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fxinst.h
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fxinst.h
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/*
* Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
*
* (c) Copyright 1996 - 2001 Gary Henderson ([email protected]) and
* Jerremy Koot ([email protected])
*
* Super FX C emulator code
* (c) Copyright 1997 - 1999 Ivar ([email protected]) and
* Gary Henderson.
* Super FX assembler emulator code (c) Copyright 1998 zsKnight and _Demo_.
*
* DSP1 emulator code (c) Copyright 1998 Ivar, _Demo_ and Gary Henderson.
* C4 asm and some C emulation code (c) Copyright 2000 zsKnight and _Demo_.
* C4 C code (c) Copyright 2001 Gary Henderson ([email protected]).
*
* DOS port code contains the works of other authors. See headers in
* individual files.
*
* Snes9x homepage: http://www.snes9x.com
*
* Permission to use, copy, modify and distribute Snes9x in both binary and
* source form, for non-commercial purposes, is hereby granted without fee,
* providing that this license information and copyright notice appear with
* all copies and any derived work.
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event shall the authors be held liable for any damages
* arising from the use of this software.
*
* Snes9x is freeware for PERSONAL USE only. Commercial users should
* seek permission of the copyright holders first. Commercial use includes
* charging money for Snes9x or software derived from Snes9x.
*
* The copyright holders request that bug fixes and improvements to the code
* should be forwarded to them so everyone can benefit from the modifications
* in future versions.
*
* Super NES and Super Nintendo Entertainment System are trademarks of
* Nintendo Co., Limited and its subsidiary companies.
*/
#ifndef _FXINST_H_
#define _FXINST_H_ 1
/*
* FxChip(GSU) register space specification
* (Register address space 3000->32ff)
*
* The 16 generic 16 bit registers:
* (Some have a special function in special circumstances)
* 3000 - R0 default source/destination register
* 3002 - R1 pixel plot X position register
* 3004 - R2 pixel plot Y position register
* 3006 - R3
* 3008 - R4 lower 16 bit result of lmult
* 300a - R5
* 300c - R6 multiplier for fmult and lmult
* 300e - R7 fixed point texel X position for merge
* 3010 - R8 fixed point texel Y position for merge
* 3012 - R9
* 3014 - R10
* 3016 - R11 return address set by link
* 3018 - R12 loop counter
* 301a - R13 loop point address
* 301c - R14 rom address for getb, getbh, getbl, getbs
* 301e - R15 program counter
*
* 3020-302f - unused
*
* Other internal registers
* 3030 - SFR status flag register (16bit)
* 3032 - unused
* 3033 - BRAMR Backup RAM register (8bit)
* 3034 - PBR program bank register (8bit)
* 3035 - unused
* 3036 - ROMBR rom bank register (8bit)
* 3037 - CFGR control flags register (8bit)
* 3038 - SCBR screen base register (8bit)
* 3039 - CLSR clock speed register (8bit)
* 303a - SCMR screen mode register (8bit)
* 303b - VCR version code register (8bit) (read only)
* 303c - RAMBR ram bank register (8bit)
* 303d - unused
* 303e - CBR cache base register (16bit)
*
* 3040-30ff - unused
*
* 3100-32ff - CACHERAM 512 bytes of GSU cache memory
*
* SFR status flag register bits:
* 0 -
* 1 Z Zero flag
* 2 CY Carry flag
* 3 S Sign flag
* 4 OV Overflow flag
* 5 G Go flag (set to 1 when the GSU is running)
* 6 R Set to 1 when reading ROM using R14 address
* 7 -
* 8 ALT1 Mode set-up flag for the next instruction
* 9 ALT2 Mode set-up flag for the next instruction
* 10 IL Immediate lower 8-bit flag
* 11 IH Immediate higher 8-bit flag
* 12 B Set to 1 when the WITH instruction is executed
* 13 -
* 14 -
* 15 IRQ Set to 1 when GSU caused an interrupt
* Set to 0 when read by 658c16
*
* BRAMR = 0, BackupRAM is disabled
* BRAMR = 1, BackupRAM is enabled
*
* CFGR control flags register bits:
* 0 -
* 1 -
* 2 -
* 3 -
* 4 -
* 5 MS0 Multiplier speed, 0=standard, 1=high speed
* 6 -
* 7 IRQ Set to 1 when GSU interrupt request is masked
*
* CLSR clock speed register bits:
* 0 CLSR clock speed, 0 = 10.7Mhz, 1 = 21.4Mhz
*
* SCMR screen mode register bits:
* 0 MD0 color depth mode bit 0
* 1 MD1 color depth mode bit 1
* 2 HT0 screen height bit 1
* 3 RAN RAM access control
* 4 RON ROM access control
* 5 HT1 screen height bit 2
* 6 -
* 7 -
*
* RON = 0 SNES CPU has ROM access
* RON = 1 GSU has ROM access
*
* RAN = 0 SNES has game pak RAM access
* RAN = 1 GSU has game pak RAM access
*
* HT1 HT0 Screen height mode
* 0 0 128 pixels high
* 0 1 160 pixels high
* 1 0 192 pixels high
* 1 1 OBJ mode
*
* MD1 MD0 Color depth mode
* 0 0 4 color mode
* 0 1 16 color mode
* 1 0 not used
* 1 1 256 color mode
*
* CBR cache base register bits:
* 15-4 Specify base address for data to cache from ROM or RAM
* 3-0 Are 0 when address is read
*
* Write access to the program counter (301e) from
* the SNES-CPU will start the GSU, and it will not
* stop until it reaches a stop instruction.
*
*/
/* Number of banks in GSU RAM */
#define FX_RAM_BANKS 4
/* Emulate proper R14 ROM access (slower, but safer) */
/* #define FX_DO_ROMBUFFER */
/* Address checking (definately slow) */
/* #define FX_ADDRESS_CHECK */
struct FxRegs_s
{
/* FxChip registers */
uint32 avReg[16]; /* 16 Generic registers */
uint32 vColorReg; /* Internal color register */
uint32 vPlotOptionReg; /* Plot option register */
uint32 vStatusReg; /* Status register */
uint32 vPrgBankReg; /* Program bank index register */
uint32 vRomBankReg; /* Rom bank index register */
uint32 vRamBankReg; /* Ram bank index register */
uint32 vCacheBaseReg; /* Cache base address register */
uint32 vCacheFlags; /* Saying what parts of the cache was written to */
uint32 vLastRamAdr; /* Last RAM address accessed */
uint32 * pvDreg; /* Pointer to current destination register */
uint32 * pvSreg; /* Pointer to current source register */
uint8 vRomBuffer; /* Current byte read by R14 */
uint8 vPipe; /* Instructionset pipe */
uint32 vPipeAdr; /* The address of where the pipe was read from */
/* status register optimization stuff */
uint32 vSign; /* v & 0x8000 */
uint32 vZero; /* v == 0 */
uint32 vCarry; /* a value of 1 or 0 */
int32 vOverflow; /* (v >= 0x8000 || v < -0x8000) */
/* Other emulator variables */
int32 vErrorCode;
uint32 vIllegalAddress;
uint8 bBreakPoint;
uint32 vBreakPoint;
uint32 vStepPoint;
uint8 * pvRegisters; /* 768 bytes located in the memory at address 0x3000 */
uint32 nRamBanks; /* Number of 64kb-banks in FxRam (Don't confuse it with SNES-Ram!!!) */
uint8 * pvRam; /* Pointer to FxRam */
uint32 nRomBanks; /* Number of 32kb-banks in Cart-ROM */
uint8 * pvRom; /* Pointer to Cart-ROM */
uint32 vMode; /* Color depth/mode */
uint32 vPrevMode; /* Previous depth */
uint8 * pvScreenBase;
uint8 * apvScreen[32]; /* Pointer to each of the 32 screen colums */
int x[32];
uint32 vScreenHeight; /* 128, 160, 192 or 256 (could be overriden by cmode) */
uint32 vScreenRealHeight; /* 128, 160, 192 or 256 */
uint32 vPrevScreenHeight;
uint32 vScreenSize;
void (*pfPlot)();
void (*pfRpix)();
uint8 * pvRamBank; /* Pointer to current RAM-bank */
uint8 * pvRomBank; /* Pointer to current ROM-bank */
uint8 * pvPrgBank; /* Pointer to current program ROM-bank */
uint8 * apvRamBank[FX_RAM_BANKS];/* Ram bank table (max 256kb) */
uint8 * apvRomBank[256]; /* Rom bank table */
uint8 bCacheActive;
uint8 * pvCache; /* Pointer to the GSU cache */
uint8 avCacheBackup[512]; /* Backup of ROM when the cache has replaced it */
uint32 vCounter;
uint32 vInstCount;
};
/* GSU registers */
#define GSU_R0 0x000
#define GSU_R1 0x002
#define GSU_R2 0x004
#define GSU_R3 0x006
#define GSU_R4 0x008
#define GSU_R5 0x00a
#define GSU_R6 0x00c
#define GSU_R7 0x00e
#define GSU_R8 0x010
#define GSU_R9 0x012
#define GSU_R10 0x014
#define GSU_R11 0x016
#define GSU_R12 0x018
#define GSU_R13 0x01a
#define GSU_R14 0x01c
#define GSU_R15 0x01e
#define GSU_SFR 0x030
#define GSU_BRAMR 0x033
#define GSU_PBR 0x034
#define GSU_ROMBR 0x036
#define GSU_CFGR 0x037
#define GSU_SCBR 0x038
#define GSU_CLSR 0x039
#define GSU_SCMR 0x03a
#define GSU_VCR 0x03b
#define GSU_RAMBR 0x03c
#define GSU_CBR 0x03e
#define GSU_CACHERAM 0x100
/* SFR flags */
#define FLG_Z (1<<1)
#define FLG_CY (1<<2)
#define FLG_S (1<<3)
#define FLG_OV (1<<4)
#define FLG_G (1<<5)
#define FLG_R (1<<6)
#define FLG_ALT1 (1<<8)
#define FLG_ALT2 (1<<9)
#define FLG_IL (1<<10)
#define FLG_IH (1<<11)
#define FLG_B (1<<12)
#define FLG_IRQ (1<<15)
/* Test flag */
#define TF(a) (GSU.vStatusReg & FLG_##a )
#define CF(a) (GSU.vStatusReg &= ~FLG_##a )
#define SF(a) (GSU.vStatusReg |= FLG_##a )
/* Test and set flag if condition, clear if not */
#define TS(a,b) GSU.vStatusReg = ( (GSU.vStatusReg & (~FLG_##a)) | ( (!!(##b)) * FLG_##a ) )
/* Testing ALT1 & ALT2 bits */
#define ALT0 (!TF(ALT1)&&!TF(ALT2))
#define ALT1 (TF(ALT1)&&!TF(ALT2))
#define ALT2 (!TF(ALT1)&&TF(ALT2))
#define ALT3 (TF(ALT1)&&TF(ALT2))
/* Sign extend from 8/16 bit to 32 bit */
#define SEX16(a) ((int32)((int16)(a)))
#define SEX8(a) ((int32)((int8)(a)))
/* Unsign extend from 8/16 bit to 32 bit */
#define USEX16(a) ((uint32)((uint16)(a)))
#define USEX8(a) ((uint32)((uint8)(a)))
#define SUSEX16(a) ((int32)((uint16)(a)))
/* Set/Clr Sign and Zero flag */
#define TSZ(num) TS(S, (num & 0x8000)); TS(Z, (!USEX16(num)) )
/* Clear flags */
#define CLRFLAGS GSU.vStatusReg &= ~(FLG_ALT1|FLG_ALT2|FLG_B); GSU.pvDreg = GSU.pvSreg = &R0;
/* Read current RAM-Bank */
#define RAM(adr) GSU.pvRamBank[USEX16(adr)]
/* Read current ROM-Bank */
#define ROM(idx) (GSU.pvRomBank[USEX16(idx)])
/* Access the current value in the pipe */
#define PIPE GSU.vPipe
/* Access data in the current program bank */
#define PRGBANK(idx) GSU.pvPrgBank[USEX16(idx)]
/* Update pipe from ROM */
#if 0
#define FETCHPIPE { PIPE = PRGBANK(R15); GSU.vPipeAdr = (GSU.vPrgBankReg<<16) + R15; }
#else
#define FETCHPIPE { PIPE = PRGBANK(R15); }
#endif
/* ABS */
#define ABS(x) ((x)<0?-(x):(x))
/* Access source register */
#define SREG (*GSU.pvSreg)
/* Access destination register */
#define DREG (*GSU.pvDreg)
#ifndef FX_DO_ROMBUFFER
/* Don't read R14 */
#define READR14
/* Don't test and/or read R14 */
#define TESTR14
#else
/* Read R14 */
#define READR14 GSU.vRomBuffer = ROM(R14)
/* Test and/or read R14 */
#define TESTR14 if(GSU.pvDreg == &R14) READR14
#endif
/* Access to registers */
#define R0 GSU.avReg[0]
#define R1 GSU.avReg[1]
#define R2 GSU.avReg[2]
#define R3 GSU.avReg[3]
#define R4 GSU.avReg[4]
#define R5 GSU.avReg[5]
#define R6 GSU.avReg[6]
#define R7 GSU.avReg[7]
#define R8 GSU.avReg[8]
#define R9 GSU.avReg[9]
#define R10 GSU.avReg[10]
#define R11 GSU.avReg[11]
#define R12 GSU.avReg[12]
#define R13 GSU.avReg[13]
#define R14 GSU.avReg[14]
#define R15 GSU.avReg[15]
#define SFR GSU.vStatusReg
#define PBR GSU.vPrgBankReg
#define ROMBR GSU.vRomBankReg
#define RAMBR GSU.vRamBankReg
#define CBR GSU.vCacheBaseReg
#define SCBR USEX8(GSU.pvRegisters[GSU_SCBR])
#define SCMR USEX8(GSU.pvRegisters[GSU_SCMR])
#define COLR GSU.vColorReg
#define POR GSU.vPlotOptionReg
#define BRAMR USEX8(GSU.pvRegisters[GSU_BRAMR])
#define VCR USEX8(GSU.pvRegisters[GSU_VCR])
#define CFGR USEX8(GSU.pvRegisters[GSU_CFGR])
#define CLSR USEX8(GSU.pvRegisters[GSU_CLSR])
/* Execute instruction from the pipe, and fetch next byte to the pipe */
#define FX_STEP { \
uint32 vOpcode = (uint32)PIPE; \
FETCHPIPE; \
(*fx_ppfOpcodeTable[ (GSU.vStatusReg & 0x300) | vOpcode ])(); \
} \
#define FX_FUNCTION_RUN 0
#define FX_FUNCTION_RUN_TO_BREAKPOINT 1
#define FX_FUNCTION_STEP_OVER 2
extern uint32 (**fx_ppfFunctionTable)(uint32);
extern void (**fx_ppfPlotTable)();
extern void (**fx_ppfOpcodeTable)();
extern uint32 (*fx_apfFunctionTable[])(uint32);
extern void (*fx_apfOpcodeTable[])();
extern void (*fx_apfPlotTable[])();
extern uint32 (*fx_a_apfFunctionTable[])(uint32);
extern void (*fx_a_apfOpcodeTable[])();
extern void (*fx_a_apfPlotTable[])();
extern uint32 (*fx_r_apfFunctionTable[])(uint32);
extern void (*fx_r_apfOpcodeTable[])();
extern void (*fx_r_apfPlotTable[])();
extern uint32 (*fx_ar_apfFunctionTable[])(uint32);
extern void (*fx_ar_apfOpcodeTable[])();
extern void (*fx_ar_apfPlotTable[])();
/* Set this define if branches are relative to the instruction in the delay slot */
/* (I think they are) */
#define BRANCH_DELAY_RELATIVE
#endif