mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-05 07:17:45 -04:00
70357ce525
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@276 be3aeb3a-fb24-0410-a615-afba39da0efa
186 lines
4.5 KiB
C
186 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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#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 M68K_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 M68K_EMULATE_GROUP_0 0x02
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#define M68K_EMULATE_TRACE 0x08
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#define M68K_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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/* M68K registers */
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typedef enum {
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M68K_REG_D0=0,
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M68K_REG_D1,
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M68K_REG_D2,
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M68K_REG_D3,
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M68K_REG_D4,
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M68K_REG_D5,
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M68K_REG_D6,
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M68K_REG_D7,
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M68K_REG_A0,
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M68K_REG_A1,
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M68K_REG_A2,
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M68K_REG_A3,
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M68K_REG_A4,
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M68K_REG_A5,
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M68K_REG_A6,
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M68K_REG_A7,
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M68K_REG_ASP,
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M68K_REG_PC,
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M68K_REG_SR
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} m68k_register;
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typedef union
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{
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unsigned char B;
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signed char SB;
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unsigned short W;
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signed short SW;
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unsigned int D;
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signed int SD;
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} famec_union32;
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/* The memory blocks must be in native (Motorola) format */
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struct M68K_PROGRAM {
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unsigned low_addr;
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unsigned high_addr;
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unsigned offset;
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};
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/* The memory blocks must be in native (Motorola) format */
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struct M68K_DATA {
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unsigned low_addr;
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unsigned high_addr;
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void *mem_handler;
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void *data;
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};
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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 Fetch[M68K_FETCHBANK1];
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} M68K_CONTEXT;
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extern M68K_CONTEXT *g_m68kcontext;
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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 m68k_init(void);
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int m68k_reset(void);
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int m68k_emulate(int n);
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unsigned m68k_get_pc(M68K_CONTEXT *context);
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unsigned m68k_get_register(M68K_CONTEXT *context, m68k_register reg);
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unsigned m68k_set_register(M68K_CONTEXT *context, m68k_register reg, unsigned value);
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#ifdef __cplusplus
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}
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#endif
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#endif
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