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Diffstat (limited to 'src/sa1.h')
| -rw-r--r-- | src/sa1.h | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/src/sa1.h b/src/sa1.h new file mode 100644 index 0000000..3a297f5 --- /dev/null +++ b/src/sa1.h @@ -0,0 +1,189 @@ +/*
+ * 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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