set compiler toolchain and qemu exec
notes and fix typo
use i386 qemu; comments on boot.S:GDT and segment desc
exec 8: add %o to printf
comment on _start and entry addresses
gitignore
indent all sources
indenting console.c
exec 10: backtrace
exec 12: backtrace. XXX: line number is always 0???
disable -O1
all execsices complete, grade should all passed, 30/50 makes no sense
merge updates from lab1
indent