6502/cc65
1
0
Fork 0
mirror of https://github.com/cc65/cc65.git synced 2024-12-27 15:29:46 +00:00
Code Issues Projects Releases Wiki Activity
38049d22ba
cc65/libsrc/apple2/extra/iobuf-0800.s

96 lines
1.9 KiB
ArmAsm
Raw Normal View History

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
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"
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
; ------------------------------------------------------------------------
Adjusted constructors. The constructors are _NOT_ allowed anymore to access the BSS. Rather they must use the DATA segment or the INIT segment. The latter isn't cleared at any point so the constructors may use it to expose values to the main program. However they must make sure to always write the values as they are not pre-initialized.
2016-03-16 15:28:32 +00:00
.data
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
table: .res MAX_FDS
Reference in New Issue Copy Permalink