Orange's notes (1)

Chapter 1

Write a small Bootstrap code:

 1     org    07c00h 2     mov    ax,cs 3     mov    ds,ax 4     mov     es,ax 5     call     DispStr 6     jmp    $ 7 DispStr: 8     mov    ax,BootMessage 9     mov    bp,ax10     mov    cx,1611     mov    ax,01301h12     mov    bx,000ch13     mov    dl,014     int    10h15     ret16 BootMessage:    db    "Hello, OS World!"17 times    510-($-$$)    db    018 dw    0xaa55

Compile with NASM

nasm boot.asm -o boot.bin

Install bochs

Installation environment:

sudo apt-get install build-essential xorg-dev libgtk2.0-dev

 

Download and install the latest version from the official website.

 

./configure --enable-debugger --enable-disasmmakesudo make install

Prompt when making

/Usr/bin/ld: Gui/libgui. A (gtk_enh_dbg_osdep.o): Undefined reference to symbol' [email protected] @ glibc_2.1 '// lib/i386-linux-gnu/libpthread. so.0: error adding symbols: DSO missing from command linecollect2: Error: LD returned 1 exit statusmake: *** [bochs] Error 1

Solution

Add the following content to libs of makefile:

-lz -lrt -lm -lpthread 

Use bximage to generate a virtual floppy disk and write the Boot Sector to the virtual floppy disk:

dd if=boot.bin of=a.img bs=512 conv=notrunc

Configure bochs and then start

################################################################ Configuration file for Bochs################################################################ how much memory the emulated machine will have megs: 32# filename of ROM images romimage: file=/usr/local/share/bochs/BIOS-bochs-latest vgaromimage: file=/usr/local/share/bochs/VGABIOS-lgpl-latest# what disk images will be used floppya: 1_44=a.img, status=inserted# choose the boot disk. boot: floppy# where do we send log messages?# log: bochsout.txt# disable the mouse mouse: enabled=0# enable key mapping, using US layout as default. keyboard_mapping: enabled=1, map=/usr/local/share/bochs/keymaps/sdl-pc-us.map

 

The dump_cpu command is not available in the new bochs.