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Change the sematics of callirq and the existing interruptors: The interrupts

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must now return carry set if the interrupt has been handled, and carry clear
if not. The callirq routine will stop calling handlers with the first handler
that claims to have handled the interrupt. callirq will return the carry flag
to the caller as it came from the last interruptor called.


git-svn-id: svn://svn.cc65.org/cc65/trunk@3491 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz 2005-04-25 20:10:10 +00:00
parent 2a688ef6fd
commit cbdcab4fdb
6 changed files with 39 additions and 16 deletions
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7
libsrc/c128/c128-1351.s
View File

@ -269,7 +269,9 @@ IOCTL: lda #<MOUSE_ERR_INV_IOCTL ; We don't support ioclts for now
;----------------------------------------------------------------------------
; IRQ: Irq handler entry point. Called as a subroutine but in IRQ context
; (so be careful).
; (so be careful). The routine MUST return carry set if the interrupt has been
; 'handled' - which means that the interrupt source is gone. Otherwise it
; MUST return carry clear.
;
IRQ: lda SID_ADConv1 ; Get mouse X movement
@ -355,10 +357,11 @@ IRQ: lda SID_ADConv1 ; Get mouse X movement
; Move the mouse pointer to the new X pos
tya
jmp CMOVEY
jsr CMOVEY
; Done
clc ; Interrupt not "handled"
@SkipY: rts
; --------------------------------------------------------------------------

9
libsrc/c128/c128-joymouse.s
View File

@ -269,7 +269,9 @@ IOCTL: lda #<MOUSE_ERR_INV_IOCTL ; We don't support ioclts for now
;----------------------------------------------------------------------------
; IRQ: Irq handler entry point. Called as a subroutine but in IRQ context
; (so be careful).
; (so be careful). The routine MUST return carry set if the interrupt has been
; 'handled' - which means that the interrupt source is gone. Otherwise it
; MUST return carry clear.
;
IRQ: lda #$7F
@ -381,9 +383,10 @@ IRQ: lda #$7F
; Move the mouse pointer to the new X pos
tya
jmp CMOVEY
jsr CMOVEY
; Done
@SkipY: rts
@SkipY: clc ; Interrupt not "handled"
rts

9
libsrc/c64/c64-1351.s
View File

@ -178,7 +178,7 @@ BOX: ldy #5
; MOVE: Move the mouse to a new position. The position is passed as it comes
; from the C program, that is: X on the stack and Y in a/x. The C wrapper will
; remove the parameter from the stack on return.
; No checks are done if the new position is valid (within the bounding box or
; No checks are done if the new position is valid (within the bounding box or
; the screen). No return code required.
;
@ -269,7 +269,9 @@ IOCTL: lda #<MOUSE_ERR_INV_IOCTL ; We don't support ioclts for now
;----------------------------------------------------------------------------
; IRQ: Irq handler entry point. Called as a subroutine but in IRQ context
; (so be careful).
; (so be careful). The routine MUST return carry set if the interrupt has been
; 'handled' - which means that the interrupt source is gone. Otherwise it
; MUST return carry clear.
;
IRQ: lda SID_ADConv1 ; Get mouse X movement
@ -355,10 +357,11 @@ IRQ: lda SID_ADConv1 ; Get mouse X movement
; Move the mouse pointer to the new X pos
tya
jmp CMOVEY
jsr CMOVEY
; Done
clc ; Interrupt not handled
@SkipY: rts
; --------------------------------------------------------------------------

8
libsrc/c64/c64-hitjoy.s
View File

@ -79,8 +79,10 @@ UNINSTALL:
rts
; ------------------------------------------------------------------------
; IRQ entry point. Is called from the C layer as a subroutine in the
; interrupt.
; IRQ entry point. Is called from the C layer as a subroutine in the
; interrupt. The routine MUST return carry set if the interrupt has been
; 'handled' - which means that the interrupt source is gone. Otherwise it
; MUST return carry clear.
IRQ: ; cia 2 setup
@ -156,6 +158,8 @@ fire:
lda #0
sta $dc04
; We do never "handle" the interrupt, we use it just as a timer.
clc
rts
; ------------------------------------------------------------------------

9
libsrc/c64/c64-joymouse.s
View File

@ -269,7 +269,9 @@ IOCTL: lda #<MOUSE_ERR_INV_IOCTL ; We don't support ioclts for now
;----------------------------------------------------------------------------
; IRQ: Irq handler entry point. Called as a subroutine but in IRQ context
; (so be careful).
; (so be careful). The routine MUST return carry set if the interrupt has been
; 'handled' - which means that the interrupt source is gone. Otherwise it
; MUST return carry clear.
;
IRQ: lda #$7F
@ -381,9 +383,10 @@ IRQ: lda #$7F
; Move the mouse pointer to the new X pos
tya
jmp CMOVEY
jsr CMOVEY
; Done
@SkipY: rts
@SkipY: clc ; Interrupt not handled
rts

13
libsrc/runtime/callirq.s
View File

@ -16,6 +16,11 @@
; code avoids this by using locking mechanisms, but it's complex and
; has a size and performance penalty.
;
; 3. Special semantics: An interruptor called by callirq must tell by
; setting or resetting the carry flag if the interrupt has been handled
; (which means that the interrupt is no longer active at the interrupt
; source). callirq will call no other interruptors if this happens.
;
; As the normal condes routine, this one has the limitation of 127 table
; entries.
;
@ -29,7 +34,9 @@
; --------------------------------------------------------------------------
; Call all IRQ routines. The function needs to use self modifying code and
; is thereforce placed in the data segment.
; is thereforce placed in the data segment. It will return carry set if the
; interrupt was handled and carry clear if not. The caller may choose to
; ignore this at will.
; NOTE: The routine must not be called if the table is empty!
.data
@ -45,9 +52,9 @@ callirq_y:
sta jmpvec+1 ; Modify code below
sty index+1 ; Modify code below
jmpvec: jsr $FFFF ; Patched at runtime
bcs done ; Bail out if interrupt handled
index: ldy #$FF ; Patched at runtime
bne callirq_y
rts
done: rts