some optimizations

[picodrive.git] / cpu / Cyclone / Cyclone.h

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// Cyclone 68000 Emulator - Header File\r
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// Most code (c) Copyright 2004 Dave, All rights reserved.\r
// Some coding/bugfixing was done by notaz\r
// Cyclone 68000 is free for non-commercial use.\r
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// For commercial use, separate licencing terms must be obtained.\r
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#ifdef __cplusplus\r
extern "C" {\r
#endif\r
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extern int CycloneVer; // Version number of library\r
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struct Cyclone\r
{\r
  unsigned int d[8];   // [r7,#0x00]\r
  unsigned int a[8];   // [r7,#0x20]\r
  unsigned int pc;     // [r7,#0x40] Memory Base+PC\r
  unsigned char srh;   // [r7,#0x44] Status Register high (T_S__III)\r
  unsigned char xc;    // [r7,#0x45] Extend flag (____??X?)\r
  unsigned char flags; // [r7,#0x46] Flags (ARM order: ____NZCV) [68k order is XNZVC]\r
  unsigned char irq;   // [r7,#0x47] IRQ level\r
  unsigned int osp;    // [r7,#0x48] Other Stack Pointer (USP/SSP)\r
  unsigned int vector; // [r7,#0x4c] IRQ vector (temporary)\r
  unsigned int prev_pc;// [r7,#0x50] set to start address of currently executed opcode + 2 (if enabled in config.h)\r
  unsigned int unused; // [r7,#0x54] Unused\r
  int stopped;         // [r7,#0x58] 1 == processor is in stopped state\r
  int cycles;          // [r7,#0x5c]\r
  int membase;         // [r7,#0x60] Memory Base (ARM address minus 68000 address)\r
  unsigned int   (*checkpc)(unsigned int pc); // [r7,#0x64] - Called to recalc Memory Base+pc\r
  unsigned char  (*read8  )(unsigned int a);  // [r7,#0x68]\r
  unsigned short (*read16 )(unsigned int a);  // [r7,#0x6c]\r
  unsigned int   (*read32 )(unsigned int a);  // [r7,#0x70]\r
  void (*write8 )(unsigned int a,unsigned char  d); // [r7,#0x74]\r
  void (*write16)(unsigned int a,unsigned short d); // [r7,#0x78]\r
  void (*write32)(unsigned int a,unsigned int   d); // [r7,#0x7c]\r
  unsigned char  (*fetch8 )(unsigned int a);  // [r7,#0x80]\r
  unsigned short (*fetch16)(unsigned int a);  // [r7,#0x84]\r
  unsigned int   (*fetch32)(unsigned int a);  // [r7,#0x88]\r
  void (*IrqCallback)(int int_level);         // [r7,#0x8c] - optional irq callback function, see config.h\r
  void (*ResetCallback)();                    // [r7,#0x90] - if enabled in config.h, calls this whenever RESET opcode is encountered.\r
  int  (*UnrecognizedCallback)();             // [r7,#0x94] - if enabled in config.h, calls this whenever unrecognized opcode is encountered.\r
};\r
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// used only if Cyclone was compiled with compressed jumptable, see config.h\r
void CycloneInit();\r
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// run cyclone. Cycles should be specified in context (pcy->cycles)\r
void CycloneRun(struct Cyclone *pcy);\r
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// utility functions to get and set SR\r
void CycloneSetSr(struct Cyclone *pcy, unsigned int sr); // auto-swaps a7<->osp if detects supervisor change\r
unsigned int CycloneGetSr(struct Cyclone *pcy);\r
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// genesis: if 1, switch to normal TAS handlers\r
void CycloneSetRealTAS(int use_real);\r
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#ifdef __cplusplus\r
} // End of extern "C"\r
#endif\r