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Atari: initial support to create cassette bootable programs -- unfinished

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This commit is contained in:
Christian Groessler 2014-01-02 19:28:22 +01:00
parent e267addb5b
commit 057884ffa9
2 changed files with 93 additions and 0 deletions
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53
cfg/atari-cassette.cfg Normal file
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FEATURES {
STARTADDRESS: default = $1000;
}
SYMBOLS {
_cas_init: type = import;
__STACKSIZE__: type = weak, value = $0800; # 2k stack
__STARTADDRESS__: type = export, value = %S;
__RESERVED_MEMORY__: type = weak, value = $0000;
}
MEMORY {
ZP: file = "", define = yes, start = $0082, size = $007E;
# file header, just $FFFF
# HEADER: file = "", start = $0000, size = $0002;
# CASHDR: file = %O, start = $3FD, size = 128, fill = yes;
CASHDR: file = %O, start = $0, size = 6;
# "main program" load chunk
# MAINHDR: file = "", start = $0000, size = $0004;
RAM: file = %O, define = yes, start = %S, size = $BC20 - __STACKSIZE__ - __RESERVED_MEMORY__ - %S;
# TRAILER: file = "", start = $0000, size = $0006;
}
SEGMENTS {
# EXEHDR: load = HEADER, type = ro;
# MAINHDR: load = MAINHDR, type = ro;
CASHDR: load = CASHDR, type = ro;
CASINIT: load = RAM, type = ro;
STARTUP: load = RAM, type = ro, define = yes;
LOWCODE: load = RAM, type = ro, define = yes, optional = yes;
INIT: load = RAM, type = ro, optional = yes;
CODE: load = RAM, type = ro, define = yes;
RODATA: load = RAM, type = ro;
DATA: load = RAM, type = rw;
BSS: load = RAM, type = bss, define = yes;
ZEROPAGE: load = ZP, type = zp;
EXTZP: load = ZP, type = zp, optional = yes;
# AUTOSTRT: load = TRAILER, type = ro;
}
FEATURES {
CONDES: type = constructor,
label = __CONSTRUCTOR_TABLE__,
count = __CONSTRUCTOR_COUNT__,
segment = INIT;
CONDES: type = destructor,
label = __DESTRUCTOR_TABLE__,
count = __DESTRUCTOR_COUNT__,
segment = RODATA;
CONDES: type = interruptor,
label = __INTERRUPTOR_TABLE__,
count = __INTERRUPTOR_COUNT__,
segment = RODATA,
import = __CALLIRQ__;
}

40
libsrc/atari/cashdr.s Normal file
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;
; Cassette boot file header
;
; Christian Groessler, chris@groessler.org, 2013
;
.ifndef __ATARIXL__
.include "atari.inc"
.import __BSS_RUN__, __STARTADDRESS__, start
.export _cas_init
.segment "CASHDR"
.byte 0 ; ignored
.byte <((__BSS_RUN__ - __STARTADDRESS__ + 127 + 6) / 128)
.word __STARTADDRESS__
.word _cas_init
.segment "CASINIT"
lda #33
ldy #80
sta (SAVMSC),y
clc
rts
_cas_init:
lda #34
ldy #81
sta (SAVMSC),y
lda #<start
sta DOSVEC
lda #>start
sta DOSVEC+1
rts
.endif ; .ifdef __ATARIXL__