Code file and directroy:
	bochsrc		/* configuration of bochs */
	boot		/* booter,loader... */
	docs		/*  documents */
	include		/* struct, macro, declearation... */ 
	kernel		/* kernel */
	lib			/* common function like disp_str()... */
	Makefile	
	README

All operations below are tested in Lubuntu 13.04,
I suppose it also works at Ubuntu.

Install bochs
	bochs is a x86 PC emulator, it can run our kernel demo.
	In order to enable debugger, you should download source and compile it.

	For example, download file "bochs-2.6.1.tar.gz", and extract it.
	$ tar -zxvf bochs-2.6.1.tar.gz

	Before generating Makefile, maybe some librarys are needed.
	$ sudo apt-get install gcc
	$ sudo apt-get install build-essential
	$ sudo apt-get install xorg-dev
	$ sudo apt-get install libgtk2.0-dev

	Then, enter the source directory
	$ cd bochs-2.6.1

	There is a mistake to generate Makefile,
	we should fix it.
	$ vim Makefile.in
	At line 190 of Makefile.in, add "-lpthread"

	Then, generate Makefile, compile, link, and install
	$ ./configure --enable-debugger --enable-disasm 
	$ make
	$ sudo make install

Prepare directory
	At the root directory of our repository,
	$ mkdir image
	$ mkdir build
	$ mkdir obj
	$ cd /mnt;sudo mkdir floppy;cd -


Creare image file
	Create image file "my_os.img"
	$ cd image
	$ bximage
	
	Make filesystem
	$ mkfs.msdos my_os.img
	$ cd ..


Build:
	We need nasm
	$ sudo apt-get install nasm
	$ make all

Run bochs:
	The configure file "bochsrc" is in repository now, 
	so just type 'bochs', OS's kernel placed at address 0x30400,
	you can make breakpoint at that address.