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citra-canary/src/core/memory.cpp

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// Copyright 2015 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <array>
#include <cstring>
#include <boost/serialization/array.hpp>
#include <boost/serialization/binary_object.hpp>
#include "audio_core/dsp_interface.h"
#include "common/archives.h"
#include "common/assert.h"
#include "common/atomic_ops.h"
#include "common/common_types.h"
#include "common/logging/log.h"
#include "common/settings.h"
#include "common/swap.h"
#include "core/arm/arm_interface.h"
#include "core/core.h"
#include "core/global.h"
#include "core/hle/kernel/memory.h"
#include "core/hle/kernel/process.h"
#include "core/hle/lock.h"
#include "core/hle/service/plgldr/plgldr.h"
#include "core/hw/hw.h"
#include "core/memory.h"
#include "video_core/renderer_base.h"
#include "video_core/video_core.h"
SERIALIZE_EXPORT_IMPL(Memory::MemorySystem::BackingMemImpl<Memory::Region::FCRAM>)
SERIALIZE_EXPORT_IMPL(Memory::MemorySystem::BackingMemImpl<Memory::Region::VRAM>)
SERIALIZE_EXPORT_IMPL(Memory::MemorySystem::BackingMemImpl<Memory::Region::DSP>)
SERIALIZE_EXPORT_IMPL(Memory::MemorySystem::BackingMemImpl<Memory::Region::N3DS>)
namespace Memory {
void PageTable::Clear() {
pointers.raw.fill(nullptr);
pointers.refs.fill(MemoryRef());
attributes.fill(PageType::Unmapped);
}
class RasterizerCacheMarker {
public:
void Mark(VAddr addr, bool cached) {
bool* p = At(addr);
if (p)
*p = cached;
}
bool IsCached(VAddr addr) {
bool* p = At(addr);
if (p)
return *p;
return false;
}
private:
bool* At(VAddr addr) {
if (addr >= VRAM_VADDR && addr < VRAM_VADDR_END) {
return &vram[(addr - VRAM_VADDR) / CITRA_PAGE_SIZE];
}
if (addr >= LINEAR_HEAP_VADDR && addr < LINEAR_HEAP_VADDR_END) {
return &linear_heap[(addr - LINEAR_HEAP_VADDR) / CITRA_PAGE_SIZE];
}
if (addr >= NEW_LINEAR_HEAP_VADDR && addr < NEW_LINEAR_HEAP_VADDR_END) {
return &new_linear_heap[(addr - NEW_LINEAR_HEAP_VADDR) / CITRA_PAGE_SIZE];
}
if (addr >= PLUGIN_3GX_FB_VADDR && addr < PLUGIN_3GX_FB_VADDR_END) {
return &plugin_fb[(addr - PLUGIN_3GX_FB_VADDR) / CITRA_PAGE_SIZE];
}
return nullptr;
}
std::array<bool, VRAM_SIZE / CITRA_PAGE_SIZE> vram{};
std::array<bool, LINEAR_HEAP_SIZE / CITRA_PAGE_SIZE> linear_heap{};
std::array<bool, NEW_LINEAR_HEAP_SIZE / CITRA_PAGE_SIZE> new_linear_heap{};
std::array<bool, PLUGIN_3GX_FB_SIZE / CITRA_PAGE_SIZE> plugin_fb{};
static_assert(sizeof(bool) == 1);
friend class boost::serialization::access;
template <typename Archive>
void serialize(Archive& ar, const unsigned int file_version) {
ar& vram;
ar& linear_heap;
ar& new_linear_heap;
ar& plugin_fb;
}
};
class MemorySystem::Impl {
public:
// Visual Studio would try to allocate these on compile time if they are std::array, which would
// exceed the memory limit.
std::unique_ptr<u8[]> fcram = std::make_unique<u8[]>(Memory::FCRAM_N3DS_SIZE);
std::unique_ptr<u8[]> vram = std::make_unique<u8[]>(Memory::VRAM_SIZE);
std::unique_ptr<u8[]> n3ds_extra_ram = std::make_unique<u8[]>(Memory::N3DS_EXTRA_RAM_SIZE);
std::shared_ptr<PageTable> current_page_table = nullptr;
RasterizerCacheMarker cache_marker;
std::vector<std::shared_ptr<PageTable>> page_table_list;
AudioCore::DspInterface* dsp = nullptr;
std::shared_ptr<BackingMem> fcram_mem;
std::shared_ptr<BackingMem> vram_mem;
std::shared_ptr<BackingMem> n3ds_extra_ram_mem;
std::shared_ptr<BackingMem> dsp_mem;
Impl();
const u8* GetPtr(Region r) const {
switch (r) {
case Region::VRAM:
return vram.get();
case Region::DSP:
return dsp->GetDspMemory().data();
case Region::FCRAM:
return fcram.get();
case Region::N3DS:
return n3ds_extra_ram.get();
default:
UNREACHABLE();
}
}
u8* GetPtr(Region r) {
switch (r) {
case Region::VRAM:
return vram.get();
case Region::DSP:
return dsp->GetDspMemory().data();
case Region::FCRAM:
return fcram.get();
case Region::N3DS:
return n3ds_extra_ram.get();
default:
UNREACHABLE();
}
}
u32 GetSize(Region r) const {
switch (r) {
case Region::VRAM:
return VRAM_SIZE;
case Region::DSP:
return DSP_RAM_SIZE;
case Region::FCRAM:
return FCRAM_N3DS_SIZE;
case Region::N3DS:
return N3DS_EXTRA_RAM_SIZE;
default:
UNREACHABLE();
}
}
/**
* This function should only be called for virtual addreses with attribute `PageType::Special`.
*/
MMIORegionPointer GetMMIOHandler(const PageTable& page_table, VAddr vaddr) {
for (const auto& region : page_table.special_regions) {
if (vaddr >= region.base && vaddr < (region.base + region.size)) {
return region.handler;
}
}
ASSERT_MSG(false, "Mapped IO page without a handler @ {:08X}", vaddr);
return nullptr; // Should never happen
}
template <bool UNSAFE>
void ReadBlockImpl(const Kernel::Process& process, const VAddr src_addr, void* dest_buffer,
const std::size_t size) {
auto& page_table = *process.vm_manager.page_table;
std::size_t remaining_size = size;
std::size_t page_index = src_addr >> CITRA_PAGE_BITS;
std::size_t page_offset = src_addr & CITRA_PAGE_MASK;
while (remaining_size > 0) {
const std::size_t copy_amount = std::min(CITRA_PAGE_SIZE - page_offset, remaining_size);
const VAddr current_vaddr =
static_cast<VAddr>((page_index << CITRA_PAGE_BITS) + page_offset);
switch (page_table.attributes[page_index]) {
case PageType::Unmapped: {
LOG_ERROR(
HW_Memory,
"unmapped ReadBlock @ 0x{:08X} (start address = 0x{:08X}, size = {}) at PC "
"0x{:08X}",
current_vaddr, src_addr, size, Core::GetRunningCore().GetPC());
std::memset(dest_buffer, 0, copy_amount);
break;
}
case PageType::Memory: {
DEBUG_ASSERT(page_table.pointers[page_index]);
const u8* src_ptr = page_table.pointers[page_index] + page_offset;
std::memcpy(dest_buffer, src_ptr, copy_amount);
break;
}
case PageType::Special: {
MMIORegionPointer handler = GetMMIOHandler(page_table, current_vaddr);
DEBUG_ASSERT(handler);
handler->ReadBlock(current_vaddr, dest_buffer, copy_amount);
break;
}
case PageType::RasterizerCachedMemory: {
if constexpr (!UNSAFE) {
RasterizerFlushVirtualRegion(current_vaddr, static_cast<u32>(copy_amount),
FlushMode::Flush);
}
std::memcpy(dest_buffer, GetPointerForRasterizerCache(current_vaddr), copy_amount);
break;
}
default:
UNREACHABLE();
}
page_index++;
page_offset = 0;
dest_buffer = static_cast<u8*>(dest_buffer) + copy_amount;
remaining_size -= copy_amount;
}
}
template <bool UNSAFE>
void WriteBlockImpl(const Kernel::Process& process, const VAddr dest_addr,
const void* src_buffer, const std::size_t size) {
auto& page_table = *process.vm_manager.page_table;
std::size_t remaining_size = size;
std::size_t page_index = dest_addr >> CITRA_PAGE_BITS;
std::size_t page_offset = dest_addr & CITRA_PAGE_MASK;
while (remaining_size > 0) {
const std::size_t copy_amount = std::min(CITRA_PAGE_SIZE - page_offset, remaining_size);
const VAddr current_vaddr =
static_cast<VAddr>((page_index << CITRA_PAGE_BITS) + page_offset);
switch (page_table.attributes[page_index]) {
case PageType::Unmapped: {
LOG_ERROR(
HW_Memory,
"unmapped WriteBlock @ 0x{:08X} (start address = 0x{:08X}, size = {}) at PC "
"0x{:08X}",
current_vaddr, dest_addr, size, Core::GetRunningCore().GetPC());
break;
}
case PageType::Memory: {
DEBUG_ASSERT(page_table.pointers[page_index]);
u8* dest_ptr = page_table.pointers[page_index] + page_offset;
std::memcpy(dest_ptr, src_buffer, copy_amount);
break;
}
case PageType::Special: {
MMIORegionPointer handler = GetMMIOHandler(page_table, current_vaddr);
DEBUG_ASSERT(handler);
handler->WriteBlock(current_vaddr, src_buffer, copy_amount);
break;
}
case PageType::RasterizerCachedMemory: {
if constexpr (!UNSAFE) {
RasterizerFlushVirtualRegion(current_vaddr, static_cast<u32>(copy_amount),
FlushMode::Invalidate);
}
std::memcpy(GetPointerForRasterizerCache(current_vaddr), src_buffer, copy_amount);
break;
}
default:
UNREACHABLE();
}
page_index++;
page_offset = 0;
src_buffer = static_cast<const u8*>(src_buffer) + copy_amount;
remaining_size -= copy_amount;
}
}
MemoryRef GetPointerForRasterizerCache(VAddr addr) const {
if (addr >= LINEAR_HEAP_VADDR && addr < LINEAR_HEAP_VADDR_END) {
return {fcram_mem, addr - LINEAR_HEAP_VADDR};
}
if (addr >= NEW_LINEAR_HEAP_VADDR && addr < NEW_LINEAR_HEAP_VADDR_END) {
return {fcram_mem, addr - NEW_LINEAR_HEAP_VADDR};
}
if (addr >= VRAM_VADDR && addr < VRAM_VADDR_END) {
return {vram_mem, addr - VRAM_VADDR};
}
if (addr >= PLUGIN_3GX_FB_VADDR && addr < PLUGIN_3GX_FB_VADDR_END) {
return {fcram_mem, addr - PLUGIN_3GX_FB_VADDR +
Service::PLGLDR::PLG_LDR::GetPluginFBAddr() - FCRAM_PADDR};
}
UNREACHABLE();
return MemoryRef{};
}
private:
friend class boost::serialization::access;
template <class Archive>
void serialize(Archive& ar, const unsigned int file_version) {
bool save_n3ds_ram = Settings::values.is_new_3ds.GetValue();
ar& save_n3ds_ram;
ar& boost::serialization::make_binary_object(vram.get(), Memory::VRAM_SIZE);
ar& boost::serialization::make_binary_object(
fcram.get(), save_n3ds_ram ? Memory::FCRAM_N3DS_SIZE : Memory::FCRAM_SIZE);
ar& boost::serialization::make_binary_object(
n3ds_extra_ram.get(), save_n3ds_ram ? Memory::N3DS_EXTRA_RAM_SIZE : 0);
ar& cache_marker;
ar& page_table_list;
// dsp is set from Core::System at startup
ar& current_page_table;
ar& fcram_mem;
ar& vram_mem;
ar& n3ds_extra_ram_mem;
ar& dsp_mem;
}
};
// We use this rather than BufferMem because we don't want new objects to be allocated when
// deserializing. This avoids unnecessary memory thrashing.
template <Region R>
class MemorySystem::BackingMemImpl : public BackingMem {
public:
BackingMemImpl() : impl(*Core::Global<Core::System>().Memory().impl) {}
explicit BackingMemImpl(MemorySystem::Impl& impl_) : impl(impl_) {}
u8* GetPtr() override {
return impl.GetPtr(R);
}
const u8* GetPtr() const override {
return impl.GetPtr(R);
}
std::size_t GetSize() const override {
return impl.GetSize(R);
}
private:
MemorySystem::Impl& impl;
template <class Archive>
void serialize(Archive& ar, const unsigned int) {
ar& boost::serialization::base_object<BackingMem>(*this);
}
friend class boost::serialization::access;
};
MemorySystem::Impl::Impl()
: fcram_mem(std::make_shared<BackingMemImpl<Region::FCRAM>>(*this)),
vram_mem(std::make_shared<BackingMemImpl<Region::VRAM>>(*this)),
n3ds_extra_ram_mem(std::make_shared<BackingMemImpl<Region::N3DS>>(*this)),
dsp_mem(std::make_shared<BackingMemImpl<Region::DSP>>(*this)) {}
MemorySystem::MemorySystem() : impl(std::make_unique<Impl>()) {}
MemorySystem::~MemorySystem() = default;
template <class Archive>
void MemorySystem::serialize(Archive& ar, const unsigned int file_version) {
ar&* impl.get();
}
SERIALIZE_IMPL(MemorySystem)
void MemorySystem::SetCurrentPageTable(std::shared_ptr<PageTable> page_table) {
impl->current_page_table = page_table;
}
std::shared_ptr<PageTable> MemorySystem::GetCurrentPageTable() const {
return impl->current_page_table;
}
void MemorySystem::MapPages(PageTable& page_table, u32 base, u32 size, MemoryRef memory,
PageType type) {
LOG_DEBUG(HW_Memory, "Mapping {} onto {:08X}-{:08X}", (void*)memory.GetPtr(),
base * CITRA_PAGE_SIZE, (base + size) * CITRA_PAGE_SIZE);
RasterizerFlushVirtualRegion(base << CITRA_PAGE_BITS, size * CITRA_PAGE_SIZE,
FlushMode::FlushAndInvalidate);
u32 end = base + size;
while (base != end) {
ASSERT_MSG(base < PAGE_TABLE_NUM_ENTRIES, "out of range mapping at {:08X}", base);
page_table.attributes[base] = type;
page_table.pointers[base] = memory;
// If the memory to map is already rasterizer-cached, mark the page
if (type == PageType::Memory && impl->cache_marker.IsCached(base * CITRA_PAGE_SIZE)) {
page_table.attributes[base] = PageType::RasterizerCachedMemory;
page_table.pointers[base] = nullptr;
}
base += 1;
if (memory != nullptr && memory.GetSize() > CITRA_PAGE_SIZE)
memory += CITRA_PAGE_SIZE;
}
}
void MemorySystem::MapMemoryRegion(PageTable& page_table, VAddr base, u32 size, MemoryRef target) {
ASSERT_MSG((size & CITRA_PAGE_MASK) == 0, "non-page aligned size: {:08X}", size);
ASSERT_MSG((base & CITRA_PAGE_MASK) == 0, "non-page aligned base: {:08X}", base);
MapPages(page_table, base / CITRA_PAGE_SIZE, size / CITRA_PAGE_SIZE, target, PageType::Memory);
}
void MemorySystem::MapIoRegion(PageTable& page_table, VAddr base, u32 size,
MMIORegionPointer mmio_handler) {
ASSERT_MSG((size & CITRA_PAGE_MASK) == 0, "non-page aligned size: {:08X}", size);
ASSERT_MSG((base & CITRA_PAGE_MASK) == 0, "non-page aligned base: {:08X}", base);
MapPages(page_table, base / CITRA_PAGE_SIZE, size / CITRA_PAGE_SIZE, nullptr,
PageType::Special);
page_table.special_regions.emplace_back(SpecialRegion{base, size, mmio_handler});
}
void MemorySystem::UnmapRegion(PageTable& page_table, VAddr base, u32 size) {
ASSERT_MSG((size & CITRA_PAGE_MASK) == 0, "non-page aligned size: {:08X}", size);
ASSERT_MSG((base & CITRA_PAGE_MASK) == 0, "non-page aligned base: {:08X}", base);
MapPages(page_table, base / CITRA_PAGE_SIZE, size / CITRA_PAGE_SIZE, nullptr,
PageType::Unmapped);
}
MemoryRef MemorySystem::GetPointerForRasterizerCache(VAddr addr) const {
return impl->GetPointerForRasterizerCache(addr);
}
void MemorySystem::RegisterPageTable(std::shared_ptr<PageTable> page_table) {
impl->page_table_list.push_back(page_table);
}
void MemorySystem::UnregisterPageTable(std::shared_ptr<PageTable> page_table) {
auto it = std::find(impl->page_table_list.begin(), impl->page_table_list.end(), page_table);
if (it != impl->page_table_list.end()) {
impl->page_table_list.erase(it);
}
}
template <typename T>
T ReadMMIO(MMIORegionPointer mmio_handler, VAddr addr);
template <typename T>
T MemorySystem::Read(const VAddr vaddr) {
const u8* page_pointer = impl->current_page_table->pointers[vaddr >> CITRA_PAGE_BITS];
if (page_pointer) {
// NOTE: Avoid adding any extra logic to this fast-path block
T value;
std::memcpy(&value, &page_pointer[vaddr & CITRA_PAGE_MASK], sizeof(T));
return value;
}
// Custom Luma3ds mapping
// Is there a more efficient way to do this?
if (vaddr & (1 << 31)) {
PAddr paddr = (vaddr & ~(1 << 31));
if ((paddr & 0xF0000000) == Memory::FCRAM_PADDR) { // Check FCRAM region
T value;
std::memcpy(&value, GetFCRAMPointer(paddr - Memory::FCRAM_PADDR), sizeof(T));
return value;
} else if ((paddr & 0xF0000000) == 0x10000000 &&
paddr >= Memory::IO_AREA_PADDR) { // Check MMIO region
T ret;
HW::Read<T>(ret, static_cast<VAddr>(paddr) - Memory::IO_AREA_PADDR + 0x1EC00000);
return ret;
}
}
PageType type = impl->current_page_table->attributes[vaddr >> CITRA_PAGE_BITS];
switch (type) {
case PageType::Unmapped:
LOG_ERROR(HW_Memory, "unmapped Read{} @ 0x{:08X} at PC 0x{:08X}", sizeof(T) * 8, vaddr,
Core::GetRunningCore().GetPC());
return 0;
case PageType::Memory:
ASSERT_MSG(false, "Mapped memory page without a pointer @ {:08X}", vaddr);
break;
case PageType::RasterizerCachedMemory: {
RasterizerFlushVirtualRegion(vaddr, sizeof(T), FlushMode::Flush);
T value;
std::memcpy(&value, GetPointerForRasterizerCache(vaddr), sizeof(T));
return value;
}
case PageType::Special:
return ReadMMIO<T>(impl->GetMMIOHandler(*impl->current_page_table, vaddr), vaddr);
default:
UNREACHABLE();
}
return T{};
}
template <typename T>
void WriteMMIO(MMIORegionPointer mmio_handler, VAddr addr, const T data);
template <typename T>
void MemorySystem::Write(const VAddr vaddr, const T data) {
u8* page_pointer = impl->current_page_table->pointers[vaddr >> CITRA_PAGE_BITS];
if (page_pointer) {
// NOTE: Avoid adding any extra logic to this fast-path block
std::memcpy(&page_pointer[vaddr & CITRA_PAGE_MASK], &data, sizeof(T));
return;
}
// Custom Luma3ds mapping
// Is there a more efficient way to do this?
if (vaddr & (1 << 31)) {
PAddr paddr = (vaddr & ~(1 << 31));
if ((paddr & 0xF0000000) == Memory::FCRAM_PADDR) { // Check FCRAM region
std::memcpy(GetFCRAMPointer(paddr - Memory::FCRAM_PADDR), &data, sizeof(T));
return;
} else if ((paddr & 0xF0000000) == 0x10000000 &&
paddr >= Memory::IO_AREA_PADDR) { // Check MMIO region
HW::Write<T>(static_cast<VAddr>(paddr) - Memory::IO_AREA_PADDR + 0x1EC00000, data);
return;
}
}
PageType type = impl->current_page_table->attributes[vaddr >> CITRA_PAGE_BITS];
switch (type) {
case PageType::Unmapped:
LOG_ERROR(HW_Memory, "unmapped Write{} 0x{:08X} @ 0x{:08X} at PC 0x{:08X}",
sizeof(data) * 8, (u32)data, vaddr, Core::GetRunningCore().GetPC());
return;
case PageType::Memory:
ASSERT_MSG(false, "Mapped memory page without a pointer @ {:08X}", vaddr);
break;
case PageType::RasterizerCachedMemory: {
RasterizerFlushVirtualRegion(vaddr, sizeof(T), FlushMode::Invalidate);
std::memcpy(GetPointerForRasterizerCache(vaddr), &data, sizeof(T));
break;
}
case PageType::Special:
WriteMMIO<T>(impl->GetMMIOHandler(*impl->current_page_table, vaddr), vaddr, data);
break;
default:
UNREACHABLE();
}
}
template <typename T>
bool MemorySystem::WriteExclusive(const VAddr vaddr, const T data, const T expected) {
u8* page_pointer = impl->current_page_table->pointers[vaddr >> CITRA_PAGE_BITS];
if (page_pointer) {
const auto volatile_pointer =
reinterpret_cast<volatile T*>(&page_pointer[vaddr & CITRA_PAGE_MASK]);
return Common::AtomicCompareAndSwap(volatile_pointer, data, expected);
}
PageType type = impl->current_page_table->attributes[vaddr >> CITRA_PAGE_BITS];
switch (type) {
case PageType::Unmapped:
LOG_ERROR(HW_Memory, "unmapped Write{} 0x{:08X} @ 0x{:08X} at PC 0x{:08X}",
sizeof(data) * 8, (u32)data, vaddr, Core::GetRunningCore().GetPC());
return true;
case PageType::Memory:
ASSERT_MSG(false, "Mapped memory page without a pointer @ {:08X}", vaddr);
return true;
case PageType::RasterizerCachedMemory: {
RasterizerFlushVirtualRegion(vaddr, sizeof(T), FlushMode::Invalidate);
const auto volatile_pointer =
reinterpret_cast<volatile T*>(GetPointerForRasterizerCache(vaddr).GetPtr());
return Common::AtomicCompareAndSwap(volatile_pointer, data, expected);
}
case PageType::Special:
WriteMMIO<T>(impl->GetMMIOHandler(*impl->current_page_table, vaddr), vaddr, data);
return false;
default:
UNREACHABLE();
}
return true;
}
bool MemorySystem::IsValidVirtualAddress(const Kernel::Process& process, const VAddr vaddr) {
auto& page_table = *process.vm_manager.page_table;
auto page_pointer = page_table.pointers[vaddr >> CITRA_PAGE_BITS];
if (page_pointer)
return true;
if (page_table.attributes[vaddr >> CITRA_PAGE_BITS] == PageType::RasterizerCachedMemory)
return true;
if (page_table.attributes[vaddr >> CITRA_PAGE_BITS] != PageType::Special)
return false;
MMIORegionPointer mmio_region = impl->GetMMIOHandler(page_table, vaddr);
if (mmio_region) {
return mmio_region->IsValidAddress(vaddr);
}
return false;
}
bool MemorySystem::IsValidPhysicalAddress(const PAddr paddr) const {
return GetPhysicalRef(paddr);
}
u8* MemorySystem::GetPointer(const VAddr vaddr) {
u8* page_pointer = impl->current_page_table->pointers[vaddr >> CITRA_PAGE_BITS];
if (page_pointer) {
return page_pointer + (vaddr & CITRA_PAGE_MASK);
}
if (impl->current_page_table->attributes[vaddr >> CITRA_PAGE_BITS] ==
PageType::RasterizerCachedMemory) {
return GetPointerForRasterizerCache(vaddr);
}
LOG_ERROR(HW_Memory, "unknown GetPointer @ 0x{:08x} at PC 0x{:08X}", vaddr,
Core::GetRunningCore().GetPC());
return nullptr;
}
const u8* MemorySystem::GetPointer(const VAddr vaddr) const {
const u8* page_pointer = impl->current_page_table->pointers[vaddr >> CITRA_PAGE_BITS];
if (page_pointer) {
return page_pointer + (vaddr & CITRA_PAGE_MASK);
}
if (impl->current_page_table->attributes[vaddr >> CITRA_PAGE_BITS] ==
PageType::RasterizerCachedMemory) {
return GetPointerForRasterizerCache(vaddr);
}
LOG_ERROR(HW_Memory, "unknown GetPointer @ 0x{:08x}", vaddr);
return nullptr;
}
std::string MemorySystem::ReadCString(VAddr vaddr, std::size_t max_length) {
std::string string;
string.reserve(max_length);
for (std::size_t i = 0; i < max_length; ++i) {
char c = Read8(vaddr);
if (c == '\0') {
break;
}
string.push_back(c);
++vaddr;
}
string.shrink_to_fit();
return string;
}
u8* MemorySystem::GetPhysicalPointer(PAddr address) const {
return GetPhysicalRef(address);
}
MemoryRef MemorySystem::GetPhysicalRef(PAddr address) const {
constexpr std::array memory_areas = {
std::make_pair(VRAM_PADDR, VRAM_SIZE),
std::make_pair(DSP_RAM_PADDR, DSP_RAM_SIZE),
std::make_pair(FCRAM_PADDR, FCRAM_N3DS_SIZE),
std::make_pair(N3DS_EXTRA_RAM_PADDR, N3DS_EXTRA_RAM_SIZE),
};
const auto area = std::find_if(memory_areas.begin(), memory_areas.end(), [&](const auto& area) {
// Note: the region end check is inclusive because the user can pass in an address that
// represents an open right bound
return address >= area.first && address <= area.first + area.second;
});
if (area == memory_areas.end()) {
LOG_ERROR(HW_Memory, "Unknown GetPhysicalPointer @ {:#08X} at PC {:#08X}", address,
Core::GetRunningCore().GetPC());
return nullptr;
}
u32 offset_into_region = address - area->first;
std::shared_ptr<BackingMem> target_mem = nullptr;
switch (area->first) {
case VRAM_PADDR:
target_mem = impl->vram_mem;
break;
case DSP_RAM_PADDR:
target_mem = impl->dsp_mem;
break;
case FCRAM_PADDR:
target_mem = impl->fcram_mem;
break;
case N3DS_EXTRA_RAM_PADDR:
target_mem = impl->n3ds_extra_ram_mem;
break;
default:
UNREACHABLE();
}
if (offset_into_region > target_mem->GetSize()) {
return {nullptr};
}
return {target_mem, offset_into_region};
}
/// For a rasterizer-accessible PAddr, gets a list of all possible VAddr
static std::vector<VAddr> PhysicalToVirtualAddressForRasterizer(PAddr addr) {
if (addr >= VRAM_PADDR && addr < VRAM_PADDR_END) {
return {addr - VRAM_PADDR + VRAM_VADDR};
}
if (addr >= Service::PLGLDR::PLG_LDR::GetPluginFBAddr() &&
addr < Service::PLGLDR::PLG_LDR::GetPluginFBAddr() + PLUGIN_3GX_FB_SIZE) {
return {addr - Service::PLGLDR::PLG_LDR::GetPluginFBAddr() + PLUGIN_3GX_FB_VADDR};
}
if (addr >= FCRAM_PADDR && addr < FCRAM_PADDR_END) {
return {addr - FCRAM_PADDR + LINEAR_HEAP_VADDR, addr - FCRAM_PADDR + NEW_LINEAR_HEAP_VADDR};
}
if (addr >= FCRAM_PADDR_END && addr < FCRAM_N3DS_PADDR_END) {
return {addr - FCRAM_PADDR + NEW_LINEAR_HEAP_VADDR};
}
// While the physical <-> virtual mapping is 1:1 for the regions supported by the cache,
// some games (like Pokemon Super Mystery Dungeon) will try to use textures that go beyond
// the end address of VRAM, causing the Virtual->Physical translation to fail when flushing
// parts of the texture.
LOG_ERROR(HW_Memory,
"Trying to use invalid physical address for rasterizer: {:08X} at PC 0x{:08X}", addr,
Core::GetRunningCore().GetPC());
return {};
}
void MemorySystem::RasterizerMarkRegionCached(PAddr start, u32 size, bool cached) {
if (start == 0) {
return;
}
u32 num_pages = ((start + size - 1) >> CITRA_PAGE_BITS) - (start >> CITRA_PAGE_BITS) + 1;
PAddr paddr = start;
for (unsigned i = 0; i < num_pages; ++i, paddr += CITRA_PAGE_SIZE) {
for (VAddr vaddr : PhysicalToVirtualAddressForRasterizer(paddr)) {
impl->cache_marker.Mark(vaddr, cached);
for (auto page_table : impl->page_table_list) {
PageType& page_type = page_table->attributes[vaddr >> CITRA_PAGE_BITS];
if (cached) {
// Switch page type to cached if now cached
switch (page_type) {
case PageType::Unmapped:
// It is not necessary for a process to have this region mapped into its
// address space, for example, a system module need not have a VRAM mapping.
break;
case PageType::Memory:
page_type = PageType::RasterizerCachedMemory;
page_table->pointers[vaddr >> CITRA_PAGE_BITS] = nullptr;
break;
default:
UNREACHABLE();
}
} else {
// Switch page type to uncached if now uncached
switch (page_type) {
case PageType::Unmapped:
// It is not necessary for a process to have this region mapped into its
// address space, for example, a system module need not have a VRAM mapping.
break;
case PageType::RasterizerCachedMemory: {
page_type = PageType::Memory;
page_table->pointers[vaddr >> CITRA_PAGE_BITS] =
GetPointerForRasterizerCache(vaddr & ~CITRA_PAGE_MASK);
break;
}
default:
UNREACHABLE();
}
}
}
}
}
}
void RasterizerFlushRegion(PAddr start, u32 size) {
if (VideoCore::g_renderer == nullptr) {
return;
}
VideoCore::g_renderer->Rasterizer()->FlushRegion(start, size);
}
void RasterizerInvalidateRegion(PAddr start, u32 size) {
if (VideoCore::g_renderer == nullptr) {
return;
}
VideoCore::g_renderer->Rasterizer()->InvalidateRegion(start, size);
}
void RasterizerFlushAndInvalidateRegion(PAddr start, u32 size) {
// Since pages are unmapped on shutdown after video core is shutdown, the renderer may be
// null here
if (VideoCore::g_renderer == nullptr) {
return;
}
VideoCore::g_renderer->Rasterizer()->FlushAndInvalidateRegion(start, size);
}
void RasterizerClearAll(bool flush) {
// Since pages are unmapped on shutdown after video core is shutdown, the renderer may be
// null here
if (VideoCore::g_renderer == nullptr) {
return;
}
VideoCore::g_renderer->Rasterizer()->ClearAll(flush);
}
void RasterizerFlushVirtualRegion(VAddr start, u32 size, FlushMode mode) {
// Since pages are unmapped on shutdown after video core is shutdown, the renderer may be
// null here
if (VideoCore::g_renderer == nullptr) {
return;
}
VAddr end = start + size;
auto CheckRegion = [&](VAddr region_start, VAddr region_end, PAddr paddr_region_start) {
if (start >= region_end || end <= region_start) {
// No overlap with region
return;
}
VAddr overlap_start = std::max(start, region_start);
VAddr overlap_end = std::min(end, region_end);
PAddr physical_start = paddr_region_start + (overlap_start - region_start);
u32 overlap_size = overlap_end - overlap_start;
auto* rasterizer = VideoCore::g_renderer->Rasterizer();
switch (mode) {
case FlushMode::Flush:
rasterizer->FlushRegion(physical_start, overlap_size);
break;
case FlushMode::Invalidate:
rasterizer->InvalidateRegion(physical_start, overlap_size);
break;
case FlushMode::FlushAndInvalidate:
rasterizer->FlushAndInvalidateRegion(physical_start, overlap_size);
break;
}
};
CheckRegion(LINEAR_HEAP_VADDR, LINEAR_HEAP_VADDR_END, FCRAM_PADDR);
CheckRegion(NEW_LINEAR_HEAP_VADDR, NEW_LINEAR_HEAP_VADDR_END, FCRAM_PADDR);
CheckRegion(VRAM_VADDR, VRAM_VADDR_END, VRAM_PADDR);
if (Service::PLGLDR::PLG_LDR::GetPluginFBAddr())
CheckRegion(PLUGIN_3GX_FB_VADDR, PLUGIN_3GX_FB_VADDR_END,
Service::PLGLDR::PLG_LDR::GetPluginFBAddr());
}
u8 MemorySystem::Read8(const VAddr addr) {
return Read<u8>(addr);
}
u16 MemorySystem::Read16(const VAddr addr) {
return Read<u16_le>(addr);
}
u32 MemorySystem::Read32(const VAddr addr) {
return Read<u32_le>(addr);
}
u64 MemorySystem::Read64(const VAddr addr) {
return Read<u64_le>(addr);
}
void MemorySystem::ReadBlock(const Kernel::Process& process, const VAddr src_addr,
void* dest_buffer, const std::size_t size) {
return impl->ReadBlockImpl<false>(process, src_addr, dest_buffer, size);
}
void MemorySystem::ReadBlock(VAddr src_addr, void* dest_buffer, std::size_t size) {
const auto& process = *Core::System::GetInstance().Kernel().GetCurrentProcess();
return impl->ReadBlockImpl<false>(process, src_addr, dest_buffer, size);
}
void MemorySystem::Write8(const VAddr addr, const u8 data) {
Write<u8>(addr, data);
}
void MemorySystem::Write16(const VAddr addr, const u16 data) {
Write<u16_le>(addr, data);
}
void MemorySystem::Write32(const VAddr addr, const u32 data) {
Write<u32_le>(addr, data);
}
void MemorySystem::Write64(const VAddr addr, const u64 data) {
Write<u64_le>(addr, data);
}
bool MemorySystem::WriteExclusive8(const VAddr addr, const u8 data, const u8 expected) {
return WriteExclusive<u8>(addr, data, expected);
}
bool MemorySystem::WriteExclusive16(const VAddr addr, const u16 data, const u16 expected) {
return WriteExclusive<u16_le>(addr, data, expected);
}
bool MemorySystem::WriteExclusive32(const VAddr addr, const u32 data, const u32 expected) {
return WriteExclusive<u32_le>(addr, data, expected);
}
bool MemorySystem::WriteExclusive64(const VAddr addr, const u64 data, const u64 expected) {
return WriteExclusive<u64_le>(addr, data, expected);
}
void MemorySystem::WriteBlock(const Kernel::Process& process, const VAddr dest_addr,
const void* src_buffer, const std::size_t size) {
return impl->WriteBlockImpl<false>(process, dest_addr, src_buffer, size);
}
void MemorySystem::WriteBlock(const VAddr dest_addr, const void* src_buffer,
const std::size_t size) {
auto& process = *Core::System::GetInstance().Kernel().GetCurrentProcess();
return impl->WriteBlockImpl<false>(process, dest_addr, src_buffer, size);
}
void MemorySystem::ZeroBlock(const Kernel::Process& process, const VAddr dest_addr,
const std::size_t size) {
auto& page_table = *process.vm_manager.page_table;
std::size_t remaining_size = size;
std::size_t page_index = dest_addr >> CITRA_PAGE_BITS;
std::size_t page_offset = dest_addr & CITRA_PAGE_MASK;
static const std::array<u8, CITRA_PAGE_SIZE> zeros = {};
while (remaining_size > 0) {
const std::size_t copy_amount = std::min(CITRA_PAGE_SIZE - page_offset, remaining_size);
const VAddr current_vaddr =
static_cast<VAddr>((page_index << CITRA_PAGE_BITS) + page_offset);
switch (page_table.attributes[page_index]) {
case PageType::Unmapped: {
LOG_ERROR(HW_Memory,
"unmapped ZeroBlock @ 0x{:08X} (start address = 0x{:08X}, size = {}) at PC "
"0x{:08X}",
current_vaddr, dest_addr, size, Core::GetRunningCore().GetPC());
break;
}
case PageType::Memory: {
DEBUG_ASSERT(page_table.pointers[page_index]);
u8* dest_ptr = page_table.pointers[page_index] + page_offset;
std::memset(dest_ptr, 0, copy_amount);
break;
}
case PageType::Special: {
MMIORegionPointer handler = impl->GetMMIOHandler(page_table, current_vaddr);
DEBUG_ASSERT(handler);
handler->WriteBlock(current_vaddr, zeros.data(), copy_amount);
break;
}
case PageType::RasterizerCachedMemory: {
RasterizerFlushVirtualRegion(current_vaddr, static_cast<u32>(copy_amount),
FlushMode::Invalidate);
std::memset(GetPointerForRasterizerCache(current_vaddr), 0, copy_amount);
break;
}
default:
UNREACHABLE();
}
page_index++;
page_offset = 0;
remaining_size -= copy_amount;
}
}
void MemorySystem::CopyBlock(const Kernel::Process& process, VAddr dest_addr, VAddr src_addr,
const std::size_t size) {
CopyBlock(process, process, dest_addr, src_addr, size);
}
void MemorySystem::CopyBlock(const Kernel::Process& dest_process,
const Kernel::Process& src_process, VAddr dest_addr, VAddr src_addr,
std::size_t size) {
auto& page_table = *src_process.vm_manager.page_table;
std::size_t remaining_size = size;
std::size_t page_index = src_addr >> CITRA_PAGE_BITS;
std::size_t page_offset = src_addr & CITRA_PAGE_MASK;
while (remaining_size > 0) {
const std::size_t copy_amount = std::min(CITRA_PAGE_SIZE - page_offset, remaining_size);
const VAddr current_vaddr =
static_cast<VAddr>((page_index << CITRA_PAGE_BITS) + page_offset);
switch (page_table.attributes[page_index]) {
case PageType::Unmapped: {
LOG_ERROR(HW_Memory,
"unmapped CopyBlock @ 0x{:08X} (start address = 0x{:08X}, size = {}) at PC "
"0x{:08X}",
current_vaddr, src_addr, size, Core::GetRunningCore().GetPC());
ZeroBlock(dest_process, dest_addr, copy_amount);
break;
}
case PageType::Memory: {
DEBUG_ASSERT(page_table.pointers[page_index]);
const u8* src_ptr = page_table.pointers[page_index] + page_offset;
WriteBlock(dest_process, dest_addr, src_ptr, copy_amount);
break;
}
case PageType::Special: {
MMIORegionPointer handler = impl->GetMMIOHandler(page_table, current_vaddr);
DEBUG_ASSERT(handler);
std::vector<u8> buffer(copy_amount);
handler->ReadBlock(current_vaddr, buffer.data(), buffer.size());
WriteBlock(dest_process, dest_addr, buffer.data(), buffer.size());
break;
}
case PageType::RasterizerCachedMemory: {
RasterizerFlushVirtualRegion(current_vaddr, static_cast<u32>(copy_amount),
FlushMode::Flush);
WriteBlock(dest_process, dest_addr, GetPointerForRasterizerCache(current_vaddr),
copy_amount);
break;
}
default:
UNREACHABLE();
}
page_index++;
page_offset = 0;
dest_addr += static_cast<VAddr>(copy_amount);
src_addr += static_cast<VAddr>(copy_amount);
remaining_size -= copy_amount;
}
}
template <>
u8 ReadMMIO<u8>(MMIORegionPointer mmio_handler, VAddr addr) {
return mmio_handler->Read8(addr);
}
template <>
u16 ReadMMIO<u16>(MMIORegionPointer mmio_handler, VAddr addr) {
return mmio_handler->Read16(addr);
}
template <>
u32 ReadMMIO<u32>(MMIORegionPointer mmio_handler, VAddr addr) {
return mmio_handler->Read32(addr);
}
template <>
u64 ReadMMIO<u64>(MMIORegionPointer mmio_handler, VAddr addr) {
return mmio_handler->Read64(addr);
}
template <>
void WriteMMIO<u8>(MMIORegionPointer mmio_handler, VAddr addr, const u8 data) {
mmio_handler->Write8(addr, data);
}
template <>
void WriteMMIO<u16>(MMIORegionPointer mmio_handler, VAddr addr, const u16 data) {
mmio_handler->Write16(addr, data);
}
template <>
void WriteMMIO<u32>(MMIORegionPointer mmio_handler, VAddr addr, const u32 data) {
mmio_handler->Write32(addr, data);
}
template <>
void WriteMMIO<u64>(MMIORegionPointer mmio_handler, VAddr addr, const u64 data) {
mmio_handler->Write64(addr, data);
}
u32 MemorySystem::GetFCRAMOffset(const u8* pointer) const {
ASSERT(pointer >= impl->fcram.get() && pointer <= impl->fcram.get() + Memory::FCRAM_N3DS_SIZE);
return static_cast<u32>(pointer - impl->fcram.get());
}
u8* MemorySystem::GetFCRAMPointer(std::size_t offset) {
ASSERT(offset <= Memory::FCRAM_N3DS_SIZE);
return impl->fcram.get() + offset;
}
const u8* MemorySystem::GetFCRAMPointer(std::size_t offset) const {
ASSERT(offset <= Memory::FCRAM_N3DS_SIZE);
return impl->fcram.get() + offset;
}
MemoryRef MemorySystem::GetFCRAMRef(std::size_t offset) const {
ASSERT(offset <= Memory::FCRAM_N3DS_SIZE);
return MemoryRef(impl->fcram_mem, offset);
}
void MemorySystem::SetDSP(AudioCore::DspInterface& dsp) {
impl->dsp = &dsp;
}
} // namespace Memory
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