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我想用nasm来改写linux 0.11中的bootsect.s,我只写了一点就出问题了,请看:
;引导程序bootsect.asm
[BITS 16]
[ORG 0x07C00]
jmp start
BOOTSEG EQU 0x07c0
INITSEG EQU 0x9000
start:
;把启动时的引导程序从0x07c0:0复制到0x9000:0,共512个字节
mov ax,BOOTSEG
mov ds,ax
mov ax,INITSEG
mov es,ax
mov cx,20
sub si,si
sub di,di
rep
movsw
nop
nop
jmp INITSEG:go ;跳转到0x9000:go的位置
go: mov ax,cs
mov ds,ax
mov es,ax
mov ss,ax
mov sp,0xFF00
nop
nop
call DispStr
jmp $
DispStr:
mov ax,BootMessage
mov bp,ax
mov cx,16
mov ax,01301h
mov bx,000ch
mov dl,0
int 10h
ret
BootMessage:db"Hello, OS world!"
times 510-($-$$) db 0
dw 0xaa55
我是在linux下用bochs来模拟的,我编译nasm bootsect.asm -o bootsect.bin,然后用bochs来启动,
我调式时,发现jmp INITSEG:go 就出问题了,好像偏移地址不对了,并且mov ax,BootMessage的
偏移地址也不对,它们都不是从0开始计算的,请问有什么办法解决呢?
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