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r3000a.c

/***************************************************************************
 *   Copyright (C) 2007 Ryan Schultz, PCSX-df Team, PCSX team              *
 *   schultz.ryan@gmail.com, http://rschultz.ath.cx/code.php               *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/

/*
* R3000A CPU functions.
*/

#include "r3000a.h"

psxRegisters psxRegs;

int psxInit() {

      psxCpu = &psxInt;
#if defined(__x86_64__) || defined(__i386__) || defined(__sh__) || defined(__ppc__)
      if (!Config.Cpu) psxCpu = &psxRec;
#endif
      Log=0;

      if (psxMemInit() == -1) return -1;

      return psxCpu->Init();
}

void psxReset() {
      psxCpu->Reset();

      psxMemReset();

      memset(&psxRegs, 0, sizeof(psxRegs));

      psxRegs.pc = 0xbfc00000; // Start in bootstrap

      psxRegs.CP0.r[12] = 0x10900000; // COP0 enabled | BEV = 1 | TS = 1
      psxRegs.CP0.r[15] = 0x00000002; // PRevID = Revision ID, same as R3000A

      psxHwReset();
      psxBiosInit();

      if (!Config.HLE) psxExecuteBios();

#ifdef EMU_LOG
      EMU_LOG("*BIOS END*\n");
#endif
      Log=0;
}

void psxShutdown() {
      psxMemShutdown();
      psxBiosShutdown();

      psxCpu->Shutdown();
}

void psxException(u32 code, u32 bd) {
      // Set the Cause
      psxRegs.CP0.n.Cause = code;

      // Set the EPC & PC
      if (bd) {
#ifdef PSXCPU_LOG
            PSXCPU_LOG("bd set!!!\n");
#endif
            SysPrintf("bd set!!!\n");
            psxRegs.CP0.n.Cause|= 0x80000000;
            psxRegs.CP0.n.EPC = (psxRegs.pc - 4);
      } else
            psxRegs.CP0.n.EPC = (psxRegs.pc);

      if (psxRegs.CP0.n.Status & 0x400000)
            psxRegs.pc = 0xbfc00180;
      else
            psxRegs.pc = 0x80000080;

      // Set the Status
      psxRegs.CP0.n.Status = (psxRegs.CP0.n.Status &~0x3f) |
                                      ((psxRegs.CP0.n.Status & 0xf) << 2);

      if (!Config.HLE && (((PSXMu32(psxRegs.CP0.n.EPC) >> 24) & 0xfe) == 0x4a)) {
            // "hokuto no ken" / "Crash Bandicot 2" ... fix
            PSXMu32ref(psxRegs.CP0.n.EPC)&= SWAPu32(~0x02000000);
      }

      if (Config.HLE) psxBiosException();
}

void psxBranchTest() {
      if ((psxRegs.cycle - psxNextsCounter) >= psxNextCounter)
            psxRcntUpdate();

      if (psxRegs.interrupt) {
            if ((psxRegs.interrupt & 0x80) && (!Config.Sio)) { // sio
                  if ((psxRegs.cycle - psxRegs.intCycle[7]) >= psxRegs.intCycle[7+1]) {
                        psxRegs.interrupt&=~0x80;
                        sioInterrupt();
                  }
            }
            if (psxRegs.interrupt & 0x04) { // cdr
                  if ((psxRegs.cycle - psxRegs.intCycle[2]) >= psxRegs.intCycle[2+1]) {
                        psxRegs.interrupt&=~0x04;
                        cdrInterrupt();
                  }
            }
            if (psxRegs.interrupt & 0x040000) { // cdr read
                  if ((psxRegs.cycle - psxRegs.intCycle[2+16]) >= psxRegs.intCycle[2+16+1]) {
                        psxRegs.interrupt&=~0x040000;
                        cdrReadInterrupt();
                  }
            }
            if (psxRegs.interrupt & 0x01000000) { // gpu dma
                  if ((psxRegs.cycle - psxRegs.intCycle[3+24]) >= psxRegs.intCycle[3+24+1]) {
                        psxRegs.interrupt&=~0x01000000;
                        gpuInterrupt();
                  }
            }
            if (psxRegs.interrupt & 0x02000000) { // mdec out dma
                  if ((psxRegs.cycle - psxRegs.intCycle[5+24]) >= psxRegs.intCycle[5+24+1]) {
                        psxRegs.interrupt&=~0x02000000;
                        mdec1Interrupt();
                  }
            }

            if (psxRegs.interrupt & 0x80000000) {
                  psxRegs.interrupt&=~0x80000000;
                  psxTestHWInts();
            }
      }
//    if (psxRegs.cycle > 0xd29c6500) Log=1;
}

void psxTestHWInts() {
      if (psxHu32(0x1070) & psxHu32(0x1074)) {
            if ((psxRegs.CP0.n.Status & 0x401) == 0x401) {
#ifdef PSXCPU_LOG
                  PSXCPU_LOG("Interrupt: %x %x\n", psxHu32(0x1070), psxHu32(0x1074));
#endif
//                SysPrintf("Interrupt (%x): %x %x\n", psxRegs.cycle, psxHu32(0x1070), psxHu32(0x1074));
                  psxException(0x400, 0);
            }
      }
}

void psxJumpTest() {
      if (!Config.HLE && Config.PsxOut) {
            u32 call = psxRegs.GPR.n.t1 & 0xff;
            switch (psxRegs.pc & 0x1fffff) {
                  case 0xa0:
#ifdef PSXBIOS_LOG
                        if (call != 0x28 && call != 0xe) {
                              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); }
#endif
                        if (biosA0[call])
                              biosA0[call]();
                        break;
                  case 0xb0:
#ifdef PSXBIOS_LOG
                        if (call != 0x17 && call != 0xb) {
                              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); }
#endif
                        if (biosB0[call])
                              biosB0[call]();
                        break;
                  case 0xc0:
#ifdef PSXBIOS_LOG
                        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);
#endif
                        if (biosC0[call])
                              biosC0[call]();
                        break;
            }
      }
}

void psxExecuteBios() {
      while (psxRegs.pc != 0x80030000)
            psxCpu->ExecuteBlock();
}


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