Add useful tools

* Add script 'buildall' to perform cmake/make steps
* Add script 'runxv6' to automatically chdir and run the right
  VM

diff --git a/tools/buildall b/tools/buildall
new file mode 100755 (executable)
index 0000000..4af1d10
--- /dev/null
+++ b/tools/buildall
@@ -0,0 +1,6 @@
+#!/bin/sh
+set -e
+mkdir -p build
+cd build
+cmake .. -DCMAKE_BUILD_TYPE=Debug
+make

diff --git a/tools/runxv6 b/tools/runxv6
new file mode 100755 (executable)
index 0000000..7ee03a5
--- /dev/null
+++ b/tools/runxv6
@@ -0,0 +1,3 @@
+#!/bin/bash
+cd build
+./xv6-qemu "$@"