58 lines
1.2 KiB
NASM
58 lines
1.2 KiB
NASM
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;将程序开始位置设置为0x7c00处，并给BaseOfStack赋值为0x7c00
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org 0x7c00
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BaseOfStack equ 0x7c00
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Label_Start:
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;初始化寄存器
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mov ax, cs
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mov ds, ax
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mov es, ax
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mov ss, ax
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mov sp, BaseOfStack
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;清屏
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mov ax, 0x0600 ;AL=0时，清屏，BX、CX、DX不起作用
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mov bx, 0x0700 ;设置白色字体，不闪烁，字体正常亮度，黑色背景
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mov cx, 0
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mov dx, 0184fh
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int 10h
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;设置屏幕光标位置为左上角(0,0)的位置
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mov ax, 0x0200
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mov bx, 0x0000
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mov dx, 0x0000
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int 10h
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;在屏幕上显示Start Booting
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mov ax, 0x1301 ;设置显示字符串，显示后，光标移到字符串末端
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mov bx, 0x000f ;设置黑色背景，白色字体，高亮度，不闪烁
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mov dx, 0x0000 ;设置游标行列号均为0
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mov cx, 10 ;设置字符串长度为10
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;为什么这里不能直接把ds赋值给es？
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push ax
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mov ax, ds
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mov es, ax
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pop ax
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mov bp, StartBootMessage
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int 10h
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;软盘驱动器复位
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xor ah, ah
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xor dl, dl
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int 13h
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jmp $
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StartBootMessage: db "Start Boot"
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;填满整个扇区的512字节
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times 510 - ( $ - $$ ) db 0
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dw 0xaa55 ;===确保以0x55 0xaa为结尾
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