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 LOG_UNMAPPED_MEMORY_ACCESSES
  15 //#define SOUND_OUTPUT
  16 #define CPU_DEBUG
  17 #define JAGUAR_WIP_RELEASE
  18 //Do this in makefile??? Yes! Could, but it's easier to define here...
  19 //#define LOG_UNMAPPED_MEMORY_ACCESSES
  20
  21 // Private function prototypes
  22
  23 unsigned jaguar_unknown_readbyte(unsigned address);
  24 unsigned jaguar_unknown_readword(unsigned address);
  25 void jaguar_unknown_writebyte(unsigned address, unsigned data);
  26 void jaguar_unknown_writeword(unsigned address, unsigned data);
  27 void M68K_show_context(void);
  28
  29 // External variables
  30
  31 extern bool hardwareTypeNTSC;                           // Set to false for PAL
  32
  33 // These values are overridden by command line switches...
  34
  35 bool dsp_enabled = false;
  36 bool jaguar_use_bios = true;                            // Default is now to USE the BIOS
  37 uint32 jaguar_active_memory_dumps = 0;
  38
  39 uint32 jaguar_mainRom_crc32;
  40
  41 static uint32 m68k_cycles_per_scanline;
  42 static uint32 gpu_cycles_per_scanline;
  43 static uint32 dsp_cycles_per_scanline;
  44 static uint32 jaguar_screen_scanlines;
  45
  46 /*static*/ uint8 * jaguar_mainRam = NULL;
  47 /*static*/ uint8 * jaguar_bootRom = NULL;
  48 /*static*/ uint8 * jaguar_mainRom = NULL;
  49
  50
  51 //
  52 // Callback function to detect illegal instructions
  53 //
  54 void M68KInstructionHook(void)
  55 {
  56         uint32 m68kPC = m68k_get_reg(NULL, M68K_REG_PC);
  57
  58 /*      static char buffer[2048];
  59         m68k_disassemble(buffer, m68kPC, M68K_CPU_TYPE_68000);
  60         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));//*/
  61
  62 /*      if (m68kPC == 0x803F16)
  63         {
  64                 WriteLog("M68K: Registers found at $803F16:\n");
  65                 WriteLog( "\t68K PC=%06X\n", m68k_get_reg(NULL, M68K_REG_PC));
  66                 for(int i=M68K_REG_D0; i<=M68K_REG_D7; i++)
  67                         WriteLog( "\tD%i = %08X\n", i-M68K_REG_D0, m68k_get_reg(NULL, (m68k_register_t)i));
  68                 WriteLog( "\n");
  69                 for(int i=M68K_REG_A0; i<=M68K_REG_A7; i++)
  70                         WriteLog( "\tA%i = %08X\n", i-M68K_REG_A0, m68k_get_reg(NULL, (m68k_register_t)i));
  71         }*/
  72
  73         if (!m68k_is_valid_instruction(jaguar_word_read(m68kPC), M68K_CPU_TYPE_68000))
  74         {
  75                 WriteLog("\nEncountered illegal instruction at %08X!!!\n\nAborting!\n", m68kPC);
  76                 uint32 topOfStack = m68k_get_reg(NULL, M68K_REG_A7);
  77                 WriteLog("M68K: Top of stack: %08X. Stack trace:\n", jaguar_long_read(topOfStack));
  78                 for(int i=0; i<10; i++)
  79                         WriteLog("%06X: %08X\n", topOfStack - (i * 4), jaguar_long_read(topOfStack - (i * 4)));
  80                 WriteLog("Jaguar: VBL interrupt is %s\n", ((tom_irq_enabled(IRQ_VBLANK)) && (jaguar_interrupt_handler_is_valid(64))) ? "enabled" : "disabled");
  81                 M68K_show_context();
  82                 log_done();
  83                 exit(0);
  84         }
  85 }
  86
  87 //
  88 // Musashi 68000 read/write/IRQ functions
  89 //
  90
  91 int irq_ack_handler(int level)
  92 {
  93         int vector = M68K_INT_ACK_AUTOVECTOR;
  94
  95         // The GPU/DSP/etc are probably *not* issuing an NMI, but it seems to work OK...
  96
  97         if (level == 7)
  98         {
  99                 m68k_set_irq(0);                                                // Clear the IRQ...
 100                 vector = 64;                                                    // Set user interrupt #0
 101         }
 102
 103         return vector;
 104 }
 105
 106 unsigned int m68k_read_memory_8(unsigned int address)
 107 {
 108 //WriteLog( "[RM8] Addr: %08X\n", address);
 109         unsigned int retVal = 0;
 110
 111         if ((address >= 0x000000) && (address <= 0x3FFFFF))
 112                 retVal = jaguar_mainRam[address];
 113         else if ((address >= 0x800000) && (address <= 0xDFFFFF))
 114                 retVal = jaguar_mainRom[address - 0x800000];
 115         else if ((address >= 0xE00000) && (address <= 0xE3FFFF))
 116                 retVal = jaguar_bootRom[address - 0xE00000];
 117         else if ((address >= 0xDFFF00) && (address <= 0xDFFFFF))
 118                 retVal = cdrom_byte_read(address);
 119         else if ((address >= 0xF00000) && (address <= 0xF0FFFF))
 120                 retVal = tom_byte_read(address);
 121         else if ((address >= 0xF10000) && (address <= 0xF1FFFF))
 122                 retVal = jerry_byte_read(address);
 123         else
 124                 retVal = jaguar_unknown_readbyte(address);
 125
 126     return retVal;
 127 }
 128
 129 void gpu_dump_disassembly(void);
 130 void gpu_dump_registers(void);
 131
 132 unsigned int m68k_read_memory_16(unsigned int address)
 133 {
 134 //WriteLog( "[RM16] Addr: %08X\n", address);
 135 /*if (m68k_get_reg(NULL, M68K_REG_PC) == 0x00005FBA)
 136 //      for(int i=0; i<10000; i++)
 137         WriteLog("[M68K] In routine #6!\n");//*/
 138 //if (m68k_get_reg(NULL, M68K_REG_PC) == 0x00006696) // GPU Program #4
 139 //if (m68k_get_reg(NULL, M68K_REG_PC) == 0x00005B3C)    // GPU Program #2
 140 /*if (m68k_get_reg(NULL, M68K_REG_PC) == 0x00005BA8)    // GPU Program #3
 141 {
 142         WriteLog("[M68K] About to run GPU! (Addr:%08X, data:%04X)\n", address, tom_word_read(address));
 143         gpu_dump_registers();
 144         gpu_dump_disassembly();
 145 //      for(int i=0; i<10000; i++)
 146 //              WriteLog( "[M68K] About to run GPU!\n");
 147 }//*/
 148 //WriteLog( "[WM8  PC=%08X] Addr: %08X, val: %02X\n", m68k_get_reg(NULL, M68K_REG_PC), address, value);
 149 /*if (m68k_get_reg(NULL, M68K_REG_PC) >= 0x00006696 && m68k_get_reg(NULL, M68K_REG_PC) <= 0x000066A8)
 150 {
 151         if (address == 0x000066A0)
 152         {
 153                 gpu_dump_registers();
 154                 gpu_dump_disassembly();
 155         }
 156         for(int i=0; i<10000; i++)
 157                 WriteLog( "[M68K] About to run GPU! (Addr:%08X, data:%04X)\n", address, tom_word_read(address));
 158 }//*/
 159     unsigned int retVal = 0;
 160
 161         if ((address >= 0x000000) && (address <= 0x3FFFFE))
 162                 retVal = (jaguar_mainRam[address] << 8) | jaguar_mainRam[address+1];
 163         else if ((address >= 0x800000) && (address <= 0xDFFFFE))
 164                 retVal = (jaguar_mainRom[address - 0x800000] << 8) | jaguar_mainRom[address - 0x800000 + 1];
 165         else if ((address >= 0xE00000) && (address <= 0xE3FFFE))
 166                 retVal = (jaguar_bootRom[address - 0xE00000] << 8) | jaguar_bootRom[address - 0xE00000 + 1];
 167         else if ((address >= 0xDFFF00) && (address <= 0xDFFFFE))
 168                 retVal = cdrom_word_read(address);
 169         else if ((address >= 0xF00000) && (address <= 0xF0FFFE))
 170                 retVal = tom_word_read(address);
 171         else if ((address >= 0xF10000) && (address <= 0xF1FFFE))
 172                 retVal = jerry_word_read(address);
 173         else
 174 //{
 175 //WriteLog( "[RM16] Unknown address: %08X\n", address);
 176                 retVal = jaguar_unknown_readword(address);
 177 //}
 178
 179     return retVal;
 180 }
 181
 182 unsigned int m68k_read_memory_32(unsigned int address)
 183 {
 184 //WriteLog( "--> [RM32]\n");
 185     return (m68k_read_memory_16(address) << 16) | m68k_read_memory_16(address + 2);
 186 }
 187
 188 void m68k_write_memory_8(unsigned int address, unsigned int value)
 189 {
 190 //if ((address >= 0x1FF020 && address <= 0x1FF03F) || (address >= 0x1FF820 && address <= 0x1FF83F))
 191 //      WriteLog("M68K: Writing %02X at %08X\n", value, address);
 192 //WriteLog( "[WM8  PC=%08X] Addr: %08X, val: %02X\n", m68k_get_reg(NULL, M68K_REG_PC), address, value);
 193         if ((address >= 0x000000) && (address <= 0x3FFFFF))
 194                 jaguar_mainRam[address] = value;
 195         else if ((address >= 0xDFFF00) && (address <= 0xDFFFFF))
 196                 cdrom_byte_write(address, value);
 197         else if ((address >= 0xF00000) && (address <= 0xF0FFFF))
 198                 tom_byte_write(address, value);
 199         else if ((address >= 0xF10000) && (address <= 0xF1FFFF))
 200                 jerry_byte_write(address, value);
 201         else
 202                 jaguar_unknown_writebyte(address, value);
 203 }
 204
 205 void m68k_write_memory_16(unsigned int address, unsigned int value)
 206 {
 207 extern int dsp_pc;//, dsp_control;
 208 if (address == 0xF1A116 && (value & 0x01))
 209 {
 210         WriteLog("  M68K(16): DSP is GO! (DSP_PC: %08X)\n\n", dsp_pc);
 211
 212 /*      static char buffer[512];
 213         uint32 j = 0xF1B000;
 214         while (j <= 0xF1BFFF)
 215         {
 216                 uint32 oldj = j;
 217                 j += dasmjag(JAGUAR_DSP, buffer, j);
 218                 WriteLog( "\t%08X: %s\n", oldj, buffer);
 219         }
 220         WriteLog( "\n");//*/
 221 }
 222 //else
 223 //      WriteLog("M68K(16): DSP halted... (Old value: %08X)\n", dsp_control);
 224
 225 //if ((address >= 0x1FF020 && address <= 0x1FF03F) || (address >= 0x1FF820 && address <= 0x1FF83F))
 226 //      WriteLog("M68K: Writing %04X at %08X\n", value, address);
 227 //WriteLog( "[WM16 PC=%08X] Addr: %08X, val: %04X\n", m68k_get_reg(NULL, M68K_REG_PC), address, value);
 228 //if (address >= 0xF02200 && address <= 0xF0229F)
 229 //      WriteLog("M68K: Writing to blitter --> %04X at %08X\n", value, address);
 230 //if (address >= 0x0E75D0 && address <= 0x0E75E7)
 231 //      WriteLog("M68K: Writing %04X at %08X, M68K PC=%08X\n", value, address, m68k_get_reg(NULL, M68K_REG_PC));
 232 /*extern uint32 totalFrames;
 233 extern bool suppressOutput;
 234 if (totalFrames >= 59)
 235         suppressOutput = false;//*/
 236 /*if (address == 0xF02114)
 237         WriteLog("M68K: Writing to GPU_CTRL (frame:%u)... [M68K PC:%08X]\n", totalFrames, m68k_get_reg(NULL, M68K_REG_PC));
 238 if (address == 0xF02110)
 239         WriteLog("M68K: Writing to GPU_PC (frame:%u)... [M68K PC:%08X]\n", totalFrames, m68k_get_reg(NULL, M68K_REG_PC));//*/
 240 //if (address >= 0xF03B00 && address <= 0xF03DFF)
 241 //      WriteLog("M68K: Writing %04X to %08X...\n", value, address);
 242
 243         if ((address >= 0x000000) && (address <= 0x3FFFFE))
 244         {
 245                 jaguar_mainRam[address] = value >> 8;
 246                 jaguar_mainRam[address + 1] = value & 0xFF;
 247         }
 248         else if ((address >= 0xDFFF00) && (address <= 0xDFFFFE))
 249                 cdrom_word_write(address, value);
 250         else if ((address >= 0xF00000) && (address <= 0xF0FFFE))
 251                 tom_word_write(address, value);
 252         else if ((address >= 0xF10000) && (address <= 0xF1FFFE))
 253                 jerry_word_write(address, value);
 254         else
 255                 jaguar_unknown_writeword(address, value);
 256 }
 257
 258 void m68k_write_memory_32(unsigned int address, unsigned int value)
 259 {
 260 extern int dsp_pc;//, dsp_control;
 261 if (address == 0xF1A114 && (value & 0x01))
 262         WriteLog("M68K(32): DSP is GO! (DSP_PC: %08X)\n", dsp_pc);
 263 //else
 264 //      WriteLog("M68K(32): DSP halted... (Old value: %08X)\n", dsp_control);
 265
 266 //WriteLog( "--> [WM32]\n");
 267         m68k_write_memory_16(address, value >> 16);
 268         m68k_write_memory_16(address + 2, value & 0xFFFF);
 269 }
 270
 271
 272
 273 uint32 jaguar_get_handler(uint32 i)
 274 {
 275 //      return (jaguar_word_read(i<<2) << 16) | jaguar_word_read((i<<2) + 2);
 276 //      return (jaguar_word_read(i*4) << 16) | jaguar_word_read((i*4) + 2);
 277         return jaguar_long_read(i * 4);
 278 }
 279
 280 uint32 jaguar_interrupt_handler_is_valid(uint32 i)
 281 {
 282         uint32 handler = jaguar_get_handler(i);
 283         if (handler && (handler != 0xFFFFFFFF))
 284                 return 1;
 285         else
 286                 return 0;
 287 }
 288
 289 void M68K_show_context(void)
 290 {
 291         WriteLog( "\t68K PC=%06X\n", m68k_get_reg(NULL, M68K_REG_PC));
 292         for(int i=M68K_REG_D0; i<=M68K_REG_D7; i++)
 293                 WriteLog( "\tD%i = %08X\n", i-M68K_REG_D0, m68k_get_reg(NULL, (m68k_register_t)i));
 294         WriteLog( "\n");
 295         for(int i=M68K_REG_A0; i<=M68K_REG_A7; i++)
 296                 WriteLog( "\tA%i = %08X\n", i-M68K_REG_A0, m68k_get_reg(NULL, (m68k_register_t)i));
 297
 298         WriteLog( "68K disasm\n");
 299 //      jaguar_dasm(s68000readPC()-0x1000,0x20000);
 300         jaguar_dasm(m68k_get_reg(NULL, M68K_REG_PC) - 0x80, 0x200);
 301 //      jaguar_dasm(0x5000, 0x14414);
 302
 303         WriteLog( "..................\n");
 304
 305         if (tom_irq_enabled(IRQ_VBLANK))
 306         {
 307                 WriteLog( "vblank int: enabled\n");
 308                 jaguar_dasm(jaguar_get_handler(64), 0x200);
 309         }
 310         else
 311                 WriteLog( "vblank int: disabled\n");
 312
 313         WriteLog( "..................\n");
 314
 315         for(int i=0; i<256; i++)
 316                 WriteLog( "handler %03i at $%08X\n", i, (unsigned int)jaguar_get_handler(i));
 317 }
 318
 319 //
 320 // Unknown read/write byte/word routines
 321 //
 322
 323 void jaguar_unknown_writebyte(unsigned address, unsigned data)
 324 {
 325 #ifdef LOG_UNMAPPED_MEMORY_ACCESSES
 326         WriteLog( "jaguar: unknown byte %02X write at %08X (PC=%06X)\n", data, address, m68k_get_reg(NULL, M68K_REG_PC));
 327 #endif
 328 }
 329
 330 void jaguar_unknown_writeword(unsigned address, unsigned data)
 331 {
 332 #ifdef LOG_UNMAPPED_MEMORY_ACCESSES
 333         WriteLog( "jaguar: unknown word %04X write at %08X (PC=%06X)\n", data, address, m68k_get_reg(NULL, M68K_REG_PC));
 334 #endif
 335 }
 336
 337 unsigned jaguar_unknown_readbyte(unsigned address)
 338 {
 339 #ifdef LOG_UNMAPPED_MEMORY_ACCESSES
 340         WriteLog( "jaguar: unknown byte read at %08X (PC=%06X)\n", address, m68k_get_reg(NULL, M68K_REG_PC));
 341 #endif
 342     return 0xFF;
 343 }
 344
 345 unsigned jaguar_unknown_readword(unsigned address)
 346 {
 347 #ifdef LOG_UNMAPPED_MEMORY_ACCESSES
 348         WriteLog( "Jaguar: Unknown word read at %08X (PC=%06X)\n", address, m68k_get_reg(NULL, M68K_REG_PC));
 349 #endif
 350     return 0xFFFF;
 351 }
 352
 353 //
 354 // Disassemble M68K instructions at the given offset
 355 //
 356
 357 unsigned int m68k_read_disassembler_8(unsigned int address)
 358 {
 359         return m68k_read_memory_8(address);
 360 }
 361
 362 unsigned int m68k_read_disassembler_16(unsigned int address)
 363 {
 364         return m68k_read_memory_16(address);
 365 }
 366
 367 unsigned int m68k_read_disassembler_32(unsigned int address)
 368 {
 369         return m68k_read_memory_32(address);
 370 }
 371
 372 void jaguar_dasm(uint32 offset, uint32 qt)
 373 {
 374 #ifdef CPU_DEBUG
 375         static char buffer[2048];//, mem[64];
 376         int pc = offset, oldpc;
 377
 378         for(uint32 i=0; i<qt; i++)
 379         {
 380 /*              oldpc = pc;
 381                 for(int j=0; j<64; j++)
 382                         mem[j^0x01] = jaguar_byte_read(pc + j);
 383
 384                 pc += Dasm68000((char *)mem, buffer, 0);
 385                 WriteLog("%08X: %s\n", oldpc, buffer);//*/
 386                 oldpc = pc;
 387                 pc += m68k_disassemble(buffer, pc, M68K_CPU_TYPE_68000);
 388                 WriteLog("%08X: %s\n", oldpc, buffer);//*/
 389         }
 390 #endif
 391 }
 392
 393 unsigned jaguar_byte_read(unsigned int offset)
 394 {
 395         uint8 data = 0x00;
 396
 397         offset &= 0xFFFFFF;
 398         if (offset < 0x400000)
 399 //              data = (jaguar_mainRam[(offset^0x01) & 0x3FFFFF]);
 400                 data = jaguar_mainRam[offset & 0x3FFFFF];
 401         else if ((offset >= 0x800000) && (offset < 0xC00000))
 402 //              data = (jaguar_mainRom[(offset^0x01)-0x800000]);
 403                 data = jaguar_mainRom[offset - 0x800000];
 404 //      else if ((offset >= 0xDFFF00) && (offset < 0xDFFF00))
 405         else if ((offset >= 0xDFFF00) && (offset <= 0xDFFFFF))
 406                 data = cdrom_byte_read(offset);
 407         else if ((offset >= 0xE00000) && (offset < 0xE40000))
 408 //              data = (jaguar_bootRom[(offset^0x01) & 0x3FFFF]);
 409                 data = jaguar_bootRom[offset & 0x3FFFF];
 410         else if ((offset >= 0xF00000) && (offset < 0xF10000))
 411                 data = tom_byte_read(offset);
 412         else if ((offset >= 0xF10000) && (offset < 0xF20000))
 413                 data = jerry_byte_read(offset);
 414         else
 415                 data = jaguar_unknown_readbyte(offset);
 416
 417         return data;
 418 }
 419
 420 unsigned jaguar_word_read(unsigned int offset)
 421 {
 422 //TEMP--Mirror of F03000?
 423 /*if (offset >= 0xF0B000 && offset <= 0xF0BFFF)
 424 WriteLog( "[JWR16] --> Possible GPU RAM mirror access! [%08X]\n", offset);//*/
 425
 426         offset &= 0xFFFFFF;
 427         if (offset <= 0x3FFFFE)
 428         {
 429 //              return (jaguar_mainRam[(offset+1) & 0x3FFFFF] << 8) | jaguar_mainRam[(offset+0) & 0x3FFFFF];
 430                 return (jaguar_mainRam[(offset+0) & 0x3FFFFF] << 8) | jaguar_mainRam[(offset+1) & 0x3FFFFF];
 431         }
 432         else if ((offset >= 0x800000) && (offset <= 0xBFFFFE))
 433         {
 434                 offset -= 0x800000;
 435 //              return (jaguar_mainRom[offset+1] << 8) | jaguar_mainRom[offset+0];
 436                 return (jaguar_mainRom[offset+0] << 8) | jaguar_mainRom[offset+1];
 437         }
 438 //      else if ((offset >= 0xDFFF00) && (offset < 0xDFFF00))
 439         else if ((offset >= 0xDFFF00) && (offset <= 0xDFFFFE))
 440                 return cdrom_word_read(offset);
 441         else if ((offset >= 0xE00000) && (offset <= 0xE3FFFE))
 442 //              return *((uint16 *)&jaguar_bootRom[offset & 0x3FFFF]);
 443                 return (jaguar_bootRom[(offset+0) & 0x3FFFF] << 8) | jaguar_bootRom[(offset+1) & 0x3FFFF];
 444         else if ((offset >= 0xF00000) && (offset <= 0xF0FFFE))
 445                 return tom_word_read(offset);
 446         else if ((offset >= 0xF10000) && (offset <= 0xF1FFFE))
 447 //{
 448 //WriteLog("Reading from JERRY offset %08X...\n", offset);
 449                 return jerry_word_read(offset);
 450 //}
 451
 452         return jaguar_unknown_readword(offset);
 453 }
 454
 455 void jaguar_byte_write(unsigned offset, unsigned data)
 456 {
 457         offset &= 0xFFFFFF;
 458         if (offset < 0x400000)
 459         {
 460 //              jaguar_mainRam[(offset^0x01) & 0x3FFFFF] = data;
 461                 jaguar_mainRam[offset & 0x3FFFFF] = data;
 462                 return;
 463         }
 464 //      else if ((offset >= 0xDFFF00) && (offset < 0xDFFF00))
 465         else if ((offset >= 0xDFFF00) && (offset <= 0xDFFFFF))
 466         {
 467                 cdrom_byte_write(offset, data);
 468                 return;
 469         }
 470         else if ((offset >= 0xF00000) && (offset <= 0xF0FFFF))
 471         {
 472                 tom_byte_write(offset, data);
 473                 return;
 474         }
 475         else if ((offset >= 0xF10000) && (offset <= 0xF1FFFF))
 476         {
 477                 jerry_byte_write(offset, data);
 478                 return;
 479         }
 480
 481         jaguar_unknown_writebyte(offset, data);
 482 }
 483
 484 void jaguar_word_write(unsigned offset, unsigned data)
 485 {
 486 extern int dsp_pc;//, dsp_control;
 487 if (offset == 0xF1A116 && (data & 0x01))
 488         WriteLog("  JagWW: DSP is GO! (DSP_PC: %08X)\n", dsp_pc);
 489 //else
 490 //      WriteLog("JagWW: DSP halted... (Old value: %08X)\n", dsp_control);
 491
 492 //extern int blit_start_log;
 493 //if (blit_start_log)
 494 /*{
 495         if (offset == 0x0674DE)
 496                 WriteLog( "[JWW16] Bad write starting @ 0674DE! [%04X]\n", data);
 497 }//*/
 498 //TEMP--Mirror of F03000?
 499 //if (offset >= 0xF0B000 && offset <= 0xF0BFFF)
 500 //WriteLog( "[JWW16] --> Possible GPU RAM mirror access! [%08X]", offset);
 501 //if ((offset >= 0x1FF020 && offset <= 0x1FF03F) || (offset >= 0x1FF820 && offset <= 0x1FF83F))
 502 //      WriteLog("JagWW: Writing %04X at %08X\n", data, offset);
 503         offset &= 0xFFFFFF;
 504
 505         if (offset <= 0x3FFFFE)
 506         {
 507 //              jaguar_mainRam[(offset+0) & 0x3FFFFF] = data & 0xFF;
 508 //              jaguar_mainRam[(offset+1) & 0x3FFFFF] = (data>>8) & 0xFF;
 509                 jaguar_mainRam[(offset+0) & 0x3FFFFF] = (data>>8) & 0xFF;
 510                 jaguar_mainRam[(offset+1) & 0x3FFFFF] = data & 0xFF;
 511                 return;
 512         }
 513         else if ((offset >= 0xDFFF00) && (offset <= 0xDFFFFE))
 514         {
 515                 cdrom_word_write(offset, data);
 516                 return;
 517         }
 518         else if ((offset >= 0xF00000) && (offset <= 0xF0FFFE))
 519         {
 520                 tom_word_write(offset, data);
 521                 return;
 522         }
 523         else if ((offset >= 0xF10000) && (offset <= 0xF1FFFE))
 524         {
 525                 jerry_word_write(offset, data);
 526                 return;
 527         }
 528
 529         jaguar_unknown_writeword(offset, data);
 530 }
 531
 532 unsigned jaguar_long_read(unsigned int offset)
 533 {
 534         return (jaguar_word_read(offset) << 16) | jaguar_word_read(offset+2);
 535 }
 536
 537 void jaguar_long_write(unsigned offset, unsigned data)
 538 {
 539 extern int dsp_pc;//, dsp_control;
 540 if (offset == 0xF1A114 && (data & 0x01))
 541         WriteLog("JagLW: DSP is GO! (DSP_PC: %08X)\n", dsp_pc);
 542 //else
 543 //      WriteLog("JagLW: DSP halted... (Old value: %08X)\n", dsp_control);
 544
 545         jaguar_word_write(offset, data >> 16);
 546         jaguar_word_write(offset+2, data & 0xFFFF);
 547 }
 548
 549 //
 550 // Jaguar console initialization
 551 //
 552 void jaguar_init(void)
 553 {
 554         memory_malloc_secure((void **)&jaguar_mainRam, 0x400000, "Jaguar 68K CPU RAM");
 555         memory_malloc_secure((void **)&jaguar_bootRom, 0x040000, "Jaguar 68K CPU BIOS ROM");
 556         memory_malloc_secure((void **)&jaguar_mainRom, 0x600000, "Jaguar 68K CPU ROM");
 557         memset(jaguar_mainRam, 0x00, 0x400000);
 558 //      memset(jaguar_mainRom, 0xFF, 0x200000); // & set it to all Fs...
 559         memset(jaguar_mainRom, 0x00, 0x200000); // & set it to all 0s...
 560
 561 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\Brain Dead 13.cdi");
 562 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\baldies.cdi");
 563 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\mystdemo.cdi");
 564 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\battlemorph.cdi");
 565 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\primalrage.cdi");
 566 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\Dragons Lair.cdi");
 567
 568         // Should these be hardwired or read from VP?
 569         jaguar_screen_scanlines = (hardwareTypeNTSC ? 524 : 624);
 570 //Should the divisor be 50 for PAL??? Let's try it!
 571         m68k_cycles_per_scanline = (hardwareTypeNTSC ? M68K_CLOCK_RATE_NTSC : M68K_CLOCK_RATE_PAL) / (jaguar_screen_scanlines * (hardwareTypeNTSC ? 60 : 50));
 572         gpu_cycles_per_scanline = dsp_cycles_per_scanline
 573                 = (hardwareTypeNTSC ? RISC_CLOCK_RATE_NTSC : RISC_CLOCK_RATE_PAL) / (jaguar_screen_scanlines * (hardwareTypeNTSC ? 60 : 50));
 574
 575 //#ifdef SOUND_OUTPUT
 576 //      ws_audio_init();
 577 //#endif
 578
 579         m68k_set_cpu_type(M68K_CPU_TYPE_68000);
 580         gpu_init();
 581         dsp_init();
 582         tom_init();
 583         jerry_init();
 584         cdrom_init();
 585 }
 586
 587 void jaguar_done(void)
 588 {
 589 //#ifdef CPU_DEBUG
 590 //      for(int i=M68K_REG_A0; i<=M68K_REG_A7; i++)
 591 //              WriteLog("\tA%i = 0x%.8x\n", i-M68K_REG_A0, m68k_get_reg(NULL, (m68k_register_t)i));
 592         int32 topOfStack = m68k_get_reg(NULL, M68K_REG_A7);
 593         WriteLog("M68K: Top of stack: %08X. Stack trace:\n", jaguar_long_read(topOfStack));
 594         for(int i=-2; i<9; i++)
 595                 WriteLog("%06X: %08X\n", topOfStack + (i * 4), jaguar_long_read(topOfStack + (i * 4)));
 596
 597 /*      WriteLog("\nM68000 disassembly at $802288...\n");
 598         jaguar_dasm(0x802288, 3);
 599         WriteLog("\nM68000 disassembly at $802200...\n");
 600         jaguar_dasm(0x802200, 500);
 601         WriteLog("\nM68000 disassembly at $802518...\n");
 602         jaguar_dasm(0x802518, 100);//*/
 603
 604 /*      WriteLog("\n\nM68000 disassembly at $803F00 (look @ $803F2A)...\n");
 605         jaguar_dasm(0x803F00, 500);
 606         WriteLog("\n");//*/
 607
 608 /*      WriteLog("\n\nM68000 disassembly at $802B00 (look @ $802B5E)...\n");
 609         jaguar_dasm(0x802B00, 500);
 610         WriteLog("\n");//*/
 611
 612 //      WriteLog("Jaguar: CD BIOS version %04X\n", jaguar_word_read(0x3004));
 613         WriteLog("Jaguar: Interrupt enable = %02X\n", tom_byte_read(0xF000E1) & 0x1F);
 614         WriteLog("Jaguar: VBL interrupt is %s\n", ((tom_irq_enabled(IRQ_VBLANK)) && (jaguar_interrupt_handler_is_valid(64))) ? "enabled" : "disabled");
 615         M68K_show_context();
 616 //#endif
 617 //#ifdef SOUND_OUTPUT
 618 //      ws_audio_done();
 619 //#endif
 620         cd_bios_done();
 621         cdrom_done();
 622         tom_done();
 623         jerry_done();
 624         memory_free(jaguar_mainRom);
 625         memory_free(jaguar_bootRom);
 626         memory_free(jaguar_mainRam);
 627 }
 628
 629 void jaguar_reset(void)
 630 {
 631         if (jaguar_use_bios)
 632                 memcpy(jaguar_mainRam, jaguar_bootRom, 8);
 633         else
 634         {
 635                 SET32(jaguar_mainRam, 4, 0x00802000);
 636                 // Handle PD stuff...
 637                 // This should definitely go elsewhere (like in the cart load section)!
 638                 if (jaguar_mainRom[0] == 0x60 && jaguar_mainRom[1] == 0x1A)
 639                 {
 640                         uint32 runAddress = GET32(jaguar_mainRom, 0x2A);
 641                         uint32 progLength = GET32(jaguar_mainRom, 0x02);
 642                         WriteLog("Setting up PD ROM... Run address: %08X, length: %08X\n", runAddress, progLength);
 643                         memcpy(jaguar_mainRam + runAddress, jaguar_mainRom + 0x2E, progLength);
 644                         SET32(jaguar_mainRam, 4, runAddress);
 645                 }
 646         }
 647
 648 //      WriteLog("jaguar_reset():\n");
 649 //#ifdef SOUND_OUTPUT
 650 //      ws_audio_reset();
 651 //#endif
 652         cd_bios_reset();
 653         tom_reset();
 654         jerry_reset();
 655         gpu_reset();
 656         dsp_reset();
 657         cdrom_reset();
 658     m68k_pulse_reset();                         // Reset the 68000
 659         WriteLog( "\t68K PC=%06X SP=%08X\n", m68k_get_reg(NULL, M68K_REG_PC), m68k_get_reg(NULL, M68K_REG_A7));
 660 }
 661
 662 void jaguar_reset_handler(void)
 663 {
 664 }
 665
 666 void jaguar_exec(int16 * backbuffer, bool render)
 667 {
 668         uint32 i, vblank_duration = tom_get_vdb();
 669
 670         // vblank
 671         if ((tom_irq_enabled(IRQ_VBLANK)) && (jaguar_interrupt_handler_is_valid(64)))
 672         {
 673                 if (jaguar_word_read(0xF0004E) != 0x07FF)       // VI (11 bits wide!)
 674                 {
 675                         tom_set_pending_video_int();
 676 //                      s68000interrupt(7, IRQ_VBLANK+64);
 677 //                      s68000flushInterrupts();
 678                         m68k_set_irq(7);                                        // IRQ_VBLANK+64??? Not autovectored??? No.
 679 // Could set a global variable here, to signal that this is a VBLANK interrupt...
 680 // Then again, since IRQ_VBLANK is set to zero, this would not be necessary in this case.
 681                 }
 682         }
 683
 684         for(i=0; i<vblank_duration; i++)
 685         {
 686 /*              uint32 invalid_instruction_address = s68000exec(m68k_cycles_per_scanline);
 687                 if (invalid_instruction_address != 0x80000000)
 688                         cd_bios_process(invalid_instruction_address);*/
 689                 m68k_execute(m68k_cycles_per_scanline);
 690                 // No CD handling... !!! FIX !!!
 691
 692                 cd_bios_exec(i);
 693                 tom_pit_exec(m68k_cycles_per_scanline);
 694                 tom_exec_scanline(backbuffer, i, false);
 695                 jerry_pit_exec(m68k_cycles_per_scanline);
 696                 jerry_i2s_exec(m68k_cycles_per_scanline);
 697                 gpu_exec(gpu_cycles_per_scanline);
 698                 if (dsp_enabled)
 699                         dsp_exec(dsp_cycles_per_scanline);
 700         }
 701
 702         for (; i<jaguar_screen_scanlines; i++)
 703         {
 704 /*              uint32 invalid_instruction_address = s68000exec(m68k_cycles_per_scanline);
 705                 if (invalid_instruction_address != 0x80000000)
 706                         cd_bios_process(invalid_instruction_address);*/
 707                 m68k_execute(m68k_cycles_per_scanline);
 708                 // No CD handling... !!! FIX !!!
 709                 cd_bios_exec(i);
 710                 tom_pit_exec(m68k_cycles_per_scanline);
 711                 jerry_pit_exec(m68k_cycles_per_scanline);
 712                 jerry_i2s_exec(m68k_cycles_per_scanline);
 713                 tom_exec_scanline(backbuffer, i, render);
 714                 gpu_exec(gpu_cycles_per_scanline);
 715                 if (dsp_enabled)
 716                         dsp_exec(dsp_cycles_per_scanline);
 717                 backbuffer += tom_width;
 718         }
 719 //#ifdef SOUND_OUTPUT
 720 //      system_sound_update();
 721 //#endif
 722 }
 723
 724 //
 725 // Main Jaguar execution loop (1 frame)
 726 //
 727 void JaguarExecute(int16 * backbuffer, bool render)
 728 {
 729         uint16 vp = tom_word_read(0xF0003E);//Hmm. This is a WO register. Will work? Looks like. But wrong behavior!
 730         uint16 vi = tom_word_read(0xF0004E);//Another WO register...
 731         uint16 vdb = tom_word_read(0xF00046);
 732 //      uint16 endingLine =
 733 //Note: This is the *definite* end of the display, though VDE *might* be less than this...
 734 //      uint16 vbb = tom_word_read(0xF00040);
 735 //It seems that they mean it when they say that VDE is the end of object processing.
 736 //However, we need to be able to tell the OP (or TOM) that we've reached the end of the
 737 //buffer and not to write any more pixels...
 738         uint16 vde = tom_word_read(0xF00048);
 739
 740 /*extern int effect_start;
 741 if (effect_start)
 742 {
 743         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);
 744 }//*/
 745
 746         for(uint16 i=0; i<vp; i++)
 747         {
 748                 // Increment the horizontal count (why? RNG?)
 749                 tom_word_write(0xF00004, tom_word_read(0xF00004) + 1);
 750
 751                 tom_word_write(0xF00006, i);                            // Write the VC
 752
 753                 if (i == vi)                                                            // Time for Vertical Interrupt?
 754                 {
 755                         if (tom_irq_enabled(IRQ_VBLANK) && jaguar_interrupt_handler_is_valid(64))
 756                         {
 757                                 // We don't have to worry about autovectors & whatnot because the Jaguar
 758                                 // tells you through registers who sent the interrupt...
 759                                 tom_set_pending_video_int();
 760                                 m68k_set_irq(7);
 761                         }
 762                 }
 763
 764 //              uint32 invalid_instruction_address = s68000exec(m68k_cycles_per_scanline);
 765 //              if (invalid_instruction_address != 0x80000000)
 766 //                      cd_bios_process(invalid_instruction_address);
 767                 // These are divided by 2 because we're executing *half* lines...!
 768                 m68k_execute(m68k_cycles_per_scanline / 2);
 769                 // No CD handling... !!! FIX !!!
 770                 cd_bios_exec(i);        // NOTE: Ignores parameter...
 771                 tom_pit_exec(m68k_cycles_per_scanline / 2);
 772                 jerry_pit_exec(m68k_cycles_per_scanline / 2);
 773                 jerry_i2s_exec(m68k_cycles_per_scanline / 2);
 774                 gpu_exec(gpu_cycles_per_scanline / 2);
 775                 if (dsp_enabled)
 776                         dsp_exec(dsp_cycles_per_scanline / 2);
 777
 778 //Interlacing is still not handled correctly here...
 779                 if (i >= vdb && i < vde)//vbb)
 780                 {
 781                         if (!(i & 0x01))                                                // Execute OP only on even lines (non-interlaced only!)
 782                         {
 783                                 tom_exec_scanline(backbuffer, i/2, render);     // i/2 is a kludge...
 784                                 backbuffer += TOMGetSDLScreenPitch() / 2;       // Convert bytes to words...
 785                         }
 786                 }
 787         }
 788
 789 //#ifdef SOUND_OUTPUT
 790 //      system_sound_update();
 791 //#endif
 792 }
 793
 794 // Temp debugging stuff
 795
 796 void DumpMainMemory(void)
 797 {
 798         FILE * fp = fopen("./memdump.bin", "wb");
 799
 800         if (fp == NULL)
 801                 return;
 802
 803         fwrite(jaguar_mainRam, 1, 0x400000, fp);
 804         fclose(fp);
 805 }
 806
 807 uint8 * GetRamPtr(void)
 808 {
 809         return jaguar_mainRam;
 810 }