[picodrive.git] / Pico / cd / Memory.c

// This is part of Pico Library\r
\r
// (c) Copyright 2004 Dave, All rights reserved.\r
// (c) Copyright 2006 notaz, All rights reserved.\r
// Free for non-commercial use.\r
\r
// For commercial use, separate licencing terms must be obtained.\r
\r
// A68K no longer supported here\r
\r
//#define __debug_io\r
\r
#include "../PicoInt.h"\r
\r
#include "../sound/sound.h"\r
#include "../sound/ym2612.h"\r
#include "../sound/sn76496.h"\r
\r
typedef unsigned char  u8;\r
typedef unsigned short u16;\r
typedef unsigned int   u32;\r
\r
//#define __debug_io\r
//#define __debug_io2\r
\r
// -----------------------------------------------------------------\r
\r
// extern m68ki_cpu_core m68ki_cpu;\r
\r
extern int counter75hz;\r
\r
\r
static u32 m68k_reg_read16(u32 a, int realsize)\r
{\r
  u32 d=0;\r
  a &= 0x3e;\r
  // dprintf("m68k_regs r%2i: [%02x] @%06x", realsize&~1, a+(realsize&1), SekPc);\r
\r
  switch (a) {\r
    case 0:\r
      d = ((Pico_mcd->s68k_regs[0x33]<<13)&0x8000) | Pico_mcd->m68k_regs[1]; // here IFL2 is always 0, just like in Gens\r
      goto end;\r
    case 2:\r
      d = (Pico_mcd->s68k_regs[a]<<8) | (Pico_mcd->s68k_regs[a+1]&0xc7);\r
      goto end;\r
    case 8:\r
      dprintf("m68k host data read");\r
      d = Read_CDC_Host(0);\r
      goto end;\r
    case 0xC:\r
      dprintf("m68k stopwatch read");\r
      break;\r
  }\r
\r
  if (a < 0xE) {\r
    d = (Pico_mcd->m68k_regs[a]<<8) | Pico_mcd->m68k_regs[a+1];\r
    goto end;\r
  }\r
\r
  if (a < 0x30) {\r
    // comm flag/cmd/status (0xE-0x2F)\r
    d = (Pico_mcd->s68k_regs[a]<<8) | Pico_mcd->s68k_regs[a+1];\r
    goto end;\r
  }\r
\r
  dprintf("m68k_regs invalid read @ %02x", a);\r
\r
end:\r
\r
  // dprintf("ret = %04x", d);\r
  return d;\r
}\r
\r
static void m68k_reg_write8(u32 a, u32 d, int realsize)\r
{\r
  a &= 0x3f;\r
  // dprintf("m68k_regs w%2i: [%02x] %02x @%06x", realsize, a, d, SekPc);\r
\r
  switch (a) {\r
    case 0:\r
      d &= 1;\r
      if ((d&1) && (Pico_mcd->s68k_regs[0x33]&(1<<2))) { dprintf("m68k: s68k irq 2"); SekInterruptS68k(2); }\r
      break;\r
    case 1:\r
      d &= 3;\r
      if (!(d&1)) PicoMCD |= 2; // reset pending, needed to be sure we fetch the right vectors on reset\r
      if ( (Pico_mcd->m68k_regs[1]&1) != (d&1)) dprintf("m68k: s68k reset %i", !(d&1));\r
      if ( (Pico_mcd->m68k_regs[1]&2) != (d&2)) dprintf("m68k: s68k brq %i", (d&2)>>1);\r
      if (/*!(Pico_mcd->m68k_regs[1]&1) &&*/ (PicoMCD&2) && (d&3)==1) {\r
        SekResetS68k(); // S68k comes out of RESET or BRQ state\r
	PicoMCD&=~2;\r
	dprintf("m68k: resetting s68k, cycles=%i", SekCyclesLeft);\r
      }\r
      break;\r
    case 2:\r
      Pico_mcd->s68k_regs[2] = d; // really use s68k side register\r
      return;\r
    case 3:\r
      d &= 0xc2;\r
      if ((Pico_mcd->s68k_regs[3]>>6) != ((d>>6)&3))\r
        dprintf("m68k: prg bank: %i -> %i", (Pico_mcd->s68k_regs[a]>>6), ((d>>6)&3));\r
      //if ((Pico_mcd->s68k_regs[3]&4) != (d&4)) dprintf("m68k: ram mode %i mbit", (d&4) ? 1 : 2);\r
      //if ((Pico_mcd->s68k_regs[3]&2) != (d&2)) dprintf("m68k: %s", (d&4) ? ((d&2) ? "word swap req" : "noop?") :\r
      //                                             ((d&2) ? "word ram to s68k" : "word ram to m68k"));\r
      d |= Pico_mcd->s68k_regs[3]&0x1d;\r
      if (!(d & 4) && (d & 2)) d &= ~1; // return word RAM to s68k in 2M mode\r
      Pico_mcd->s68k_regs[3] = d; // really use s68k side register\r
      return;\r
    case 0xe:\r
      //dprintf("m68k: comm flag: %02x", d);\r
\r
      //dprintf("s68k @ %06x", SekPcS68k);\r
\r
      Pico_mcd->s68k_regs[0xe] = d;\r
      break;\r
  }\r
\r
  if (a < 0x10) {\r
    Pico_mcd->m68k_regs[a] = (u8) d;\r
    return;\r
  }\r
\r
  if ((a&0xf0) == 0x10) {\r
      Pico_mcd->s68k_regs[a] = d;\r
      return;\r
  }\r
\r
  if (a >= 0x20 || (a >= 0xa && a <= 0xd) || a == 0x0f)\r
    dprintf("m68k: invalid write?");\r
}\r
\r
\r
\r
static u32 s68k_reg_read16(u32 a, int realsize)\r
{\r
  u32 d=0;\r
  a &= 0x1fe;\r
\r
  // dprintf("s68k_regs r%2i: [%02x] @ %06x", realsize&~1, a+(realsize&1), SekPcS68k);\r
\r
  switch (a) {\r
    case 0:\r
      d = 1; goto end; // ver = 0, not in reset state\r
    case 2:\r
      d = (Pico_mcd->s68k_regs[a]<<8) | (Pico_mcd->s68k_regs[a+1]&0x1f);\r
      goto end;\r
    case 6:\r
      d = CDC_Read_Reg();\r
      goto end;\r
    case 8:\r
      dprintf("s68k host data read");\r
      d = Read_CDC_Host(1);\r
      goto end;\r
    case 0xC:\r
      dprintf("s68k stopwatch read");\r
      break;\r
    case 0x34: // fader\r
      d = 0; // no busy bit\r
      goto end;\r
  }\r
\r
  d = (Pico_mcd->s68k_regs[a]<<8) | Pico_mcd->s68k_regs[a+1];\r
\r
end:\r
\r
  // dprintf("ret = %04x", d);\r
\r
  return d;\r
}\r
\r
static void s68k_reg_write8(u32 a, u32 d, int realsize)\r
{\r
  a &= 0x1ff;\r
  //dprintf("s68k_regs w%2i: [%02x] %02x @ %06x", realsize, a, d, SekPcS68k);\r
\r
  // TODO: review against Gens\r
  switch (a) {\r
    case 2:\r
      return; // only m68k can change WP\r
    case 3:\r
      d &= 0x1d;\r
      if (d&4) {\r
        d |= Pico_mcd->s68k_regs[3]&0xc2;\r
        if ((d ^ Pico_mcd->s68k_regs[3]) & 5) d &= ~2; // in case of mode or bank change we clear DMNA (m68k req) bit\r
      } else {\r
        d |= Pico_mcd->s68k_regs[3]&0xc3;\r
        if (d&1) d &= ~2; // return word RAM to m68k in 2M mode\r
      }\r
      break;\r
    case 4:\r
      dprintf("s68k CDC dest: %x", d&7);\r
      Pico_mcd->s68k_regs[4] = (Pico_mcd->s68k_regs[4]&0xC0) | (d&7); // CDC mode\r
      return;\r
    case 5:\r
      dprintf("s68k CDC reg addr: %x", d&0xf);\r
      break;\r
    case 7:\r
      CDC_Write_Reg(d);\r
      return;\r
    case 0xa:\r
      dprintf("s68k set CDC dma addr");\r
      break;\r
    case 0x33: // IRQ mask\r
      dprintf("s68k irq mask: %02x", d);\r
      if ((d&(1<<4)) && (Pico_mcd->s68k_regs[0x37]&4) && !(Pico_mcd->s68k_regs[0x33]&(1<<4))) {\r
        CDD_Export_Status();\r
	// counter75hz = 0; // ???\r
      }\r
      break;\r
    case 0x34: // fader\r
      Pico_mcd->s68k_regs[a] = (u8) d & 0x7f;\r
      return;\r
    case 0x36:\r
      return; // d/m bit is unsetable\r
    case 0x37: {\r
      u32 d_old = Pico_mcd->s68k_regs[0x37];\r
      Pico_mcd->s68k_regs[0x37] = d&7;\r
      if ((d&4) && !(d_old&4)) {\r
        CDD_Export_Status();\r
	// counter75hz = 0; // ???\r
      }\r
      return;\r
    }\r
    case 0x4b:\r
      Pico_mcd->s68k_regs[a] = (u8) d;\r
      CDD_Import_Command();\r
      return;\r
  }\r
\r
  if ((a&0x1f0) == 0x10 || a == 0x0e || (a >= 0x38 && a < 0x42))\r
  {\r
    dprintf("m68k: invalid write @ %02x?", a);\r
    return;\r
  }\r
\r
  Pico_mcd->s68k_regs[a] = (u8) d;\r
}\r
\r
\r
\r
\r
\r
static int PadRead(int i)\r
{\r
  int pad=0,value=0,TH;\r
  pad=~PicoPad[i]; // Get inverse of pad MXYZ SACB RLDU\r
  TH=Pico.ioports[i+1]&0x40;\r
\r
  if(PicoOpt & 0x20) { // 6 button gamepad enabled\r
    int phase = Pico.m.padTHPhase[i];\r
\r
    if(phase == 2 && !TH) {\r
      value=(pad&0xc0)>>2;              // ?0SA 0000\r
      goto end;\r
    } else if(phase == 3 && TH) {\r
      value=(pad&0x30)|((pad>>8)&0xf);  // ?1CB MXYZ\r
      goto end;\r
    } else if(phase == 3 && !TH) {\r
      value=((pad&0xc0)>>2)|0x0f;       // ?0SA 1111\r
      goto end;\r
    }\r
  }\r
\r
  if(TH) value=(pad&0x3f);              // ?1CB RLDU\r
  else   value=((pad&0xc0)>>2)|(pad&3); // ?0SA 00DU\r
\r
  end:\r
\r
  // orr the bits, which are set as output\r
  value |= Pico.ioports[i+1]&Pico.ioports[i+4];\r
\r
  return value; // will mirror later\r
}\r
\r
static u8 z80Read8(u32 a)\r
{\r
  if(Pico.m.z80Run&1) return 0;\r
\r
  a&=0x1fff;\r
\r
  if(!(PicoOpt&4)) {\r
    // Z80 disabled, do some faking\r
    static u8 zerosent = 0;\r
    if(a == Pico.m.z80_lastaddr) { // probably polling something\r
      u8 d = Pico.m.z80_fakeval;\r
      if((d & 0xf) == 0xf && !zerosent) {\r
        d = 0; zerosent = 1;\r
      } else {\r
        Pico.m.z80_fakeval++;\r
        zerosent = 0;\r
      }\r
      return d;\r
    } else {\r
      Pico.m.z80_fakeval = 0;\r
    }\r
  }\r
\r
  Pico.m.z80_lastaddr = (u16) a;\r
  return Pico.zram[a];\r
}\r
\r
\r
// for nonstandard reads\r
static u32 UnusualRead16(u32 a, int realsize)\r
{\r
  u32 d=0;\r
\r
  dprintf("unusual r%i: %06x @%06x", realsize&~1, (a&0xfffffe)+(realsize&1), SekPc);\r
\r
\r
  dprintf("ret = %04x", d);\r
  return d;\r
}\r
\r
static u32 OtherRead16(u32 a, int realsize)\r
{\r
  u32 d=0;\r
\r
  if ((a&0xff0000)==0xa00000) {\r
    if ((a&0x4000)==0x0000) { d=z80Read8(a); d|=d<<8; goto end; } // Z80 ram (not byteswaped)\r
    if ((a&0x6000)==0x4000) { if(PicoOpt&1) d=YM2612Read(); else d=Pico.m.rotate++&3; goto end; } // 0x4000-0x5fff, Fudge if disabled\r
	d=0xffff; goto end;\r
  }\r
  if ((a&0xffffe0)==0xa10000) { // I/O ports\r
    a=(a>>1)&0xf;\r
    switch(a) {\r
      case 0:  d=Pico.m.hardware; break; // Hardware value (Version register)\r
      case 1:  d=PadRead(0); d|=Pico.ioports[1]&0x80; break;\r
      case 2:  d=PadRead(1); d|=Pico.ioports[2]&0x80; break;\r
      default: d=Pico.ioports[a]; break; // IO ports can be used as RAM\r
    }\r
    d|=d<<8;\r
    goto end;\r
  }\r
  // |=0x80 for Shadow of the Beast & Super Offroad; rotate fakes next fetched instruction for Time Killers\r
  if (a==0xa11100) { d=((Pico.m.z80Run&1)<<8)|0x8000|Pico.m.rotate++; goto end; }\r
\r
  if ((a&0xe700e0)==0xc00000) { d=PicoVideoRead(a); goto end; }\r
\r
  if ((a&0xffffc0)==0xa12000) {\r
    d=m68k_reg_read16(a, realsize);\r
    goto end;\r
  }\r
\r
  d = UnusualRead16(a, realsize);\r
\r
end:\r
  return d;\r
}\r
\r
//extern UINT32 mz80GetRegisterValue(void *, UINT32);\r
\r
static void OtherWrite8(u32 a,u32 d,int realsize)\r
{\r
  if ((a&0xe700f9)==0xc00011||(a&0xff7ff9)==0xa07f11) { if(PicoOpt&2) SN76496Write(d); return; } // PSG Sound\r
  if ((a&0xff4000)==0xa00000)  { if(!(Pico.m.z80Run&1)) Pico.zram[a&0x1fff]=(u8)d; return; } // Z80 ram\r
  if ((a&0xff6000)==0xa04000)  { if(PicoOpt&1) emustatus|=YM2612Write(a&3, d); return; } // FM Sound\r
  if ((a&0xffffe0)==0xa10000)  { // I/O ports\r
    a=(a>>1)&0xf;\r
    // 6 button gamepad: if TH went from 0 to 1, gamepad changes state\r
    if(PicoOpt&0x20) {\r
      if(a==1) {\r
        Pico.m.padDelay[0] = 0;\r
        if(!(Pico.ioports[1]&0x40) && (d&0x40)) Pico.m.padTHPhase[0]++;\r
      }\r
      else if(a==2) {\r
        Pico.m.padDelay[1] = 0;\r
        if(!(Pico.ioports[2]&0x40) && (d&0x40)) Pico.m.padTHPhase[1]++;\r
      }\r
    }\r
    Pico.ioports[a]=(u8)d; // IO ports can be used as RAM\r
    return;\r
  }\r
  if (a==0xa11100) {\r
    extern int z80startCycle, z80stopCycle;\r
    //int lineCycles=(488-SekCyclesLeft)&0x1ff;\r
    d&=1; d^=1;\r
	if(!d) {\r
 	  // hack: detect a nasty situation where Z80 was enabled and disabled in the same 68k timeslice (Golden Axe III)\r
      if((PicoOpt&4) && Pico.m.z80Run==1) z80_run(20);\r
	  z80stopCycle = SekCyclesDone();\r
	  //z80ExtraCycles += (lineCycles>>1)-(lineCycles>>5); // only meaningful in PicoFrameHints()\r
	} else {\r
	  z80startCycle = SekCyclesDone();\r
	  //if(Pico.m.scanline != -1)\r
	  //z80ExtraCycles -= (lineCycles>>1)-(lineCycles>>5)+16;\r
	}\r
    //dprintf("set_zrun: %i [%i|%i] zPC=%04x @%06x", d, Pico.m.scanline, SekCyclesDone(), mz80GetRegisterValue(NULL, 0), SekPc);\r
	Pico.m.z80Run=(u8)d; return;\r
  }\r
  if (a==0xa11200) { if(!(d&1)) z80_reset(); return; }\r
\r
  if ((a&0xff7f00)==0xa06000) // Z80 BANK register\r
  {\r
    Pico.m.z80_bank68k>>=1;\r
    Pico.m.z80_bank68k|=(d&1)<<8;\r
    Pico.m.z80_bank68k&=0x1ff; // 9 bits and filled in the new top one\r
    return;\r
  }\r
\r
  if ((a&0xe700e0)==0xc00000) { PicoVideoWrite(a,(u16)(d|(d<<8))); return; } // Byte access gets mirrored\r
\r
  if ((a&0xffffc0)==0xa12000) { m68k_reg_write8(a, d, realsize); return; }\r
\r
  dprintf("strange w%i: %06x, %08x @%06x", realsize, a&0xffffff, d, SekPc);\r
}\r
\r
static void OtherWrite16(u32 a,u32 d)\r
{\r
  if ((a&0xe700e0)==0xc00000) { PicoVideoWrite(a,(u16)d); return; }\r
  if ((a&0xff4000)==0xa00000) { if(!(Pico.m.z80Run&1)) Pico.zram[a&0x1fff]=(u8)(d>>8); return; } // Z80 ram (MSB only)\r
\r
  if ((a&0xffffe0)==0xa10000) { // I/O ports\r
    a=(a>>1)&0xf;\r
    // 6 button gamepad: if TH went from 0 to 1, gamepad changes state\r
    if(PicoOpt&0x20) {\r
      if(a==1) {\r
        Pico.m.padDelay[0] = 0;\r
        if(!(Pico.ioports[1]&0x40) && (d&0x40)) Pico.m.padTHPhase[0]++;\r
      }\r
      else if(a==2) {\r
        Pico.m.padDelay[1] = 0;\r
        if(!(Pico.ioports[2]&0x40) && (d&0x40)) Pico.m.padTHPhase[1]++;\r
      }\r
    }\r
    Pico.ioports[a]=(u8)d; // IO ports can be used as RAM\r
    return;\r
  }\r
  if (a==0xa11100) { OtherWrite8(a, d>>8, 16); return; }\r
  if (a==0xa11200) { if(!(d&0x100)) z80_reset(); return; }\r
\r
  OtherWrite8(a,  d>>8, 16);\r
  OtherWrite8(a+1,d&0xff, 16);\r
}\r
\r
// -----------------------------------------------------------------\r
//                     Read Rom and read Ram\r
\r
u8 PicoReadM68k8(u32 a)\r
{\r
  u32 d=0;\r
\r
  if ((a&0xe00000)==0xe00000) { d = *(u8 *)(Pico.ram+((a^1)&0xffff)); goto end; } // Ram\r
\r
  a&=0xffffff;\r
\r
  if (a < 0x20000) { d = *(u8 *)(Pico_mcd->bios+(a^1)); goto end; } // bios\r
\r
  // prg RAM\r
  if ((a&0xfe0000)==0x020000) {\r
    u8 *prg_bank = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6];\r
    d = *(prg_bank+((a^1)&0x1ffff));\r
    goto end;\r
  }\r
\r
  // word RAM\r
  if ((a&0xfc0000)==0x200000) {\r
    dprintf("m68k_wram r8: [%06x] @%06x", a, SekPc);\r
    if (Pico_mcd->s68k_regs[3]&4) { // 1M mode?\r
      // TODO\r
    } else {\r
      // allow access in any mode, like Gens does\r
      d = Pico_mcd->word_ram[(a^1)&0x3ffff];\r
    }\r
    dprintf("ret = %02x", (u8)d);\r
    goto end;\r
  }\r
\r
  if ((a&0xff4000)==0xa00000) { d=z80Read8(a); goto end; } // Z80 Ram\r
\r
  if ((a&0xffffc0)==0xa12000)\r
    dprintf("m68k_regs r8: [%02x] @%06x", a&0x3f, SekPc);\r
\r
  d=OtherRead16(a&~1, 8|(a&1)); if ((a&1)==0) d>>=8;\r
\r
  if ((a&0xffffc0)==0xa12000)\r
    dprintf("ret = %02x", (u8)d);\r
\r
  end:\r
\r
#ifdef __debug_io\r
  dprintf("r8 : %06x,   %02x @%06x", a&0xffffff, (u8)d, SekPc);\r
#endif\r
  return (u8)d;\r
}\r
\r
u16 PicoReadM68k16(u32 a)\r
{\r
  u16 d=0;\r
\r
  if ((a&0xe00000)==0xe00000) { d=*(u16 *)(Pico.ram+(a&0xfffe)); goto end; } // Ram\r
\r
  a&=0xfffffe;\r
\r
  if (a < 0x20000) { d = *(u16 *)(Pico_mcd->bios+a); goto end; } // bios\r
\r
  // prg RAM\r
  if ((a&0xfe0000)==0x020000) {\r
    u8 *prg_bank = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6];\r
    d = *(u16 *)(prg_bank+(a&0x1fffe));\r
    goto end;\r
  }\r
\r
  // word RAM\r
  if ((a&0xfc0000)==0x200000) {\r
    dprintf("m68k_wram r16: [%06x] @%06x", a, SekPc);\r
    if (Pico_mcd->s68k_regs[3]&4) { // 1M mode?\r
      // TODO\r
    } else {\r
      // allow access in any mode, like Gens does\r
      d = *(u16 *)(Pico_mcd->word_ram+(a&0x3fffe));\r
    }\r
    dprintf("ret = %04x", d);\r
    goto end;\r
  }\r
\r
  if ((a&0xffffc0)==0xa12000)\r
    dprintf("m68k_regs r16: [%02x] @%06x", a&0x3f, SekPc);\r
\r
  d = (u16)OtherRead16(a, 16);\r
\r
  if ((a&0xffffc0)==0xa12000)\r
    dprintf("ret = %04x", d);\r
\r
  end:\r
\r
#ifdef __debug_io\r
  dprintf("r16: %06x, %04x  @%06x", a&0xffffff, d, SekPc);\r
#endif\r
  return d;\r
}\r
\r
u32 PicoReadM68k32(u32 a)\r
{\r
  u32 d=0;\r
\r
  if ((a&0xe00000)==0xe00000) { u16 *pm=(u16 *)(Pico.ram+(a&0xfffe)); d = (pm[0]<<16)|pm[1]; goto end; } // Ram\r
\r
  a&=0xfffffe;\r
\r
  if (a < 0x20000) { u16 *pm=(u16 *)(Pico_mcd->bios+a); d = (pm[0]<<16)|pm[1]; goto end; } // bios\r
\r
  // prg RAM\r
  if ((a&0xfe0000)==0x020000) {\r
    u8 *prg_bank = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6];\r
    u16 *pm=(u16 *)(prg_bank+(a&0x1fffe));\r
    d = (pm[0]<<16)|pm[1];\r
    goto end;\r
  }\r
\r
  // word RAM\r
  if ((a&0xfc0000)==0x200000) {\r
    dprintf("m68k_wram r32: [%06x] @%06x", a, SekPc);\r
    if (Pico_mcd->s68k_regs[3]&4) { // 1M mode?\r
      // TODO\r
    } else {\r
      // allow access in any mode, like Gens does\r
      u16 *pm=(u16 *)(Pico_mcd->word_ram+(a&0x3fffe)); d = (pm[0]<<16)|pm[1];\r
    }\r
    dprintf("ret = %08x", d);\r
    goto end;\r
  }\r
\r
  if ((a&0xffffc0)==0xa12000)\r
    dprintf("m68k_regs r32: [%02x] @%06x", a&0x3f, SekPc);\r
\r
  d = (OtherRead16(a, 32)<<16)|OtherRead16(a+2, 32);\r
\r
  if ((a&0xffffc0)==0xa12000)\r
    dprintf("ret = %08x", d);\r
\r
  end:\r
#ifdef __debug_io\r
  dprintf("r32: %06x, %08x @%06x", a&0xffffff, d, SekPc);\r
#endif\r
  return d;\r
}\r
\r
// -----------------------------------------------------------------\r
//                            Write Ram\r
\r
void PicoWriteM68k8(u32 a,u8 d)\r
{\r
#ifdef __debug_io\r
  dprintf("w8 : %06x,   %02x @%06x", a&0xffffff, d, SekPc);\r
#endif\r
  //if ((a&0xe0ffff)==0xe0a9ba+0x69c)\r
  //  dprintf("w8 : %06x,   %02x @%06x", a&0xffffff, d, SekPc);\r
\r
\r
  if ((a&0xe00000)==0xe00000) { u8 *pm=(u8 *)(Pico.ram+((a^1)&0xffff)); pm[0]=d; return; } // Ram\r
\r
  a&=0xffffff;\r
\r
  // prg RAM\r
  if ((a&0xfe0000)==0x020000) {\r
    u8 *prg_bank = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6];\r
    u8 *pm=(u8 *)(prg_bank+((a^1)&0x1ffff));\r
    *pm=d;\r
    return;\r
  }\r
\r
  // word RAM\r
  if ((a&0xfc0000)==0x200000) {\r
    dprintf("m68k_wram w8: [%06x] %02x @%06x", a, d, SekPc);\r
    if (Pico_mcd->s68k_regs[3]&4) { // 1M mode?\r
      // TODO\r
    } else {\r
      // allow access in any mode, like Gens does\r
      u8 *pm=(u8 *)(Pico_mcd->word_ram+((a^1)&0x3ffff));\r
      *pm=d;\r
    }\r
    return;\r
  }\r
\r
  if ((a&0xffffc0)==0xa12000)\r
    dprintf("m68k_regs w8: [%02x] %02x @%06x", a&0x3f, d, SekPc);\r
\r
  OtherWrite8(a,d,8);\r
}\r
\r
void PicoWriteM68k16(u32 a,u16 d)\r
{\r
#ifdef __debug_io\r
  dprintf("w16: %06x, %04x", a&0xffffff, d);\r
#endif\r
  //if ((a&0xe0ffff)==0xe0AF0E+0x69c||(a&0xe0ffff)==0xe0A9A8+0x69c||(a&0xe0ffff)==0xe0A9AA+0x69c||(a&0xe0ffff)==0xe0A9AC+0x69c)\r
  //  dprintf("w16: %06x, %04x  @%06x", a&0xffffff, d, SekPc);\r
\r
  if ((a&0xe00000)==0xe00000) { *(u16 *)(Pico.ram+(a&0xfffe))=d; return; } // Ram\r
\r
  a&=0xfffffe;\r
\r
  // prg RAM\r
  if ((a&0xfe0000)==0x020000) {\r
    u8 *prg_bank = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6];\r
    *(u16 *)(prg_bank+(a&0x1fffe))=d;\r
    return;\r
  }\r
\r
  // word RAM\r
  if ((a&0xfc0000)==0x200000) {\r
    dprintf("m68k_wram w16: [%06x] %04x @%06x", a, d, SekPc);\r
    if (Pico_mcd->s68k_regs[3]&4) { // 1M mode?\r
      // TODO\r
    } else {\r
      // allow access in any mode, like Gens does\r
      *(u16 *)(Pico_mcd->word_ram+(a&0x3fffe))=d;\r
    }\r
    return;\r
  }\r
\r
  if ((a&0xffffc0)==0xa12000)\r
    dprintf("m68k_regs w16: [%02x] %04x @%06x", a&0x3f, d, SekPc);\r
\r
  OtherWrite16(a,d);\r
}\r
\r
void PicoWriteM68k32(u32 a,u32 d)\r
{\r
#ifdef __debug_io\r
  dprintf("w32: %06x, %08x", a&0xffffff, d);\r
#endif\r
\r
  if ((a&0xe00000)==0xe00000)\r
  {\r
    // Ram:\r
    u16 *pm=(u16 *)(Pico.ram+(a&0xfffe));\r
    pm[0]=(u16)(d>>16); pm[1]=(u16)d;\r
    return;\r
  }\r
\r
  a&=0xfffffe;\r
\r
  // prg RAM\r
  if ((a&0xfe0000)==0x020000) {\r
    u8 *prg_bank = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6];\r
    u16 *pm=(u16 *)(prg_bank+(a&0x1fffe));\r
    pm[0]=(u16)(d>>16); pm[1]=(u16)d;\r
    return;\r
  }\r
\r
  // word RAM\r
  if ((a&0xfc0000)==0x200000) {\r
    if (d != 0) // don't log clears\r
      dprintf("m68k_wram w32: [%06x] %08x @%06x", a, d, SekPc);\r
    if (Pico_mcd->s68k_regs[3]&4) { // 1M mode?\r
      // TODO\r
    } else {\r
      // allow access in any mode, like Gens does\r
      u16 *pm=(u16 *)(Pico_mcd->word_ram+(a&0x3fffe));\r
      pm[0]=(u16)(d>>16); pm[1]=(u16)d;\r
    }\r
    return;\r
  }\r
\r
  if ((a&0xffffc0)==0xa12000)\r
    dprintf("m68k_regs w32: [%02x] %08x @%06x", a&0x3f, d, SekPc);\r
\r
  OtherWrite16(a,  (u16)(d>>16));\r
  OtherWrite16(a+2,(u16)d);\r
}\r
\r
\r
// -----------------------------------------------------------------\r
\r
\r
u8 PicoReadS68k8(u32 a)\r
{\r
  u32 d=0;\r
\r
  a&=0xffffff;\r
\r
  // prg RAM\r
  if (a < 0x80000) {\r
    d = *(Pico_mcd->prg_ram+(a^1));\r
    goto end;\r
  }\r
\r
  // regs\r
  if ((a&0xfffe00) == 0xff8000) {\r
    dprintf("s68k_regs r8: [%02x] @ %06x", a&0x1ff, SekPcS68k);\r
    d = s68k_reg_read16(a&~1, 8|(a&1)); if ((a&1)==0) d>>=8;\r
    dprintf("ret = %02x", (u8)d);\r
    goto end;\r
  }\r
\r
  // word RAM (2M area)\r
  if ((a&0xfc0000)==0x080000) { // 080000-0bffff\r
    dprintf("s68k_wram2M r8: [%06x] @%06x", a, SekPc);\r
    if (Pico_mcd->s68k_regs[3]&4) { // 1M mode?\r
      // TODO (decode)\r
      dprintf("(decode)");\r
    } else {\r
      // allow access in any mode, like Gens does\r
      d = Pico_mcd->word_ram[(a^1)&0x3ffff];\r
    }\r
    dprintf("ret = %02x", (u8)d);\r
    goto end;\r
  }\r
\r
  // word RAM (1M area)\r
  if ((a&0xfe0000)==0x0c0000 && (Pico_mcd->s68k_regs[3]&4)) { // 0c0000-0dffff\r
    dprintf("s68k_wram1M r8: [%06x] @%06x", a, SekPc);\r
    // TODO\r
    goto end;\r
  }\r
\r
  dprintf("s68k r8 : %06x,   %02x @%06x", a&0xffffff, (u8)d, SekPcS68k);\r
\r
  end:\r
\r
#ifdef __debug_io2\r
  dprintf("s68k r8 : %06x,   %02x @%06x", a&0xffffff, (u8)d, SekPcS68k);\r
#endif\r
  return (u8)d;\r
}\r
\r
u16 PicoReadS68k16(u32 a)\r
{\r
  u16 d=0;\r
\r
  a&=0xfffffe;\r
\r
  // prg RAM\r
  if (a < 0x80000) {\r
    d = *(u16 *)(Pico_mcd->prg_ram+a);\r
    goto end;\r
  }\r
\r
  // regs\r
  if ((a&0xfffe00) == 0xff8000) {\r
    dprintf("s68k_regs r16: [%02x] @ %06x", a&0x1fe, SekPcS68k);\r
    d = s68k_reg_read16(a, 16);\r
    dprintf("ret = %04x", d);\r
    goto end;\r
  }\r
\r
  // word RAM (2M area)\r
  if ((a&0xfc0000)==0x080000) { // 080000-0bffff\r
    dprintf("s68k_wram2M r16: [%06x] @%06x", a, SekPc);\r
    if (Pico_mcd->s68k_regs[3]&4) { // 1M mode?\r
      // TODO (decode)\r
      dprintf("(decode)");\r
    } else {\r
      // allow access in any mode, like Gens does\r
      d = *(u16 *)(Pico_mcd->word_ram+(a&0x3fffe));\r
    }\r
    dprintf("ret = %04x", (u8)d);\r
    goto end;\r
  }\r
\r
  // word RAM (1M area)\r
  if ((a&0xfe0000)==0x0c0000 && (Pico_mcd->s68k_regs[3]&4)) { // 0c0000-0dffff\r
    dprintf("s68k_wram1M r16: [%06x] @%06x", a, SekPc);\r
    // TODO\r
    goto end;\r
  }\r
\r
  dprintf("s68k r16: %06x, %04x  @%06x", a&0xffffff, d, SekPcS68k);\r
\r
  end:\r
\r
#ifdef __debug_io2\r
  dprintf("s68k r16: %06x, %04x  @%06x", a&0xffffff, d, SekPcS68k);\r
#endif\r
  return d;\r
}\r
\r
u32 PicoReadS68k32(u32 a)\r
{\r
  u32 d=0;\r
\r
  a&=0xfffffe;\r
\r
  // prg RAM\r
  if (a < 0x80000) {\r
    u16 *pm=(u16 *)(Pico_mcd->prg_ram+a);\r
    d = (pm[0]<<16)|pm[1];\r
    goto end;\r
  }\r
\r
  // regs\r
  if ((a&0xfffe00) == 0xff8000) {\r
    dprintf("s68k_regs r32: [%02x] @ %06x", a&0x1fe, SekPcS68k);\r
    d = (s68k_reg_read16(a, 32)<<16)|s68k_reg_read16(a+2, 32);\r
    dprintf("ret = %08x", d);\r
    goto end;\r
  }\r
\r
  // word RAM (2M area)\r
  if ((a&0xfc0000)==0x080000) { // 080000-0bffff\r
    dprintf("s68k_wram2M r32: [%06x] @%06x", a, SekPc);\r
    if (Pico_mcd->s68k_regs[3]&4) { // 1M mode?\r
      // TODO (decode)\r
      dprintf("(decode)");\r
    } else {\r
      // allow access in any mode, like Gens does\r
      u16 *pm=(u16 *)(Pico_mcd->word_ram+(a&0x3fffe)); d = (pm[0]<<16)|pm[1];\r
    }\r
    dprintf("ret = %08x", (u8)d);\r
    goto end;\r
  }\r
\r
  // word RAM (1M area)\r
  if ((a&0xfe0000)==0x0c0000 && (Pico_mcd->s68k_regs[3]&4)) { // 0c0000-0dffff\r
    dprintf("s68k_wram1M 32: [%06x] @%06x", a, SekPc);\r
    // TODO\r
    goto end;\r
  }\r
\r
  dprintf("s68k r32: %06x, %08x @%06x", a&0xffffff, d, SekPcS68k);\r
\r
  end:\r
\r
#ifdef __debug_io2\r
  dprintf("s68k r32: %06x, %08x @%06x", a&0xffffff, d, SekPcS68k);\r
#endif\r
  return d;\r
}\r
\r
// -----------------------------------------------------------------\r
\r
void PicoWriteS68k8(u32 a,u8 d)\r
{\r
#ifdef __debug_io2\r
  dprintf("s68k w8 : %06x,   %02x @%06x", a&0xffffff, d, SekPcS68k);\r
#endif\r
\r
  a&=0xffffff;\r
\r
  // prg RAM\r
  if (a < 0x80000) {\r
    u8 *pm=(u8 *)(Pico_mcd->prg_ram+(a^1));\r
    *pm=d;\r
    return;\r
  }\r
\r
  if (a != 0xff0011 && (a&0xff8000) == 0xff0000) // PCM hack\r
    return;\r
\r
  // regs\r
  if ((a&0xfffe00) == 0xff8000) {\r
    dprintf("s68k_regs w8: [%02x] %02x @ %06x", a&0x1ff, d, SekPcS68k);\r
    s68k_reg_write8(a,d,8);\r
    return;\r
  }\r
\r
  // word RAM (2M area)\r
  if ((a&0xfc0000)==0x080000) { // 080000-0bffff\r
    dprintf("s68k_wram2M w8: [%06x] %02x @%06x", a, d, SekPc);\r
    if (Pico_mcd->s68k_regs[3]&4) { // 1M mode?\r
      // TODO (decode)\r
      dprintf("(decode)");\r
    } else {\r
      // allow access in any mode, like Gens does\r
      u8 *pm=(u8 *)(Pico_mcd->word_ram+((a^1)&0x3ffff));\r
      *pm=d;\r
    }\r
    return;\r
  }\r
\r
  // word RAM (1M area)\r
  if ((a&0xfe0000)==0x0c0000 && (Pico_mcd->s68k_regs[3]&4)) { // 0c0000-0dffff\r
    if (d)\r
      dprintf("s68k_wram1M w8: [%06x] %02x @%06x", a, d, SekPc);\r
    // TODO\r
    return;\r
  }\r
\r
  dprintf("s68k w8 : %06x,   %02x @%06x", a&0xffffff, d, SekPcS68k);\r
}\r
\r
void PicoWriteS68k16(u32 a,u16 d)\r
{\r
#ifdef __debug_io2\r
  dprintf("s68k w16: %06x, %04x @%06x", a&0xffffff, d, SekPcS68k);\r
#endif\r
\r
  a&=0xfffffe;\r
\r
  // prg RAM\r
  if (a < 0x80000) {\r
    *(u16 *)(Pico_mcd->prg_ram+a)=d;\r
    return;\r
  }\r
\r
  // regs\r
  if ((a&0xfffe00) == 0xff8000) {\r
    dprintf("s68k_regs w16: [%02x] %04x @ %06x", a&0x1ff, d, SekPcS68k);\r
    s68k_reg_write8(a,  d>>8, 16);\r
    s68k_reg_write8(a+1,d&0xff, 16);\r
    return;\r
  }\r
\r
  // word RAM (2M area)\r
  if ((a&0xfc0000)==0x080000) { // 080000-0bffff\r
    dprintf("s68k_wram2M w16: [%06x] %04x @%06x", a, d, SekPc);\r
    if (Pico_mcd->s68k_regs[3]&4) { // 1M mode?\r
      // TODO (decode)\r
      dprintf("(decode)");\r
    } else {\r
      // allow access in any mode, like Gens does\r
      *(u16 *)(Pico_mcd->word_ram+(a&0x3fffe))=d;\r
    }\r
    return;\r
  }\r
\r
  // word RAM (1M area)\r
  if ((a&0xfe0000)==0x0c0000 && (Pico_mcd->s68k_regs[3]&4)) { // 0c0000-0dffff\r
    if (d)\r
      dprintf("s68k_wram1M w16: [%06x] %04x @%06x", a, d, SekPc);\r
    // TODO\r
    return;\r
  }\r
\r
  dprintf("s68k w16: %06x, %04x @%06x", a&0xffffff, d, SekPcS68k);\r
}\r
\r
void PicoWriteS68k32(u32 a,u32 d)\r
{\r
#ifdef __debug_io2\r
  dprintf("s68k w32: %06x, %08x @%06x", a&0xffffff, d, SekPcS68k);\r
#endif\r
\r
  a&=0xfffffe;\r
\r
  // prg RAM\r
  if (a < 0x80000) {\r
    u16 *pm=(u16 *)(Pico_mcd->prg_ram+a);\r
    pm[0]=(u16)(d>>16); pm[1]=(u16)d;\r
    return;\r
  }\r
\r
  // regs\r
  if ((a&0xfffe00) == 0xff8000) {\r
    dprintf("s68k_regs w32: [%02x] %08x @ %06x", a&0x1ff, d, SekPcS68k);\r
    s68k_reg_write8(a,   d>>24, 32);\r
    s68k_reg_write8(a+1,(d>>16)&0xff, 32);\r
    s68k_reg_write8(a+2,(d>>8) &0xff, 32);\r
    s68k_reg_write8(a+3, d     &0xff, 32);\r
    return;\r
  }\r
\r
  // word RAM (2M area)\r
  if ((a&0xfc0000)==0x080000) { // 080000-0bffff\r
    dprintf("s68k_wram2M w32: [%06x] %08x @%06x", a, d, SekPc);\r
    if (Pico_mcd->s68k_regs[3]&4) { // 1M mode?\r
      // TODO (decode)\r
      dprintf("(decode)");\r
    } else {\r
      // allow access in any mode, like Gens does\r
      u16 *pm=(u16 *)(Pico_mcd->word_ram+(a&0x3fffe));\r
      pm[0]=(u16)(d>>16); pm[1]=(u16)d;\r
    }\r
    return;\r
  }\r
\r
  // word RAM (1M area)\r
  if ((a&0xfe0000)==0x0c0000 && (Pico_mcd->s68k_regs[3]&4)) { // 0c0000-0dffff\r
    if (d)\r
      dprintf("s68k_wram1M w32: [%06x] %08x @%06x", a, d, SekPc);\r
    // TODO\r
    return;\r
  }\r
  dprintf("s68k w32: %06x, %08x @%06x", a&0xffffff, d, SekPcS68k);\r
}\r
\r
\r
\r
// -----------------------------------------------------------------\r
\r
#ifdef EMU_M68K\r
unsigned char  PicoReadCD8w (unsigned int a) {\r
	return m68ki_cpu_p == &PicoS68kCPU ? PicoReadS68k8(a) : PicoReadM68k8(a);\r
}\r
unsigned short PicoReadCD16w(unsigned int a) {\r
	return m68ki_cpu_p == &PicoS68kCPU ? PicoReadS68k16(a) : PicoReadM68k16(a);\r
}\r
unsigned int   PicoReadCD32w(unsigned int a) {\r
	return m68ki_cpu_p == &PicoS68kCPU ? PicoReadS68k32(a) : PicoReadM68k32(a);\r
}\r
void PicoWriteCD8w (unsigned int a, unsigned char d) {\r
	if (m68ki_cpu_p == &PicoS68kCPU) PicoWriteS68k8(a, d); else PicoWriteM68k8(a, d);\r
}\r
void PicoWriteCD16w(unsigned int a, unsigned short d) {\r
	if (m68ki_cpu_p == &PicoS68kCPU) PicoWriteS68k16(a, d); else PicoWriteM68k16(a, d);\r
}\r
void PicoWriteCD32w(unsigned int a, unsigned int d) {\r
	if (m68ki_cpu_p == &PicoS68kCPU) PicoWriteS68k32(a, d); else PicoWriteM68k32(a, d);\r
}\r
\r
// these are allowed to access RAM\r
unsigned int  m68k_read_pcrelative_CD8 (unsigned int a) {\r
  a&=0xffffff;\r
  if(m68ki_cpu_p == &PicoS68kCPU) {\r
    if (a < 0x80000) return *(u8 *)(Pico_mcd->prg_ram+(a^1)); // PRG Ram\r
    else dprintf("s68k read_pcrel8 @ %06x", a);\r
  } else {\r
    if(a<Pico.romsize)         return *(u8 *)(Pico.rom+(a^1)); // Rom\r
    if((a&0xe00000)==0xe00000) return *(u8 *)(Pico.ram+((a^1)&0xffff)); // Ram\r
  }\r
  return 0;//(u8)  lastread_d;\r
}\r
unsigned int  m68k_read_pcrelative_CD16(unsigned int a) {\r
  a&=0xffffff;\r
  if(m68ki_cpu_p == &PicoS68kCPU) {\r
    if (a < 0x80000) return *(u16 *)(Pico_mcd->prg_ram+(a&~1)); // PRG Ram\r
    else dprintf("s68k read_pcrel16 @ %06x", a);\r
  } else {\r
    if(a<Pico.romsize)         return *(u16 *)(Pico.rom+(a&~1)); // Rom\r
    if((a&0xe00000)==0xe00000) return *(u16 *)(Pico.ram+(a&0xfffe)); // Ram\r
  }\r
  return 0;//(u16) lastread_d;\r
}\r
unsigned int  m68k_read_pcrelative_CD32(unsigned int a) {\r
  a&=0xffffff;\r
  if(m68ki_cpu_p == &PicoS68kCPU) {\r
    if (a < 0x80000) { u16 *pm=(u16 *)(Pico_mcd->prg_ram+(a&~1)); return (pm[0]<<16)|pm[1]; } // PRG Ram\r
    else dprintf("s68k read_pcrel32 @ %06x", a);\r
  } else {\r
    if(a<Pico.romsize)         { u16 *pm=(u16 *)(Pico.rom+(a&~1));     return (pm[0]<<16)|pm[1]; }\r
    if((a&0xe00000)==0xe00000) { u16 *pm=(u16 *)(Pico.ram+(a&0xfffe)); return (pm[0]<<16)|pm[1]; } // Ram\r
  }\r
  return 0; //lastread_d;\r
}\r
#endif // EMU_M68K\r
\r