kopia lustrzana https://github.com/Jean-MarcHarvengt/MCUME
176 wiersze
4.5 KiB
C
Executable File
176 wiersze
4.5 KiB
C
Executable File
/*
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** Nofrendo (c) 1998-2000 Matthew Conte (matt@conte.com)
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**
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**
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** This program is free software; you can redistribute it and/or
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** modify it under the terms of version 2 of the GNU Library General
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** Public License as published by the Free Software Foundation.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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** Library General Public License for more details. To obtain a
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** copy of the GNU Library General Public License, write to the Free
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** Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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**
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** Any permitted reproduction of these routines, in whole or in part,
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** must bear this legend.
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**
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**
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** nes6502.h
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**
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** NES custom 6502 CPU definitions / prototypes
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** $Id: nes6502.h,v 1.2 2001/04/27 14:37:11 neil Exp $
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*/
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/* NOTE: 16-bit addresses avoided like the plague: use 32-bit values
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** wherever humanly possible
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*/
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#ifndef _NES6502_H_
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#define _NES6502_H_
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#include "noftypes.h"
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/* Define this to enable decimal mode in ADC / SBC (not needed in NES) */
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/*#define NES6502_DECIMAL*/
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#define NES6502_NUMBANKS 16
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#define NES6502_BANKSHIFT 12
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#define NES6502_BANKSIZE (0x10000 / NES6502_NUMBANKS)
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#define NES6502_BANKMASK (NES6502_BANKSIZE - 1)
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/* P (flag) register bitmasks */
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#define N_FLAG 0x80
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#define V_FLAG 0x40
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#define R_FLAG 0x20 /* Reserved, always 1 */
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#define B_FLAG 0x10
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#define D_FLAG 0x08
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#define I_FLAG 0x04
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#define Z_FLAG 0x02
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#define C_FLAG 0x01
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/* Vector addresses */
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#define NMI_VECTOR 0xFFFA
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#define RESET_VECTOR 0xFFFC
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#define IRQ_VECTOR 0xFFFE
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/* cycle counts for interrupts */
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#define INT_CYCLES 7
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#define RESET_CYCLES 6
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#define NMI_MASK 0x01
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#define IRQ_MASK 0x02
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/* Stack is located on 6502 page 1 */
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#define STACK_OFFSET 0x0100
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typedef struct
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{
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uint32 min_range, max_range;
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uint8 (*read_func)(uint32 address);
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} nes6502_memread;
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typedef struct
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{
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uint32 min_range, max_range;
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void (*write_func)(uint32 address, uint8 value);
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} nes6502_memwrite;
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typedef struct
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{
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uint8 *mem_page[NES6502_NUMBANKS]; /* memory page pointers */
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nes6502_memread *read_handler;
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nes6502_memwrite *write_handler;
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uint32 pc_reg;
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uint8 a_reg, p_reg;
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uint8 x_reg, y_reg;
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uint8 s_reg;
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uint8 jammed; /* is processor jammed? */
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uint8 int_pending, int_latency;
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int32 total_cycles, burn_cycles;
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} nes6502_context;
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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/* Functions which govern the 6502's execution */
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extern void nes6502_reset(void);
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extern int nes6502_execute(int total_cycles);
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extern void nes6502_nmi(void);
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extern void nes6502_irq(void);
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extern uint8 nes6502_getbyte(uint32 address);
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extern uint32 nes6502_getcycles(bool reset_flag);
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extern void nes6502_burn(int cycles);
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extern void nes6502_release(void);
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/* Context get/set */
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extern void nes6502_setcontext(nes6502_context *cpu);
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extern void nes6502_getcontext(nes6502_context *cpu);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* _NES6502_H_ */
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/*
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** $Log: nes6502.h,v $
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** Revision 1.2 2001/04/27 14:37:11 neil
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** wheeee
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**
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** Revision 1.1 2001/04/27 12:54:39 neil
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** blah
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**
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** Revision 1.1.1.1 2001/04/27 07:03:54 neil
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** initial
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**
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** Revision 1.17 2000/11/13 00:57:39 matt
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** trying to add 1-instruction interrupt latency... and failing.
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**
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** Revision 1.16 2000/10/27 12:53:36 matt
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** banks are always 4kB now
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**
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** Revision 1.15 2000/10/10 13:58:14 matt
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** stroustrup squeezing his way in the door
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**
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** Revision 1.14 2000/09/15 03:42:32 matt
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** nes6502_release to release current timeslice
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**
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** Revision 1.13 2000/09/11 03:55:32 matt
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** cosmetics
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**
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** Revision 1.12 2000/09/08 11:54:48 matt
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** optimize
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**
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** Revision 1.11 2000/09/07 21:58:18 matt
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** api change for nes6502_burn, optimized core
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**
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** Revision 1.10 2000/09/07 01:34:55 matt
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** nes6502_init deprecated, moved flag regs to separate vars
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**
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** Revision 1.9 2000/08/28 12:53:44 matt
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** fixes for disassembler
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**
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** Revision 1.8 2000/08/28 01:46:15 matt
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** moved some of them defines around, cleaned up jamming code
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**
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** Revision 1.7 2000/08/16 04:56:37 matt
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** accurate CPU jamming, added dead page emulation
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**
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** Revision 1.6 2000/07/30 04:32:00 matt
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** now emulates the NES frame IRQ
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**
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** Revision 1.5 2000/07/17 01:52:28 matt
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** made sure last line of all source files is a newline
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**
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** Revision 1.4 2000/06/09 15:12:25 matt
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** initial revision
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**
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*/
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