mirror of https://github.com/cc65/cc65.git
Add target atari7800
This commit is contained in:
Karri Kaksonen
parent
f8cdb2ab63
commit
328781bf8a
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; Atari 7800 TIA & RIOT read / write registers
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;
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; Karri Kaksonen (karri@sipo.fi), 2022
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; TIA, RIOT & MARIA registers mapping
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.include "atari7800_tia.inc"
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.include "atari7800_riot.inc"
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.include "atari7800_maria.inc"
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@ -0,0 +1,39 @@
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; Atari 7800 MARIA read / write registers
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;
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; Read registers
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BKGRND := $00
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P0C1 := $01
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P0C2 := $02
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P0C3 := $03
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MWSYNC := $04
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P1C1 := $05
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P1C2 := $06
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P1C3 := $07
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MSTAT := $08
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P2C1 := $09
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P2C2 := $0A
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P2C3 := $0B
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DPPH := $0C
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P3C1 := $0D
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P3C2 := $0E
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P3C3 := $0F
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DPPL := $10
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P4C1 := $11
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P4C2 := $12
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P4C3 := $13
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CHBASE := $14
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P5C1 := $15
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P5C2 := $16
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P5C3 := $17
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OFFSET := $18
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P6C1 := $19
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P6C2 := $1A
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P6C3 := $1B
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CTRL := $1C
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P7C1 := $1D
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P7C2 := $1E
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P7C3 := $1F
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; Write registers
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@ -0,0 +1,20 @@
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; Atari 7800 RIOT read / write registers
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;
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; Source: DASM - vcs.h
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; Details available in: Stella Programmer's Guide by Steve Wright
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;
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; Florent Flament (contact@florentflament.com), 2017
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; Read registers
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SWCHA := $0280
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CTLSWA := $0281
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SWCHB := $0282
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CTLSWB := $0283
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INTIM := $0284
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TIMINT := $0285
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; Write registers
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TIM1T := $0294
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TIM8T := $0295
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TIM64T := $0296
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T1024T := $0297
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@ -0,0 +1,69 @@
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; Atari 7800 TIA read / write registers
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;
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; Source: DASM - vcs.h
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; Details available in: Stella Programmer's Guide by Steve Wright
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;
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; Florent Flament (contact@florentflament.com), 2017
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; Read registers
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VSYNC := $00
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VBLANK := $01
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WSYNC := $02
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RSYNC := $03
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NUSIZ0 := $04
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NUSIZ1 := $05
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COLUP0 := $06
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COLUP1 := $07
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COLUPF := $08
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COLUBK := $09
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CTRLPF := $0A
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REFP0 := $0B
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REFP1 := $0C
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PF0 := $0D
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PF1 := $0E
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PF2 := $0F
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RESP0 := $10
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RESP1 := $11
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RESM0 := $12
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RESM1 := $13
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RESBL := $14
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AUDC0 := $15
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AUDC1 := $16
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AUDF0 := $17
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AUDF1 := $18
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AUDV0 := $19
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AUDV1 := $1A
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GRP0 := $1B
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GRP1 := $1C
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ENAM0 := $1D
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ENAM1 := $1E
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ENABL := $1F
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HMP0 := $20
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HMP1 := $21
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HMM0 := $22
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HMM1 := $23
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HMBL := $24
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VDELP0 := $25
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VDELP1 := $26
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VDELBL := $27
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RESMP0 := $28
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RESMP1 := $29
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HMOVE := $2A
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HMCLR := $2B
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CXCLR := $2C
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; Write registers
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CXM0P := $00
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CXM1P := $01
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CXP0FB := $02
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CXP1FB := $03
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CXM0FB := $04
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CXM1FB := $05
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CXBLPF := $06
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CXPPMM := $07
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INPT0 := $08
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INPT1 := $09
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INPT2 := $0A
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INPT3 := $0B
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INPT4 := $0C
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INPT5 := $0D
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@ -0,0 +1,50 @@
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# Atari VCS 7800 linker configuration file for cc65
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SYMBOLS {
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__STACKSIZE__: type = weak, value = $0010; # 16 bytes stack
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}
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MEMORY {
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ZP: file = "", define = yes, start = $0040, size = $00C0, type = rw;
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SP: file = "", define = yes, start = $0140, size = $00C0, type = rw;
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RAM1: file = "", define = yes, start = $1800, size = $0840, type = rw;
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RAM2: file = "", define = yes, start = $2100, size = $0040, type = rw;
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RAM3: file = "", define = yes, start = $2200, size = $0600, type = rw;
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# "Normal" cartridge rom. Multiple banks arent supported
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# by this script. You may change the rom size, but keep
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# two things in mind:
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# - start must be a multiple of $1000
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# - ROM must end at $ff79
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ROM: file = %O, define = yes, start = $8000, size = $7f7a, type = ro, fill = yes, fillval = $ff;
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# Encryption stuff
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ROME: file = %O, start = $ff7a, size = $80, type = ro, fill = yes, fillval = $ff;
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# Interrupt vectors
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ROMV: file = %O, start = $fffa, size = $6, type = ro, fill = yes, fillval = $ff;
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}
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SEGMENTS {
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ZEROPAGE: load = ZP, type = zp;
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STARTUP: load = ROM, type = ro, define = yes;
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CODE: load = ROM, type = ro, define = yes;
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RODATA: load = ROM, type = ro, define = yes, align = 256;
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DATA: load = ROM, run = RAM1, type = rw, define = yes;
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BSS: load = RAM1, type = bss, define = yes;
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VECTORS: load = ROM, type = ro, define = yes;
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ENCRYPTION: load = ROME, type = ro define = yes;
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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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<!doctype linuxdoc system>
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<article>
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<title>Atari 7800 specific information for cc65
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<author>
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<url url="mailto:contact@florentflament.com" name="Florent Flament"><newline>
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<abstract>
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An overview over the Atari 7800 runtime system as it is implemented
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for the cc65 C compiler.
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</abstract>
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<!-- Table of contents -->
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<toc>
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<!-- Begin the document -->
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<sect>Overview<p>
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This file contains an overview of the Atari 7800 runtime system as it
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comes with the cc65 C compiler. It describes the memory layout, Atari
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7800 specific header files and any pitfalls specific to that platform.
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<sect>Binary format<p>
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The default binary output format generated by the linker for the Atari
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7800 target is a 4K cartridge image.
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<sect>Memory layout<p>
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cc65 generated programs with the default setup can use RAM from
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$0080 to $00FF - __STACKSIZE__, where __STACKSIZE__ is
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the size of the system stack with a default value of 16 bytes. The
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size of the system stack can be customized by defining the
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__STACKSIZE__ linker variable.
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Special locations:
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<descrip>
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<tag/Stack/ The C runtime stack is located at $00FF -
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__STACKSIZE__ and growing downwards.
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<tag/Heap/ The C heap is located at $0080 and grows upwards.
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</descrip><p>
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<sect>Start-up condition<p>
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When powered-up, the Atari 7800 TIA registers contain random
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values. During the initialization phase, the start-up code needs to
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initialize the TIA registers to sound values (or else the console has
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an unpredictable behavior). In this implementation, zeros are written
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to all of TIA registers during the start-up phase.
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Note that RIOT registers (mostly timers) are left uninitialized, as
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they don't have any consequence on the console behavior.
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<sect>Platform specific header files<p>
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Programs containing Atari 7800 specific code may use the
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<tt/atari7800.h/ header file.
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The following pseudo variables declared in the <tt/atari7800.h/ header
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file allow access to the Atari 7800 TIA & RIOT chips registers.
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<descrip>
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<tag><tt/TIA/</tag> The <tt/TIA/ structure allows read/write access
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to the Atari 7800 TIA chip registers. See the <tt/_tia.h/ header
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file located in the include directory for the declaration of the
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structure. Also refer to the Stella Programmer's Guide by Steve
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Wright for a detailed description of the chip and its registers.
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<tag><tt/RIOT/</tag> The <tt/RIOT/ structure allows read/write
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access to the Atari 7800 RIOT chip registers. See the
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<tt/_riot.h/ header file located in the include directory for the
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declaration of the structure. Also refer to the Stella Programmer's
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Guide by Steve Wright for a detailed description of the chip and its
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registers.
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</descrip><p>
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<sect>Loadable drivers<p>
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There are no drivers for the Atari 7800.
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<sect>Limitations<p>
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TBD
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<sect>Other hints<p>
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One may write a custom linker configuration file to tune the memory
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layout of a program. See the <tt/atari7800.cfg/ file in the cfg
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directory as a starting point.
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<sect>License<p>
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This software is provided 'as-is', without any expressed or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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<enum>
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<item> The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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<item> Altered source versions must be plainly marked as such, and must not
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be misrepresented as being the original software.
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<item> This notice may not be removed or altered from any source
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distribution.
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</enum>
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</article>
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@ -0,0 +1,63 @@
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/*****************************************************************************/
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/* */
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/* _maria.h */
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/* */
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/* Atari 7800, Maria chip register hardware structures */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated but is not required. */
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/* 2. Altered source versions must be plainly marked as such, and must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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/*
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* MARIA registers
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*/
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struct __maria {
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unsigned char bkgrnd;
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unsigned char p0c1;
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unsigned char p0c2;
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unsigned char p0c3;
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unsigned char wsync;
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unsigned char p1c1;
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unsigned char p1c2;
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unsigned char p1c3;
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unsigned char mstat;
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unsigned char p2c1;
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unsigned char p2c2;
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unsigned char p2c3;
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unsigned char dpph;
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unsigned char p3c1;
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unsigned char p3c2;
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unsigned char p3c3;
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unsigned char dppl;
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unsigned char p4c1;
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unsigned char p4c2;
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unsigned char p4c3;
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unsigned char chbase;
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unsigned char p5c1;
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unsigned char p5c2;
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unsigned char p5c3;
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unsigned char offset;
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unsigned char p6c1;
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unsigned char p6c2;
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unsigned char p6c3;
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unsigned char ctrl;
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unsigned char p7c1;
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unsigned char p7c2;
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unsigned char p7c3;
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};
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@ -0,0 +1,105 @@
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/*****************************************************************************/
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/* */
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/* Atari VCS 7800 TIA & RIOT registers addresses */
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/* */
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/* Karri Kaksonen (karri@sipo.fi), 2022 */
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/* */
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/* */
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/*****************************************************************************/
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#ifndef _ATARI7800_H
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#define _ATARI7800_H
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/* Check for errors */
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#if !defined(__ATARI7800__)
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# error This module may only be used when compiling for the Atari 7800!
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#endif
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/*****************************************************************************/
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/* Data */
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/*****************************************************************************/
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/* Color defines */
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#define COLOR_BLACK 0x00
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#define COLOR_WHITE 0x0F
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/* TGI color defines (default palette) */
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#define TGI_COLOR_BLACK COLOR_BLACK
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#define TGI_COLOR_WHITE COLOR_WHITE
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/* Masks for joy_read */
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#define JOY_RIGHT_MASK 0x80
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#define JOY_LEFT_MASK 0x40
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#define JOY_DOWN_MASK 0x20
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#define JOY_UP_MASK 0x10
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#define JOY_BTN_1_MASK 0x01
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#define JOY_BTN_2_MASK 0x02
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#define JOY_BTN_A_MASK JOY_BTN_1_MASK
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#define JOY_BTN_B_MASK JOY_BTN_2_MASK
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#define JOY_BTN_A(v) ((v) & JOY_BTN_A_MASK)
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#define JOY_BTN_B(v) ((v) & JOY_BTN_B_MASK)
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/* No support for dynamically loadable drivers */
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#define DYN_DRV 0
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#include <_tia.h>
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#define TIA (*(struct __tia*)0x0000)
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#include <_riot.h>
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#define RIOT (*(struct __riot*)0x0280)
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#include <_maria.h>
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#define MARIA (*(struct __maria*)0x0020)
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/*
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* Alternative MARIA register definitions.
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*/
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#define BKGRND MARIA.bkgrnd
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#define BACKGRND MARIA.bkgrnd
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#define P0C1 MARIA.p0c1
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#define P0C2 MARIA.p0c2
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#define P0C3 MARIA.p0c3
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#define WSYNC MARIA.wsync
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#define P1C1 MARIA.p1c1
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#define P1C2 MARIA.p1c2
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#define P1C3 MARIA.p1c3
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#define MSTAT MARIA.mstat
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#define P2C1 MARIA.p2c1
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#define P2C2 MARIA.p2c2
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#define P2C3 MARIA.p2c3
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#define DPPH MARIA.dpph
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#define DPH MARIA.dpph
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#define P3C1 MARIA.p3c1
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#define P3C2 MARIA.p3c2
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#define P3C3 MARIA.p3c3
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#define DPPL MARIA.dppl
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#define DPL MARIA.dppl
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#define P4C1 MARIA.p4c1
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#define P4C2 MARIA.p4c2
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#define P4C3 MARIA.p4c3
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#define CHBASE MARIA.chbase
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#define P5C1 MARIA.p5c1
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#define P5C2 MARIA.p5c2
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#define P5C3 MARIA.p5c3
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#define OFFSET MARIA.offset
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#define P6C1 MARIA.p6c1
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#define P6C2 MARIA.p6c2
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#define P6C3 MARIA.p6c3
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#define CTRL MARIA.ctrl
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#define P7C1 MARIA.p7c1
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#define P7C2 MARIA.p7c2
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#define P7C3 MARIA.p7c3
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/*
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* MSTAT register constants
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*/
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#define MSTAT_VBLANK 0x80 /* vblank is on when bit 7 is set */
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/* End of atari7800.h */
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#endif
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