mirror of
https://github.com/libretro/snes9x.git
synced 2024-11-23 16:29:41 +00:00
149 lines
3.6 KiB
C
149 lines
3.6 KiB
C
/*****************************************************************************\
|
|
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.
|
|
\*****************************************************************************/
|
|
|
|
#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;
|
|
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;
|
|
int32 arithmetic_op;
|
|
uint16 op1;
|
|
uint16 op2;
|
|
uint64 sum;
|
|
bool8 overflow;
|
|
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
|