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Merge pull request #71 from groessler/something_to_pull2

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Support to create cartridges for the Atari.
This commit is contained in:
Oliver Schmidt 2014-01-17 12:14:18 -08:00
commit 8304852521
4 changed files with 98 additions and 0 deletions
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44
cfg/atari-cart.cfg Normal file
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FEATURES {
STARTADDRESS: default = $2000;
}
SYMBOLS {
__CARTSIZE__: type = weak, value = $2000; # possible values: $2000 and $4000
__CART_HEADER__: type = import;
__STACKSIZE__: type = weak, value = $0800; # 2k stack
__STARTADDRESS__: type = export, value = %S;
__RESERVED_MEMORY__: type = export, value = $0000;
__CARTFLAGS__: type = weak, value = $01; # see documentation for other possible values
}
MEMORY {
ZP: file = "", define = yes, start = $0082, size = $007E;
RAM: file = "", define = yes, start = %S, size = __CARTSIZE__;
ROM: file = %O, define = yes, start = $C000 - __CARTSIZE__, size = __CARTSIZE__ - 6, fill = yes, fillval = $FF;
CARTID: file = %O, start = $BFFA, size = $0006;
}
SEGMENTS {
STARTUP: load = ROM, type = ro, define = yes, optional = yes;
LOWCODE: load = ROM, type = ro, define = yes, optional = yes;
INIT: load = ROM, type = ro, optional = yes;
CODE: load = ROM, type = ro, define = yes;
RODATA: load = ROM, type = ro, optional = yes;
DATA: load = ROM, run = RAM, type = rw, define = yes, optional = yes;
BSS: load = RAM, type = bss, define = yes, optional = yes;
CARTHDR: load = CARTID, type = ro;
ZEROPAGE: load = ZP, type = zp;
EXTZP: load = ZP, type = zp, optional = yes;
}
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__;
}

22
libsrc/atari/carthdr.s Normal file
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; Cartridge "header"
; (In fact, it's at the end of the cartridge, so more a "trailer".)
;
; Christian Groessler, 06-Jan-2014
.ifndef __ATARIXL__
.import __CARTSIZE__, __CARTFLAGS__, cartinit, cartstart
.export __CART_HEADER__: absolute = 1
.include "atari.inc"
.segment "CARTHDR"
.word cartstart ; start routine
.byte 0 ; must be zero
.byte <__CARTFLAGS__
.word cartinit ; init routine
.assert (__CARTSIZE__ = $2000 || __CARTSIZE__ = $4000), error, "Cartridge size must either be $2000 or $4000"
.endif ; .ifndef __ATARIXL__

11
libsrc/atari/cartinit.s Normal file
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; Cartridge init routine
;
; Christian Groessler, 06-Jan-2014
.ifndef __ATARIXL__
.export cartinit
cartinit: rts
.endif ; .ifndef __ATARIXL__

21
libsrc/atari/cartstart.s Normal file
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; Cartridge start routine
;
; Christian Groessler, 06-Jan-2014
.ifndef __ATARIXL__
.export cartstart
.import start, copydata
.importzp ptr1, ptr2, tmp1, tmp2
.include "atari.inc"
; start routine of cartridge
; copy data segment to RAM and chain to entry point of crt0.s
cartstart: jsr copydata
jsr start ; run program
jmp (DOSVEC) ; return to DOS
.endif ; .ifndef __ATARIXL__