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https://github.com/libretro/snes9x.git
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149 lines
3.6 KiB
C
149 lines
3.6 KiB
C
/*****************************************************************************\
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Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
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This file is licensed under the Snes9x License.
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For further information, consult the LICENSE file in the root directory.
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\*****************************************************************************/
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#ifndef _SA1_H_
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#define _SA1_H_
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struct SSA1Registers
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{
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uint8 DB;
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pair P;
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pair A;
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pair D;
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pair S;
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pair X;
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pair Y;
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PC_t PC;
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};
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struct SSA1
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{
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struct SOpcodes *S9xOpcodes;
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uint8 *S9xOpLengths;
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uint8 _Carry;
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uint8 _Zero;
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uint8 _Negative;
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uint8 _Overflow;
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uint32 ShiftedPB;
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uint32 ShiftedDB;
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uint32 Flags;
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int32 Cycles;
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int32 PrevCycles;
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uint8 *PCBase;
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bool8 WaitingForInterrupt;
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uint8 *Map[MEMMAP_NUM_BLOCKS];
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uint8 *WriteMap[MEMMAP_NUM_BLOCKS];
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uint8 *BWRAM;
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bool8 in_char_dma;
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bool8 TimerIRQLastState;
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uint16 HTimerIRQPos;
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uint16 VTimerIRQPos;
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int16 HCounter;
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int16 VCounter;
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int16 PrevHCounter;
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int32 MemSpeed;
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int32 MemSpeedx2;
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int32 arithmetic_op;
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uint16 op1;
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uint16 op2;
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uint64 sum;
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bool8 overflow;
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uint8 VirtualBitmapFormat;
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uint8 variable_bit_pos;
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};
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#define SA1CheckCarry() (SA1._Carry)
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#define SA1CheckZero() (SA1._Zero == 0)
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#define SA1CheckIRQ() (SA1Registers.PL & IRQ)
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#define SA1CheckDecimal() (SA1Registers.PL & Decimal)
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#define SA1CheckIndex() (SA1Registers.PL & IndexFlag)
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#define SA1CheckMemory() (SA1Registers.PL & MemoryFlag)
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#define SA1CheckOverflow() (SA1._Overflow)
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#define SA1CheckNegative() (SA1._Negative & 0x80)
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#define SA1CheckEmulation() (SA1Registers.P.W & Emulation)
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#define SA1SetFlags(f) (SA1Registers.P.W |= (f))
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#define SA1ClearFlags(f) (SA1Registers.P.W &= ~(f))
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#define SA1CheckFlag(f) (SA1Registers.PL & (f))
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extern struct SSA1Registers SA1Registers;
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extern struct SSA1 SA1;
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extern uint8 SA1OpenBus;
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extern struct SOpcodes S9xSA1OpcodesM1X1[256];
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extern struct SOpcodes S9xSA1OpcodesM1X0[256];
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extern struct SOpcodes S9xSA1OpcodesM0X1[256];
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extern struct SOpcodes S9xSA1OpcodesM0X0[256];
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extern uint8 S9xOpLengthsM1X1[256];
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extern uint8 S9xOpLengthsM1X0[256];
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extern uint8 S9xOpLengthsM0X1[256];
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extern uint8 S9xOpLengthsM0X0[256];
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uint8 S9xSA1GetByte (uint32);
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void S9xSA1SetByte (uint8, uint32);
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uint16 S9xSA1GetWord (uint32, enum s9xwrap_t w = WRAP_NONE);
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void S9xSA1SetWord (uint16, uint32, enum s9xwrap_t w = WRAP_NONE, enum s9xwriteorder_t o = WRITE_01);
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void S9xSA1SetPCBase (uint32);
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uint8 S9xGetSA1 (uint32);
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void S9xSetSA1 (uint8, uint32);
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void S9xSA1Init (void);
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void S9xSA1MainLoop (void);
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void S9xSA1PostLoadState (void);
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static inline void S9xSA1UnpackStatus (void)
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{
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SA1._Zero = (SA1Registers.PL & Zero) == 0;
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SA1._Negative = (SA1Registers.PL & Negative);
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SA1._Carry = (SA1Registers.PL & Carry);
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SA1._Overflow = (SA1Registers.PL & Overflow) >> 6;
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}
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static inline void S9xSA1PackStatus (void)
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{
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SA1Registers.PL &= ~(Zero | Negative | Carry | Overflow);
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SA1Registers.PL |= SA1._Carry | ((SA1._Zero == 0) << 1) | (SA1._Negative & 0x80) | (SA1._Overflow << 6);
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}
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static inline void S9xSA1FixCycles (void)
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{
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if (SA1CheckEmulation())
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{
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SA1.S9xOpcodes = S9xSA1OpcodesM1X1;
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SA1.S9xOpLengths = S9xOpLengthsM1X1;
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}
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else
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if (SA1CheckMemory())
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{
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if (SA1CheckIndex())
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{
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SA1.S9xOpcodes = S9xSA1OpcodesM1X1;
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SA1.S9xOpLengths = S9xOpLengthsM1X1;
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}
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else
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{
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SA1.S9xOpcodes = S9xSA1OpcodesM1X0;
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SA1.S9xOpLengths = S9xOpLengthsM1X0;
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}
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}
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else
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{
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if (SA1CheckIndex())
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{
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SA1.S9xOpcodes = S9xSA1OpcodesM0X1;
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SA1.S9xOpLengths = S9xOpLengthsM0X1;
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}
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else
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{
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SA1.S9xOpcodes = S9xSA1OpcodesM0X0;
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SA1.S9xOpLengths = S9xOpLengthsM0X0;
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}
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}
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}
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#endif
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