PicoDrive hacks

[picodrive.git] / Pico / Sek.c

// This is part of Pico Library\r
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// (c) Copyright 2004 Dave, All rights reserved.\r
// (c) Copyright 2006 notaz, All rights reserved.\r
// Free for non-commercial use.\r
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// For commercial use, separate licencing terms must be obtained.\r
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#include "PicoInt.h"\r
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int SekCycleCnt=0; // cycles done in this frame\r
int SekCycleAim=0; // cycle aim\r
unsigned int SekCycleCntT=0;\r
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#ifdef EMU_C68K\r
// ---------------------- Cyclone 68000 ----------------------\r
struct Cyclone PicoCpu;\r
#endif\r
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#ifdef EMU_M68K\r
// ---------------------- MUSASHI 68000 ----------------------\r
m68ki_cpu_core PicoM68kCPU; // MD's CPU\r
#endif\r
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#ifdef EMU_A68K\r
// ---------------------- A68K ----------------------\r
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void __cdecl M68000_RESET();\r
int m68k_ICount=0;\r
unsigned int mem_amask=0xffffff; // 24-bit bus\r
unsigned int mame_debug=0,cur_mrhard=0,m68k_illegal_opcode=0,illegal_op=0,illegal_pc=0,opcode_entry=0; // filler\r
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static int IrqCallback(int i) { i; return -1; }\r
static int DoReset() { return 0; }\r
static int (*ResetCallback)()=DoReset;\r
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#pragma warning (disable:4152)\r
#endif\r
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#ifdef EMU_C68K\r
// interrupt acknowledgment\r
static void SekIntAck(int level)\r
{\r
  // try to emulate VDP's reaction to 68000 int ack\r
  if     (level == 4) Pico.video.pending_ints  =  0;\r
  else if(level == 6) Pico.video.pending_ints &= ~0x20;\r
  PicoCpu.irq = 0;\r
}\r
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static void SekResetAck()\r
{\r
#if defined(__DEBUG_PRINT) || defined(WIN32)\r
  dprintf("Reset encountered @ %06x", SekPc);\r
#endif\r
}\r
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static int SekUnrecognizedOpcode()\r
{\r
  unsigned int pc, op;\r
  pc = SekPc;\r
  op = PicoCpu.read16(pc);\r
#if defined(__DEBUG_PRINT) || defined(WIN32)\r
  dprintf("Unrecognized Opcode %04x @ %06x", op, pc);\r
#endif\r
  // see if we are not executing trash\r
  if (pc < 0x200 || (pc > Pico.romsize+4 && (pc&0xe00000)!=0xe00000)) {\r
    PicoCpu.cycles = 0;\r
    PicoCpu.stopped = 1;\r
    return 1;\r
  }\r
#ifdef EMU_M68K // debugging cyclone\r
  {\r
    extern int have_illegal;\r
    have_illegal = 1;\r
  }\r
#endif\r
  //exit(1);\r
  return 0;\r
}\r
#endif\r
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#ifdef EMU_M68K\r
static int SekIntAckM68K(int level)\r
{\r
  if     (level == 4) { Pico.video.pending_ints  =  0;    dprintf("hack: [%i|%i]", Pico.m.scanline, SekCyclesDone()); }\r
  else if(level == 6) { Pico.video.pending_ints &= ~0x20; dprintf("vack: [%i|%i]", Pico.m.scanline, SekCyclesDone()); }\r
  CPU_INT_LEVEL = 0;\r
  return M68K_INT_ACK_AUTOVECTOR;\r
}\r
#endif\r
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int SekInit()\r
{\r
#ifdef EMU_C68K\r
  CycloneInit();\r
  memset(&PicoCpu,0,sizeof(PicoCpu));\r
  PicoCpu.IrqCallback=SekIntAck;\r
  PicoCpu.ResetCallback=SekResetAck;\r
  PicoCpu.UnrecognizedCallback=SekUnrecognizedOpcode;\r
#endif\r
#ifdef EMU_A68K\r
  memset(&M68000_regs,0,sizeof(M68000_regs));\r
  M68000_regs.IrqCallback=IrqCallback;\r
  M68000_regs.pResetCallback=ResetCallback;\r
  M68000_RESET(); // Init cpu emulator\r
#endif\r
#ifdef EMU_M68K\r
  {\r
    void *oldcontext = m68ki_cpu_p;\r
    m68k_set_context(&PicoM68kCPU);\r
    m68k_set_cpu_type(M68K_CPU_TYPE_68000);\r
    m68k_init();\r
    m68k_set_int_ack_callback(SekIntAckM68K);\r
    m68k_pulse_reset(); // Init cpu emulator\r
    m68k_set_context(oldcontext);\r
  }\r
#endif\r
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  return 0;\r
}\r
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// Reset the 68000:\r
int SekReset()\r
{\r
  if (Pico.rom==NULL) return 1;\r
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#ifdef EMU_C68K\r
  PicoCpu.stopped=0;\r
  PicoCpu.osp=0;\r
  PicoCpu.srh =0x27; // Supervisor mode\r
  PicoCpu.flags=4;   // Z set\r
  PicoCpu.irq=0;\r
  PicoCpu.a[7]=PicoCpu.read32(0); // Stack Pointer\r
  PicoCpu.membase=0;\r
  PicoCpu.pc=PicoCpu.checkpc(PicoCpu.read32(4)); // Program Counter\r
#endif\r
#ifdef EMU_A68K\r
  // Reset CPU: fetch SP and PC\r
  M68000_regs.srh=0x27; // Supervisor mode\r
  M68000_regs.a[7]=PicoRead32(0);\r
  M68000_regs.pc  =PicoRead32(4);\r
  PicoInitPc(M68000_regs.pc);\r
#endif\r
#ifdef EMU_M68K\r
  m68k_set_context(&PicoM68kCPU); // if we ever reset m68k, we always need it's context to be set\r
  m68ki_cpu.sp[0]=0;\r
  m68k_set_irq(0);\r
  m68k_pulse_reset();\r
#endif\r
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  return 0;\r
}\r
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int SekInterrupt(int irq)\r
{\r
#ifdef EMU_C68K\r
  PicoCpu.irq=irq;\r
#endif\r
#ifdef EMU_A68K\r
  M68000_regs.irq=irq; // raise irq (gets lowered after taken)\r
#endif\r
#ifdef EMU_M68K\r
  {\r
    void *oldcontext = m68ki_cpu_p;\r
    m68k_set_context(&PicoM68kCPU);\r
    m68k_set_irq(irq); // raise irq (gets lowered after taken or must be done in ack)\r
    m68k_set_context(oldcontext);\r
  }\r
#endif\r
  return 0;\r
}\r
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//int SekPc() { return PicoCpu.pc-PicoCpu.membase; }\r
//int SekPc() { return M68000_regs.pc; }\r
//int SekPc() { return m68k_get_reg(NULL, M68K_REG_PC); }\r
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void SekState(unsigned char *data)\r
{\r
#ifdef EMU_C68K\r
  memcpy(data,PicoCpu.d,0x44);\r
#elif defined(EMU_A68K)\r
  memcpy(data,      M68000_regs.d, 0x40);\r
  memcpy(data+0x40,&M68000_regs.pc,0x04);\r
#elif defined(EMU_M68K)\r
  memcpy(data,      PicoM68kCPU.dar,0x40);\r
  memcpy(data+0x40,&PicoM68kCPU.pc, 0x04);\r
#endif\r
}\r
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void SekSetRealTAS(int use_real)\r
{\r
#ifdef EMU_C68K\r
  CycloneSetRealTAS(use_real);\r
#endif\r
}\r
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