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cc65/libsrc/atari/irq.s

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Moved IRQ hooking / unhooking from startup code to constructor / destructor to avoid linking in the hooking / unhooking code (and callirq) for the majority of cc65 prorams not linking in interruptors. git-svn-id: svn://svn.cc65.org/cc65/trunk@5985 b7a2c559-68d2-44c3-8de9-860c34a00d81
2013-02-12 22:39:38 +00:00
;
; IRQ handling (ATARI version)
;
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
.export initirq, doneirq
.import callirq
Moved IRQ hooking / unhooking from startup code to constructor / destructor to avoid linking in the hooking / unhooking code (and callirq) for the majority of cc65 prorams not linking in interruptors. git-svn-id: svn://svn.cc65.org/cc65/trunk@5985 b7a2c559-68d2-44c3-8de9-860c34a00d81
2013-02-12 22:39:38 +00:00
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
.include "atari.inc"
adapt to CHARGEN_RELOC
2013-09-20 16:09:53 +00:00
.ifdef __ATARIXL__
.import __CHARGEN_START__
.include "romswitch.inc"
.endif
Moved IRQ hooking / unhooking from startup code to constructor / destructor to avoid linking in the hooking / unhooking code (and callirq) for the majority of cc65 prorams not linking in interruptors. git-svn-id: svn://svn.cc65.org/cc65/trunk@5985 b7a2c559-68d2-44c3-8de9-860c34a00d81
2013-02-12 22:39:38 +00:00
; ------------------------------------------------------------------------
Renamed INITBSS to INIT and INIT to ONCE. The way we want to use the INITBSS segment - and especially the fact that it won't have the type bss on all ROM based targets - means that the name INITBSS is misleading. After all INIT is the best name from my perspective as it serves several purposes and therefore needs a rather generic name. Unfortunately this means that the current INIT segment needs to be renamed too. Looking for a short (ideally 4 letter) name I came up with ONCE as it contains all code (and data) accessed only once during initialization.
2016-03-06 20:26:22 +00:00
.segment "ONCE"
Moved IRQ hooking / unhooking from startup code to constructor / destructor to avoid linking in the hooking / unhooking code (and callirq) for the majority of cc65 prorams not linking in interruptors. git-svn-id: svn://svn.cc65.org/cc65/trunk@5985 b7a2c559-68d2-44c3-8de9-860c34a00d81
2013-02-12 22:39:38 +00:00
initirq:
Atari: fix interrupt handling if extended memory is banked in Extendend memory is mapped over the main memory in the 0x4000..0x7FFF area. Many DOSes disable interrupts while extended memory is banked in, but not all (e.g. SpartaDOS-X). This change modifies the initial interrupt handler to map in main memory before chaining to the "worker" handlers. Since the initial interrupt handler uses a data segment to store the trampoline to chain to the original handler, introduce a new "LOWBSS" segment to hold this trampoline. Otherwise the trampoline may end up inside the 0x4000..0x7FFF area. Add a link time warning if "LOWCODE" segment lays within the extended memory window.
2018-09-02 21:07:03 +00:00
lda #$4C ; JMP opcode
sta IRQInd
Use deferred VBI instead of immediate VBI. A deferred VBI won't be called if the user program has interrupts disabled which makes it easier to avoid race conditions.
2014-01-02 20:45:12 +00:00
lda VVBLKD
ldx VVBLKD+1
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
sta IRQInd+1
stx IRQInd+2
Use deferred VBI instead of immediate VBI. A deferred VBI won't be called if the user program has interrupts disabled which makes it easier to avoid race conditions.
2014-01-02 20:45:12 +00:00
lda #7
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
ldy #<IRQStub
ldx #>IRQStub
small optimization
2014-05-26 23:49:35 +00:00
jmp SETVBV
Moved IRQ hooking / unhooking from startup code to constructor / destructor to avoid linking in the hooking / unhooking code (and callirq) for the majority of cc65 prorams not linking in interruptors. git-svn-id: svn://svn.cc65.org/cc65/trunk@5985 b7a2c559-68d2-44c3-8de9-860c34a00d81
2013-02-12 22:39:38 +00:00
; ------------------------------------------------------------------------
.code
doneirq:
Use deferred VBI instead of immediate VBI. A deferred VBI won't be called if the user program has interrupts disabled which makes it easier to avoid race conditions.
2014-01-02 20:45:12 +00:00
lda #7
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
ldy IRQInd+1
ldx IRQInd+2
small optimization
2014-05-26 23:49:35 +00:00
jmp SETVBV
Moved IRQ hooking / unhooking from startup code to constructor / destructor to avoid linking in the hooking / unhooking code (and callirq) for the majority of cc65 prorams not linking in interruptors. git-svn-id: svn://svn.cc65.org/cc65/trunk@5985 b7a2c559-68d2-44c3-8de9-860c34a00d81
2013-02-12 22:39:38 +00:00
; ------------------------------------------------------------------------
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
.segment "LOWCODE"
Moved IRQ hooking / unhooking from startup code to constructor / destructor to avoid linking in the hooking / unhooking code (and callirq) for the majority of cc65 prorams not linking in interruptors. git-svn-id: svn://svn.cc65.org/cc65/trunk@5985 b7a2c559-68d2-44c3-8de9-860c34a00d81
2013-02-12 22:39:38 +00:00
IRQStub:
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
cld ; Just to be sure
Use '.ifdef' and '.ifndef' instead of '.if .defined' and '.if .not .defined'.
2013-09-19 20:36:22 +00:00
.ifdef __ATARIXL__
adapt to CHARGEN_RELOC
2013-09-20 16:09:53 +00:00
.ifdef CHARGEN_RELOC
lda CHBAS
pha
Atari: fix interrupt handling if extended memory is banked in Extendend memory is mapped over the main memory in the 0x4000..0x7FFF area. Many DOSes disable interrupts while extended memory is banked in, but not all (e.g. SpartaDOS-X). This change modifies the initial interrupt handler to map in main memory before chaining to the "worker" handlers. Since the initial interrupt handler uses a data segment to store the trampoline to chain to the original handler, introduce a new "LOWBSS" segment to hold this trampoline. Otherwise the trampoline may end up inside the 0x4000..0x7FFF area. Add a link time warning if "LOWCODE" segment lays within the extended memory window.
2018-09-02 21:07:03 +00:00
.endif
adapt to CHARGEN_RELOC
2013-09-20 16:09:53 +00:00
.endif
lda PORTB
pha
Atari: fix interrupt handling if extended memory is banked in Extendend memory is mapped over the main memory in the 0x4000..0x7FFF area. Many DOSes disable interrupts while extended memory is banked in, but not all (e.g. SpartaDOS-X). This change modifies the initial interrupt handler to map in main memory before chaining to the "worker" handlers. Since the initial interrupt handler uses a data segment to store the trampoline to chain to the original handler, introduce a new "LOWBSS" segment to hold this trampoline. Otherwise the trampoline may end up inside the 0x4000..0x7FFF area. Add a link time warning if "LOWCODE" segment lays within the extended memory window.
2018-09-02 21:07:03 +00:00
.ifdef __ATARIXL__
and #$FE ; disable ROM
.endif
ora #$10 ; map main memory into $4000..$7FFF area
sta PORTB
.ifdef __ATARIXL__
adapt to CHARGEN_RELOC
2013-09-20 16:09:53 +00:00
set_chbase >__CHARGEN_START__
atarixl target: add support for interruptors, adapt TGI drivers
2013-08-25 09:20:27 +00:00
.endif
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
jsr callirq ; Call the functions
adapt to CHARGEN_RELOC
2013-09-20 16:09:53 +00:00
pla
Atari: fix interrupt handling if extended memory is banked in Extendend memory is mapped over the main memory in the 0x4000..0x7FFF area. Many DOSes disable interrupts while extended memory is banked in, but not all (e.g. SpartaDOS-X). This change modifies the initial interrupt handler to map in main memory before chaining to the "worker" handlers. Since the initial interrupt handler uses a data segment to store the trampoline to chain to the original handler, introduce a new "LOWBSS" segment to hold this trampoline. Otherwise the trampoline may end up inside the 0x4000..0x7FFF area. Add a link time warning if "LOWCODE" segment lays within the extended memory window.
2018-09-02 21:07:03 +00:00
sta PORTB ; restore old memory settings
.ifdef __ATARIXL__
adapt to CHARGEN_RELOC
2013-09-20 16:09:53 +00:00
.ifdef CHARGEN_RELOC
pla
sta CHBAS
sta CHBASE
.endif
atarixl target: add support for interruptors, adapt TGI drivers
2013-08-25 09:20:27 +00:00
.endif
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
jmp IRQInd ; Jump to the saved IRQ vector
Moved IRQ hooking / unhooking from startup code to constructor / destructor to avoid linking in the hooking / unhooking code (and callirq) for the majority of cc65 prorams not linking in interruptors. git-svn-id: svn://svn.cc65.org/cc65/trunk@5985 b7a2c559-68d2-44c3-8de9-860c34a00d81
2013-02-12 22:39:38 +00:00
; ------------------------------------------------------------------------
Atari: fix interrupt handling if extended memory is banked in Extendend memory is mapped over the main memory in the 0x4000..0x7FFF area. Many DOSes disable interrupts while extended memory is banked in, but not all (e.g. SpartaDOS-X). This change modifies the initial interrupt handler to map in main memory before chaining to the "worker" handlers. Since the initial interrupt handler uses a data segment to store the trampoline to chain to the original handler, introduce a new "LOWBSS" segment to hold this trampoline. Otherwise the trampoline may end up inside the 0x4000..0x7FFF area. Add a link time warning if "LOWCODE" segment lays within the extended memory window.
2018-09-02 21:07:03 +00:00
.segment "LOWBSS"
IRQInd: .res 3
Moved IRQ hooking / unhooking from startup code to constructor / destructor to avoid linking in the hooking / unhooking code (and callirq) for the majority of cc65 prorams not linking in interruptors. git-svn-id: svn://svn.cc65.org/cc65/trunk@5985 b7a2c559-68d2-44c3-8de9-860c34a00d81
2013-02-12 22:39:38 +00:00
Atari: fix interrupt handling if extended memory is banked in Extendend memory is mapped over the main memory in the 0x4000..0x7FFF area. Many DOSes disable interrupts while extended memory is banked in, but not all (e.g. SpartaDOS-X). This change modifies the initial interrupt handler to map in main memory before chaining to the "worker" handlers. Since the initial interrupt handler uses a data segment to store the trampoline to chain to the original handler, introduce a new "LOWBSS" segment to hold this trampoline. Otherwise the trampoline may end up inside the 0x4000..0x7FFF area. Add a link time warning if "LOWCODE" segment lays within the extended memory window.
2018-09-02 21:07:03 +00:00
.end
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