README added.
console color supported.
console color stack and stack backtrace added.
stabs not implemented.
grade passed.
don't understand stabs.
Merge branch 'lab1' into lab2
implement some function in pmap.c
add some comments to pmap.h
purely hand-written.
add my codeblocks project file.
I think the physical page allocator is done.
code is in page_init();
keep working, already solving bugs.
keep working.
I think check_page() is passed. great.
Lab 2 grade passed. coding style fix.
add references.
Merge branch 'lab2' into lab3
copied some of my old codes.
lab3评分给我这么高分，bug出这么少真是幸运。load_icode是抄的，哈哈。
Grade passed. 75/80 is due to how grade-lab3 judges. the program is OK!
see kern/syscall.c sys_cputs(const char* s, size_t len);
monitor continue added && coding style fix.
monitor single step seems working. Didn't verify though.
Time to start lab4.