Autor
es un codigo de c/c++
es de un emulador de sega llamado gens que emula el procesador 68k
este es star_68k.h
Código:
/*
** Starscream 680x0 emulation library
** Copyright 1997, 1998, 1999 Neill Corlett
**
** Refer to STARDOC.TXT for terms of use, API reference, and directions on
** how to compile.
*/
#ifndef __STARCPU_H__
#define __STARCPU_H__
#ifdef __cplusplus
extern "C" {
#endif
/* Remember to byte-swap these regions. (read STARDOC.TXT for details) */
struct STARSCREAM_PROGRAMREGION {
unsigned lowaddr;
unsigned highaddr;
unsigned offset;
};
struct STARSCREAM_DATAREGION {
unsigned lowaddr;
unsigned highaddr;
void *memorycall;
void *userdata;
};
/* Memory structures for 16-bit data path */
#define STARSCREAM_CONTEXTINFO_MEM16 \
struct STARSCREAM_PROGRAMREGION *fetch; \
struct STARSCREAM_DATAREGION *readbyte; \
struct STARSCREAM_DATAREGION *readword; \
struct STARSCREAM_DATAREGION *writebyte; \
struct STARSCREAM_DATAREGION *writeword; \
struct STARSCREAM_PROGRAMREGION *s_fetch; \
struct STARSCREAM_DATAREGION *s_readbyte; \
struct STARSCREAM_DATAREGION *s_readword; \
struct STARSCREAM_DATAREGION *s_writebyte; \
struct STARSCREAM_DATAREGION *s_writeword; \
struct STARSCREAM_PROGRAMREGION *u_fetch; \
struct STARSCREAM_DATAREGION *u_readbyte; \
struct STARSCREAM_DATAREGION *u_readword; \
struct STARSCREAM_DATAREGION *u_writebyte; \
struct STARSCREAM_DATAREGION *u_writeword; \
/* Memory structures for 16-bit data path with function code support */
#define STARSCREAM_CONTEXTINFO_MEM16FC \
unsigned (*f_readbyte) (unsigned f, unsigned a); \
unsigned (*f_readword) (unsigned f, unsigned a); \
unsigned (*f_writebyte)(unsigned f, unsigned a); \
unsigned (*f_writeword)(unsigned f, unsigned a); \
/* Memory structures for 32-bit sizable data path */
#define STARSCREAM_CONTEXTINFO_MEM32 \
struct STARSCREAM_PROGRAMREGION *fetch; \
struct STARSCREAM_DATAREGION *readbus; \
struct STARSCREAM_DATAREGION *writebus; \
struct STARSCREAM_PROGRAMREGION *s_fetch; \
struct STARSCREAM_DATAREGION *s_readbus; \
struct STARSCREAM_DATAREGION *s_writebus; \
struct STARSCREAM_PROGRAMREGION *u_fetch; \
struct STARSCREAM_DATAREGION *u_readbus; \
struct STARSCREAM_DATAREGION *u_writebus; \
unsigned (*f_readbus) (unsigned f, unsigned a); \
unsigned (*f_writebus)(unsigned f, unsigned a); \
/* Common context info for all 680x0 types */
#define STARSCREAM_CONTEXTINFO_COMMON \
void (*resethandler)(void); \
unsigned dreg[8]; \
unsigned areg[8]; \
unsigned asp; \
unsigned pc; \
unsigned odometer; \
unsigned char interrupts[8]; \
unsigned short sr; \
/* 68000-specific context info */
#define STARSCREAM_CONTEXTINFO_68000SPECIFIC \
unsigned short contextfiller00; \
struct S68000CONTEXT {
STARSCREAM_CONTEXTINFO_MEM16
STARSCREAM_CONTEXTINFO_COMMON
STARSCREAM_CONTEXTINFO_68000SPECIFIC
};
#define STARSCREAM_IDENTIFIERS(SNC,SN) \
\
extern struct SNC##CONTEXT SN##context; \
\
int SN##init (void); \
unsigned SN##reset (void); \
unsigned SN##exec (int n); \
int SN##interrupt (int level, int vector); \
void SN##flushInterrupts (void); \
int SN##GetContextSize (void); \
void SN##GetContext (void *context); \
void SN##SetContext (void *context); \
int SN##fetch (unsigned address); \
unsigned SN##readOdometer (void); \
unsigned SN##tripOdometer (void); \
unsigned SN##controlOdometer (int n); \
void SN##releaseTimeslice (void); \
void SN##releaseCycles (void); \
void SN##addCycles (int cycles); \
unsigned SN##readPC (void); \
STARSCREAM_IDENTIFIERS(S68000, main68k_)
STARSCREAM_IDENTIFIERS(S68000, sub68k_)
#ifdef __cplusplus
}
#endif
#endif
este es cpu_68k.h
Código:
#include "star_68k.h"
#ifndef _CPU_68K_H
#define _CPU_68K_H
extern struct S68000CONTEXT Context_68K;
int M68K_Init();
int S68K_Init();
void M68K_Reset(int System_ID);
void S68K_Reset();
void M68K_Reset_CPU();
void S68K_Reset_CPU();
void M68K_32X_Mode();
void M68K_Set_32X_Rom_Bank();
void M68K_Set_Prg_Ram();
void MS68K_Set_Word_Ram();
#endif
este es cpu_g8k.c
Código:
#include <stdio.h>
#include <string.h>
#include "port.h"
#include "cpu_68k.h"
#include "mem_m68k.h"
#include "mem_s68k.h"
#include "mem_sh2.h"
#include "save.h"
#include "ym2612.h"
#include "misc.h"
#include "gfx_cd.h"
#include "io.h"
#include "cd_sys.h"
#define GENESIS 0
#define _32X 1
#define SEGACD 2
/*** global variables ***/
struct S68000CONTEXT Context_68K;
struct STARSCREAM_PROGRAMREGION M68K_Fetch[] = {
{0x000000, 0x3FFFFF, (unsigned) 0x000000},
{0xFF0000, 0xFFFFFF, (unsigned) &Ram_68k[0] - 0xFF0000},
{0xF00000, 0xF0FFFF, (unsigned) &Ram_68k[0] - 0xF00000},
{0xEF0000, 0xEFFFFF, (unsigned) &Ram_68k[0] - 0xEF0000},
{-1, -1, (unsigned) NULL},
{-1, -1, (unsigned) NULL},
{-1, -1, (unsigned) NULL}
};
struct STARSCREAM_DATAREGION M68K_Read_Byte[5] = {
{0x000000, 0x3FFFFF, NULL, NULL},
{0xFF0000, 0xFFFFFF, NULL, &Ram_68k[0]},
{0x400000, 0xFEFFFF, (void *) M68K_RB, NULL},
{-1, -1, NULL, NULL}
};
struct STARSCREAM_DATAREGION M68K_Read_Word[5] = {
{0x000000, 0x3FFFFF, NULL, NULL},
{0xFF0000, 0xFFFFFF, NULL, &Ram_68k[0]},
{0x400000, 0xFEFFFF, (void *) M68K_RW, NULL},
{-1, -1, NULL, NULL}
};
struct STARSCREAM_DATAREGION M68K_Write_Byte[] = {
{0xFF0000, 0xFFFFFF, NULL, &Ram_68k[0]},
{0x000000, 0xFEFFFF, (void *) M68K_WB, NULL},
{-1, -1, NULL, NULL}
};
struct STARSCREAM_DATAREGION M68K_Write_Word[] = {
{0xFF0000, 0xFFFFFF, NULL, &Ram_68k[0]},
{0x000000, 0xFEFFFF, (void *) M68K_WW, NULL},
{-1, -1, NULL, NULL}
};
struct STARSCREAM_PROGRAMREGION S68K_Fetch[] = {
{0x000000, 0x07FFFF, (unsigned) &Ram_Prg[0]},
{-1, -1, (unsigned) NULL},
{-1, -1, (unsigned) NULL}
};
struct STARSCREAM_DATAREGION S68K_Read_Byte[] = {
{0x000000, 0x07FFFF, NULL, &Ram_Prg[0]},
{0x080000, 0xFFFFFF, (void *) S68K_RB, NULL},
{-1, -1, NULL, NULL}
};
struct STARSCREAM_DATAREGION S68K_Read_Word[] = {
{0x000000, 0x07FFFF, NULL, &Ram_Prg[0]},
{0x080000, 0xFFFFFF, (void *) S68K_RW, NULL},
{-1, -1, NULL, NULL}
};
struct STARSCREAM_DATAREGION S68K_Write_Byte[] = {
{0x000000, 0x07FFFF, NULL, &Ram_Prg[0]},
{0x080000, 0xFFFFFF, (void *) S68K_WB, NULL},
{-1, -1, NULL, NULL}
};
struct STARSCREAM_DATAREGION S68K_Write_Word[] = {
{0x000000, 0x07FFFF, NULL, &Ram_Prg[0]},
{0x080000, 0xFFFFFF, (void *) S68K_WW, NULL},
{-1, -1, NULL, NULL}
};
void
M68K_Reset_Handler ()
{
// Init_Memory_M68K(GENESIS);
}
void
S68K_Reset_Handler ()
{
// Init_Memory_M68K(SEGACD);
}
/*** M68K_Init - initialise the main 68K ***/
int
M68K_Init (void)
{
memset (&Context_68K, 0, sizeof (Context_68K));
Context_68K.s_fetch = Context_68K.u_fetch = Context_68K.fetch = M68K_Fetch;
Context_68K.s_readbyte = Context_68K.u_readbyte = Context_68K.readbyte =
M68K_Read_Byte;
Context_68K.s_readword = Context_68K.u_readword = Context_68K.readword =
M68K_Read_Word;
Context_68K.s_writebyte = Context_68K.u_writebyte = Context_68K.writebyte =
M68K_Write_Byte;
Context_68K.s_writeword = Context_68K.u_writeword = Context_68K.writeword =
M68K_Write_Word;
Context_68K.resethandler = (void *) M68K_Reset_Handler;
main68k_SetContext (&Context_68K);
main68k_init ();
return 1;
}
/*** S68K_Init - initialise the sub 68K ***/
int
S68K_Init (void)
{
memset (&Context_68K, 0, sizeof (Context_68K));
Context_68K.s_fetch = Context_68K.u_fetch = Context_68K.fetch = S68K_Fetch;
Context_68K.s_readbyte = Context_68K.u_readbyte = Context_68K.readbyte =
S68K_Read_Byte;
Context_68K.s_readword = Context_68K.u_readword = Context_68K.readword =
S68K_Read_Word;
Context_68K.s_writebyte = Context_68K.u_writebyte = Context_68K.writebyte =
S68K_Write_Byte;
Context_68K.s_writeword = Context_68K.u_writeword = Context_68K.writeword =
S68K_Write_Word;
Context_68K.resethandler = (void *) S68K_Reset_Handler;
sub68k_SetContext (&Context_68K);
sub68k_init ();
return 1;
}
/*** M68K_Reset - general reset of the main 68K CPU ***/
void
M68K_Reset (int System_ID)
{
memset (Ram_68k, 0, 64 * 1024);
M68K_Fetch[0].lowaddr = 0x000000;
M68K_Fetch[0].highaddr = Rom_Size - 1;
M68K_Fetch[0].offset = (unsigned) &Rom_Data[0] - 0x000000;
M68K_Fetch[1].lowaddr = 0xFF0000;
M68K_Fetch[1].highaddr = 0xFFFFFF;
M68K_Fetch[1].offset = (unsigned) &Ram_68k[0] - 0xFF0000;
if (System_ID == GENESIS)
{
M68K_Fetch[2].lowaddr = 0xF00000;
M68K_Fetch[2].highaddr = 0xF0FFFF;
M68K_Fetch[2].offset = (unsigned) &Ram_68k[0] - 0xF00000;
M68K_Fetch[3].lowaddr = 0xEF0000;
M68K_Fetch[3].highaddr = 0xEFFFFF;
M68K_Fetch[3].offset = (unsigned) &Ram_68k[0] - 0xEF0000;
M68K_Fetch[4].lowaddr = -1;
M68K_Fetch[4].highaddr = -1;
M68K_Fetch[4].offset = (unsigned) NULL;
}
else if (System_ID == _32X)
{
Bank_SH2 = 0;
M68K_Fetch[2].lowaddr = 0xF00000;
M68K_Fetch[2].highaddr = 0xF0FFFF;
M68K_Fetch[2].offset = (unsigned) &Ram_68k[0] - 0xF00000;
M68K_Fetch[3].lowaddr = 0xEF0000;
M68K_Fetch[3].highaddr = 0xEFFFFF;
M68K_Fetch[3].offset = (unsigned) &Ram_68k[0] - 0xEF0000;
M68K_Fetch[4].lowaddr = -1;
M68K_Fetch[4].highaddr = -1;
M68K_Fetch[4].offset = (unsigned) NULL;
}
else if (System_ID == SEGACD)
{
Bank_M68K = 0;
MS68K_Set_Word_Ram ();
M68K_Fetch[3].lowaddr = 0x020000;
M68K_Fetch[3].highaddr = 0x03FFFF;
M68K_Set_Prg_Ram ();
M68K_Fetch[4].lowaddr = 0xF00000;
M68K_Fetch[4].highaddr = 0xF0FFFF;
M68K_Fetch[4].offset = (unsigned) &Ram_68k[0] - 0xF00000;
M68K_Fetch[5].lowaddr = 0xEF0000;
M68K_Fetch[5].highaddr = 0xEFFFFF;
M68K_Fetch[5].offset = (unsigned) &Ram_68k[0] - 0xEF0000;
M68K_Fetch[6].lowaddr = -1;
M68K_Fetch[6].highaddr = -1;
M68K_Fetch[6].offset = (unsigned) NULL;
}
main68k_reset ();
Init_Memory_M68K (System_ID);
}
/*** S68K_Reset - general reset of the sub 68K CPU ***/
void
S68K_Reset (void)
{
memset (Ram_Prg, 0, 512 * 1024);
memset (Ram_Word_2M, 0, 256 * 1024);
memset (Ram_Word_1M, 0, 256 * 1024);
memset (COMM.Command, 0, 8 * 5);
memset (COMM.Status, 0, 8 * 5);
LED_Status = S68K_State = S68K_Mem_WP = S68K_Mem_PM = Ram_Word_State = 0;
COMM.Flag = Init_Timer_INT3 = Timer_INT3 = Int_Mask_S68K = 0;
Font_COLOR = Font_BITS = 0;
MS68K_Set_Word_Ram ();
sub68k_reset ();
}
/*** M68K_32X_Mode - modify 32x mode ***
*** - Called only during 32X emulation - ***/
void
M68K_32X_Mode ()
{
// if (_32X_ADEN && !_32X_RV) // 32X ON
if (_32X_ADEN) // 32X ON
{
if (!_32X_RV) // ROM MOVED
{
M68K_Fetch[0].lowaddr = 0x880000;
M68K_Fetch[0].highaddr = 0x8FFFFF;
M68K_Fetch[0].offset = (unsigned) &Rom_Data[0] - 0x880000;
M68K_Fetch[1].lowaddr = 0x900000;
M68K_Fetch[1].highaddr = 0x9FFFFF;
M68K_Set_32X_Rom_Bank ();
M68K_Fetch[2].lowaddr = 0xFF0000;
M68K_Fetch[2].highaddr = 0xFFFFFF;
M68K_Fetch[2].offset = (unsigned) &Ram_68k[0] - 0xFF0000;
M68K_Fetch[3].lowaddr = 0x00;
M68K_Fetch[3].highaddr = 0xFF;
M68K_Fetch[3].offset = (unsigned) &_32X_Genesis_Rom[0] - 0x000000;
M68K_Fetch[4].lowaddr = 0xEF0000;
M68K_Fetch[4].highaddr = 0xEFFFFF;
M68K_Fetch[4].offset = (unsigned) &Ram_68k[0] - 0xEF0000;
M68K_Fetch[5].lowaddr = 0xF00000;
M68K_Fetch[5].highaddr = 0xF0FFFF;
M68K_Fetch[5].offset = (unsigned) &Ram_68k[0] - 0xF00000;
M68K_Fetch[6].lowaddr = -1;
M68K_Fetch[6].highaddr = -1;
M68K_Fetch[6].offset = (unsigned) NULL;
M68K_Read_Byte_Table[0] = _32X_M68K_Read_Byte_Table[4 * 2];
M68K_Read_Word_Table[0] = _32X_M68K_Read_Word_Table[4 * 2];
}
else // ROM NOT MOVED BUT BIOS PRESENT
{
M68K_Fetch[0].lowaddr = 0x000100;
M68K_Fetch[0].highaddr = Rom_Size - 1;
M68K_Fetch[0].offset = (unsigned) &Rom_Data[0] - 0x000000;
M68K_Fetch[1].lowaddr = 0xFF0000;
M68K_Fetch[1].highaddr = 0xFFFFFF;
M68K_Fetch[1].offset = (unsigned) &Ram_68k[0] - 0xFF0000;
M68K_Fetch[2].lowaddr = 0x00;
M68K_Fetch[2].highaddr = 0xFF;
M68K_Fetch[2].offset = (unsigned) &_32X_Genesis_Rom[0] - 0x000000;
M68K_Fetch[3].lowaddr = 0xF00000;
M68K_Fetch[3].highaddr = 0xF0FFFF;
M68K_Fetch[3].offset = (unsigned) &Ram_68k[0] - 0xF00000;
M68K_Fetch[4].lowaddr = 0xEF0000;
M68K_Fetch[4].highaddr = 0xEFFFFF;
M68K_Fetch[4].offset = (unsigned) &Ram_68k[0] - 0xEF0000;
M68K_Fetch[5].lowaddr = -1;
M68K_Fetch[5].highaddr = -1;
M68K_Fetch[5].offset = (unsigned) NULL;
M68K_Read_Byte_Table[0] = _32X_M68K_Read_Byte_Table[4 * 2 + 1];
M68K_Read_Word_Table[0] = _32X_M68K_Read_Word_Table[4 * 2 + 1];
}
}
else
{
M68K_Fetch[0].lowaddr = 0x000000;
M68K_Fetch[0].highaddr = Rom_Size - 1;
M68K_Fetch[0].offset = (unsigned) &Rom_Data[0] - 0x000000;
M68K_Fetch[1].lowaddr = 0xFF0000;
M68K_Fetch[1].highaddr = 0xFFFFFF;
M68K_Fetch[1].offset = (unsigned) &Ram_68k[0] - 0xFF0000;
M68K_Fetch[2].lowaddr = 0xF00000;
M68K_Fetch[2].highaddr = 0xF0FFFF;
M68K_Fetch[2].offset = (unsigned) &Ram_68k[0] - 0xF00000;
M68K_Fetch[3].lowaddr = 0xEF0000;
M68K_Fetch[3].highaddr = 0xEFFFFF;
M68K_Fetch[3].offset = (unsigned) &Ram_68k[0] - 0xEF0000;
M68K_Fetch[4].lowaddr = -1;
M68K_Fetch[4].highaddr = -1;
M68K_Fetch[4].offset = (unsigned) NULL;
M68K_Read_Byte_Table[0] = _32X_M68K_Read_Byte_Table[0];
M68K_Read_Word_Table[0] = _32X_M68K_Read_Word_Table[0];
}
}
/*** M68K_Set_32X_Rom_Bank - modify 32x rom bank ***
*** - Called only during 32X emulation - ***/
void
M68K_Set_32X_Rom_Bank ()
{
if (_32X_ADEN && !_32X_RV)
{
M68K_Fetch[1].offset = (unsigned) &Rom_Data[Bank_SH2 << 20] - 0x900000;
M68K_Read_Byte_Table[(9 * 2) + 0] =
_32X_M68K_Read_Byte_Table[(Bank_SH2 << 1) + 0];
M68K_Read_Byte_Table[(9 * 2) + 1] =
_32X_M68K_Read_Byte_Table[(Bank_SH2 << 1) + 1];
M68K_Read_Word_Table[(9 * 2) + 0] =
_32X_M68K_Read_Word_Table[(Bank_SH2 << 1) + 0];
M68K_Read_Word_Table[(9 * 2) + 1] =
_32X_M68K_Read_Word_Table[(Bank_SH2 << 1) + 1];
}
else
{
}
}
/*** M68K_Set_Prg_Ram - modify bank Prg_Ram fetch ***
*** - Called only during SEGA CD emulation - ***/
void
M68K_Set_Prg_Ram ()
{
M68K_Fetch[3].offset = (unsigned) &Ram_Prg[Bank_M68K] - 0x020000;
}
/*** MS68K_Set_Word_Ram - modify bank Word_Ram fetch ***
*** - Called only during SEGA CD emulation - ***/
void
MS68K_Set_Word_Ram (void)
{
switch (Ram_Word_State)
{
case 0: // Mode 2M -> Assigned to Main CPU
M68K_Fetch[2].lowaddr = 0x200000;
M68K_Fetch[2].highaddr = 0x23FFFF;
M68K_Fetch[2].offset = (unsigned) &Ram_Word_2M[0] - 0x200000;
// S68K_Fetch[1].lowaddr = -1;
// S68K_Fetch[1].highaddr = -1;
// S68K_Fetch[1].offset = (unsigned) NULL;
S68K_Fetch[1].lowaddr = 0x080000; // why not after all...
S68K_Fetch[1].highaddr = 0x0BFFFF;
S68K_Fetch[1].offset = (unsigned) &Ram_Word_2M[0] - 0x080000;
break;
case 1: // Mode 2M -> Assigned to Sub CPU
// M68K_Fetch[2].lowaddr = -1;
// M68K_Fetch[2].highaddr = -1;
// M68K_Fetch[2].offset = (unsigned) NULL;
M68K_Fetch[2].lowaddr = 0x200000; // why not after all...
M68K_Fetch[2].highaddr = 0x23FFFF;
M68K_Fetch[2].offset = (unsigned) &Ram_Word_2M[0] - 0x200000;
S68K_Fetch[1].lowaddr = 0x080000;
S68K_Fetch[1].highaddr = 0x0BFFFF;
S68K_Fetch[1].offset = (unsigned) &Ram_Word_2M[0] - 0x080000;
break;
case 2: // Mode 1M -> Bank 0 to Main CPU
M68K_Fetch[2].lowaddr = 0x200000; // Bank 0
M68K_Fetch[2].highaddr = 0x21FFFF;
M68K_Fetch[2].offset = (unsigned) &Ram_Word_1M[0] - 0x200000;
S68K_Fetch[1].lowaddr = 0x0C0000; // Bank 1
S68K_Fetch[1].highaddr = 0x0DFFFF;
S68K_Fetch[1].offset = (unsigned) &Ram_Word_1M[0x20000] - 0x0C0000;
break;
case 3: // Mode 1M -> Bank 0 to Sub CPU
M68K_Fetch[2].lowaddr = 0x200000; // Bank 1
M68K_Fetch[2].highaddr = 0x21FFFF;
M68K_Fetch[2].offset = (unsigned) &Ram_Word_1M[0x20000] - 0x200000;
S68K_Fetch[1].lowaddr = 0x0C0000; // Bank 0
S68K_Fetch[1].highaddr = 0x0DFFFF;
S68K_Fetch[1].offset = (unsigned) &Ram_Word_1M[0] - 0x0C0000;
break;
}
}
/*** M68K_Reset_CPU - just reset the main 68K cpu ***/
void
M68K_Reset_CPU ()
{
main68k_reset ();
}
/*** S68K_Reset_CPU - just reset the sub 68K cpu ***/
void
S68K_Reset_CPU ()
{
sub68k_reset ();
}
void _M68K_Set_32X_Rom_Bank ()
__attribute__ ((alias ("M68K_Set_32X_Rom_Bank")));
void _M68K_Set_Prg_Ram () __attribute__ ((alias ("M68K_Set_Prg_Ram")));
void _M68K_32X_Mode () __attribute__ ((alias ("M68K_32X_Mode")));
void _MS68K_Set_Word_Ram (void)
__attribute__ ((alias ("MS68K_Set_Word_Ram")));
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