mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-10-27 00:29:39 -04:00
191 lines
4.5 KiB
C
191 lines
4.5 KiB
C
/*****************************************************************************/
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/* FAME Fast and Accurate Motorola 68000 Emulation Core */
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/* (c) 2005 Oscar Orallo Pelaez */
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/* Version: 1.24 */
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/* Date: 08-20-2005 */
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/* See FAME.HTML for documentation and license information */
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/*****************************************************************************/
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#ifndef __FAME_H__
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#define __FAME_H__
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// uintptr_t
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#include <stdlib.h>
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#ifndef _MSC_VER
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#include <stdint.h>
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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// PicoDrive hacks
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#define FAMEC_FETCHBITS 8
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#define M68K_FETCHBANK1 (1 << FAMEC_FETCHBITS)
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//#define M68K_RUNNING 0x01
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#define FM68K_HALTED 0x80
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//#define M68K_WAITING 0x04
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//#define M68K_DISABLE 0x20
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//#define M68K_FAULTED 0x40
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#define FM68K_EMULATE_GROUP_0 0x02
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#define FM68K_EMULATE_TRACE 0x08
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#define FM68K_DO_TRACE 0x10
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/************************************/
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/* General library defines */
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/************************************/
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#ifndef M68K_OK
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#define M68K_OK 0
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#endif
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#ifndef M68K_RUNNING
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#define M68K_RUNNING 1
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#endif
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#ifndef M68K_NO_SUP_ADDR_SPACE
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#define M68K_NO_SUP_ADDR_SPACE 2
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#endif
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#ifndef M68K_DOUBLE_BUS_FAULT
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#define M68K_DOUBLE_BUS_FAULT -1
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#endif
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#ifndef M68K_INV_REG
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#define M68K_INV_REG -1
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#endif
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/* Hardware interrupt state */
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#ifndef M68K_IRQ_LEVEL_ERROR
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#define M68K_IRQ_LEVEL_ERROR -1
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#endif
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#ifndef M68K_IRQ_INV_PARAMS
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#define M68K_IRQ_INV_PARAMS -2
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#endif
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/* Defines to specify hardware interrupt type */
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#ifndef M68K_AUTOVECTORED_IRQ
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#define M68K_AUTOVECTORED_IRQ -1
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#endif
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#ifndef M68K_SPURIOUS_IRQ
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#define M68K_SPURIOUS_IRQ -2
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#endif
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#ifndef M68K_AUTO_LOWER_IRQ
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#define M68K_AUTO_LOWER_IRQ 1
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#endif
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#ifndef M68K_MANUAL_LOWER_IRQ
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#define M68K_MANUAL_LOWER_IRQ 0
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#endif
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/* Defines to specify address space */
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#ifndef M68K_SUP_ADDR_SPACE
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#define M68K_SUP_ADDR_SPACE 0
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#endif
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#ifndef M68K_USER_ADDR_SPACE
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#define M68K_USER_ADDR_SPACE 2
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#endif
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#ifndef M68K_PROG_ADDR_SPACE
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#define M68K_PROG_ADDR_SPACE 0
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#endif
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#ifndef M68K_DATA_ADDR_SPACE
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#define M68K_DATA_ADDR_SPACE 1
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#endif
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/*******************/
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/* Data definition */
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/*******************/
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#include <pico/pico_port.h>
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/*
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typedef unsigned char u8;
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typedef signed char s8;
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typedef unsigned short u16;
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typedef signed short s16;
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typedef unsigned int u32;
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typedef signed int s32;
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*/
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typedef union
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{
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u8 B[4];
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s8 SB[4];
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u16 W[2];
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s16 SW[2];
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u32 D;
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s32 SD;
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} famec_union32;
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/* M68K CPU CONTEXT */
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typedef struct
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{
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unsigned int (*read_byte )(unsigned int a);
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unsigned int (*read_word )(unsigned int a);
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unsigned int (*read_long )(unsigned int a);
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void (*write_byte)(unsigned int a,unsigned char d);
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void (*write_word)(unsigned int a,unsigned short d);
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void (*write_long)(unsigned int a,unsigned int d);
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void (*reset_handler)(void);
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void (*iack_handler)(unsigned level);
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famec_union32 dreg[8];
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famec_union32 areg[8];
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unsigned asp;
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unsigned pc;
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unsigned char interrupts[8];
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unsigned short sr;
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unsigned short execinfo;
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// PD extension
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int io_cycle_counter; // cycles left
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unsigned int Opcode;
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signed int cycles_needed;
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unsigned short *PC;
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uintptr_t BasePC;
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unsigned int flag_C;
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unsigned int flag_V;
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unsigned int flag_NotZ;
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unsigned int flag_N;
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unsigned int flag_X;
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unsigned int flag_T;
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unsigned int flag_S;
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unsigned int flag_I;
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unsigned char not_polling;
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unsigned char pad[3];
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uintptr_t Fetch[M68K_FETCHBANK1];
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} M68K_CONTEXT;
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typedef enum
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{
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fm68k_reason_emulate = 0,
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fm68k_reason_init,
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fm68k_reason_idle_install,
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fm68k_reason_idle_remove,
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} fm68k_call_reason;
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/************************/
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/* Function definition */
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/************************/
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/* General purpose functions */
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void fm68k_init(void);
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int fm68k_reset(M68K_CONTEXT *ctx);
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int fm68k_emulate(M68K_CONTEXT *ctx, int n, fm68k_call_reason reason);
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int fm68k_would_interrupt(M68K_CONTEXT *ctx); // to be called from fm68k_emulate()
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u32 fm68k_get_pc(const M68K_CONTEXT *ctx);
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// PICODRIVE_HACK
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int fm68k_idle_install(void);
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int fm68k_idle_remove(void);
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#ifdef __cplusplus
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}
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#endif
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#endif
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