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Add operating system symbols for the Atari 5200 target

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baktrasf 2020-12-21 21:31:53 +01:00 committed by Oliver Schmidt
parent dfd047ce6a
commit 1c72da4904
2 changed files with 84 additions and 0 deletions
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80
include/_atari5200os.h Normal file
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@ -0,0 +1,80 @@
/*****************************************************************************/
/* */
/* _atari5200os.h */
/* */
/* Internal include file, do not use directly */
/* */
/* */
/* 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. */
/* */
/*****************************************************************************/
#ifndef __ATARI5200OS_H
#define __ATARI5200OS_H
struct __os {
/*Page zero*/
unsigned char pokmsk; // = $00 System mask for POKEY IRQ enable
unsigned char rtclok[2]; // = $01,$02 Real time clock
unsigned char critic; // = $03 Critical section flag
unsigned char atract; // = $04 Attract mode counter
union {
struct {
unsigned char sdlstl; // = $05 Save display list LO
unsigned char sdlsth; // = $06 Save display list HI
};
void* sdlst; // = $05,$06 Display list shadow
};
unsigned char sdmctl; // = $07 DMACTL shadow
unsigned char pcolr0; // = $08 PM color 0
unsigned char pcolr1; // = $09 PM color 1
unsigned char pcolr2; // = $0A PM color 2
unsigned char pcolr3; // = $0B PM color 3
unsigned char color0; // = $0C PF Color 0
unsigned char color1; // = $0D PF Color 1
unsigned char color2; // = $0E PF Color 2
unsigned char color3; // = $0F PF Color 3
unsigned char color4; // = $10 PF Color 4
unsigned char __filler[0xEF]; // = $11-$FF Filler
/*Stack*/
unsigned char stack[0x100]; // = $100-$1FF Stack
/*Page 2 OS variables*/
void (*vinter)(void); // = $200 Immediate IRQ vector
void (*vvblki)(void); // = $202 Immediate VBI vector
void (*vvblkd)(void); // = $204 Deferred VBI vector
void (*vdslst)(void); // = $206 DLI vector
void (*vkeybd)(void); // = $208 Keyboard IRQ vector
void (*vkeypd)(void); // = $20A Keypad continue vector
void (*vbrkky)(void); // = $20C Break key interrupt vector
void (*vbreak)(void); // = $20E Break instruction interrupt vector
void (*vserin)(void); // = $210 Serial input ready vector
void (*vseror)(void); // = $212 Serial output data needed vector
void (*vseroc)(void); // = $214 Serial output completed vector
void (*vtimr1)(void); // = $216 POKEY timer 1 IRQ vector
void (*vtimr2)(void); // = $218 POKEY timer 2 IRQ vector
void (*vtimr4)(void); // = $21A POKEY timer 4 IRQ vector
};
#endif

4
include/atari5200.h
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@ -65,6 +65,10 @@ extern void atr5200std_joy[]; /* referred to by joy_static_stddrv[] */
#define AT_NTSC 0
#define AT_PAL 1
/* Define variables used by the OS*/
#include <_atari5200os.h>
#define OS (*(struct __os*)0x0000)
/* define hardware */
#include <_gtia.h>
#define GTIA_READ (*(struct __gtia_read*)0xC000)