// Copyright (c) 2012- PPSSPP Project.

// 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, version 2.0 or later versions.

// 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 2.0 for more details.

// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/

// Official git repository and contact information can be found at
// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.

#include "Common.h"
#include "MIPS.h"
#include "MIPSTables.h"
#include "MIPSDebugInterface.h"
#include "MIPSVFPUUtils.h"
#include "../System.h"
#include "../HLE/sceDisplay.h"

#if defined(ARM)
#include "ARM/JitCache.h"
#include "ARM/Jit.h"
#else
#include "x86/JitCache.h"
#include "x86/Jit.h"
#endif
#include "JitCommon/JitCommon.h"
#include "../../Core/CoreTiming.h"

MIPSState mipsr4k;
MIPSState *currentMIPS = &mipsr4k;
MIPSDebugInterface debugr4k(&mipsr4k);
MIPSDebugInterface *currentDebugMIPS = &debugr4k;

MIPSState::MIPSState()
{
	cpuType = CPUTYPE_ALLEGREX;
	MIPSComp::jit = 0;
}

MIPSState::~MIPSState()
{
	delete MIPSComp::jit;
	MIPSComp::jit = 0;
}

void MIPSState::Reset()
{
	if (MIPSComp::jit)
		delete MIPSComp::jit;
	if (PSP_CoreParameter().cpuCore == CPU_JIT)
		MIPSComp::jit = new MIPSComp::Jit(this);

	memset(r, 0, sizeof(r));
	memset(f, 0, sizeof(f));
	memset(v, 0, sizeof(v));
	memset(vfpuCtrl, 0, sizeof(vfpuCtrl));

	vfpuCtrl[VFPU_CTRL_SPREFIX] = 0xe4; //passthru
	vfpuCtrl[VFPU_CTRL_TPREFIX] = 0xe4; //passthru
	vfpuCtrl[VFPU_CTRL_DPREFIX] = 0;
	vfpuCtrl[VFPU_CTRL_CC] = 0x3f;
	vfpuCtrl[VFPU_CTRL_INF4] = 0;
	vfpuCtrl[VFPU_CTRL_RCX0] = 0x3f800001;
	vfpuCtrl[VFPU_CTRL_RCX1] = 0x3f800002;
	vfpuCtrl[VFPU_CTRL_RCX2] = 0x3f800004;
	vfpuCtrl[VFPU_CTRL_RCX3] = 0x3f800008;
	vfpuCtrl[VFPU_CTRL_RCX4] = 0x3f800000;
	vfpuCtrl[VFPU_CTRL_RCX5] = 0x3f800000;
	vfpuCtrl[VFPU_CTRL_RCX6] = 0x3f800000;
	vfpuCtrl[VFPU_CTRL_RCX7] = 0x3f800000;

	bool b[4] = {false, false, false, false};
	SetWriteMask(b);

	pc = 0;
	hi = 0;
	lo = 0;
	fpcond = 0;
	fcr0 = 0;
	fcr31 = 0;
	debugCount = 0;
	exceptions = 0;
	currentMIPS = this;
	inDelaySlot = false;
	llBit = 0;
	nextPC = 0;
	// Initialize the VFPU random number generator with .. something?
	rng.Init(0x1337);
}

void MIPSState::SetWriteMask(const bool wm[4])
{
	for (int i = 0; i < 4; i++)
		vfpuWriteMask[i] = wm[i];
}

void MIPSState::SingleStep()
{
	int cycles = MIPS_SingleStep();
	CoreTiming::downcount -= cycles;
	CoreTiming::Advance();
}

// returns 1 if reached ticks limit
int MIPSState::RunLoopUntil(u64 globalTicks)
{
	switch (PSP_CoreParameter().cpuCore)
	{
	case CPU_JIT:
		MIPSComp::jit->RunLoopUntil(globalTicks);
		break;

	case CPU_FASTINTERPRETER:  // For jit-less platforms. Crashier than INTERPRETER.
		return MIPSInterpret_RunFastUntil(globalTicks);

	case CPU_INTERPRETER:
		// INFO_LOG(CPU, "Entering run loop for %i ticks, pc=%08x", (int)globalTicks, mipsr4k.pc);
		return MIPSInterpret_RunUntil(globalTicks);
	}
	return 1;
}

void MIPSState::WriteFCR(int reg, int value)
{
	if (reg == 31)
	{
		fcr31 = value;
		fpcond = (value >> 23) & 1;
	}
	else
	{
		// MessageBox(0, "Invalid FCR","...",0);
	}
	DEBUG_LOG(CPU, "FCR%i written to, value %08x", reg, value);
}

u32 MIPSState::ReadFCR(int reg)
{
	DEBUG_LOG(CPU,"FCR%i read",reg);
	if (reg == 31)
	{
		fcr31 = (fcr31 & ~(1<<23)) | ((fpcond & 1)<<23);
		return fcr31;
	}
	else if (reg == 0)
	{
		return fcr0;
	}
	else
	{
		// MessageBox(0, "Invalid FCR","...",0);
	}
	return 0;
}


// Interrupts should be served directly on the running thread.
void MIPSState::Irq()
{
//	if (IRQEnabled())
	{
	}
}


void MIPSState::SWI()
{
}