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Add target atari7800

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This commit is contained in:
Karri Kaksonen 2022-03-01 06:44:26 +02:00
parent f8cdb2ab63
commit 328781bf8a
8 changed files with 476 additions and 0 deletions
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8
asminc/atari7800.inc Normal file
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; Atari 7800 TIA & RIOT read / write registers
;
; Karri Kaksonen (karri@sipo.fi), 2022
; TIA, RIOT & MARIA registers mapping
.include "atari7800_tia.inc"
.include "atari7800_riot.inc"
.include "atari7800_maria.inc"

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asminc/atari7800_maria.inc Normal file
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; Atari 7800 MARIA read / write registers
;
; Read registers
BKGRND := $00
P0C1 := $01
P0C2 := $02
P0C3 := $03
MWSYNC := $04
P1C1 := $05
P1C2 := $06
P1C3 := $07
MSTAT := $08
P2C1 := $09
P2C2 := $0A
P2C3 := $0B
DPPH := $0C
P3C1 := $0D
P3C2 := $0E
P3C3 := $0F
DPPL := $10
P4C1 := $11
P4C2 := $12
P4C3 := $13
CHBASE := $14
P5C1 := $15
P5C2 := $16
P5C3 := $17
OFFSET := $18
P6C1 := $19
P6C2 := $1A
P6C3 := $1B
CTRL := $1C
P7C1 := $1D
P7C2 := $1E
P7C3 := $1F
; Write registers

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asminc/atari7800_riot.inc Normal file
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; Atari 7800 RIOT read / write registers
;
; Source: DASM - vcs.h
; Details available in: Stella Programmer's Guide by Steve Wright
;
; Florent Flament (contact@florentflament.com), 2017
; Read registers
SWCHA := $0280
CTLSWA := $0281
SWCHB := $0282
CTLSWB := $0283
INTIM := $0284
TIMINT := $0285
; Write registers
TIM1T := $0294
TIM8T := $0295
TIM64T := $0296
T1024T := $0297

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asminc/atari7800_tia.inc Normal file
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; Atari 7800 TIA read / write registers
;
; Source: DASM - vcs.h
; Details available in: Stella Programmer's Guide by Steve Wright
;
; Florent Flament (contact@florentflament.com), 2017
; Read registers
VSYNC := $00
VBLANK := $01
WSYNC := $02
RSYNC := $03
NUSIZ0 := $04
NUSIZ1 := $05
COLUP0 := $06
COLUP1 := $07
COLUPF := $08
COLUBK := $09
CTRLPF := $0A
REFP0 := $0B
REFP1 := $0C
PF0 := $0D
PF1 := $0E
PF2 := $0F
RESP0 := $10
RESP1 := $11
RESM0 := $12
RESM1 := $13
RESBL := $14
AUDC0 := $15
AUDC1 := $16
AUDF0 := $17
AUDF1 := $18
AUDV0 := $19
AUDV1 := $1A
GRP0 := $1B
GRP1 := $1C
ENAM0 := $1D
ENAM1 := $1E
ENABL := $1F
HMP0 := $20
HMP1 := $21
HMM0 := $22
HMM1 := $23
HMBL := $24
VDELP0 := $25
VDELP1 := $26
VDELBL := $27
RESMP0 := $28
RESMP1 := $29
HMOVE := $2A
HMCLR := $2B
CXCLR := $2C
; Write registers
CXM0P := $00
CXM1P := $01
CXP0FB := $02
CXP1FB := $03
CXM0FB := $04
CXM1FB := $05
CXBLPF := $06
CXPPMM := $07
INPT0 := $08
INPT1 := $09
INPT2 := $0A
INPT3 := $0B
INPT4 := $0C
INPT5 := $0D

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# Atari VCS 7800 linker configuration file for cc65
SYMBOLS {
__STACKSIZE__: type = weak, value = $0010; # 16 bytes stack
}
MEMORY {
ZP: file = "", define = yes, start = $0040, size = $00C0, type = rw;
SP: file = "", define = yes, start = $0140, size = $00C0, type = rw;
RAM1: file = "", define = yes, start = $1800, size = $0840, type = rw;
RAM2: file = "", define = yes, start = $2100, size = $0040, type = rw;
RAM3: file = "", define = yes, start = $2200, size = $0600, type = rw;
# "Normal" cartridge rom. Multiple banks arent supported
# by this script. You may change the rom size, but keep
# two things in mind:
# - start must be a multiple of $1000
# - ROM must end at $ff79
ROM: file = %O, define = yes, start = $8000, size = $7f7a, type = ro, fill = yes, fillval = $ff;
# Encryption stuff
ROME: file = %O, start = $ff7a, size = $80, type = ro, fill = yes, fillval = $ff;
# Interrupt vectors
ROMV: file = %O, start = $fffa, size = $6, type = ro, fill = yes, fillval = $ff;
}
SEGMENTS {
ZEROPAGE: load = ZP, type = zp;
STARTUP: load = ROM, type = ro, define = yes;
CODE: load = ROM, type = ro, define = yes;
RODATA: load = ROM, type = ro, define = yes, align = 256;
DATA: load = ROM, run = RAM1, type = rw, define = yes;
BSS: load = RAM1, type = bss, define = yes;
VECTORS: load = ROM, type = ro, define = yes;
ENCRYPTION: load = ROME, type = ro define = yes;
}
FEATURES {
CONDES: type = constructor,
label = __CONSTRUCTOR_TABLE__,
count = __CONSTRUCTOR_COUNT__,
segment = ONCE;
CONDES: type = destructor,
label = __DESTRUCTOR_TABLE__,
count = __DESTRUCTOR_COUNT__,
segment = RODATA;
CONDES: type = interruptor,
label = __INTERRUPTOR_TABLE__,
count = __INTERRUPTOR_COUNT__,
segment = RODATA,
import = __CALLIRQ__;
}

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<!doctype linuxdoc system>
<article>
<title>Atari 7800 specific information for cc65
<author>
<url url="mailto:contact@florentflament.com" name="Florent Flament"><newline>
<abstract>
An overview over the Atari 7800 runtime system as it is implemented
for the cc65 C compiler.
</abstract>
<!-- Table of contents -->
<toc>
<!-- Begin the document -->
<sect>Overview<p>
This file contains an overview of the Atari 7800 runtime system as it
comes with the cc65 C compiler. It describes the memory layout, Atari
7800 specific header files and any pitfalls specific to that platform.
<sect>Binary format<p>
The default binary output format generated by the linker for the Atari
7800 target is a 4K cartridge image.
<sect>Memory layout<p>
cc65 generated programs with the default setup can use RAM from
&dollar;0080 to &dollar;00FF - __STACKSIZE__, where __STACKSIZE__ is
the size of the system stack with a default value of 16 bytes. The
size of the system stack can be customized by defining the
__STACKSIZE__ linker variable.
Special locations:
<descrip>
<tag/Stack/ The C runtime stack is located at &dollar;00FF -
__STACKSIZE__ and growing downwards.
<tag/Heap/ The C heap is located at &dollar;0080 and grows upwards.
</descrip><p>
<sect>Start-up condition<p>
When powered-up, the Atari 7800 TIA registers contain random
values. During the initialization phase, the start-up code needs to
initialize the TIA registers to sound values (or else the console has
an unpredictable behavior). In this implementation, zeros are written
to all of TIA registers during the start-up phase.
Note that RIOT registers (mostly timers) are left uninitialized, as
they don't have any consequence on the console behavior.
<sect>Platform specific header files<p>
Programs containing Atari 7800 specific code may use the
<tt/atari7800.h/ header file.
The following pseudo variables declared in the <tt/atari7800.h/ header
file allow access to the Atari 7800 TIA & RIOT chips registers.
<descrip>
<tag><tt/TIA/</tag> The <tt/TIA/ structure allows read/write access
to the Atari 7800 TIA chip registers. See the <tt/_tia.h/ header
file located in the include directory for the declaration of the
structure. Also refer to the Stella Programmer's Guide by Steve
Wright for a detailed description of the chip and its registers.
<tag><tt/RIOT/</tag> The <tt/RIOT/ structure allows read/write
access to the Atari 7800 RIOT chip registers. See the
<tt/_riot.h/ header file located in the include directory for the
declaration of the structure. Also refer to the Stella Programmer's
Guide by Steve Wright for a detailed description of the chip and its
registers.
</descrip><p>
<sect>Loadable drivers<p>
There are no drivers for the Atari 7800.
<sect>Limitations<p>
TBD
<sect>Other hints<p>
One may write a custom linker configuration file to tune the memory
layout of a program. See the <tt/atari7800.cfg/ file in the cfg
directory as a starting point.
<sect>License<p>
This software is provided 'as-is', without any expressed or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
<enum>
<item> The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
<item> Altered source versions must be plainly marked as such, and must not
be misrepresented as being the original software.
<item> This notice may not be removed or altered from any source
distribution.
</enum>
</article>

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/*****************************************************************************/
/* */
/* _maria.h */
/* */
/* Atari 7800, Maria chip register hardware structures */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */
/* warranty. In no event will the authors be held liable for any damages */
/* arising from the use of this software. */
/* */
/* Permission is granted to anyone to use this software for any purpose, */
/* including commercial applications, and to alter it and redistribute it */
/* freely, subject to the following restrictions: */
/* */
/* 1. The origin of this software must not be misrepresented; you must not */
/* claim that you wrote the original software. If you use this software */
/* in a product, an acknowledgment in the product documentation would be */
/* appreciated but is not required. */
/* 2. Altered source versions must be plainly marked as such, and must not */
/* be misrepresented as being the original software. */
/* 3. This notice may not be removed or altered from any source */
/* distribution. */
/* */
/*****************************************************************************/
/*
* MARIA registers
*/
struct __maria {
unsigned char bkgrnd;
unsigned char p0c1;
unsigned char p0c2;
unsigned char p0c3;
unsigned char wsync;
unsigned char p1c1;
unsigned char p1c2;
unsigned char p1c3;
unsigned char mstat;
unsigned char p2c1;
unsigned char p2c2;
unsigned char p2c3;
unsigned char dpph;
unsigned char p3c1;
unsigned char p3c2;
unsigned char p3c3;
unsigned char dppl;
unsigned char p4c1;
unsigned char p4c2;
unsigned char p4c3;
unsigned char chbase;
unsigned char p5c1;
unsigned char p5c2;
unsigned char p5c3;
unsigned char offset;
unsigned char p6c1;
unsigned char p6c2;
unsigned char p6c3;
unsigned char ctrl;
unsigned char p7c1;
unsigned char p7c2;
unsigned char p7c3;
};

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/*****************************************************************************/
/* */
/* Atari VCS 7800 TIA & RIOT registers addresses */
/* */
/* Karri Kaksonen (karri@sipo.fi), 2022 */
/* */
/* */
/*****************************************************************************/
#ifndef _ATARI7800_H
#define _ATARI7800_H
/* Check for errors */
#if !defined(__ATARI7800__)
# error This module may only be used when compiling for the Atari 7800!
#endif
/*****************************************************************************/
/* Data */
/*****************************************************************************/
/* Color defines */
#define COLOR_BLACK 0x00
#define COLOR_WHITE 0x0F
/* TGI color defines (default palette) */
#define TGI_COLOR_BLACK COLOR_BLACK
#define TGI_COLOR_WHITE COLOR_WHITE
/* Masks for joy_read */
#define JOY_RIGHT_MASK 0x80
#define JOY_LEFT_MASK 0x40
#define JOY_DOWN_MASK 0x20
#define JOY_UP_MASK 0x10
#define JOY_BTN_1_MASK 0x01
#define JOY_BTN_2_MASK 0x02
#define JOY_BTN_A_MASK JOY_BTN_1_MASK
#define JOY_BTN_B_MASK JOY_BTN_2_MASK
#define JOY_BTN_A(v) ((v) & JOY_BTN_A_MASK)
#define JOY_BTN_B(v) ((v) & JOY_BTN_B_MASK)
/* No support for dynamically loadable drivers */
#define DYN_DRV 0
#include <_tia.h>
#define TIA (*(struct __tia*)0x0000)
#include <_riot.h>
#define RIOT (*(struct __riot*)0x0280)
#include <_maria.h>
#define MARIA (*(struct __maria*)0x0020)
/*
* Alternative MARIA register definitions.
*/
#define BKGRND MARIA.bkgrnd
#define BACKGRND MARIA.bkgrnd
#define P0C1 MARIA.p0c1
#define P0C2 MARIA.p0c2
#define P0C3 MARIA.p0c3
#define WSYNC MARIA.wsync
#define P1C1 MARIA.p1c1
#define P1C2 MARIA.p1c2
#define P1C3 MARIA.p1c3
#define MSTAT MARIA.mstat
#define P2C1 MARIA.p2c1
#define P2C2 MARIA.p2c2
#define P2C3 MARIA.p2c3
#define DPPH MARIA.dpph
#define DPH MARIA.dpph
#define P3C1 MARIA.p3c1
#define P3C2 MARIA.p3c2
#define P3C3 MARIA.p3c3
#define DPPL MARIA.dppl
#define DPL MARIA.dppl
#define P4C1 MARIA.p4c1
#define P4C2 MARIA.p4c2
#define P4C3 MARIA.p4c3
#define CHBASE MARIA.chbase
#define P5C1 MARIA.p5c1
#define P5C2 MARIA.p5c2
#define P5C3 MARIA.p5c3
#define OFFSET MARIA.offset
#define P6C1 MARIA.p6c1
#define P6C2 MARIA.p6c2
#define P6C3 MARIA.p6c3
#define CTRL MARIA.ctrl
#define P7C1 MARIA.p7c1
#define P7C2 MARIA.p7c2
#define P7C3 MARIA.p7c3
/*
* MSTAT register constants
*/
#define MSTAT_VBLANK 0x80 /* vblank is on when bit 7 is set */
/* End of atari7800.h */
#endif