mirror of https://github.com/PCSX2/pcsx2.git
253 lines
7.0 KiB
C++
253 lines
7.0 KiB
C++
/* PCSX2 - PS2 Emulator for PCs
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* Copyright (C) 2002-2010 PCSX2 Dev Team
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*
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* PCSX2 is free software: you can redistribute it and/or modify it under the terms
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* of the GNU Lesser General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with PCSX2.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "PrecompiledHeader.h"
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#include "IopCommon.h"
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#include "Sio.h"
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#include "Sif.h"
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using namespace R3000A;
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R3000Acpu *psxCpu;
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// used for constant propagation
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u32 g_psxConstRegs[32];
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u32 g_psxHasConstReg, g_psxFlushedConstReg;
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// Controls when branch tests are performed.
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u32 g_iopNextEventCycle = 0;
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// This value is used when the IOP execution is broken to return control to the EE.
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// (which happens when the IOP throws EE-bound interrupts). It holds the value of
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// iopCycleEE (which is set to zero to facilitate the code break), so that the unrun
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// cycles can be accounted for later.
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s32 iopBreak = 0;
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// tracks the IOP's current sync status with the EE. When it dips below zero,
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// control is returned to the EE.
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s32 iopCycleEE = -1;
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// Used to signal to the EE when important actions that need IOP-attention have
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// happened (hsyncs, vsyncs, IOP exceptions, etc). IOP runs code whenever this
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// is true, even if it's already running ahead a bit.
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bool iopEventAction = false;
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bool iopEventTestIsActive = false;
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__aligned16 psxRegisters psxRegs;
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void psxReset()
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{
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memzero(psxRegs);
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psxRegs.pc = 0xbfc00000; // Start in bootstrap
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psxRegs.CP0.n.Status = 0x10900000; // COP0 enabled | BEV = 1 | TS = 1
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psxRegs.CP0.n.PRid = 0x0000001f; // PRevID = Revision ID, same as the IOP R3000A
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iopBreak = 0;
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iopCycleEE = -1;
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g_iopNextEventCycle = psxRegs.cycle + 4;
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psxHwReset();
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ioman::reset();
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}
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void psxShutdown() {
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//psxCpu->Shutdown();
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}
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void __fastcall psxException(u32 code, u32 bd)
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{
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// PSXCPU_LOG("psxException %x: %x, %x", code, psxHu32(0x1070), psxHu32(0x1074));
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//Console.WriteLn("!! psxException %x: %x, %x", code, psxHu32(0x1070), psxHu32(0x1074));
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// Set the Cause
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psxRegs.CP0.n.Cause &= ~0x7f;
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psxRegs.CP0.n.Cause |= code;
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// Set the EPC & PC
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if (bd)
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{
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PSXCPU_LOG("bd set");
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psxRegs.CP0.n.Cause|= 0x80000000;
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psxRegs.CP0.n.EPC = (psxRegs.pc - 4);
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}
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else
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psxRegs.CP0.n.EPC = (psxRegs.pc);
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if (psxRegs.CP0.n.Status & 0x400000)
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psxRegs.pc = 0xbfc00180;
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else
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psxRegs.pc = 0x80000080;
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// Set the Status
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psxRegs.CP0.n.Status = (psxRegs.CP0.n.Status &~0x3f) |
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((psxRegs.CP0.n.Status & 0xf) << 2);
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/*if ((((PSXMu32(psxRegs.CP0.n.EPC) >> 24) & 0xfe) == 0x4a)) {
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// "hokuto no ken" / "Crash Bandicot 2" ... fix
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PSXMu32(psxRegs.CP0.n.EPC)&= ~0x02000000;
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}*/
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/*if (psxRegs.CP0.n.Cause == 0x400 && (!(psxHu32(0x1450) & 0x8))) {
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hwIntcIrq(INTC_SBUS);
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}*/
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}
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__fi void psxSetNextBranch( u32 startCycle, s32 delta )
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{
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// typecast the conditional to signed so that things don't blow up
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// if startCycle is greater than our next branch cycle.
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if( (int)(g_iopNextEventCycle - startCycle) > delta )
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g_iopNextEventCycle = startCycle + delta;
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}
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__fi void psxSetNextBranchDelta( s32 delta )
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{
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psxSetNextBranch( psxRegs.cycle, delta );
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}
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__fi int psxTestCycle( u32 startCycle, s32 delta )
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{
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// typecast the conditional to signed so that things don't explode
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// if the startCycle is ahead of our current cpu cycle.
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return (int)(psxRegs.cycle - startCycle) >= delta;
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}
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__fi void PSX_INT( IopEventId n, s32 ecycle )
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{
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// 19 is CDVD read int, it's supposed to be high.
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//if (ecycle > 8192 && n != 19)
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// DevCon.Warning( "IOP cycles high: %d, n %d", ecycle, n );
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psxRegs.interrupt |= 1 << n;
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psxRegs.sCycle[n] = psxRegs.cycle;
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psxRegs.eCycle[n] = ecycle;
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psxSetNextBranchDelta( ecycle );
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if( iopCycleEE < 0 )
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{
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// The EE called this int, so inform it to branch as needed:
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// fixme - this doesn't take into account EE/IOP sync (the IOP may be running
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// ahead or behind the EE as per the EEsCycles value)
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s32 iopDelta = (g_iopNextEventCycle-psxRegs.cycle)*8;
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cpuSetNextEventDelta( iopDelta );
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}
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}
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static __fi void IopTestEvent( IopEventId n, void (*callback)() )
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{
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if( !(psxRegs.interrupt & (1 << n)) ) return;
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if( psxTestCycle( psxRegs.sCycle[n], psxRegs.eCycle[n] ) )
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{
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psxRegs.interrupt &= ~(1 << n);
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callback();
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}
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else
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psxSetNextBranch( psxRegs.sCycle[n], psxRegs.eCycle[n] );
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}
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static __fi void _psxTestInterrupts()
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{
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IopTestEvent(IopEvt_SIF0, sif0Interrupt); // SIF0
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IopTestEvent(IopEvt_SIF1, sif1Interrupt); // SIF1
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IopTestEvent(IopEvt_SIF2, sif2Interrupt); // SIF2
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#ifndef SIO_INLINE_IRQS
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IopTestEvent(IopEvt_SIO, sioInterrupt);
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#endif
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IopTestEvent(IopEvt_CdvdRead, cdvdReadInterrupt);
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// Profile-guided Optimization (sorta)
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// The following ints are rarely called. Encasing them in a conditional
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// as follows helps speed up most games.
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if( psxRegs.interrupt & ( (1ul<<5) | (3ul<<11) | (3ul<<20) | (3ul<<17) ) )
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{
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IopTestEvent(IopEvt_Cdvd, cdvdActionInterrupt);
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IopTestEvent(IopEvt_Dma11, psxDMA11Interrupt); // SIO2
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IopTestEvent(IopEvt_Dma12, psxDMA12Interrupt); // SIO2
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IopTestEvent(IopEvt_Cdrom, cdrInterrupt);
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IopTestEvent(IopEvt_CdromRead, cdrReadInterrupt);
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IopTestEvent(IopEvt_DEV9, dev9Interrupt);
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IopTestEvent(IopEvt_USB, usbInterrupt);
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}
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}
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__ri void iopEventTest()
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{
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if( psxTestCycle( psxNextsCounter, psxNextCounter ) )
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{
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psxRcntUpdate();
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iopEventAction = true;
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}
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else
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{
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// start the next branch at the next counter event by default
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// the interrupt code below will assign nearer branches if needed.
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g_iopNextEventCycle = psxNextsCounter+psxNextCounter;
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}
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if (psxRegs.interrupt)
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{
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iopEventTestIsActive = true;
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_psxTestInterrupts();
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iopEventTestIsActive = false;
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}
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if( (psxHu32(0x1078) != 0) && ((psxHu32(0x1070) & psxHu32(0x1074)) != 0) )
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{
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if( (psxRegs.CP0.n.Status & 0xFE01) >= 0x401 )
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{
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PSXCPU_LOG("Interrupt: %x %x", psxHu32(0x1070), psxHu32(0x1074));
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psxException(0, 0);
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iopEventAction = true;
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// No need to execute the SIFhack after cpuExceptions, since these by nature break SIF's
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// thread sleep hangs and allow the IOP to "come back to life."
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psxRegs.interrupt &= ~IopEvt_SIFhack;
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}
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}
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}
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void iopTestIntc()
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{
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if( psxHu32(0x1078) == 0 ) return;
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if( (psxHu32(0x1070) & psxHu32(0x1074)) == 0 ) return;
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if( !eeEventTestIsActive )
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{
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// An iop exception has occurred while the EE is running code.
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// Inform the EE to branch so the IOP can handle it promptly:
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cpuSetNextEventDelta( 16 );
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iopEventAction = true;
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//Console.Error( "** IOP Needs an EE EventText, kthx ** %d", iopCycleEE );
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// Note: No need to set the iop's branch delta here, since the EE
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// will run an IOP branch test regardless.
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}
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else if( !iopEventTestIsActive )
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psxSetNextBranchDelta( 2 );
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}
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