驅動程式 - MS-DOS Device Driver (MDD) - 使用範例 - Assembly (MASM) - Hello, world!

main.asm

cseg segment para public 'code'
MyDriver proc far
    assume cs:cseg, es:cseg, ds:cseg

    NextDriver  dd -1
    Attribute   dw 8000h
    Strategy    dw MyStrategy
    Interrupt   dw MyInterrupt
    DriverName  db 'MyDriver'

    RhOffset    dw ?
    RhSegment   dw ?
    bootmsg     db 'Hello, world!', 0dh, 0ah, '$'
    CmdTable    dw Init

MyStrategy:
    mov cs:RhSegment, es
    mov cs:RhOffset, bx
    ret

MyInterrupt:
    cld
    push ds
    push es
    push ax
    push bx
    push cx
    push dx
    push di
    push si

    mov al, es:[bx]+2
    cmp al, 0
    jnz SkipCurRequest
    rol al, 1
    lea di, CmdTable
    mov ah, 0
    add di, ax
    jmp word ptr[di]

Init:
    lea dx, bootmsg
    mov ah, 9
    int 21h
    lea ax, Exit
    mov es:[bx]+0eh, ax
    push cs
    pop ax
    mov es:[bx]+10h, ax
    mov es:word ptr 3[bx], 0100h
    jmp CompleteCmd

SkipCurRequest:
    mov es:word ptr 3[bx], 8103h
    jmp CompleteCmd

CompleteCmd:
    mov bx, cs:RhOffset
    mov es, cs:RhSegment
    pop si
    pop di
    pop dx
    pop cx
    pop bx
    pop ax
    pop es
    pop ds
    ret

Exit:
MyDriver endp
cseg ends
end

編譯

C:> masm main.asm
C:> link main.obj
C:> exe2bin main.exe

P.S. 編譯程式記得在C:\編譯

開機自動載入驅動程式


使用Pause讓命令暫停執行，避免Debug Log被洗掉


完成


使用mem /d | more就可以看到MyDriver驅動程式