// Copyright (C) 2003-2009 Dolphin 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.

// 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 SVN repository and contact information can be found at
// http://code.google.com/p/dolphin-emu/

#ifndef _POWERPC_H
#define _POWERPC_H

#include "Common.h"
#include "Gekko.h"
#include "BreakPoints.h"
#include "../Debugger/PPCDebugInterface.h"

class PointerWrap;

namespace PowerPC
{

enum CoreMode
{
	MODE_INTERPRETER,
	MODE_JIT,
};

// This contains the entire state of the emulated PowerPC "Gekko" CPU.
struct GC_ALIGNED64(PowerPCState)
{
	u32 mojs[128];  // Try to isolate the regs from other variables in the cache.
	u32 gpr[32];    // General purpose registers. r1 = stack pointer.

	// The paired singles are strange : PS0 is stored in the full 64 bits of each FPR
	// but ps calculations are only done in 32-bit precision, and PS1 is only 32 bits.
	// Since we want to use SIMD, SSE2 is the only viable alternative - 2x double.
	u64 ps[32][2];

	u32 pc;     // program counter
	u32 npc;

	u32 cr;            // flags
	u8 cr_fast[8];     // Possibly reorder to 0, 2, 4, 8, 1, 3, 5, 7 so that we can make Compact and Expand super fast?

	u32 msr;    // machine specific register
	u32 fpscr;  // floating point flags/status bits

	// Exception management.
	u32 Exceptions;

	u32 sr[16];  // Segment registers. Unused.

	u32 DebugCount;
	
	// special purpose registers - controlls quantizers, DMA, and lots of other misc extensions.
	// also for power management, but we don't care about that.
	u32 spr[1024];
};

enum CPUState
{
	CPU_RUNNING = 0,
	CPU_STEPPING = 2,
	CPU_POWERDOWN = 3,
};

extern PowerPCState ppcState;

extern BreakPoints breakpoints;
extern MemChecks memchecks;
extern PPCDebugInterface debug_interface;

void Init();
void Shutdown();
void DoState(PointerWrap &p);

void SetMode(CoreMode _coreType);

void SingleStep();	
void CheckExceptions();
void RunLoop();
void Start();
void Pause();
void Stop();
CPUState GetState();
volatile CPUState *GetStatePtr();  // this oddity is here instead of an extern declaration to easily be able to find all direct accesses throughout the code.

void CompactCR();
void ExpandCR();

void OnIdle(u32 _uThreadAddr);
void OnIdleIL();

	// Easy register access macros.
#define HID2 ((UReg_HID2&)PowerPC::ppcState.spr[SPR_HID2])
#define DMAU  (*(UReg_DMAU*)&PowerPC::ppcState.spr[SPR_DMAU])
#define DMAL  (*(UReg_DMAL*)&PowerPC::ppcState.spr[SPR_DMAL])
#define PC     PowerPC::ppcState.pc
#define NPC    PowerPC::ppcState.npc
#define FPSCR  ((UReg_FPSCR&)PowerPC::ppcState.fpscr)
#define MSR    PowerPC::ppcState.msr
#define GPR(n) PowerPC::ppcState.gpr[n]

#define rGPR PowerPC::ppcState.gpr
#define rSPR(i) PowerPC::ppcState.spr[i]
#define LR     PowerPC::ppcState.spr[SPR_LR]
#define CTR    PowerPC::ppcState.spr[SPR_CTR]
#define rDEC    PowerPC::ppcState.spr[SPR_DEC]
#define SRR0   PowerPC::ppcState.spr[SPR_SRR0]
#define SRR1   PowerPC::ppcState.spr[SPR_SRR1]
#define SPRG0  PowerPC::ppcState.spr[SPR_SPRG0]	
#define SPRG1  PowerPC::ppcState.spr[SPR_SPRG1]
#define SPRG2  PowerPC::ppcState.spr[SPR_SPRG2]
#define SPRG3  PowerPC::ppcState.spr[SPR_SPRG3]
#define GQR(x) PowerPC::ppcState.spr[SPR_GQR0+x]
#define TL	   PowerPC::ppcState.spr[SPR_TL]
#define TU	   PowerPC::ppcState.spr[SPR_TU]

#define rPS0(i)	(*(double*)(&PowerPC::ppcState.ps[i][0]))
#define rPS1(i) (*(double*)(&PowerPC::ppcState.ps[i][1]))

#define riPS0(i) (*(u64*)(&PowerPC::ppcState.ps[i][0]))
#define riPS1(i) (*(u64*)(&PowerPC::ppcState.ps[i][1]))

}  // namespace

// Fast CR system - store them in single bytes instead of nibbles to not have to
// mask/shift them out.

// These are intended to stay fast, probably become faster, and are not likely to slow down much if at all.
inline void SetCRField(int cr_field, int value) {
	PowerPC::ppcState.cr_fast[cr_field] = value;
}

inline u32 GetCRField(int cr_field) {
	return PowerPC::ppcState.cr_fast[cr_field];
}

inline u32 GetCRBit(int bit) {
	return (PowerPC::ppcState.cr_fast[bit >> 2] >> (3 - (bit & 3))) & 1;
}

inline void SetCRBit(int bit, int value) {
	if (value & 1)
		PowerPC::ppcState.cr_fast[bit >> 2] |= 0x8 >> (bit & 3);
	else
		PowerPC::ppcState.cr_fast[bit >> 2] &= ~(0x8 >> (bit & 3));
}

// SetCR and GetCR are fairly slow. Should be avoided if possible.
inline void SetCR(u32 new_cr) {
	PowerPC::ppcState.cr = new_cr;
	PowerPC::ExpandCR();
}

inline u32 GetCR() {
	PowerPC::CompactCR();
	return PowerPC::ppcState.cr;
}

// SetCarry/GetCarry may speed up soon.
inline void SetCarry(int ca) {
	((UReg_XER&)PowerPC::ppcState.spr[SPR_XER]).CA = ca;
}

inline int GetCarry() {
	return ((UReg_XER&)PowerPC::ppcState.spr[SPR_XER]).CA;
}

inline UReg_XER GetXER() {
	return ((UReg_XER&)PowerPC::ppcState.spr[SPR_XER]);
}

inline void SetXER(UReg_XER new_xer) {
	((UReg_XER&)PowerPC::ppcState.spr[SPR_XER]) = new_xer;
}

inline int GetXER_SO() {
	return ((UReg_XER&)PowerPC::ppcState.spr[SPR_XER]).SO;
}

inline void SetXER_SO(int value) {
	((UReg_XER&)PowerPC::ppcState.spr[SPR_XER]).SO = value;
}

void UpdateFPRF(double dvalue);

#endif
