操作系统学习--day1

1.编写引导程序

org    0x7c00                    ;将程序装载到指定的内存地址
jmp    entry

entry:
;初始化ds,es段寄存器
    mov    ax,cs
    mov    ds,ax
    mov    es,ax
;13号中断：显示字符串
;字符串地址：es:bp
;字符串长度:cs
;起始行列:dh,dl
;页码属性：bh,bl
    mov    ax,msg
    mov    bp,ax
    mov    cx,26
    mov    ax,0x1301
    mov    bx,000ch
    mov    dl,0
    int 10h

msg    db    ‘This is program by myself!‘
    times    510-($-$$)    db 0
    dw 0xaa55