libpcsxcore/r3000a.c

   1 /***************************************************************************
   2  *   Copyright (C) 2007 Ryan Schultz, PCSX-df Team, PCSX team              *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program; if not, write to the                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   51 Franklin Street, Fifth Floor, Boston, MA 02111-1307 USA.           *
  18  ***************************************************************************/
  19
  20 /*
  21 * R3000A CPU functions.
  22 */
  23
  24 #include "r3000a.h"
  25 #include "cdrom.h"
  26 #include "mdec.h"
  27 #include "gte.h"
  28 #include "psxinterpreter.h"
  29
  30 R3000Acpu *psxCpu = NULL;
  31 #ifdef DRC_DISABLE
  32 psxRegisters psxRegs;
  33 #endif
  34
  35 int psxInit() {
  36         SysPrintf(_("Running PCSX Version %s (%s).\n"), PCSX_VERSION, __DATE__);
  37
  38 #ifndef DRC_DISABLE
  39         if (Config.Cpu == CPU_INTERPRETER) {
  40                 psxCpu = &psxInt;
  41         } else psxCpu = &psxRec;
  42 #else
  43         Config.Cpu = CPU_INTERPRETER;
  44         psxCpu = &psxInt;
  45 #endif
  46
  47         Log = 0;
  48
  49         if (psxMemInit() == -1) return -1;
  50
  51         return psxCpu->Init();
  52 }
  53
  54 void psxReset() {
  55         psxMemReset();
  56
  57         memset(&psxRegs, 0, sizeof(psxRegs));
  58
  59         psxRegs.pc = 0xbfc00000; // Start in bootstrap
  60
  61         psxRegs.CP0.r[12] = 0x10900000; // COP0 enabled | BEV = 1 | TS = 1
  62         psxRegs.CP0.r[15] = 0x00000002; // PRevID = Revision ID, same as R3000A
  63
  64         psxCpu->ApplyConfig();
  65         psxCpu->Reset();
  66
  67         psxHwReset();
  68         psxBiosInit();
  69
  70         BiosLikeGPUSetup(); // a bit of a hack but whatever
  71
  72         if (!Config.HLE) {
  73                 psxExecuteBios();
  74                 if (psxRegs.pc == 0x80030000 && !Config.SlowBoot)
  75                         BiosBootBypass();
  76         }
  77
  78 #ifdef EMU_LOG
  79         EMU_LOG("*BIOS END*\n");
  80 #endif
  81         Log = 0;
  82 }
  83
  84 void psxShutdown() {
  85         psxBiosShutdown();
  86
  87         psxCpu->Shutdown();
  88
  89         psxMemShutdown();
  90 }
  91
  92 // cp0 is passed separately for lightrec to be less messy
  93 void psxException(u32 code, u32 bd, psxCP0Regs *cp0) {
  94         psxRegs.code = PSXMu32(psxRegs.pc);
  95
  96         if (!Config.HLE && ((((psxRegs.code) >> 24) & 0xfe) == 0x4a)) {
  97                 // "hokuto no ken" / "Crash Bandicot 2" ...
  98                 // BIOS does not allow to return to GTE instructions
  99                 // (just skips it, supposedly because it's scheduled already)
 100                 // so we execute it here
 101                 psxCP2Regs *cp2 = (void *)(cp0 + 1);
 102                 psxCP2[psxRegs.code & 0x3f](cp2);
 103         }
 104
 105         // Set the Cause
 106         cp0->n.Cause = (cp0->n.Cause & 0x300) | code;
 107
 108         // Set the EPC & PC
 109         if (bd) {
 110 #ifdef PSXCPU_LOG
 111                 PSXCPU_LOG("bd set!!!\n");
 112 #endif
 113                 cp0->n.Cause |= 0x80000000;
 114                 cp0->n.EPC = (psxRegs.pc - 4);
 115         } else
 116                 cp0->n.EPC = (psxRegs.pc);
 117
 118         if (cp0->n.Status & 0x400000)
 119                 psxRegs.pc = 0xbfc00180;
 120         else
 121                 psxRegs.pc = 0x80000080;
 122
 123         // Set the Status
 124         cp0->n.Status = (cp0->n.Status & ~0x3f) | ((cp0->n.Status & 0x0f) << 2);
 125
 126         if (Config.HLE) psxBiosException();
 127 }
 128
 129 void psxBranchTest() {
 130         if ((psxRegs.cycle - psxNextsCounter) >= psxNextCounter)
 131                 psxRcntUpdate();
 132
 133         if (psxRegs.interrupt) {
 134                 if ((psxRegs.interrupt & (1 << PSXINT_SIO))) { // sio
 135                         if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_SIO].sCycle) >= psxRegs.intCycle[PSXINT_SIO].cycle) {
 136                                 psxRegs.interrupt &= ~(1 << PSXINT_SIO);
 137                                 sioInterrupt();
 138                         }
 139                 }
 140                 if (psxRegs.interrupt & (1 << PSXINT_CDR)) { // cdr
 141                         if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_CDR].sCycle) >= psxRegs.intCycle[PSXINT_CDR].cycle) {
 142                                 psxRegs.interrupt &= ~(1 << PSXINT_CDR);
 143                                 cdrInterrupt();
 144                         }
 145                 }
 146                 if (psxRegs.interrupt & (1 << PSXINT_CDREAD)) { // cdr read
 147                         if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_CDREAD].sCycle) >= psxRegs.intCycle[PSXINT_CDREAD].cycle) {
 148                                 psxRegs.interrupt &= ~(1 << PSXINT_CDREAD);
 149                                 cdrPlayReadInterrupt();
 150                         }
 151                 }
 152                 if (psxRegs.interrupt & (1 << PSXINT_GPUDMA)) { // gpu dma
 153                         if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_GPUDMA].sCycle) >= psxRegs.intCycle[PSXINT_GPUDMA].cycle) {
 154                                 psxRegs.interrupt &= ~(1 << PSXINT_GPUDMA);
 155                                 gpuInterrupt();
 156                         }
 157                 }
 158                 if (psxRegs.interrupt & (1 << PSXINT_MDECOUTDMA)) { // mdec out dma
 159                         if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_MDECOUTDMA].sCycle) >= psxRegs.intCycle[PSXINT_MDECOUTDMA].cycle) {
 160                                 psxRegs.interrupt &= ~(1 << PSXINT_MDECOUTDMA);
 161                                 mdec1Interrupt();
 162                         }
 163                 }
 164                 if (psxRegs.interrupt & (1 << PSXINT_SPUDMA)) { // spu dma
 165                         if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_SPUDMA].sCycle) >= psxRegs.intCycle[PSXINT_SPUDMA].cycle) {
 166                                 psxRegs.interrupt &= ~(1 << PSXINT_SPUDMA);
 167                                 spuInterrupt();
 168                         }
 169                 }
 170                 if (psxRegs.interrupt & (1 << PSXINT_MDECINDMA)) { // mdec in
 171                         if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_MDECINDMA].sCycle) >= psxRegs.intCycle[PSXINT_MDECINDMA].cycle) {
 172                                 psxRegs.interrupt &= ~(1 << PSXINT_MDECINDMA);
 173                                 mdec0Interrupt();
 174                         }
 175                 }
 176                 if (psxRegs.interrupt & (1 << PSXINT_GPUOTCDMA)) { // gpu otc
 177                         if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_GPUOTCDMA].sCycle) >= psxRegs.intCycle[PSXINT_GPUOTCDMA].cycle) {
 178                                 psxRegs.interrupt &= ~(1 << PSXINT_GPUOTCDMA);
 179                                 gpuotcInterrupt();
 180                         }
 181                 }
 182                 if (psxRegs.interrupt & (1 << PSXINT_CDRDMA)) { // cdrom
 183                         if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_CDRDMA].sCycle) >= psxRegs.intCycle[PSXINT_CDRDMA].cycle) {
 184                                 psxRegs.interrupt &= ~(1 << PSXINT_CDRDMA);
 185                                 cdrDmaInterrupt();
 186                         }
 187                 }
 188                 if (psxRegs.interrupt & (1 << PSXINT_CDRLID)) { // cdr lid states
 189                         if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_CDRLID].sCycle) >= psxRegs.intCycle[PSXINT_CDRLID].cycle) {
 190                                 psxRegs.interrupt &= ~(1 << PSXINT_CDRLID);
 191                                 cdrLidSeekInterrupt();
 192                         }
 193                 }
 194                 if (psxRegs.interrupt & (1 << PSXINT_SPU_UPDATE)) { // scheduled spu update
 195                         if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_SPU_UPDATE].sCycle) >= psxRegs.intCycle[PSXINT_SPU_UPDATE].cycle) {
 196                                 psxRegs.interrupt &= ~(1 << PSXINT_SPU_UPDATE);
 197                                 spuUpdate();
 198                         }
 199                 }
 200         }
 201
 202         if (psxHu32(0x1070) & psxHu32(0x1074)) {
 203                 if ((psxRegs.CP0.n.Status & 0x401) == 0x401) {
 204 #ifdef PSXCPU_LOG
 205                         PSXCPU_LOG("Interrupt: %x %x\n", psxHu32(0x1070), psxHu32(0x1074));
 206 #endif
 207 //                      SysPrintf("Interrupt (%x): %x %x\n", psxRegs.cycle, psxHu32(0x1070), psxHu32(0x1074));
 208                         psxException(0x400, 0, &psxRegs.CP0);
 209                 }
 210         }
 211 }
 212
 213 void psxJumpTest() {
 214         if (!Config.HLE && Config.PsxOut) {
 215                 u32 call = psxRegs.GPR.n.t1 & 0xff;
 216                 switch (psxRegs.pc & 0x1fffff) {
 217                         case 0xa0:
 218 #ifdef PSXBIOS_LOG
 219                                 if (call != 0x28 && call != 0xe) {
 220                                         PSXBIOS_LOG("Bios call a0: %s (%x) %x,%x,%x,%x\n", biosA0n[call], call, psxRegs.GPR.n.a0, psxRegs.GPR.n.a1, psxRegs.GPR.n.a2, psxRegs.GPR.n.a3); }
 221 #endif
 222                                 if (biosA0[call])
 223                                         biosA0[call]();
 224                                 break;
 225                         case 0xb0:
 226 #ifdef PSXBIOS_LOG
 227                                 if (call != 0x17 && call != 0xb) {
 228                                         PSXBIOS_LOG("Bios call b0: %s (%x) %x,%x,%x,%x\n", biosB0n[call], call, psxRegs.GPR.n.a0, psxRegs.GPR.n.a1, psxRegs.GPR.n.a2, psxRegs.GPR.n.a3); }
 229 #endif
 230                                 if (biosB0[call])
 231                                         biosB0[call]();
 232                                 break;
 233                         case 0xc0:
 234 #ifdef PSXBIOS_LOG
 235                                 PSXBIOS_LOG("Bios call c0: %s (%x) %x,%x,%x,%x\n", biosC0n[call], call, psxRegs.GPR.n.a0, psxRegs.GPR.n.a1, psxRegs.GPR.n.a2, psxRegs.GPR.n.a3);
 236 #endif
 237                                 if (biosC0[call])
 238                                         biosC0[call]();
 239                                 break;
 240                 }
 241         }
 242 }
 243
 244 void psxExecuteBios() {
 245         int i;
 246         for (i = 0; i < 5000000; i++) {
 247                 psxCpu->ExecuteBlock(EXEC_CALLER_BOOT);
 248                 if ((psxRegs.pc & 0xff800000) == 0x80000000)
 249                         break;
 250         }
 251         if (psxRegs.pc != 0x80030000)
 252                 SysPrintf("non-standard BIOS detected (%d, %08x)\n", i, psxRegs.pc);
 253 }
 254