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/*
* Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
*
* (c) Copyright 1996 - 2001 Gary Henderson (gary.henderson@ntlworld.com) and
* Jerremy Koot (jkoot@snes9x.com)
*
* Super FX C emulator code
* (c) Copyright 1997 - 1999 Ivar (ivar@snes9x.com) 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 (gary.henderson@ntlworld.com).
*
* 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 holder:s 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 USE_SA1
#define _sa1_h_
#endif
#ifndef _sa1_h_
#define _sa1_h_
#include "memmap.h"
struct SSA1Registers {
uint8 PB;
uint8 DB;
pair P;
pair A;
pair D;
pair S;
pair X;
pair Y;
uint16 PC;
};
struct SSA1 {
struct SOpcodes *S9xOpcodes;
uint8 _Carry;
uint8 _Zero;
uint8 _Negative;
uint8 _Overflow;
bool8 CPUExecuting;
uint32 ShiftedPB;
uint32 ShiftedDB;
uint32 Flags;
bool8 Executing;
bool8 NMIActive;
bool8 IRQActive;
bool8 WaitingForInterrupt;
bool8 Waiting;
// uint8 WhichEvent;
uint8 *PC;
uint8 *PCBase;
uint8 *BWRAM;
uint8 *PCAtOpcodeStart;
uint8 *WaitAddress;
uint32 WaitCounter;
uint8 *WaitByteAddress1;
uint8 *WaitByteAddress2;
// long Cycles;
// long NextEvent;
// long V_Counter;
int16 op1;
int16 op2;
int arithmetic_op;
int64 sum;
bool8 overflow;
uint8 VirtualBitmapFormat;
bool8 in_char_dma;
uint8 variable_bit_pos;
};
extern struct SSA1Registers SA1Registers;
extern struct SSA1 SA1;
extern uint8 *SA1_Map [MEMMAP_NUM_BLOCKS];
extern uint8 *SA1_WriteMap [MEMMAP_NUM_BLOCKS];
#ifdef USE_SA1
#define SA1CheckZero() (SA1._Zero == 0)
#define SA1CheckCarry() (SA1._Carry)
#define SA1CheckIRQ() (SA1Registers.PL & IRQ)
#define SA1CheckDecimal() (SA1Registers.PL & Decimal)
#define SA1CheckIndex() (SA1Registers.PL & IndexFlag)
#define SA1CheckMemory() (SA1Registers.PL & MemoryFlag)
#define SA1CheckOverflow() (SA1._Overflow)
#define SA1CheckNegative() (SA1._Negative & 0x80)
#define SA1CheckEmulation() (SA1Registers.P.W & Emulation)
#define SA1ClearFlags(f) (SA1Registers.P.W &= ~(f))
#define SA1SetFlags(f) (SA1Registers.P.W |= (f))
#define SA1CheckFlag(f) (SA1Registers.PL & (f))
START_EXTERN_C
uint8 S9xSA1GetByte (uint32);
//uint16 S9xSA1GetWord (uint32);
#define S9xSA1GetWord(address) (S9xSA1GetByte(address) | (S9xSA1GetByte(address+1) << 8))
void S9xSA1SetByte (uint8, uint32);
//void S9xSA1SetWord (uint16, uint32);
#define S9xSA1SetWord(word, address) S9xSA1SetByte(word, address); S9xSA1SetByte(word >> 8, address+1);
void S9xSA1SetPCBase (uint32);
uint8 S9xGetSA1 (uint32);
void S9xSetSA1 (uint8, uint32);
extern struct SOpcodes S9xSA1OpcodesM1X1 [256];
extern struct SOpcodes S9xSA1OpcodesM1X0 [256];
extern struct SOpcodes S9xSA1OpcodesM0X1 [256];
extern struct SOpcodes S9xSA1OpcodesM0X0 [256];
void S9xSA1MainLoop ();
void S9xSA1Init ();
void S9xFixSA1AfterSnapshotLoad ();
void S9xSA1ExecuteDuringSleep ();
END_EXTERN_C
#define SNES_IRQ_SOURCE (1 << 7)
#define TIMER_IRQ_SOURCE (1 << 6)
#define DMA_IRQ_SOURCE (1 << 5)
STATIC inline void S9xSA1UnpackStatus()
{
SA1._Zero = (SA1Registers.PL & Zero) == 0;
SA1._Negative = (SA1Registers.PL & Negative);
SA1._Carry = (SA1Registers.PL & Carry);
SA1._Overflow = (SA1Registers.PL & Overflow) >> 6;
}
STATIC inline void S9xSA1PackStatus()
{
SA1Registers.PL &= ~(Zero | Negative | Carry | Overflow);
SA1Registers.PL |= SA1._Carry | ((SA1._Zero == 0) << 1) |
(SA1._Negative & 0x80) | (SA1._Overflow << 6);
}
STATIC inline void S9xSA1FixCycles ()
{
if (SA1CheckEmulation ())
SA1.S9xOpcodes = S9xSA1OpcodesM1X1;
else
if (SA1CheckMemory ())
{
if (SA1CheckIndex ())
SA1.S9xOpcodes = S9xSA1OpcodesM1X1;
else
SA1.S9xOpcodes = S9xSA1OpcodesM1X0;
}
else
{
if (SA1CheckIndex ())
SA1.S9xOpcodes = S9xSA1OpcodesM0X1;
else
SA1.S9xOpcodes = S9xSA1OpcodesM0X0;
}
}
#endif // USE_SA1
#endif
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