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cc65/libsrc/apple2/extra/iobuf-0800.s

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Added alternative implementation for ProDOS 8 I/O buffer management. The purpose of this implementation is to avoid pulling in the heap stuff (and especially the C-written posix_memalign() function) into small file utility-like applications. It saves in this scenario > 1400 Bytes. It manages memory blocks between $0800 and the cc65 start address. This is especially usefull for the now supported "native" SYS programs starting at $2000. git-svn-id: svn://svn.cc65.org/cc65/trunk@4210 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-09-22 17:29:49 +00:00
;
; Oliver Schmidt, 15.09.2009
;
; ProDOS 8 I/O buffer management for memory between
; location $0800 and the cc65 program start address
;
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
.constructor initiobuf
.export iobuf_alloc, iobuf_free
.import __STARTUP_RUN__
.import incsp2, popax
Added alternative implementation for ProDOS 8 I/O buffer management. The purpose of this implementation is to avoid pulling in the heap stuff (and especially the C-written posix_memalign() function) into small file utility-like applications. It saves in this scenario > 1400 Bytes. It manages memory blocks between $0800 and the cc65 start address. This is especially usefull for the now supported "native" SYS programs starting at $2000. git-svn-id: svn://svn.cc65.org/cc65/trunk@4210 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-09-22 17:29:49 +00:00
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
.include "zeropage.inc"
.include "errno.inc"
.include "../filedes.inc"
Added alternative implementation for ProDOS 8 I/O buffer management. The purpose of this implementation is to avoid pulling in the heap stuff (and especially the C-written posix_memalign() function) into small file utility-like applications. It saves in this scenario > 1400 Bytes. It manages memory blocks between $0800 and the cc65 start address. This is especially usefull for the now supported "native" SYS programs starting at $2000. git-svn-id: svn://svn.cc65.org/cc65/trunk@4210 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-09-22 17:29:49 +00:00
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
.segment "INIT"
Added alternative implementation for ProDOS 8 I/O buffer management. The purpose of this implementation is to avoid pulling in the heap stuff (and especially the C-written posix_memalign() function) into small file utility-like applications. It saves in this scenario > 1400 Bytes. It manages memory blocks between $0800 and the cc65 start address. This is especially usefull for the now supported "native" SYS programs starting at $2000. git-svn-id: svn://svn.cc65.org/cc65/trunk@4210 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-09-22 17:29:49 +00:00
initiobuf:
; Convert end address highbyte to table index
We now don't define the memory area RAM anymore. So use the segment STARTUP - as done in crt0.s. git-svn-id: svn://svn.cc65.org/cc65/trunk@5729 b7a2c559-68d2-44c3-8de9-860c34a00d81
2012-06-16 22:58:03 +00:00
lda #>__STARTUP_RUN__
Added alternative implementation for ProDOS 8 I/O buffer management. The purpose of this implementation is to avoid pulling in the heap stuff (and especially the C-written posix_memalign() function) into small file utility-like applications. It saves in this scenario > 1400 Bytes. It manages memory blocks between $0800 and the cc65 start address. This is especially usefull for the now supported "native" SYS programs starting at $2000. git-svn-id: svn://svn.cc65.org/cc65/trunk@4210 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-09-22 17:29:49 +00:00
sec
sbc #>$0800
lsr
lsr
; Mark all remaining table entries as used
tax
lda #$FF
Fixed bug triggered if all 8 io buffer slots may be used. git-svn-id: svn://svn.cc65.org/cc65/trunk@4242 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-09-26 21:32:05 +00:00
: cpx #MAX_FDS
bcc :+
rts
Added alternative implementation for ProDOS 8 I/O buffer management. The purpose of this implementation is to avoid pulling in the heap stuff (and especially the C-written posix_memalign() function) into small file utility-like applications. It saves in this scenario > 1400 Bytes. It manages memory blocks between $0800 and the cc65 start address. This is especially usefull for the now supported "native" SYS programs starting at $2000. git-svn-id: svn://svn.cc65.org/cc65/trunk@4210 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-09-22 17:29:49 +00:00
: sta table,x
inx
Fixed bug triggered if all 8 io buffer slots may be used. git-svn-id: svn://svn.cc65.org/cc65/trunk@4242 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-09-26 21:32:05 +00:00
bne :-- ; Branch always
Added alternative implementation for ProDOS 8 I/O buffer management. The purpose of this implementation is to avoid pulling in the heap stuff (and especially the C-written posix_memalign() function) into small file utility-like applications. It saves in this scenario > 1400 Bytes. It manages memory blocks between $0800 and the cc65 start address. This is especially usefull for the now supported "native" SYS programs starting at $2000. git-svn-id: svn://svn.cc65.org/cc65/trunk@4210 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-09-22 17:29:49 +00:00
; ------------------------------------------------------------------------
.code
iobuf_alloc:
; Get and save "memptr"
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
jsr incsp2
jsr popax
sta ptr1
stx ptr1+1
Added alternative implementation for ProDOS 8 I/O buffer management. The purpose of this implementation is to avoid pulling in the heap stuff (and especially the C-written posix_memalign() function) into small file utility-like applications. It saves in this scenario > 1400 Bytes. It manages memory blocks between $0800 and the cc65 start address. This is especially usefull for the now supported "native" SYS programs starting at $2000. git-svn-id: svn://svn.cc65.org/cc65/trunk@4210 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-09-22 17:29:49 +00:00
; Search table for free entry
ldx #$00
: lda table,x
beq :+
inx
cpx #MAX_FDS
bcc :-
lda #ENOMEM
rts
; Mark table entry as used
: lda #$FF
sta table,x
; Convert table index to address hibyte
txa
asl
asl
clc
adc #>$0800
; Store address in "memptr"
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
ldy #$01
sta (ptr1),y
dey
tya
sta (ptr1),y
Added alternative implementation for ProDOS 8 I/O buffer management. The purpose of this implementation is to avoid pulling in the heap stuff (and especially the C-written posix_memalign() function) into small file utility-like applications. It saves in this scenario > 1400 Bytes. It manages memory blocks between $0800 and the cc65 start address. This is especially usefull for the now supported "native" SYS programs starting at $2000. git-svn-id: svn://svn.cc65.org/cc65/trunk@4210 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-09-22 17:29:49 +00:00
rts
iobuf_free:
; Convert address hibyte to table index
txa
sec
sbc #>$0800
lsr
lsr
; Mark table entry as free
tax
lda #$00
sta table,x
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
rts
Added alternative implementation for ProDOS 8 I/O buffer management. The purpose of this implementation is to avoid pulling in the heap stuff (and especially the C-written posix_memalign() function) into small file utility-like applications. It saves in this scenario > 1400 Bytes. It manages memory blocks between $0800 and the cc65 start address. This is especially usefull for the now supported "native" SYS programs starting at $2000. git-svn-id: svn://svn.cc65.org/cc65/trunk@4210 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-09-22 17:29:49 +00:00
; ------------------------------------------------------------------------
.bss
table: .res MAX_FDS
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