1 /***************************************************************************
2 * Copyright (C) 2007 Ryan Schultz, PCSX-df Team, PCSX team *
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. *
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. *
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 ***************************************************************************/
21 * R3000A CPU functions.
28 #include "psxinterpreter.h"
29 #include "../include/compiler_features.h"
31 R3000Acpu *psxCpu = NULL;
37 SysPrintf(_("Running PCSX Version %s (%s).\n"), PCSX_VERSION, __DATE__);
40 if (Config.Cpu == CPU_INTERPRETER) {
42 } else psxCpu = &psxRec;
44 Config.Cpu = CPU_INTERPRETER;
50 if (psxMemInit() == -1) return -1;
52 return psxCpu->Init();
58 memset(&psxRegs, 0, sizeof(psxRegs));
60 psxRegs.pc = 0xbfc00000; // Start in bootstrap
62 psxRegs.CP0.n.SR = 0x10600000; // COP0 enabled | BEV = 1 | TS = 1
63 psxRegs.CP0.n.PRid = 0x00000002; // PRevID = Revision ID, same as R3000A
65 psxRegs.CP0.n.SR |= 1u << 30; // COP2 enabled
67 psxCpu->ApplyConfig();
73 BiosLikeGPUSetup(); // a bit of a hack but whatever
77 if (psxRegs.pc == 0x80030000 && !Config.SlowBoot)
82 EMU_LOG("*BIOS END*\n");
95 // cp0 is passed separately for lightrec to be less messy
96 void psxException(u32 cause, enum R3000Abdt bdt, psxCP0Regs *cp0) {
97 u32 opcode = intFakeFetch(psxRegs.pc);
99 if (unlikely(!Config.HLE && (opcode >> 25) == 0x25)) {
100 // "hokuto no ken" / "Crash Bandicot 2" ...
101 // BIOS does not allow to return to GTE instructions
102 // (just skips it, supposedly because it's scheduled already)
103 // so we execute it here
104 psxCP2Regs *cp2 = (psxCP2Regs *)(cp0 + 1);
105 psxRegs.code = opcode;
106 psxCP2[opcode & 0x3f](cp2);
110 cp0->n.Cause = (bdt << 30) | (cp0->n.Cause & 0x300) | cause;
113 cp0->n.EPC = bdt ? psxRegs.pc - 4 : psxRegs.pc;
115 if (cp0->n.SR & 0x400000)
116 psxRegs.pc = 0xbfc00180;
118 psxRegs.pc = 0x80000080;
121 cp0->n.SR = (cp0->n.SR & ~0x3f) | ((cp0->n.SR & 0x0f) << 2);
124 void psxBranchTest() {
125 if ((psxRegs.cycle - psxNextsCounter) >= psxNextCounter)
128 if (psxRegs.interrupt) {
129 if ((psxRegs.interrupt & (1 << PSXINT_SIO))) { // sio
130 if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_SIO].sCycle) >= psxRegs.intCycle[PSXINT_SIO].cycle) {
131 psxRegs.interrupt &= ~(1 << PSXINT_SIO);
135 if (psxRegs.interrupt & (1 << PSXINT_CDR)) { // cdr
136 if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_CDR].sCycle) >= psxRegs.intCycle[PSXINT_CDR].cycle) {
137 psxRegs.interrupt &= ~(1 << PSXINT_CDR);
141 if (psxRegs.interrupt & (1 << PSXINT_CDREAD)) { // cdr read
142 if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_CDREAD].sCycle) >= psxRegs.intCycle[PSXINT_CDREAD].cycle) {
143 psxRegs.interrupt &= ~(1 << PSXINT_CDREAD);
144 cdrPlayReadInterrupt();
147 if (psxRegs.interrupt & (1 << PSXINT_GPUDMA)) { // gpu dma
148 if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_GPUDMA].sCycle) >= psxRegs.intCycle[PSXINT_GPUDMA].cycle) {
149 psxRegs.interrupt &= ~(1 << PSXINT_GPUDMA);
153 if (psxRegs.interrupt & (1 << PSXINT_MDECOUTDMA)) { // mdec out dma
154 if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_MDECOUTDMA].sCycle) >= psxRegs.intCycle[PSXINT_MDECOUTDMA].cycle) {
155 psxRegs.interrupt &= ~(1 << PSXINT_MDECOUTDMA);
159 if (psxRegs.interrupt & (1 << PSXINT_SPUDMA)) { // spu dma
160 if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_SPUDMA].sCycle) >= psxRegs.intCycle[PSXINT_SPUDMA].cycle) {
161 psxRegs.interrupt &= ~(1 << PSXINT_SPUDMA);
165 if (psxRegs.interrupt & (1 << PSXINT_MDECINDMA)) { // mdec in
166 if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_MDECINDMA].sCycle) >= psxRegs.intCycle[PSXINT_MDECINDMA].cycle) {
167 psxRegs.interrupt &= ~(1 << PSXINT_MDECINDMA);
171 if (psxRegs.interrupt & (1 << PSXINT_GPUOTCDMA)) { // gpu otc
172 if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_GPUOTCDMA].sCycle) >= psxRegs.intCycle[PSXINT_GPUOTCDMA].cycle) {
173 psxRegs.interrupt &= ~(1 << PSXINT_GPUOTCDMA);
177 if (psxRegs.interrupt & (1 << PSXINT_CDRDMA)) { // cdrom
178 if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_CDRDMA].sCycle) >= psxRegs.intCycle[PSXINT_CDRDMA].cycle) {
179 psxRegs.interrupt &= ~(1 << PSXINT_CDRDMA);
183 if (psxRegs.interrupt & (1 << PSXINT_CDRLID)) { // cdr lid states
184 if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_CDRLID].sCycle) >= psxRegs.intCycle[PSXINT_CDRLID].cycle) {
185 psxRegs.interrupt &= ~(1 << PSXINT_CDRLID);
186 cdrLidSeekInterrupt();
189 if (psxRegs.interrupt & (1 << PSXINT_SPU_UPDATE)) { // scheduled spu update
190 if ((psxRegs.cycle - psxRegs.intCycle[PSXINT_SPU_UPDATE].sCycle) >= psxRegs.intCycle[PSXINT_SPU_UPDATE].cycle) {
191 psxRegs.interrupt &= ~(1 << PSXINT_SPU_UPDATE);
197 if (psxHu32(0x1070) & psxHu32(0x1074)) {
198 if ((psxRegs.CP0.n.SR & 0x401) == 0x401) {
200 PSXCPU_LOG("Interrupt: %x %x\n", psxHu32(0x1070), psxHu32(0x1074));
202 // SysPrintf("Interrupt (%x): %x %x\n", psxRegs.cycle, psxHu32(0x1070), psxHu32(0x1074));
203 psxException(0x400, 0, &psxRegs.CP0);
209 if (!Config.HLE && Config.PsxOut) {
210 u32 call = psxRegs.GPR.n.t1 & 0xff;
211 switch (psxRegs.pc & 0x1fffff) {
214 if (call != 0x28 && call != 0xe) {
215 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 if (call != 0x17 && call != 0xb) {
223 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 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);
239 void psxExecuteBios() {
241 for (i = 0; i < 5000000; i++) {
242 psxCpu->ExecuteBlock(EXEC_CALLER_BOOT);
243 if ((psxRegs.pc & 0xff800000) == 0x80000000)
246 if (psxRegs.pc != 0x80030000)
247 SysPrintf("non-standard BIOS detected (%d, %08x)\n", i, psxRegs.pc);