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
  18 // Private function prototypes
  19
  20 unsigned jaguar_unknown_readbyte(unsigned address, uint32 who = UNKNOWN);
  21 unsigned jaguar_unknown_readword(unsigned address, uint32 who = UNKNOWN);
  22 void jaguar_unknown_writebyte(unsigned address, unsigned data, uint32 who = UNKNOWN);
  23 void jaguar_unknown_writeword(unsigned address, unsigned data, uint32 who = UNKNOWN);
  24 void M68K_show_context(void);
  25
  26 // External variables
  27
  28 extern bool hardwareTypeNTSC;                           // Set to false for PAL
  29
  30 // Memory debugging identifiers
  31
  32 char * whoName[9] =
  33         { "Unknown", "Jaguar", "DSP", "GPU", "TOM", "JERRY", "M68K", "Blitter", "OP" };
  34
  35 // These values are overridden by command line switches...
  36
  37 bool dsp_enabled = false;
  38 bool jaguar_use_bios = true;                            // Default is now to USE the BIOS
  39 uint32 jaguar_active_memory_dumps = 0;
  40
  41 uint32 jaguar_mainRom_crc32;
  42
  43 static uint32 m68k_cycles_per_scanline;
  44 static uint32 gpu_cycles_per_scanline;
  45 static uint32 dsp_cycles_per_scanline;
  46 static uint32 jaguar_screen_scanlines;
  47
  48 /*static*/ uint8 * jaguar_mainRam = NULL;
  49 /*static*/ uint8 * jaguar_bootRom = NULL;
  50 /*static*/ uint8 * jaguar_mainRom = NULL;
  51
  52
  53 //
  54 // Callback function to detect illegal instructions
  55 //
  56 void M68KInstructionHook(void)
  57 {
  58         uint32 m68kPC = m68k_get_reg(NULL, M68K_REG_PC);
  59
  60 /*      static char buffer[2048];
  61         m68k_disassemble(buffer, m68kPC, M68K_CPU_TYPE_68000);
  62         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));//*/
  63
  64 /*      if (m68kPC == 0x803F16)
  65         {
  66                 WriteLog("M68K: Registers found at $803F16:\n");
  67                 WriteLog("\t68K PC=%06X\n", m68k_get_reg(NULL, M68K_REG_PC));
  68                 for(int i=M68K_REG_D0; i<=M68K_REG_D7; i++)
  69                         WriteLog("\tD%i = %08X\n", i-M68K_REG_D0, m68k_get_reg(NULL, (m68k_register_t)i));
  70                 WriteLog("\n");
  71                 for(int i=M68K_REG_A0; i<=M68K_REG_A7; i++)
  72                         WriteLog("\tA%i = %08X\n", i-M68K_REG_A0, m68k_get_reg(NULL, (m68k_register_t)i));
  73         }*/
  74
  75         if (!m68k_is_valid_instruction(JaguarReadWord(m68kPC), M68K_CPU_TYPE_68000))
  76         {
  77                 WriteLog("\nM68K encountered an illegal instruction at %08X!!!\n\nAborting!\n", m68kPC);
  78                 uint32 topOfStack = m68k_get_reg(NULL, M68K_REG_A7);
  79                 WriteLog("M68K: Top of stack: %08X. Stack trace:\n", JaguarReadLong(topOfStack));
  80                 for(int i=0; i<10; i++)
  81                         WriteLog("%06X: %08X\n", topOfStack - (i * 4), JaguarReadLong(topOfStack - (i * 4)));
  82                 WriteLog("Jaguar: VBL interrupt is %s\n", ((tom_irq_enabled(IRQ_VBLANK)) && (jaguar_interrupt_handler_is_valid(64))) ? "enabled" : "disabled");
  83                 M68K_show_context();
  84                 log_done();
  85                 exit(0);
  86         }
  87 }
  88
  89 //
  90 // Musashi 68000 read/write/IRQ functions
  91 //
  92
  93 int irq_ack_handler(int level)
  94 {
  95         int vector = M68K_INT_ACK_AUTOVECTOR;
  96
  97         // The GPU/DSP/etc are probably *not* issuing an NMI, but it seems to work OK...
  98
  99         if (level == 7)
 100         {
 101                 m68k_set_irq(0);                                                // Clear the IRQ...
 102                 vector = 64;                                                    // Set user interrupt #0
 103         }
 104
 105         return vector;
 106 }
 107
 108 unsigned int m68k_read_memory_8(unsigned int address)
 109 {
 110 //WriteLog("[RM8] Addr: %08X\n", address);
 111         unsigned int retVal = 0;
 112
 113         if ((address >= 0x000000) && (address <= 0x3FFFFF))
 114                 retVal = jaguar_mainRam[address];
 115         else if ((address >= 0x800000) && (address <= 0xDFFFFF))
 116                 retVal = jaguar_mainRom[address - 0x800000];
 117         else if ((address >= 0xE00000) && (address <= 0xE3FFFF))
 118                 retVal = jaguar_bootRom[address - 0xE00000];
 119         else if ((address >= 0xDFFF00) && (address <= 0xDFFFFF))
 120                 retVal = CDROMReadByte(address);
 121         else if ((address >= 0xF00000) && (address <= 0xF0FFFF))
 122                 retVal = TOMReadByte(address, M68K);
 123         else if ((address >= 0xF10000) && (address <= 0xF1FFFF))
 124                 retVal = JERRYReadByte(address, M68K);
 125         else
 126                 retVal = jaguar_unknown_readbyte(address, M68K);
 127
 128     return retVal;
 129 }
 130
 131 void gpu_dump_disassembly(void);
 132 void gpu_dump_registers(void);
 133
 134 unsigned int m68k_read_memory_16(unsigned int address)
 135 {
 136 //WriteLog("[RM16] Addr: %08X\n", address);
 137 /*if (m68k_get_reg(NULL, M68K_REG_PC) == 0x00005FBA)
 138 //      for(int i=0; i<10000; i++)
 139         WriteLog("[M68K] In routine #6!\n");//*/
 140 //if (m68k_get_reg(NULL, M68K_REG_PC) == 0x00006696) // GPU Program #4
 141 //if (m68k_get_reg(NULL, M68K_REG_PC) == 0x00005B3C)    // GPU Program #2
 142 /*if (m68k_get_reg(NULL, M68K_REG_PC) == 0x00005BA8)    // GPU Program #3
 143 {
 144         WriteLog("[M68K] About to run GPU! (Addr:%08X, data:%04X)\n", address, TOMReadWord(address));
 145         gpu_dump_registers();
 146         gpu_dump_disassembly();
 147 //      for(int i=0; i<10000; i++)
 148 //              WriteLog("[M68K] About to run GPU!\n");
 149 }//*/
 150 //WriteLog("[WM8  PC=%08X] Addr: %08X, val: %02X\n", m68k_get_reg(NULL, M68K_REG_PC), address, value);
 151 /*if (m68k_get_reg(NULL, M68K_REG_PC) >= 0x00006696 && m68k_get_reg(NULL, M68K_REG_PC) <= 0x000066A8)
 152 {
 153         if (address == 0x000066A0)
 154         {
 155                 gpu_dump_registers();
 156                 gpu_dump_disassembly();
 157         }
 158         for(int i=0; i<10000; i++)
 159                 WriteLog("[M68K] About to run GPU! (Addr:%08X, data:%04X)\n", address, TOMReadWord(address));
 160 }//*/
 161     unsigned int retVal = 0;
 162
 163         if ((address >= 0x000000) && (address <= 0x3FFFFE))
 164                 retVal = (jaguar_mainRam[address] << 8) | jaguar_mainRam[address+1];
 165         else if ((address >= 0x800000) && (address <= 0xDFFFFE))
 166                 retVal = (jaguar_mainRom[address - 0x800000] << 8) | jaguar_mainRom[address - 0x800000 + 1];
 167         else if ((address >= 0xE00000) && (address <= 0xE3FFFE))
 168                 retVal = (jaguar_bootRom[address - 0xE00000] << 8) | jaguar_bootRom[address - 0xE00000 + 1];
 169         else if ((address >= 0xDFFF00) && (address <= 0xDFFFFE))
 170                 retVal = CDROMReadWord(address, M68K);
 171         else if ((address >= 0xF00000) && (address <= 0xF0FFFE))
 172                 retVal = TOMReadWord(address, M68K);
 173         else if ((address >= 0xF10000) && (address <= 0xF1FFFE))
 174                 retVal = JERRYReadWord(address, M68K);
 175         else
 176                 retVal = jaguar_unknown_readword(address, M68K);
 177
 178     return retVal;
 179 }
 180
 181 unsigned int m68k_read_memory_32(unsigned int address)
 182 {
 183 //WriteLog("--> [RM32]\n");
 184     return (m68k_read_memory_16(address) << 16) | m68k_read_memory_16(address + 2);
 185 }
 186
 187 void m68k_write_memory_8(unsigned int address, unsigned int value)
 188 {
 189 //if ((address >= 0x1FF020 && address <= 0x1FF03F) || (address >= 0x1FF820 && address <= 0x1FF83F))
 190 //      WriteLog("M68K: Writing %02X at %08X\n", value, address);
 191 //WriteLog("[WM8  PC=%08X] Addr: %08X, val: %02X\n", m68k_get_reg(NULL, M68K_REG_PC), address, value);
 192         if ((address >= 0x000000) && (address <= 0x3FFFFF))
 193                 jaguar_mainRam[address] = value;
 194         else if ((address >= 0xDFFF00) && (address <= 0xDFFFFF))
 195                 CDROMWriteByte(address, value, M68K);
 196         else if ((address >= 0xF00000) && (address <= 0xF0FFFF))
 197                 TOMWriteByte(address, value, M68K);
 198         else if ((address >= 0xF10000) && (address <= 0xF1FFFF))
 199                 JERRYWriteByte(address, value, M68K);
 200         else
 201                 jaguar_unknown_writebyte(address, value, M68K);
 202 }
 203
 204 void m68k_write_memory_16(unsigned int address, unsigned int value)
 205 {
 206 //if ((address >= 0x1FF020 && address <= 0x1FF03F) || (address >= 0x1FF820 && address <= 0x1FF83F))
 207 //      WriteLog("M68K: Writing %04X at %08X\n", value, address);
 208 //WriteLog("[WM16 PC=%08X] Addr: %08X, val: %04X\n", m68k_get_reg(NULL, M68K_REG_PC), address, value);
 209 //if (address >= 0xF02200 && address <= 0xF0229F)
 210 //      WriteLog("M68K: Writing to blitter --> %04X at %08X\n", value, address);
 211 //if (address >= 0x0E75D0 && address <= 0x0E75E7)
 212 //      WriteLog("M68K: Writing %04X at %08X, M68K PC=%08X\n", value, address, m68k_get_reg(NULL, M68K_REG_PC));
 213 /*extern uint32 totalFrames;
 214 extern bool suppressOutput;
 215 if (totalFrames >= 59)
 216         suppressOutput = false;//*/
 217 /*if (address == 0xF02114)
 218         WriteLog("M68K: Writing to GPU_CTRL (frame:%u)... [M68K PC:%08X]\n", totalFrames, m68k_get_reg(NULL, M68K_REG_PC));
 219 if (address == 0xF02110)
 220         WriteLog("M68K: Writing to GPU_PC (frame:%u)... [M68K PC:%08X]\n", totalFrames, m68k_get_reg(NULL, M68K_REG_PC));//*/
 221 //if (address >= 0xF03B00 && address <= 0xF03DFF)
 222 //      WriteLog("M68K: Writing %04X to %08X...\n", value, address);
 223
 224         if ((address >= 0x000000) && (address <= 0x3FFFFE))
 225         {
 226 /*              jaguar_mainRam[address] = value >> 8;
 227                 jaguar_mainRam[address + 1] = value & 0xFF;*/
 228                 SET16(jaguar_mainRam, address, value);
 229         }
 230         else if ((address >= 0xDFFF00) && (address <= 0xDFFFFE))
 231                 CDROMWriteWord(address, value, M68K);
 232         else if ((address >= 0xF00000) && (address <= 0xF0FFFE))
 233                 TOMWriteWord(address, value, M68K);
 234         else if ((address >= 0xF10000) && (address <= 0xF1FFFE))
 235                 JERRYWriteWord(address, value, M68K);
 236         else
 237                 jaguar_unknown_writeword(address, value, M68K);
 238 }
 239
 240 void m68k_write_memory_32(unsigned int address, unsigned int value)
 241 {
 242 //WriteLog("--> [WM32]\n");
 243         m68k_write_memory_16(address, value >> 16);
 244         m68k_write_memory_16(address + 2, value & 0xFFFF);
 245 }
 246
 247
 248 uint32 jaguar_get_handler(uint32 i)
 249 {
 250         return JaguarReadLong(i * 4);
 251 }
 252
 253 uint32 jaguar_interrupt_handler_is_valid(uint32 i)
 254 {
 255         uint32 handler = jaguar_get_handler(i);
 256         if (handler && (handler != 0xFFFFFFFF))
 257                 return 1;
 258         else
 259                 return 0;
 260 }
 261
 262 void M68K_show_context(void)
 263 {
 264         WriteLog("\t68K PC=%06X\n", m68k_get_reg(NULL, M68K_REG_PC));
 265         for(int i=M68K_REG_D0; i<=M68K_REG_D7; i++)
 266                 WriteLog("\tD%i = %08X\n", i-M68K_REG_D0, m68k_get_reg(NULL, (m68k_register_t)i));
 267         WriteLog("\n");
 268         for(int i=M68K_REG_A0; i<=M68K_REG_A7; i++)
 269                 WriteLog("\tA%i = %08X\n", i-M68K_REG_A0, m68k_get_reg(NULL, (m68k_register_t)i));
 270
 271         WriteLog("68K disasm\n");
 272 //      jaguar_dasm(s68000readPC()-0x1000,0x20000);
 273         jaguar_dasm(m68k_get_reg(NULL, M68K_REG_PC) - 0x80, 0x200);
 274 //      jaguar_dasm(0x5000, 0x14414);
 275
 276         WriteLog("..................\n");
 277
 278         if (tom_irq_enabled(IRQ_VBLANK))
 279         {
 280                 WriteLog("vblank int: enabled\n");
 281                 jaguar_dasm(jaguar_get_handler(64), 0x200);
 282         }
 283         else
 284                 WriteLog("vblank int: disabled\n");
 285
 286         WriteLog("..................\n");
 287
 288         for(int i=0; i<256; i++)
 289                 WriteLog("handler %03i at $%08X\n", i, (unsigned int)jaguar_get_handler(i));
 290 }
 291
 292 //
 293 // Unknown read/write byte/word routines
 294 //
 295
 296 void jaguar_unknown_writebyte(unsigned address, unsigned data, uint32 who/*=UNKNOWN*/)
 297 {
 298 #ifdef LOG_UNMAPPED_MEMORY_ACCESSES
 299         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));
 300         extern bool finished;
 301         finished = true;
 302         extern bool doDSPDis;
 303         if (who == DSP)
 304                 doDSPDis = true;
 305 #endif
 306 }
 307
 308 void jaguar_unknown_writeword(unsigned address, unsigned data, uint32 who/*=UNKNOWN*/)
 309 {
 310 #ifdef LOG_UNMAPPED_MEMORY_ACCESSES
 311         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));
 312         extern bool finished;
 313         finished = true;
 314         extern bool doDSPDis;
 315         if (who == DSP)
 316                 doDSPDis = true;
 317 #endif
 318 }
 319
 320 unsigned jaguar_unknown_readbyte(unsigned address, uint32 who/*=UNKNOWN*/)
 321 {
 322 #ifdef LOG_UNMAPPED_MEMORY_ACCESSES
 323         WriteLog("Jaguar: Unknown byte read at %08X by %s (M68K PC=%06X)\n", address, whoName[who], m68k_get_reg(NULL, M68K_REG_PC));
 324         extern bool finished;
 325         finished = true;
 326         extern bool doDSPDis;
 327         if (who == DSP)
 328                 doDSPDis = true;
 329 #endif
 330     return 0xFF;
 331 }
 332
 333 unsigned jaguar_unknown_readword(unsigned address, uint32 who/*=UNKNOWN*/)
 334 {
 335 #ifdef LOG_UNMAPPED_MEMORY_ACCESSES
 336         WriteLog("Jaguar: Unknown word read at %08X by %s (M68K PC=%06X)\n", address, whoName[who], m68k_get_reg(NULL, M68K_REG_PC));
 337         extern bool finished;
 338         finished = true;
 339         extern bool doDSPDis;
 340         if (who == DSP)
 341                 doDSPDis = true;
 342 #endif
 343     return 0xFFFF;
 344 }
 345
 346 //
 347 // Disassemble M68K instructions at the given offset
 348 //
 349
 350 unsigned int m68k_read_disassembler_8(unsigned int address)
 351 {
 352         return m68k_read_memory_8(address);
 353 }
 354
 355 unsigned int m68k_read_disassembler_16(unsigned int address)
 356 {
 357         return m68k_read_memory_16(address);
 358 }
 359
 360 unsigned int m68k_read_disassembler_32(unsigned int address)
 361 {
 362         return m68k_read_memory_32(address);
 363 }
 364
 365 void jaguar_dasm(uint32 offset, uint32 qt)
 366 {
 367 #ifdef CPU_DEBUG
 368         static char buffer[2048];//, mem[64];
 369         int pc = offset, oldpc;
 370
 371         for(uint32 i=0; i<qt; i++)
 372         {
 373 /*              oldpc = pc;
 374                 for(int j=0; j<64; j++)
 375                         mem[j^0x01] = jaguar_byte_read(pc + j);
 376
 377                 pc += Dasm68000((char *)mem, buffer, 0);
 378                 WriteLog("%08X: %s\n", oldpc, buffer);//*/
 379                 oldpc = pc;
 380                 pc += m68k_disassemble(buffer, pc, M68K_CPU_TYPE_68000);
 381                 WriteLog("%08X: %s\n", oldpc, buffer);//*/
 382         }
 383 #endif
 384 }
 385
 386 uint8 JaguarReadByte(uint32 offset, uint32 who/*=UNKNOWN*/)
 387 {
 388         uint8 data = 0x00;
 389
 390         offset &= 0xFFFFFF;
 391         if (offset < 0x400000)
 392                 data = jaguar_mainRam[offset & 0x3FFFFF];
 393         else if ((offset >= 0x800000) && (offset < 0xC00000))
 394                 data = jaguar_mainRom[offset - 0x800000];
 395         else if ((offset >= 0xDFFF00) && (offset <= 0xDFFFFF))
 396                 data = CDROMReadByte(offset, who);
 397         else if ((offset >= 0xE00000) && (offset < 0xE40000))
 398                 data = jaguar_bootRom[offset & 0x3FFFF];
 399         else if ((offset >= 0xF00000) && (offset < 0xF10000))
 400                 data = TOMReadByte(offset, who);
 401         else if ((offset >= 0xF10000) && (offset < 0xF20000))
 402                 data = JERRYReadByte(offset, who);
 403         else
 404                 data = jaguar_unknown_readbyte(offset, who);
 405
 406         return data;
 407 }
 408
 409 uint16 JaguarReadWord(uint32 offset, uint32 who/*=UNKNOWN*/)
 410 {
 411         offset &= 0xFFFFFF;
 412         if (offset <= 0x3FFFFE)
 413         {
 414                 return (jaguar_mainRam[(offset+0) & 0x3FFFFF] << 8) | jaguar_mainRam[(offset+1) & 0x3FFFFF];
 415         }
 416         else if ((offset >= 0x800000) && (offset <= 0xBFFFFE))
 417         {
 418                 offset -= 0x800000;
 419                 return (jaguar_mainRom[offset+0] << 8) | jaguar_mainRom[offset+1];
 420         }
 421 //      else if ((offset >= 0xDFFF00) && (offset < 0xDFFF00))
 422         else if ((offset >= 0xDFFF00) && (offset <= 0xDFFFFE))
 423                 return CDROMReadWord(offset, who);
 424         else if ((offset >= 0xE00000) && (offset <= 0xE3FFFE))
 425                 return (jaguar_bootRom[(offset+0) & 0x3FFFF] << 8) | jaguar_bootRom[(offset+1) & 0x3FFFF];
 426         else if ((offset >= 0xF00000) && (offset <= 0xF0FFFE))
 427                 return TOMReadWord(offset, who);
 428         else if ((offset >= 0xF10000) && (offset <= 0xF1FFFE))
 429                 return JERRYReadWord(offset, who);
 430
 431         return jaguar_unknown_readword(offset, who);
 432 }
 433
 434 void JaguarWriteByte(uint32 offset, uint8 data, uint32 who/*=UNKNOWN*/)
 435 {
 436         offset &= 0xFFFFFF;
 437         if (offset < 0x400000)
 438         {
 439                 jaguar_mainRam[offset & 0x3FFFFF] = data;
 440                 return;
 441         }
 442         else if ((offset >= 0xDFFF00) && (offset <= 0xDFFFFF))
 443         {
 444                 CDROMWriteByte(offset, data, who);
 445                 return;
 446         }
 447         else if ((offset >= 0xF00000) && (offset <= 0xF0FFFF))
 448         {
 449                 TOMWriteByte(offset, data, who);
 450                 return;
 451         }
 452         else if ((offset >= 0xF10000) && (offset <= 0xF1FFFF))
 453         {
 454                 JERRYWriteByte(offset, data, who);
 455                 return;
 456         }
 457
 458         jaguar_unknown_writebyte(offset, data, who);
 459 }
 460
 461 void JaguarWriteWord(uint32 offset, uint16 data, uint32 who/*=UNKNOWN*/)
 462 {
 463 //TEMP--Mirror of F03000? Yes, but only 32-bit CPUs can do it (i.e., NOT the 68K!)
 464 //if (offset >= 0xF0B000 && offset <= 0xF0BFFF)
 465 //WriteLog("[JWW16] --> Possible GPU RAM mirror access! [%08X]", offset);
 466 //if ((offset >= 0x1FF020 && offset <= 0x1FF03F) || (offset >= 0x1FF820 && offset <= 0x1FF83F))
 467 //      WriteLog("JagWW: Writing %04X at %08X\n", data, offset);
 468         offset &= 0xFFFFFF;
 469
 470         if (offset <= 0x3FFFFE)
 471         {
 472                 jaguar_mainRam[(offset+0) & 0x3FFFFF] = (data>>8) & 0xFF;
 473                 jaguar_mainRam[(offset+1) & 0x3FFFFF] = data & 0xFF;
 474                 return;
 475         }
 476         else if ((offset >= 0xDFFF00) && (offset <= 0xDFFFFE))
 477         {
 478                 CDROMWriteWord(offset, data, who);
 479                 return;
 480         }
 481         else if ((offset >= 0xF00000) && (offset <= 0xF0FFFE))
 482         {
 483                 TOMWriteWord(offset, data, who);
 484                 return;
 485         }
 486         else if ((offset >= 0xF10000) && (offset <= 0xF1FFFE))
 487         {
 488                 JERRYWriteWord(offset, data, who);
 489                 return;
 490         }
 491
 492         jaguar_unknown_writeword(offset, data, who);
 493 }
 494
 495 // We really should re-do this so that it does *real* 32-bit access... !!! FIX !!!
 496 uint32 JaguarReadLong(uint32 offset, uint32 who/*=UNKNOWN*/)
 497 {
 498         return (JaguarReadWord(offset, who) << 16) | JaguarReadWord(offset+2, who);
 499 }
 500
 501 // We really should re-do this so that it does *real* 32-bit access... !!! FIX !!!
 502 void JaguarWriteLong(uint32 offset, uint32 data, uint32 who/*=UNKNOWN*/)
 503 {
 504         JaguarWriteWord(offset, data >> 16, who);
 505         JaguarWriteWord(offset+2, data & 0xFFFF, who);
 506 }
 507
 508 //
 509 // Jaguar console initialization
 510 //
 511 void jaguar_init(void)
 512 {
 513         memory_malloc_secure((void **)&jaguar_mainRam, 0x400000, "Jaguar 68K CPU RAM");
 514         memory_malloc_secure((void **)&jaguar_bootRom, 0x040000, "Jaguar 68K CPU BIOS ROM");
 515         memory_malloc_secure((void **)&jaguar_mainRom, 0x600000, "Jaguar 68K CPU ROM");
 516         memset(jaguar_mainRam, 0x00, 0x400000);
 517 //      memset(jaguar_mainRom, 0xFF, 0x200000); // & set it to all Fs...
 518         memset(jaguar_mainRom, 0x00, 0x200000); // & set it to all 0s...
 519
 520 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\Brain Dead 13.cdi");
 521 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\baldies.cdi");
 522 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\mystdemo.cdi");
 523 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\battlemorph.cdi");
 524 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\primalrage.cdi");
 525 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\Dragons Lair.cdi");
 526
 527         // Should these be hardwired or read from VP?
 528         jaguar_screen_scanlines = (hardwareTypeNTSC ? 524 : 624);
 529 //Should the divisor be 50 for PAL??? Let's try it!
 530         m68k_cycles_per_scanline = (hardwareTypeNTSC ? M68K_CLOCK_RATE_NTSC : M68K_CLOCK_RATE_PAL) / (jaguar_screen_scanlines * (hardwareTypeNTSC ? 60 : 50));
 531         gpu_cycles_per_scanline = dsp_cycles_per_scanline
 532                 = (hardwareTypeNTSC ? RISC_CLOCK_RATE_NTSC : RISC_CLOCK_RATE_PAL) / (jaguar_screen_scanlines * (hardwareTypeNTSC ? 60 : 50));
 533
 534 //#ifdef SOUND_OUTPUT
 535 //      ws_audio_init();
 536 //#endif
 537
 538         m68k_set_cpu_type(M68K_CPU_TYPE_68000);
 539         gpu_init();
 540         DSPInit();
 541         tom_init();
 542         jerry_init();
 543         cdrom_init();
 544 }
 545
 546 void jaguar_done(void)
 547 {
 548 //#ifdef CPU_DEBUG
 549 //      for(int i=M68K_REG_A0; i<=M68K_REG_A7; i++)
 550 //              WriteLog("\tA%i = 0x%.8x\n", i-M68K_REG_A0, m68k_get_reg(NULL, (m68k_register_t)i));
 551         int32 topOfStack = m68k_get_reg(NULL, M68K_REG_A7);
 552         WriteLog("M68K: Top of stack: %08X. Stack trace:\n", JaguarReadLong(topOfStack));
 553         for(int i=-2; i<9; i++)
 554                 WriteLog("%06X: %08X\n", topOfStack + (i * 4), JaguarReadLong(topOfStack + (i * 4)));
 555
 556 /*      WriteLog("\nM68000 disassembly at $802288...\n");
 557         jaguar_dasm(0x802288, 3);
 558         WriteLog("\nM68000 disassembly at $802200...\n");
 559         jaguar_dasm(0x802200, 500);
 560         WriteLog("\nM68000 disassembly at $802518...\n");
 561         jaguar_dasm(0x802518, 100);//*/
 562
 563 /*      WriteLog("\n\nM68000 disassembly at $803F00 (look @ $803F2A)...\n");
 564         jaguar_dasm(0x803F00, 500);
 565         WriteLog("\n");//*/
 566
 567 /*      WriteLog("\n\nM68000 disassembly at $802B00 (look @ $802B5E)...\n");
 568         jaguar_dasm(0x802B00, 500);
 569         WriteLog("\n");//*/
 570
 571 //      WriteLog("Jaguar: CD BIOS version %04X\n", JaguarReadWord(0x3004));
 572         WriteLog("Jaguar: Interrupt enable = %02X\n", TOMReadByte(0xF000E1) & 0x1F);
 573         WriteLog("Jaguar: VBL interrupt is %s\n", ((tom_irq_enabled(IRQ_VBLANK)) && (jaguar_interrupt_handler_is_valid(64))) ? "enabled" : "disabled");
 574         M68K_show_context();
 575 //#endif
 576 //#ifdef SOUND_OUTPUT
 577 //      ws_audio_done();
 578 //#endif
 579         cd_bios_done();
 580         cdrom_done();
 581         gpu_done();
 582         DSPDone();
 583         tom_done();
 584         jerry_done();
 585
 586         memory_free(jaguar_mainRom);
 587         memory_free(jaguar_bootRom);
 588         memory_free(jaguar_mainRam);
 589 }
 590
 591 void jaguar_reset(void)
 592 {
 593         if (jaguar_use_bios)
 594                 memcpy(jaguar_mainRam, jaguar_bootRom, 8);
 595         else
 596         {
 597                 SET32(jaguar_mainRam, 4, 0x00802000);
 598                 // Handle PD stuff...
 599                 // This should definitely go elsewhere (like in the cart load section)!
 600                 if (jaguar_mainRom[0] == 0x60 && jaguar_mainRom[1] == 0x1A)
 601                 {
 602                         uint32 runAddress = GET32(jaguar_mainRom, 0x2A);
 603                         uint32 progLength = GET32(jaguar_mainRom, 0x02);
 604                         WriteLog("Setting up PD ROM... Run address: %08X, length: %08X\n", runAddress, progLength);
 605                         memcpy(jaguar_mainRam + runAddress, jaguar_mainRom + 0x2E, progLength);
 606                         SET32(jaguar_mainRam, 4, runAddress);
 607                 }
 608         }
 609
 610 //      WriteLog("jaguar_reset():\n");
 611 //#ifdef SOUND_OUTPUT
 612 //      ws_audio_reset();
 613 //#endif
 614         cd_bios_reset();
 615         tom_reset();
 616         jerry_reset();
 617         gpu_reset();
 618         DSPReset();
 619         cdrom_reset();
 620     m68k_pulse_reset();                         // Reset the 68000
 621         WriteLog("\t68K PC=%06X SP=%08X\n", m68k_get_reg(NULL, M68K_REG_PC), m68k_get_reg(NULL, M68K_REG_A7));
 622 }
 623
 624 void jaguar_reset_handler(void)
 625 {
 626 }
 627
 628 void jaguar_exec(int16 * backbuffer, bool render)
 629 {
 630         uint32 i, vblank_duration = tom_get_vdb();
 631
 632         // vblank
 633         if (tom_irq_enabled(IRQ_VBLANK) && jaguar_interrupt_handler_is_valid(64))
 634         {
 635                 if (JaguarReadWord(0xF0004E) != 0x07FF) // VI (11 bits wide!)
 636                 {
 637                         tom_set_pending_video_int();
 638 //                      s68000interrupt(7, IRQ_VBLANK+64);
 639 //                      s68000flushInterrupts();
 640                         m68k_set_irq(7);                                        // IRQ_VBLANK+64??? Not autovectored??? No.
 641 // Could set a global variable here, to signal that this is a VBLANK interrupt...
 642 // Then again, since IRQ_VBLANK is set to zero, this would not be necessary in this case.
 643                 }
 644         }
 645
 646         for(i=0; i<vblank_duration; i++)
 647         {
 648 /*              uint32 invalid_instruction_address = s68000exec(m68k_cycles_per_scanline);
 649                 if (invalid_instruction_address != 0x80000000)
 650                         cd_bios_process(invalid_instruction_address);*/
 651                 m68k_execute(m68k_cycles_per_scanline);
 652                 // No CD handling... !!! FIX !!!
 653
 654                 cd_bios_exec(i);
 655                 tom_pit_exec(m68k_cycles_per_scanline);
 656                 tom_exec_scanline(backbuffer, i, false);
 657                 jerry_pit_exec(m68k_cycles_per_scanline);
 658                 jerry_i2s_exec(m68k_cycles_per_scanline);
 659                 gpu_exec(gpu_cycles_per_scanline);
 660                 if (dsp_enabled)
 661                         DSPExec(dsp_cycles_per_scanline);
 662         }
 663
 664         for (; i<jaguar_screen_scanlines; i++)
 665         {
 666 /*              uint32 invalid_instruction_address = s68000exec(m68k_cycles_per_scanline);
 667                 if (invalid_instruction_address != 0x80000000)
 668                         cd_bios_process(invalid_instruction_address);*/
 669                 m68k_execute(m68k_cycles_per_scanline);
 670                 // No CD handling... !!! FIX !!!
 671                 cd_bios_exec(i);
 672                 tom_pit_exec(m68k_cycles_per_scanline);
 673                 jerry_pit_exec(m68k_cycles_per_scanline);
 674                 jerry_i2s_exec(m68k_cycles_per_scanline);
 675                 tom_exec_scanline(backbuffer, i, render);
 676                 gpu_exec(gpu_cycles_per_scanline);
 677                 if (dsp_enabled)
 678                         DSPExec(dsp_cycles_per_scanline);
 679                 backbuffer += tom_width;
 680         }
 681 //#ifdef SOUND_OUTPUT
 682 //      system_sound_update();
 683 //#endif
 684 }
 685
 686 //
 687 // Main Jaguar execution loop (1 frame)
 688 //
 689 void JaguarExecute(int16 * backbuffer, bool render)
 690 {
 691         uint16 vp = TOMReadWord(0xF0003E);//Hmm. This is a WO register. Will work? Looks like. But wrong behavior!
 692         uint16 vi = TOMReadWord(0xF0004E);//Another WO register...
 693         uint16 vdb = TOMReadWord(0xF00046);
 694 //      uint16 endingLine =
 695 //Note: This is the *definite* end of the display, though VDE *might* be less than this...
 696 //      uint16 vbb = TOMReadWord(0xF00040);
 697 //It seems that they mean it when they say that VDE is the end of object processing.
 698 //However, we need to be able to tell the OP (or TOM) that we've reached the end of the
 699 //buffer and not to write any more pixels... !!! FIX !!!
 700         uint16 vde = TOMReadWord(0xF00048);
 701
 702 /*extern int effect_start;
 703 if (effect_start)
 704 {
 705         WriteLog("JagExe: VP=%u, VI=%u, VDB=%u, VBB=%u CPU CPS=%u, GPU CPS=%u\n", vp, vi, vdb, vbb, m68k_cycles_per_scanline, gpu_cycles_per_scanline);
 706 }//*/
 707
 708         for(uint16 i=0; i<vp; i++)
 709         {
 710                 // Increment the horizontal count (why? RNG?)
 711                 TOMWriteWord(0xF00004, TOMReadWord(0xF00004) + 1);
 712
 713                 TOMWriteWord(0xF00006, i);                              // Write the VC
 714
 715                 if (i == vi)                                                            // Time for Vertical Interrupt?
 716                 {
 717                         if (tom_irq_enabled(IRQ_VBLANK) && jaguar_interrupt_handler_is_valid(64))
 718                         {
 719                                 // We don't have to worry about autovectors & whatnot because the Jaguar
 720                                 // tells you through registers who sent the interrupt...
 721                                 tom_set_pending_video_int();
 722                                 m68k_set_irq(7);
 723                         }
 724                 }
 725
 726 //              uint32 invalid_instruction_address = s68000exec(m68k_cycles_per_scanline);
 727 //              if (invalid_instruction_address != 0x80000000)
 728 //                      cd_bios_process(invalid_instruction_address);
 729                 // These are divided by 2 because we're executing *half* lines...!
 730                 m68k_execute(m68k_cycles_per_scanline / 2);
 731                 // No CD handling... !!! FIX !!!
 732                 cd_bios_exec(i);        // NOTE: Ignores parameter...
 733 //I'm pretty sure these run at the RISC clock rate...
 734 //              tom_pit_exec(m68k_cycles_per_scanline / 2);
 735 //              jerry_pit_exec(m68k_cycles_per_scanline / 2);
 736 //              jerry_i2s_exec(m68k_cycles_per_scanline / 2);
 737                 tom_pit_exec(gpu_cycles_per_scanline / 2);
 738                 jerry_pit_exec(gpu_cycles_per_scanline / 2);
 739                 jerry_i2s_exec(gpu_cycles_per_scanline / 2);
 740                 gpu_exec(gpu_cycles_per_scanline / 2);
 741                 if (dsp_enabled)
 742                         DSPExec(dsp_cycles_per_scanline / 2);
 743
 744 //Interlacing is still not handled correctly here...
 745                 if (i >= vdb && i < vde)//vbb)
 746                 {
 747                         if (!(i & 0x01))                                                // Execute OP only on even lines (non-interlaced only!)
 748                         {
 749                                 tom_exec_scanline(backbuffer, i/2, render);     // i/2 is a kludge...
 750                                 backbuffer += TOMGetSDLScreenPitch() / 2;       // Convert bytes to words...
 751                         }
 752                 }
 753         }
 754
 755 //#ifdef SOUND_OUTPUT
 756 //      system_sound_update();
 757 //#endif
 758 }
 759
 760 // Temp debugging stuff
 761
 762 void DumpMainMemory(void)
 763 {
 764         FILE * fp = fopen("./memdump.bin", "wb");
 765
 766         if (fp == NULL)
 767                 return;
 768
 769         fwrite(jaguar_mainRam, 1, 0x400000, fp);
 770         fclose(fp);
 771 }
 772
 773 uint8 * GetRamPtr(void)
 774 {
 775         return jaguar_mainRam;
 776 }