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Original commit message from CVS: Based on patches by: Johan Dahlin <johan at gnome dot org> Ronald Bultje <rbultje at ronald dot bitfreak dot net> * configure.ac: * gst/nsf/Makefile.am: * gst/nsf/dis6502.h: * gst/nsf/fds_snd.c: * gst/nsf/fds_snd.h: * gst/nsf/fmopl.c: * gst/nsf/fmopl.h: * gst/nsf/gstnsf.c: * gst/nsf/gstnsf.h: * gst/nsf/log.c: * gst/nsf/log.h: * gst/nsf/memguard.c: * gst/nsf/memguard.h: * gst/nsf/mmc5_snd.c: * gst/nsf/mmc5_snd.h: * gst/nsf/nes6502.c: * gst/nsf/nes6502.h: * gst/nsf/nes_apu.c: * gst/nsf/nes_apu.h: * gst/nsf/nsf.c: * gst/nsf/nsf.h: * gst/nsf/osd.h: * gst/nsf/types.h: * gst/nsf/vrc7_snd.c: * gst/nsf/vrc7_snd.h: * gst/nsf/vrcvisnd.c: * gst/nsf/vrcvisnd.h: Added NSF decoder plugin. Fixes 151192.
160 lines
4 KiB
C
160 lines
4 KiB
C
/*
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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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** $Id$
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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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/* Define this to enable decimal mode in ADC / SBC (not needed in NES) */
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/*#define NES6502_DECIMAL*/
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/* number of bank pointers the CPU emulation core handles */
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#ifdef NSF_PLAYER
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#define NES6502_4KBANKS
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#endif
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#ifdef NES6502_4KBANKS
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#define NES6502_NUMBANKS 16
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#define NES6502_BANKSHIFT 12
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#else
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#define NES6502_NUMBANKS 8
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#define NES6502_BANKSHIFT 13
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#endif
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#define NES6502_BANKMASK ((0x10000 / NES6502_NUMBANKS) - 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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int dma_cycles;
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uint32 pc_reg;
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uint8 a_reg, p_reg, x_reg, y_reg, s_reg;
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uint8 int_pending;
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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_init(void);
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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(boolean reset_flag);
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extern void nes6502_setdma(int cycles);
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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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** $Log$
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** Revision 1.1 2006/07/13 15:07:28 wtay
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** Based on patches by: Johan Dahlin <johan at gnome dot org>
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** Ronald Bultje <rbultje at ronald dot bitfreak dot net>
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** * configure.ac:
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** * gst/nsf/Makefile.am:
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** * gst/nsf/dis6502.h:
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** * gst/nsf/fds_snd.c:
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** * gst/nsf/fds_snd.h:
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** * gst/nsf/fmopl.c:
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** * gst/nsf/fmopl.h:
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** * gst/nsf/gstnsf.c:
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** * gst/nsf/gstnsf.h:
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** * gst/nsf/log.c:
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** * gst/nsf/log.h:
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** * gst/nsf/memguard.c:
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** * gst/nsf/memguard.h:
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** * gst/nsf/mmc5_snd.c:
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** * gst/nsf/mmc5_snd.h:
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** * gst/nsf/nes6502.c:
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** * gst/nsf/nes6502.h:
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** * gst/nsf/nes_apu.c:
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** * gst/nsf/nes_apu.h:
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** * gst/nsf/nsf.c:
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** * gst/nsf/nsf.h:
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** * gst/nsf/osd.h:
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** * gst/nsf/types.h:
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** * gst/nsf/vrc7_snd.c:
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** * gst/nsf/vrc7_snd.h:
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** * gst/nsf/vrcvisnd.c:
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** * gst/nsf/vrcvisnd.h:
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** Added NSF decoder plugin. Fixes 151192.
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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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