[fceu.git] / x6502.h

/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2002 Ben Parnell
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

typedef struct {
        int32 count;            /* Cycle counter           */
        int32 tcount;           /* Temporary cycle counter */
        uint16 PC;		/* I'll change this to uint32 later... */
				/* I'll need to AND PC after increments to 0xFFFF */
				/* when I do, though.  Perhaps an IPC() macro? */
        uint8 A,X,Y,S,P,mooPI,PZ;
        uint8 DB;               /* Data bus "cache" for reads from certain areas */
	uint8 IRQlow;		/* Simulated IRQ pin held low(or is it high?). */
	uint8 jammed;
} X6502;

extern X6502 X;

#define N_FLAG  0x80
#define V_FLAG  0x40
#define U_FLAG  0x20
#define B_FLAG  0x10
#define D_FLAG  0x08
#define I_FLAG  0x04
#define Z_FLAG  0x02
#define C_FLAG  0x01

extern uint32 timestamp;
extern void FP_FASTAPASS(1) (*MapIRQHook)(int a);

#define NTSC_CPU 1789772.7272727272727272
#define PAL_CPU  1662607.125

#define FCEU_IQEXT      0x01
#define FCEU_IQNMI	0x08
#define FCEU_IQDPCM     0x10
#define FCEU_IQFCOUNT   0x20
#define FCEU_IQTEMP     0x80

void X6502_Reset(void);
void X6502_Power(void);
#define X6502_Run(c) \
{ \
 int32 cycles = (c) << 4; /* *16 */ \
 if (PAL) cycles -= (c);  /* *15 */ \
 X.count+=cycles; \
 if (X.count > 0) X6502_Run_(); \
}
void X6502_Run_(void);


void TriggerIRQ(void);
void TriggerNMI(void);
void TriggerNMINSF(void);

void FASTAPASS(1) X6502_AddCycles(int x);
void FASTAPASS(1) X6502_IRQBegin(int w);
void FASTAPASS(1) X6502_IRQEnd(int w);
Commit	Line	Data
c62d2810	1	/* FCE Ultra - NES/Famicom Emulator
	2	*
	3	* Copyright notice for this file:
	4	* Copyright (C) 2002 Ben Parnell
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*/
	20
	21	typedef struct {
	22	int32 count; /* Cycle counter */
	23	int32 tcount; /* Temporary cycle counter */
	24	uint16 PC; /* I'll change this to uint32 later... */
	25	/* I'll need to AND PC after increments to 0xFFFF */
	26	/* when I do, though. Perhaps an IPC() macro? */
	27	uint8 A,X,Y,S,P,mooPI,PZ;
	28	uint8 DB; /* Data bus "cache" for reads from certain areas */
	29	uint8 IRQlow; /* Simulated IRQ pin held low(or is it high?). */
	30	uint8 jammed;
	31	} X6502;
	32
	33	extern X6502 X;
	34
	35	#define N_FLAG 0x80
	36	#define V_FLAG 0x40
	37	#define U_FLAG 0x20
	38	#define B_FLAG 0x10
	39	#define D_FLAG 0x08
	40	#define I_FLAG 0x04
	41	#define Z_FLAG 0x02
	42	#define C_FLAG 0x01
	43
	44	extern uint32 timestamp;
	45	extern void FP_FASTAPASS(1) (*MapIRQHook)(int a);
	46
	47	#define NTSC_CPU 1789772.7272727272727272
	48	#define PAL_CPU 1662607.125
	49
	50	#define FCEU_IQEXT 0x01
	51	#define FCEU_IQNMI 0x08
	52	#define FCEU_IQDPCM 0x10
	53	#define FCEU_IQFCOUNT 0x20
	54	#define FCEU_IQTEMP 0x80
	55
	56	void X6502_Reset(void);
	57	void X6502_Power(void);
937bf65b	58	#define X6502_Run(c) \
	59	{ \
	60	int32 cycles = (c) << 4; /* 16 / \
	61	if (PAL) cycles -= (c); /* 15 / \
	62	X.count+=cycles; \
	63	if (X.count > 0) X6502_Run_(); \
	64	}
	65	void X6502_Run_(void);
	66
c62d2810	67
	68	void TriggerIRQ(void);
	69	void TriggerNMI(void);
	70	void TriggerNMINSF(void);
	71
	72	void FASTAPASS(1) X6502_AddCycles(int x);
	73	void FASTAPASS(1) X6502_IRQBegin(int w);
	74	void FASTAPASS(1) X6502_IRQEnd(int w);
937bf65b	75