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Memmap.cpp
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Memmap.cpp
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// Copyright 2013 Dolphin Emulator Project
// Licensed under GPLv2
// Refer to the license.txt file included.
// NOTE:
// These functions are primarily used by the interpreter versions of the LoadStore instructions.
// However, if a JITed instruction (for example lwz) wants to access a bad memory area that call
// may be redirected here (for example to Read_U32()).
#include "Common/ChunkFile.h"
#include "Common/CommonTypes.h"
#include "Common/MemArena.h"
#include "Common/MemoryUtil.h"
#include "Core/ConfigManager.h"
#include "Core/Core.h"
#include "Core/Debugger/Debugger_SymbolMap.h"
#include "Core/HLE/HLE.h"
#include "Core/HW/AudioInterface.h"
#include "Core/HW/CPU.h"
#include "Core/HW/DSP.h"
#include "Core/HW/DVDInterface.h"
#include "Core/HW/EXI.h"
#include "Core/HW/GPFifo.h"
#include "Core/HW/Memmap.h"
#include "Core/HW/MemoryInterface.h"
#include "Core/HW/MMIO.h"
#include "Core/HW/ProcessorInterface.h"
#include "Core/HW/SI.h"
#include "Core/HW/VideoInterface.h"
#include "Core/HW/WII_IPC.h"
#include "Core/PowerPC/PowerPC.h"
#include "Core/PowerPC/JitCommon/JitBase.h"
#include "VideoCommon/PixelEngine.h"
#include "VideoCommon/VideoBackendBase.h"
namespace Memory
{
// =================================
// LOCAL SETTINGS
// ----------------
// Enable the Translation Lookaside Buffer functions.
bool bFakeVMEM = false;
static bool bMMU = false;
// ==============
// =================================
// Init() declarations
// ----------------
// Store the MemArena here
u8* physical_base = nullptr;
u8* logical_base = nullptr;
// The MemArena class
static MemArena g_arena;
// ==============
// STATE_TO_SAVE
static bool m_IsInitialized = false; // Save the Init(), Shutdown() state
// END STATE_TO_SAVE
u8* m_pRAM;
u8* m_pL1Cache;
u8* m_pEXRAM;
u8* m_pFakeVMEM;
// MMIO mapping object.
MMIO::Mapping* mmio_mapping;
static void InitMMIO(MMIO::Mapping* mmio)
{
g_video_backend->RegisterCPMMIO(mmio, 0x0C000000);
PixelEngine::RegisterMMIO(mmio, 0x0C001000);
VideoInterface::RegisterMMIO(mmio, 0x0C002000);
ProcessorInterface::RegisterMMIO(mmio, 0x0C003000);
MemoryInterface::RegisterMMIO(mmio, 0x0C004000);
DSP::RegisterMMIO(mmio, 0x0C005000);
DVDInterface::RegisterMMIO(mmio, 0x0C006000);
SerialInterface::RegisterMMIO(mmio, 0x0C006400);
ExpansionInterface::RegisterMMIO(mmio, 0x0C006800);
AudioInterface::RegisterMMIO(mmio, 0x0C006C00);
}
static void InitMMIOWii(MMIO::Mapping* mmio)
{
InitMMIO(mmio);
WII_IPCInterface::RegisterMMIO(mmio, 0x0D000000);
DVDInterface::RegisterMMIO(mmio, 0x0D006000);
SerialInterface::RegisterMMIO(mmio, 0x0D006400);
ExpansionInterface::RegisterMMIO(mmio, 0x0D006800);
AudioInterface::RegisterMMIO(mmio, 0x0D006C00);
}
bool IsInitialized()
{
return m_IsInitialized;
}
// Dolphin allocates memory to represent four regions:
// - 32MB RAM (actually 24MB on hardware), available on Gamecube and Wii
// - 64MB "EXRAM", RAM only available on Wii
// - 32MB FakeVMem, allocated when MMU support is turned off. This is used
// to approximate the behavior of a common library which pages memory to
// and from the DSP's dedicated RAM, which isn't directly addressable on
// GameCube.
// - 256KB Locked L1, to represent cache lines allocated out of the L1 data
// cache in Locked L1 mode. Dolphin does not emulate this hardware feature
// accurately; it just pretends there is extra memory at 0xE0000000.
//
// The 4GB starting at physical_base represents access from the CPU
// with address translation turned off. (This is only used by the CPU;
// other devices, like the GPU, use other rules, approximated by
// Memory::GetPointer.) This memory is laid out as follows:
// [0x00000000, 0x01800000) - 24MB RAM
// [0x08000000, 0x0C000000) - EFB "mapping" (not handled here)
// [0x0C000000, 0x0E000000) - MMIO etc. (not handled here)
// [0x10000000, 0x14000000) - 64MB RAM (Wii-only; slightly slower)
//
// The 4GB starting at logical_base represents access from the CPU
// with address translation turned on. Instead of changing the mapping
// based on the BAT registers, we approximate the common BAT configuration
// used by games:
// [0x00000000, 0x01800000) - 24MB RAM, cached access, normally only mapped
// during startup by Wii WADs
// [0x40000000, 0x50000000) - FakeVMEM
// [0x70000000, 0x80000000) - FakeVMEM
// [0x80000000, 0x81800000) - 24MB RAM, cached access
// [0x90000000, 0x94000000) - 64MB RAM, Wii-only, cached access
// [0xC0000000, 0xC1800000) - 24MB RAM, uncached access
// [0xC8000000, 0xCC000000) - EFB "mapping" (not handled here)
// [0xCC000000, 0xCE000000) - MMIO etc. (not handled here)
// [0xD0000000, 0xD4000000) - 64MB RAM, Wii-only, uncached access
// [0xE0000000, 0xE0040000) - 256KB locked L1
//
// TODO: We shouldn't hardcode this mapping; we can generate it dynamically
// based on the BAT registers.
//
// Each of these 4GB regions is followed by 4GB of empty space so overflows
// in address computation in the JIT don't access the wrong memory.
//
// Dolphin doesn't emulate the difference between cached and uncached access.
static MemoryView views[] =
{
{&m_pRAM, 0x00000000, RAM_SIZE, 0},
{nullptr, 0x200000000, RAM_SIZE, MV_MIRROR_PREVIOUS},
{nullptr, 0x280000000, RAM_SIZE, MV_MIRROR_PREVIOUS},
{nullptr, 0x2C0000000, RAM_SIZE, MV_MIRROR_PREVIOUS},
{&m_pL1Cache, 0x2E0000000, L1_CACHE_SIZE, 0},
{&m_pFakeVMEM, 0x27E000000, FAKEVMEM_SIZE, MV_FAKE_VMEM},
{&m_pEXRAM, 0x10000000, EXRAM_SIZE, MV_WII_ONLY},
{nullptr, 0x290000000, EXRAM_SIZE, MV_WII_ONLY | MV_MIRROR_PREVIOUS},
{nullptr, 0x2D0000000, EXRAM_SIZE, MV_WII_ONLY | MV_MIRROR_PREVIOUS},
};
static const int num_views = sizeof(views) / sizeof(MemoryView);
void Init()
{
bool wii = SConfig::GetInstance().m_LocalCoreStartupParameter.bWii;
bMMU = SConfig::GetInstance().m_LocalCoreStartupParameter.bMMU;
#ifndef _ARCH_32
// The fake VMEM hack's address space is above the memory space that we allocate on 32bit targets
// Disable it entirely on 32bit targets.
bFakeVMEM = !bMMU;
#endif
u32 flags = 0;
if (wii) flags |= MV_WII_ONLY;
if (bFakeVMEM) flags |= MV_FAKE_VMEM;
physical_base = MemoryMap_Setup(views, num_views, flags, &g_arena);
#ifndef _ARCH_32
logical_base = physical_base + 0x200000000;
#endif
mmio_mapping = new MMIO::Mapping();
if (wii)
InitMMIOWii(mmio_mapping);
else
InitMMIO(mmio_mapping);
INFO_LOG(MEMMAP, "Memory system initialized. RAM at %p", m_pRAM);
m_IsInitialized = true;
}
void DoState(PointerWrap &p)
{
bool wii = SConfig::GetInstance().m_LocalCoreStartupParameter.bWii;
p.DoArray(m_pRAM, RAM_SIZE);
p.DoArray(m_pL1Cache, L1_CACHE_SIZE);
p.DoMarker("Memory RAM");
if (bFakeVMEM)
p.DoArray(m_pFakeVMEM, FAKEVMEM_SIZE);
p.DoMarker("Memory FakeVMEM");
if (wii)
p.DoArray(m_pEXRAM, EXRAM_SIZE);
p.DoMarker("Memory EXRAM");
}
void Shutdown()
{
m_IsInitialized = false;
u32 flags = 0;
if (SConfig::GetInstance().m_LocalCoreStartupParameter.bWii) flags |= MV_WII_ONLY;
if (bFakeVMEM) flags |= MV_FAKE_VMEM;
MemoryMap_Shutdown(views, num_views, flags, &g_arena);
g_arena.ReleaseSHMSegment();
physical_base = nullptr;
logical_base = nullptr;
delete mmio_mapping;
INFO_LOG(MEMMAP, "Memory system shut down.");
}
void Clear()
{
if (m_pRAM)
memset(m_pRAM, 0, RAM_SIZE);
if (m_pL1Cache)
memset(m_pL1Cache, 0, L1_CACHE_SIZE);
if (SConfig::GetInstance().m_LocalCoreStartupParameter.bWii && m_pEXRAM)
memset(m_pEXRAM, 0, EXRAM_SIZE);
}
bool AreMemoryBreakpointsActivated()
{
#ifndef ENABLE_MEM_CHECK
return false;
#else
return true;
#endif
}
static inline bool ValidCopyRange(u32 address, size_t size)
{
return (GetPointer(address) != nullptr &&
GetPointer(address + u32(size)) != nullptr &&
size < EXRAM_SIZE); // Make sure we don't have a range spanning seperate 2 banks
}
void CopyFromEmu(void* data, u32 address, size_t size)
{
if (!ValidCopyRange(address, size))
{
PanicAlert("Invalid range in CopyFromEmu. %lx bytes from 0x%08x", (unsigned long)size, address);
return;
}
memcpy(data, GetPointer(address), size);
}
void CopyToEmu(u32 address, const void* data, size_t size)
{
if (!ValidCopyRange(address, size))
{
PanicAlert("Invalid range in CopyToEmu. %lx bytes to 0x%08x", (unsigned long)size, address);
return;
}
memcpy(GetPointer(address), data, size);
}
void Memset(const u32 _Address, const u8 _iValue, const u32 _iLength)
{
u8* ptr = GetPointer(_Address);
if (ptr != nullptr)
{
memset(ptr,_iValue,_iLength);
}
}
std::string GetString(u32 em_address, size_t size)
{
const char* ptr = reinterpret_cast<const char*>(GetPointer(em_address));
if (ptr == nullptr)
return "";
if (size == 0) // Null terminated string.
{
return std::string(ptr);
}
else // Fixed size string, potentially null terminated or null padded.
{
size_t length = strnlen(ptr, size);
return std::string(ptr, length);
}
}
u8* GetPointer(u32 address)
{
// TODO: Should we be masking off more bits here? Can all devices access
// EXRAM?
address &= 0x3FFFFFFF;
if (address < REALRAM_SIZE)
return m_pRAM + address;
if (SConfig::GetInstance().m_LocalCoreStartupParameter.bWii)
{
if ((address >> 28) == 0x1 && (address & 0x0fffffff) < EXRAM_SIZE)
return m_pEXRAM + (address & EXRAM_MASK);
}
PanicAlert("Unknown Pointer 0x%08x PC 0x%08x LR 0x%08x", address, PC, LR);
return nullptr;
}
u8 Read_U8(u32 address)
{
return *GetPointer(address);
}
u16 Read_U16(u32 address)
{
return Common::swap16(GetPointer(address));
}
u32 Read_U32(u32 address)
{
return Common::swap32(GetPointer(address));
}
u64 Read_U64(u32 address)
{
return Common::swap64(GetPointer(address));
}
void Write_U8(u8 value, u32 address)
{
*GetPointer(address) = value;
}
void Write_U16(u16 value, u32 address)
{
*(u16*)GetPointer(address) = Common::swap16(value);
}
void Write_U32(u32 value, u32 address)
{
*(u32*)GetPointer(address) = Common::swap32(value);
}
void Write_U64(u64 value, u32 address)
{
*(u64*)GetPointer(address) = Common::swap64(value);
}
void Write_U32_Swap(u32 value, u32 address)
{
*(u32*)GetPointer(address) = value;
}
void Write_U64_Swap(u64 value, u32 address)
{
*(u64*)GetPointer(address) = value;
}
} // namespace