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         BiosBooted = FALSE;
  73         if (!Config.HLE) {
  74                 psxExecuteBios();
  75                 if (psxRegs.pc == 0x80030000 && !Config.SlowBoot)
  76                         BiosBootBypass();
  77         }
  78
  79 #ifdef EMU_LOG
  80         EMU_LOG("*BIOS END*\n");
  81 #endif
  82         Log = 0;
  83 }
  84
  85 void psxShutdown() {
  86         psxBiosShutdown();
  87
  88         psxCpu->Shutdown();
  89
  90         psxMemShutdown();
  91 }
  92
  93 // cp0 is passed separately for lightrec to be less messy
  94 void psxException(u32 code, u32 bd, psxCP0Regs *cp0) {
  95         psxRegs.code = PSXMu32(psxRegs.pc);
  96
  97         if (!Config.HLE && ((((psxRegs.code) >> 24) & 0xfe) == 0x4a)) {
  98                 // "hokuto no ken" / "Crash Bandicot 2" ...
  99                 // BIOS does not allow to return to GTE instructions
 100                 // (just skips it, supposedly because it's scheduled already)
 101                 // so we execute it here
 102                 psxCP2Regs *cp2 = (void *)(cp0 + 1);
 103                 psxCP2[psxRegs.code & 0x3f](cp2);
 104         }
 105
 106         // Set the Cause
 107         cp0->n.Cause = (cp0->n.Cause & 0x300) | code;
 108
 109         // Set the EPC & PC
 110         if (bd) {
 111 #ifdef PSXCPU_LOG
 112                 PSXCPU_LOG("bd set!!!\n");
 113 #endif
 114                 cp0->n.Cause |= 0x80000000;
 115                 cp0->n.EPC = (psxRegs.pc - 4);
 116         } else
 117                 cp0->n.EPC = (psxRegs.pc);
 118
 119         if (cp0->n.Status & 0x400000)
 120                 psxRegs.pc = 0xbfc00180;
 121         else
 122                 psxRegs.pc = 0x80000080;
 123
 124         // Set the Status
 125         cp0->n.Status = (cp0->n.Status & ~0x3f) | ((cp0->n.Status & 0x0f) << 2);
 126
 127         if (Config.HLE) psxBiosException();
 128 }
 129
 130 void psxBranchTest() {
 131         if ((psxRegs.cycle - psxNextsCounter) >= psxNextCounter)
 132                 psxRcntUpdate();
 133
 134         if (psxRegs.interrupt) {
 135                 if ((psxRegs.interrupt & (1 << PSXINT_SIO))) { // sio
 136                         if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_SIO].sCycle) >= psxRegs.intCycle[PSXINT_SIO].cycle) {
 137                                 psxRegs.interrupt &= ~(1 << PSXINT_SIO);
 138                                 sioInterrupt();
 139                         }
 140                 }
 141                 if (psxRegs.interrupt & (1 << PSXINT_CDR)) { // cdr
 142                         if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_CDR].sCycle) >= psxRegs.intCycle[PSXINT_CDR].cycle) {
 143                                 psxRegs.interrupt &= ~(1 << PSXINT_CDR);
 144                                 cdrInterrupt();
 145                         }
 146                 }
 147                 if (psxRegs.interrupt & (1 << PSXINT_CDREAD)) { // cdr read
 148                         if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_CDREAD].sCycle) >= psxRegs.intCycle[PSXINT_CDREAD].cycle) {
 149                                 psxRegs.interrupt &= ~(1 << PSXINT_CDREAD);
 150                                 cdrPlayReadInterrupt();
 151                         }
 152                 }
 153                 if (psxRegs.interrupt & (1 << PSXINT_GPUDMA)) { // gpu dma
 154                         if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_GPUDMA].sCycle) >= psxRegs.intCycle[PSXINT_GPUDMA].cycle) {
 155                                 psxRegs.interrupt &= ~(1 << PSXINT_GPUDMA);
 156                                 gpuInterrupt();
 157                         }
 158                 }
 159                 if (psxRegs.interrupt & (1 << PSXINT_MDECOUTDMA)) { // mdec out dma
 160                         if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_MDECOUTDMA].sCycle) >= psxRegs.intCycle[PSXINT_MDECOUTDMA].cycle) {
 161                                 psxRegs.interrupt &= ~(1 << PSXINT_MDECOUTDMA);
 162                                 mdec1Interrupt();
 163                         }
 164                 }
 165                 if (psxRegs.interrupt & (1 << PSXINT_SPUDMA)) { // spu dma
 166                         if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_SPUDMA].sCycle) >= psxRegs.intCycle[PSXINT_SPUDMA].cycle) {
 167                                 psxRegs.interrupt &= ~(1 << PSXINT_SPUDMA);
 168                                 spuInterrupt();
 169                         }
 170                 }
 171                 if (psxRegs.interrupt & (1 << PSXINT_MDECINDMA)) { // mdec in
 172                         if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_MDECINDMA].sCycle) >= psxRegs.intCycle[PSXINT_MDECINDMA].cycle) {
 173                                 psxRegs.interrupt &= ~(1 << PSXINT_MDECINDMA);
 174                                 mdec0Interrupt();
 175                         }
 176                 }
 177                 if (psxRegs.interrupt & (1 << PSXINT_GPUOTCDMA)) { // gpu otc
 178                         if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_GPUOTCDMA].sCycle) >= psxRegs.intCycle[PSXINT_GPUOTCDMA].cycle) {
 179                                 psxRegs.interrupt &= ~(1 << PSXINT_GPUOTCDMA);
 180                                 gpuotcInterrupt();
 181                         }
 182                 }
 183                 if (psxRegs.interrupt & (1 << PSXINT_CDRDMA)) { // cdrom
 184                         if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_CDRDMA].sCycle) >= psxRegs.intCycle[PSXINT_CDRDMA].cycle) {
 185                                 psxRegs.interrupt &= ~(1 << PSXINT_CDRDMA);
 186                                 cdrDmaInterrupt();
 187                         }
 188                 }
 189                 if (psxRegs.interrupt & (1 << PSXINT_CDRLID)) { // cdr lid states
 190                         if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_CDRLID].sCycle) >= psxRegs.intCycle[PSXINT_CDRLID].cycle) {
 191                                 psxRegs.interrupt &= ~(1 << PSXINT_CDRLID);
 192                                 cdrLidSeekInterrupt();
 193                         }
 194                 }
 195                 if (psxRegs.interrupt & (1 << PSXINT_SPU_UPDATE)) { // scheduled spu update
 196                         if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_SPU_UPDATE].sCycle) >= psxRegs.intCycle[PSXINT_SPU_UPDATE].cycle) {
 197                                 psxRegs.interrupt &= ~(1 << PSXINT_SPU_UPDATE);
 198                                 spuUpdate();
 199                         }
 200                 }
 201         }
 202
 203         if (psxHu32(0x1070) & psxHu32(0x1074)) {
 204                 if ((psxRegs.CP0.n.Status & 0x401) == 0x401) {
 205 #ifdef PSXCPU_LOG
 206                         PSXCPU_LOG("Interrupt: %x %x\n", psxHu32(0x1070), psxHu32(0x1074));
 207 #endif
 208 //                      SysPrintf("Interrupt (%x): %x %x\n", psxRegs.cycle, psxHu32(0x1070), psxHu32(0x1074));
 209                         psxException(0x400, 0, &psxRegs.CP0);
 210                 }
 211         }
 212 }
 213
 214 void psxJumpTest() {
 215         if (!Config.HLE && Config.PsxOut) {
 216                 u32 call = psxRegs.GPR.n.t1 & 0xff;
 217                 switch (psxRegs.pc & 0x1fffff) {
 218                         case 0xa0:
 219 #ifdef PSXBIOS_LOG
 220                                 if (call != 0x28 && call != 0xe) {
 221                                         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); }
 222 #endif
 223                                 if (biosA0[call])
 224                                         biosA0[call]();
 225                                 break;
 226                         case 0xb0:
 227 #ifdef PSXBIOS_LOG
 228                                 if (call != 0x17 && call != 0xb) {
 229                                         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); }
 230 #endif
 231                                 if (biosB0[call])
 232                                         biosB0[call]();
 233                                 break;
 234                         case 0xc0:
 235 #ifdef PSXBIOS_LOG
 236                                 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);
 237 #endif
 238                                 if (biosC0[call])
 239                                         biosC0[call]();
 240                                 break;
 241                 }
 242         }
 243 }
 244
 245 void psxExecuteBios() {
 246         int i;
 247         for (i = 0; psxRegs.pc != 0x80030000 && i < 5000000; i++)
 248                 psxCpu->ExecuteBlock();
 249         if (psxRegs.pc == 0x80030000)
 250                 BiosBooted = TRUE;
 251         else
 252                 SysPrintf("BIOS boot timeout - custom BIOS?\n");
 253 }
 254