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Original commit message from CVS: Patch by: Andreas Henriksson <andreas at fatal dot set> * 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/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: Update our internal nosefart to nosefart-2.7-mls to fix segfaults on some files. Fixes bug #498237. Remove some // comments, fix some compiler warnings and use pow() instead of a slow, selfmade implementation.
189 lines
5 KiB
C
189 lines
5 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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/* straitm */
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#include "types.h"
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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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/* Add memory access control flags. This is a ram shadow memory that holds
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* for each memory bytes access flags for read, write and execute access.
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* The nes6502_mem_access holds all new access (all mode all location). It is
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* used to determine if the player has loop in playing time calculation.
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*/
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#ifdef NES6502_MEM_ACCESS_CTRL
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extern uint8 nes6502_mem_access;
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# define NES6502_READ_ACCESS 1
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# define NES6502_WRITE_ACCESS 2
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# define NES6502_EXE_ACCESS 4
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#endif /* #ifdef NES6502_MEM_ACCESS_CTRL */
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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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#ifdef NES6502_MEM_ACCESS_CTRL
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uint8 * acc_mem_page[NES6502_NUMBANKS]; /* memory access page pointer */
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#endif
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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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#ifdef NES6502_MEM_ACCESS_CTRL
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extern void nes6502_chk_mem_access(uint8 * access, int flags);
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#else
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#define nes6502_chk_mem_access(access,flags)
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#endif
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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 1.2 2008/03/25 15:56:12 slomo
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** Patch by: Andreas Henriksson <andreas at fatal dot set>
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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/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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** Update our internal nosefart to nosefart-2.7-mls to fix segfaults
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** on some files. Fixes bug #498237.
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** Remove some // comments, fix some compiler warnings and use pow()
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** instead of a slow, selfmade implementation.
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**
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** Revision 1.2 2003/05/01 22:34:19 benjihan
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** New NSF plugin
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**
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** Revision 1.1 2003/04/08 20:53:00 ben
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** Adding more files...
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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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