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iTimeInt.asm
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.model small,c ;使用了c关键字,注意函数均不用加下划线
.386
extrn _int_Clock:near ptr byte,_int_countDown:near ptr byte,_int_Cursor:near ptr byte
.data
.code
public setNewVect
public retOldVect
public enable1CH
public disable1CH
new1ch:
pusha
push es
push ds
mov ax,cs:main_proc_ds
mov ds,ax
mov es,ax
JMP NEW1CH_MYCODE
main_proc_ds DW ?
old_int1ch dd 0ffffffffh
db 'luobingxxxxluobing'
NEW1CH_MYCODE:
call near ptr _int_Clock ;加上near ptr 很重要
call near ptr _int_Cursor
call near ptr _int_countDown
pop ds
pop es
popa
iret
;new1ch PROC FAR
; PUSHA
; PUSH DS
; PUSH ES
;
; JMP NEW1CH_MYCODE
; main_proc_ds DW ?
; old_int1ch dd 0ffffffffh
;NEW1CH_MYCODE:
; MOV AX,CS:MAIN_PROC_DS
; MOV DS,AX
; MOV ES,AX
; CLI
;
; call _int_Clock
; call _int_countDown
; call _int_Cursor
;
; STI
; ;防止中断被无意关闭，实际调试发现
; POP ES
; POP DS
; POPA
; IRET
;new1ch endp
;void setNewVect(unsigned int int_vect,unsigned int new_seg,unsigned int new_offs);
; 设置新的中断向量
; 旧向量保存在cs:old_int1ch中
setNewVect proc near
push bp
mov bp,sp
push ax
push bx
push cx
push es
cli
xor ax,ax
mov es,ax
mov al,4
mov cx,word ptr [bp+4]
mul cl
mov bx,ax ;es:[bx] ->int vect
;save old int
mov ax,word ptr es:[bx]
mov si,offset old_int1ch
mov word ptr cs:[si],ax
mov ax,word ptr es:[bx+2]
mov word ptr cs:[si+2],ax
;set new int
mov ax,word ptr [bp+8] ;offs
mov word ptr es:[bx],ax
mov ax,word ptr [bp+6] ;seg
mov word ptr es:[bx+2],ax
;pass ds value to int1c
push ds
pop ax
mov word ptr cs:main_proc_ds,ax
sti
pop es
pop cx
pop bx
pop ax
mov sp,bp
pop bp
ret
setNewVect endp
; unsigned int retOldVect(unsigned int vect)
; 还回以前的向量
; 0表示设置失败,没有设置新的向量
retOldVect proc near
push bp
mov bp,sp
push bx
push es
push ecx
push si
cli
mov bx,offset old_int1ch
xor ax,ax
mov ecx,dword ptr cs:[bx]
cmp ecx,0ffffffffh
jz _retOVexit
xor ecx,ecx
mov cx,word ptr [bp+4] ;vect
mov es,ax
mov al,4
mul cl
mov si,ax ;es:si -> vect int
mov ax,word ptr cs:[bx]
mov word ptr es:[si],ax
mov ax,word ptr cs:[bx+2]
mov word ptr es:[si+2],ax
;mov ecx,0ffffffffh
;mov dword ptr cs:[bx],ecx
mov word ptr cs:[bx],0ffffh
mov word ptr cs:[bx+2],0ffffh
mov ax,1
_retOVexit:
sti
pop si
pop ecx
pop es
pop bx
mov sp,bp
pop bp
ret
retOldVect endp
;unsigned int enable1CH(void)
enable1CH proc near
push bp
mov bp,sp
push bx
push ecx
;
mov bx,offset old_int1ch
xor ax,ax
mov ecx,dword ptr cs:[bx]
cmp ecx,0ffffffffh
jnz _enab1c_exit
mov ax,offset new1ch
;mov ax,offset i_int
push ax
push cs
mov ax,1ch
push ax
call setNewVect
add sp,6
mov ax,1
;
_enab1c_exit:
pop ecx
pop bx
mov sp,bp
pop bp
ret
enable1CH endp
;unsigned int disable1CH(void)
disable1CH proc near
push bp
mov bp,sp
;
mov ax,1ch
push ax
call retOldVect
add sp,2
;
mov sp,bp
pop bp
ret
disable1CH endp
end