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added interruptor support

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This commit is contained in:
mrdudz 2015-09-19 15:55:43 +02:00
parent 859604407b
commit 296489ba6c
8 changed files with 80 additions and 41 deletions
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11
cfg/pce.cfg
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@ -38,10 +38,9 @@ FEATURES {
label = __DESTRUCTOR_TABLE__, label = __DESTRUCTOR_TABLE__,
count = __DESTRUCTOR_COUNT__, count = __DESTRUCTOR_COUNT__,
segment = RODATA; segment = RODATA;
# FIXME: interruptor support is missing CONDES: type = interruptor,
# CONDES: type = interruptor, label = __INTERRUPTOR_TABLE__,
# label = __INTERRUPTOR_TABLE__, count = __INTERRUPTOR_COUNT__,
# count = __INTERRUPTOR_COUNT__, segment = RODATA,
# segment = RODATA, import = __CALLIRQ__;
# import = __CALLIRQ__;
} }

1
libsrc/pce/clock.s
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@ -5,6 +5,7 @@
.include "pce.inc" .include "pce.inc"
.include "extzp.inc" .include "extzp.inc"
.forceimport ticktock
.export _clock .export _clock
.importzp sreg .importzp sreg

40
libsrc/pce/crt0.s
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@ -13,7 +13,7 @@
.import initlib, donelib .import initlib, donelib
.import push0, _main, zerobss .import push0, _main, zerobss
.import initheap .import initheap
.import tmp1,tmp2,tmp3 .import IRQStub
; Linker generated ; Linker generated
.import __RAM_START__, __RAM_SIZE__ .import __RAM_START__, __RAM_SIZE__
@ -30,6 +30,7 @@
.importzp sp .importzp sp
.importzp ptr1,ptr2 .importzp ptr1,ptr2
.importzp tmp1,tmp2,tmp3
; ------------------------------------------------------------------------ ; ------------------------------------------------------------------------
; Place the startup code in a special segment. ; Place the startup code in a special segment.
@ -158,39 +159,8 @@ _exit:
; reset the PCEngine (start over) ; reset the PCEngine (start over)
jmp start jmp start
; ------------------------------------------------------------------------
; System V-Blank Interupt
; FIXME: hooks should be provided so the user can abuse the IRQ
; ------------------------------------------------------------------------
_irq1:
pha
phx
phy
; increment the system tick counter
inc tickcount
bne @s1
inc tickcount + 1
bne @s1
inc tickcount + 2
bne @s1
inc tickcount + 3
@s1:
; Acknowlege interrupt
lda a:VDC_CTRL
ply
plx
pla
rti
_irq2:
rti
_nmi: _nmi:
rti rti
_timer:
stz IRQ_STATUS
rti
.export initmainargs .export initmainargs
initmainargs: initmainargs:
@ -201,8 +171,8 @@ initmainargs:
; ------------------------------------------------------------------------ ; ------------------------------------------------------------------------
.segment "VECTORS" .segment "VECTORS"
.word _irq2 ; $fff6 IRQ2 (External IRQ, BRK) .word IRQStub ; $fff6 IRQ2 (External IRQ, BRK)
.word _irq1 ; $fff8 IRQ1 (VDC) .word IRQStub ; $fff8 IRQ1 (VDC)
.word _timer ; $fffa Timer .word IRQStub ; $fffa Timer
.word _nmi ; $fffc NMI .word _nmi ; $fffc NMI
.word start ; $fffe reset .word start ; $fffe reset

1
libsrc/pce/extzp.inc
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@ -15,3 +15,4 @@
.global RVS: zp .global RVS: zp
.global BGCOLOR: zp .global BGCOLOR: zp
.global tickcount: zp .global tickcount: zp
.global vdc_flags: zp

1
libsrc/pce/extzp.s
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@ -15,3 +15,4 @@ CHARCOLOR: .res 1
RVS: .res 1 RVS: .res 1
BGCOLOR: .res 1 BGCOLOR: .res 1
tickcount: .res 4 tickcount: .res 4
vdc_flags: .res 1

48
libsrc/pce/irq.s Normal file
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@ -0,0 +1,48 @@
;
; IRQ handling (PCE version)
;
.export initirq, doneirq, IRQStub
.import __INTERRUPTOR_COUNT__, callirq_y
.include "pce.inc"
.include "extzp.inc"
; ------------------------------------------------------------------------
.segment "INIT"
; a constructor
;
initirq:
rts
; ------------------------------------------------------------------------
.code
; a destructor
;
doneirq:
rts
; ------------------------------------------------------------------------
IRQStub:
phy
; Save the display-source flags (and, release the interrupt).
;
ldy a:VDC_CTRL
sty vdc_flags
ldy #<(__INTERRUPTOR_COUNT__ * 2)
beq @L1
phx
pha
jsr callirq_y
pla
plx
@L1: ply
rti

18
libsrc/pce/ticktock.s Normal file
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@ -0,0 +1,18 @@
.interruptor ticktock, 24
.include "pce.inc"
.include "extzp.inc"
ticktock:
bbr5 vdc_flags,@s1 ; not vertical-blank interrupt
; Increment the system tick counter.
inc tickcount
bne @s1
inc tickcount+1
bne @s1
inc tickcount+2
bne @s1
inc tickcount+3
@s1: rts

1
libsrc/pce/waitvblank.s
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@ -5,6 +5,7 @@
.include "pce.inc" .include "pce.inc"
.include "extzp.inc" .include "extzp.inc"
.forceimport ticktock
.export _waitvblank .export _waitvblank
.proc _waitvblank .proc _waitvblank