snes9x/sa1.h

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