Shamusworld >> Repos - virtualjaguar/blob - src/jaguar.cpp

   1 //
   2 // JAGUAR.CPP
   3 //
   4 // by Cal2
   5 // GCC/SDL port by Niels Wagenaar (Linux/WIN32) and Caz (BeOS)
   6 // Cleanups and endian wrongness amelioration by James L. Hammons
   7 // Note: Endian wrongness probably stems from the MAME origins of this emu and
   8 //       the braindead way in which MAME handles memory. :-)
   9 //
  10
  11 #include "jaguar.h"
  12 #include "video.h"
  13 //#include "m68kdasmAG.h"
  14
  15 #define CPU_DEBUG
  16 //Do this in makefile??? Yes! Could, but it's easier to define here...
  17 #define LOG_UNMAPPED_MEMORY_ACCESSES
  18 #define CPU_DEBUG_MEMORY
  19
  20 // Private function prototypes
  21
  22 unsigned jaguar_unknown_readbyte(unsigned address, uint32 who = UNKNOWN);
  23 unsigned jaguar_unknown_readword(unsigned address, uint32 who = UNKNOWN);
  24 void jaguar_unknown_writebyte(unsigned address, unsigned data, uint32 who = UNKNOWN);
  25 void jaguar_unknown_writeword(unsigned address, unsigned data, uint32 who = UNKNOWN);
  26 void M68K_show_context(void);
  27
  28 // External variables
  29
  30 extern bool hardwareTypeNTSC;                                           // Set to false for PAL
  31 #ifdef CPU_DEBUG_MEMORY
  32 extern bool startMemLog;                                                        // Set by "e" key
  33 extern int effect_start;
  34 extern int effect_start2, effect_start3, effect_start4, effect_start5, effect_start6;
  35 #endif
  36
  37 // Memory debugging identifiers
  38
  39 char * whoName[9] =
  40         { "Unknown", "Jaguar", "DSP", "GPU", "TOM", "JERRY", "M68K", "Blitter", "OP" };
  41
  42 // These values are overridden by command line switches...
  43
  44 extern bool dsp_enabled;
  45 extern bool jaguar_use_bios;                                            // Default is now to USE the BIOS
  46 uint32 jaguar_active_memory_dumps = 0;
  47
  48 uint32 jaguar_mainRom_crc32;
  49
  50 /*static*/ uint8 * jaguar_mainRam = NULL;
  51 /*static*/ uint8 * jaguar_bootRom = NULL;
  52 /*static*/ uint8 * jaguar_mainRom = NULL;
  53 #ifdef CPU_DEBUG_MEMORY
  54 uint8 writeMemMax[0x400000], writeMemMin[0x400000];
  55 uint8 readMem[0x400000];
  56 uint32 returnAddr[4000], raPtr = 0xFFFFFFFF;
  57 #endif
  58
  59 //
  60 // Callback function to detect illegal instructions
  61 //
  62 //void GPUDumpDisassembly(void);
  63 //void GPUDumpRegisters(void);
  64 void M68KInstructionHook(void)
  65 {
  66         uint32 m68kPC = m68k_get_reg(NULL, M68K_REG_PC);
  67 /*      if (m68kPC >= 0x807EC4 && m68kPC <= 0x807EDB)
  68         {
  69                 static char buffer[2048];
  70                 m68k_disassemble(buffer, m68kPC, M68K_CPU_TYPE_68000);
  71                 WriteLog("%08X: %s", m68kPC, buffer);
  72                 WriteLog("\t\tA0=%08X, A1=%08X, D0=%08X, D1=%08X\n",
  73                         m68k_get_reg(NULL, M68K_REG_A0), m68k_get_reg(NULL, M68K_REG_A1),
  74                         m68k_get_reg(NULL, M68K_REG_D0), m68k_get_reg(NULL, M68K_REG_D1));
  75         }//*/
  76 /*      if (m68kPC == 0x8D0E48 && effect_start5)
  77         {
  78                 WriteLog("\nM68K: At collision detection code. Exiting!\n\n");
  79                 GPUDumpRegisters();
  80                 GPUDumpDisassembly();
  81                 log_done();
  82                 exit(0);
  83         }//*/
  84 /*      uint16 opcode = JaguarReadWord(m68kPC);
  85         if (opcode == 0x4E75)   // RTS
  86         {
  87                 if (startMemLog)
  88 //                      WriteLog("Jaguar: Returning from subroutine to %08X\n", JaguarReadLong(m68k_get_reg(NULL, M68K_REG_A7)));
  89                 {
  90                         uint32 addr = JaguarReadLong(m68k_get_reg(NULL, M68K_REG_A7));
  91                         bool found = false;
  92                         if (raPtr != 0xFFFFFFFF)
  93                         {
  94                                 for(uint32 i=0; i<=raPtr; i++)
  95                                 {
  96                                         if (returnAddr[i] == addr)
  97                                         {
  98                                                 found = true;
  99                                                 break;
 100                                         }
 101                                 }
 102                         }
 103
 104                         if (!found)
 105                                 returnAddr[++raPtr] = addr;
 106                 }
 107         }//*/
 108
 109 /*      static char buffer[2048];
 110         m68k_disassemble(buffer, m68kPC, M68K_CPU_TYPE_68000);
 111         WriteLog("%08X: %s \t\tD0=%08X, A0=%08X\n", m68kPC, buffer, m68k_get_reg(NULL, M68K_REG_D0), m68k_get_reg(NULL, M68K_REG_A0));//*/
 112
 113 /*      if (m68kPC == 0x803F16)
 114         {
 115                 WriteLog("M68K: Registers found at $803F16:\n");
 116                 WriteLog("\t68K PC=%06X\n", m68k_get_reg(NULL, M68K_REG_PC));
 117                 for(int i=M68K_REG_D0; i<=M68K_REG_D7; i++)
 118                         WriteLog("\tD%i = %08X\n", i-M68K_REG_D0, m68k_get_reg(NULL, (m68k_register_t)i));
 119                 WriteLog("\n");
 120                 for(int i=M68K_REG_A0; i<=M68K_REG_A7; i++)
 121                         WriteLog("\tA%i = %08X\n", i-M68K_REG_A0, m68k_get_reg(NULL, (m68k_register_t)i));
 122         }*/
 123
 124         if (!m68k_is_valid_instruction(m68k_read_memory_16(m68kPC), M68K_CPU_TYPE_68000))
 125         {
 126                 WriteLog("\nM68K encountered an illegal instruction at %08X!!!\n\nAborting!\n", m68kPC);
 127                 uint32 topOfStack = m68k_get_reg(NULL, M68K_REG_A7);
 128                 WriteLog("M68K: Top of stack: %08X. Stack trace:\n", JaguarReadLong(topOfStack));
 129                 for(int i=0; i<10; i++)
 130                         WriteLog("%06X: %08X\n", topOfStack - (i * 4), JaguarReadLong(topOfStack - (i * 4)));
 131                 WriteLog("Jaguar: VBL interrupt is %s\n", ((tom_irq_enabled(IRQ_VBLANK)) && (jaguar_interrupt_handler_is_valid(64))) ? "enabled" : "disabled");
 132                 M68K_show_context();
 133                 log_done();
 134                 exit(0);
 135         }//*/
 136 }
 137
 138 //
 139 // Musashi 68000 read/write/IRQ functions
 140 //
 141
 142 int irq_ack_handler(int level)
 143 {
 144         int vector = M68K_INT_ACK_AUTOVECTOR;
 145
 146         // The GPU/DSP/etc are probably *not* issuing an NMI, but it seems to work OK...
 147
 148         if (level == 7)
 149         {
 150                 m68k_set_irq(0);                                                // Clear the IRQ...
 151                 vector = 64;                                                    // Set user interrupt #0
 152         }
 153
 154         return vector;
 155 }
 156
 157 unsigned int m68k_read_memory_8(unsigned int address)
 158 {
 159 #ifdef CPU_DEBUG_MEMORY
 160         if ((address >= 0x000000) && (address <= 0x3FFFFF))
 161         {
 162                 if (startMemLog)
 163                         readMem[address] = 1;
 164         }
 165 #endif
 166 //WriteLog("[RM8] Addr: %08X\n", address);
 167         unsigned int retVal = 0;
 168
 169         if ((address >= 0x000000) && (address <= 0x3FFFFF))
 170                 retVal = jaguar_mainRam[address];
 171         else if ((address >= 0x800000) && (address <= 0xDFFFFF))
 172                 retVal = jaguar_mainRom[address - 0x800000];
 173         else if ((address >= 0xE00000) && (address <= 0xE3FFFF))
 174                 retVal = jaguar_bootRom[address - 0xE00000];
 175         else if ((address >= 0xDFFF00) && (address <= 0xDFFFFF))
 176                 retVal = CDROMReadByte(address);
 177         else if ((address >= 0xF00000) && (address <= 0xF0FFFF))
 178                 retVal = TOMReadByte(address, M68K);
 179         else if ((address >= 0xF10000) && (address <= 0xF1FFFF))
 180                 retVal = JERRYReadByte(address, M68K);
 181         else
 182                 retVal = jaguar_unknown_readbyte(address, M68K);
 183
 184     return retVal;
 185 }
 186
 187 void gpu_dump_disassembly(void);
 188 void gpu_dump_registers(void);
 189
 190 unsigned int m68k_read_memory_16(unsigned int address)
 191 {
 192 #ifdef CPU_DEBUG_MEMORY
 193 /*      if ((address >= 0x000000) && (address <= 0x3FFFFE))
 194         {
 195                 if (startMemLog)
 196                         readMem[address] = 1, readMem[address + 1] = 1;
 197         }//*/
 198 /*      if (effect_start && (address >= 0x8064FC && address <= 0x806501))
 199         {
 200                 return 0x4E71;  // NOP
 201         }
 202         if (effect_start2 && (address >= 0x806502 && address <= 0x806507))
 203         {
 204                 return 0x4E71;  // NOP
 205         }
 206         if (effect_start3 && (address >= 0x806512 && address <= 0x806517))
 207         {
 208                 return 0x4E71;  // NOP
 209         }
 210         if (effect_start4 && (address >= 0x806524 && address <= 0x806527))
 211         {
 212                 return 0x4E71;  // NOP
 213         }
 214         if (effect_start5 && (address >= 0x80653E && address <= 0x806543)) //Collision detection!
 215         {
 216                 return 0x4E71;  // NOP
 217         }
 218         if (effect_start6 && (address >= 0x806544 && address <= 0x806547))
 219         {
 220                 return 0x4E71;  // NOP
 221         }//*/
 222 #endif
 223 //WriteLog("[RM16] Addr: %08X\n", address);
 224 /*if (m68k_get_reg(NULL, M68K_REG_PC) == 0x00005FBA)
 225 //      for(int i=0; i<10000; i++)
 226         WriteLog("[M68K] In routine #6!\n");//*/
 227 //if (m68k_get_reg(NULL, M68K_REG_PC) == 0x00006696) // GPU Program #4
 228 //if (m68k_get_reg(NULL, M68K_REG_PC) == 0x00005B3C)    // GPU Program #2
 229 /*if (m68k_get_reg(NULL, M68K_REG_PC) == 0x00005BA8)    // GPU Program #3
 230 {
 231         WriteLog("[M68K] About to run GPU! (Addr:%08X, data:%04X)\n", address, TOMReadWord(address));
 232         gpu_dump_registers();
 233         gpu_dump_disassembly();
 234 //      for(int i=0; i<10000; i++)
 235 //              WriteLog("[M68K] About to run GPU!\n");
 236 }//*/
 237 //WriteLog("[WM8  PC=%08X] Addr: %08X, val: %02X\n", m68k_get_reg(NULL, M68K_REG_PC), address, value);
 238 /*if (m68k_get_reg(NULL, M68K_REG_PC) >= 0x00006696 && m68k_get_reg(NULL, M68K_REG_PC) <= 0x000066A8)
 239 {
 240         if (address == 0x000066A0)
 241         {
 242                 gpu_dump_registers();
 243                 gpu_dump_disassembly();
 244         }
 245         for(int i=0; i<10000; i++)
 246                 WriteLog("[M68K] About to run GPU! (Addr:%08X, data:%04X)\n", address, TOMReadWord(address));
 247 }//*/
 248     unsigned int retVal = 0;
 249
 250         if ((address >= 0x000000) && (address <= 0x3FFFFE))
 251                 retVal = (jaguar_mainRam[address] << 8) | jaguar_mainRam[address+1];
 252         else if ((address >= 0x800000) && (address <= 0xDFFFFE))
 253                 retVal = (jaguar_mainRom[address - 0x800000] << 8) | jaguar_mainRom[address - 0x800000 + 1];
 254         else if ((address >= 0xE00000) && (address <= 0xE3FFFE))
 255                 retVal = (jaguar_bootRom[address - 0xE00000] << 8) | jaguar_bootRom[address - 0xE00000 + 1];
 256         else if ((address >= 0xDFFF00) && (address <= 0xDFFFFE))
 257                 retVal = CDROMReadWord(address, M68K);
 258         else if ((address >= 0xF00000) && (address <= 0xF0FFFE))
 259                 retVal = TOMReadWord(address, M68K);
 260         else if ((address >= 0xF10000) && (address <= 0xF1FFFE))
 261                 retVal = JERRYReadWord(address, M68K);
 262         else
 263                 retVal = jaguar_unknown_readword(address, M68K);
 264
 265     return retVal;
 266 }
 267
 268 unsigned int m68k_read_memory_32(unsigned int address)
 269 {
 270 //WriteLog("--> [RM32]\n");
 271     return (m68k_read_memory_16(address) << 16) | m68k_read_memory_16(address + 2);
 272 }
 273
 274 void m68k_write_memory_8(unsigned int address, unsigned int value)
 275 {
 276 #ifdef CPU_DEBUG_MEMORY
 277         if ((address >= 0x000000) && (address <= 0x3FFFFF))
 278         {
 279                 if (startMemLog)
 280                 {
 281                         if (value > writeMemMax[address])
 282                                 writeMemMax[address] = value;
 283                         if (value < writeMemMin[address])
 284                                 writeMemMin[address] = value;
 285                 }
 286         }
 287 #endif
 288 //if ((address >= 0x1FF020 && address <= 0x1FF03F) || (address >= 0x1FF820 && address <= 0x1FF83F))
 289 //      WriteLog("M68K: Writing %02X at %08X\n", value, address);
 290 //WriteLog("[WM8  PC=%08X] Addr: %08X, val: %02X\n", m68k_get_reg(NULL, M68K_REG_PC), address, value);
 291         if ((address >= 0x000000) && (address <= 0x3FFFFF))
 292                 jaguar_mainRam[address] = value;
 293         else if ((address >= 0xDFFF00) && (address <= 0xDFFFFF))
 294                 CDROMWriteByte(address, value, M68K);
 295         else if ((address >= 0xF00000) && (address <= 0xF0FFFF))
 296                 TOMWriteByte(address, value, M68K);
 297         else if ((address >= 0xF10000) && (address <= 0xF1FFFF))
 298                 JERRYWriteByte(address, value, M68K);
 299         else
 300                 jaguar_unknown_writebyte(address, value, M68K);
 301 }
 302
 303 void m68k_write_memory_16(unsigned int address, unsigned int value)
 304 {
 305 #ifdef CPU_DEBUG_MEMORY
 306         if ((address >= 0x000000) && (address <= 0x3FFFFE))
 307         {
 308                 if (startMemLog)
 309                 {
 310                         uint8 hi = value >> 8, lo = value & 0xFF;
 311
 312                         if (hi > writeMemMax[address])
 313                                 writeMemMax[address] = hi;
 314                         if (hi < writeMemMin[address])
 315                                 writeMemMin[address] = hi;
 316
 317                         if (lo > writeMemMax[address+1])
 318                                 writeMemMax[address+1] = lo;
 319                         if (lo < writeMemMin[address+1])
 320                                 writeMemMin[address+1] = lo;
 321                 }
 322         }
 323 #endif
 324 //if ((address >= 0x1FF020 && address <= 0x1FF03F) || (address >= 0x1FF820 && address <= 0x1FF83F))
 325 //      WriteLog("M68K: Writing %04X at %08X\n", value, address);
 326 //WriteLog("[WM16 PC=%08X] Addr: %08X, val: %04X\n", m68k_get_reg(NULL, M68K_REG_PC), address, value);
 327 //if (address >= 0xF02200 && address <= 0xF0229F)
 328 //      WriteLog("M68K: Writing to blitter --> %04X at %08X\n", value, address);
 329 //if (address >= 0x0E75D0 && address <= 0x0E75E7)
 330 //      WriteLog("M68K: Writing %04X at %08X, M68K PC=%08X\n", value, address, m68k_get_reg(NULL, M68K_REG_PC));
 331 /*extern uint32 totalFrames;
 332 if (address == 0xF02114)
 333         WriteLog("M68K: Writing to GPU_CTRL (frame:%u)... [M68K PC:%08X]\n", totalFrames, m68k_get_reg(NULL, M68K_REG_PC));
 334 if (address == 0xF02110)
 335         WriteLog("M68K: Writing to GPU_PC (frame:%u)... [M68K PC:%08X]\n", totalFrames, m68k_get_reg(NULL, M68K_REG_PC));//*/
 336 //if (address >= 0xF03B00 && address <= 0xF03DFF)
 337 //      WriteLog("M68K: Writing %04X to %08X...\n", value, address);
 338
 339         if ((address >= 0x000000) && (address <= 0x3FFFFE))
 340         {
 341 /*              jaguar_mainRam[address] = value >> 8;
 342                 jaguar_mainRam[address + 1] = value & 0xFF;*/
 343                 SET16(jaguar_mainRam, address, value);
 344         }
 345         else if ((address >= 0xDFFF00) && (address <= 0xDFFFFE))
 346                 CDROMWriteWord(address, value, M68K);
 347         else if ((address >= 0xF00000) && (address <= 0xF0FFFE))
 348                 TOMWriteWord(address, value, M68K);
 349         else if ((address >= 0xF10000) && (address <= 0xF1FFFE))
 350                 JERRYWriteWord(address, value, M68K);
 351         else
 352         {
 353                 jaguar_unknown_writeword(address, value, M68K);
 354                 WriteLog("\tA0=%08X, A1=%08X, D0=%08X, D1=%08X\n",
 355                         m68k_get_reg(NULL, M68K_REG_A0), m68k_get_reg(NULL, M68K_REG_A1),
 356                         m68k_get_reg(NULL, M68K_REG_D0), m68k_get_reg(NULL, M68K_REG_D1));
 357         }
 358 }
 359
 360 void m68k_write_memory_32(unsigned int address, unsigned int value)
 361 {
 362 //WriteLog("--> [WM32]\n");
 363         m68k_write_memory_16(address, value >> 16);
 364         m68k_write_memory_16(address + 2, value & 0xFFFF);
 365 }
 366
 367
 368 uint32 jaguar_get_handler(uint32 i)
 369 {
 370         return JaguarReadLong(i * 4);
 371 }
 372
 373 uint32 jaguar_interrupt_handler_is_valid(uint32 i)
 374 {
 375         uint32 handler = jaguar_get_handler(i);
 376         if (handler && (handler != 0xFFFFFFFF))
 377                 return 1;
 378         else
 379                 return 0;
 380 }
 381
 382 void M68K_show_context(void)
 383 {
 384         WriteLog("\t68K PC=%06X\n", m68k_get_reg(NULL, M68K_REG_PC));
 385         for(int i=M68K_REG_D0; i<=M68K_REG_D7; i++)
 386                 WriteLog("\tD%i = %08X\n", i-M68K_REG_D0, m68k_get_reg(NULL, (m68k_register_t)i));
 387         WriteLog("\n");
 388         for(int i=M68K_REG_A0; i<=M68K_REG_A7; i++)
 389                 WriteLog("\tA%i = %08X\n", i-M68K_REG_A0, m68k_get_reg(NULL, (m68k_register_t)i));
 390
 391         WriteLog("68K disasm\n");
 392 //      jaguar_dasm(s68000readPC()-0x1000,0x20000);
 393         jaguar_dasm(m68k_get_reg(NULL, M68K_REG_PC) - 0x80, 0x200);
 394 //      jaguar_dasm(0x5000, 0x14414);
 395
 396         WriteLog("..................\n");
 397
 398         if (tom_irq_enabled(IRQ_VBLANK))
 399         {
 400                 WriteLog("vblank int: enabled\n");
 401                 jaguar_dasm(jaguar_get_handler(64), 0x200);
 402         }
 403         else
 404                 WriteLog("vblank int: disabled\n");
 405
 406         WriteLog("..................\n");
 407
 408         for(int i=0; i<256; i++)
 409                 WriteLog("handler %03i at $%08X\n", i, (unsigned int)jaguar_get_handler(i));
 410 }
 411
 412 //
 413 // Unknown read/write byte/word routines
 414 //
 415
 416 // It's hard to believe that developers would be sloppy with their memory writes, yet in
 417 // some cases the developers screwed up royal. E.g., Club Drive has the following code:
 418 //
 419 // 807EC4: movea.l #$f1b000, A1
 420 // 807ECA: movea.l #$8129e0, A0
 421 // 807ED0: move.l  A0, D0
 422 // 807ED2: move.l  #$f1bb94, D1
 423 // 807ED8: sub.l   D0, D1
 424 // 807EDA: lsr.l   #2, D1
 425 // 807EDC: move.l  (A0)+, (A1)+
 426 // 807EDE: dbra    D1, 807edc
 427 //
 428 // The problem is at $807ED0--instead of putting A0 into D0, they really meant to put A1
 429 // in. This mistake causes it to try and overwrite approximately $700000 worth of address
 430 // space! (That is, unless the 68K causes a bus error...)
 431
 432 void jaguar_unknown_writebyte(unsigned address, unsigned data, uint32 who/*=UNKNOWN*/)
 433 {
 434 #ifdef LOG_UNMAPPED_MEMORY_ACCESSES
 435         WriteLog("Jaguar: Unknown byte %02X written at %08X by %s (M68K PC=%06X)\n", data, address, whoName[who], m68k_get_reg(NULL, M68K_REG_PC));
 436         extern bool finished;
 437         finished = true;
 438         extern bool doDSPDis;
 439         if (who == DSP)
 440                 doDSPDis = true;
 441 #endif
 442 }
 443
 444 void jaguar_unknown_writeword(unsigned address, unsigned data, uint32 who/*=UNKNOWN*/)
 445 {
 446 #ifdef LOG_UNMAPPED_MEMORY_ACCESSES
 447         WriteLog("Jaguar: Unknown word %04X written at %08X by %s (M68K PC=%06X)\n", data, address, whoName[who], m68k_get_reg(NULL, M68K_REG_PC));
 448         extern bool finished;
 449         finished = true;
 450         extern bool doDSPDis;
 451         if (who == DSP)
 452                 doDSPDis = true;
 453 #endif
 454 }
 455
 456 unsigned jaguar_unknown_readbyte(unsigned address, uint32 who/*=UNKNOWN*/)
 457 {
 458 #ifdef LOG_UNMAPPED_MEMORY_ACCESSES
 459         WriteLog("Jaguar: Unknown byte read at %08X by %s (M68K PC=%06X)\n", address, whoName[who], m68k_get_reg(NULL, M68K_REG_PC));
 460         extern bool finished;
 461         finished = true;
 462         extern bool doDSPDis;
 463         if (who == DSP)
 464                 doDSPDis = true;
 465 #endif
 466     return 0xFF;
 467 }
 468
 469 unsigned jaguar_unknown_readword(unsigned address, uint32 who/*=UNKNOWN*/)
 470 {
 471 #ifdef LOG_UNMAPPED_MEMORY_ACCESSES
 472         WriteLog("Jaguar: Unknown word read at %08X by %s (M68K PC=%06X)\n", address, whoName[who], m68k_get_reg(NULL, M68K_REG_PC));
 473         extern bool finished;
 474         finished = true;
 475         extern bool doDSPDis;
 476         if (who == DSP)
 477                 doDSPDis = true;
 478 #endif
 479     return 0xFFFF;
 480 }
 481
 482 //
 483 // Disassemble M68K instructions at the given offset
 484 //
 485
 486 unsigned int m68k_read_disassembler_8(unsigned int address)
 487 {
 488         return m68k_read_memory_8(address);
 489 }
 490
 491 unsigned int m68k_read_disassembler_16(unsigned int address)
 492 {
 493         return m68k_read_memory_16(address);
 494 }
 495
 496 unsigned int m68k_read_disassembler_32(unsigned int address)
 497 {
 498         return m68k_read_memory_32(address);
 499 }
 500
 501 void jaguar_dasm(uint32 offset, uint32 qt)
 502 {
 503 #ifdef CPU_DEBUG
 504         static char buffer[2048];//, mem[64];
 505         int pc = offset, oldpc;
 506
 507         for(uint32 i=0; i<qt; i++)
 508         {
 509 /*              oldpc = pc;
 510                 for(int j=0; j<64; j++)
 511                         mem[j^0x01] = jaguar_byte_read(pc + j);
 512
 513                 pc += Dasm68000((char *)mem, buffer, 0);
 514                 WriteLog("%08X: %s\n", oldpc, buffer);//*/
 515                 oldpc = pc;
 516                 pc += m68k_disassemble(buffer, pc, M68K_CPU_TYPE_68000);
 517                 WriteLog("%08X: %s\n", oldpc, buffer);//*/
 518         }
 519 #endif
 520 }
 521
 522 uint8 JaguarReadByte(uint32 offset, uint32 who/*=UNKNOWN*/)
 523 {
 524         uint8 data = 0x00;
 525
 526         offset &= 0xFFFFFF;
 527         if (offset < 0x400000)
 528                 data = jaguar_mainRam[offset & 0x3FFFFF];
 529         else if ((offset >= 0x800000) && (offset < 0xC00000))
 530                 data = jaguar_mainRom[offset - 0x800000];
 531         else if ((offset >= 0xDFFF00) && (offset <= 0xDFFFFF))
 532                 data = CDROMReadByte(offset, who);
 533         else if ((offset >= 0xE00000) && (offset < 0xE40000))
 534                 data = jaguar_bootRom[offset & 0x3FFFF];
 535         else if ((offset >= 0xF00000) && (offset < 0xF10000))
 536                 data = TOMReadByte(offset, who);
 537         else if ((offset >= 0xF10000) && (offset < 0xF20000))
 538                 data = JERRYReadByte(offset, who);
 539         else
 540                 data = jaguar_unknown_readbyte(offset, who);
 541
 542         return data;
 543 }
 544
 545 uint16 JaguarReadWord(uint32 offset, uint32 who/*=UNKNOWN*/)
 546 {
 547         offset &= 0xFFFFFF;
 548         if (offset <= 0x3FFFFE)
 549         {
 550                 return (jaguar_mainRam[(offset+0) & 0x3FFFFF] << 8) | jaguar_mainRam[(offset+1) & 0x3FFFFF];
 551         }
 552         else if ((offset >= 0x800000) && (offset <= 0xBFFFFE))
 553         {
 554                 offset -= 0x800000;
 555                 return (jaguar_mainRom[offset+0] << 8) | jaguar_mainRom[offset+1];
 556         }
 557 //      else if ((offset >= 0xDFFF00) && (offset < 0xDFFF00))
 558         else if ((offset >= 0xDFFF00) && (offset <= 0xDFFFFE))
 559                 return CDROMReadWord(offset, who);
 560         else if ((offset >= 0xE00000) && (offset <= 0xE3FFFE))
 561                 return (jaguar_bootRom[(offset+0) & 0x3FFFF] << 8) | jaguar_bootRom[(offset+1) & 0x3FFFF];
 562         else if ((offset >= 0xF00000) && (offset <= 0xF0FFFE))
 563                 return TOMReadWord(offset, who);
 564         else if ((offset >= 0xF10000) && (offset <= 0xF1FFFE))
 565                 return JERRYReadWord(offset, who);
 566
 567         return jaguar_unknown_readword(offset, who);
 568 }
 569
 570 void JaguarWriteByte(uint32 offset, uint8 data, uint32 who/*=UNKNOWN*/)
 571 {
 572         offset &= 0xFFFFFF;
 573         if (offset < 0x400000)
 574         {
 575                 jaguar_mainRam[offset & 0x3FFFFF] = data;
 576                 return;
 577         }
 578         else if ((offset >= 0xDFFF00) && (offset <= 0xDFFFFF))
 579         {
 580                 CDROMWriteByte(offset, data, who);
 581                 return;
 582         }
 583         else if ((offset >= 0xF00000) && (offset <= 0xF0FFFF))
 584         {
 585                 TOMWriteByte(offset, data, who);
 586                 return;
 587         }
 588         else if ((offset >= 0xF10000) && (offset <= 0xF1FFFF))
 589         {
 590                 JERRYWriteByte(offset, data, who);
 591                 return;
 592         }
 593
 594         jaguar_unknown_writebyte(offset, data, who);
 595 }
 596
 597 void JaguarWriteWord(uint32 offset, uint16 data, uint32 who/*=UNKNOWN*/)
 598 {
 599 //TEMP--Mirror of F03000? Yes, but only 32-bit CPUs can do it (i.e., NOT the 68K!)
 600 // PLUS, you would handle this in the GPU/DSP WroteLong code! Not here!
 601         offset &= 0xFFFFFF;
 602
 603         if (offset <= 0x3FFFFE)
 604         {
 605 if (offset == 0x670C)
 606         WriteLog("Jaguar: %s writing to location $670C...\n", whoName[who]);
 607
 608                 jaguar_mainRam[(offset+0) & 0x3FFFFF] = (data>>8) & 0xFF;
 609                 jaguar_mainRam[(offset+1) & 0x3FFFFF] = data & 0xFF;
 610                 return;
 611         }
 612         else if (offset >= 0xDFFF00 && offset <= 0xDFFFFE)
 613         {
 614                 CDROMWriteWord(offset, data, who);
 615                 return;
 616         }
 617         else if (offset >= 0xF00000 && offset <= 0xF0FFFE)
 618         {
 619                 TOMWriteWord(offset, data, who);
 620                 return;
 621         }
 622         else if (offset >= 0xF10000 && offset <= 0xF1FFFE)
 623         {
 624                 JERRYWriteWord(offset, data, who);
 625                 return;
 626         }
 627         // Don't bomb on attempts to write to ROM
 628         else if (offset >= 0x800000 && offset <= 0xEFFFFF)
 629                 return;
 630
 631         jaguar_unknown_writeword(offset, data, who);
 632 }
 633
 634 // We really should re-do this so that it does *real* 32-bit access... !!! FIX !!!
 635 uint32 JaguarReadLong(uint32 offset, uint32 who/*=UNKNOWN*/)
 636 {
 637         return (JaguarReadWord(offset, who) << 16) | JaguarReadWord(offset+2, who);
 638 }
 639
 640 // We really should re-do this so that it does *real* 32-bit access... !!! FIX !!!
 641 void JaguarWriteLong(uint32 offset, uint32 data, uint32 who/*=UNKNOWN*/)
 642 {
 643         JaguarWriteWord(offset, data >> 16, who);
 644         JaguarWriteWord(offset+2, data & 0xFFFF, who);
 645 }
 646
 647 //
 648 // Jaguar console initialization
 649 //
 650 void jaguar_init(void)
 651 {
 652 #ifdef CPU_DEBUG_MEMORY
 653         memset(readMem, 0x00, 0x400000);
 654         memset(writeMemMin, 0xFF, 0x400000);
 655         memset(writeMemMax, 0x00, 0x400000);
 656 #endif
 657         memory_malloc_secure((void **)&jaguar_mainRam, 0x400000, "Jaguar 68K CPU RAM");
 658         memory_malloc_secure((void **)&jaguar_bootRom, 0x040000, "Jaguar 68K CPU BIOS ROM");
 659         memory_malloc_secure((void **)&jaguar_mainRom, 0x600000, "Jaguar 68K CPU ROM");
 660         memset(jaguar_mainRam, 0x00, 0x400000);
 661 //      memset(jaguar_mainRom, 0xFF, 0x200000); // & set it to all Fs...
 662 //      memset(jaguar_mainRom, 0x00, 0x200000); // & set it to all 0s...
 663         memset(jaguar_mainRom, 0x01, 0x600000); // & set it to all 01s...
 664
 665 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\Brain Dead 13.cdi");
 666 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\baldies.cdi");
 667 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\mystdemo.cdi");
 668 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\battlemorph.cdi");
 669 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\primalrage.cdi");
 670 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\Dragons Lair.cdi");
 671
 672         m68k_set_cpu_type(M68K_CPU_TYPE_68000);
 673         gpu_init();
 674         DSPInit();
 675         tom_init();
 676         jerry_init();
 677         cdrom_init();
 678 }
 679
 680 void jaguar_done(void)
 681 {
 682 #ifdef CPU_DEBUG_MEMORY
 683 /*      WriteLog("\n\nM68000 disassembly at $8D0D44 (collision routine!)...\n");
 684         jaguar_dasm(0x8D0D44, 5000);
 685         WriteLog("\n");//*/
 686 /*      WriteLog("\n\nM68000 disassembly at $806300 (look @ $806410)...\n");
 687         jaguar_dasm(0x806300, 5000);
 688         WriteLog("\n");//*/
 689
 690 /*      WriteLog("\nJaguar: Memory Usage Stats (return addresses)\n\n");
 691
 692         for(uint32 i=0; i<=raPtr; i++)
 693         {
 694                 WriteLog("\t%08X\n", returnAddr[i]);
 695                 WriteLog("M68000 disassembly at $%08X...\n", returnAddr[i] - 16);
 696                 jaguar_dasm(returnAddr[i] - 16, 16);
 697                 WriteLog("\n");
 698         }
 699         WriteLog("\n");//*/
 700
 701 /*      int start = 0, end = 0;
 702         bool endTriggered = false, startTriggered = false;
 703         for(int i=0; i<0x400000; i++)
 704         {
 705                 if (readMem[i] && writeMemMin[i] != 0xFF && writeMemMax != 0x00)
 706                 {
 707                         if (!startTriggered)
 708                                 startTriggered = true, endTriggered = false, start = i;
 709
 710                         WriteLog("\t\tMin/Max @ %06X: %u/%u\n", i, writeMemMin[i], writeMemMax[i]);
 711                 }
 712                 else
 713                 {
 714                         if (!endTriggered)
 715                         {
 716                                 end = i - 1, endTriggered = true, startTriggered = false;
 717                                 WriteLog("\tMemory range accessed: %06X - %06X\n", start, end);
 718                         }
 719                 }
 720         }
 721         WriteLog("\n");//*/
 722 #endif
 723 //#ifdef CPU_DEBUG
 724 //      for(int i=M68K_REG_A0; i<=M68K_REG_A7; i++)
 725 //              WriteLog("\tA%i = 0x%.8x\n", i-M68K_REG_A0, m68k_get_reg(NULL, (m68k_register_t)i));
 726         int32 topOfStack = m68k_get_reg(NULL, M68K_REG_A7);
 727         WriteLog("M68K: Top of stack: %08X. Stack trace:\n", JaguarReadLong(topOfStack));
 728         for(int i=-2; i<9; i++)
 729                 WriteLog("%06X: %08X\n", topOfStack + (i * 4), JaguarReadLong(topOfStack + (i * 4)));
 730
 731 /*      WriteLog("\nM68000 disassembly at $802288...\n");
 732         jaguar_dasm(0x802288, 3);
 733         WriteLog("\nM68000 disassembly at $802200...\n");
 734         jaguar_dasm(0x802200, 500);
 735         WriteLog("\nM68000 disassembly at $802518...\n");
 736         jaguar_dasm(0x802518, 100);//*/
 737
 738 /*      WriteLog("\n\nM68000 disassembly at $803F00 (look @ $803F2A)...\n");
 739         jaguar_dasm(0x803F00, 500);
 740         WriteLog("\n");//*/
 741
 742 /*      WriteLog("\n\nM68000 disassembly at $802B00 (look @ $802B5E)...\n");
 743         jaguar_dasm(0x802B00, 500);
 744         WriteLog("\n");//*/
 745
 746 /*      WriteLog("\n\nM68000 disassembly at $809900 (look @ $8099F8)...\n");
 747         jaguar_dasm(0x809900, 500);
 748         WriteLog("\n");//*/
 749 //8099F8
 750 /*      WriteLog("\n\nDump of $8093C8:\n\n");
 751         for(int i=0x8093C8; i<0x809900; i+=4)
 752                 WriteLog("%06X: %08X\n", i, JaguarReadLong(i));//*/
 753 /*      WriteLog("\n\nM68000 disassembly at $90006C...\n");
 754         jaguar_dasm(0x90006C, 500);
 755         WriteLog("\n");//*/
 756
 757 //      WriteLog("Jaguar: CD BIOS version %04X\n", JaguarReadWord(0x3004));
 758         WriteLog("Jaguar: Interrupt enable = %02X\n", TOMReadByte(0xF000E1) & 0x1F);
 759         WriteLog("Jaguar: VBL interrupt is %s\n", ((tom_irq_enabled(IRQ_VBLANK)) && (jaguar_interrupt_handler_is_valid(64))) ? "enabled" : "disabled");
 760         M68K_show_context();
 761 //#endif
 762
 763         cd_bios_done();
 764         cdrom_done();
 765         gpu_done();
 766         DSPDone();
 767         tom_done();
 768         jerry_done();
 769
 770         memory_free(jaguar_mainRom);
 771         memory_free(jaguar_bootRom);
 772         memory_free(jaguar_mainRam);
 773 }
 774
 775 void jaguar_reset(void)
 776 {
 777         if (jaguar_use_bios)
 778                 memcpy(jaguar_mainRam, jaguar_bootRom, 8);
 779         else
 780         {
 781                 SET32(jaguar_mainRam, 4, 0x00802000);
 782                 // Handle PD stuff...
 783                 // This should definitely go elsewhere (like in the cart load section)!
 784                 if (jaguar_mainRom[0] == 0x60 && jaguar_mainRom[1] == 0x1A)
 785                 {
 786                         uint32 runAddress = GET32(jaguar_mainRom, 0x2A);
 787                         uint32 progLength = GET32(jaguar_mainRom, 0x02);
 788                         WriteLog("Setting up PD ROM... Run address: %08X, length: %08X\n", runAddress, progLength);
 789                         memcpy(jaguar_mainRam + runAddress, jaguar_mainRom + 0x2E, progLength);
 790                         SET32(jaguar_mainRam, 4, runAddress);
 791                 }
 792         }
 793
 794 //      WriteLog("jaguar_reset():\n");
 795 //#ifdef SOUND_OUTPUT
 796 //      ws_audio_reset();
 797 //#endif
 798         cd_bios_reset();
 799         tom_reset();
 800         jerry_reset();
 801         gpu_reset();
 802         DSPReset();
 803         cdrom_reset();
 804     m68k_pulse_reset();                         // Reset the 68000
 805         WriteLog("\t68K PC=%06X SP=%08X\n", m68k_get_reg(NULL, M68K_REG_PC), m68k_get_reg(NULL, M68K_REG_A7));
 806 }
 807
 808 //
 809 // Main Jaguar execution loop (1 frame)
 810 //
 811 void JaguarExecute(int16 * backbuffer, bool render)
 812 {
 813         uint16 vp = TOMReadWord(0xF0003E) + 1;//Hmm. This is a WO register. Will work? Looks like. But wrong behavior!
 814         uint16 vi = TOMReadWord(0xF0004E);//Another WO register...
 815         uint16 vdb = TOMReadWord(0xF00046);
 816 //Note: This is the *definite* end of the display, though VDE *might* be less than this...
 817 //      uint16 vbb = TOMReadWord(0xF00040);
 818 //It seems that they mean it when they say that VDE is the end of object processing.
 819 //However, we need to be able to tell the OP (or TOM) that we've reached the end of the
 820 //buffer and not to write any more pixels... !!! FIX !!!
 821         uint16 vde = TOMReadWord(0xF00048);
 822
 823         uint16 refreshRate = (hardwareTypeNTSC ? 60 : 50);
 824         // Should these be hardwired or read from VP? Yes, from VP!
 825         uint32 M68KCyclesPerScanline
 826                 = (hardwareTypeNTSC ? M68K_CLOCK_RATE_NTSC : M68K_CLOCK_RATE_PAL) / (vp * refreshRate);
 827         uint32 RISCCyclesPerScanline
 828                 = (hardwareTypeNTSC ? RISC_CLOCK_RATE_NTSC : RISC_CLOCK_RATE_PAL) / (vp * refreshRate);
 829
 830 /*extern int effect_start;
 831 if (effect_start)
 832 {
 833         WriteLog("JagExe: VP=%u, VI=%u, VDB=%u, VBB=%u CPU CPS=%u, GPU CPS=%u\n", vp, vi, vdb, vbb, M68KCyclesPerScanline, RISCCyclesPerScanline);
 834 }//*/
 835
 836         for(uint16 i=0; i<vp; i++)
 837         {
 838                 // Increment the horizontal count (why? RNG?)
 839                 TOMWriteWord(0xF00004, (TOMReadWord(0xF00004) + 1) & 0x7FF);
 840
 841                 TOMWriteWord(0xF00006, i);                                      // Write the VC
 842
 843                 if (i == vi)                                                            // Time for Vertical Interrupt?
 844                 {
 845                         if (tom_irq_enabled(IRQ_VBLANK))// && jaguar_interrupt_handler_is_valid(64))
 846                         {
 847                                 // We don't have to worry about autovectors & whatnot because the Jaguar
 848                                 // tells you through its HW registers who sent the interrupt...
 849                                 tom_set_pending_video_int();
 850                                 m68k_set_irq(7);
 851                         }
 852                 }
 853
 854 //              uint32 invalid_instruction_address = s68000exec(M68KCyclesPerScanline);
 855 //              if (invalid_instruction_address != 0x80000000)
 856 //                      cd_bios_process(invalid_instruction_address);
 857                 m68k_execute(M68KCyclesPerScanline);
 858                 // No CD handling... !!! FIX !!!
 859                 cd_bios_exec(i);        // NOTE: Ignores parameter...
 860                 tom_pit_exec(RISCCyclesPerScanline);
 861                 jerry_pit_exec(RISCCyclesPerScanline);
 862                 jerry_i2s_exec(RISCCyclesPerScanline);
 863                 gpu_exec(RISCCyclesPerScanline);
 864                 if (dsp_enabled)
 865                         DSPExec(RISCCyclesPerScanline);
 866
 867 //Interlacing is still not handled correctly here... !!! FIX !!!
 868                 if (i >= vdb && i < vde)//vbb)
 869                 {
 870                         if (!(i & 0x01))                                                // Execute OP only on even lines (non-interlaced only!)
 871                         {
 872                                 tom_exec_scanline(backbuffer, i/2, render);     // i/2 is a kludge...
 873                                 backbuffer += GetSDLScreenPitch() / 2;  // Convert bytes to words...
 874                         }
 875                 }
 876         }
 877 }
 878
 879 // Temp debugging stuff
 880
 881 void DumpMainMemory(void)
 882 {
 883         FILE * fp = fopen("./memdump.bin", "wb");
 884
 885         if (fp == NULL)
 886                 return;
 887
 888         fwrite(jaguar_mainRam, 1, 0x400000, fp);
 889         fclose(fp);
 890 }
 891
 892 uint8 * GetRamPtr(void)
 893 {
 894         return jaguar_mainRam;
 895 }