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 "m68kdasmAG.h"
  13
  14 #define CPU_DEBUG
  15 //Do this in makefile??? Yes! Could, but it's easier to define here...
  16 #define LOG_UNMAPPED_MEMORY_ACCESSES
  17 #define CPU_DEBUG_MEMORY
  18
  19 // Private function prototypes
  20
  21 unsigned jaguar_unknown_readbyte(unsigned address, uint32 who = UNKNOWN);
  22 unsigned jaguar_unknown_readword(unsigned address, uint32 who = UNKNOWN);
  23 void jaguar_unknown_writebyte(unsigned address, unsigned data, uint32 who = UNKNOWN);
  24 void jaguar_unknown_writeword(unsigned address, unsigned data, uint32 who = UNKNOWN);
  25 void M68K_show_context(void);
  26
  27 // External variables
  28
  29 extern bool hardwareTypeNTSC;                           // Set to false for PAL
  30 #ifdef CPU_DEBUG_MEMORY
  31 extern bool startMemLog;                                        // Set by "e" key
  32 extern int effect_start;
  33 extern int effect_start2, effect_start3, effect_start4, effect_start5, effect_start6;
  34 #endif
  35
  36 // Memory debugging identifiers
  37
  38 char * whoName[9] =
  39         { "Unknown", "Jaguar", "DSP", "GPU", "TOM", "JERRY", "M68K", "Blitter", "OP" };
  40
  41 // These values are overridden by command line switches...
  42
  43 bool dsp_enabled = false;
  44 bool jaguar_use_bios = true;                            // Default is now to USE the BIOS
  45 uint32 jaguar_active_memory_dumps = 0;
  46
  47 uint32 jaguar_mainRom_crc32;
  48
  49 /*static*/ uint8 * jaguar_mainRam = NULL;
  50 /*static*/ uint8 * jaguar_bootRom = NULL;
  51 /*static*/ uint8 * jaguar_mainRom = NULL;
  52 #ifdef CPU_DEBUG_MEMORY
  53 uint8 writeMemMax[0x400000], writeMemMin[0x400000];
  54 uint8 readMem[0x400000];
  55 uint32 returnAddr[4000], raPtr = 0xFFFFFFFF;
  56 #endif
  57
  58 //
  59 // Callback function to detect illegal instructions
  60 //
  61 //void GPUDumpDisassembly(void);
  62 //void GPUDumpRegisters(void);
  63 void M68KInstructionHook(void)
  64 {
  65         uint32 m68kPC = m68k_get_reg(NULL, M68K_REG_PC);
  66 /*      if (m68kPC == 0x8D0E48 && effect_start5)
  67         {
  68                 WriteLog("\nM68K: At collision detection code. Exiting!\n\n");
  69                 GPUDumpRegisters();
  70                 GPUDumpDisassembly();
  71                 log_done();
  72                 exit(0);
  73         }//*/
  74 /*      uint16 opcode = JaguarReadWord(m68kPC);
  75         if (opcode == 0x4E75)   // RTS
  76         {
  77                 if (startMemLog)
  78 //                      WriteLog("Jaguar: Returning from subroutine to %08X\n", JaguarReadLong(m68k_get_reg(NULL, M68K_REG_A7)));
  79                 {
  80                         uint32 addr = JaguarReadLong(m68k_get_reg(NULL, M68K_REG_A7));
  81                         bool found = false;
  82                         if (raPtr != 0xFFFFFFFF)
  83                         {
  84                                 for(uint32 i=0; i<=raPtr; i++)
  85                                 {
  86                                         if (returnAddr[i] == addr)
  87                                         {
  88                                                 found = true;
  89                                                 break;
  90                                         }
  91                                 }
  92                         }
  93
  94                         if (!found)
  95                                 returnAddr[++raPtr] = addr;
  96                 }
  97         }//*/
  98
  99 /*      static char buffer[2048];
 100         m68k_disassemble(buffer, m68kPC, M68K_CPU_TYPE_68000);
 101         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));//*/
 102
 103 /*      if (m68kPC == 0x803F16)
 104         {
 105                 WriteLog("M68K: Registers found at $803F16:\n");
 106                 WriteLog("\t68K PC=%06X\n", m68k_get_reg(NULL, M68K_REG_PC));
 107                 for(int i=M68K_REG_D0; i<=M68K_REG_D7; i++)
 108                         WriteLog("\tD%i = %08X\n", i-M68K_REG_D0, m68k_get_reg(NULL, (m68k_register_t)i));
 109                 WriteLog("\n");
 110                 for(int i=M68K_REG_A0; i<=M68K_REG_A7; i++)
 111                         WriteLog("\tA%i = %08X\n", i-M68K_REG_A0, m68k_get_reg(NULL, (m68k_register_t)i));
 112         }*/
 113
 114         if (!m68k_is_valid_instruction(m68k_read_memory_16(m68kPC), M68K_CPU_TYPE_68000))
 115         {
 116                 WriteLog("\nM68K encountered an illegal instruction at %08X!!!\n\nAborting!\n", m68kPC);
 117                 uint32 topOfStack = m68k_get_reg(NULL, M68K_REG_A7);
 118                 WriteLog("M68K: Top of stack: %08X. Stack trace:\n", JaguarReadLong(topOfStack));
 119                 for(int i=0; i<10; i++)
 120                         WriteLog("%06X: %08X\n", topOfStack - (i * 4), JaguarReadLong(topOfStack - (i * 4)));
 121                 WriteLog("Jaguar: VBL interrupt is %s\n", ((tom_irq_enabled(IRQ_VBLANK)) && (jaguar_interrupt_handler_is_valid(64))) ? "enabled" : "disabled");
 122                 M68K_show_context();
 123                 log_done();
 124                 exit(0);
 125         }
 126 }
 127
 128 //
 129 // Musashi 68000 read/write/IRQ functions
 130 //
 131
 132 int irq_ack_handler(int level)
 133 {
 134         int vector = M68K_INT_ACK_AUTOVECTOR;
 135
 136         // The GPU/DSP/etc are probably *not* issuing an NMI, but it seems to work OK...
 137
 138         if (level == 7)
 139         {
 140                 m68k_set_irq(0);                                                // Clear the IRQ...
 141                 vector = 64;                                                    // Set user interrupt #0
 142         }
 143
 144         return vector;
 145 }
 146
 147 unsigned int m68k_read_memory_8(unsigned int address)
 148 {
 149 #ifdef CPU_DEBUG_MEMORY
 150         if ((address >= 0x000000) && (address <= 0x3FFFFF))
 151         {
 152                 if (startMemLog)
 153                         readMem[address] = 1;
 154         }
 155 #endif
 156 //WriteLog("[RM8] Addr: %08X\n", address);
 157         unsigned int retVal = 0;
 158
 159         if ((address >= 0x000000) && (address <= 0x3FFFFF))
 160                 retVal = jaguar_mainRam[address];
 161         else if ((address >= 0x800000) && (address <= 0xDFFFFF))
 162                 retVal = jaguar_mainRom[address - 0x800000];
 163         else if ((address >= 0xE00000) && (address <= 0xE3FFFF))
 164                 retVal = jaguar_bootRom[address - 0xE00000];
 165         else if ((address >= 0xDFFF00) && (address <= 0xDFFFFF))
 166                 retVal = CDROMReadByte(address);
 167         else if ((address >= 0xF00000) && (address <= 0xF0FFFF))
 168                 retVal = TOMReadByte(address, M68K);
 169         else if ((address >= 0xF10000) && (address <= 0xF1FFFF))
 170                 retVal = JERRYReadByte(address, M68K);
 171         else
 172                 retVal = jaguar_unknown_readbyte(address, M68K);
 173
 174     return retVal;
 175 }
 176
 177 void gpu_dump_disassembly(void);
 178 void gpu_dump_registers(void);
 179
 180 unsigned int m68k_read_memory_16(unsigned int address)
 181 {
 182 #ifdef CPU_DEBUG_MEMORY
 183 /*      if ((address >= 0x000000) && (address <= 0x3FFFFE))
 184         {
 185                 if (startMemLog)
 186                         readMem[address] = 1, readMem[address + 1] = 1;
 187         }//*/
 188 /*      if (effect_start && (address >= 0x8064FC && address <= 0x806501))
 189         {
 190                 return 0x4E71;  // NOP
 191         }
 192         if (effect_start2 && (address >= 0x806502 && address <= 0x806507))
 193         {
 194                 return 0x4E71;  // NOP
 195         }
 196         if (effect_start3 && (address >= 0x806512 && address <= 0x806517))
 197         {
 198                 return 0x4E71;  // NOP
 199         }
 200         if (effect_start4 && (address >= 0x806524 && address <= 0x806527))
 201         {
 202                 return 0x4E71;  // NOP
 203         }
 204         if (effect_start5 && (address >= 0x80653E && address <= 0x806543)) //Collision detection!
 205         {
 206                 return 0x4E71;  // NOP
 207         }
 208         if (effect_start6 && (address >= 0x806544 && address <= 0x806547))
 209         {
 210                 return 0x4E71;  // NOP
 211         }//*/
 212 #endif
 213 //WriteLog("[RM16] Addr: %08X\n", address);
 214 /*if (m68k_get_reg(NULL, M68K_REG_PC) == 0x00005FBA)
 215 //      for(int i=0; i<10000; i++)
 216         WriteLog("[M68K] In routine #6!\n");//*/
 217 //if (m68k_get_reg(NULL, M68K_REG_PC) == 0x00006696) // GPU Program #4
 218 //if (m68k_get_reg(NULL, M68K_REG_PC) == 0x00005B3C)    // GPU Program #2
 219 /*if (m68k_get_reg(NULL, M68K_REG_PC) == 0x00005BA8)    // GPU Program #3
 220 {
 221         WriteLog("[M68K] About to run GPU! (Addr:%08X, data:%04X)\n", address, TOMReadWord(address));
 222         gpu_dump_registers();
 223         gpu_dump_disassembly();
 224 //      for(int i=0; i<10000; i++)
 225 //              WriteLog("[M68K] About to run GPU!\n");
 226 }//*/
 227 //WriteLog("[WM8  PC=%08X] Addr: %08X, val: %02X\n", m68k_get_reg(NULL, M68K_REG_PC), address, value);
 228 /*if (m68k_get_reg(NULL, M68K_REG_PC) >= 0x00006696 && m68k_get_reg(NULL, M68K_REG_PC) <= 0x000066A8)
 229 {
 230         if (address == 0x000066A0)
 231         {
 232                 gpu_dump_registers();
 233                 gpu_dump_disassembly();
 234         }
 235         for(int i=0; i<10000; i++)
 236                 WriteLog("[M68K] About to run GPU! (Addr:%08X, data:%04X)\n", address, TOMReadWord(address));
 237 }//*/
 238     unsigned int retVal = 0;
 239
 240         if ((address >= 0x000000) && (address <= 0x3FFFFE))
 241                 retVal = (jaguar_mainRam[address] << 8) | jaguar_mainRam[address+1];
 242         else if ((address >= 0x800000) && (address <= 0xDFFFFE))
 243                 retVal = (jaguar_mainRom[address - 0x800000] << 8) | jaguar_mainRom[address - 0x800000 + 1];
 244         else if ((address >= 0xE00000) && (address <= 0xE3FFFE))
 245                 retVal = (jaguar_bootRom[address - 0xE00000] << 8) | jaguar_bootRom[address - 0xE00000 + 1];
 246         else if ((address >= 0xDFFF00) && (address <= 0xDFFFFE))
 247                 retVal = CDROMReadWord(address, M68K);
 248         else if ((address >= 0xF00000) && (address <= 0xF0FFFE))
 249                 retVal = TOMReadWord(address, M68K);
 250         else if ((address >= 0xF10000) && (address <= 0xF1FFFE))
 251                 retVal = JERRYReadWord(address, M68K);
 252         else
 253                 retVal = jaguar_unknown_readword(address, M68K);
 254
 255     return retVal;
 256 }
 257
 258 unsigned int m68k_read_memory_32(unsigned int address)
 259 {
 260 //WriteLog("--> [RM32]\n");
 261     return (m68k_read_memory_16(address) << 16) | m68k_read_memory_16(address + 2);
 262 }
 263
 264 void m68k_write_memory_8(unsigned int address, unsigned int value)
 265 {
 266 #ifdef CPU_DEBUG_MEMORY
 267         if ((address >= 0x000000) && (address <= 0x3FFFFF))
 268         {
 269                 if (startMemLog)
 270                 {
 271                         if (value > writeMemMax[address])
 272                                 writeMemMax[address] = value;
 273                         if (value < writeMemMin[address])
 274                                 writeMemMin[address] = value;
 275                 }
 276         }
 277 #endif
 278 //if ((address >= 0x1FF020 && address <= 0x1FF03F) || (address >= 0x1FF820 && address <= 0x1FF83F))
 279 //      WriteLog("M68K: Writing %02X at %08X\n", value, address);
 280 //WriteLog("[WM8  PC=%08X] Addr: %08X, val: %02X\n", m68k_get_reg(NULL, M68K_REG_PC), address, value);
 281         if ((address >= 0x000000) && (address <= 0x3FFFFF))
 282                 jaguar_mainRam[address] = value;
 283         else if ((address >= 0xDFFF00) && (address <= 0xDFFFFF))
 284                 CDROMWriteByte(address, value, M68K);
 285         else if ((address >= 0xF00000) && (address <= 0xF0FFFF))
 286                 TOMWriteByte(address, value, M68K);
 287         else if ((address >= 0xF10000) && (address <= 0xF1FFFF))
 288                 JERRYWriteByte(address, value, M68K);
 289         else
 290                 jaguar_unknown_writebyte(address, value, M68K);
 291 }
 292
 293 void m68k_write_memory_16(unsigned int address, unsigned int value)
 294 {
 295 #ifdef CPU_DEBUG_MEMORY
 296         if ((address >= 0x000000) && (address <= 0x3FFFFE))
 297         {
 298                 if (startMemLog)
 299                 {
 300                         uint8 hi = value >> 8, lo = value & 0xFF;
 301
 302                         if (hi > writeMemMax[address])
 303                                 writeMemMax[address] = hi;
 304                         if (hi < writeMemMin[address])
 305                                 writeMemMin[address] = hi;
 306
 307                         if (lo > writeMemMax[address+1])
 308                                 writeMemMax[address+1] = lo;
 309                         if (lo < writeMemMin[address+1])
 310                                 writeMemMin[address+1] = lo;
 311                 }
 312         }
 313 #endif
 314 //if ((address >= 0x1FF020 && address <= 0x1FF03F) || (address >= 0x1FF820 && address <= 0x1FF83F))
 315 //      WriteLog("M68K: Writing %04X at %08X\n", value, address);
 316 //WriteLog("[WM16 PC=%08X] Addr: %08X, val: %04X\n", m68k_get_reg(NULL, M68K_REG_PC), address, value);
 317 //if (address >= 0xF02200 && address <= 0xF0229F)
 318 //      WriteLog("M68K: Writing to blitter --> %04X at %08X\n", value, address);
 319 //if (address >= 0x0E75D0 && address <= 0x0E75E7)
 320 //      WriteLog("M68K: Writing %04X at %08X, M68K PC=%08X\n", value, address, m68k_get_reg(NULL, M68K_REG_PC));
 321 /*extern uint32 totalFrames;
 322 if (address == 0xF02114)
 323         WriteLog("M68K: Writing to GPU_CTRL (frame:%u)... [M68K PC:%08X]\n", totalFrames, m68k_get_reg(NULL, M68K_REG_PC));
 324 if (address == 0xF02110)
 325         WriteLog("M68K: Writing to GPU_PC (frame:%u)... [M68K PC:%08X]\n", totalFrames, m68k_get_reg(NULL, M68K_REG_PC));//*/
 326 //if (address >= 0xF03B00 && address <= 0xF03DFF)
 327 //      WriteLog("M68K: Writing %04X to %08X...\n", value, address);
 328
 329         if ((address >= 0x000000) && (address <= 0x3FFFFE))
 330         {
 331 /*              jaguar_mainRam[address] = value >> 8;
 332                 jaguar_mainRam[address + 1] = value & 0xFF;*/
 333                 SET16(jaguar_mainRam, address, value);
 334         }
 335         else if ((address >= 0xDFFF00) && (address <= 0xDFFFFE))
 336                 CDROMWriteWord(address, value, M68K);
 337         else if ((address >= 0xF00000) && (address <= 0xF0FFFE))
 338                 TOMWriteWord(address, value, M68K);
 339         else if ((address >= 0xF10000) && (address <= 0xF1FFFE))
 340                 JERRYWriteWord(address, value, M68K);
 341         else
 342                 jaguar_unknown_writeword(address, value, M68K);
 343 }
 344
 345 void m68k_write_memory_32(unsigned int address, unsigned int value)
 346 {
 347 //WriteLog("--> [WM32]\n");
 348         m68k_write_memory_16(address, value >> 16);
 349         m68k_write_memory_16(address + 2, value & 0xFFFF);
 350 }
 351
 352
 353 uint32 jaguar_get_handler(uint32 i)
 354 {
 355         return JaguarReadLong(i * 4);
 356 }
 357
 358 uint32 jaguar_interrupt_handler_is_valid(uint32 i)
 359 {
 360         uint32 handler = jaguar_get_handler(i);
 361         if (handler && (handler != 0xFFFFFFFF))
 362                 return 1;
 363         else
 364                 return 0;
 365 }
 366
 367 void M68K_show_context(void)
 368 {
 369         WriteLog("\t68K PC=%06X\n", m68k_get_reg(NULL, M68K_REG_PC));
 370         for(int i=M68K_REG_D0; i<=M68K_REG_D7; i++)
 371                 WriteLog("\tD%i = %08X\n", i-M68K_REG_D0, m68k_get_reg(NULL, (m68k_register_t)i));
 372         WriteLog("\n");
 373         for(int i=M68K_REG_A0; i<=M68K_REG_A7; i++)
 374                 WriteLog("\tA%i = %08X\n", i-M68K_REG_A0, m68k_get_reg(NULL, (m68k_register_t)i));
 375
 376         WriteLog("68K disasm\n");
 377 //      jaguar_dasm(s68000readPC()-0x1000,0x20000);
 378         jaguar_dasm(m68k_get_reg(NULL, M68K_REG_PC) - 0x80, 0x200);
 379 //      jaguar_dasm(0x5000, 0x14414);
 380
 381         WriteLog("..................\n");
 382
 383         if (tom_irq_enabled(IRQ_VBLANK))
 384         {
 385                 WriteLog("vblank int: enabled\n");
 386                 jaguar_dasm(jaguar_get_handler(64), 0x200);
 387         }
 388         else
 389                 WriteLog("vblank int: disabled\n");
 390
 391         WriteLog("..................\n");
 392
 393         for(int i=0; i<256; i++)
 394                 WriteLog("handler %03i at $%08X\n", i, (unsigned int)jaguar_get_handler(i));
 395 }
 396
 397 //
 398 // Unknown read/write byte/word routines
 399 //
 400
 401 void jaguar_unknown_writebyte(unsigned address, unsigned data, uint32 who/*=UNKNOWN*/)
 402 {
 403 #ifdef LOG_UNMAPPED_MEMORY_ACCESSES
 404         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));
 405         extern bool finished;
 406         finished = true;
 407         extern bool doDSPDis;
 408         if (who == DSP)
 409                 doDSPDis = true;
 410 #endif
 411 }
 412
 413 void jaguar_unknown_writeword(unsigned address, unsigned data, uint32 who/*=UNKNOWN*/)
 414 {
 415 #ifdef LOG_UNMAPPED_MEMORY_ACCESSES
 416         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));
 417         extern bool finished;
 418         finished = true;
 419         extern bool doDSPDis;
 420         if (who == DSP)
 421                 doDSPDis = true;
 422 #endif
 423 }
 424
 425 unsigned jaguar_unknown_readbyte(unsigned address, uint32 who/*=UNKNOWN*/)
 426 {
 427 #ifdef LOG_UNMAPPED_MEMORY_ACCESSES
 428         WriteLog("Jaguar: Unknown byte read at %08X by %s (M68K PC=%06X)\n", address, whoName[who], m68k_get_reg(NULL, M68K_REG_PC));
 429         extern bool finished;
 430         finished = true;
 431         extern bool doDSPDis;
 432         if (who == DSP)
 433                 doDSPDis = true;
 434 #endif
 435     return 0xFF;
 436 }
 437
 438 unsigned jaguar_unknown_readword(unsigned address, uint32 who/*=UNKNOWN*/)
 439 {
 440 #ifdef LOG_UNMAPPED_MEMORY_ACCESSES
 441         WriteLog("Jaguar: Unknown word read at %08X by %s (M68K PC=%06X)\n", address, whoName[who], m68k_get_reg(NULL, M68K_REG_PC));
 442         extern bool finished;
 443         finished = true;
 444         extern bool doDSPDis;
 445         if (who == DSP)
 446                 doDSPDis = true;
 447 #endif
 448     return 0xFFFF;
 449 }
 450
 451 //
 452 // Disassemble M68K instructions at the given offset
 453 //
 454
 455 unsigned int m68k_read_disassembler_8(unsigned int address)
 456 {
 457         return m68k_read_memory_8(address);
 458 }
 459
 460 unsigned int m68k_read_disassembler_16(unsigned int address)
 461 {
 462         return m68k_read_memory_16(address);
 463 }
 464
 465 unsigned int m68k_read_disassembler_32(unsigned int address)
 466 {
 467         return m68k_read_memory_32(address);
 468 }
 469
 470 void jaguar_dasm(uint32 offset, uint32 qt)
 471 {
 472 #ifdef CPU_DEBUG
 473         static char buffer[2048];//, mem[64];
 474         int pc = offset, oldpc;
 475
 476         for(uint32 i=0; i<qt; i++)
 477         {
 478 /*              oldpc = pc;
 479                 for(int j=0; j<64; j++)
 480                         mem[j^0x01] = jaguar_byte_read(pc + j);
 481
 482                 pc += Dasm68000((char *)mem, buffer, 0);
 483                 WriteLog("%08X: %s\n", oldpc, buffer);//*/
 484                 oldpc = pc;
 485                 pc += m68k_disassemble(buffer, pc, M68K_CPU_TYPE_68000);
 486                 WriteLog("%08X: %s\n", oldpc, buffer);//*/
 487         }
 488 #endif
 489 }
 490
 491 uint8 JaguarReadByte(uint32 offset, uint32 who/*=UNKNOWN*/)
 492 {
 493         uint8 data = 0x00;
 494
 495         offset &= 0xFFFFFF;
 496         if (offset < 0x400000)
 497                 data = jaguar_mainRam[offset & 0x3FFFFF];
 498         else if ((offset >= 0x800000) && (offset < 0xC00000))
 499                 data = jaguar_mainRom[offset - 0x800000];
 500         else if ((offset >= 0xDFFF00) && (offset <= 0xDFFFFF))
 501                 data = CDROMReadByte(offset, who);
 502         else if ((offset >= 0xE00000) && (offset < 0xE40000))
 503                 data = jaguar_bootRom[offset & 0x3FFFF];
 504         else if ((offset >= 0xF00000) && (offset < 0xF10000))
 505                 data = TOMReadByte(offset, who);
 506         else if ((offset >= 0xF10000) && (offset < 0xF20000))
 507                 data = JERRYReadByte(offset, who);
 508         else
 509                 data = jaguar_unknown_readbyte(offset, who);
 510
 511         return data;
 512 }
 513
 514 uint16 JaguarReadWord(uint32 offset, uint32 who/*=UNKNOWN*/)
 515 {
 516         offset &= 0xFFFFFF;
 517         if (offset <= 0x3FFFFE)
 518         {
 519                 return (jaguar_mainRam[(offset+0) & 0x3FFFFF] << 8) | jaguar_mainRam[(offset+1) & 0x3FFFFF];
 520         }
 521         else if ((offset >= 0x800000) && (offset <= 0xBFFFFE))
 522         {
 523                 offset -= 0x800000;
 524                 return (jaguar_mainRom[offset+0] << 8) | jaguar_mainRom[offset+1];
 525         }
 526 //      else if ((offset >= 0xDFFF00) && (offset < 0xDFFF00))
 527         else if ((offset >= 0xDFFF00) && (offset <= 0xDFFFFE))
 528                 return CDROMReadWord(offset, who);
 529         else if ((offset >= 0xE00000) && (offset <= 0xE3FFFE))
 530                 return (jaguar_bootRom[(offset+0) & 0x3FFFF] << 8) | jaguar_bootRom[(offset+1) & 0x3FFFF];
 531         else if ((offset >= 0xF00000) && (offset <= 0xF0FFFE))
 532                 return TOMReadWord(offset, who);
 533         else if ((offset >= 0xF10000) && (offset <= 0xF1FFFE))
 534                 return JERRYReadWord(offset, who);
 535
 536         return jaguar_unknown_readword(offset, who);
 537 }
 538
 539 void JaguarWriteByte(uint32 offset, uint8 data, uint32 who/*=UNKNOWN*/)
 540 {
 541         offset &= 0xFFFFFF;
 542         if (offset < 0x400000)
 543         {
 544                 jaguar_mainRam[offset & 0x3FFFFF] = data;
 545                 return;
 546         }
 547         else if ((offset >= 0xDFFF00) && (offset <= 0xDFFFFF))
 548         {
 549                 CDROMWriteByte(offset, data, who);
 550                 return;
 551         }
 552         else if ((offset >= 0xF00000) && (offset <= 0xF0FFFF))
 553         {
 554                 TOMWriteByte(offset, data, who);
 555                 return;
 556         }
 557         else if ((offset >= 0xF10000) && (offset <= 0xF1FFFF))
 558         {
 559                 JERRYWriteByte(offset, data, who);
 560                 return;
 561         }
 562
 563         jaguar_unknown_writebyte(offset, data, who);
 564 }
 565
 566 void JaguarWriteWord(uint32 offset, uint16 data, uint32 who/*=UNKNOWN*/)
 567 {
 568 //TEMP--Mirror of F03000? Yes, but only 32-bit CPUs can do it (i.e., NOT the 68K!)
 569 //if (offset >= 0xF0B000 && offset <= 0xF0BFFF)
 570 //WriteLog("[JWW16] --> Possible GPU RAM mirror access! [%08X]", offset);
 571 //if ((offset >= 0x1FF020 && offset <= 0x1FF03F) || (offset >= 0x1FF820 && offset <= 0x1FF83F))
 572 //      WriteLog("JagWW: Writing %04X at %08X\n", data, offset);
 573         offset &= 0xFFFFFF;
 574
 575         if (offset <= 0x3FFFFE)
 576         {
 577                 jaguar_mainRam[(offset+0) & 0x3FFFFF] = (data>>8) & 0xFF;
 578                 jaguar_mainRam[(offset+1) & 0x3FFFFF] = data & 0xFF;
 579                 return;
 580         }
 581         else if ((offset >= 0xDFFF00) && (offset <= 0xDFFFFE))
 582         {
 583                 CDROMWriteWord(offset, data, who);
 584                 return;
 585         }
 586         else if ((offset >= 0xF00000) && (offset <= 0xF0FFFE))
 587         {
 588                 TOMWriteWord(offset, data, who);
 589                 return;
 590         }
 591         else if ((offset >= 0xF10000) && (offset <= 0xF1FFFE))
 592         {
 593                 JERRYWriteWord(offset, data, who);
 594                 return;
 595         }
 596
 597         jaguar_unknown_writeword(offset, data, who);
 598 }
 599
 600 // We really should re-do this so that it does *real* 32-bit access... !!! FIX !!!
 601 uint32 JaguarReadLong(uint32 offset, uint32 who/*=UNKNOWN*/)
 602 {
 603         return (JaguarReadWord(offset, who) << 16) | JaguarReadWord(offset+2, who);
 604 }
 605
 606 // We really should re-do this so that it does *real* 32-bit access... !!! FIX !!!
 607 void JaguarWriteLong(uint32 offset, uint32 data, uint32 who/*=UNKNOWN*/)
 608 {
 609         JaguarWriteWord(offset, data >> 16, who);
 610         JaguarWriteWord(offset+2, data & 0xFFFF, who);
 611 }
 612
 613 //
 614 // Jaguar console initialization
 615 //
 616 void jaguar_init(void)
 617 {
 618 #ifdef CPU_DEBUG_MEMORY
 619         memset(readMem, 0x00, 0x400000);
 620         memset(writeMemMin, 0xFF, 0x400000);
 621         memset(writeMemMax, 0x00, 0x400000);
 622 #endif
 623         memory_malloc_secure((void **)&jaguar_mainRam, 0x400000, "Jaguar 68K CPU RAM");
 624         memory_malloc_secure((void **)&jaguar_bootRom, 0x040000, "Jaguar 68K CPU BIOS ROM");
 625         memory_malloc_secure((void **)&jaguar_mainRom, 0x600000, "Jaguar 68K CPU ROM");
 626         memset(jaguar_mainRam, 0x00, 0x400000);
 627 //      memset(jaguar_mainRom, 0xFF, 0x200000); // & set it to all Fs...
 628         memset(jaguar_mainRom, 0x00, 0x200000); // & set it to all 0s...
 629
 630 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\Brain Dead 13.cdi");
 631 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\baldies.cdi");
 632 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\mystdemo.cdi");
 633 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\battlemorph.cdi");
 634 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\primalrage.cdi");
 635 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\Dragons Lair.cdi");
 636
 637         m68k_set_cpu_type(M68K_CPU_TYPE_68000);
 638         gpu_init();
 639         DSPInit();
 640         tom_init();
 641         jerry_init();
 642         cdrom_init();
 643 }
 644
 645 void jaguar_done(void)
 646 {
 647 #ifdef CPU_DEBUG_MEMORY
 648 /*      WriteLog("\n\nM68000 disassembly at $8D0D44 (collision routine!)...\n");
 649         jaguar_dasm(0x8D0D44, 5000);
 650         WriteLog("\n");//*/
 651 /*      WriteLog("\n\nM68000 disassembly at $806300 (look @ $806410)...\n");
 652         jaguar_dasm(0x806300, 5000);
 653         WriteLog("\n");//*/
 654
 655 /*      WriteLog("\nJaguar: Memory Usage Stats (return addresses)\n\n");
 656
 657         for(uint32 i=0; i<=raPtr; i++)
 658         {
 659                 WriteLog("\t%08X\n", returnAddr[i]);
 660                 WriteLog("M68000 disassembly at $%08X...\n", returnAddr[i] - 16);
 661                 jaguar_dasm(returnAddr[i] - 16, 16);
 662                 WriteLog("\n");
 663         }
 664         WriteLog("\n");//*/
 665
 666 /*      int start = 0, end = 0;
 667         bool endTriggered = false, startTriggered = false;
 668         for(int i=0; i<0x400000; i++)
 669         {
 670                 if (readMem[i] && writeMemMin[i] != 0xFF && writeMemMax != 0x00)
 671                 {
 672                         if (!startTriggered)
 673                                 startTriggered = true, endTriggered = false, start = i;
 674
 675                         WriteLog("\t\tMin/Max @ %06X: %u/%u\n", i, writeMemMin[i], writeMemMax[i]);
 676                 }
 677                 else
 678                 {
 679                         if (!endTriggered)
 680                         {
 681                                 end = i - 1, endTriggered = true, startTriggered = false;
 682                                 WriteLog("\tMemory range accessed: %06X - %06X\n", start, end);
 683                         }
 684                 }
 685         }
 686         WriteLog("\n");//*/
 687 #endif
 688 //#ifdef CPU_DEBUG
 689 //      for(int i=M68K_REG_A0; i<=M68K_REG_A7; i++)
 690 //              WriteLog("\tA%i = 0x%.8x\n", i-M68K_REG_A0, m68k_get_reg(NULL, (m68k_register_t)i));
 691         int32 topOfStack = m68k_get_reg(NULL, M68K_REG_A7);
 692         WriteLog("M68K: Top of stack: %08X. Stack trace:\n", JaguarReadLong(topOfStack));
 693         for(int i=-2; i<9; i++)
 694                 WriteLog("%06X: %08X\n", topOfStack + (i * 4), JaguarReadLong(topOfStack + (i * 4)));
 695
 696 /*      WriteLog("\nM68000 disassembly at $802288...\n");
 697         jaguar_dasm(0x802288, 3);
 698         WriteLog("\nM68000 disassembly at $802200...\n");
 699         jaguar_dasm(0x802200, 500);
 700         WriteLog("\nM68000 disassembly at $802518...\n");
 701         jaguar_dasm(0x802518, 100);//*/
 702
 703 /*      WriteLog("\n\nM68000 disassembly at $803F00 (look @ $803F2A)...\n");
 704         jaguar_dasm(0x803F00, 500);
 705         WriteLog("\n");//*/
 706
 707 /*      WriteLog("\n\nM68000 disassembly at $802B00 (look @ $802B5E)...\n");
 708         jaguar_dasm(0x802B00, 500);
 709         WriteLog("\n");//*/
 710
 711 /*      WriteLog("\n\nM68000 disassembly at $8099F8...\n");
 712         jaguar_dasm(0x809900, 500);
 713         WriteLog("\n");//*/
 714 //8099F8
 715
 716 //      WriteLog("Jaguar: CD BIOS version %04X\n", JaguarReadWord(0x3004));
 717         WriteLog("Jaguar: Interrupt enable = %02X\n", TOMReadByte(0xF000E1) & 0x1F);
 718         WriteLog("Jaguar: VBL interrupt is %s\n", ((tom_irq_enabled(IRQ_VBLANK)) && (jaguar_interrupt_handler_is_valid(64))) ? "enabled" : "disabled");
 719         M68K_show_context();
 720 //#endif
 721
 722         cd_bios_done();
 723         cdrom_done();
 724         gpu_done();
 725         DSPDone();
 726         tom_done();
 727         jerry_done();
 728
 729         memory_free(jaguar_mainRom);
 730         memory_free(jaguar_bootRom);
 731         memory_free(jaguar_mainRam);
 732 }
 733
 734 void jaguar_reset(void)
 735 {
 736         if (jaguar_use_bios)
 737                 memcpy(jaguar_mainRam, jaguar_bootRom, 8);
 738         else
 739         {
 740                 SET32(jaguar_mainRam, 4, 0x00802000);
 741                 // Handle PD stuff...
 742                 // This should definitely go elsewhere (like in the cart load section)!
 743                 if (jaguar_mainRom[0] == 0x60 && jaguar_mainRom[1] == 0x1A)
 744                 {
 745                         uint32 runAddress = GET32(jaguar_mainRom, 0x2A);
 746                         uint32 progLength = GET32(jaguar_mainRom, 0x02);
 747                         WriteLog("Setting up PD ROM... Run address: %08X, length: %08X\n", runAddress, progLength);
 748                         memcpy(jaguar_mainRam + runAddress, jaguar_mainRom + 0x2E, progLength);
 749                         SET32(jaguar_mainRam, 4, runAddress);
 750                 }
 751         }
 752
 753 //      WriteLog("jaguar_reset():\n");
 754 //#ifdef SOUND_OUTPUT
 755 //      ws_audio_reset();
 756 //#endif
 757         cd_bios_reset();
 758         tom_reset();
 759         jerry_reset();
 760         gpu_reset();
 761         DSPReset();
 762         cdrom_reset();
 763     m68k_pulse_reset();                         // Reset the 68000
 764         WriteLog("\t68K PC=%06X SP=%08X\n", m68k_get_reg(NULL, M68K_REG_PC), m68k_get_reg(NULL, M68K_REG_A7));
 765 }
 766
 767 //
 768 // Main Jaguar execution loop (1 frame)
 769 //
 770 void JaguarExecute(int16 * backbuffer, bool render)
 771 {
 772         uint16 vp = TOMReadWord(0xF0003E) + 1;//Hmm. This is a WO register. Will work? Looks like. But wrong behavior!
 773         uint16 vi = TOMReadWord(0xF0004E);//Another WO register...
 774         uint16 vdb = TOMReadWord(0xF00046);
 775 //Note: This is the *definite* end of the display, though VDE *might* be less than this...
 776 //      uint16 vbb = TOMReadWord(0xF00040);
 777 //It seems that they mean it when they say that VDE is the end of object processing.
 778 //However, we need to be able to tell the OP (or TOM) that we've reached the end of the
 779 //buffer and not to write any more pixels... !!! FIX !!!
 780         uint16 vde = TOMReadWord(0xF00048);
 781
 782         uint16 refreshRate = (hardwareTypeNTSC ? 60 : 50);
 783         // Should these be hardwired or read from VP? Yes, from VP!
 784         uint32 M68KCyclesPerScanline
 785                 = (hardwareTypeNTSC ? M68K_CLOCK_RATE_NTSC : M68K_CLOCK_RATE_PAL) / (vp * refreshRate);
 786         uint32 RISCCyclesPerScanline
 787                 = (hardwareTypeNTSC ? RISC_CLOCK_RATE_NTSC : RISC_CLOCK_RATE_PAL) / (vp * refreshRate);
 788
 789 /*extern int effect_start;
 790 if (effect_start)
 791 {
 792         WriteLog("JagExe: VP=%u, VI=%u, VDB=%u, VBB=%u CPU CPS=%u, GPU CPS=%u\n", vp, vi, vdb, vbb, M68KCyclesPerScanline, RISCCyclesPerScanline);
 793 }//*/
 794
 795         for(uint16 i=0; i<vp; i++)
 796         {
 797                 // Increment the horizontal count (why? RNG?)
 798                 TOMWriteWord(0xF00004, (TOMReadWord(0xF00004) + 1) & 0x7FF);
 799
 800                 TOMWriteWord(0xF00006, i);                                      // Write the VC
 801
 802                 if (i == vi)                                                            // Time for Vertical Interrupt?
 803                 {
 804                         if (tom_irq_enabled(IRQ_VBLANK))// && jaguar_interrupt_handler_is_valid(64))
 805                         {
 806                                 // We don't have to worry about autovectors & whatnot because the Jaguar
 807                                 // tells you through its HW registers who sent the interrupt...
 808                                 tom_set_pending_video_int();
 809                                 m68k_set_irq(7);
 810                         }
 811                 }
 812
 813 //              uint32 invalid_instruction_address = s68000exec(M68KCyclesPerScanline);
 814 //              if (invalid_instruction_address != 0x80000000)
 815 //                      cd_bios_process(invalid_instruction_address);
 816                 m68k_execute(M68KCyclesPerScanline);
 817                 // No CD handling... !!! FIX !!!
 818                 cd_bios_exec(i);        // NOTE: Ignores parameter...
 819                 tom_pit_exec(RISCCyclesPerScanline);
 820                 jerry_pit_exec(RISCCyclesPerScanline);
 821                 jerry_i2s_exec(RISCCyclesPerScanline);
 822                 gpu_exec(RISCCyclesPerScanline);
 823                 if (dsp_enabled)
 824                         DSPExec(RISCCyclesPerScanline);
 825
 826 //Interlacing is still not handled correctly here... !!! FIX !!!
 827                 if (i >= vdb && i < vde)//vbb)
 828                 {
 829                         if (!(i & 0x01))                                                // Execute OP only on even lines (non-interlaced only!)
 830                         {
 831                                 tom_exec_scanline(backbuffer, i/2, render);     // i/2 is a kludge...
 832                                 backbuffer += TOMGetSDLScreenPitch() / 2;       // Convert bytes to words...
 833                         }
 834                 }
 835         }
 836 }
 837
 838 // Temp debugging stuff
 839
 840 void DumpMainMemory(void)
 841 {
 842         FILE * fp = fopen("./memdump.bin", "wb");
 843
 844         if (fp == NULL)
 845                 return;
 846
 847         fwrite(jaguar_mainRam, 1, 0x400000, fp);
 848         fclose(fp);
 849 }
 850
 851 uint8 * GetRamPtr(void)
 852 {
 853         return jaguar_mainRam;
 854 }