1. bximage: 生成磁盘映像
bximage
2. nasm: 生成.bin文件
org 07c00h ; 告诉编译器程序加载到7c00处
mov ax, cs
mov ds, ax
mov es, ax
call DispStr ; 调用显示字符串例程
jmp $ ; 无限循环
DispStr:
mov ax, BootMessage
mov bp, ax ; ES:BP = 串地址
mov cx, 16 ; CX = 串长度
mov ax, 01301h ; AH = 13, AL = 01h
mov bx, 000ch ; 页号为0(BH = 0) 黑底红字(BL = 0Ch,高亮)
mov dl, 0
int 10h ; 10h 号中断
ret
BootMessage: db "Hello, OS world!"
times 510-($-$$) db 0 ; 填充剩下的空间,使生成的二进制代码恰好为512字节
dw 0xaa55 ; 结束标志
nasm boot.asm -o boot.bin
3. 将引导扇区写进软盘
dd if=boot.bin of=a.img bs=512 count=1 conv=notrunc
4. 编写bochs配置文件
###############################################################
# Configuration file for Bochs
###############################################################
# how much memory the emulated machine will have
megs: 32
# filename of ROM images
romimage: file=/usr/share/bochs/BIOS-bochs-latest
vgaromimage: file=/usr/share/bochs/VGABIOS-lgpl-latest
# what disk images will be used
floppya: image="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: keymap=/usr/share/bochs/keymaps/x11-pc-us.map
5. 启动bochs
bochs -f bochsrc
需要特别注意的是, 在启动后, 需要输入c并回车, 否则会显示黑屏