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我的系統(tǒng)為redhat9
首先去bochs的官網(wǎng)
http://bochs./
下載最新的程序,，我直接下的是bochs-2.4.tar.gz
tar zxvf bochs-2.4.tar.gz
./configure
如果要調(diào)試功能的話(huà),，可查看configure文件做相應(yīng)調(diào)整
 --enable-debugger                 compile in support for Bochs internal debugger
  --enable-disasm                   compile in support for disassembler
  --enable-debugger-gui             compile in support for Bochs internal debugger GUI
  --with-sdl                        use SDL libraries
網(wǎng)上說(shuō)要加最后一個(gè)暫時(shí)沒(méi)有明白其意。
make
./bochs  運(yùn)行

BOCHS運(yùn)行需要.bochsrc文件,在LINUX下以.開(kāi)頭的文件都是隱藏文件
l. 可查看這些文件,。
vi .bochsrc
# how much memory the emulated machine will have
megs: 32

# filename of ROM images
romimage:file=$BXSHARE/BIOS-bochs-latest
#注意上面這一行,，2.3.5以后的后面不能加,address=0xf0000  否則會(huì)出現(xiàn)
#Message: ROM: System BIOS must end at 0xfffff 錯(cuò)誤的  這個(gè)后面會(huì)解釋
#romimage: file=mybios.bin, address=0xfff80000 # 512k at memory top

vgaromimage: file=$BXSHARE/VGABIOS-lgpl-latest
                                                                               
# what disk images will be used
floppya: 1_44=hello.img, status=inserted

#ata0-master: type=disk, mode=flat, path="30M.sample"

# hard disk
#ata0: enabled=1, ioaddr1=0x1f0, ioaddr2=0x3f0, irq=14
#ata1: enabled=1, ioaddr1=0x170, ioaddr2=0x370, irq=15
#ata2: enabled=0, ioaddr1=0x1e8, ioaddr2=0x3e0, irq=11
#ata3: enabled=0, ioaddr1=0x168, ioaddr2=0x360, irq=9

boot: floppy
#boot: disk

megs: 32 是說(shuō)內(nèi)存是32M
floppya: 1_44=a.img, status=inserted 指定了軟盤(pán)映像文件
boot: floppy 從軟盤(pán)啟動(dòng)。

從http://bochs./下載nasm
我下的是nasm-2.05.01.tar.gz 
tar zxvf nasm-2.05.01.tar.gz
cd nasm-2.05.01
./configure
make
make install

mkdir helloworld
cd helloworld
vi hello.asm
;hello.asm
org 07c00h
                                                                               
LABEL_START:
        mov ax,cs
        mov ds,ax
        mov es,ax
        mov ax,0b800h
        mov gs,ax
        mov ah,0ch
        mov al,'H'
        mov [gs:0],ax
        jmp $

./nasm ./helloworld/hello.asm  -o ./helloworld/hello.bin

進(jìn)入bochs目錄
./bximage
========================================================================
                                bximage
                  Disk Image Creation Tool for Bochs
        $Id: bximage.c,v 1.34 2009/04/14 09:45:22 sshwarts Exp $
========================================================================
 
Do you want to create a floppy disk image or a hard disk image?
Please type hd or fd. [hd] fd
 
Choose the size of floppy disk image to create, in megabytes.
Please type 0.16, 0.18, 0.32, 0.36, 0.72, 1.2, 1.44, 1.68, 1.72, or 2.88.
 [1.44]
I will create a floppy image with
  cyl=80
  heads=2
  sectors per track=18
  total sectors=2880
  total bytes=1474560
 
What should I name the image?
[a.img] hello.img
 
Writing: [] Done.
 
I wrote 1474560 bytes to hello.img.
 
The following line should appear in your bochsrc:
  floppya: image="hello.img", status=inserted

把bin寫(xiě)入img中
dd if=/nasm-2.05.01/helloworld/hello.bin of=hello.img bs=512 count=1 conv=notrunc
讀入了 0+1 個(gè)塊
輸出了 0+1 個(gè)塊

bochs -q -f .bochsrc 運(yùn)行我們的OS
出現(xiàn)如下錯(cuò)誤
Bochs is exiting with the following message:
[BIOS ] No bootable device.

查看生成的hello.bin大小
ls -al hello.bin
-rw-r--r--    1 root     900            22  5月 20 11:45 hello.bin
大小為22byte
我們要把它們弄成512byte的
在hello.asm最后添加
times 510-($-$$) db 0 ; 填充剩下的空間,，使生成的二進(jìn)制代碼恰好為512字節(jié)
dw        0xaa55      ;這個(gè)是結(jié)束標(biāo)志符
再用nasm編譯生成hello.bin
再寫(xiě)入到hello.img便可以了,。
然后執(zhí)行
bochs -q -f .bochsrc
便可以看到紅色的H字樣了

ps:
若出現(xiàn)Message: ROM: System BIOS must end at 0xfffff 錯(cuò)誤的原因如下：
In previous versions of Bochs the BIOS size was 64k and you always had to
specify the start address at 0xf0000. Starting with release 2.2.5 Bochs
supports BIOS images up to 512k and it's no longer necessary to specify the
start address if the BIOS ends at memory top
就是不要再指定address了。

當(dāng)然要顯示Hello world可用以下這個(gè)
org 07c00h
mov        ax, cs;數(shù)據(jù)傳送指令,，將代碼段寄存器cs的內(nèi)容賦給通用寄存器ax
mov        ds, ax;使數(shù)據(jù)段與代碼段在同一個(gè)段
mov        es, ax;使附加段與代碼段在同一個(gè)段
call        DispStr
jmp        $ ;$表示當(dāng)前地址,無(wú)限循環(huán)
DispStr:
mov        ax, BootMessage
mov        bp, ax ;es:bp=串地址
mov        cx, 15 ;串長(zhǎng)度
mov        ax, 01301h  ;ah=13h, al=01h 視頻中斷13h號(hào)功能：寫(xiě)字符串,；AL=01H，表示寫(xiě)完字符串后,，更新光標(biāo)位置
mov        bx, 000ch   ;頁(yè)號(hào)為0(bh=0) 黑底紅字(bl=0ch,高亮)
mov        dl, 0 ;DH,、DL=寫(xiě)串的光標(biāo)位置,，DH=行號(hào),，DL=列號(hào)
int        10h
ret
BootMessage:        db "Hello,World OS!"
times 510-($-$$) db 0 ; 填充剩下的空間，使生成的二進(jìn)制代碼恰好為512字節(jié)
dw        0xaa55

times 510-($-$$) db 0
This reads: Times 510-(Start of this Instruction - Start of program) with 0's
$ stands for start of the instruction
$$ stands for start of the program
dw 0xAA55

For some reason the signature has to be written this way round!
This fills the last to bytes of the boot loader with 55AA (this is a hex number)
Without this signature the BIOS won't recognise this as a bootable disk!