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https://github.com/cc65/cc65.git
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1cc4fa9356
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.
48 lines
2.4 KiB
INI
48 lines
2.4 KiB
INI
FEATURES {
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STARTADDRESS: default = $2000;
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}
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SYMBOLS {
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__CARTSIZE__: type = weak, value = $2000; # possible values: $2000 and $4000
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__CART_HEADER__: type = import;
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__STACKSIZE__: type = weak, value = $0800; # 2k stack
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__STARTADDRESS__: type = export, value = %S;
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__RESERVED_MEMORY__: type = export, value = $0000;
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__CARTFLAGS__: type = weak, value = $01; # see documentation for other possible values
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}
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MEMORY {
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ZP: file = "", define = yes, start = $0082, size = $007E;
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MAIN: file = "", define = yes, start = %S, size = __CARTSIZE__;
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ROM: file = %O, define = yes, start = $C000 - __CARTSIZE__, size = __CARTSIZE__ - 6, fill = yes, fillval = $FF;
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CARTID: file = %O, start = $BFFA, size = $0006;
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DISCARD: file = "", start = $0100, size = $FF00;
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}
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SEGMENTS {
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ZEROPAGE: load = ZP, type = zp, optional = yes;
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EXTZP: load = ZP, type = zp, optional = yes;
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STARTUP: load = ROM, type = ro, define = yes, optional = yes;
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LOWBSS: load = DISCARD, run = MAIN, type = rw, optional = yes; # not zero-initialized
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LOWCODE: load = ROM, type = ro, define = yes, optional = yes;
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ONCE: load = ROM, type = ro, optional = yes;
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CODE: load = ROM, type = ro, define = yes;
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RODATA: load = ROM, type = ro, optional = yes;
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DATA: load = ROM, run = MAIN, type = rw, define = yes, optional = yes;
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INIT: load = MAIN, type = bss, optional = yes;
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BSS: load = MAIN, type = bss, define = yes, optional = yes;
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CARTHDR: load = CARTID, type = ro;
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}
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FEATURES {
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CONDES: type = constructor,
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label = __CONSTRUCTOR_TABLE__,
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count = __CONSTRUCTOR_COUNT__,
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segment = ONCE;
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CONDES: type = destructor,
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label = __DESTRUCTOR_TABLE__,
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count = __DESTRUCTOR_COUNT__,
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segment = RODATA;
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CONDES: type = interruptor,
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label = __INTERRUPTOR_TABLE__,
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count = __INTERRUPTOR_COUNT__,
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segment = RODATA,
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import = __CALLIRQ__;
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}
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