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
  29 R3000Acpu *psxCpu = NULL;
  30 psxRegisters psxRegs;
  31
  32 int psxInit() {
  33         SysPrintf(_("Running PCSX Version %s (%s).\n"), PACKAGE_VERSION, __DATE__);
  34
  35 #ifdef PSXREC
  36         if (Config.Cpu == CPU_INTERPRETER) {
  37                 psxCpu = &psxInt;
  38         } else psxCpu = &psxRec;
  39 #else
  40         psxCpu = &psxInt;
  41 #endif
  42
  43         Log = 0;
  44
  45         if (psxMemInit() == -1) return -1;
  46
  47         return psxCpu->Init();
  48 }
  49
  50 void psxReset() {
  51         psxCpu->Reset();
  52
  53         psxMemReset();
  54
  55         memset(&psxRegs, 0, sizeof(psxRegs));
  56
  57         psxRegs.pc = 0xbfc00000; // Start in bootstrap
  58
  59         psxRegs.CP0.r[12] = 0x10900000; // COP0 enabled | BEV = 1 | TS = 1
  60         psxRegs.CP0.r[15] = 0x00000002; // PRevID = Revision ID, same as R3000A
  61
  62         psxHwReset();
  63         psxBiosInit();
  64
  65         if (!Config.HLE)
  66                 psxExecuteBios();
  67
  68 #ifdef EMU_LOG
  69         EMU_LOG("*BIOS END*\n");
  70 #endif
  71         Log = 0;
  72 }
  73
  74 void psxShutdown() {
  75         psxMemShutdown();
  76         psxBiosShutdown();
  77
  78         psxCpu->Shutdown();
  79 }
  80
  81 void psxException(u32 code, u32 bd) {
  82         // Set the Cause
  83         psxRegs.CP0.n.Cause = code;
  84
  85         // Set the EPC & PC
  86         if (bd) {
  87 #ifdef PSXCPU_LOG
  88                 PSXCPU_LOG("bd set!!!\n");
  89 #endif
  90                 SysPrintf("bd set!!!\n");
  91                 psxRegs.CP0.n.Cause |= 0x80000000;
  92                 psxRegs.CP0.n.EPC = (psxRegs.pc - 4);
  93         } else
  94                 psxRegs.CP0.n.EPC = (psxRegs.pc);
  95
  96         if (psxRegs.CP0.n.Status & 0x400000)
  97                 psxRegs.pc = 0xbfc00180;
  98         else
  99                 psxRegs.pc = 0x80000080;
 100
 101         // Set the Status
 102         psxRegs.CP0.n.Status = (psxRegs.CP0.n.Status &~0x3f) |
 103                                                   ((psxRegs.CP0.n.Status & 0xf) << 2);
 104
 105         if (!Config.HLE && (((PSXMu32(psxRegs.CP0.n.EPC) >> 24) & 0xfe) == 0x4a)) {
 106                 // "hokuto no ken" / "Crash Bandicot 2" ... fix
 107                 PSXMu32ref(psxRegs.CP0.n.EPC)&= SWAPu32(~0x02000000);
 108         }
 109
 110         if (Config.HLE) psxBiosException();
 111 }
 112
 113 void psxBranchTest() {
 114         if ((psxRegs.cycle - psxNextsCounter) >= psxNextCounter)
 115                 psxRcntUpdate();
 116
 117         if (psxRegs.interrupt) {
 118                 if ((psxRegs.interrupt & 0x80) && !Config.Sio) { // sio
 119                         if ((psxRegs.cycle - psxRegs.intCycle[7]) >= psxRegs.intCycle[7 + 1]) {
 120                                 psxRegs.interrupt &= ~0x80;
 121                                 sioInterrupt();
 122                         }
 123                 }
 124                 if (psxRegs.interrupt & 0x04) { // cdr
 125                         if ((psxRegs.cycle - psxRegs.intCycle[2]) >= psxRegs.intCycle[2 + 1]) {
 126                                 psxRegs.interrupt &= ~0x04;
 127                                 cdrInterrupt();
 128                         }
 129                 }
 130                 if (psxRegs.interrupt & 0x040000) { // cdr read
 131                         if ((psxRegs.cycle - psxRegs.intCycle[2 + 16]) >= psxRegs.intCycle[2 + 16 + 1]) {
 132                                 psxRegs.interrupt &= ~0x040000;
 133                                 cdrReadInterrupt();
 134                         }
 135                 }
 136                 if (psxRegs.interrupt & 0x01000000) { // gpu dma
 137                         if ((psxRegs.cycle - psxRegs.intCycle[3 + 24]) >= psxRegs.intCycle[3 + 24 + 1]) {
 138                                 psxRegs.interrupt &= ~0x01000000;
 139                                 gpuInterrupt();
 140                         }
 141                 }
 142                 if (psxRegs.interrupt & 0x02000000) { // mdec out dma
 143                         if ((psxRegs.cycle - psxRegs.intCycle[5 + 24]) >= psxRegs.intCycle[5 + 24 + 1]) {
 144                                 psxRegs.interrupt &= ~0x02000000;
 145                                 mdec1Interrupt();
 146                         }
 147                 }
 148                 if (psxRegs.interrupt & 0x04000000) { // spu dma
 149                         if ((psxRegs.cycle - psxRegs.intCycle[1 + 24]) >= psxRegs.intCycle[1 + 24 + 1]) {
 150                                 psxRegs.interrupt &= ~0x04000000;
 151                                 spuInterrupt();
 152                         }
 153                 }
 154         }
 155
 156         if (psxHu32(0x1070) & psxHu32(0x1074)) {
 157                 if ((psxRegs.CP0.n.Status & 0x401) == 0x401) {
 158 #ifdef PSXCPU_LOG
 159                         PSXCPU_LOG("Interrupt: %x %x\n", psxHu32(0x1070), psxHu32(0x1074));
 160 #endif
 161 //                      SysPrintf("Interrupt (%x): %x %x\n", psxRegs.cycle, psxHu32(0x1070), psxHu32(0x1074));
 162                         psxException(0x400, 0);
 163                 }
 164         }
 165 }
 166
 167 void psxJumpTest() {
 168         if (!Config.HLE && Config.PsxOut) {
 169                 u32 call = psxRegs.GPR.n.t1 & 0xff;
 170                 switch (psxRegs.pc & 0x1fffff) {
 171                         case 0xa0:
 172 #ifdef PSXBIOS_LOG
 173                                 if (call != 0x28 && call != 0xe) {
 174                                         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); }
 175 #endif
 176                                 if (biosA0[call])
 177                                         biosA0[call]();
 178                                 break;
 179                         case 0xb0:
 180 #ifdef PSXBIOS_LOG
 181                                 if (call != 0x17 && call != 0xb) {
 182                                         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); }
 183 #endif
 184                                 if (biosB0[call])
 185                                         biosB0[call]();
 186                                 break;
 187                         case 0xc0:
 188 #ifdef PSXBIOS_LOG
 189                                 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);
 190 #endif
 191                                 if (biosC0[call])
 192                                         biosC0[call]();
 193                                 break;
 194                 }
 195         }
 196 }
 197
 198 void psxExecuteBios() {
 199         while (psxRegs.pc != 0x80030000)
 200                 psxCpu->ExecuteBlock();
 201 }
 202