src/cdrom.cpp

   1 //
   2 // CD handler
   3 //
   4 // Originally by David Raingeard
   5 // GCC/SDL port by Niels Wagenaar (Linux/WIN32) and Caz (BeOS)
   6 // Extensive rewrites/cleanups/fixes by James Hammons
   7 // (C) 2010 Underground Software
   8 //
   9 // JLH = James Hammons <jlhamm@acm.org>
  10 //
  11 // Who  When        What
  12 // ---  ----------  ------------------------------------------------------------
  13 // JLH  01/16/2010  Created this log ;-)
  14 //
  15
  16 #include "cdrom.h"
  17
  18 #include <string.h>                                                                     // For memset, etc.
  19 //#include "jaguar.h"                                                                   // For GET32/SET32 macros
  20 //#include "m68k.h"     //???
  21 //#include "memory.h"
  22 #include "cdintf.h"                                                                     // System agnostic CD interface functions
  23 #include "log.h"
  24 #include "dac.h"
  25
  26 //#define CDROM_LOG                                                                     // For CDROM logging, obviously
  27
  28 /*
  29 BUTCH     equ  $DFFF00          ; base of Butch=interrupt control register, R/W
  30 DSCNTRL   equ  BUTCH+4          ; DSA control register, R/W
  31 DS_DATA   equ  BUTCH+$A         ; DSA TX/RX data, R/W
  32 I2CNTRL   equ  BUTCH+$10        ; i2s bus control register, R/W
  33 SBCNTRL   equ  BUTCH+$14        ; CD subcode control register, R/W
  34 SUBDATA   equ  BUTCH+$18        ; Subcode data register A
  35 SUBDATB   equ  BUTCH+$1C        ; Subcode data register B
  36 SB_TIME   equ  BUTCH+$20        ; Subcode time and compare enable (D24)
  37 FIFO_DATA equ  BUTCH+$24        ; i2s FIFO data
  38 I2SDAT1   equ  BUTCH+$24        ; i2s FIFO data
  39 I2SDAT2   equ  BUTCH+$28        ; i2s FIFO data
  40           equ  BUTCH+$2C        ; CD EEPROM interface
  41
  42 ;
  43 ; Butch's hardware registers
  44 ;
  45 ;BUTCH     equ  $DFFF00         ;base of Butch=interrupt control register, R/W
  46 ;
  47 ;  When written (Long):
  48 ;
  49 ;  bit0 - set to enable interrupts
  50 ;  bit1 - enable CD data FIFO half full interrupt
  51 ;  bit2 - enable CD subcode frame-time interrupt (@ 2x spped = 7ms.)
  52 ;  bit3 - enable pre-set subcode time-match found interrupt
  53 ;  bit4 - CD module command transmit buffer empty interrupt
  54 ;  bit5 - CD module command receive buffer full
  55 ;  bit6 - CIRC failure interrupt
  56 ;
  57 ;  bit7-31  reserved, set to 0
  58 ;
  59 ;  When read (Long):
  60 ;
  61 ;  bit0-8 reserved
  62 ;
  63 ;  bit9  - CD data FIFO half-full flag pending
  64 ;  bit10 - Frame pending
  65 ;  bit11 - Subcode data pending
  66 ;  bit12 - Command to CD drive pending (trans buffer empty if 1)
  67 ;  bit13 - Response from CD drive pending (rec buffer full if 1)
  68 ;  bit14 - CD uncorrectable data error pending
  69 ;
  70 ;   Offsets from BUTCH
  71 ;
  72 O_DSCNTRL   equ  4              ; DSA control register, R/W
  73 O_DS_DATA   equ  $A             ; DSA TX/RX data, R/W
  74 ;
  75 O_I2CNTRL   equ  $10            ; i2s bus control register, R/W
  76 ;
  77 ;  When read:
  78 ;
  79 ;  b0 - I2S data from drive is ON if 1
  80 ;  b1 - I2S path to Jerry is ON if 1
  81 ;  b2 - reserved
  82 ;  b3 - host bus width is 16 if 1, else 32
  83 ;  b4 - FIFO state is not empty if 1
  84 ;
  85 O_SBCNTRL   equ  $14            ; CD subcode control register, R/W
  86 O_SUBDATA   equ  $18            ; Subcode data register A
  87 O_SUBDATB   equ  $1C            ; Subcode data register B
  88 O_SB_TIME   equ  $20            ; Subcode time and compare enable (D24)
  89 O_FIFODAT   equ  $24            ; i2s FIFO data
  90 O_I2SDAT2   equ  $28            ; i2s FIFO data (old)
  91 */
  92
  93 /*
  94 Commands sent through DS_DATA:
  95
  96 $01nn - ? Play track nn ? Seek to track nn ?
  97 $0200 - Stop CD
  98 $03nn - Read session nn TOC (short)
  99 $0400 - Pause CD
 100 $0500 - Unpause CD
 101 $10nn - Goto (min?)
 102 $11nn - Goto (sec?)
 103 $12nn - Goto (frm?)
 104 $14nn - Read session nn TOC (full)
 105 $15nn - Set CD mode
 106 $18nn - Spin up CD to session nn
 107 $5000 - ?
 108 $5100 - Mute CD (audio mode only)
 109 $51FF - Unmute CD (audio mode only)
 110 $5400 - Read # of sessions on CD
 111 $70nn - Set oversampling mode
 112
 113 Commands send through serial bus:
 114
 115 $100 - ? Acknowledge ? (Erase/Write disable)
 116 $130 - ? (Seems to always prefix the $14n commands) (Erase/Write enable)
 117 $140 - Returns ACK (1) (Write to NVRAM?) (Write selected register)
 118 $141 - Returns ACK (1)
 119 $142 - Returns ACK (1)
 120 $143 - Returns ACK (1)
 121 $144 - Returns ACK (1)
 122 $145 - Returns ACK (1)
 123 $180 - Returns 16-bit value (NVRAM?) (read from EEPROM)
 124 $181 - Returns 16-bit value
 125 $182 - Returns 16-bit value
 126 $183 - Returns 16-bit value
 127 $184 - Returns 16-bit value
 128 $185 - Returns 16-bit value
 129
 130 ;  The BUTCH interface for the CD-ROM module is a long-word register,
 131 ;   where only the least signifigant 4 bits are used
 132 ;
 133 eeprom  equ     $DFFF2c                 ;interface to CD-eeprom
 134 ;
 135 ;  bit3 - busy if 0 after write cmd, or Data In after read cmd
 136 ;  bit2 - Data Out
 137 ;  bit1 - clock
 138 ;  bit0 - Chip Select (CS)
 139 ;
 140 ;
 141 ;   Commands specific to the National Semiconductor NM93C14
 142 ;
 143 ;
 144 ;  9-bit commands..
 145 ;                        876543210
 146 eREAD   equ     %110000000              ;read from EEPROM
 147 eEWEN   equ     %100110000              ;Erase/write Enable
 148 eERASE  equ     %111000000              ;Erase selected register
 149 eWRITE  equ     %101000000              ;Write selected register
 150 eERAL   equ     %100100000              ;Erase all registers
 151 eWRAL   equ     %100010000              ;Writes all registers
 152 eEWDS   equ     %100000000              ;Erase/Write disable (default)
 153
 154 So... are there $40 words of memory? 128 bytes?
 155
 156 */
 157
 158 // Private function prototypes
 159
 160 static void CDROMBusWrite(uint16_t);
 161 static uint16_t CDROMBusRead(void);
 162
 163 #define BUTCH           0x00                            // base of Butch == interrupt control register, R/W
 164 #define DSCNTRL         BUTCH + 0x04            // DSA control register, R/W
 165 #define DS_DATA         BUTCH + 0x0A            // DSA TX/RX data, R/W
 166 #define I2CNTRL         BUTCH + 0x10            // i2s bus control register, R/W
 167 #define SBCNTRL         BUTCH + 0x14            // CD subcode control register, R/W
 168 #define SUBDATA         BUTCH + 0x18            // Subcode data register A
 169 #define SUBDATB         BUTCH + 0x1C            // Subcode data register B
 170 #define SB_TIME         BUTCH + 0x20            // Subcode time and compare enable (D24)
 171 #define FIFO_DATA       BUTCH + 0x24            // i2s FIFO data
 172 #define I2SDAT2         BUTCH + 0x28            // i2s FIFO data (old)
 173 #define UNKNOWN         BUTCH + 0x2C            // Seems to be some sort of I2S interface
 174
 175 const char * BReg[12] = { "BUTCH", "DSCNTRL", "DS_DATA", "???", "I2CNTRL",
 176         "SBCNTRL", "SUBDATA", "SUBDATB", "SB_TIME", "FIFO_DATA", "I2SDAT2",
 177         "UNKNOWN" };
 178 //extern const char * whoName[9];
 179
 180
 181 static uint8_t cdRam[0x100];
 182 static uint16_t cdCmd = 0, cdPtr = 0;
 183 static bool haveCDGoodness;
 184 static uint32_t min, sec, frm, block;
 185 static uint8_t cdBuf[2352 + 96];
 186 static uint32_t cdBufPtr = 2352;
 187 //Also need to set up (save/restore) the CD's NVRAM
 188
 189
 190 //extern bool GetRawTOC(void);
 191 void CDROMInit(void)
 192 {
 193         haveCDGoodness = CDIntfInit();
 194
 195 //GetRawTOC();
 196 /*uint8_t buf[2448];
 197 uint32_t sec = 18667 - 150;
 198 memset(buf, 0, 2448);
 199 if (!CDIntfReadBlock(sec, buf))
 200 {
 201         WriteLog("CDROM: Attempt to read with subchannel data failed!\n");
 202         return;
 203 }
 204
 205 //24x98+96
 206 //96=4x24=4x4x6
 207 WriteLog("\nCDROM: Read sector %u...\n\n", sec);
 208 for(int i=0; i<98; i++)
 209 {
 210         WriteLog("%04X: ", i*24);
 211         for(int j=0; j<24; j++)
 212         {
 213                 WriteLog("%02X ", buf[j + (i*24)]);
 214         }
 215         WriteLog("\n");
 216 }
 217 WriteLog("\nRaw P-W subchannel data:\n\n");
 218 for(int i=0; i<6; i++)
 219 {
 220         WriteLog("%02X: ", i*16);
 221         for(int j=0; j<16; j++)
 222         {
 223                 WriteLog("%02X ", buf[2352 + j + (i*16)]);
 224         }
 225         WriteLog("\n");
 226 }
 227 WriteLog("\nP subchannel data: ");
 228 for(int i=0; i<96; i+=8)
 229 {
 230         uint8_t b = 0;
 231         for(int j=0; j<8; j++)
 232                 b |= ((buf[2352 + i + j] & 0x80) >> 7) << (7 - j);
 233
 234         WriteLog("%02X ", b);
 235 }
 236 WriteLog("\nQ subchannel data: ");
 237 for(int i=0; i<96; i+=8)
 238 {
 239         uint8_t b = 0;
 240         for(int j=0; j<8; j++)
 241                 b |= ((buf[2352 + i + j] & 0x40) >> 6) << (7 - j);
 242
 243         WriteLog("%02X ", b);
 244 }
 245 WriteLog("\n\n");//*/
 246 }
 247
 248 void CDROMReset(void)
 249 {
 250         memset(cdRam, 0x00, 0x100);
 251         cdCmd = 0;
 252 }
 253
 254 void CDROMDone(void)
 255 {
 256         CDIntfDone();
 257 }
 258
 259
 260 //
 261 // This approach is probably wrong, but let's do it for now.
 262 // What's needed is a complete overhaul of the interrupt system so that
 263 // interrupts are handled as they're generated--instead of the current
 264 // scheme where they're handled on scanline boundaries.
 265 //
 266 void BUTCHExec(uint32_t cycles)
 267 {
 268 #if 1
 269 // We're chickening out for now...
 270 return;
 271 #else
 272 //      extern uint8_t * jerry_ram_8;                                   // Hmm.
 273
 274         // For now, we just do the FIFO interrupt. Timing is also likely to be WRONG as well.
 275         uint32_t cdState = GET32(cdRam, BUTCH);
 276
 277         if (!(cdState & 0x01))                                          // No BUTCH interrupts enabled
 278                 return;
 279
 280         if (!(cdState & 0x22))
 281                 return;                                                                 // For now, we only handle FIFO/buffer full interrupts...
 282
 283         // From what I can make out, it seems that each FIFO is 32 bytes long
 284
 285 //      DSPSetIRQLine(DSPIRQ_EXT, ASSERT_LINE);
 286 //I'm *sure* this is wrong--prolly need to generate DSP IRQs as well!
 287         if (jerry_ram_8[0x23] & 0x3F)                           // Only generate an IRQ if enabled!
 288                 GPUSetIRQLine(GPUIRQ_DSP, ASSERT_LINE);
 289 #endif
 290 }
 291
 292
 293 //
 294 // CD-ROM memory access functions
 295 //
 296
 297 uint8_t CDROMReadByte(uint32_t offset, uint32_t who/*=UNKNOWN*/)
 298 {
 299 #ifdef CDROM_LOG
 300         if ((offset & 0xFF) < 12 * 4)
 301                 WriteLog("[%s] ", BReg[(offset & 0xFF) / 4]);
 302         WriteLog("CDROM: %s reading byte $%02X from $%08X [68K PC=$%08X]\n", whoName[who], offset, cdRam[offset & 0xFF], m68k_get_reg(NULL, M68K_REG_PC));
 303 #endif
 304         return cdRam[offset & 0xFF];
 305 }
 306
 307 static uint8_t trackNum = 1, minTrack, maxTrack;
 308 //static uint8_t minutes[16] = {  0,  0,  2,  5,  7, 10, 12, 15, 17, 20, 22, 25, 27, 30, 32, 35 };
 309 //static uint8_t seconds[16] = {  0,  0, 30,  0, 30,  0, 30,  0, 30,  0, 30,  0, 30,  0, 30,  0 };
 310 //static uint8_t frames[16]  = {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0 };
 311 //static uint16_t sd = 0;
 312 uint16_t CDROMReadWord(uint32_t offset, uint32_t who/*=UNKNOWN*/)
 313 {
 314         offset &= 0xFF;
 315
 316         uint16_t data = 0x0000;
 317
 318         if (offset == BUTCH)
 319                 data = 0x0000;
 320         else if (offset == BUTCH + 2)
 321 // We need to fix this so it's not as brain-dead as it is now--i.e., make it so that when
 322 // a command is sent to the CDROM, we control here whether or not it succeeded or whether
 323 // the command is still being carried out, etc.
 324
 325 // bit12 - Command to CD drive pending (trans buffer empty if 1)
 326 // bit13 - Response from CD drive pending (rec buffer full if 1)
 327 //              data = (haveCDGoodness ? 0x3000 : 0x0000);      // DSA RX Interrupt pending bit (0 = pending)
 328 //This only returns ACKs for interrupts that are set:
 329 //This doesn't work for the initial code that writes $180000 to BUTCH. !!! FIX !!!
 330                 data = (haveCDGoodness ? cdRam[BUTCH + 3] << 8 : 0x0000);
 331 //      else if (offset == SUBDATA + 2)
 332 //              data = sd++ | 0x0010;                                           // Have no idea what this is...
 333         else if (offset == DS_DATA && haveCDGoodness)
 334         {
 335                 if ((cdCmd & 0xFF00) == 0x0100)                         // ???
 336                 {
 337 //Not sure how to acknowledge the ???...
 338 //                      data = 0x0400;//?? 0x0200;
 339                         cdPtr++;
 340                         switch (cdPtr)
 341                         {
 342                         case 1:
 343                                 data = 0x0000;
 344                                 break;
 345                         case 2:
 346                                 data = 0x0100;
 347                                 break;
 348                         case 3:
 349                                 data = 0x0200;
 350                                 break;
 351                         case 4:
 352                                 data = 0x0300;
 353                                 break;
 354                         case 5:
 355                                 data = 0x0400;
 356                         }//*/
 357                         WriteLog("CDROM: Reading DS_DATA (???), cdCmd=$%04X\n", cdCmd);
 358                 }
 359                 else if ((cdCmd & 0xFF00) == 0x0200)                    // Stop CD
 360                 {
 361 //Not sure how to acknowledge the stop...
 362                         data = 0x0400;//?? 0x0200;
 363 /*                      cdPtr++;
 364                         switch (cdPtr)
 365                         {
 366                         case 1:
 367                                 data = 0x00FF;
 368                                 break;
 369                         case 2:
 370                                 data = 0x01FF;
 371                                 break;
 372                         case 3:
 373                                 data = 0x02FF;
 374                                 break;
 375                         case 4:
 376                                 data = 0x03FF;
 377                                 break;
 378                         case 5:
 379                                 data = 0x0400;
 380                         }//*/
 381                         WriteLog("CDROM: Reading DS_DATA (stop), cdCmd=$%04X\n", cdCmd);
 382                 }
 383                 else if ((cdCmd & 0xFF00) == 0x0300)            // Read session TOC (overview?)
 384                 {
 385
 386 /*
 387 TOC: [Sess] [adrCtl] [?] [point] [?] [?] [?] [?] [pmin] [psec] [pframe]
 388 TOC: 1 10 00 a0 00:00:00 00 01:00:00
 389 TOC: 1 10 00 a1 00:00:00 00 01:00:00
 390 TOC: 1 10 00 a2 00:00:00 00 03:42:42
 391 TOC: 1 10 00  1 00:00:00 00 00:02:00   <-- Track #1
 392 TOC: 1 50 00 b0 06:12:42 02 79:59:74
 393 TOC: 1 50 00 c0 128:00:32 00 97:18:06
 394 TOC: 2 10 00 a0 00:00:00 00 02:00:00
 395 TOC: 2 10 00 a1 00:00:00 00 11:00:00
 396 TOC: 2 10 00 a2 00:00:00 00 54:32:18
 397 TOC: 2 10 00  2 00:00:00 00 06:14:42   <-- Track #2
 398 TOC: 2 10 00  3 00:00:00 00 06:24:42   <-- Track #3
 399 TOC: 2 10 00  4 00:00:00 00 17:42:00   <-- Track #4
 400 TOC: 2 10 00  5 00:00:00 00 22:26:15   <-- Track #5
 401 TOC: 2 10 00  6 00:00:00 00 29:50:16   <-- Track #6
 402 TOC: 2 10 00  7 00:00:00 00 36:01:49   <-- Track #7
 403 TOC: 2 10 00  8 00:00:00 00 40:37:59   <-- Track #8
 404 TOC: 2 10 00  9 00:00:00 00 45:13:70   <-- Track #9
 405 TOC: 2 10 00  a 00:00:00 00 49:50:06   <-- Track #10
 406 TOC: 2 10 00  b 00:00:00 00 54:26:17   <-- Track #11
 407 */
 408
 409 //Should do something like so:
 410 //                      data = GetSessionInfo(cdCmd & 0xFF, cdPtr);
 411                         data = CDIntfGetSessionInfo(cdCmd & 0xFF, cdPtr);
 412                         if (data == 0xFF)       // Failed...
 413                         {
 414                                 data = 0x0400;
 415                                 WriteLog("CDROM: Requested invalid session #%u (or failed to load TOC, or bad cdPtr value)\n", cdCmd & 0xFF);
 416                         }
 417                         else
 418                         {
 419                                 data |= (0x20 | cdPtr++) << 8;
 420                                 WriteLog("CDROM: Reading DS_DATA (session #%u TOC byte #%u): $%04X\n", cdCmd & 0xFF, cdPtr, data);
 421                         }
 422
 423 /*                      bool isValidSession = ((cdCmd & 0xFF) == 0 ? true : false);//Hardcoded... !!! FIX !!!
 424 //NOTE: This should return error condition if the requested session doesn't exist! ($0400?)
 425                         if (isValidSession)
 426                         {
 427                                 cdPtr++;
 428                                 switch (cdPtr)
 429                                 {
 430                                 case 1:
 431                                         data = 0x2001;  // Min track for this session?
 432                                         break;
 433                                 case 2:
 434                                         data = 0x210A;  // Max track for this session?
 435                                         break;
 436                                 case 3:
 437                                         data = 0x2219;  // Max lead-out time, absolute minutes
 438                                         break;
 439                                 case 4:
 440                                         data = 0x2319;  // Max lead-out time, absolute seconds
 441                                         break;
 442                                 case 5:
 443                                         data = 0x2419;  // Max lead-out time, absolute frames
 444                                         break;
 445                                 default:
 446                                         data = 0xFFFF;
 447
 448 //;    +0 - unused, reserved (0)
 449 //;    +1 - unused, reserved (0)
 450 //;    +2 - minimum track number
 451 //;    +3 - maximum track number
 452 //;    +4 - total number of sessions
 453 //;    +5 - start of last lead-out time, absolute minutes
 454 //;    +6 - start of last lead-out time, absolute seconds
 455 //;    +7 - start of last lead-out time, absolute frames
 456
 457                                 }
 458                                 WriteLog("CDROM: Reading DS_DATA (session #%u TOC byte #%u): $%04X\n", cdCmd & 0xFF, cdPtr, data);
 459                         }
 460                         else
 461                         {
 462                                 data = 0x0400;
 463                                 WriteLog("CDROM: Requested invalid session #%u\n", cdCmd & 0xFF);
 464                         }*/
 465                 }
 466                 // Seek to m, s, or f position
 467                 else if ((cdCmd & 0xFF00) == 0x1000 || (cdCmd & 0xFF00) == 0x1100 || (cdCmd & 0xFF00) == 0x1200)
 468                         data = 0x0100;  // Success, though this doesn't take error handling into account.
 469                         // Ideally, we would also set the bits in BUTCH to let the processor know that
 470                         // this is ready to be read... !!! FIX !!!
 471                 else if ((cdCmd & 0xFF00) == 0x1400)            // Read "full" session TOC
 472                 {
 473 //Need to be a bit more tricky here, since it's reading the "session" TOC instead of the
 474 //full TOC--so we need to check for the min/max tracks for each session here... [DONE]
 475
 476                         if (trackNum > maxTrack)
 477                         {
 478                                 data = 0x400;
 479 WriteLog("CDROM: Requested invalid track #%u for session #%u\n", trackNum, cdCmd & 0xFF);
 480                         }
 481                         else
 482                         {
 483                                 if (cdPtr < 0x62)
 484                                         data = (cdPtr << 8) | trackNum;
 485                                 else if (cdPtr < 0x65)
 486                                         data = (cdPtr << 8) | CDIntfGetTrackInfo(trackNum, (cdPtr - 2) & 0x0F);
 487
 488 WriteLog("CDROM: Reading DS_DATA (session #%u, full TOC byte #%u): $%04X\n", cdCmd & 0xFF, (cdPtr+1) & 0x0F, data);
 489
 490                                 cdPtr++;
 491                                 if (cdPtr == 0x65)
 492                                         cdPtr = 0x60, trackNum++;
 493                         }
 494
 495                         // Note that it seems to return track info in sets of 4 (or is it 5?)
 496 /*
 497 ;    +0 - track # (must be non-zero)
 498 ;    +1 - absolute minutes (0..99), start of track
 499 ;    +2 - absolute seconds (0..59), start of track
 500 ;    +3 - absolute frames, (0..74), start of track
 501 ;    +4 - session # (0..99)
 502 ;    +5 - track duration minutes
 503 ;    +6 - track duration seconds
 504 ;    +7 - track duration frames
 505 */
 506                         // Seems to be the following format: $60xx -> Track #xx
 507                         //                                   $61xx -> min?   (trk?)
 508                         //                                   $62xx -> sec?   (min?)
 509                         //                                   $63xx -> frame? (sec?)
 510                         //                                   $64xx -> ?      (frame?)
 511 /*                      cdPtr++;
 512                         switch (cdPtr)
 513                         {
 514                         case 1:
 515                                 data = 0x6000 | trackNum;       // Track #
 516                                 break;
 517                         case 2:
 518                                 data = 0x6100 | trackNum;       // Track # (again?)
 519                                 break;
 520                         case 3:
 521                                 data = 0x6200 | minutes[trackNum];      // Minutes
 522                                 break;
 523                         case 4:
 524                                 data = 0x6300 | seconds[trackNum];      // Seconds
 525                                 break;
 526                         case 5:
 527                                 data = 0x6400 | frames[trackNum];               // Frames
 528                                 trackNum++;
 529                                 cdPtr = 0;
 530                         }//*/
 531                 }
 532                 else if ((cdCmd & 0xFF00) == 0x1500)            // Read CD mode
 533                 {
 534                         data = cdCmd | 0x0200;  // ?? not sure ?? [Seems OK]
 535                         WriteLog("CDROM: Reading DS_DATA (mode), cdCmd=$%04X\n", cdCmd);
 536                 }
 537                 else if ((cdCmd & 0xFF00) == 0x1800)            // Spin up session #
 538                 {
 539                         data = cdCmd;
 540                         WriteLog("CDROM: Reading DS_DATA (spin up session), cdCmd=$%04X\n", cdCmd);
 541                 }
 542                 else if ((cdCmd & 0xFF00) == 0x5400)            // Read # of sessions
 543                 {
 544                         data = cdCmd | 0x00;    // !!! Hardcoded !!! FIX !!!
 545                         WriteLog("CDROM: Reading DS_DATA (# of sessions), cdCmd=$%04X\n", cdCmd);
 546                 }
 547                 else if ((cdCmd & 0xFF00) == 0x7000)            // Read oversampling
 548                 {
 549 //NOTE: This setting will probably affect the # of DSP interrupts that need to happen. !!! FIX !!!
 550                         data = cdCmd;
 551                         WriteLog("CDROM: Reading DS_DATA (oversampling), cdCmd=$%04X\n", cdCmd);
 552                 }
 553                 else
 554                 {
 555                         data = 0x0400;
 556                         WriteLog("CDROM: Reading DS_DATA, unhandled cdCmd=$%04X\n", cdCmd);
 557                 }
 558         }
 559         else if (offset == DS_DATA && !haveCDGoodness)
 560                 data = 0x0400;                                                          // No CD interface present, so return error
 561         else if (offset >= FIFO_DATA && offset <= FIFO_DATA + 3)
 562         {
 563         }
 564         else if (offset >= FIFO_DATA + 4 && offset <= FIFO_DATA + 7)
 565         {
 566         }
 567         else
 568                 data = GET16(cdRam, offset);
 569
 570 //Returning $00000008 seems to cause it to use the starfield. Dunno why.
 571 // It looks like it's getting the CD_mode this way...
 572 //Temp, for testing...
 573 //Very interesting...! Seems to control sumthin' or other...
 574 /*if (offset == 0x2C || offset == 0x2E)
 575         data = 0xFFFF;//*/
 576 /*if (offset == 0x2C)
 577         data = 0x0000;
 578 if (offset == 0x2E)
 579         data = 0;//0x0008;//*/
 580         if (offset == UNKNOWN + 2)
 581                 data = CDROMBusRead();
 582
 583 #ifdef CDROM_LOG
 584         if ((offset & 0xFF) < 11 * 4)
 585                 WriteLog("[%s] ", BReg[(offset & 0xFF) / 4]);
 586         if (offset != UNKNOWN && offset != UNKNOWN + 2)
 587                 WriteLog("CDROM: %s reading word $%04X from $%08X [68K PC=$%08X]\n", whoName[who], data, offset, m68k_get_reg(NULL, M68K_REG_PC));
 588 #endif
 589         return data;
 590 }
 591
 592 void CDROMWriteByte(uint32_t offset, uint8_t data, uint32_t who/*=UNKNOWN*/)
 593 {
 594         offset &= 0xFF;
 595         cdRam[offset] = data;
 596
 597 #ifdef CDROM_LOG
 598         if ((offset & 0xFF) < 12 * 4)
 599                 WriteLog("[%s] ", BReg[(offset & 0xFF) / 4]);
 600         WriteLog("CDROM: %s writing byte $%02X at $%08X [68K PC=$%08X]\n", whoName[who], data, offset, m68k_get_reg(NULL, M68K_REG_PC));
 601 #endif
 602 }
 603
 604 void CDROMWriteWord(uint32_t offset, uint16_t data, uint32_t who/*=UNKNOWN*/)
 605 {
 606         offset &= 0xFF;
 607         SET16(cdRam, offset, data);
 608
 609         // Command register
 610 //Lesse what this does... Seems to work OK...!
 611         if (offset == DS_DATA)
 612         {
 613                 cdCmd = data;
 614                 if ((data & 0xFF00) == 0x0200)                          // Stop CD
 615                 {
 616                         cdPtr = 0;
 617                         WriteLog("CDROM: Stopping CD\n", data & 0xFF);
 618                 }
 619                 else if ((data & 0xFF00) == 0x0300)                     // Read session TOC (short? overview?)
 620                 {
 621                         cdPtr = 0;
 622                         WriteLog("CDROM: Reading TOC for session #%u\n", data & 0xFF);
 623                 }
 624 //Not sure how these three acknowledge...
 625                 else if ((data & 0xFF00) == 0x1000)                     // Seek to minute position
 626                 {
 627                         min = data & 0x00FF;
 628                 }
 629                 else if ((data & 0xFF00) == 0x1100)                     // Seek to second position
 630                 {
 631                         sec = data & 0x00FF;
 632                 }
 633                 else if ((data & 0xFF00) == 0x1200)                     // Seek to frame position
 634                 {
 635                         frm = data & 0x00FF;
 636                         block = (((min * 60) + sec) * 75) + frm;
 637                         cdBufPtr = 2352;                                                // Ensure that SSI read will do so immediately
 638                         WriteLog("CDROM: Seeking to %u:%02u:%02u [block #%u]\n", min, sec, frm, block);
 639                 }
 640                 else if ((data & 0xFF00) == 0x1400)                     // Read "full" TOC for session
 641                 {
 642                         cdPtr = 0x60,
 643                         minTrack = CDIntfGetSessionInfo(data & 0xFF, 0),
 644                         maxTrack = CDIntfGetSessionInfo(data & 0xFF, 1);
 645                         trackNum = minTrack;
 646                         WriteLog("CDROM: Reading \"full\" TOC for session #%u (min=%u, max=%u)\n", data & 0xFF, minTrack, maxTrack);
 647                 }
 648                 else if ((data & 0xFF00) == 0x1500)                     // Set CDROM mode
 649                 {
 650                         // Mode setting is as follows: bit 0 set -> single speed, bit 1 set -> double,
 651                         // bit 3 set -> multisession CD, bit 3 unset -> audio CD
 652                         WriteLog("CDROM: Setting mode $%02X\n", data & 0xFF);
 653                 }
 654                 else if ((data & 0xFF00) == 0x1800)                     // Spin up session #
 655                 {
 656                         WriteLog("CDROM: Spinning up session #%u\n", data & 0xFF);
 657                 }
 658                 else if ((data & 0xFF00) == 0x5400)                     // Read # of sessions
 659                 {
 660                         WriteLog("CDROM: Reading # of sessions\n", data & 0xFF);
 661                 }
 662                 else if ((data & 0xFF00) == 0x7000)                     // Set oversampling rate
 663                 {
 664                         // 1 = none, 2 = 2x, 3 = 4x, 4 = 8x
 665                         uint32_t rates[5] = { 0, 1, 2, 4, 8 };
 666                         WriteLog("CDROM: Setting oversample rate to %uX\n", rates[(data & 0xFF)]);
 667                 }
 668                 else
 669                         WriteLog("CDROM: Unknown command $%04X\n", data);
 670         }//*/
 671
 672         if (offset == UNKNOWN + 2)
 673                 CDROMBusWrite(data);
 674
 675 #ifdef CDROM_LOG
 676         if ((offset & 0xFF) < 11 * 4)
 677                 WriteLog("[%s] ", BReg[(offset & 0xFF) / 4]);
 678         if (offset != UNKNOWN && offset != UNKNOWN + 2)
 679                 WriteLog("CDROM: %s writing word $%04X at $%08X [68K PC=$%08X]\n", whoName[who], data, offset, m68k_get_reg(NULL, M68K_REG_PC));
 680 #endif
 681 }
 682
 683 //
 684 // State machine for sending/receiving data along a serial bus
 685 //
 686
 687 enum ButchState { ST_INIT, ST_RISING, ST_FALLING };
 688 static ButchState currentState = ST_INIT;
 689 static uint16_t counter = 0;
 690 static bool cmdTx = false;
 691 static uint16_t busCmd;
 692 static uint16_t rxData, txData;
 693 static uint16_t rxDataBit;
 694 static bool firstTime = false;
 695
 696 static void CDROMBusWrite(uint16_t data)
 697 {
 698 //This is kinda lame. What we should do is check for a 0->1 transition on either bits 0 or 1...
 699 //!!! FIX !!!
 700
 701 #ifdef CDROM_LOG
 702         if (data & 0xFFF0)
 703                 WriteLog("CDROM: BusWrite write on unknown line: $%04X\n", data);
 704 #endif
 705
 706         switch (currentState)
 707         {
 708         case ST_INIT:
 709                 currentState = ST_RISING;
 710                 break;
 711         case ST_RISING:
 712                 if (data & 0x0001)                                                      // Command coming
 713                 {
 714                         cmdTx = true;
 715                         counter = 0;
 716                         busCmd = 0;
 717                 }
 718                 else
 719                 {
 720                         if (cmdTx)
 721                         {
 722                                 busCmd <<= 1;                                           // Make room for next bit
 723                                 busCmd |= (data & 0x04);                        // & put it in
 724                                 counter++;
 725
 726                                 if (counter == 9)
 727                                 {
 728                                         busCmd >>= 2;                                   // Because we ORed bit 2, we need to shift right by 2
 729                                         cmdTx = false;
 730
 731 //What it looks like:
 732 //It seems that the $18x series reads from NVRAM while the
 733 //$130, $14x, $100 series writes values to NVRAM...
 734                                         if (busCmd == 0x180)
 735                                                 rxData = 0x0024;//1234;
 736                                         else if (busCmd == 0x181)
 737                                                 rxData = 0x0004;//5678;
 738                                         else if (busCmd == 0x182)
 739                                                 rxData = 0x0071;//9ABC;
 740                                         else if (busCmd == 0x183)
 741                                                 rxData = 0xFF67;//DEF0;
 742                                         else if (busCmd == 0x184)
 743                                                 rxData = 0xFFFF;//892F;
 744                                         else if (busCmd == 0x185)
 745                                                 rxData = 0xFFFF;//8000;
 746                                         else
 747                                                 rxData = 0x0001;
 748 //                                              rxData = 0x8349;//8000;//0F67;
 749
 750                                         counter = 0;
 751                                         firstTime = true;
 752                                         txData = 0;
 753 #ifdef CDROM_LOG
 754                                         WriteLog("CDROM: *** BusWrite got command $%04X\n", busCmd);
 755 #endif
 756                                 }
 757                         }
 758                         else
 759                         {
 760                                 txData = (txData << 1) | ((data & 0x04) >> 2);
 761 //WriteLog("[%s]", data & 0x04 ? "1" : "0");
 762
 763                                 rxDataBit = (rxData & 0x8000) >> 12;
 764                                 rxData <<= 1;
 765                                 counter++;
 766 #ifdef CDROM_LOG
 767                                 if (counter == 16)
 768                                         WriteLog("CDROM: *** BusWrite got extra command $%04X\n", txData);
 769 #endif
 770                         }
 771                 }
 772
 773                 currentState = ST_FALLING;
 774                 break;
 775         case ST_FALLING:
 776                 currentState = ST_INIT;
 777                 break;
 778         }
 779 }
 780
 781 static uint16_t CDROMBusRead(void)
 782 {
 783 // It seems the counter == 0 simply waits for a single bit acknowledge-- !!! FIX !!!
 784 // Or does it? Hmm. It still "pumps" 16 bits through above, so how is this special?
 785 // Seems to be because it sits and looks at it as if it will change. Dunno!
 786 #ifdef CDROM_LOG
 787         if ((counter & 0x0F) == 0)
 788         {
 789                 if (counter == 0 && rxDataBit == 0)
 790                 {
 791                         if (firstTime)
 792                         {
 793                                 firstTime = false;
 794                                 WriteLog("0...\n");
 795                         }
 796                 }
 797                 else
 798                         WriteLog("%s\n", rxDataBit ? "1" : "0");
 799         }
 800         else
 801                 WriteLog("%s", rxDataBit ? "1" : "0");
 802 #endif
 803
 804         return rxDataBit;
 805 }
 806
 807 //
 808 // This simulates a read from BUTCH over the SSI to JERRY. Uses real reading!
 809 //
 810 //temp, until I can fix my CD image... Argh!
 811 static uint8_t cdBuf2[2532 + 96], cdBuf3[2532 + 96];
 812 uint16_t GetWordFromButchSSI(uint32_t offset, uint32_t who/*= UNKNOWN*/)
 813 {
 814         bool go = ((offset & 0x0F) == 0x0A || (offset & 0x0F) == 0x0E ? true : false);
 815
 816         if (!go)
 817                 return 0x000;
 818
 819 // The problem comes in here. Really, we should generate the IRQ once we've stuffed
 820 // our values into the DAC L/RRXD ports...
 821 // But then again, the whole IRQ system needs an overhaul in order to make it more
 822 // cycle accurate WRT to the various CPUs. Right now, it's catch-as-catch-can, which
 823 // means that IRQs get serviced on scanline boundaries instead of when they occur.
 824         cdBufPtr += 2;
 825
 826         if (cdBufPtr >= 2352)
 827         {
 828 WriteLog("CDROM: %s reading block #%u...\n", whoName[who], block);
 829                 //No error checking. !!! FIX !!!
 830 //NOTE: We have to subtract out the 1st track start as well (in cdintf_foo.cpp)!
 831 //              CDIntfReadBlock(block - 150, cdBuf);
 832
 833 //Crappy kludge for shitty shit. Lesse if it works!
 834                 CDIntfReadBlock(block - 150, cdBuf2);
 835                 CDIntfReadBlock(block - 149, cdBuf3);
 836                 for(int i=0; i<2352-4; i+=4)
 837                 {
 838                         cdBuf[i+0] = cdBuf2[i+4];
 839                         cdBuf[i+1] = cdBuf2[i+5];
 840                         cdBuf[i+2] = cdBuf2[i+2];
 841                         cdBuf[i+3] = cdBuf2[i+3];
 842                 }
 843                 cdBuf[2348] = cdBuf3[0];
 844                 cdBuf[2349] = cdBuf3[1];
 845                 cdBuf[2350] = cdBuf2[2350];
 846                 cdBuf[2351] = cdBuf2[2351];//*/
 847
 848                 block++, cdBufPtr = 0;
 849         }
 850
 851 /*extern bool doDSPDis;
 852 if (block == 244968)
 853         doDSPDis = true;//*/
 854
 855 WriteLog("[%04X:%01X]", GET16(cdBuf, cdBufPtr), offset & 0x0F);
 856 if (cdBufPtr % 32 == 30)
 857         WriteLog("\n");
 858
 859 //      return GET16(cdBuf, cdBufPtr);
 860 //This probably isn't endian safe...
 861 // But then again... It seems that even though the data on the CD is organized as
 862 // LL LH RL RH the way it expects to see the data is RH RL LH LL.
 863 // D'oh! It doesn't matter *how* the data comes in, since it puts each sample into
 864 // its own left or right side queue, i.e. it reads them 32 bits at a time and puts
 865 // them into their L/R channel queues. It does seem, though, that it expects the
 866 // right channel to be the upper 16 bits and the left to be the lower 16.
 867         return (cdBuf[cdBufPtr + 1] << 8) | cdBuf[cdBufPtr + 0];
 868 }
 869
 870 bool ButchIsReadyToSend(void)
 871 {
 872 #ifdef LOG_CDROM_VERBOSE
 873 WriteLog("Butch is%s ready to send...\n", cdRam[I2CNTRL + 3] & 0x02 ? "" : " not");
 874 #endif
 875         return (cdRam[I2CNTRL + 3] & 0x02 ? true : false);
 876 }
 877
 878 //
 879 // This simulates a read from BUTCH over the SSI to JERRY. Uses real reading!
 880 //
 881 void SetSSIWordsXmittedFromButch(void)
 882 {
 883
 884 // The problem comes in here. Really, we should generate the IRQ once we've stuffed
 885 // our values into the DAC L/RRXD ports...
 886 // But then again, the whole IRQ system needs an overhaul in order to make it more
 887 // cycle accurate WRT to the various CPUs. Right now, it's catch-as-catch-can, which
 888 // means that IRQs get serviced on scanline boundaries instead of when they occur.
 889
 890 // NOTE: The CD BIOS uses the following SMODE:
 891 //       DAC: M68K writing to SMODE. Bits: WSEN FALLING  [68K PC=00050D8C]
 892         cdBufPtr += 4;
 893
 894         if (cdBufPtr >= 2352)
 895         {
 896 WriteLog("CDROM: Reading block #%u...\n", block);
 897                 //No error checking. !!! FIX !!!
 898 //NOTE: We have to subtract out the 1st track start as well (in cdintf_foo.cpp)!
 899 //              CDIntfReadBlock(block - 150, cdBuf);
 900
 901 //Crappy kludge for shitty shit. Lesse if it works!
 902 //It does! That means my CD is WRONG! FUCK!
 903
 904 // But, then again, according to Belboz at AA the two zeroes in front *ARE* necessary...
 905 // So that means my CD is OK, just this method is wrong!
 906 // It all depends on whether or not the interrupt occurs on the RISING or FALLING edge
 907 // of the word strobe... !!! FIX !!!
 908
 909 // When WS rises, left channel was done transmitting. When WS falls, right channel is done.
 910 //              CDIntfReadBlock(block - 150, cdBuf2);
 911 //              CDIntfReadBlock(block - 149, cdBuf3);
 912                 CDIntfReadBlock(block, cdBuf2);
 913                 CDIntfReadBlock(block + 1, cdBuf3);
 914                 memcpy(cdBuf, cdBuf2 + 2, 2350);
 915                 cdBuf[2350] = cdBuf3[0];
 916                 cdBuf[2351] = cdBuf3[1];//*/
 917
 918                 block++, cdBufPtr = 0;
 919
 920 /*extern bool doDSPDis;
 921 static int foo = 0;
 922 if (block == 244968)
 923 {
 924         foo++;
 925 WriteLog("\n***** foo = %u, block = %u *****\n\n", foo, block);
 926         if (foo == 2)
 927                 doDSPDis = true;
 928 }//*/
 929         }
 930
 931
 932 WriteLog("[%02X%02X %02X%02X]", cdBuf[cdBufPtr+1], cdBuf[cdBufPtr+0], cdBuf[cdBufPtr+3], cdBuf[cdBufPtr+2]);
 933 if (cdBufPtr % 32 == 28)
 934         WriteLog("\n");
 935
 936 //This probably isn't endian safe...
 937 // But then again... It seems that even though the data on the CD is organized as
 938 // LL LH RL RH the way it expects to see the data is RH RL LH LL.
 939 // D'oh! It doesn't matter *how* the data comes in, since it puts each sample into
 940 // its own left or right side queue, i.e. it reads them 32 bits at a time and puts
 941 // them into their L/R channel queues. It does seem, though, that it expects the
 942 // right channel to be the upper 16 bits and the left to be the lower 16.
 943
 944 // This behavior is strictly a function of *where* the WS creates an IRQ. If the data
 945 // is shifted by two zeroes (00 00 in front of the data file) then this *is* the
 946 // correct behavior, since the left channel will be xmitted followed by the right
 947
 948 // Now we have definitive proof: The MYST CD shows a word offset. So that means we have
 949 // to figure out how to make that work here *without* having to load 2 sectors, offset, etc.
 950 // !!! FIX !!!
 951         lrxd = (cdBuf[cdBufPtr + 3] << 8) | cdBuf[cdBufPtr + 2],
 952         rrxd = (cdBuf[cdBufPtr + 1] << 8) | cdBuf[cdBufPtr + 0];
 953 }
 954
 955 /*
 956 [18667]
 957 TOC for MYST
 958
 959 CDINTF: Disc summary
 960         # of sessions: 2, # of tracks: 10
 961         Session info:
 962         1: min track= 1, max track= 1, lead out= 1:36:67
 963         2: min track= 2, max track=10, lead out=55:24:71
 964         Track info:
 965          1: start= 0:02:00
 966          2: start= 4:08:67
 967          3: start= 4:16:65
 968          4: start= 4:29:19
 969          5: start=29:31:03
 970          6: start=33:38:50
 971          7: start=41:38:60
 972          8: start=44:52:18
 973          9: start=51:51:22
 974         10: start=55:18:73
 975
 976 CDROM: Read sector 18517 (18667 - 150)...
 977
 978 0000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 979 0018: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 980 0030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 981 0048: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 982 0060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 983 0078: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 984 0090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 985 00A8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 986 00C0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 987 00D8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 988 00F0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 989 0108: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 990 0120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 991 0138: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 992 0150: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 993 0168: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 994 0180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 995 0198: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 996 01B0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 997 01C8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 998 01E0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 999 01F8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1000 0210: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1001 0228: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1002 0240: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1003 0258: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1004 0270: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1005 0288: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1006 02A0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1007 02B8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1008 02D0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1009 02E8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1010 0300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1011 0318: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1012 0330: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1013 0348: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1014 0360: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1015 0378: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1016 0390: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1017 03A8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1018 03C0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1019 03D8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1020 03F0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1021 0408: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1022 0420: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1023 0438: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1024 0450: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1025 0468: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1026 0480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1027 0498: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1028 04B0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1029 04C8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1030 04E0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1031 04F8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1032 0510: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1033 0528: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1034 0540: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1035 0558: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1036 0570: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1037 0588: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1038 05A0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1039 05B8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1040 05D0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1041 05E8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1042 0600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1043 0618: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1044 0630: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1045 0648: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1046 0660: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1047 0678: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1048 0690: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1049 06A8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1050 06C0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1051 06D8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1052 06F0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1053 0708: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1054 0720: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1055 0738: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1056 0750: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1057 0768: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1058 0780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1059 0798: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1060 07B0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1061 07C8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00[54 41 49 52]54 41
1062 07E0: 49 52 54 41 49 52 54 41 49 52 54 41 49 52 54 41 49 52 54 41 49 52 54 41
1063 07F8: 49 52 54 41 49 52 54 41 49 52 54 41 49 52 54 41 49 52 54 41 49 52 54 41
1064 0810: 49 52 54 41 49 52[54 41 49 52]54 41 52 41 20 49 50 41 52 50 56 4F 44 45
1065 0828: 44 20 54 41 20 41 45 48 44 41 52 45 41 20 52 54 20 49[00 00 00 50]01 00
1066 0840: 80 83 FC 23 07 00 07 00 F0 00 0C 21 FC 23 07 00 07 00 F1 00 0C A1 FC 33
1067 0858: FF FF F0 00 4E 00 7C 2E 1F 00 FC FF 00 61 08 00 F9 4E 00 00 00 51 E7 48
1068 0870: 00 FE 39 30 F1 00 02 40 40 02 10 00 00 67 1C 00 79 42 01 00 8C D3 3C 34
1069 0888: 37 03 3C 30 81 05 3C 3C 0A 01 3C 38 F1 00 00 60 1A 00 FC 33 01 00 01 00
1070 08A0: 8C D3 3C 34 4B 03 3C 30 65 05 3C 3C 42 01 3C 38 1F 01 C0 33 01 00 88 D3
1071 08B8: C4 33 01 00 8A D3 00 32 41 E2 41 94 7C D4 04 00 7C 92 01 00 41 00 00 04
1072 08D0: C1 33 01 00 82 D3 C1 33 F0 00 3C 00 C2 33 01 00 80 D3 C2 33 F0 00 38 00
1073 08E8: C2 33 F0 00 3A 00 06 3A 44 9A C5 33 01 00 84 D3 44 DC C6 33 01 00 86 D3
1074 0900: F9 33 01 00 84 D3 F0 00 46 00 FC 33 FF FF F0 00 48 00 FC 23 00 00 00 00
1075 0918: F0 00 2A 00 FC 33 00 00 F0 00 58 00 DF 4C 7F 00 75 4E 00 00 00 00 00 00
1076
1077 Raw P-W subchannel data:
1078
1079 00: 80 80 C0 80 80 80 80 C0 80 80 80 80 80 80 C0 80
1080 10: 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80
1081 20: 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 C0
1082 30: 80 80 80 80 80 80 80 80 80 80 80 80 80 C0 80 80
1083 40: 80 80 80 80 C0 80 80 80 80 C0 C0 80 80 C0 C0 80
1084 50: C0 80 80 C0 C0 C0 80 80 C0 80 80 80 C0 80 80 80
1085
1086 P subchannel data: FF FF FF FF FF FF FF FF FF FF FF FF
1087 Q subchannel data: 21 02 00 00 00 01 00 04 08 66 9C 88
1088
1089 Run address: $5000, Length: $18380
1090 */
1091
1092
1093 /*
1094 CD_read function from the CD BIOS: Note that it seems to direct the EXT1 interrupt
1095 to the GPU--so that would mean *any* interrupt that BUTCH generates would be routed
1096 to the GPU...
1097
1098 read:
1099                 btst.l  #31,d0
1100                 bne.w   .play
1101                 subq.l  #4,a0           ; Make up for ISR pre-increment
1102                 move.l  d0,-(sp)
1103                 move.l  BUTCH,d0
1104                 and.l   #$ffff0000,d0
1105                 move.l  d0,BUTCH        ; NO INTERRUPTS!!!!!!!!!!!
1106                 move.l  (sp)+,d0
1107 ;               move.l  #0,BUTCH
1108
1109                 move.w  #$101,J_INT
1110
1111                 move.l  d1,-(sp)
1112                 move.l  I2CNTRL,d1      ;Read I2S Control Register
1113                 bclr    #2,d1           ; Stop data
1114                 move.l  d1,I2CNTRL
1115                 move.l  (sp)+,d1
1116
1117                 move.l  PTRLOC,a2
1118                 move.l  a0,(a2)+
1119                 move.l  a1,(a2)+
1120                 move.l  #0,(a2)+
1121
1122                 btst.b  #7,INITTYPE
1123                 beq     .not_bad
1124                 move.l  PTRLOC,a0
1125                 asl.l   #5,d2
1126
1127                 move.l  d2,-(sp)
1128
1129                 or.l    #$089a3c1a,d2           ; These instructions include the bclr
1130                 move.l  d2,188(a0)
1131
1132                 move.l  (sp)+,d2
1133
1134                 swap    d2
1135                 or.l    #$3c1a1838,d2           ; These instructions include the bclr
1136                 move.l  d2,196(a0)
1137
1138                 move.l  #16,(a2)+
1139                 move.l  d1,(a2)
1140
1141 .not_bad:
1142
1143                 move.w  DS_DATA,d1                      ; Clear any pending DSARX states
1144                 move.l  I2CNTRL,d1                      ; Clear any pending errors
1145
1146 ; Drain the FIFO so that we don't get overloaded
1147
1148 .dump:
1149                 move.l  FIFO_DATA,d1
1150                 move.l  I2CNTRL,d1
1151                 btst    #4,d1
1152                 bne.b   .dump
1153
1154 .butch_go:
1155                 move.l  BUTCH,d1
1156                 and.l   #$FFFF0000,d1
1157                 or.l    #%000100001,d1                   ;Enable DSARX interrupt
1158                 move.l  d1,BUTCH
1159 ;               move.l  #%000100001,BUTCH                ;Enable DSARX interrupt
1160
1161 ; Do a play @
1162
1163 .play:  move.l  d0,d1           ; mess with copy in d1
1164                 lsr.l   #8,d1           ; shift the byte over
1165                 lsr.w   #8,d1
1166                 or.w    #$1000,d1       ; format it for goto
1167                 move.w  d1,DS_DATA      ; DSA tx
1168         bsr.b   DSA_tx
1169
1170                 move.l  d0,d1           ; mess with copy in d1
1171                 lsr.w   #8,d1
1172                 or.w    #$1100,d1       ; format it for goto
1173                 move.w  d1,DS_DATA      ; DSA tx
1174         bsr.b   DSA_tx
1175
1176                 move.l  d0,d1           ; mess with copy in d1
1177                 and.w   #$00FF,d1       ; mask for minutes
1178                 or.w    #$1200,d1       ; format it for goto
1179                 move.w  d1,DS_DATA      ; DSA tx
1180         bsr.b   DSA_tx
1181
1182                 rts
1183
1184
1185 ****************************
1186 * Here's the GPU interrupt *
1187 ****************************
1188
1189 JERRY_ISR:
1190         movei   #G_FLAGS,r30
1191         load    (r30),r29               ;read the flags
1192
1193         movei   #BUTCH,r24
1194
1195 make_ptr:
1196         move    pc,Ptrloc
1197         movei   #(make_ptr-PTRPOS),TEMP
1198         sub     TEMP,Ptrloc
1199
1200 HERE:
1201         move    pc,r25
1202         movei   #(EXIT_ISR-HERE),r27
1203         add     r27,r25
1204
1205 ; Is this a DSARX interrupt?
1206
1207         load    (r24),r27               ;check for DSARX int pending
1208         btst    #13,r27
1209         jr      z,fifo_read                     ; This should ALWAYS fall thru the first time
1210
1211 ; Set the match bit, to allow data
1212 ;       moveq   #3,r26                  ; enable FIFO only
1213 ; Don't just jam a value
1214 ; Clear the DSARX and set FIFO
1215         bclr    #5,r27
1216         bset    #1,r27
1217         store   r27,(r24)
1218         addq    #$10,r24
1219         load    (r24),r27
1220         bset    #2,r27
1221         store   r27,(r24)               ; Disable SUBCODE match
1222
1223 ; Now we clear the DSARX interrupt in Butch
1224
1225         subq    #12,r24                 ; does what the above says
1226         load    (r24),r26               ;Clears DSA pending interrupt
1227         addq    #6,r24
1228         loadw   (r24),r27               ; Read DSA response
1229         btst    #10,r27                 ; Check for error
1230         jr      nz,error
1231         or      r26,r26
1232         jump    (r25)
1233 ;       nop
1234
1235 fifo_read:
1236 ; Check for ERROR!!!!!!!!!!!!!!!!!!!!!
1237         btst    #14,r27
1238         jr      z,noerror
1239         bset    #31,r27
1240 error:
1241         addq    #$10,r24
1242         load    (r24),TEMP
1243         or      TEMP,TEMP
1244         subq    #$10,r24
1245         load    (Ptrloc),TEMP
1246         addq    #8,Ptrloc
1247         store   TEMP,(Ptrloc)
1248         subq    #8,Ptrloc
1249 noerror:
1250         load    (Ptrloc),Dataptr        ;get pointer
1251
1252 ; Check to see if we should stop
1253         addq    #4,Ptrloc
1254         load    (Ptrloc),TEMP
1255         subq    #4,Ptrloc
1256         cmp     Dataptr,TEMP
1257         jr      pl,notend
1258 ;       nop
1259         bclr    #0,r27
1260         store   r27,(r24)
1261
1262 notend:
1263         movei   #FIFO_DATA,CDdata
1264         move    CDdata,r25
1265         addq    #4,CDdata
1266 loptop:
1267         load    (CDdata),TEMP
1268         load    (r25),r30
1269         load    (CDdata),r21
1270         load    (r25),r22
1271         load    (CDdata),r24
1272         load    (r25),r20
1273         load    (CDdata),r19
1274         load    (r25),r18
1275         addq    #4,Dataptr
1276         store   TEMP,(Dataptr)
1277         addqt   #4,Dataptr
1278         store   r30,(Dataptr)
1279         addqt   #4,Dataptr
1280         store   r21,(Dataptr)
1281         addqt   #4,Dataptr
1282         store   r22,(Dataptr)
1283         addqt   #4,Dataptr
1284         store   r24,(Dataptr)
1285         addqt   #4,Dataptr
1286         store   r20,(Dataptr)
1287         addqt   #4,Dataptr
1288         store   r19,(Dataptr)
1289         addqt   #4,Dataptr
1290         store   r18,(Dataptr)
1291
1292         store   Dataptr,(Ptrloc)
1293
1294 exit_isr:
1295         movei   #J_INT,r24      ; Acknowledge in Jerry
1296         moveq   #1,TEMP
1297         bset    #8,TEMP
1298         storew  TEMP,(r24)
1299
1300 .if FLAG
1301 ; Stack r18
1302         load    (r31),r18
1303         addq    #4,r31
1304
1305 ; Stack r19
1306         load    (r31),r19
1307         addq    #4,r31
1308
1309 ; Stack r20
1310         load    (r31),r20
1311         addq    #4,r31
1312
1313 ; Stack r21
1314         load    (r31),r21
1315         addq    #4,r31
1316
1317 ; Stack r22
1318         load    (r31),r22
1319         addq    #4,r31
1320
1321 ; Stack r23
1322         load    (r31),r23
1323         addq    #4,r31
1324
1325 ; Stack r26
1326         load    (r31),r26
1327         addq    #4,r31
1328
1329 ; Stack r27
1330         load    (r31),r27
1331         addq    #4,r31
1332
1333 ; Stack r24
1334         load    (r31),r24
1335         addq    #4,r31
1336
1337 ; Stack r25
1338         load    (r31),r25
1339         addq    #4,r31
1340 .endif
1341
1342         movei   #G_FLAGS,r30
1343
1344 ;r29 already has flags
1345         bclr    #3,r29          ;IMASK
1346         bset    #10,r29         ;Clear DSP int bit in TOM
1347
1348         load    (r31),r28       ;Load return address
1349
1350
1351         addq    #2,r28          ;Fix it up
1352         addq    #4,r31
1353         jump    (r28)           ;Return
1354         store   r29,(r30)       ;Restore broken flags
1355
1356
1357         align long
1358
1359 stackbot:
1360         ds.l    20
1361 STACK:
1362
1363
1364 */
1365