// Copyright (C) 2003 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 Git repository and contact information can be found at
// https://github.com/dolphin-emu/dolphin

#include "Common/Atomic.h"
#include "Common/BitSet.h"
#include "Common/CommonTypes.h"

#include "Core/ConfigManager.h"
#include "Core/Core.h"
#include "Core/HW/GPFifo.h"
#include "Core/HW/Memmap.h"
#include "Core/HW/MMIO.h"
#include "Core/PowerPC/PowerPC.h"

#include "VideoCommon/VideoBackendBase.h"

#ifdef USE_GDBSTUB
#include "Core/PowerPC/GDBStub.h"
#endif

namespace PowerPC
{

#define HW_PAGE_SIZE 4096

// EFB RE
/*
GXPeekZ
80322de8: rlwinm    r0, r3, 2, 14, 29 (0003fffc)   a =  x << 2 & 0x3fffc
80322dec: oris      r0, r0, 0xC800                 a |= 0xc8000000
80322df0: rlwinm    r3, r0, 0, 20, 9 (ffc00fff)    x = a & 0xffc00fff
80322df4: rlwinm    r0, r4, 12, 4, 19 (0ffff000)   a = (y << 12) & 0x0ffff000;
80322df8: or        r0, r3, r0                     a |= x;
80322dfc: rlwinm    r0, r0, 0, 10, 7 (ff3fffff)    a &= 0xff3fffff
80322e00: oris      r3, r0, 0x0040                 x = a | 0x00400000
80322e04: lwz       r0, 0 (r3)                     r0 = *r3
80322e08: stw       r0, 0 (r5)                     z =
80322e0c: blr
*/


// =================================
// From Memmap.cpp
// ----------------

// Overloaded byteswap functions, for use within the templated functions below.
inline u8 bswap(u8 val)   { return val; }
inline s8 bswap(s8 val)   { return val; }
inline u16 bswap(u16 val) { return Common::swap16(val); }
inline s16 bswap(s16 val) { return Common::swap16(val); }
inline u32 bswap(u32 val) { return Common::swap32(val); }
inline u64 bswap(u64 val) { return Common::swap64(val); }
// =================

enum XCheckTLBFlag
{
	FLAG_NO_EXCEPTION,
	FLAG_READ,
	FLAG_WRITE,
	FLAG_OPCODE,
};
template <const XCheckTLBFlag flag> static u32 TranslateAddress(const u32 address);

// Nasty but necessary. Super Mario Galaxy pointer relies on this stuff.
static u32 EFB_Read(const u32 addr)
{
	u32 var = 0;
	// Convert address to coordinates. It's possible that this should be done
	// differently depending on color depth, especially regarding PEEK_COLOR.
	int x = (addr & 0xfff) >> 2;
	int y = (addr >> 12) & 0x3ff;

	if (addr & 0x00400000)
	{
		var = g_video_backend->Video_AccessEFB(PEEK_Z, x, y, 0);
		DEBUG_LOG(MEMMAP, "EFB Z Read @ %i, %i\t= 0x%08x", x, y, var);
	}
	else
	{
		var = g_video_backend->Video_AccessEFB(PEEK_COLOR, x, y, 0);
		DEBUG_LOG(MEMMAP, "EFB Color Read @ %i, %i\t= 0x%08x", x, y, var);
	}

	return var;
}

static void EFB_Write(u32 data, u32 addr)
{
	int x = (addr & 0xfff) >> 2;
	int y = (addr >> 12) & 0x3ff;

	if (addr & 0x00400000)
	{
		g_video_backend->Video_AccessEFB(POKE_Z, x, y, data);
		DEBUG_LOG(MEMMAP, "EFB Z Write %08x @ %i, %i", data, x, y);
	}
	else
	{
		g_video_backend->Video_AccessEFB(POKE_COLOR, x, y, data);
		DEBUG_LOG(MEMMAP, "EFB Color Write %08x @ %i, %i", data, x, y);
	}
}


static void GenerateDSIException(u32 _EffectiveAddress, bool _bWrite);

template <XCheckTLBFlag flag, typename T>
__forceinline static T ReadFromHardware(const u32 em_address)
{
	int segment = em_address >> 28;
	bool performTranslation = UReg_MSR(MSR).DR;

	// Quick check for an address that can't meet any of the following conditions,
	// to speed up the MMU path.
	if (!BitSet32(0xCFC)[segment] && performTranslation)
	{
		// TODO: Figure out the fastest order of tests for both read and write (they are probably different).
		if (flag == FLAG_READ && (em_address & 0xF8000000) == 0xC8000000)
		{
			if (em_address < 0xcc000000)
				return EFB_Read(em_address);
			else
				return (T)Memory::mmio_mapping->Read<typename std::make_unsigned<T>::type>(em_address & 0x0FFFFFFF);
		}
		if (segment == 0x0 || segment == 0x8 || segment == 0xC)
		{
			// Handle RAM; the masking intentionally discards bits (essentially creating
			// mirrors of memory).
			// TODO: Only the first REALRAM_SIZE is supposed to be backed by actual memory.
			return bswap((*(const T*)&Memory::m_pRAM[em_address & Memory::RAM_MASK]));
		}
		if (Memory::m_pEXRAM && (segment == 0x9 || segment == 0xD) && (em_address & 0x0FFFFFFF) < Memory::EXRAM_SIZE)
		{
			// Handle EXRAM.
			// TODO: Is this supposed to be mirrored like main RAM?
			return bswap((*(const T*)&Memory::m_pEXRAM[em_address & 0x0FFFFFFF]));
		}
		if (segment == 0xE && (em_address < (0xE0000000 + Memory::L1_CACHE_SIZE)))
		{
			return bswap((*(const T*)&Memory::m_pL1Cache[em_address & 0x0FFFFFFF]));
		}
	}

	if (Memory::bFakeVMEM && performTranslation && (segment == 0x7 || segment == 0x4))
	{
		// fake VMEM
		return bswap((*(const T*)&Memory::m_pFakeVMEM[em_address & Memory::FAKEVMEM_MASK]));
	}

	if (!performTranslation)
	{
		if (flag == FLAG_READ && (em_address & 0xF8000000) == 0x08000000)
		{
			if (em_address < 0x0c000000)
				return EFB_Read(em_address);
			else
				return (T)Memory::mmio_mapping->Read<typename std::make_unsigned<T>::type>(em_address);
		}
		if (segment == 0x0)
		{
			// Handle RAM; the masking intentionally discards bits (essentially creating
			// mirrors of memory).
			// TODO: Only the first REALRAM_SIZE is supposed to be backed by actual memory.
			return bswap((*(const T*)&Memory::m_pRAM[em_address & Memory::RAM_MASK]));
		}
		if (Memory::m_pEXRAM && segment == 0x1 && (em_address & 0x0FFFFFFF) < Memory::EXRAM_SIZE)
		{
			return bswap((*(const T*)&Memory::m_pEXRAM[em_address & 0x0FFFFFFF]));
		}
		PanicAlert("Unable to resolve read address %x PC %x", em_address, PC);
		return 0;
	}

	// MMU: Do page table translation
	u32 tlb_addr = TranslateAddress<flag>(em_address);
	if (tlb_addr == 0)
	{
		if (flag == FLAG_READ)
			GenerateDSIException(em_address, false);
		return 0;
	}

	// Handle loads that cross page boundaries (ewwww)
	// The alignment check isn't strictly necessary, but since this is a rare slow path, it provides a faster
	// (1 instruction on x86) bailout.
	if (sizeof(T) > 1 && (em_address & (sizeof(T) - 1)) && (em_address & (HW_PAGE_SIZE - 1)) > HW_PAGE_SIZE - sizeof(T))
	{
		// This could be unaligned down to the byte level... hopefully this is rare, so doing it this
		// way isn't too terrible.
		// TODO: floats on non-word-aligned boundaries should technically cause alignment exceptions.
		// Note that "word" means 32-bit, so paired singles or doubles might still be 32-bit aligned!
		u32 em_address_next_page = (em_address + sizeof(T) - 1) & ~(HW_PAGE_SIZE - 1);
		u32 tlb_addr_next_page = TranslateAddress<flag>(em_address_next_page);
		if (tlb_addr == 0 || tlb_addr_next_page == 0)
		{
			if (flag == FLAG_READ)
				GenerateDSIException(em_address_next_page, false);
			return 0;
		}
		T var = 0;
		for (u32 addr = em_address; addr < em_address + sizeof(T); addr++, tlb_addr++)
		{
			if (addr == em_address_next_page)
				tlb_addr = tlb_addr_next_page;
			var = (var << 8) | Memory::physical_base[tlb_addr];
		}
		return var;
	}

	// The easy case!
	return bswap(*(const T*)&Memory::physical_base[tlb_addr]);
}


template <XCheckTLBFlag flag, typename T>
__forceinline static void WriteToHardware(u32 em_address, const T data)
{
	int segment = em_address >> 28;
	// Quick check for an address that can't meet any of the following conditions,
	// to speed up the MMU path.
	bool performTranslation = UReg_MSR(MSR).DR;

	if (!BitSet32(0xCFC)[segment] && performTranslation)
	{
		// First, let's check for FIFO writes, since they are probably the most common
		// reason we end up in this function:
		if (flag == FLAG_WRITE && (em_address & 0xFFFFF000) == 0xCC008000)
		{
			switch (sizeof(T))
			{
			case 1: GPFifo::Write8((u8)data, em_address); return;
			case 2: GPFifo::Write16((u16)data, em_address); return;
			case 4: GPFifo::Write32((u32)data, em_address); return;
			case 8: GPFifo::Write64((u64)data, em_address); return;
			}
		}
		if (flag == FLAG_WRITE && (em_address & 0xF8000000) == 0xC8000000)
		{
			if (em_address < 0xcc000000)
			{
				// TODO: This only works correctly for 32-bit writes.
				EFB_Write((u32)data, em_address);
				return;
			}
			else
			{
				Memory::mmio_mapping->Write(em_address & 0x0FFFFFFF, data);
				return;
			}
		}
		if (segment == 0x0 || segment == 0x8 || segment == 0xC)
		{
			// Handle RAM; the masking intentionally discards bits (essentially creating
			// mirrors of memory).
			// TODO: Only the first REALRAM_SIZE is supposed to be backed by actual memory.
			*(T*)&Memory::m_pRAM[em_address & Memory::RAM_MASK] = bswap(data);
			return;
		}
		if (Memory::m_pEXRAM && (segment == 0x9 || segment == 0xD) && (em_address & 0x0FFFFFFF) < Memory::EXRAM_SIZE)
		{
			// Handle EXRAM.
			// TODO: Is this supposed to be mirrored like main RAM?
			*(T*)&Memory::m_pEXRAM[em_address & 0x0FFFFFFF] = bswap(data);
			return;
		}
		if (segment == 0xE && (em_address < (0xE0000000 + Memory::L1_CACHE_SIZE)))
		{
			*(T*)&Memory::m_pL1Cache[em_address & 0x0FFFFFFF] = bswap(data);
			return;
		}
	}

	if (Memory::bFakeVMEM && performTranslation && (segment == 0x7 || segment == 0x4))
	{
		// fake VMEM
		*(T*)&Memory::m_pFakeVMEM[em_address & Memory::FAKEVMEM_MASK] = bswap(data);
		return;
	}

	if (!performTranslation)
	{
		if (flag == FLAG_WRITE && (em_address & 0xFFFFF000) == 0x0C008000)
		{
			switch (sizeof(T))
			{
			case 1: GPFifo::Write8((u8)data, em_address); return;
			case 2: GPFifo::Write16((u16)data, em_address); return;
			case 4: GPFifo::Write32((u32)data, em_address); return;
			case 8: GPFifo::Write64((u64)data, em_address); return;
			}
		}
		if (flag == FLAG_WRITE && (em_address & 0xF8000000) == 0x08000000)
		{
			if (em_address < 0x0c000000)
			{
				// TODO: This only works correctly for 32-bit writes.
				EFB_Write((u32)data, em_address);
				return;
			}
			else
			{
				Memory::mmio_mapping->Write(em_address, data);
				return;
			}
		}
		if (segment == 0x0)
		{
			// Handle RAM; the masking intentionally discards bits (essentially creating
			// mirrors of memory).
			// TODO: Only the first REALRAM_SIZE is supposed to be backed by actual memory.
			*(T*)&Memory::m_pRAM[em_address & Memory::RAM_MASK] = bswap(data);
			return;
		}
		if (Memory::m_pEXRAM && segment == 0x1 && (em_address & 0x0FFFFFFF) < Memory::EXRAM_SIZE)
		{
			*(T*)&Memory::m_pEXRAM[em_address & 0x0FFFFFFF] = bswap(data);
			return;
		}
		PanicAlert("Unable to resolve write address %x PC %x", em_address, PC);
		return;
	}

	// MMU: Do page table translation
	u32 tlb_addr = TranslateAddress<flag>(em_address);
	if (tlb_addr == 0)
	{
		if (flag == FLAG_WRITE)
			GenerateDSIException(em_address, true);
		return;
	}

	// Handle stores that cross page boundaries (ewwww)
	if (sizeof(T) > 1 && (em_address & (sizeof(T) - 1)) && (em_address & (HW_PAGE_SIZE - 1)) > HW_PAGE_SIZE - sizeof(T))
	{
		T val = bswap(data);

		// We need to check both addresses before writing in case there's a DSI.
		u32 em_address_next_page = (em_address + sizeof(T) - 1) & ~(HW_PAGE_SIZE - 1);
		u32 tlb_addr_next_page = TranslateAddress<flag>(em_address_next_page);
		if (tlb_addr_next_page == 0)
		{
			if (flag == FLAG_WRITE)
				GenerateDSIException(em_address_next_page, true);
			return;
		}
		for (u32 addr = em_address; addr < em_address + sizeof(T); addr++, tlb_addr++, val >>= 8)
		{
			if (addr == em_address_next_page)
				tlb_addr = tlb_addr_next_page;
			Memory::physical_base[tlb_addr] = (u8)val;
		}
		return;
	}

	// The easy case!
	*(T*)&Memory::physical_base[tlb_addr] = bswap(data);
}
// =====================


// =================================
/* These functions are primarily called by the Interpreter functions and are routed to the correct
   location through ReadFromHardware and WriteToHardware */
// ----------------

static void GenerateISIException(u32 effective_address);

u32 Read_Opcode(u32 address)
{
	TryReadInstResult result = TryReadInstruction(address);
	if (!result.valid)
	{
		GenerateISIException(address);
		return 0;
	}
	return result.hex;
}

TryReadInstResult TryReadInstruction(u32 address)
{
	bool from_bat = true;
	if (UReg_MSR(MSR).IR)
	{
		// TODO: Use real translation.
		if (SConfig::GetInstance().m_LocalCoreStartupParameter.bMMU && (address & Memory::ADDR_MASK_MEM1))
		{
			u32 tlb_addr = TranslateAddress<FLAG_OPCODE>(address);
			if (tlb_addr == 0)
			{
				return TryReadInstResult{ false, false, 0 };
			}
			else
			{
				address = tlb_addr;
				from_bat = false;
			}
		}
		else
		{
			int segment = address >> 28;
			if ((segment == 0x8 || segment == 0x0) && (address & 0x0FFFFFFF) < Memory::REALRAM_SIZE)
			{
				address = address & 0x3FFFFFFF;
			}
			else if (segment == 0x9 && (address & 0x0FFFFFFF) < Memory::EXRAM_SIZE)
			{
				address = address & 0x3FFFFFFF;
			}
			else if (Memory::bFakeVMEM && (segment == 0x7 || segment == 0x4))
			{
				u32 hex = bswap((*(const u32*)&Memory::m_pFakeVMEM[address & Memory::FAKEVMEM_MASK]));
				return TryReadInstResult{ true, true, hex };
			}
			else
			{
				return TryReadInstResult{ false, false, 0 };
			}
		}
	}
	else
	{
		if (address & 0xC0000000)
			ERROR_LOG(MEMMAP, "Strange program counter with address translation off: 0x%08x", address);
	}

	u32 hex = PowerPC::ppcState.iCache.ReadInstruction(address);
	return TryReadInstResult{ true, from_bat, hex };
}

u32 HostRead_Instruction(const u32 address)
{
	UGeckoInstruction inst = HostRead_U32(address);
	return inst.hex;
}

static __forceinline void Memcheck(u32 address, u32 var, bool write, int size)
{
#ifdef ENABLE_MEM_CHECK
	TMemCheck *mc = PowerPC::memchecks.GetMemCheck(address);
	if (mc)
	{
		mc->numHits++;
		mc->Action(&PowerPC::debug_interface, var, address, write, size, PC);
	}
#endif
}

u8 Read_U8(const u32 address)
{
	u8 var = ReadFromHardware<FLAG_READ, u8>(address);
	Memcheck(address, var, false, 1);
	return (u8)var;
}

u16 Read_U16(const u32 address)
{
	u16 var = ReadFromHardware<FLAG_READ, u16>(address);
	Memcheck(address, var, false, 2);
	return (u16)var;
}

u32 Read_U32(const u32 address)
{
	u32 var = ReadFromHardware<FLAG_READ, u32>(address);
	Memcheck(address, var, false, 4);
	return var;
}

u64 Read_U64(const u32 address)
{
	u64 var = ReadFromHardware<FLAG_READ, u64>(address);
	Memcheck(address, (u32)var, false, 8);
	return var;
}

double Read_F64(const u32 address)
{
	union
	{
		u64 i;
		double d;
	} cvt;

	cvt.i = Read_U64(address);
	return cvt.d;
}

float Read_F32(const u32 address)
{
	union
	{
		u32 i;
		float d;
	} cvt;

	cvt.i = Read_U32(address);
	return cvt.d;
}

u32 Read_U8_ZX(const u32 address)
{
	return (u32)Read_U8(address);
}

u32 Read_U16_ZX(const u32 address)
{
	return (u32)Read_U16(address);
}

void Write_U8(const u8 var, const u32 address)
{
	Memcheck(address, var, true, 1);
	WriteToHardware<FLAG_WRITE, u8>(address, var);
}

void Write_U16(const u16 var, const u32 address)
{
	Memcheck(address, var, true, 2);
	WriteToHardware<FLAG_WRITE, u16>(address, var);
}
void Write_U16_Swap(const u16 var, const u32 address)
{
	Memcheck(address, var, true, 2);
	Write_U16(Common::swap16(var), address);
}


void Write_U32(const u32 var, const u32 address)
{
	Memcheck(address, var, true, 4);
	WriteToHardware<FLAG_WRITE, u32>(address, var);
}
void Write_U32_Swap(const u32 var, const u32 address)
{
	Memcheck(address, var, true, 4);
	Write_U32(Common::swap32(var), address);
}

void Write_U64(const u64 var, const u32 address)
{
	Memcheck(address, (u32)var, true, 8);
	WriteToHardware<FLAG_WRITE, u64>(address, var);
}
void Write_U64_Swap(const u64 var, const u32 address)
{
	Memcheck(address, (u32)var, true, 8);
	Write_U64(Common::swap64(var), address);
}

void Write_F64(const double var, const u32 address)
{
	union
	{
		u64 i;
		double d;
	} cvt;
	cvt.d = var;
	Write_U64(cvt.i, address);
}

u8 HostRead_U8(const u32 address)
{
	u8 var = ReadFromHardware<FLAG_NO_EXCEPTION, u8>(address);
	return var;
}

u16 HostRead_U16(const u32 address)
{
	u16 var = ReadFromHardware<FLAG_NO_EXCEPTION, u16>(address);
	return var;
}

u32 HostRead_U32(const u32 address)
{
	u32 var = ReadFromHardware<FLAG_NO_EXCEPTION, u32>(address);
	return var;
}

void HostWrite_U8(const u8 var, const u32 address)
{
	WriteToHardware<FLAG_NO_EXCEPTION, u8>(address, var);
}

void HostWrite_U16(const u16 var, const u32 address)
{
	WriteToHardware<FLAG_NO_EXCEPTION, u16>(address, var);
}

void HostWrite_U32(const u32 var, const u32 address)
{
	WriteToHardware<FLAG_NO_EXCEPTION, u32>(address, var);
}

void HostWrite_U64(const u64 var, const u32 address)
{
	WriteToHardware<FLAG_NO_EXCEPTION, u64>(address, var);
}

std::string HostGetString(u32 address, size_t size)
{
	std::string s;
	do
	{
		if (!HostIsRAMAddress(address))
			break;
		u8 res = HostRead_U8(address);
		if (!res)
			break;
		++address;
	} while (size == 0 || s.length() < size);
	return s;
}

bool IsOptimizableRAMAddress(const u32 address)
{
	if (!UReg_MSR(MSR).DR)
		return false;

	int segment = address >> 28;

	return (((segment == 0x8 || segment == 0xC || segment == 0x0) && (address & 0x0FFFFFFF) < Memory::REALRAM_SIZE) ||
		(Memory::m_pEXRAM && (segment == 0x9 || segment == 0xD) && (address & 0x0FFFFFFF) < Memory::EXRAM_SIZE) ||
		(segment == 0xE && (address < (0xE0000000 + Memory::L1_CACHE_SIZE))));
}

bool HostIsRAMAddress(u32 address)
{
	// TODO: This needs to be rewritten; it makes incorrect assumptions
	// about BATs and page tables.
	bool performTranslation = UReg_MSR(MSR).DR;
	int segment = address >> 28;
	if (performTranslation)
	{
		if ((segment == 0x8 || segment == 0xC || segment == 0x0) && (address & 0x0FFFFFFF) < Memory::REALRAM_SIZE)
			return true;
		else if (Memory::m_pEXRAM && (segment == 0x9 || segment == 0xD) && (address & 0x0FFFFFFF) < Memory::EXRAM_SIZE)
			return true;
		else if (Memory::bFakeVMEM && (segment == 0x7 || segment == 0x4))
			return true;
		else if (segment == 0xE && (address < (0xE0000000 + Memory::L1_CACHE_SIZE)))
			return true;

		address = TranslateAddress<FLAG_NO_EXCEPTION>(address);
		if (!address)
			return false;
	}

	if (segment == 0x0 && (address & 0x0FFFFFFF) < Memory::REALRAM_SIZE)
		return true;
	else if (Memory::m_pEXRAM && segment == 0x1 && (address & 0x0FFFFFFF) < Memory::EXRAM_SIZE)
		return true;
	return false;


}

void DMA_LCToMemory(const u32 memAddr, const u32 cacheAddr, const u32 numBlocks)
{
	// TODO: It's not completely clear this is the right spot for this code;
	// what would happen if, for example, the DVD drive tried to write to the EFB?
	// TODO: This is terribly slow.
	// TODO: Refactor.
	// Avatar: The Last Airbender (GC) uses this for videos.
	if ((memAddr & 0x0F000000) == 0x08000000)
	{
		for (u32 i = 0; i < 32 * numBlocks; i += 4)
		{
			u32 data = bswap(*(u32*)(Memory::m_pL1Cache + ((cacheAddr + i) & 0x3FFFF)));
			EFB_Write(data, memAddr + i);
		}
		return;
	}

	// No known game uses this; here for completeness.
	// TODO: Refactor.
	if ((memAddr & 0x0F000000) == 0x0C000000)
	{
		for (u32 i = 0; i < 32 * numBlocks; i += 4)
		{
			u32 data = bswap(*(u32*)(Memory::m_pL1Cache + ((cacheAddr + i) & 0x3FFFF)));
			Memory::mmio_mapping->Write(memAddr + i, data);
		}
		return;
	}

	const u8* src = Memory::m_pL1Cache + (cacheAddr & 0x3FFFF);
	u8* dst = Memory::GetPointer(memAddr);
	if (dst == nullptr)
		return;

	memcpy(dst, src, 32 * numBlocks);
}

void DMA_MemoryToLC(const u32 cacheAddr, const u32 memAddr, const u32 numBlocks)
{
	const u8* src = Memory::GetPointer(memAddr);
	u8* dst = Memory::m_pL1Cache + (cacheAddr & 0x3FFFF);

	// No known game uses this; here for completeness.
	// TODO: Refactor.
	if ((memAddr & 0x0F000000) == 0x08000000)
	{
		for (u32 i = 0; i < 32 * numBlocks; i += 4)
		{
			u32 data = EFB_Read(memAddr + i);
			*(u32*)(Memory::m_pL1Cache + ((cacheAddr + i) & 0x3FFFF)) = bswap(data);
		}
		return;
	}

	// No known game uses this.
	// TODO: Refactor.
	if ((memAddr & 0x0F000000) == 0x0C000000)
	{
		for (u32 i = 0; i < 32 * numBlocks; i += 4)
		{
			u32 data = Memory::mmio_mapping->Read<u32>(memAddr + i);
			*(u32*)(Memory::m_pL1Cache + ((cacheAddr + i) & 0x3FFFF)) = bswap(data);
		}
		return;
	}

	if (src == nullptr)
		return;

	memcpy(dst, src, 32 * numBlocks);
}

void ClearCacheLine(const u32 address)
{
	// FIXME: does this do the right thing if dcbz is run on hardware memory, e.g.
	// the FIFO? Do games even do that? Probably not, but we should try to be correct...
	for (u32 i = 0; i < 32; i += 8)
		Write_U64(0, address + i);
}

u32 IsOptimizableMMIOAccess(u32 address, u32 accessSize)
{
	if (!UReg_MSR(MSR).DR)
		return 0;

	if ((address & 0xF0000000) != 0xC0000000)
		return 0;

	unsigned translated = address & 0x0FFFFFFF;
	bool aligned = (translated & ((accessSize >> 3) - 1)) == 0;
	if (!aligned || !MMIO::IsMMIOAddress(translated))
		return 0;
	return translated;
}

bool IsOptimizableGatherPipeWrite(u32 address)
{
	if (!UReg_MSR(MSR).DR)
		return false;

	return address == 0xCC008000;
}

// *********************************************************************************
// Warning: Test Area
//
// This code is for TESTING and it works in interpreter mode ONLY. Some games (like
// COD iirc) work thanks to this basic TLB emulation.
// It is just a small hack and we have never spend enough time to finalize it.
// Cheers PearPC!
//
// *********************************************************************************

/*
* PearPC
* ppc_mmu.cc
*
* Copyright (C) 2003, 2004 Sebastian Biallas (sb@biallas.net)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/


#define PPC_EXC_DSISR_PAGE (1<<30)
#define PPC_EXC_DSISR_PROT (1<<27)
#define PPC_EXC_DSISR_STORE (1<<25)

#define SDR1_HTABORG(v) (((v)>>16)&0xffff)
#define SDR1_HTABMASK(v) ((v)&0x1ff)
#define SDR1_PAGETABLE_BASE(v) ((v)&0xffff)
#define SR_T  (1<<31)
#define SR_Ks (1<<30)
#define SR_Kp (1<<29)
#define SR_N  (1<<28)
#define SR_VSID(v)       ((v)&0xffffff)
#define SR_BUID(v)       (((v)>>20)&0x1ff)
#define SR_CNTRL_SPEC(v) ((v)&0xfffff)

#define EA_SR(v)         (((v)>>28)&0xf)
#define EA_PageIndex(v)  (((v)>>12)&0xffff)
#define EA_Offset(v)     ((v)&0xfff)
#define EA_API(v)        (((v)>>22)&0x3f)

#define PA_RPN(v)        (((v)>>12)&0xfffff)
#define PA_Offset(v)     ((v)&0xfff)

#define PTE1_V       (1<<31)
#define PTE1_VSID(v) (((v)>>7)&0xffffff)
#define PTE1_H       (1<<6)
#define PTE1_API(v)  ((v)&0x3f)

#define PTE2_RPN(v)  ((v)&0xfffff000)
#define PTE2_R       (1<<8)
#define PTE2_C       (1<<7)
#define PTE2_WIMG(v) (((v)>>3)&0xf)
#define PTE2_PP(v)   ((v)&3)

// Hey! these duplicate a structure in Gekko.h
union UPTE1
{
	struct
	{
		u32 API    : 6;
		u32 H      : 1;
		u32 VSID   : 24;
		u32 V      : 1;
	};
	u32 Hex;
};

union UPTE2
{
	struct
	{
		u32 PP     : 2;
		u32        : 1;
		u32 WIMG   : 4;
		u32 C      : 1;
		u32 R      : 1;
		u32        : 3;
		u32 RPN    : 20;
	};
	u32 Hex;
};

static void GenerateDSIException(u32 effectiveAddress, bool write)
{
	// DSI exceptions are only supported in MMU mode.
	if (!SConfig::GetInstance().m_LocalCoreStartupParameter.bMMU)
	{
		PanicAlertT("Invalid %s to 0x%08x, PC = 0x%08x ", write ? "Write to" : "Read from", effectiveAddress, PC);
		return;
	}

	if (effectiveAddress)
		PowerPC::ppcState.spr[SPR_DSISR] = PPC_EXC_DSISR_PAGE | PPC_EXC_DSISR_STORE;
	else
		PowerPC::ppcState.spr[SPR_DSISR] = PPC_EXC_DSISR_PAGE;

	PowerPC::ppcState.spr[SPR_DAR] = effectiveAddress;

	PowerPC::ppcState.Exceptions |= EXCEPTION_DSI;
}


static void GenerateISIException(u32 _EffectiveAddress)
{
	// Address of instruction could not be translated
	NPC = _EffectiveAddress;

	PowerPC::ppcState.Exceptions |= EXCEPTION_ISI;
}


void SDRUpdated()
{
	u32 htabmask = SDR1_HTABMASK(PowerPC::ppcState.spr[SPR_SDR]);
	u32 x = 1;
	u32 xx = 0;
	int n = 0;
	while ((htabmask & x) && (n < 9))
	{
		n++;
		xx|=x;
		x<<=1;
	}
	if (htabmask & ~xx)
	{
		return;
	}
	u32 htaborg = SDR1_HTABORG(PowerPC::ppcState.spr[SPR_SDR]);
	if (htaborg & xx)
	{
		return;
	}
	PowerPC::ppcState.pagetable_base = htaborg<<16;
	PowerPC::ppcState.pagetable_hashmask = ((xx<<10)|0x3ff);
}

enum TLBLookupResult
{
	TLB_FOUND,
	TLB_NOTFOUND,
	TLB_UPDATE_C
};

static __forceinline TLBLookupResult LookupTLBPageAddress(const XCheckTLBFlag flag, const u32 vpa, u32 *paddr)
{
	u32 tag = vpa >> HW_PAGE_INDEX_SHIFT;
	PowerPC::tlb_entry *tlbe = &PowerPC::ppcState.tlb[flag == FLAG_OPCODE][tag & HW_PAGE_INDEX_MASK];
	if (tlbe->tag[0] == tag)
	{
		// Check if C bit requires updating
		if (flag == FLAG_WRITE)
		{
			UPTE2 PTE2;
			PTE2.Hex = tlbe->pte[0];
			if (PTE2.C == 0)
			{
				PTE2.C = 1;
				tlbe->pte[0] = PTE2.Hex;
				return TLB_UPDATE_C;
			}
		}

		if (flag != FLAG_NO_EXCEPTION)
			tlbe->recent = 0;

		*paddr = tlbe->paddr[0] | (vpa & 0xfff);

		return TLB_FOUND;
	}
	if (tlbe->tag[1] == tag)
	{
		// Check if C bit requires updating
		if (flag == FLAG_WRITE)
		{
			UPTE2 PTE2;
			PTE2.Hex = tlbe->pte[1];
			if (PTE2.C == 0)
			{
				PTE2.C = 1;
				tlbe->pte[1] = PTE2.Hex;
				return TLB_UPDATE_C;
			}
		}

		if (flag != FLAG_NO_EXCEPTION)
			tlbe->recent = 1;

		*paddr = tlbe->paddr[1] | (vpa & 0xfff);

		return TLB_FOUND;
	}
	return TLB_NOTFOUND;
}

static __forceinline void UpdateTLBEntry(const XCheckTLBFlag flag, UPTE2 PTE2, const u32 address)
{
	if (flag == FLAG_NO_EXCEPTION)
		return;

	int tag = address >> HW_PAGE_INDEX_SHIFT;
	PowerPC::tlb_entry *tlbe = &PowerPC::ppcState.tlb[flag == FLAG_OPCODE][tag & HW_PAGE_INDEX_MASK];
	int index = tlbe->recent == 0 && tlbe->tag[0] != TLB_TAG_INVALID;
	tlbe->recent = index;
	tlbe->paddr[index] = PTE2.RPN << HW_PAGE_INDEX_SHIFT;
	tlbe->pte[index] = PTE2.Hex;
	tlbe->tag[index] = tag;
}

void InvalidateTLBEntry(u32 address)
{
	PowerPC::tlb_entry *tlbe = &PowerPC::ppcState.tlb[0][(address >> HW_PAGE_INDEX_SHIFT) & HW_PAGE_INDEX_MASK];
	tlbe->tag[0] = TLB_TAG_INVALID;
	tlbe->tag[1] = TLB_TAG_INVALID;
	PowerPC::tlb_entry *tlbe_i = &PowerPC::ppcState.tlb[1][(address >> HW_PAGE_INDEX_SHIFT) & HW_PAGE_INDEX_MASK];
	tlbe_i->tag[0] = TLB_TAG_INVALID;
	tlbe_i->tag[1] = TLB_TAG_INVALID;
}

// Page Address Translation
static __forceinline u32 TranslatePageAddress(const u32 address, const XCheckTLBFlag flag)
{
	// TLB cache
	// This catches 99%+ of lookups in practice, so the actual page table entry code below doesn't benefit
	// much from optimization.
	u32 translatedAddress = 0;
	TLBLookupResult res = LookupTLBPageAddress(flag , address, &translatedAddress);
	if (res == TLB_FOUND)
		return translatedAddress;

	u32 sr = PowerPC::ppcState.sr[EA_SR(address)];

	u32 offset = EA_Offset(address);        // 12 bit
	u32 page_index = EA_PageIndex(address); // 16 bit
	u32 VSID = SR_VSID(sr);                  // 24 bit
	u32 api = EA_API(address);              //  6 bit (part of page_index)

	// hash function no 1 "xor" .360
	u32 hash = (VSID ^ page_index);
	u32 pte1 = bswap((VSID << 7) | api | PTE1_V);

	for (int hash_func = 0; hash_func < 2; hash_func++)
	{
		// hash function no 2 "not" .360
		if (hash_func == 1)
		{
			hash = ~hash;
			pte1 |= PTE1_H << 24;
		}

		u32 pteg_addr = ((hash & PowerPC::ppcState.pagetable_hashmask) << 6) | PowerPC::ppcState.pagetable_base;

		for (int i = 0; i < 8; i++, pteg_addr += 8)
		{
			if (pte1 == *(u32*)&Memory::physical_base[pteg_addr])
			{
				UPTE2 PTE2;
				PTE2.Hex = bswap((*(u32*)&Memory::physical_base[pteg_addr + 4]));

				// set the access bits
				switch (flag)
				{
				case FLAG_NO_EXCEPTION: break;
				case FLAG_READ:     PTE2.R = 1; break;
				case FLAG_WRITE:    PTE2.R = 1; PTE2.C = 1; break;
				case FLAG_OPCODE:   PTE2.R = 1; break;
				}

				if (flag != FLAG_NO_EXCEPTION)
					*(u32*)&Memory::physical_base[pteg_addr + 4] = bswap(PTE2.Hex);

				// We already updated the TLB entry if this was caused by a C bit.
				if (res != TLB_UPDATE_C)
					UpdateTLBEntry(flag, PTE2, address);

				return (PTE2.RPN << 12) | offset;
			}
		}
	}
	return 0;
}

// Translate effective address using BAT or PAT.  Returns 0 if the address cannot be translated.
template <const XCheckTLBFlag flag>
__forceinline u32 TranslateAddress(const u32 address)
{
	// TODO: Perform BAT translation.  (At the moment, we hardcode an assumed BAT
	// configuration, so there's no reason to actually check the registers.)
	return TranslatePageAddress(address, flag);
}

} // namespace