136 lines
3.0 KiB
PHP
136 lines
3.0 KiB
PHP
;**************************************
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;* IRQ HANDLER FOR PS/2 MOUSE *
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;**************************************
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proc irq_handler
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call Wait8042BufferEmpty ;clear buffer
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in al,0x60 ;get scan-code
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cmp [mouse_byte],0
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je .byte1
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cmp [mouse_byte],1
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je .byte2
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cmp [mouse_byte],2
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je .byte3
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cmp [mouse_byte],3
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je .byte4
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jmp .error
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.byte1:
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test al,1000b ;first byte?
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jz .error
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mov [first_byte],al
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inc [mouse_byte]
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jmp .exit
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.byte2:
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mov [second_byte],al
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inc [mouse_byte]
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jmp .exit
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.byte3:
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mov [third_byte],al
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cmp [MouseType],MT_3B
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je .full_packet
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inc [mouse_byte]
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jmp .exit
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.byte4:
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mov [fourth_byte],al
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.full_packet:
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mov [mouse_byte],0
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mov al,byte [first_byte]
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and eax,7
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mov byte [ButtonState],al
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cmp [MouseType],MT_3B
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je .xy_moving
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mov al,[fourth_byte]
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cmp [MouseType],MT_3BScroll
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je .z_moving
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mov ah,al
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and ah,00110000b
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shr ah,1
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or byte [ButtonState],ah
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and al,00001111b
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bt eax,3
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jnc .z_moving
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or al,11110000b
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.z_moving:
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movsx eax,al
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mov [ZMoving],eax
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.xy_moving:
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mov ah,0
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mov al,[first_byte]
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test al,10000b
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jz @f
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mov ah,0FFh
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@@:
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mov al,[second_byte]
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cwde
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mov [XMoving],eax
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mov ah,0
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mov al,[first_byte]
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test al,100000b
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jz @f
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mov ah,0FFh
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@@:
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mov al,[third_byte]
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cwde
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@@:
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mov [YMoving],eax
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mov eax,[ZMoving]
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test eax,1
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jnz .vert
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sar eax,1
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push eax
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push 0
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jmp @f
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.vert:
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push 0
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push eax
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@@:
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stdcall SetMouseData, [ButtonState], [XMoving], [YMoving]
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jmp .exit
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.error:
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mov [mouse_byte],0
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.exit:
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ret
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endp
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;***********************************************
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;* Waiting for clearing I8042 buffer *
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;* Retutned state: *
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;* ZF is set - good ending, *
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;* ZF is cleared - time-out error. *
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;***********************************************
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Wait8042BufferEmpty:
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push ecx
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xor ecx,ecx
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@@:
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in al,64h
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test al,00000010b
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loopnz @b
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pop ecx
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ret
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