《Linux内核完全剖析——基于0.12内核》第3章P31 引导扇区源代码boot.s

.globl begtext,begdata,begbss,endtext,enddata,endbss
.text
begtext:
.data
begdata:
.bss
begbss:
.text
BOOTSEG=0x07c0

entry start
start:
jmpi go,BOOTSEG
go: mov ax,cs
mov ds,ax
mov es,ax
mov [msg1+17],ah
mov cx,#20
mov dx,#0x1004
mov bx,#0x000c
mov bp,#msg1
mov ax,#0x1301
int 0x10
loop0: jmp loop0
msg1: .ascii "Loading system..."
.byte 13,10
.org 510
.word 0xAA55
.text
endtext:
.data
enddata:
.bss
endbss: