page ,132
; masm tisr ; >err
.286p
.xlist
include bogus.inc
include pic.h
.list
WM_COMMAND = 0111h
EXTRN POSTMESSAGE:FAR
Words struc
LoWord dw ?
HiWord dw ?
Words ends
;
; Set variables for our interrupt number
;
ife (FAKE_IRQ GE 8)
INT_DEV equ (INT_MASTER_0+(FAKE_IRQ AND 7))
PIC00 equ INTA00
PIC01 equ INTA01
else
INT_DEV equ (INT_SLAVE_0+(FAKE_IRQ AND 7))
INT_MASK equ 1 SHL (FAKE_IRQ AND 7)
PIC00 equ INTB00
PIC01 equ INTB01
endif
page
FIXED_DATA SEGMENT DWORD PUBLIC 'DATA'
PUBLIC_hWndEvent,_wParamEvent,_wCount
_hWndEvent label word
hWndEvent dw 0 ; Window to post events to
_wParamEvent label word
wParamEvent dw 0 ; wParam value to post
_wCount label word
wCount dw 0 ; count of unprocessed interrupts
FIXED_DATA ENDS
page
;IP IntSvcRtn - The Interrupt Service Routine
;
; WARNINGS
;
; NOTES
; This ISR increments a count and re-arms the device.
; If the count was previously zero, a message is posted.
;
; If the "fStopping" flag is set, the device is not re-armed.
;
FIXED_TEXT SEGMENT PARA PUBLIC 'CODE'
selData1 dw FIXED_DATA
assume CS:FIXED_TEXT,DS:NOTHING
PUBLIC _IntSvcRtn
_IntSvcRtn label far
IntSvcRtn proc far
push ax
push dx
push ds
mov ds,selData1
assume ds:FIXED_DATA
inc wCount
mov al,NOT FAKE_CTL_EOI
mov dx,FAKE_PORT
out dx,al ; send EOI to device
mov al,EOI
out PIC00,al ; send EOI to PIC
ife (PIC00 EQ INTA00)
out INTA00,al ; send EOI to master PIC, too
endif
cmp hWndEvent,0 ; exiting?
jz isr9 ; if so, then don't restart or port
cmp wCount,1 ; Need to post?
jne isr8 ; skip if not
push bx ; save the remaining registers
push cx
push es
push hWndEvent
push WM_COMMAND
push wParamEvent
push 0 ; lParam is zero
push 0
call POSTMESSAGE ; post the event
pop es
pop cx
pop bx
isr8:
mov al,NOT FAKE_CTL_START
mov dx,FAKE_PORT
out dx,al ; restart I/O
isr9:
pop ds
assume ds:NOTHING
pop dx
pop ax
iret
IntSvcRtn endp
; Needed by AllocIntReflector
PUBLIC _BogusCallback
_BogusCallback label far
BogusCallback proc far
pushf
call IntSvcRtn
ret
BogusCallback endp
FIXED_TEXT ENDS
end
; End of File