td
+(5657 return -1;) 10.234 Tj
+0 -14.4 Td
+(5658 }) 3.612 Tj
+0 -15.7091 Td
+(5659 ) 3.01 Tj
+0 -17.0182 Td
+(5660 void) 5.418 Tj
+0 -18.3273 Td
+(5661 pipe_close\(struct pipe *p, int writable\)) 27.09 Tj
+0 -19.6364 Td
+(5662 {) 3.612 Tj
+0 -20.9455 Td
+(5663 acquire\(&p->lock\);) 15.05 Tj
+0 -22.2545 Td
+(5664 ) 3.01 Tj
+0 -23.5636 Td
+(5665 if\(writable\){) 12.04 Tj
+0 -24.8727 Td
+(5666 p->writeopen = 0;) 15.652 Tj
+0 -26.1818 Td
+(5667 wakeup\(&p->readp\);) 16.254 Tj
+0 -27.4909 Td
+(5668 } else {) 9.03 Tj
+0 -28.8 Td
+(5669 p->readopen = 0;) 15.05 Tj
+0 -30.1091 Td
+(5670 wakeup\(&p->writep\);) 16.856 Tj
+0 -31.4182 Td
+(5671 }) 4.816 Tj
+0 -32.7273 Td
+(5672 ) 3.01 Tj
+0 -34.0364 Td
+(5673 release\(&p->lock\);) 15.05 Tj
+0 -35.3454 Td
+(5674 ) 3.01 Tj
+0 -36.6545 Td
+(5675 if\(p->readopen == 0 && p->writeopen == 0\)) 28.896 Tj
+0 -37.9636 Td
+(5676 kfree\(\(char*\) p, PAGE\);) 19.264 Tj
+0 -39.2727 Td
+(5677 }) 3.612 Tj
+0 -40.5818 Td
+(5678 ) 3.01 Tj
+0 -41.8909 Td
+(5679 int) 4.816 Tj
+0 -43.2 Td
+(5680 pipe_write\(struct pipe *p, char *addr, int n\)) 30.1 Tj
+0 -44.5091 Td
+(5681 {) 3.612 Tj
+0 -45.8182 Td
+(5682 int i;) 7.826 Tj
+0 -47.1272 Td
+(5683 ) 3.01 Tj
+0 -48.4363 Td
+(5684 acquire\(&p->lock\);) 15.05 Tj
+0 -49.7454 Td
+(5685 ) 3.01 Tj
+0 -51.0545 Td
+(5686 for\(i = 0; i < n; i++\){) 18.06 Tj
+0 -52.3636 Td
+(5687 while\(\(\(p->writep + 1\) % PIPESIZE\) == p->readp\){) 34.314 Tj
+0 -53.6727 Td
+(5688 if\(p->readopen == 0\){) 19.264 Tj
+0 -54.9818 Td
+(5689 release\(&p->lock\);) 18.662 Tj
+0 -56.2909 Td
+(5690 return -1;) 13.846 Tj
+0 -57.6 Td
+(5691 }) 7.224 Tj
+0 -58.9091 Td
+(5692 wakeup\(&p->readp\);) 17.458 Tj
+0 -60.2181 Td
+(5693 sleep\(&p->writep, &p->lock\);) 23.478 Tj
+0 -61.5272 Td
+(5694 }) 6.02 Tj
+0 -62.8363 Td
+(5695 p->data[p->writep] = addr[i];) 22.876 Tj
+0 -64.1454 Td
+(5696 p->writep = \(p->writep + 1\) % PIPESIZE;) 28.896 Tj
+0 -65.4545 Td
+(5697 }) 4.816 Tj
+0 -66.7636 Td
+(5698 ) 3.01 Tj
+0 -68.0727 Td
+(5699 ) 3.01 Tj
+0 -72 Td
+(Sheet 56) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 64 64
+%%BeginPageSetup
+%%PageOrientation: Landscape
+__tumble pdfStartPage
+%%EndPageSetup
+[] 0 d
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+10 M
+1 w
+0 g
+0 G
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+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/pipe.c Page 3) 22.274 Tj
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+(5700 release\(&p->lock\);) 15.05 Tj
+0 -5.23637 Td
+(5701 wakeup\(&p->readp\);) 15.05 Tj
+0 -6.54546 Td
+(5702 return i;) 9.632 Tj
+0 -7.85455 Td
+(5703 }) 3.612 Tj
+0 -9.16364 Td
+(5704 ) 3.01 Tj
+0 -10.4727 Td
+(5705 int) 4.816 Tj
+0 -11.7818 Td
+(5706 pipe_read\(struct pipe *p, char *addr, int n\)) 29.498 Tj
+0 -13.0909 Td
+(5707 {) 3.612 Tj
+0 -14.4 Td
+(5708 int i;) 7.826 Tj
+0 -15.7091 Td
+(5709 ) 3.01 Tj
+0 -17.0182 Td
+(5710 acquire\(&p->lock\);) 15.05 Tj
+0 -18.3273 Td
+(5711 ) 3.01 Tj
+0 -19.6364 Td
+(5712 while\(p->readp == p->writep\){) 21.672 Tj
+0 -20.9455 Td
+(5713 if\(p->writeopen == 0\){) 18.662 Tj
+0 -22.2545 Td
+(5714 release\(&p->lock\);) 17.458 Tj
+0 -23.5636 Td
+(5715 return 0;) 12.04 Tj
+0 -24.8727 Td
+(5716 }) 6.02 Tj
+0 -26.1818 Td
+(5717 sleep\(&p->readp, &p->lock\);) 21.672 Tj
+0 -27.4909 Td
+(5718 }) 4.816 Tj
+0 -28.8 Td
+(5719 ) 3.01 Tj
+0 -30.1091 Td
+(5720 for\(i = 0; i < n; i++\){) 18.06 Tj
+0 -31.4182 Td
+(5721 if\(p->readp == p->writep\)) 20.468 Tj
+0 -32.7273 Td
+(5722 break;) 10.234 Tj
+0 -34.0364 Td
+(5723 addr[i] = p->data[p->readp];) 22.274 Tj
+0 -35.3454 Td
+(5724 p->readp = \(p->readp + 1\) % PIPESIZE;) 27.692 Tj
+0 -36.6545 Td
+(5725 }) 4.816 Tj
+0 -37.9636 Td
+(5726 ) 3.01 Tj
+0 -39.2727 Td
+(5727 release\(&p->lock\);) 15.05 Tj
+0 -40.5818 Td
+(5728 wakeup\(&p->writep\);) 15.652 Tj
+0 -41.8909 Td
+(5729 return i;) 9.632 Tj
+0 -43.2 Td
+(5730 }) 3.612 Tj
+0 -44.5091 Td
+(5731 ) 3.01 Tj
+0 -45.8182 Td
+(5732 ) 3.01 Tj
+0 -47.1272 Td
+(5733 ) 3.01 Tj
+0 -48.4363 Td
+(5734 ) 3.01 Tj
+0 -49.7454 Td
+(5735 ) 3.01 Tj
+0 -51.0545 Td
+(5736 ) 3.01 Tj
+0 -52.3636 Td
+(5737 ) 3.01 Tj
+0 -53.6727 Td
+(5738 ) 3.01 Tj
+0 -54.9818 Td
+(5739 ) 3.01 Tj
+0 -56.2909 Td
+(5740 ) 3.01 Tj
+0 -57.6 Td
+(5741 ) 3.01 Tj
+0 -58.9091 Td
+(5742 ) 3.01 Tj
+0 -60.2181 Td
+(5743 ) 3.01 Tj
+0 -61.5272 Td
+(5744 ) 3.01 Tj
+0 -62.8363 Td
+(5745 ) 3.01 Tj
+0 -64.1454 Td
+(5746 ) 3.01 Tj
+0 -65.4545 Td
+(5747 ) 3.01 Tj
+0 -66.7636 Td
+(5748 ) 3.01 Tj
+0 -68.0727 Td
+(5749 ) 3.01 Tj
+0 -72 Td
+(Sheet 57) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/string.c Page 1) 23.478 Tj
+0 -3.92728 Td
+(5750 #include "types.h") 13.846 Tj
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+(5751 #include "defs.h") 13.244 Tj
+0 -6.54546 Td
+(5752 ) 3.01 Tj
+0 -7.85455 Td
+(5753 void*) 6.02 Tj
+0 -9.16364 Td
+(5754 memset\(void *dst, int c, uint n\)) 22.274 Tj
+0 -10.4727 Td
+(5755 {) 3.612 Tj
+0 -11.7818 Td
+(5756 char *d = \(char*\) dst;) 17.458 Tj
+0 -13.0909 Td
+(5757 ) 3.01 Tj
+0 -14.4 Td
+(5758 while\(n-- > 0\)) 12.642 Tj
+0 -15.7091 Td
+(5759 *d++ = c;) 10.836 Tj
+0 -17.0182 Td
+(5760 ) 3.01 Tj
+0 -18.3273 Td
+(5761 return dst;) 10.836 Tj
+0 -19.6364 Td
+(5762 }) 3.612 Tj
+0 -20.9455 Td
+(5763 ) 3.01 Tj
+0 -22.2545 Td
+(5764 int) 4.816 Tj
+0 -23.5636 Td
+(5765 memcmp\(const void *v1, const void *v2, uint n\)) 30.702 Tj
+0 -24.8727 Td
+(5766 {) 3.612 Tj
+0 -26.1818 Td
+(5767 const uchar *s1 = \(const uchar*\) v1;) 25.886 Tj
+0 -27.4909 Td
+(5768 const uchar *s2 = \(const uchar*\) v2;) 25.886 Tj
+0 -28.8 Td
+(5769 ) 3.01 Tj
+0 -30.1091 Td
+(5770 while\(n-- > 0\) {) 13.846 Tj
+0 -31.4182 Td
+(5771 if\(*s1 != *s2\)) 13.846 Tj
+0 -32.7273 Td
+(5772 return \(int\) *s1 - \(int\) *s2;) 24.08 Tj
+0 -34.0364 Td
+(5773 s1++, s2++;) 12.04 Tj
+0 -35.3454 Td
+(5774 }) 4.816 Tj
+0 -36.6545 Td
+(5775 ) 3.01 Tj
+0 -37.9636 Td
+(5776 return 0;) 9.632 Tj
+0 -39.2727 Td
+(5777 }) 3.612 Tj
+0 -40.5818 Td
+(5778 ) 3.01 Tj
+0 -41.8909 Td
+(5779 void*) 6.02 Tj
+0 -43.2 Td
+(5780 memmove\(void *dst, const void *src, uint n\)) 28.896 Tj
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+(5781 {) 3.612 Tj
+0 -45.8182 Td
+(5782 const char *s;) 12.642 Tj
+0 -47.1272 Td
+(5783 char *d;) 9.03 Tj
+0 -48.4363 Td
+(5784 ) 3.01 Tj
+0 -49.7454 Td
+(5785 s = src;) 9.03 Tj
+0 -51.0545 Td
+(5786 d = dst;) 9.03 Tj
+0 -52.3636 Td
+(5787 if\(s < d && s + n > d\) {) 18.662 Tj
+0 -53.6727 Td
+(5788 s += n;) 9.632 Tj
+0 -54.9818 Td
+(5789 d += n;) 9.632 Tj
+0 -56.2909 Td
+(5790 while\(n-- > 0\)) 13.846 Tj
+0 -57.6 Td
+(5791 *--d = *--s;) 13.846 Tj
+0 -58.9091 Td
+(5792 } else) 7.826 Tj
+0 -60.2181 Td
+(5793 while\(n-- > 0\)) 13.846 Tj
+0 -61.5272 Td
+(5794 *d++ = *s++;) 13.846 Tj
+0 -62.8363 Td
+(5795 ) 3.01 Tj
+0 -64.1454 Td
+(5796 return dst;) 10.836 Tj
+0 -65.4545 Td
+(5797 }) 3.612 Tj
+0 -66.7636 Td
+(5798 ) 3.01 Tj
+0 -68.0727 Td
+(5799 ) 3.01 Tj
+0 -72 Td
+(Sheet 57) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 65 65
+%%BeginPageSetup
+%%PageOrientation: Landscape
+pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
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+1 w
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+q
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+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
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+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/string.c Page 2) 23.478 Tj
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+(5800 int) 4.816 Tj
+0 -5.23637 Td
+(5801 strncmp\(const char *p, const char *q, uint n\)) 30.1 Tj
+0 -6.54546 Td
+(5802 {) 3.612 Tj
+0 -7.85455 Td
+(5803 while\(n > 0 && *p && *p == *q\)) 22.274 Tj
+0 -9.16364 Td
+(5804 n--, p++, q++;) 13.846 Tj
+0 -10.4727 Td
+(5805 if\(n == 0\)) 10.234 Tj
+0 -11.7818 Td
+(5806 return 0;) 10.836 Tj
+0 -13.0909 Td
+(5807 else) 6.622 Tj
+0 -14.4 Td
+(5808 return \(int\) \(\(uchar\) *p - \(uchar\) *q\);) 28.896 Tj
+0 -15.7091 Td
+(5809 }) 3.612 Tj
+0 -17.0182 Td
+(5810 ) 3.01 Tj
+0 -18.3273 Td
+(5811 ) 3.01 Tj
+0 -19.6364 Td
+(5812 ) 3.01 Tj
+0 -20.9455 Td
+(5813 ) 3.01 Tj
+0 -22.2545 Td
+(5814 ) 3.01 Tj
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+(5815 ) 3.01 Tj
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+(5816 ) 3.01 Tj
+0 -26.1818 Td
+(5817 ) 3.01 Tj
+0 -27.4909 Td
+(5818 ) 3.01 Tj
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+(5819 ) 3.01 Tj
+0 -30.1091 Td
+(5820 ) 3.01 Tj
+0 -31.4182 Td
+(5821 ) 3.01 Tj
+0 -32.7273 Td
+(5822 ) 3.01 Tj
+0 -34.0364 Td
+(5823 ) 3.01 Tj
+0 -35.3454 Td
+(5824 ) 3.01 Tj
+0 -36.6545 Td
+(5825 ) 3.01 Tj
+0 -37.9636 Td
+(5826 ) 3.01 Tj
+0 -39.2727 Td
+(5827 ) 3.01 Tj
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+(5828 ) 3.01 Tj
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+(5829 ) 3.01 Tj
+0 -43.2 Td
+(5830 ) 3.01 Tj
+0 -44.5091 Td
+(5831 ) 3.01 Tj
+0 -45.8182 Td
+(5832 ) 3.01 Tj
+0 -47.1272 Td
+(5833 ) 3.01 Tj
+0 -48.4363 Td
+(5834 ) 3.01 Tj
+0 -49.7454 Td
+(5835 ) 3.01 Tj
+0 -51.0545 Td
+(5836 ) 3.01 Tj
+0 -52.3636 Td
+(5837 ) 3.01 Tj
+0 -53.6727 Td
+(5838 ) 3.01 Tj
+0 -54.9818 Td
+(5839 ) 3.01 Tj
+0 -56.2909 Td
+(5840 ) 3.01 Tj
+0 -57.6 Td
+(5841 ) 3.01 Tj
+0 -58.9091 Td
+(5842 ) 3.01 Tj
+0 -60.2181 Td
+(5843 ) 3.01 Tj
+0 -61.5272 Td
+(5844 ) 3.01 Tj
+0 -62.8363 Td
+(5845 ) 3.01 Tj
+0 -64.1454 Td
+(5846 ) 3.01 Tj
+0 -65.4545 Td
+(5847 ) 3.01 Tj
+0 -66.7636 Td
+(5848 ) 3.01 Tj
+0 -68.0727 Td
+(5849 ) 3.01 Tj
+0 -72 Td
+(Sheet 58) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/ioapic.h Page 1) 23.478 Tj
+0 -3.92728 Td
+(5850 #define IO_APIC_BASE 0xFEC00000 // Default phys addr of IO APIC) 43.344 Tj
+0 -5.23637 Td
+(5851 #define IOAPIC_WINDOW 0x10 // Window register offset) 39.732 Tj
+0 -6.54546 Td
+(5852 ) 3.01 Tj
+0 -7.85455 Td
+(5853 // Constants relating to APIC ID registers) 28.294 Tj
+0 -9.16364 Td
+(5854 #define APIC_ID_MASK 0xff000000) 28.294 Tj
+0 -10.4727 Td
+(5855 #define APIC_ID_SHIFT 24) 23.478 Tj
+0 -11.7818 Td
+(5856 #define APIC_ID_CLUSTER 0xf0) 24.682 Tj
+0 -13.0909 Td
+(5857 #define APIC_ID_CLUSTER_ID 0x0f) 24.682 Tj
+0 -14.4 Td
+(5858 #define APIC_MAX_CLUSTER 0xe) 24.08 Tj
+0 -15.7091 Td
+(5859 #define APIC_MAX_INTRACLUSTER_ID 3) 23.478 Tj
+0 -17.0182 Td
+(5860 #define APIC_ID_CLUSTER_SHIFT 4) 22.876 Tj
+0 -18.3273 Td
+(5861 ) 3.01 Tj
+0 -19.6364 Td
+(5862 // Fields in VER) 12.642 Tj
+0 -20.9455 Td
+(5863 #define APIC_VER_VERSION 0x000000ff) 28.294 Tj
+0 -22.2545 Td
+(5864 #define APIC_VER_MAXLVT 0x00ff0000) 28.294 Tj
+0 -23.5636 Td
+(5865 #define MAXLVTSHIFT 16) 23.478 Tj
+0 -24.8727 Td
+(5866 ) 3.01 Tj
+0 -26.1818 Td
+(5867 // Indexes into IO APIC) 16.856 Tj
+0 -27.4909 Td
+(5868 #define IOAPIC_ID 0x00) 24.682 Tj
+0 -28.8 Td
+(5869 #define IOAPIC_VER 0x01) 24.682 Tj
+0 -30.1091 Td
+(5870 #define IOAPIC_ARB 0x02) 24.682 Tj
+0 -31.4182 Td
+(5871 #define IOAPIC_REDTBL 0x10) 24.682 Tj
+0 -32.7273 Td
+(5872 #define IOAPIC_REDTBL0 IOAPIC_REDTBL) 30.1 Tj
+0 -34.0364 Td
+(5873 #define IOAPIC_REDTBL1 \(IOAPIC_REDTBL+0x02\)) 34.314 Tj
+0 -35.3454 Td
+(5874 #define IOAPIC_REDTBL2 \(IOAPIC_REDTBL+0x04\)) 34.314 Tj
+0 -36.6545 Td
+(5875 #define IOAPIC_REDTBL3 \(IOAPIC_REDTBL+0x06\)) 34.314 Tj
+0 -37.9636 Td
+(5876 #define IOAPIC_REDTBL4 \(IOAPIC_REDTBL+0x08\)) 34.314 Tj
+0 -39.2727 Td
+(5877 #define IOAPIC_REDTBL5 \(IOAPIC_REDTBL+0x0a\)) 34.314 Tj
+0 -40.5818 Td
+(5878 #define IOAPIC_REDTBL6 \(IOAPIC_REDTBL+0x0c\)) 34.314 Tj
+0 -41.8909 Td
+(5879 #define IOAPIC_REDTBL7 \(IOAPIC_REDTBL+0x0e\)) 34.314 Tj
+0 -43.2 Td
+(5880 #define IOAPIC_REDTBL8 \(IOAPIC_REDTBL+0x10\)) 34.314 Tj
+0 -44.5091 Td
+(5881 #define IOAPIC_REDTBL9 \(IOAPIC_REDTBL+0x12\)) 34.314 Tj
+0 -45.8182 Td
+(5882 #define IOAPIC_REDTBL10 \(IOAPIC_REDTBL+0x14\)) 34.314 Tj
+0 -47.1272 Td
+(5883 #define IOAPIC_REDTBL11 \(IOAPIC_REDTBL+0x16\)) 34.314 Tj
+0 -48.4363 Td
+(5884 #define IOAPIC_REDTBL12 \(IOAPIC_REDTBL+0x18\)) 34.314 Tj
+0 -49.7454 Td
+(5885 #define IOAPIC_REDTBL13 \(IOAPIC_REDTBL+0x1a\)) 34.314 Tj
+0 -51.0545 Td
+(5886 #define IOAPIC_REDTBL14 \(IOAPIC_REDTBL+0x1c\)) 34.314 Tj
+0 -52.3636 Td
+(5887 #define IOAPIC_REDTBL15 \(IOAPIC_REDTBL+0x1e\)) 34.314 Tj
+0 -53.6727 Td
+(5888 #define IOAPIC_REDTBL16 \(IOAPIC_REDTBL+0x20\)) 34.314 Tj
+0 -54.9818 Td
+(5889 #define IOAPIC_REDTBL17 \(IOAPIC_REDTBL+0x22\)) 34.314 Tj
+0 -56.2909 Td
+(5890 #define IOAPIC_REDTBL18 \(IOAPIC_REDTBL+0x24\)) 34.314 Tj
+0 -57.6 Td
+(5891 #define IOAPIC_REDTBL19 \(IOAPIC_REDTBL+0x26\)) 34.314 Tj
+0 -58.9091 Td
+(5892 #define IOAPIC_REDTBL20 \(IOAPIC_REDTBL+0x28\)) 34.314 Tj
+0 -60.2181 Td
+(5893 #define IOAPIC_REDTBL21 \(IOAPIC_REDTBL+0x2a\)) 34.314 Tj
+0 -61.5272 Td
+(5894 #define IOAPIC_REDTBL22 \(IOAPIC_REDTBL+0x2c\)) 34.314 Tj
+0 -62.8363 Td
+(5895 #define IOAPIC_REDTBL23 \(IOAPIC_REDTBL+0x2e\)) 34.314 Tj
+0 -64.1454 Td
+(5896 ) 3.01 Tj
+0 -65.4545 Td
+(5897 // Fields in the IO APIC's redirection table entries) 34.314 Tj
+0 -66.7636 Td
+(5898 #define IOART_DEST APIC_ID_MASK // broadcast addr: all APICs) 43.946 Tj
+0 -68.0727 Td
+(5899 ) 3.01 Tj
+0 -72 Td
+(Sheet 58) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 66 66
+%%BeginPageSetup
+%%PageOrientation: Landscape
+__tumble pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/ioapic.h Page 2) 23.478 Tj
+0 -3.92728 Td
+(5900 #define IOART_RESV 0x00fe0000 // reserved) 33.712 Tj
+0 -5.23637 Td
+(5901 ) 3.01 Tj
+0 -6.54546 Td
+(5902 #define IOART_INTMASK 0x00010000 // R/W: INTerrupt mask) 40.334 Tj
+0 -7.85455 Td
+(5903 #define IOART_INTMCLR 0x00000000 // clear, allow INTs) 42.742 Tj
+0 -9.16364 Td
+(5904 #define IOART_INTMSET 0x00010000 // set, inhibit INTs) 42.742 Tj
+0 -10.4727 Td
+(5905 ) 3.01 Tj
+0 -11.7818 Td
+(5906 #define IOART_TRGRMOD 0x00008000 // R/W: trigger mode) 39.13 Tj
+0 -13.0909 Td
+(5907 #define IOART_TRGREDG 0x00000000 // edge) 34.916 Tj
+0 -14.4 Td
+(5908 #define IOART_TRGRLVL 0x00008000 // level) 35.518 Tj
+0 -15.7091 Td
+(5909 ) 3.01 Tj
+0 -17.0182 Td
+(5910 #define IOART_REM_IRR 0x00004000 // RO: remote IRR) 37.324 Tj
+0 -18.3273 Td
+(5911 ) 3.01 Tj
+0 -19.6364 Td
+(5912 #define IOART_INTPOL 0x00002000 // R/W: INT input pin polarity) 45.15 Tj
+0 -20.9455 Td
+(5913 #define IOART_INTAHI 0x00000000 // active high) 38.528 Tj
+0 -22.2545 Td
+(5914 #define IOART_INTALO 0x00002000 // active low) 37.926 Tj
+0 -23.5636 Td
+(5915 ) 3.01 Tj
+0 -24.8727 Td
+(5916 #define IOART_DELIVS 0x00001000 // RO: delivery status) 40.334 Tj
+0 -26.1818 Td
+(5917 ) 3.01 Tj
+0 -27.4909 Td
+(5918 #define IOART_DESTMOD 0x00000800 // R/W: destination mode) 41.538 Tj
+0 -28.8 Td
+(5919 #define IOART_DESTPHY 0x00000000 // physical) 36.722 Tj
+0 -30.1091 Td
+(5920 #define IOART_DESTLOG 0x00000800 // logical) 36.12 Tj
+0 -31.4182 Td
+(5921 ) 3.01 Tj
+0 -32.7273 Td
+(5922 #define IOART_DELMOD 0x00000700 // R/W: delivery mode) 39.732 Tj
+0 -34.0364 Td
+(5923 #define IOART_DELFIXED 0x00000000 // fixed) 35.518 Tj
+0 -35.3454 Td
+(5924 #define IOART_DELLOPRI 0x00000100 // lowest priority) 41.538 Tj
+0 -36.6545 Td
+(5925 #define IOART_DELSMI 0x00000200 // System Management INT) 45.15 Tj
+0 -37.9636 Td
+(5926 #define IOART_DELRSV1 0x00000300 // reserved) 37.324 Tj
+0 -39.2727 Td
+(5927 #define IOART_DELNMI 0x00000400 // NMI signal) 38.528 Tj
+0 -40.5818 Td
+(5928 #define IOART_DELINIT 0x00000500 // INIT signal) 39.13 Tj
+0 -41.8909 Td
+(5929 #define IOART_DELRSV2 0x00000600 // reserved) 37.324 Tj
+0 -43.2 Td
+(5930 #define IOART_DELEXINT 0x00000700 // External INTerrupt) 43.344 Tj
+0 -44.5091 Td
+(5931 ) 3.01 Tj
+0 -45.8182 Td
+(5932 #define IOART_INTVEC 0x000000ff // R/W: INTerrupt vector field) 45.15 Tj
+0 -47.1272 Td
+(5933 ) 3.01 Tj
+0 -48.4363 Td
+(5934 // Fields in VER) 12.642 Tj
+0 -49.7454 Td
+(5935 #define IOART_VER_VERSION 0x000000ff) 28.294 Tj
+0 -51.0545 Td
+(5936 #define IOART_VER_MAXREDIR 0x00ff0000) 28.294 Tj
+0 -52.3636 Td
+(5937 #define MAXREDIRSHIFT 16) 23.478 Tj
+0 -53.6727 Td
+(5938 ) 3.01 Tj
+0 -54.9818 Td
+(5939 ) 3.01 Tj
+0 -56.2909 Td
+(5940 ) 3.01 Tj
+0 -57.6 Td
+(5941 ) 3.01 Tj
+0 -58.9091 Td
+(5942 ) 3.01 Tj
+0 -60.2181 Td
+(5943 ) 3.01 Tj
+0 -61.5272 Td
+(5944 ) 3.01 Tj
+0 -62.8363 Td
+(5945 ) 3.01 Tj
+0 -64.1454 Td
+(5946 ) 3.01 Tj
+0 -65.4545 Td
+(5947 ) 3.01 Tj
+0 -66.7636 Td
+(5948 ) 3.01 Tj
+0 -68.0727 Td
+(5949 ) 3.01 Tj
+0 -72 Td
+(Sheet 59) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/lapic.c Page 1) 22.876 Tj
+0 -3.92728 Td
+(5950 #include "types.h") 13.846 Tj
+0 -5.23637 Td
+(5951 #include "mp.h") 12.04 Tj
+0 -6.54546 Td
+(5952 #include "defs.h") 13.244 Tj
+0 -7.85455 Td
+(5953 #include "param.h") 13.846 Tj
+0 -9.16364 Td
+(5954 #include "x86.h") 12.642 Tj
+0 -10.4727 Td
+(5955 #include "traps.h") 13.846 Tj
+0 -11.7818 Td
+(5956 #include "mmu.h") 12.642 Tj
+0 -13.0909 Td
+(5957 #include "proc.h") 13.244 Tj
+0 -14.4 Td
+(5958 ) 3.01 Tj
+0 -15.7091 Td
+(5959 enum { // Local APIC registers) 21.672 Tj
+0 -17.0182 Td
+(5960 LAPIC_ID = 0x0020, // ID) 20.468 Tj
+0 -18.3273 Td
+(5961 LAPIC_VER = 0x0030, // Version) 23.478 Tj
+0 -19.6364 Td
+(5962 LAPIC_TPR = 0x0080, // Task Priority) 27.09 Tj
+0 -20.9455 Td
+(5963 LAPIC_APR = 0x0090, // Arbitration Priority) 31.304 Tj
+0 -22.2545 Td
+(5964 LAPIC_PPR = 0x00A0, // Processor Priority) 30.1 Tj
+0 -23.5636 Td
+(5965 LAPIC_EOI = 0x00B0, // EOI) 21.07 Tj
+0 -24.8727 Td
+(5966 LAPIC_LDR = 0x00D0, // Logical Destination) 30.702 Tj
+0 -26.1818 Td
+(5967 LAPIC_DFR = 0x00E0, // Destination Format) 30.1 Tj
+0 -27.4909 Td
+(5968 LAPIC_SVR = 0x00F0, // Spurious Interrupt Vector) 34.314 Tj
+0 -28.8 Td
+(5969 LAPIC_ISR = 0x0100, // Interrupt Status \(8 registers\)) 37.324 Tj
+0 -30.1091 Td
+(5970 LAPIC_TMR = 0x0180, // Trigger Mode \(8 registers\)) 34.916 Tj
+0 -31.4182 Td
+(5971 LAPIC_IRR = 0x0200, // Interrupt Request \(8 registers\)) 37.926 Tj
+0 -32.7273 Td
+(5972 LAPIC_ESR = 0x0280, // Error Status) 26.488 Tj
+0 -34.0364 Td
+(5973 LAPIC_ICRLO = 0x0300, // Interrupt Command) 29.498 Tj
+0 -35.3454 Td
+(5974 LAPIC_ICRHI = 0x0310, // Interrupt Command [63:32]) 34.314 Tj
+0 -36.6545 Td
+(5975 LAPIC_TIMER = 0x0320, // Local Vector Table 0 \(TIMER\)) 36.12 Tj
+0 -37.9636 Td
+(5976 LAPIC_PCINT = 0x0340, // Performance Counter LVT) 33.11 Tj
+0 -39.2727 Td
+(5977 LAPIC_LINT0 = 0x0350, // Local Vector Table 1 \(LINT0\)) 36.12 Tj
+0 -40.5818 Td
+(5978 LAPIC_LINT1 = 0x0360, // Local Vector Table 2 \(LINT1\)) 36.12 Tj
+0 -41.8909 Td
+(5979 LAPIC_ERROR = 0x0370, // Local Vector Table 3 \(ERROR\)) 36.12 Tj
+0 -43.2 Td
+(5980 LAPIC_TICR = 0x0380, // Timer Initial Count) 30.702 Tj
+0 -44.5091 Td
+(5981 LAPIC_TCCR = 0x0390, // Timer Current Count) 30.702 Tj
+0 -45.8182 Td
+(5982 LAPIC_TDCR = 0x03E0, // Timer Divide Configuration) 34.916 Tj
+0 -47.1272 Td
+(5983 };) 4.214 Tj
+0 -48.4363 Td
+(5984 ) 3.01 Tj
+0 -49.7454 Td
+(5985 enum { // LAPIC_SVR) 15.05 Tj
+0 -51.0545 Td
+(5986 LAPIC_ENABLE = 0x00000100, // Unit Enable) 30.702 Tj
+0 -52.3636 Td
+(5987 LAPIC_FOCUS = 0x00000200, // Focus Processor Checking Disable) 43.344 Tj
+0 -53.6727 Td
+(5988 };) 4.214 Tj
+0 -54.9818 Td
+(5989 ) 3.01 Tj
+0 -56.2909 Td
+(5990 ) 3.01 Tj
+0 -57.6 Td
+(5991 ) 3.01 Tj
+0 -58.9091 Td
+(5992 ) 3.01 Tj
+0 -60.2181 Td
+(5993 ) 3.01 Tj
+0 -61.5272 Td
+(5994 ) 3.01 Tj
+0 -62.8363 Td
+(5995 ) 3.01 Tj
+0 -64.1454 Td
+(5996 ) 3.01 Tj
+0 -65.4545 Td
+(5997 ) 3.01 Tj
+0 -66.7636 Td
+(5998 ) 3.01 Tj
+0 -68.0727 Td
+(5999 ) 3.01 Tj
+0 -72 Td
+(Sheet 59) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 67 67
+%%BeginPageSetup
+%%PageOrientation: Landscape
+pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/lapic.c Page 2) 22.876 Tj
+0 -3.92728 Td
+(6000 enum { // LAPIC_ICRLO) 16.254 Tj
+0 -5.23637 Td
+(6001 // [14] IPI Trigger Mode Level \(RW\)) 25.284 Tj
+0 -6.54546 Td
+(6002 LAPIC_DEASSERT = 0x00000000, // Deassert level-sensitive interrupt) 44.548 Tj
+0 -7.85455 Td
+(6003 LAPIC_ASSERT = 0x00004000, // Assert level-sensitive interrupt) 43.344 Tj
+0 -9.16364 Td
+(6004 ) 3.01 Tj
+0 -10.4727 Td
+(6005 // [17:16] Remote Read Status) 21.672 Tj
+0 -11.7818 Td
+(6006 LAPIC_INVALID = 0x00000000, // Invalid) 28.294 Tj
+0 -13.0909 Td
+(6007 LAPIC_WAIT = 0x00010000, // In-Progress) 30.702 Tj
+0 -14.4 Td
+(6008 LAPIC_VALID = 0x00020000, // Valid) 27.09 Tj
+0 -15.7091 Td
+(6009 ) 3.01 Tj
+0 -17.0182 Td
+(6010 // [19:18] Destination Shorthand) 23.478 Tj
+0 -18.3273 Td
+(6011 LAPIC_FIELD = 0x00000000, // No shorthand) 31.304 Tj
+0 -19.6364 Td
+(6012 LAPIC_SELF = 0x00040000, // Self is single destination) 39.732 Tj
+0 -20.9455 Td
+(6013 LAPIC_ALLINC = 0x00080000, // All including self) 34.916 Tj
+0 -22.2545 Td
+(6014 LAPIC_ALLEXC = 0x000C0000, // All Excluding self) 34.916 Tj
+0 -23.5636 Td
+(6015 };) 4.214 Tj
+0 -24.8727 Td
+(6016 ) 3.01 Tj
+0 -26.1818 Td
+(6017 enum { // LAPIC_ESR) 15.05 Tj
+0 -27.4909 Td
+(6018 LAPIC_SENDCS = 0x00000001, // Send CS Error) 33.11 Tj
+0 -28.8 Td
+(6019 LAPIC_RCVCS = 0x00000002, // Receive CS Error) 34.916 Tj
+0 -30.1091 Td
+(6020 LAPIC_SENDACCEPT = 0x00000004, // Send Accept Error) 35.518 Tj
+0 -31.4182 Td
+(6021 LAPIC_RCVACCEPT = 0x00000008, // Receive Accept Error) 37.324 Tj
+0 -32.7273 Td
+(6022 LAPIC_SENDVECTOR = 0x00000020, // Send Illegal Vector) 36.722 Tj
+0 -34.0364 Td
+(6023 LAPIC_RCVVECTOR = 0x00000040, // Receive Illegal Vector) 38.528 Tj
+0 -35.3454 Td
+(6024 LAPIC_REGISTER = 0x00000080, // Illegal Register Address) 39.732 Tj
+0 -36.6545 Td
+(6025 };) 4.214 Tj
+0 -37.9636 Td
+(6026 ) 3.01 Tj
+0 -39.2727 Td
+(6027 enum { // LAPIC_TIMER) 16.254 Tj
+0 -40.5818 Td
+(6028 // [17] Timer Mode \(RW\)) 18.06 Tj
+0 -41.8909 Td
+(6029 LAPIC_ONESHOT = 0x00000000, // One-shot) 28.896 Tj
+0 -43.2 Td
+(6030 LAPIC_PERIODIC = 0x00020000, // Periodic) 28.896 Tj
+0 -44.5091 Td
+(6031 ) 3.01 Tj
+0 -45.8182 Td
+(6032 // [19:18] Timer Base \(RW\)) 19.866 Tj
+0 -47.1272 Td
+(6033 LAPIC_CLKIN = 0x00000000, // use CLKIN as input) 34.916 Tj
+0 -48.4363 Td
+(6034 LAPIC_TMBASE = 0x00040000, // use TMBASE) 30.1 Tj
+0 -49.7454 Td
+(6035 LAPIC_DIVIDER = 0x00080000, // use output of the divider) 39.13 Tj
+0 -51.0545 Td
+(6036 };) 4.214 Tj
+0 -52.3636 Td
+(6037 ) 3.01 Tj
+0 -53.6727 Td
+(6038 enum { // LAPIC_TDCR) 15.652 Tj
+0 -54.9818 Td
+(6039 LAPIC_X2 = 0x00000000, // divide by 2) 30.702 Tj
+0 -56.2909 Td
+(6040 LAPIC_X4 = 0x00000001, // divide by 4) 30.702 Tj
+0 -57.6 Td
+(6041 LAPIC_X8 = 0x00000002, // divide by 8) 30.702 Tj
+0 -58.9091 Td
+(6042 LAPIC_X16 = 0x00000003, // divide by 16) 31.304 Tj
+0 -60.2181 Td
+(6043 LAPIC_X32 = 0x00000008, // divide by 32) 31.304 Tj
+0 -61.5272 Td
+(6044 LAPIC_X64 = 0x00000009, // divide by 64) 31.304 Tj
+0 -62.8363 Td
+(6045 LAPIC_X128 = 0x0000000A, // divide by 128) 31.906 Tj
+0 -64.1454 Td
+(6046 LAPIC_X1 = 0x0000000B, // divide by 1) 30.702 Tj
+0 -65.4545 Td
+(6047 };) 4.214 Tj
+0 -66.7636 Td
+(6048 ) 3.01 Tj
+0 -68.0727 Td
+(6049 ) 3.01 Tj
+0 -72 Td
+(Sheet 60) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/lapic.c Page 3) 22.876 Tj
+0 -3.92728 Td
+(6050 uint *lapicaddr;) 12.642 Tj
+0 -5.23637 Td
+(6051 ) 3.01 Tj
+0 -6.54546 Td
+(6052 static int) 9.03 Tj
+0 -7.85455 Td
+(6053 lapic_read\(int r\)) 13.244 Tj
+0 -9.16364 Td
+(6054 {) 3.612 Tj
+0 -10.4727 Td
+(6055 return *\(lapicaddr+\(r/sizeof\(*lapicaddr\)\)\);) 30.1 Tj
+0 -11.7818 Td
+(6056 }) 3.612 Tj
+0 -13.0909 Td
+(6057 ) 3.01 Tj
+0 -14.4 Td
+(6058 static void) 9.632 Tj
+0 -15.7091 Td
+(6059 lapic_write\(int r, int data\)) 19.866 Tj
+0 -17.0182 Td
+(6060 {) 3.612 Tj
+0 -18.3273 Td
+(6061 *\(lapicaddr+\(r/sizeof\(*lapicaddr\)\)\) = data;) 30.1 Tj
+0 -19.6364 Td
+(6062 }) 3.612 Tj
+0 -20.9455 Td
+(6063 ) 3.01 Tj
+0 -22.2545 Td
+(6064 ) 3.01 Tj
+0 -23.5636 Td
+(6065 void) 5.418 Tj
+0 -24.8727 Td
+(6066 lapic_timerinit\(void\)) 15.652 Tj
+0 -26.1818 Td
+(6067 {) 3.612 Tj
+0 -27.4909 Td
+(6068 if\(!lapicaddr\)) 12.642 Tj
+0 -28.8 Td
+(6069 return;) 9.632 Tj
+0 -30.1091 Td
+(6070 ) 3.01 Tj
+0 -31.4182 Td
+(6071 lapic_write\(LAPIC_TDCR, LAPIC_X1\);) 24.682 Tj
+0 -32.7273 Td
+(6072 lapic_write\(LAPIC_TIMER, LAPIC_CLKIN | LAPIC_PERIODIC |) 37.324 Tj
+0 -34.0364 Td
+(6073 ) 3.01 Tj
+8.42796 -34.0364 Td
+(\(IRQ_OFFSET + IRQ_TIMER\)\);) 15.652 Tj
+0 -35.3454 Td
+(6074 lapic_write\(LAPIC_TCCR, 10000000\);) 24.682 Tj
+0 -36.6545 Td
+(6075 lapic_write\(LAPIC_TICR, 10000000\);) 24.682 Tj
+0 -37.9636 Td
+(6076 }) 3.612 Tj
+0 -39.2727 Td
+(6077 ) 3.01 Tj
+0 -40.5818 Td
+(6078 void) 5.418 Tj
+0 -41.8909 Td
+(6079 lapic_timerintr\(void\)) 15.652 Tj
+0 -43.2 Td
+(6080 {) 3.612 Tj
+0 -44.5091 Td
+(6081 if\(lapicaddr\)) 12.04 Tj
+0 -45.8182 Td
+(6082 lapic_write\(LAPIC_EOI, 0\);) 21.07 Tj
+0 -47.1272 Td
+(6083 }) 3.612 Tj
+0 -48.4363 Td
+(6084 ) 3.01 Tj
+0 -49.7454 Td
+(6085 void) 5.418 Tj
+0 -51.0545 Td
+(6086 lapic_init\(int c\)) 13.244 Tj
+0 -52.3636 Td
+(6087 {) 3.612 Tj
+0 -53.6727 Td
+(6088 uint r, lvt;) 11.438 Tj
+0 -54.9818 Td
+(6089 ) 3.01 Tj
+0 -56.2909 Td
+(6090 if\(!lapicaddr\)) 12.642 Tj
+0 -57.6 Td
+(6091 return;) 9.632 Tj
+0 -58.9091 Td
+(6092 ) 3.01 Tj
+0 -60.2181 Td
+(6093 lapic_write\(LAPIC_DFR, 0xFFFFFFFF\); // Set dst format register) 43.344 Tj
+0 -61.5272 Td
+(6094 r = \(lapic_read\(LAPIC_ID\)>>24\) & 0xFF; // Read APIC ID) 36.722 Tj
+0 -62.8363 Td
+(6095 lapic_write\(LAPIC_LDR, \(1<<r\)<<24\); // Set logical dst register to r) 46.956 Tj
+0 -64.1454 Td
+(6096 lapic_write\(LAPIC_TPR, 0xFF\); // No interrupts for now) 42.14 Tj
+0 -65.4545 Td
+(6097 ) 3.01 Tj
+0 -66.7636 Td
+(6098 // Enable APIC) 12.642 Tj
+0 -68.0727 Td
+(6099 lapic_write\(LAPIC_SVR, LAPIC_ENABLE|\(IRQ_OFFSET+IRQ_SPURIOUS\)\);) 42.14 Tj
+0 -72 Td
+(Sheet 60) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 68 68
+%%BeginPageSetup
+%%PageOrientation: Landscape
+__tumble pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/lapic.c Page 4) 22.876 Tj
+0 -3.92728 Td
+(6100 // In virtual wire mode, set up the LINT0 and LINT1 as follows:) 42.14 Tj
+0 -5.23637 Td
+(6101 lapic_write\(LAPIC_LINT0, APIC_IMASK | APIC_EXTINT\);) 34.916 Tj
+0 -6.54546 Td
+(6102 lapic_write\(LAPIC_LINT1, APIC_IMASK | APIC_NMI\);) 33.11 Tj
+0 -7.85455 Td
+(6103 ) 3.01 Tj
+0 -9.16364 Td
+(6104 lapic_write\(LAPIC_EOI, 0\); // Ack any outstanding interrupts.) 40.936 Tj
+0 -10.4727 Td
+(6105 ) 3.01 Tj
+0 -11.7818 Td
+(6106 lvt = \(lapic_read\(LAPIC_VER\)>>16\) & 0xFF;) 28.896 Tj
+0 -13.0909 Td
+(6107 if\(lvt >= 4\)) 11.438 Tj
+0 -14.4 Td
+(6108 lapic_write\(LAPIC_PCINT, APIC_IMASK\);) 27.692 Tj
+0 -15.7091 Td
+(6109 lapic_write\(LAPIC_ERROR, IRQ_OFFSET+IRQ_ERROR\);) 32.508 Tj
+0 -17.0182 Td
+(6110 lapic_write\(LAPIC_ESR, 0\);) 19.866 Tj
+0 -18.3273 Td
+(6111 lapic_read\(LAPIC_ESR\);) 17.458 Tj
+0 -19.6364 Td
+(6112 ) 3.01 Tj
+0 -20.9455 Td
+(6113 // Issue an INIT Level De-Assert to synchronise arbitration ID's.) 43.344 Tj
+0 -22.2545 Td
+(6114 lapic_write\(LAPIC_ICRHI, 0\);) 21.07 Tj
+0 -23.5636 Td
+(6115 lapic_write\(LAPIC_ICRLO, LAPIC_ALLINC|APIC_LEVEL|) 33.712 Tj
+0 -24.8727 Td
+(6116 LAPIC_DEASSERT|APIC_INIT\);) 34.916 Tj
+0 -26.1818 Td
+(6117 while\(lapic_read\(LAPIC_ICRLO\) & APIC_DELIVS\)) 30.702 Tj
+0 -27.4909 Td
+(6118 ;) 6.02 Tj
+0 -28.8 Td
+(6119 }) 3.612 Tj
+0 -30.1091 Td
+(6120 ) 3.01 Tj
+0 -31.4182 Td
+(6121 void) 5.418 Tj
+0 -32.7273 Td
+(6122 lapic_enableintr\(void\)) 16.254 Tj
+0 -34.0364 Td
+(6123 {) 3.612 Tj
+0 -35.3454 Td
+(6124 if\(lapicaddr\)) 12.04 Tj
+0 -36.6545 Td
+(6125 lapic_write\(LAPIC_TPR, 0\);) 21.07 Tj
+0 -37.9636 Td
+(6126 }) 3.612 Tj
+0 -39.2727 Td
+(6127 ) 3.01 Tj
+0 -40.5818 Td
+(6128 void) 5.418 Tj
+0 -41.8909 Td
+(6129 lapic_disableintr\(void\)) 16.856 Tj
+0 -43.2 Td
+(6130 {) 3.612 Tj
+0 -44.5091 Td
+(6131 if\(lapicaddr\)) 12.04 Tj
+0 -45.8182 Td
+(6132 lapic_write\(LAPIC_TPR, 0xFF\);) 22.876 Tj
+0 -47.1272 Td
+(6133 }) 3.612 Tj
+0 -48.4363 Td
+(6134 ) 3.01 Tj
+0 -49.7454 Td
+(6135 void) 5.418 Tj
+0 -51.0545 Td
+(6136 lapic_eoi\(void\)) 12.04 Tj
+0 -52.3636 Td
+(6137 {) 3.612 Tj
+0 -53.6727 Td
+(6138 if\(lapicaddr\)) 12.04 Tj
+0 -54.9818 Td
+(6139 lapic_write\(LAPIC_EOI, 0\);) 21.07 Tj
+0 -56.2909 Td
+(6140 }) 3.612 Tj
+0 -57.6 Td
+(6141 ) 3.01 Tj
+0 -58.9091 Td
+(6142 ) 3.01 Tj
+0 -60.2181 Td
+(6143 ) 3.01 Tj
+0 -61.5272 Td
+(6144 ) 3.01 Tj
+0 -62.8363 Td
+(6145 ) 3.01 Tj
+0 -64.1454 Td
+(6146 ) 3.01 Tj
+0 -65.4545 Td
+(6147 ) 3.01 Tj
+0 -66.7636 Td
+(6148 ) 3.01 Tj
+0 -68.0727 Td
+(6149 ) 3.01 Tj
+0 -72 Td
+(Sheet 61) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/lapic.c Page 5) 22.876 Tj
+0 -3.92728 Td
+(6150 int) 4.816 Tj
+0 -5.23637 Td
+(6151 cpu\(void\)) 8.428 Tj
+0 -6.54546 Td
+(6152 {) 3.612 Tj
+0 -7.85455 Td
+(6153 int x;) 7.826 Tj
+0 -9.16364 Td
+(6154 if\(lapicaddr\)) 12.04 Tj
+0 -10.4727 Td
+(6155 x = \(lapic_read\(LAPIC_ID\)>>24\) & 0xFF;) 28.294 Tj
+0 -11.7818 Td
+(6156 else) 6.622 Tj
+0 -13.0909 Td
+(6157 x = 0;) 9.03 Tj
+0 -14.4 Td
+(6158 return x;) 9.632 Tj
+0 -15.7091 Td
+(6159 }) 3.612 Tj
+0 -17.0182 Td
+(6160 ) 3.01 Tj
+0 -18.3273 Td
+(6161 void) 5.418 Tj
+0 -19.6364 Td
+(6162 lapic_startap\(uchar apicid, int v\)) 23.478 Tj
+0 -20.9455 Td
+(6163 {) 3.612 Tj
+0 -22.2545 Td
+(6164 int crhi, i;) 11.438 Tj
+0 -23.5636 Td
+(6165 volatile int j = 0;) 15.652 Tj
+0 -24.8727 Td
+(6166 ) 3.01 Tj
+0 -26.1818 Td
+(6167 crhi = apicid<<24;) 15.05 Tj
+0 -27.4909 Td
+(6168 lapic_write\(LAPIC_ICRHI, crhi\);) 22.876 Tj
+0 -28.8 Td
+(6169 lapic_write\(LAPIC_ICRLO, LAPIC_FIELD|APIC_LEVEL|) 33.11 Tj
+0 -30.1091 Td
+(6170 LAPIC_ASSERT|APIC_INIT\);) 33.712 Tj
+0 -31.4182 Td
+(6171 ) 3.01 Tj
+0 -32.7273 Td
+(6172 while\(j++ < 10000\) {;}) 17.458 Tj
+0 -34.0364 Td
+(6173 lapic_write\(LAPIC_ICRLO, LAPIC_FIELD|APIC_LEVEL|) 33.11 Tj
+0 -35.3454 Td
+(6174 LAPIC_DEASSERT|APIC_INIT\);) 34.916 Tj
+0 -36.6545 Td
+(6175 ) 3.01 Tj
+0 -37.9636 Td
+(6176 while\(j++ < 1000000\) {;}) 18.662 Tj
+0 -39.2727 Td
+(6177 ) 3.01 Tj
+0 -40.5818 Td
+(6178 // in p9 code, this was i < 2, which is what the spec says on page B-3) 46.354 Tj
+0 -41.8909 Td
+(6179 for\(i = 0; i < 1; i++\){) 18.06 Tj
+0 -43.2 Td
+(6180 lapic_write\(LAPIC_ICRHI, crhi\);) 24.08 Tj
+0 -44.5091 Td
+(6181 lapic_write\(LAPIC_ICRLO, LAPIC_FIELD|APIC_EDGE|APIC_STARTUP|\(v/4096\)\);) 47.558 Tj
+0 -45.8182 Td
+(6182 while\(j++ < 100000\) {;}) 19.264 Tj
+0 -47.1272 Td
+(6183 }) 4.816 Tj
+0 -48.4363 Td
+(6184 }) 3.612 Tj
+0 -49.7454 Td
+(6185 ) 3.01 Tj
+0 -51.0545 Td
+(6186 ) 3.01 Tj
+0 -52.3636 Td
+(6187 ) 3.01 Tj
+0 -53.6727 Td
+(6188 ) 3.01 Tj
+0 -54.9818 Td
+(6189 ) 3.01 Tj
+0 -56.2909 Td
+(6190 ) 3.01 Tj
+0 -57.6 Td
+(6191 ) 3.01 Tj
+0 -58.9091 Td
+(6192 ) 3.01 Tj
+0 -60.2181 Td
+(6193 ) 3.01 Tj
+0 -61.5272 Td
+(6194 ) 3.01 Tj
+0 -62.8363 Td
+(6195 ) 3.01 Tj
+0 -64.1454 Td
+(6196 ) 3.01 Tj
+0 -65.4545 Td
+(6197 ) 3.01 Tj
+0 -66.7636 Td
+(6198 ) 3.01 Tj
+0 -68.0727 Td
+(6199 ) 3.01 Tj
+0 -72 Td
+(Sheet 61) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 69 69
+%%BeginPageSetup
+%%PageOrientation: Landscape
+pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/ioapic.c Page 1) 23.478 Tj
+0 -3.92728 Td
+(6200 #include "types.h") 13.846 Tj
+0 -5.23637 Td
+(6201 #include "mp.h") 12.04 Tj
+0 -6.54546 Td
+(6202 #include "defs.h") 13.244 Tj
+0 -7.85455 Td
+(6203 #include "x86.h") 12.642 Tj
+0 -9.16364 Td
+(6204 #include "traps.h") 13.846 Tj
+0 -10.4727 Td
+(6205 #include "ioapic.h") 14.448 Tj
+0 -11.7818 Td
+(6206 ) 3.01 Tj
+0 -13.0909 Td
+(6207 struct ioapic {) 12.04 Tj
+0 -14.4 Td
+(6208 uint ioregsel; uint p01; uint p02; uint p03;) 31.304 Tj
+0 -15.7091 Td
+(6209 uint iowin; uint p11; uint p12; uint p13;) 31.304 Tj
+0 -17.0182 Td
+(6210 };) 4.214 Tj
+0 -18.3273 Td
+(6211 ) 3.01 Tj
+0 -19.6364 Td
+(6212 ) 3.01 Tj
+0 -20.9455 Td
+(6213 #define IOAPIC_REDTBL_LO\(i\) \(IOAPIC_REDTBL + \(i\) * 2\)) 35.518 Tj
+0 -22.2545 Td
+(6214 #define IOAPIC_REDTBL_HI\(i\) \(IOAPIC_REDTBL_LO\(i\) + 1\)) 35.518 Tj
+0 -23.5636 Td
+(6215 ) 3.01 Tj
+0 -24.8727 Td
+(6216 static uint) 9.632 Tj
+0 -26.1818 Td
+(6217 ioapic_read\(struct ioapic *io, int reg\)) 26.488 Tj
+0 -27.4909 Td
+(6218 {) 3.612 Tj
+0 -28.8 Td
+(6219 io->ioregsel = reg;) 15.652 Tj
+0 -30.1091 Td
+(6220 return io->iowin;) 14.448 Tj
+0 -31.4182 Td
+(6221 }) 3.612 Tj
+0 -32.7273 Td
+(6222 ) 3.01 Tj
+0 -34.0364 Td
+(6223 static void) 9.632 Tj
+0 -35.3454 Td
+(6224 ioapic_write\(struct ioapic *io, int reg, uint val\)) 33.11 Tj
+0 -36.6545 Td
+(6225 {) 3.612 Tj
+0 -37.9636 Td
+(6226 io->ioregsel = reg;) 15.652 Tj
+0 -39.2727 Td
+(6227 io->iowin = val;) 13.846 Tj
+0 -40.5818 Td
+(6228 }) 3.612 Tj
+0 -41.8909 Td
+(6229 ) 3.01 Tj
+0 -43.2 Td
+(6230 void) 5.418 Tj
+0 -44.5091 Td
+(6231 ioapic_init\(void\)) 13.244 Tj
+0 -45.8182 Td
+(6232 {) 3.612 Tj
+0 -47.1272 Td
+(6233 struct ioapic *io;) 15.05 Tj
+0 -48.4363 Td
+(6234 uint l, h;) 10.234 Tj
+0 -49.7454 Td
+(6235 int nintr;) 10.234 Tj
+0 -51.0545 Td
+(6236 uchar id;) 9.632 Tj
+0 -52.3636 Td
+(6237 int i;) 7.826 Tj
+0 -53.6727 Td
+(6238 ) 3.01 Tj
+0 -54.9818 Td
+(6239 if\(!ismp\)) 9.632 Tj
+0 -56.2909 Td
+(6240 return;) 9.632 Tj
+0 -57.6 Td
+(6241 ) 3.01 Tj
+0 -58.9091 Td
+(6242 io = \(struct ioapic*\) IO_APIC_BASE;) 25.284 Tj
+0 -60.2181 Td
+(6243 l = ioapic_read\(io, IOAPIC_VER\);) 23.478 Tj
+0 -61.5272 Td
+(6244 nintr = \(\(l & IOART_VER_MAXREDIR\) >> MAXREDIRSHIFT\) + 1;) 38.528 Tj
+0 -62.8363 Td
+(6245 id = ioapic_read\(io, IOAPIC_ID\) >> APIC_ID_SHIFT;) 33.712 Tj
+0 -64.1454 Td
+(6246 if\(id != ioapic_id\)) 15.652 Tj
+0 -65.4545 Td
+(6247 cprintf\("ioapic_init: id isn't equal to ioapic_id; not a MP\\n"\);) 43.946 Tj
+0 -66.7636 Td
+(6248 for\(i = 0; i < nintr; i++\) {) 21.07 Tj
+0 -68.0727 Td
+(6249 // active-hi and edge-triggered for ISA interrupts) 35.518 Tj
+0 -72 Td
+(Sheet 62) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/ioapic.c Page 2) 23.478 Tj
+0 -3.92728 Td
+(6250 // Assume that pin 0 on the first I/O APIC is an ExtINT pin.) 41.538 Tj
+0 -5.23637 Td
+(6251 // Assume that pins 1-15 are ISA interrupts) 31.304 Tj
+0 -6.54546 Td
+(6252 l = ioapic_read\(io, IOAPIC_REDTBL_LO\(i\)\);) 30.1 Tj
+0 -7.85455 Td
+(6253 l = l & ~IOART_INTMASK; // allow INTs) 28.294 Tj
+0 -9.16364 Td
+(6254 l |= IOART_INTMSET;) 16.856 Tj
+0 -10.4727 Td
+(6255 l = l & ~IOART_INTPOL; // active hi) 27.692 Tj
+0 -11.7818 Td
+(6256 l = l & ~IOART_TRGRMOD; // edgee triggered) 31.304 Tj
+0 -13.0909 Td
+(6257 l = l & ~IOART_DELMOD; // fixed) 25.284 Tj
+0 -14.4 Td
+(6258 l = l & ~IOART_DESTMOD; // physical mode) 30.1 Tj
+0 -15.7091 Td
+(6259 l = l | \(IRQ_OFFSET + i\); // vector) 26.488 Tj
+0 -17.0182 Td
+(6260 ioapic_write\(io, IOAPIC_REDTBL_LO\(i\), l\);) 30.1 Tj
+0 -18.3273 Td
+(6261 h = ioapic_read\(io, IOAPIC_REDTBL_HI\(i\)\);) 30.1 Tj
+0 -19.6364 Td
+(6262 h &= ~IOART_DEST;) 15.652 Tj
+0 -20.9455 Td
+(6263 ioapic_write\(io, IOAPIC_REDTBL_HI\(i\), h\);) 30.1 Tj
+0 -22.2545 Td
+(6264 }) 4.816 Tj
+0 -23.5636 Td
+(6265 }) 3.612 Tj
+0 -24.8727 Td
+(6266 ) 3.01 Tj
+0 -26.1818 Td
+(6267 void) 5.418 Tj
+0 -27.4909 Td
+(6268 ioapic_enable \(int irq, int cpunum\)) 24.08 Tj
+0 -28.8 Td
+(6269 {) 3.612 Tj
+0 -30.1091 Td
+(6270 uint l, h;) 10.234 Tj
+0 -31.4182 Td
+(6271 struct ioapic *io;) 15.05 Tj
+0 -32.7273 Td
+(6272 ) 3.01 Tj
+0 -34.0364 Td
+(6273 if\(!ismp\)) 9.632 Tj
+0 -35.3454 Td
+(6274 return;) 9.632 Tj
+0 -36.6545 Td
+(6275 ) 3.01 Tj
+0 -37.9636 Td
+(6276 io = \(struct ioapic*\) IO_APIC_BASE;) 25.284 Tj
+0 -39.2727 Td
+(6277 l = ioapic_read\(io, IOAPIC_REDTBL_LO\(irq\)\);) 30.1 Tj
+0 -40.5818 Td
+(6278 l = l & ~IOART_INTMASK; // allow INTs) 27.09 Tj
+0 -41.8909 Td
+(6279 ioapic_write\(io, IOAPIC_REDTBL_LO\(irq\), l\);) 30.1 Tj
+0 -43.2 Td
+(6280 h = ioapic_read\(io, IOAPIC_REDTBL_HI\(irq\)\);) 30.1 Tj
+0 -44.5091 Td
+(6281 h &= ~IOART_DEST;) 14.448 Tj
+0 -45.8182 Td
+(6282 h |= \(cpunum << APIC_ID_SHIFT\);) 22.876 Tj
+0 -47.1272 Td
+(6283 ioapic_write\(io, IOAPIC_REDTBL_HI\(irq\), h\);) 30.1 Tj
+0 -48.4363 Td
+(6284 }) 3.612 Tj
+0 -49.7454 Td
+(6285 ) 3.01 Tj
+0 -51.0545 Td
+(6286 ) 3.01 Tj
+0 -52.3636 Td
+(6287 ) 3.01 Tj
+0 -53.6727 Td
+(6288 ) 3.01 Tj
+0 -54.9818 Td
+(6289 ) 3.01 Tj
+0 -56.2909 Td
+(6290 ) 3.01 Tj
+0 -57.6 Td
+(6291 ) 3.01 Tj
+0 -58.9091 Td
+(6292 ) 3.01 Tj
+0 -60.2181 Td
+(6293 ) 3.01 Tj
+0 -61.5272 Td
+(6294 ) 3.01 Tj
+0 -62.8363 Td
+(6295 ) 3.01 Tj
+0 -64.1454 Td
+(6296 ) 3.01 Tj
+0 -65.4545 Td
+(6297 ) 3.01 Tj
+0 -66.7636 Td
+(6298 ) 3.01 Tj
+0 -68.0727 Td
+(6299 ) 3.01 Tj
+0 -72 Td
+(Sheet 62) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 70 70
+%%BeginPageSetup
+%%PageOrientation: Landscape
+__tumble pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/picirq.c Page 1) 23.478 Tj
+0 -3.92728 Td
+(6300 #include "types.h") 13.846 Tj
+0 -5.23637 Td
+(6301 #include "x86.h") 12.642 Tj
+0 -6.54546 Td
+(6302 #include "traps.h") 13.846 Tj
+0 -7.85455 Td
+(6303 #include "defs.h") 13.244 Tj
+0 -9.16364 Td
+(6304 ) 3.01 Tj
+0 -10.4727 Td
+(6305 // I/O Addresses of the two 8259A programmable interrupt controllers) 43.946 Tj
+0 -11.7818 Td
+(6306 #define IO_PIC1 0x20 // Master \(IRQs 0-7\)) 34.314 Tj
+0 -13.0909 Td
+(6307 #define IO_PIC2 0xA0 // Slave \(IRQs 8-15\)) 34.314 Tj
+0 -14.4 Td
+(6308 ) 3.01 Tj
+0 -15.7091 Td
+(6309 #define IRQ_SLAVE 2 // IRQ at which slave connects to master) 46.354 Tj
+0 -17.0182 Td
+(6310 ) 3.01 Tj
+0 -18.3273 Td
+(6311 // Current IRQ mask.) 15.05 Tj
+0 -19.6364 Td
+(6312 // Initial IRQ mask has interrupt 2 enabled \(for slave 8259A\).) 40.334 Tj
+0 -20.9455 Td
+(6313 static ushort irq_mask_8259A = 0xFFFF & ~\(1<<IRQ_SLAVE\);) 36.722 Tj
+0 -22.2545 Td
+(6314 ) 3.01 Tj
+0 -23.5636 Td
+(6315 static void) 9.632 Tj
+0 -24.8727 Td
+(6316 irq_setmask_8259A\(ushort mask\)) 21.07 Tj
+0 -26.1818 Td
+(6317 {) 3.612 Tj
+0 -27.4909 Td
+(6318 irq_mask_8259A = mask;) 17.458 Tj
+0 -28.8 Td
+(6319 ) 3.01 Tj
+0 -30.1091 Td
+(6320 outb\(IO_PIC1+1, \(char\)mask\);) 21.07 Tj
+0 -31.4182 Td
+(6321 outb\(IO_PIC2+1, \(char\)\(mask >> 8\)\);) 25.284 Tj
+0 -32.7273 Td
+(6322 }) 3.612 Tj
+0 -34.0364 Td
+(6323 ) 3.01 Tj
+0 -35.3454 Td
+(6324 void) 5.418 Tj
+0 -36.6545 Td
+(6325 irq_enable\(int irq\)) 14.448 Tj
+0 -37.9636 Td
+(6326 {) 3.612 Tj
+0 -39.2727 Td
+(6327 irq_setmask_8259A\(irq_mask_8259A & ~\(1<<irq\)\);) 31.906 Tj
+0 -40.5818 Td
+(6328 }) 3.612 Tj
+0 -41.8909 Td
+(6329 ) 3.01 Tj
+0 -43.2 Td
+(6330 // Initialize the 8259A interrupt controllers.) 30.702 Tj
+0 -44.5091 Td
+(6331 void) 5.418 Tj
+0 -45.8182 Td
+(6332 pic_init\(void\)) 11.438 Tj
+0 -47.1272 Td
+(6333 {) 3.612 Tj
+0 -48.4363 Td
+(6334 // mask all interrupts) 17.458 Tj
+0 -49.7454 Td
+(6335 outb\(IO_PIC1+1, 0xFF\);) 17.458 Tj
+0 -51.0545 Td
+(6336 outb\(IO_PIC2+1, 0xFF\);) 17.458 Tj
+0 -52.3636 Td
+(6337 ) 3.01 Tj
+0 -53.6727 Td
+(6338 // Set up master \(8259A-1\)) 19.866 Tj
+0 -54.9818 Td
+(6339 ) 3.01 Tj
+0 -56.2909 Td
+(6340 // ICW1: 0001g0hi) 15.05 Tj
+0 -57.6 Td
+(6341 // g: 0 = edge triggering, 1 = level triggering) 34.916 Tj
+0 -58.9091 Td
+(6342 // h: 0 = cascaded PICs, 1 = master only) 30.702 Tj
+0 -60.2181 Td
+(6343 // i: 0 = no ICW4, 1 = ICW4 required) 28.294 Tj
+0 -61.5272 Td
+(6344 outb\(IO_PIC1, 0x11\);) 16.254 Tj
+0 -62.8363 Td
+(6345 ) 3.01 Tj
+0 -64.1454 Td
+(6346 // ICW2: Vector offset) 18.06 Tj
+0 -65.4545 Td
+(6347 outb\(IO_PIC1+1, IRQ_OFFSET\);) 21.07 Tj
+0 -66.7636 Td
+(6348 ) 3.01 Tj
+0 -68.0727 Td
+(6349 ) 3.01 Tj
+0 -72 Td
+(Sheet 63) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/picirq.c Page 2) 23.478 Tj
+0 -3.92728 Td
+(6350 // ICW3: \(master PIC\) bit mask of IR lines connected to slaves) 42.14 Tj
+0 -5.23637 Td
+(6351 // \(slave PIC\) 3-bit # of slave's connection to master) 40.936 Tj
+0 -6.54546 Td
+(6352 outb\(IO_PIC1+1, 1<<IRQ_SLAVE\);) 22.274 Tj
+0 -7.85455 Td
+(6353 ) 3.01 Tj
+0 -9.16364 Td
+(6354 // ICW4: 000nbmap) 15.05 Tj
+0 -10.4727 Td
+(6355 // n: 1 = special fully nested mode) 27.692 Tj
+0 -11.7818 Td
+(6356 // b: 1 = buffered mode) 20.468 Tj
+0 -13.0909 Td
+(6357 // m: 0 = slave PIC, 1 = master PIC) 27.692 Tj
+0 -14.4 Td
+(6358 // \(ignored when b is 0, as the master/slave role) 36.722 Tj
+0 -15.7091 Td
+(6359 // can be hardwired\).) 19.866 Tj
+0 -17.0182 Td
+(6360 // a: 1 = Automatic EOI mode) 23.478 Tj
+0 -18.3273 Td
+(6361 // p: 0 = MCS-80/85 mode, 1 = intel x86 mode) 33.11 Tj
+0 -19.6364 Td
+(6362 outb\(IO_PIC1+1, 0x3\);) 16.856 Tj
+0 -20.9455 Td
+(6363 ) 3.01 Tj
+0 -22.2545 Td
+(6364 // Set up slave \(8259A-2\)) 19.264 Tj
+0 -23.5636 Td
+(6365 outb\(IO_PIC2, 0x11\); // ICW1) 31.304 Tj
+0 -24.8727 Td
+(6366 outb\(IO_PIC2+1, IRQ_OFFSET + 8\); // ICW2) 31.304 Tj
+0 -26.1818 Td
+(6367 outb\(IO_PIC2+1, IRQ_SLAVE\); // ICW3) 31.304 Tj
+0 -27.4909 Td
+(6368 // NB Automatic EOI mode doesn't tend to work on the slave.) 39.732 Tj
+0 -28.8 Td
+(6369 // Linux source code says it's "to be investigated".) 35.518 Tj
+0 -30.1091 Td
+(6370 outb\(IO_PIC2+1, 0x3\); // ICW4) 31.304 Tj
+0 -31.4182 Td
+(6371 ) 3.01 Tj
+0 -32.7273 Td
+(6372 // OCW3: 0ef01prs) 15.05 Tj
+0 -34.0364 Td
+(6373 // ef: 0x = NOP, 10 = clear specific mask, 11 = set specific mask) 45.15 Tj
+0 -35.3454 Td
+(6374 // p: 0 = no polling, 1 = polling mode) 29.498 Tj
+0 -36.6545 Td
+(6375 // rs: 0x = NOP, 10 = read IRR, 11 = read ISR) 33.11 Tj
+0 -37.9636 Td
+(6376 outb\(IO_PIC1, 0x68\); // clear specific mask) 37.324 Tj
+0 -39.2727 Td
+(6377 outb\(IO_PIC1, 0x0a\); // read IRR by default) 37.324 Tj
+0 -40.5818 Td
+(6378 ) 3.01 Tj
+0 -41.8909 Td
+(6379 outb\(IO_PIC2, 0x68\); // OCW3) 28.294 Tj
+0 -43.2 Td
+(6380 outb\(IO_PIC2, 0x0a\); // OCW3) 28.294 Tj
+0 -44.5091 Td
+(6381 ) 3.01 Tj
+0 -45.8182 Td
+(6382 if\(irq_mask_8259A != 0xFFFF\)) 21.07 Tj
+0 -47.1272 Td
+(6383 irq_setmask_8259A\(irq_mask_8259A\);) 25.886 Tj
+0 -48.4363 Td
+(6384 }) 3.612 Tj
+0 -49.7454 Td
+(6385 ) 3.01 Tj
+0 -51.0545 Td
+(6386 ) 3.01 Tj
+0 -52.3636 Td
+(6387 ) 3.01 Tj
+0 -53.6727 Td
+(6388 ) 3.01 Tj
+0 -54.9818 Td
+(6389 ) 3.01 Tj
+0 -56.2909 Td
+(6390 ) 3.01 Tj
+0 -57.6 Td
+(6391 ) 3.01 Tj
+0 -58.9091 Td
+(6392 ) 3.01 Tj
+0 -60.2181 Td
+(6393 ) 3.01 Tj
+0 -61.5272 Td
+(6394 ) 3.01 Tj
+0 -62.8363 Td
+(6395 ) 3.01 Tj
+0 -64.1454 Td
+(6396 ) 3.01 Tj
+0 -65.4545 Td
+(6397 ) 3.01 Tj
+0 -66.7636 Td
+(6398 ) 3.01 Tj
+0 -68.0727 Td
+(6399 ) 3.01 Tj
+0 -72 Td
+(Sheet 63) 4.816 Tj
+Q
+Q
+Q
+Q
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+(6413 // Copy console output to parallel port, which you can tell) 38.528 Tj
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+(6414 // .bochsrc to copy to the stdout:) 23.478 Tj
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+(6431 int crtport = 0x3d4; // io port of CGA) 27.09 Tj
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+(6432 ushort *crt = \(ushort*\) 0xB8000; // base of CGA memory) 36.722 Tj
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+(6445 ind = inb\(crtport + 1\) << 8;) 21.07 Tj
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+(6601 #define KBS_DIB 0x01 // kbd data in buffer) 34.916 Tj
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+(6602 #define KBDATAP 0x60 // kbd data port\(I\)) 33.712 Tj
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+(6603 ) 3.01 Tj
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+(6604 #define NO 0) 18.06 Tj
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+(6614 #define E0ESC \(1<<6\)) 21.07 Tj
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+(6616 // Special keycodes) 14.448 Tj
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+(6632 [0x36] SHIFT,) 12.04 Tj
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+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/console.c Page 6) 24.08 Tj
+0 -3.92728 Td
+(6650 static uchar normalmap[256] =) 20.468 Tj
+0 -5.23637 Td
+(6651 {) 3.612 Tj
+0 -6.54546 Td
+(6652 NO, 0x1B, '1', '2', '3', '4', '5', '6', // 0x00) 37.324 Tj
+0 -7.85455 Td
+(6653 '7', '8', '9', '0', '-', '=', '\\b', '\\t',) 32.508 Tj
+0 -9.16364 Td
+(6654 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', // 0x10) 37.324 Tj
+0 -10.4727 Td
+(6655 'o', 'p', '[', ']', '\\n', NO, 'a', 's',) 31.906 Tj
+0 -11.7818 Td
+(6656 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', // 0x20) 37.324 Tj
+0 -13.0909 Td
+(6657 '\\'', '`', NO, '\\\\', 'z', 'x', 'c', 'v',) 31.906 Tj
+0 -14.4 Td
+(6658 'b', 'n', 'm', ',', '.', '/', NO, '*', // 0x30) 37.324 Tj
+0 -15.7091 Td
+(6659 NO, ' ', NO, NO, NO, NO, NO, NO,) 31.304 Tj
+0 -17.0182 Td
+(6660 NO, NO, NO, NO, NO, NO, NO, '7', // 0x40) 37.324 Tj
+0 -18.3273 Td
+(6661 '8', '9', '-', '4', '5', '6', '+', '1',) 31.906 Tj
+0 -19.6364 Td
+(6662 '2', '3', '0', '.', NO, NO, NO, NO, // 0x50) 37.324 Tj
+0 -20.9455 Td
+(6663 [0x97] KEY_HOME,) 13.846 Tj
+0 -22.2545 Td
+(6664 [0x9C] '\\n', // KP_Enter) 21.672 Tj
+0 -23.5636 Td
+(6665 [0xB5] '/', // KP_Div) 20.468 Tj
+0 -24.8727 Td
+(6666 [0xC8] KEY_UP,) 12.642 Tj
+0 -26.1818 Td
+(6667 [0xC9] KEY_PGUP,) 13.846 Tj
+0 -27.4909 Td
+(6668 [0xCB] KEY_LF,) 12.642 Tj
+0 -28.8 Td
+(6669 [0xCD] KEY_RT,) 12.642 Tj
+0 -30.1091 Td
+(6670 [0xCF] KEY_END,) 13.244 Tj
+0 -31.4182 Td
+(6671 [0xD0] KEY_DN,) 12.642 Tj
+0 -32.7273 Td
+(6672 [0xD1] KEY_PGDN,) 13.846 Tj
+0 -34.0364 Td
+(6673 [0xD2] KEY_INS,) 13.244 Tj
+0 -35.3454 Td
+(6674 [0xD3] KEY_DEL) 12.642 Tj
+0 -36.6545 Td
+(6675 };) 4.214 Tj
+0 -37.9636 Td
+(6676 ) 3.01 Tj
+0 -39.2727 Td
+(6677 static uchar shiftmap[256] =) 19.866 Tj
+0 -40.5818 Td
+(6678 {) 3.612 Tj
+0 -41.8909 Td
+(6679 NO, 033, '!', '@', '#', '$', '%', '^', // 0x00) 37.324 Tj
+0 -43.2 Td
+(6680 '&', '*', '\(', '\)', '_', '+', '\\b', '\\t',) 32.508 Tj
+0 -44.5091 Td
+(6681 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', // 0x10) 37.324 Tj
+0 -45.8182 Td
+(6682 'O', 'P', '{', '}', '\\n', NO, 'A', 'S',) 31.906 Tj
+0 -47.1272 Td
+(6683 'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', // 0x20) 37.324 Tj
+0 -48.4363 Td
+(6684 '"', '~', NO, '|', 'Z', 'X', 'C', 'V',) 31.906 Tj
+0 -49.7454 Td
+(6685 'B', 'N', 'M', '<', '>', '?', NO, '*', // 0x30) 37.324 Tj
+0 -51.0545 Td
+(6686 NO, ' ', NO, NO, NO, NO, NO, NO,) 31.304 Tj
+0 -52.3636 Td
+(6687 NO, NO, NO, NO, NO, NO, NO, '7', // 0x40) 37.324 Tj
+0 -53.6727 Td
+(6688 '8', '9', '-', '4', '5', '6', '+', '1',) 31.906 Tj
+0 -54.9818 Td
+(6689 '2', '3', '0', '.', NO, NO, NO, NO, // 0x50) 37.324 Tj
+0 -56.2909 Td
+(6690 [0x97] KEY_HOME,) 13.846 Tj
+0 -57.6 Td
+(6691 [0x9C] '\\n', // KP_Enter) 21.672 Tj
+0 -58.9091 Td
+(6692 [0xB5] '/', // KP_Div) 20.468 Tj
+0 -60.2181 Td
+(6693 [0xC8] KEY_UP,) 12.642 Tj
+0 -61.5272 Td
+(6694 [0xC9] KEY_PGUP,) 13.846 Tj
+0 -62.8363 Td
+(6695 [0xCB] KEY_LF,) 12.642 Tj
+0 -64.1454 Td
+(6696 [0xCD] KEY_RT,) 12.642 Tj
+0 -65.4545 Td
+(6697 [0xCF] KEY_END,) 13.244 Tj
+0 -66.7636 Td
+(6698 [0xD0] KEY_DN,) 12.642 Tj
+0 -68.0727 Td
+(6699 [0xD1] KEY_PGDN,) 13.846 Tj
+0 -72 Td
+(Sheet 66) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 74 74
+%%BeginPageSetup
+%%PageOrientation: Landscape
+__tumble pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/console.c Page 7) 24.08 Tj
+0 -3.92728 Td
+(6700 [0xD2] KEY_INS,) 13.244 Tj
+0 -5.23637 Td
+(6701 [0xD3] KEY_DEL) 12.642 Tj
+0 -6.54546 Td
+(6702 };) 4.214 Tj
+0 -7.85455 Td
+(6703 ) 3.01 Tj
+0 -9.16364 Td
+(6704 #define C\(x\) \(x - '@'\)) 16.254 Tj
+0 -10.4727 Td
+(6705 ) 3.01 Tj
+0 -11.7818 Td
+(6706 static uchar ctlmap[256] =) 18.662 Tj
+0 -13.0909 Td
+(6707 {) 3.612 Tj
+0 -14.4 Td
+(6708 NO, NO, NO, NO, NO, NO, NO, NO,) 43.946 Tj
+0 -15.7091 Td
+(6709 NO, NO, NO, NO, NO, NO, NO, NO,) 43.946 Tj
+0 -17.0182 Td
+(6710 C\('Q'\), C\('W'\), C\('E'\), C\('R'\), C\('T'\), C\('Y'\), C\('U'\), C\('I'\),) 46.354 Tj
+0 -18.3273 Td
+(6711 C\('O'\), C\('P'\), NO, NO, '\\r', NO, C\('A'\), C\('S'\),) 46.354 Tj
+0 -19.6364 Td
+(6712 C\('D'\), C\('F'\), C\('G'\), C\('H'\), C\('J'\), C\('K'\), C\('L'\), NO,) 43.946 Tj
+0 -20.9455 Td
+(6713 NO, NO, NO, C\('\\\\'\), C\('Z'\), C\('X'\), C\('C'\), C\('V'\),) 46.354 Tj
+0 -22.2545 Td
+(6714 C\('B'\), C\('N'\), C\('M'\), NO, NO, C\('/'\), NO, NO,) 43.946 Tj
+0 -23.5636 Td
+(6715 [0x97] KEY_HOME,) 13.846 Tj
+0 -24.8727 Td
+(6716 [0xB5] C\('/'\), // KP_Div) 20.468 Tj
+0 -26.1818 Td
+(6717 [0xC8] KEY_UP,) 12.642 Tj
+0 -27.4909 Td
+(6718 [0xC9] KEY_PGUP,) 13.846 Tj
+0 -28.8 Td
+(6719 [0xCB] KEY_LF,) 12.642 Tj
+0 -30.1091 Td
+(6720 [0xCD] KEY_RT,) 12.642 Tj
+0 -31.4182 Td
+(6721 [0xCF] KEY_END,) 13.244 Tj
+0 -32.7273 Td
+(6722 [0xD0] KEY_DN,) 12.642 Tj
+0 -34.0364 Td
+(6723 [0xD1] KEY_PGDN,) 13.846 Tj
+0 -35.3454 Td
+(6724 [0xD2] KEY_INS,) 13.244 Tj
+0 -36.6545 Td
+(6725 [0xD3] KEY_DEL) 12.642 Tj
+0 -37.9636 Td
+(6726 };) 4.214 Tj
+0 -39.2727 Td
+(6727 ) 3.01 Tj
+0 -40.5818 Td
+(6728 static uchar *charcode[4] = {) 20.468 Tj
+0 -41.8909 Td
+(6729 normalmap,) 10.234 Tj
+0 -43.2 Td
+(6730 shiftmap,) 9.632 Tj
+0 -44.5091 Td
+(6731 ctlmap,) 8.428 Tj
+0 -45.8182 Td
+(6732 ctlmap) 7.826 Tj
+0 -47.1272 Td
+(6733 };) 4.214 Tj
+0 -48.4363 Td
+(6734 ) 3.01 Tj
+0 -49.7454 Td
+(6735 #define KBD_BUF 64) 13.846 Tj
+0 -51.0545 Td
+(6736 char kbd_buf[KBD_BUF];) 16.254 Tj
+0 -52.3636 Td
+(6737 int kbd_r;) 9.03 Tj
+0 -53.6727 Td
+(6738 int kbd_w;) 9.03 Tj
+0 -54.9818 Td
+(6739 struct spinlock kbd_lock;) 18.06 Tj
+0 -56.2909 Td
+(6740 static uint shift;) 13.846 Tj
+0 -57.6 Td
+(6741 ) 3.01 Tj
+0 -58.9091 Td
+(6742 void) 5.418 Tj
+0 -60.2181 Td
+(6743 kbd_intr\(\)) 9.03 Tj
+0 -61.5272 Td
+(6744 {) 3.612 Tj
+0 -62.8363 Td
+(6745 uint st, data, c;) 14.448 Tj
+0 -64.1454 Td
+(6746 ) 3.01 Tj
+0 -65.4545 Td
+(6747 acquire\(&kbd_lock\);) 15.652 Tj
+0 -66.7636 Td
+(6748 ) 3.01 Tj
+0 -68.0727 Td
+(6749 ) 3.01 Tj
+0 -72 Td
+(Sheet 67) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/console.c Page 8) 24.08 Tj
+0 -3.92728 Td
+(6750 st = inb\(KBSTATP\);) 15.05 Tj
+0 -5.23637 Td
+(6751 if\(\(st & KBS_DIB\) == 0\)) 18.06 Tj
+0 -6.54546 Td
+(6752 goto out;) 10.836 Tj
+0 -7.85455 Td
+(6753 data = inb\(KBDATAP\);) 16.254 Tj
+0 -9.16364 Td
+(6754 ) 3.01 Tj
+0 -10.4727 Td
+(6755 if\(data == 0xE0\) {) 15.05 Tj
+0 -11.7818 Td
+(6756 shift |= E0ESC;) 14.448 Tj
+0 -13.0909 Td
+(6757 goto out;) 10.836 Tj
+0 -14.4 Td
+(6758 } else if\(data & 0x80\) {) 18.662 Tj
+0 -15.7091 Td
+(6759 // Key released) 14.448 Tj
+0 -17.0182 Td
+(6760 data = \(shift & E0ESC ? data : data & 0x7F\);) 31.906 Tj
+0 -18.3273 Td
+(6761 shift &= ~\(shiftcode[data] | E0ESC\);) 27.09 Tj
+0 -19.6364 Td
+(6762 goto out;) 10.836 Tj
+0 -20.9455 Td
+(6763 } else if\(shift & E0ESC\) {) 19.866 Tj
+0 -22.2545 Td
+(6764 // Last character was an E0 escape; or with 0x80) 34.314 Tj
+0 -23.5636 Td
+(6765 data |= 0x80;) 13.244 Tj
+0 -24.8727 Td
+(6766 shift &= ~E0ESC;) 15.05 Tj
+0 -26.1818 Td
+(6767 }) 4.816 Tj
+0 -27.4909 Td
+(6768 ) 3.01 Tj
+0 -28.8 Td
+(6769 shift |= shiftcode[data];) 19.264 Tj
+0 -30.1091 Td
+(6770 shift ^= togglecode[data];) 19.866 Tj
+0 -31.4182 Td
+(6771 ) 3.01 Tj
+0 -32.7273 Td
+(6772 c = charcode[shift & \(CTL | SHIFT\)][data];) 29.498 Tj
+0 -34.0364 Td
+(6773 if\(shift & CAPSLOCK\) {) 17.458 Tj
+0 -35.3454 Td
+(6774 if\('a' <= c && c <= 'z'\)) 19.866 Tj
+0 -36.6545 Td
+(6775 c += 'A' - 'a';) 15.652 Tj
+0 -37.9636 Td
+(6776 else if\('A' <= c && c <= 'Z'\)) 22.876 Tj
+0 -39.2727 Td
+(6777 c += 'a' - 'A';) 15.652 Tj
+0 -40.5818 Td
+(6778 }) 4.816 Tj
+0 -41.8909 Td
+(6779 ) 3.01 Tj
+0 -43.2 Td
+(6780 switch\(c\){) 10.234 Tj
+0 -44.5091 Td
+(6781 case 0:) 8.428 Tj
+0 -45.8182 Td
+(6782 // Ignore unknown keystrokes.) 22.876 Tj
+0 -47.1272 Td
+(6783 break;) 9.03 Tj
+0 -48.4363 Td
+(6784 ) 3.01 Tj
+0 -49.7454 Td
+(6785 case C\('T'\):) 11.438 Tj
+0 -51.0545 Td
+(6786 cprintf\("#"\); // Let user know we're still alive.) 35.518 Tj
+0 -52.3636 Td
+(6787 break;) 9.03 Tj
+0 -53.6727 Td
+(6788 ) 3.01 Tj
+0 -54.9818 Td
+(6789 case C\('P'\):) 11.438 Tj
+0 -56.2909 Td
+(6790 procdump\(\);) 12.04 Tj
+0 -57.6 Td
+(6791 break;) 9.03 Tj
+0 -58.9091 Td
+(6792 ) 3.01 Tj
+0 -60.2181 Td
+(6793 default:) 9.03 Tj
+0 -61.5272 Td
+(6794 if\(\(\(kbd_w + 1\) % KBD_BUF\) != kbd_r\){) 27.692 Tj
+0 -62.8363 Td
+(6795 kbd_buf[kbd_w++] = c;) 19.264 Tj
+0 -64.1454 Td
+(6796 if\(kbd_w >= KBD_BUF\)) 18.662 Tj
+0 -65.4545 Td
+(6797 kbd_w = 0;) 13.846 Tj
+0 -66.7636 Td
+(6798 wakeup\(&kbd_r\);) 15.652 Tj
+0 -68.0727 Td
+(6799 }) 6.02 Tj
+0 -72 Td
+(Sheet 67) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Page: 75 75
+%%BeginPageSetup
+%%PageOrientation: Landscape
+pdfStartPage
+%%EndPageSetup
+[] 0 d
+1 i
+0 j
+0 J
+10 M
+1 w
+0 g
+0 G
+q
+q
+[0.1 0 0 0.1 0 0] cm
+q
+Q
+q
+180 3960 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 738.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/console.c Page 9) 24.08 Tj
+0 -3.92728 Td
+(6800 break;) 9.03 Tj
+0 -5.23637 Td
+(6801 }) 4.816 Tj
+0 -6.54546 Td
+(6802 ) 3.01 Tj
+0 -7.85455 Td
+(6803 out:) 5.418 Tj
+0 -9.16364 Td
+(6804 release\(&kbd_lock\);) 15.652 Tj
+0 -10.4727 Td
+(6805 }) 3.612 Tj
+0 -11.7818 Td
+(6806 ) 3.01 Tj
+0 -13.0909 Td
+(6807 int) 4.816 Tj
+0 -14.4 Td
+(6808 console_read\(int minor, char *dst, int n\)) 27.692 Tj
+0 -15.7091 Td
+(6809 {) 3.612 Tj
+0 -17.0182 Td
+(6810 uint target = n;) 13.846 Tj
+0 -18.3273 Td
+(6811 ) 3.01 Tj
+0 -19.6364 Td
+(6812 acquire\(&kbd_lock\);) 15.652 Tj
+0 -20.9455 Td
+(6813 ) 3.01 Tj
+0 -22.2545 Td
+(6814 while\(kbd_w == kbd_r\) {) 18.06 Tj
+0 -23.5636 Td
+(6815 sleep\(&kbd_r, &kbd_lock\);) 20.468 Tj
+0 -24.8727 Td
+(6816 }) 4.816 Tj
+0 -26.1818 Td
+(6817 ) 3.01 Tj
+0 -27.4909 Td
+(6818 while\(n > 0 && kbd_w != kbd_r\){) 22.876 Tj
+0 -28.8 Td
+(6819 *dst = \(kbd_buf[kbd_r]\) & 0xff;) 24.08 Tj
+0 -30.1091 Td
+(6820 cons_putc\(*dst & 0xff\);) 19.264 Tj
+0 -31.4182 Td
+(6821 dst++;) 9.03 Tj
+0 -32.7273 Td
+(6822 --n;) 7.826 Tj
+0 -34.0364 Td
+(6823 kbd_r++;) 10.234 Tj
+0 -35.3454 Td
+(6824 if\(kbd_r >= KBD_BUF\)) 17.458 Tj
+0 -36.6545 Td
+(6825 kbd_r = 0;) 12.642 Tj
+0 -37.9636 Td
+(6826 }) 4.816 Tj
+0 -39.2727 Td
+(6827 ) 3.01 Tj
+0 -40.5818 Td
+(6828 release\(&kbd_lock\);) 15.652 Tj
+0 -41.8909 Td
+(6829 ) 3.01 Tj
+0 -43.2 Td
+(6830 return target - n;) 15.05 Tj
+0 -44.5091 Td
+(6831 }) 3.612 Tj
+0 -45.8182 Td
+(6832 ) 3.01 Tj
+0 -47.1272 Td
+(6833 void) 5.418 Tj
+0 -48.4363 Td
+(6834 console_init\(\)) 11.438 Tj
+0 -49.7454 Td
+(6835 {) 3.612 Tj
+0 -51.0545 Td
+(6836 initlock\(&console_lock, "console"\);) 25.284 Tj
+0 -52.3636 Td
+(6837 initlock\(&kbd_lock, "kbd"\);) 20.468 Tj
+0 -53.6727 Td
+(6838 ) 3.01 Tj
+0 -54.9818 Td
+(6839 devsw[CONSOLE].write = console_write;) 26.488 Tj
+0 -56.2909 Td
+(6840 devsw[CONSOLE].read = console_read;) 25.284 Tj
+0 -57.6 Td
+(6841 ) 3.01 Tj
+0 -58.9091 Td
+(6842 irq_enable\(IRQ_KBD\);) 16.254 Tj
+0 -60.2181 Td
+(6843 ioapic_enable\(IRQ_KBD, 0\);) 19.866 Tj
+0 -61.5272 Td
+(6844 ) 3.01 Tj
+0 -62.8363 Td
+(6845 use_console_lock = 1;) 16.856 Tj
+0 -64.1454 Td
+(6846 }) 3.612 Tj
+0 -65.4545 Td
+(6847 ) 3.01 Tj
+0 -66.7636 Td
+(6848 ) 3.01 Tj
+0 -68.0727 Td
+(6849 ) 3.01 Tj
+0 -72 Td
+(Sheet 68) 4.816 Tj
+Q
+Q
+q
+180 500 5760 3460 re
+W
+q
+[10 0 0 10 0 0] cm
+[1 0 0 1 0 0] Tm
+0 0 Td
+[0 -7.0183 7.25185 0 564.72 392.865] Tm
+0 0 Td
+/F10_0 1 Tf
+(Sep 8 11:37 2006 xv6/8253pit.c Page 1) 24.08 Tj
+0 -3.92728 Td
+(6850 #include "types.h") 13.846 Tj
+0 -5.23637 Td
+(6851 #include "x86.h") 12.642 Tj
+0 -6.54546 Td
+(6852 #include "defs.h") 13.244 Tj
+0 -7.85455 Td
+(6853 #include "traps.h") 13.846 Tj
+0 -9.16364 Td
+(6854 ) 3.01 Tj
+0 -10.4727 Td
+(6855 // Register definitions for the Intel) 25.284 Tj
+0 -11.7818 Td
+(6856 // 8253/8254/82C54 Programmable Interval Timer \(PIT\).) 34.916 Tj
+0 -13.0909 Td
+(6857 ) 3.01 Tj
+0 -14.4 Td
+(6858 #define IO_TIMER1 0x040 // 8253 Timer #1) 36.722 Tj
+0 -15.7091 Td
+(6859 #define IO_TIMER2 0x048 // 8253 Timer #2 \(EISA only\)) 43.946 Tj
+0 -17.0182 Td
+(6860 ) 3.01 Tj
+0 -18.3273 Td
+(6861 // Frequency of all three count-down timers; \(TIMER_FREQ/freq\) is the) 44.548 Tj
+0 -19.6364 Td
+(6862 // appropriate count to generate a frequency of freq hz.) 36.722 Tj
+0 -20.9455 Td
+(6863 ) 3.01 Tj
+0 -22.2545 Td
+(6864 #define TIMER_FREQ 1193182) 21.672 Tj
+0 -23.5636 Td
+(6865 #define TIMER_DIV\(x\) \(\(TIMER_FREQ+\(x\)/2\)/\(x\)\)) 31.906 Tj
+0 -24.8727 Td
+(6866 ) 3.01 Tj
+0 -26.1818 Td
+(6867 #define TIMER_CNTR0 \(IO_TIMER1 + 0\) // timer 0 counter port) 40.936 Tj
+0 -27.4909 Td
+(6868 #define TIMER_CNTR1 \(IO_TIMER1 + 1\) // timer 1 counter port) 40.936 Tj
+0 -28.8 Td
+(6869 #define TIMER_CNTR2 \(IO_TIMER1 + 2\) // timer 2 counter port) 40.936 Tj
+0 -30.1091 Td
+(6870 #define TIMER_MODE \(IO_TIMER1 + 3\) // timer mode port) 37.926 Tj
+0 -31.4182 Td
+(6871 #define TIMER_SEL0 0x00 // select counter 0) 33.712 Tj
+0 -32.7273 Td
+(6872 #define TIMER_SEL1 0x40 // select counter 1) 33.712 Tj
+0 -34.0364 Td
+(6873 #define TIMER_SEL2 0x80 // select counter 2) 33.712 Tj
+0 -35.3454 Td
+(6874 #define TIMER_INTTC 0x00 // mode 0, intr on terminal cnt) 40.936 Tj
+0 -36.6545 Td
+(6875 #define TIMER_ONESHOT 0x02 // mode 1, one shot) 33.712 Tj
+0 -37.9636 Td
+(6876 #define TIMER_RATEGEN 0x04 // mode 2, rate generator) 37.324 Tj
+0 -39.2727 Td
+(6877 #define TIMER_SQWAVE 0x06 // mode 3, square wave) 35.518 Tj
+0 -40.5818 Td
+(6878 #define TIMER_SWSTROBE 0x08 // mode 4, s/w triggered strobe) 40.936 Tj
+0 -41.8909 Td
+(6879 #define TIMER_HWSTROBE 0x0a // mode 5, h/w triggered strobe) 40.936 Tj
+0 -43.2 Td
+(6880 #define TIMER_LATCH 0x00 // latch counter for reading) 39.13 Tj
+0 -44.5091 Td
+(6881 #define TIMER_LSB 0x10 // r/w counter LSB) 33.11 Tj
+0 -45.8182 Td
+(6882 #define TIMER_MSB 0x20 // r/w counter MSB) 33.11 Tj
+0 -47.1272 Td
+(6883 #define TIMER_16BIT 0x30 // r/w counter 16 bits, LSB first) 42.14 Tj
+0 -48.4363 Td
+(6884 #define TIMER_BCD 0x01 // count in BCD) 31.304 Tj
+0 -49.7454 Td
+(6885 ) 3.01 Tj
+0 -51.0545 Td
+(6886 void) 5.418 Tj
+0 -52.3636 Td
+(6887 pit8253_timerinit\(void\)) 16.856 Tj
+0 -53.6727 Td
+(6888 {) 3.612 Tj
+0 -54.9818 Td
+(6889 // initialize 8253 clock to interrupt 100 times/sec) 34.916 Tj
+0 -56.2909 Td
+(6890 outb\(TIMER_MODE, TIMER_SEL0 | TIMER_RATEGEN | TIMER_16BIT\);) 39.732 Tj
+0 -57.6 Td
+(6891 outb\(IO_TIMER1, TIMER_DIV\(100\) % 256\);) 27.09 Tj
+0 -58.9091 Td
+(6892 outb\(IO_TIMER1, TIMER_DIV\(100\) / 256\);) 27.09 Tj
+0 -60.2181 Td
+(6893 irq_enable\(IRQ_TIMER\);) 17.458 Tj
+0 -61.5272 Td
+(6894 }) 3.612 Tj
+0 -62.8363 Td
+(6895 ) 3.01 Tj
+0 -64.1454 Td
+(6896 ) 3.01 Tj
+0 -65.4545 Td
+(6897 ) 3.01 Tj
+0 -66.7636 Td
+(6898 ) 3.01 Tj
+0 -68.0727 Td
+(6899 ) 3.01 Tj
+0 -72 Td
+(Sheet 68) 4.816 Tj
+Q
+Q
+Q
+Q
+showpage
+%%PageTrailer
+pdfEndPage
+%%Trailer
+end
+%%DocumentSuppliedResources:
+%%+ font LTWFJF+OurCharSet
+%%EOF
projects / cs3210-lab0.git / commitdiff