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Move away from PCSX2 fastmem

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wheremyfoodat 2024-11-28 23:59:16 +02:00
parent fbddb02ac3
commit ede3a93cda
10 changed files with 1058 additions and 1023 deletions
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10
CMakeLists.txt
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@ -165,7 +165,7 @@ include_directories(third_party/toml11)
include_directories(third_party/glm) include_directories(third_party/glm)
include_directories(third_party/renderdoc) include_directories(third_party/renderdoc)
include_directories(third_party/duckstation) include_directories(third_party/duckstation)
include_directories(third_party/pcsx2/include) include_directories(third_party/host_memory/include)
add_subdirectory(third_party/cmrc) add_subdirectory(third_party/cmrc)
@ -379,11 +379,11 @@ set(THIRD_PARTY_SOURCE_FILES third_party/imgui/imgui.cpp
third_party/cityhash/cityhash.cpp third_party/cityhash/cityhash.cpp
third_party/xxhash/xxhash.c third_party/xxhash/xxhash.c
)
if(WIN32) third_party/host_memory/host_memory.cpp
set(THIRD_PARTY_SOURCE_FILES ${THIRD_PARTY_SOURCE_FILES} third_party/pcsx2/WinHostSys.cpp) third_party/host_memory/virtual_buffer.cpp
endif() third_party/host_memory/dynamic_library.cpp
)
if(ENABLE_LUAJIT AND NOT ANDROID) if(ENABLE_LUAJIT AND NOT ANDROID)
# Build luv and libuv for Lua TCP server usage if we're not on Android # Build luv and libuv for Lua TCP server usage if we're not on Android

97
third_party/host_memory/dynamic_library.cpp vendored Normal file
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@ -0,0 +1,97 @@
// SPDX-FileCopyrightText: 2019 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "host_memory/dynamic_library.h"
#include <fmt/format.h>
#include <string>
#include <utility>
#ifdef _WIN32
#include <windows.h>
#else
#include <dlfcn.h>
#endif
namespace Common {
DynamicLibrary::DynamicLibrary() = default;
DynamicLibrary::DynamicLibrary(const char* filename) { void(Open(filename)); }
DynamicLibrary::DynamicLibrary(void* handle_) : handle{handle_} {}
DynamicLibrary::DynamicLibrary(DynamicLibrary&& rhs) noexcept : handle{std::exchange(rhs.handle, nullptr)} {}
DynamicLibrary& DynamicLibrary::operator=(DynamicLibrary&& rhs) noexcept {
Close();
handle = std::exchange(rhs.handle, nullptr);
return *this;
}
DynamicLibrary::~DynamicLibrary() { Close(); }
std::string DynamicLibrary::GetUnprefixedFilename(const char* filename) {
#if defined(_WIN32)
return std::string(filename) + ".dll";
#elif defined(__APPLE__)
return std::string(filename) + ".dylib";
#else
return std::string(filename) + ".so";
#endif
}
std::string DynamicLibrary::GetVersionedFilename(const char* libname, int major, int minor) {
#if defined(_WIN32)
if (major >= 0 && minor >= 0)
return fmt::format("{}-{}-{}.dll", libname, major, minor);
else if (major >= 0)
return fmt::format("{}-{}.dll", libname, major);
else
return fmt::format("{}.dll", libname);
#elif defined(__APPLE__)
const char* prefix = std::strncmp(libname, "lib", 3) ? "lib" : "";
if (major >= 0 && minor >= 0)
return fmt::format("{}{}.{}.{}.dylib", prefix, libname, major, minor);
else if (major >= 0)
return fmt::format("{}{}.{}.dylib", prefix, libname, major);
else
return fmt::format("{}{}.dylib", prefix, libname);
#else
const char* prefix = std::strncmp(libname, "lib", 3) ? "lib" : "";
if (major >= 0 && minor >= 0)
return fmt::format("{}{}.so.{}.{}", prefix, libname, major, minor);
else if (major >= 0)
return fmt::format("{}{}.so.{}", prefix, libname, major);
else
return fmt::format("{}{}.so", prefix, libname);
#endif
}
bool DynamicLibrary::Open(const char* filename) {
#ifdef _WIN32
handle = reinterpret_cast<void*>(LoadLibraryA(filename));
#else
handle = dlopen(filename, RTLD_NOW);
#endif
return handle != nullptr;
}
void DynamicLibrary::Close() {
if (!IsOpen()) return;
#ifdef _WIN32
FreeLibrary(reinterpret_cast<HMODULE>(handle));
#else
dlclose(handle);
#endif
handle = nullptr;
}
void* DynamicLibrary::GetSymbolAddress(const char* name) const {
#ifdef _WIN32
return reinterpret_cast<void*>(GetProcAddress(reinterpret_cast<HMODULE>(handle), name));
#else
return reinterpret_cast<void*>(dlsym(handle, name));
#endif
}
} // namespace Common

691
third_party/host_memory/host_memory.cpp vendored Normal file
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@ -0,0 +1,691 @@
// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#ifdef _WIN32
#include <windows.h>
#include <boost/icl/separate_interval_set.hpp>
#include <iterator>
#include <unordered_map>
#include "host_memory/dynamic_library.h"
#elif defined(__linux__) || defined(__FreeBSD__) // ^^^ Windows ^^^ vvv Linux vvv
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/random.h>
#include <unistd.h>
#include <boost/icl/interval_set.hpp>
#include "common/scope_exit.h"
#ifndef MAP_NORESERVE
#define MAP_NORESERVE 0
#endif
#endif // ^^^ Linux ^^^
#include <mutex>
#include <random>
#include <memory>
#include "align.hpp"
#include <host_memory/host_memory.h>
// #include "common/free_region_manager.h"
namespace Common {
constexpr size_t PageAlignment = 0x1000;
constexpr size_t HugePageSize = 0x200000;
#ifdef _WIN32
// Manually imported for MinGW compatibility
#ifndef MEM_RESERVE_PLACEHOLDER
#define MEM_RESERVE_PLACEHOLDER 0x00040000
#endif
#ifndef MEM_REPLACE_PLACEHOLDER
#define MEM_REPLACE_PLACEHOLDER 0x00004000
#endif
#ifndef MEM_COALESCE_PLACEHOLDERS
#define MEM_COALESCE_PLACEHOLDERS 0x00000001
#endif
#ifndef MEM_PRESERVE_PLACEHOLDER
#define MEM_PRESERVE_PLACEHOLDER 0x00000002
#endif
using PFN_CreateFileMapping2 = _Ret_maybenull_ HANDLE(WINAPI*)(
_In_ HANDLE File, _In_opt_ SECURITY_ATTRIBUTES* SecurityAttributes, _In_ ULONG DesiredAccess, _In_ ULONG PageProtection,
_In_ ULONG AllocationAttributes, _In_ ULONG64 MaximumSize, _In_opt_ PCWSTR Name,
_Inout_updates_opt_(ParameterCount) MEM_EXTENDED_PARAMETER* ExtendedParameters, _In_ ULONG ParameterCount
);
using PFN_VirtualAlloc2 = _Ret_maybenull_ PVOID(WINAPI*)(
_In_opt_ HANDLE Process, _In_opt_ PVOID BaseAddress, _In_ SIZE_T Size, _In_ ULONG AllocationType, _In_ ULONG PageProtection,
_Inout_updates_opt_(ParameterCount) MEM_EXTENDED_PARAMETER* ExtendedParameters, _In_ ULONG ParameterCount
);
using PFN_MapViewOfFile3 = _Ret_maybenull_ PVOID(WINAPI*)(
_In_ HANDLE FileMapping, _In_opt_ HANDLE Process, _In_opt_ PVOID BaseAddress, _In_ ULONG64 Offset, _In_ SIZE_T ViewSize,
_In_ ULONG AllocationType, _In_ ULONG PageProtection, _Inout_updates_opt_(ParameterCount) MEM_EXTENDED_PARAMETER* ExtendedParameters,
_In_ ULONG ParameterCount
);
using PFN_UnmapViewOfFile2 = BOOL(WINAPI*)(_In_ HANDLE Process, _In_ PVOID BaseAddress, _In_ ULONG UnmapFlags);
template <typename T>
static void GetFuncAddress(Common::DynamicLibrary& dll, const char* name, T& pfn) {
if (!dll.GetSymbol(name, &pfn)) {
LOG_CRITICAL(HW_Memory, "Failed to load {}", name);
throw std::bad_alloc{};
}
}
class HostMemory::Impl {
public:
explicit Impl(size_t backing_size_, size_t virtual_size_)
: backing_size{backing_size_}, virtual_size{virtual_size_}, process{GetCurrentProcess()}, kernelbase_dll("Kernelbase") {
if (!kernelbase_dll.IsOpen()) {
LOG_CRITICAL(HW_Memory, "Failed to load Kernelbase.dll");
throw std::bad_alloc{};
}
GetFuncAddress(kernelbase_dll, "CreateFileMapping2", pfn_CreateFileMapping2);
GetFuncAddress(kernelbase_dll, "VirtualAlloc2", pfn_VirtualAlloc2);
GetFuncAddress(kernelbase_dll, "MapViewOfFile3", pfn_MapViewOfFile3);
GetFuncAddress(kernelbase_dll, "UnmapViewOfFile2", pfn_UnmapViewOfFile2);
// Allocate backing file map
backing_handle = pfn_CreateFileMapping2(
INVALID_HANDLE_VALUE, nullptr, FILE_MAP_WRITE | FILE_MAP_READ, PAGE_READWRITE, SEC_COMMIT, backing_size, nullptr, nullptr, 0
);
if (!backing_handle) {
LOG_CRITICAL(HW_Memory, "Failed to allocate {} MiB of backing memory", backing_size >> 20);
throw std::bad_alloc{};
}
// Allocate a virtual memory for the backing file map as placeholder
backing_base =
static_cast<u8*>(pfn_VirtualAlloc2(process, nullptr, backing_size, MEM_RESERVE | MEM_RESERVE_PLACEHOLDER, PAGE_NOACCESS, nullptr, 0));
if (!backing_base) {
Release();
LOG_CRITICAL(HW_Memory, "Failed to reserve {} MiB of virtual memory", backing_size >> 20);
throw std::bad_alloc{};
}
// Map backing placeholder
void* const ret =
pfn_MapViewOfFile3(backing_handle, process, backing_base, 0, backing_size, MEM_REPLACE_PLACEHOLDER, PAGE_READWRITE, nullptr, 0);
if (ret != backing_base) {
Release();
LOG_CRITICAL(HW_Memory, "Failed to map {} MiB of virtual memory", backing_size >> 20);
throw std::bad_alloc{};
}
// Allocate virtual address placeholder
virtual_base =
static_cast<u8*>(pfn_VirtualAlloc2(process, nullptr, virtual_size, MEM_RESERVE | MEM_RESERVE_PLACEHOLDER, PAGE_NOACCESS, nullptr, 0));
if (!virtual_base) {
Release();
LOG_CRITICAL(HW_Memory, "Failed to reserve {} GiB of virtual memory", virtual_size >> 30);
throw std::bad_alloc{};
}
}
~Impl() { Release(); }
void Map(size_t virtual_offset, size_t host_offset, size_t length, MemoryPermission perms) {
std::unique_lock lock{placeholder_mutex};
if (!IsNiechePlaceholder(virtual_offset, length)) {
Split(virtual_offset, length);
}
ASSERT(placeholders.find({virtual_offset, virtual_offset + length}) == placeholders.end());
TrackPlaceholder(virtual_offset, host_offset, length);
MapView(virtual_offset, host_offset, length);
}
void Unmap(size_t virtual_offset, size_t length) {
std::scoped_lock lock{placeholder_mutex};
// Unmap until there are no more placeholders
while (UnmapOnePlaceholder(virtual_offset, length)) {
}
}
void Protect(size_t virtual_offset, size_t length, bool read, bool write, bool execute) {
DWORD new_flags{};
if (read && write) {
new_flags = PAGE_READWRITE;
} else if (read && !write) {
new_flags = PAGE_READONLY;
} else if (!read && !write) {
new_flags = PAGE_NOACCESS;
} else {
UNIMPLEMENTED_MSG("Protection flag combination read={} write={}", read, write);
}
const size_t virtual_end = virtual_offset + length;
std::scoped_lock lock{placeholder_mutex};
auto [it, end] = placeholders.equal_range({virtual_offset, virtual_end});
while (it != end) {
const size_t offset = std::max(it->lower(), virtual_offset);
const size_t protect_length = std::min(it->upper(), virtual_end) - offset;
DWORD old_flags{};
if (!VirtualProtect(virtual_base + offset, protect_length, new_flags, &old_flags)) {
LOG_CRITICAL(HW_Memory, "Failed to change virtual memory protect rules");
}
++it;
}
}
bool ClearBackingRegion(size_t physical_offset, size_t length) {
// TODO: This does not seem to be possible on Windows.
return false;
}
void EnableDirectMappedAddress() {
// TODO
UNREACHABLE();
}
const size_t backing_size; ///< Size of the backing memory in bytes
const size_t virtual_size; ///< Size of the virtual address placeholder in bytes
u8* backing_base{};
u8* virtual_base{};
private:
/// Release all resources in the object
void Release() {
if (!placeholders.empty()) {
for (const auto& placeholder : placeholders) {
if (!pfn_UnmapViewOfFile2(process, virtual_base + placeholder.lower(), MEM_PRESERVE_PLACEHOLDER)) {
LOG_CRITICAL(HW_Memory, "Failed to unmap virtual memory placeholder");
}
}
Coalesce(0, virtual_size);
}
if (virtual_base) {
if (!VirtualFree(virtual_base, 0, MEM_RELEASE)) {
LOG_CRITICAL(HW_Memory, "Failed to free virtual memory");
}
}
if (backing_base) {
if (!pfn_UnmapViewOfFile2(process, backing_base, MEM_PRESERVE_PLACEHOLDER)) {
LOG_CRITICAL(HW_Memory, "Failed to unmap backing memory placeholder");
}
if (!VirtualFreeEx(process, backing_base, 0, MEM_RELEASE)) {
LOG_CRITICAL(HW_Memory, "Failed to free backing memory");
}
}
if (!CloseHandle(backing_handle)) {
LOG_CRITICAL(HW_Memory, "Failed to free backing memory file handle");
}
}
/// Unmap one placeholder in the given range (partial unmaps are supported)
/// Return true when there are no more placeholders to unmap
bool UnmapOnePlaceholder(size_t virtual_offset, size_t length) {
const auto it = placeholders.find({virtual_offset, virtual_offset + length});
const auto begin = placeholders.begin();
const auto end = placeholders.end();
if (it == end) {
return false;
}
const size_t placeholder_begin = it->lower();
const size_t placeholder_end = it->upper();
const size_t unmap_begin = std::max(virtual_offset, placeholder_begin);
const size_t unmap_end = std::min(virtual_offset + length, placeholder_end);
ASSERT(unmap_begin >= placeholder_begin && unmap_begin < placeholder_end);
ASSERT(unmap_end <= placeholder_end && unmap_end > placeholder_begin);
const auto host_pointer_it = placeholder_host_pointers.find(placeholder_begin);
ASSERT(host_pointer_it != placeholder_host_pointers.end());
const size_t host_offset = host_pointer_it->second;
const bool split_left = unmap_begin > placeholder_begin;
const bool split_right = unmap_end < placeholder_end;
if (!pfn_UnmapViewOfFile2(process, virtual_base + placeholder_begin, MEM_PRESERVE_PLACEHOLDER)) {
LOG_CRITICAL(HW_Memory, "Failed to unmap placeholder");
}
// If we have to remap memory regions due to partial unmaps, we are in a data race as
// Windows doesn't support remapping memory without unmapping first. Avoid adding any extra
// logic within the panic region described below.
// Panic region, we are in a data race right now
if (split_left || split_right) {
Split(unmap_begin, unmap_end - unmap_begin);
}
if (split_left) {
MapView(placeholder_begin, host_offset, unmap_begin - placeholder_begin);
}
if (split_right) {
MapView(unmap_end, host_offset + unmap_end - placeholder_begin, placeholder_end - unmap_end);
}
// End panic region
size_t coalesce_begin = unmap_begin;
if (!split_left) {
// Try to coalesce pages to the left
coalesce_begin = it == begin ? 0 : std::prev(it)->upper();
if (coalesce_begin != placeholder_begin) {
Coalesce(coalesce_begin, unmap_end - coalesce_begin);
}
}
if (!split_right) {
// Try to coalesce pages to the right
const auto next = std::next(it);
const size_t next_begin = next == end ? virtual_size : next->lower();
if (placeholder_end != next_begin) {
// We can coalesce to the right
Coalesce(coalesce_begin, next_begin - coalesce_begin);
}
}
// Remove and reinsert placeholder trackers
UntrackPlaceholder(it);
if (split_left) {
TrackPlaceholder(placeholder_begin, host_offset, unmap_begin - placeholder_begin);
}
if (split_right) {
TrackPlaceholder(unmap_end, host_offset + unmap_end - placeholder_begin, placeholder_end - unmap_end);
}
return true;
}
void MapView(size_t virtual_offset, size_t host_offset, size_t length) {
if (!pfn_MapViewOfFile3(
backing_handle, process, virtual_base + virtual_offset, host_offset, length, MEM_REPLACE_PLACEHOLDER, PAGE_READWRITE, nullptr, 0
)) {
LOG_CRITICAL(HW_Memory, "Failed to map placeholder");
}
}
void Split(size_t virtual_offset, size_t length) {
if (!VirtualFreeEx(process, reinterpret_cast<LPVOID>(virtual_base + virtual_offset), length, MEM_RELEASE | MEM_PRESERVE_PLACEHOLDER)) {
LOG_CRITICAL(HW_Memory, "Failed to split placeholder");
}
}
void Coalesce(size_t virtual_offset, size_t length) {
if (!VirtualFreeEx(process, reinterpret_cast<LPVOID>(virtual_base + virtual_offset), length, MEM_RELEASE | MEM_COALESCE_PLACEHOLDERS)) {
LOG_CRITICAL(HW_Memory, "Failed to coalesce placeholders");
}
}
void TrackPlaceholder(size_t virtual_offset, size_t host_offset, size_t length) {
placeholders.insert({virtual_offset, virtual_offset + length});
placeholder_host_pointers.emplace(virtual_offset, host_offset);
}
void UntrackPlaceholder(boost::icl::separate_interval_set<size_t>::iterator it) {
placeholder_host_pointers.erase(it->lower());
placeholders.erase(it);
}
/// Return true when a given memory region is a "nieche" and the placeholders don't have to be
/// split.
bool IsNiechePlaceholder(size_t virtual_offset, size_t length) const {
const auto it = placeholders.upper_bound({virtual_offset, virtual_offset + length});
if (it != placeholders.end() && it->lower() == virtual_offset + length) {
return it == placeholders.begin() ? virtual_offset == 0 : std::prev(it)->upper() == virtual_offset;
}
return false;
}
HANDLE process{}; ///< Current process handle
HANDLE backing_handle{}; ///< File based backing memory
DynamicLibrary kernelbase_dll;
PFN_CreateFileMapping2 pfn_CreateFileMapping2{};
PFN_VirtualAlloc2 pfn_VirtualAlloc2{};
PFN_MapViewOfFile3 pfn_MapViewOfFile3{};
PFN_UnmapViewOfFile2 pfn_UnmapViewOfFile2{};
std::mutex placeholder_mutex; ///< Mutex for placeholders
boost::icl::separate_interval_set<size_t> placeholders; ///< Mapped placeholders
std::unordered_map<size_t, size_t> placeholder_host_pointers; ///< Placeholder backing offset
};
#elif defined(__linux__) || defined(__FreeBSD__) // ^^^ Windows ^^^ vvv Linux vvv
#ifdef ARCHITECTURE_arm64
static void* ChooseVirtualBase(size_t virtual_size) {
constexpr uintptr_t Map39BitSize = (1ULL << 39);
constexpr uintptr_t Map36BitSize = (1ULL << 36);
// This is not a cryptographic application, we just want something random.
std::mt19937_64 rng;
// We want to ensure we are allocating at an address aligned to the L2 block size.
// For Qualcomm devices, we must also allocate memory above 36 bits.
const size_t lower = Map36BitSize / HugePageSize;
const size_t upper = (Map39BitSize - virtual_size) / HugePageSize;
const size_t range = upper - lower;
// Try up to 64 times to allocate memory at random addresses in the range.
for (int i = 0; i < 64; i++) {
// Calculate a possible location.
uintptr_t hint_address = ((rng() % range) + lower) * HugePageSize;
// Try to map.
// Note: we may be able to take advantage of MAP_FIXED_NOREPLACE here.
void* map_pointer =
mmap(reinterpret_cast<void*>(hint_address), virtual_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE, -1, 0);
// If we successfully mapped, we're done.
if (reinterpret_cast<uintptr_t>(map_pointer) == hint_address) {
return map_pointer;
}
// Unmap if necessary, and try again.
if (map_pointer != MAP_FAILED) {
munmap(map_pointer, virtual_size);
}
}
return MAP_FAILED;
}
#else
static void* ChooseVirtualBase(size_t virtual_size) {
#if defined(__FreeBSD__)
void* virtual_base =
mmap(nullptr, virtual_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE | MAP_ALIGNED_SUPER, -1, 0);
if (virtual_base != MAP_FAILED) {
return virtual_base;
}
#endif
return mmap(nullptr, virtual_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE, -1, 0);
}
#endif
class HostMemory::Impl {
public:
explicit Impl(size_t backing_size_, size_t virtual_size_) : backing_size{backing_size_}, virtual_size{virtual_size_} {
bool good = false;
SCOPE_EXIT {
if (!good) {
Release();
}
};
long page_size = sysconf(_SC_PAGESIZE);
if (page_size != 0x1000) {
LOG_CRITICAL(HW_Memory, "page size {:#x} is incompatible with 4K paging", page_size);
throw std::bad_alloc{};
}
// Backing memory initialization
#if defined(__FreeBSD__) && __FreeBSD__ < 13
// XXX Drop after FreeBSD 12.* reaches EOL on 2024-06-30
fd = shm_open(SHM_ANON, O_RDWR, 0600);
#else
fd = memfd_create("HostMemory", 0);
#endif
if (fd < 0) {
LOG_CRITICAL(HW_Memory, "memfd_create failed: {}", strerror(errno));
throw std::bad_alloc{};
}
// Defined to extend the file with zeros
int ret = ftruncate(fd, backing_size);
if (ret != 0) {
LOG_CRITICAL(HW_Memory, "ftruncate failed with {}, are you out-of-memory?", strerror(errno));
throw std::bad_alloc{};
}
backing_base = static_cast<u8*>(mmap(nullptr, backing_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0));
if (backing_base == MAP_FAILED) {
LOG_CRITICAL(HW_Memory, "mmap failed: {}", strerror(errno));
throw std::bad_alloc{};
}
// Virtual memory initialization
virtual_base = virtual_map_base = static_cast<u8*>(ChooseVirtualBase(virtual_size));
if (virtual_base == MAP_FAILED) {
LOG_CRITICAL(HW_Memory, "mmap failed: {}", strerror(errno));
throw std::bad_alloc{};
}
#if defined(__linux__)
madvise(virtual_base, virtual_size, MADV_HUGEPAGE);
#endif
free_manager.SetAddressSpace(virtual_base, virtual_size);
good = true;
}
~Impl() { Release(); }
void Map(size_t virtual_offset, size_t host_offset, size_t length, MemoryPermission perms) {
// Intersect the range with our address space.
AdjustMap(&virtual_offset, &length);
// We are removing a placeholder.
free_manager.AllocateBlock(virtual_base + virtual_offset, length);
// Deduce mapping protection flags.
int flags = PROT_NONE;
if (True(perms & MemoryPermission::Read)) {
flags |= PROT_READ;
}
if (True(perms & MemoryPermission::Write)) {
flags |= PROT_WRITE;
}
#ifdef ARCHITECTURE_arm64
if (True(perms & MemoryPermission::Execute)) {
flags |= PROT_EXEC;
}
#endif
void* ret = mmap(virtual_base + virtual_offset, length, flags, MAP_SHARED | MAP_FIXED, fd, host_offset);
ASSERT_MSG(ret != MAP_FAILED, "mmap failed: {}", strerror(errno));
}
void Unmap(size_t virtual_offset, size_t length) {
// The method name is wrong. We're still talking about the virtual range.
// We don't want to unmap, we want to reserve this memory.
// Intersect the range with our address space.
AdjustMap(&virtual_offset, &length);
// Merge with any adjacent placeholder mappings.
auto [merged_pointer, merged_size] = free_manager.FreeBlock(virtual_base + virtual_offset, length);
void* ret = mmap(merged_pointer, merged_size, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
ASSERT_MSG(ret != MAP_FAILED, "mmap failed: {}", strerror(errno));
}
void Protect(size_t virtual_offset, size_t length, bool read, bool write, bool execute) {
// Intersect the range with our address space.
AdjustMap(&virtual_offset, &length);
int flags = PROT_NONE;
if (read) {
flags |= PROT_READ;
}
if (write) {
flags |= PROT_WRITE;
}
#ifdef HAS_NCE
if (execute) {
flags |= PROT_EXEC;
}
#endif
int ret = mprotect(virtual_base + virtual_offset, length, flags);
ASSERT_MSG(ret == 0, "mprotect failed: {}", strerror(errno));
}
bool ClearBackingRegion(size_t physical_offset, size_t length) {
#ifdef __linux__
// Set MADV_REMOVE on backing map to destroy it instantly.
// This also deletes the area from the backing file.
int ret = madvise(backing_base + physical_offset, length, MADV_REMOVE);
ASSERT_MSG(ret == 0, "madvise failed: {}", strerror(errno));
return true;
#else
return false;
#endif
}
void EnableDirectMappedAddress() { virtual_base = nullptr; }
const size_t backing_size; ///< Size of the backing memory in bytes
const size_t virtual_size; ///< Size of the virtual address placeholder in bytes
u8* backing_base{reinterpret_cast<u8*>(MAP_FAILED)};
u8* virtual_base{reinterpret_cast<u8*>(MAP_FAILED)};
u8* virtual_map_base{reinterpret_cast<u8*>(MAP_FAILED)};
private:
/// Release all resources in the object
void Release() {
if (virtual_map_base != MAP_FAILED) {
int ret = munmap(virtual_map_base, virtual_size);
ASSERT_MSG(ret == 0, "munmap failed: {}", strerror(errno));
}
if (backing_base != MAP_FAILED) {
int ret = munmap(backing_base, backing_size);
ASSERT_MSG(ret == 0, "munmap failed: {}", strerror(errno));
}
if (fd != -1) {
int ret = close(fd);
ASSERT_MSG(ret == 0, "close failed: {}", strerror(errno));
}
}
void AdjustMap(size_t* virtual_offset, size_t* length) {
if (virtual_base != nullptr) {
return;
}
// If we are direct mapped, we want to make sure we are operating on a region
// that is in range of our virtual mapping.
size_t intended_start = *virtual_offset;
size_t intended_end = intended_start + *length;
size_t address_space_start = reinterpret_cast<size_t>(virtual_map_base);
size_t address_space_end = address_space_start + virtual_size;
if (address_space_start > intended_end || intended_start > address_space_end) {
*virtual_offset = 0;
*length = 0;
} else {
*virtual_offset = std::max(intended_start, address_space_start);
*length = std::min(intended_end, address_space_end) - *virtual_offset;
}
}
int fd{-1}; // memfd file descriptor, -1 is the error value of memfd_create
FreeRegionManager free_manager{};
};
#else // ^^^ Linux ^^^ vvv Generic vvv
class HostMemory::Impl {
public:
explicit Impl(size_t /*backing_size */, size_t /* virtual_size */) {
// This is just a place holder.
// Please implement fastmem in a proper way on your platform.
throw std::bad_alloc{};
}
void Map(size_t virtual_offset, size_t host_offset, size_t length, MemoryPermission perm) {}
void Unmap(size_t virtual_offset, size_t length) {}
void Protect(size_t virtual_offset, size_t length, bool read, bool write, bool execute) {}
bool ClearBackingRegion(size_t physical_offset, size_t length) { return false; }
void EnableDirectMappedAddress() {}
u8* backing_base{nullptr};
u8* virtual_base{nullptr};
};
#endif // ^^^ Generic ^^^
HostMemory::HostMemory(size_t backing_size_, size_t virtual_size_) : backing_size(backing_size_), virtual_size(virtual_size_) {
try {
// Try to allocate a fastmem arena.
// The implementation will fail with std::bad_alloc on errors.
impl = std::make_unique<HostMemory::Impl>(Common::alignUp(backing_size, PageAlignment), Common::alignUp(virtual_size, PageAlignment) + HugePageSize);
backing_base = impl->backing_base;
virtual_base = impl->virtual_base;
if (virtual_base) {
// Ensure the virtual base is aligned to the L2 block size.
virtual_base = reinterpret_cast<u8*>(Common::alignUp(reinterpret_cast<uintptr_t>(virtual_base), HugePageSize));
virtual_base_offset = virtual_base - impl->virtual_base;
}
} catch (const std::bad_alloc&) {
Helpers::warn("Fastmem unavailable, falling back to VirtualBuffer for memory allocation");
fallback_buffer = std::make_unique<Common::VirtualBuffer<u8>>(backing_size);
backing_base = fallback_buffer->data();
virtual_base = nullptr;
}
}
HostMemory::~HostMemory() = default;
HostMemory::HostMemory(HostMemory&&) noexcept = default;
HostMemory& HostMemory::operator=(HostMemory&&) noexcept = default;
void HostMemory::Map(size_t virtual_offset, size_t host_offset, size_t length, MemoryPermission perms, bool separate_heap) {
ASSERT(virtual_offset % PageAlignment == 0);
ASSERT(host_offset % PageAlignment == 0);
ASSERT(length % PageAlignment == 0);
ASSERT(virtual_offset + length <= virtual_size);
ASSERT(host_offset + length <= backing_size);
if (length == 0 || !virtual_base || !impl) {
return;
}
impl->Map(virtual_offset + virtual_base_offset, host_offset, length, perms);
}
void HostMemory::Unmap(size_t virtual_offset, size_t length, bool separate_heap) {
ASSERT(virtual_offset % PageAlignment == 0);
ASSERT(length % PageAlignment == 0);
ASSERT(virtual_offset + length <= virtual_size);
if (length == 0 || !virtual_base || !impl) {
return;
}
impl->Unmap(virtual_offset + virtual_base_offset, length);
}
void HostMemory::Protect(size_t virtual_offset, size_t length, MemoryPermission perm) {
ASSERT(virtual_offset % PageAlignment == 0);
ASSERT(length % PageAlignment == 0);
ASSERT(virtual_offset + length <= virtual_size);
if (length == 0 || !virtual_base || !impl) {
return;
}
const bool read = True(perm & MemoryPermission::Read);
const bool write = True(perm & MemoryPermission::Write);
const bool execute = True(perm & MemoryPermission::Execute);
impl->Protect(virtual_offset + virtual_base_offset, length, read, write, execute);
}
void HostMemory::ClearBackingRegion(size_t physical_offset, size_t length, u32 fill_value) {
if (!impl || fill_value != 0 || !impl->ClearBackingRegion(physical_offset, length)) {
std::memset(backing_base + physical_offset, fill_value, length);
}
}
void HostMemory::EnableDirectMappedAddress() {
if (impl) {
impl->EnableDirectMappedAddress();
virtual_size += reinterpret_cast<uintptr_t>(virtual_base);
}
}
} // namespace Common

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// SPDX-FileCopyrightText: 2019 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <string>
namespace Common {
/**
* Provides a platform-independent interface for loading a dynamic library and retrieving symbols.
* The interface maintains an internal reference count to allow one handle to be shared between
* multiple users.
*/
class DynamicLibrary final {
public:
/// Default constructor, does not load a library.
explicit DynamicLibrary();
/// Automatically loads the specified library. Call IsOpen() to check validity before use.
explicit DynamicLibrary(const char* filename);
/// Initializes the dynamic library with an already opened handle.
explicit DynamicLibrary(void* handle_);
/// Moves the library.
DynamicLibrary(DynamicLibrary&&) noexcept;
DynamicLibrary& operator=(DynamicLibrary&&) noexcept;
/// Delete copies, we can't copy a dynamic library.
DynamicLibrary(const DynamicLibrary&) = delete;
DynamicLibrary& operator=(const DynamicLibrary&) = delete;
/// Closes the library.
~DynamicLibrary();
/// Returns the specified library name with the platform-specific suffix added.
[[nodiscard]] static std::string GetUnprefixedFilename(const char* filename);
/// Returns the specified library name in platform-specific format.
/// Major/minor versions will not be included if set to -1.
/// If libname already contains the "lib" prefix, it will not be added again.
/// Windows: LIBNAME-MAJOR-MINOR.dll
/// Linux: libLIBNAME.so.MAJOR.MINOR
/// Mac: libLIBNAME.MAJOR.MINOR.dylib
[[nodiscard]] static std::string GetVersionedFilename(const char* libname, int major = -1, int minor = -1);
/// Returns true if a module is loaded, otherwise false.
[[nodiscard]] bool IsOpen() const { return handle != nullptr; }
/// Loads (or replaces) the handle with the specified library file name.
/// Returns true if the library was loaded and can be used.
[[nodiscard]] bool Open(const char* filename);
/// Unloads the library, any function pointers from this library are no longer valid.
void Close();
/// Returns the address of the specified symbol (function or variable) as an untyped pointer.
/// If the specified symbol does not exist in this library, nullptr is returned.
[[nodiscard]] void* GetSymbolAddress(const char* name) const;
/// Obtains the address of the specified symbol, automatically casting to the correct type.
/// Returns true if the symbol was found and assigned, otherwise false.
template <typename T>
[[nodiscard]] bool GetSymbol(const char* name, T* ptr) const {
*ptr = reinterpret_cast<T>(GetSymbolAddress(name));
return *ptr != nullptr;
}
private:
/// Platform-dependent data type representing a dynamic library handle.
void* handle = nullptr;
};
} // namespace Common

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// SPDX-FileCopyrightText: Copyright 2019 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <memory>
#include "common/common_funcs.h"
#include "host_memory/virtual_buffer.h"
#include "helpers.hpp"
namespace Common {
enum class MemoryPermission : u32 {
Read = 1 << 0,
Write = 1 << 1,
ReadWrite = Read | Write,
Execute = 1 << 2,
};
DECLARE_ENUM_FLAG_OPERATORS(MemoryPermission)
/**
* A low level linear memory buffer, which supports multiple mappings
* Its purpose is to rebuild a given sparse memory layout, including mirrors.
*/
class HostMemory {
public:
explicit HostMemory(size_t backing_size_, size_t virtual_size_);
~HostMemory();
/**
* Copy constructors. They shall return a copy of the buffer without the mappings.
* TODO: Implement them with COW if needed.
*/
HostMemory(const HostMemory& other) = delete;
HostMemory& operator=(const HostMemory& other) = delete;
/**
* Move constructors. They will move the buffer and the mappings to the new object.
*/
HostMemory(HostMemory&& other) noexcept;
HostMemory& operator=(HostMemory&& other) noexcept;
void Map(size_t virtual_offset, size_t host_offset, size_t length, MemoryPermission perms, bool separate_heap);
void Unmap(size_t virtual_offset, size_t length, bool separate_heap);
void Protect(size_t virtual_offset, size_t length, MemoryPermission perms);
void EnableDirectMappedAddress();
void ClearBackingRegion(size_t physical_offset, size_t length, u32 fill_value);
[[nodiscard]] u8* BackingBasePointer() noexcept { return backing_base; }
[[nodiscard]] const u8* BackingBasePointer() const noexcept { return backing_base; }
[[nodiscard]] u8* VirtualBasePointer() noexcept { return virtual_base; }
[[nodiscard]] const u8* VirtualBasePointer() const noexcept { return virtual_base; }
bool IsInVirtualRange(void* address) const noexcept { return address >= virtual_base && address < virtual_base + virtual_size; }
private:
size_t backing_size{};
size_t virtual_size{};
// Low level handler for the platform dependent memory routines
class Impl;
std::unique_ptr<Impl> impl;
u8* backing_base{};
u8* virtual_base{};
size_t virtual_base_offset{};
// Fallback if fastmem is not supported on this platform
std::unique_ptr<Common::VirtualBuffer<u8>> fallback_buffer;
};
} // namespace Common

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// SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include "helpers.hpp"
#include <utility>
namespace Common {
void* AllocateMemoryPages(std::size_t size) noexcept;
void FreeMemoryPages(void* base, std::size_t size) noexcept;
template <typename T>
class VirtualBuffer final {
public:
// TODO: Uncomment this and change Common::PageTable::PageInfo to be trivially constructible
// using std::atomic_ref once libc++ has support for it
// static_assert(
// std::is_trivially_constructible_v<T>,
// "T must be trivially constructible, as non-trivial constructors will not be executed "
// "with the current allocator");
constexpr VirtualBuffer() = default;
explicit VirtualBuffer(std::size_t count) : alloc_size{count * sizeof(T)} {
base_ptr = reinterpret_cast<T*>(AllocateMemoryPages(alloc_size));
}
~VirtualBuffer() noexcept { FreeMemoryPages(base_ptr, alloc_size); }
VirtualBuffer(const VirtualBuffer&) = delete;
VirtualBuffer& operator=(const VirtualBuffer&) = delete;
VirtualBuffer(VirtualBuffer&& other) noexcept
: alloc_size{std::exchange(other.alloc_size, 0)}, base_ptr{std::exchange(other.base_ptr), nullptr} {}
VirtualBuffer& operator=(VirtualBuffer&& other) noexcept {
alloc_size = std::exchange(other.alloc_size, 0);
base_ptr = std::exchange(other.base_ptr, nullptr);
return *this;
}
void resize(std::size_t count) {
const auto new_size = count * sizeof(T);
if (new_size == alloc_size) {
return;
}
FreeMemoryPages(base_ptr, alloc_size);
alloc_size = new_size;
base_ptr = reinterpret_cast<T*>(AllocateMemoryPages(alloc_size));
}
[[nodiscard]] constexpr const T& operator[](std::size_t index) const { return base_ptr[index]; }
[[nodiscard]] constexpr T& operator[](std::size_t index) { return base_ptr[index]; }
[[nodiscard]] constexpr T* data() { return base_ptr; }
[[nodiscard]] constexpr const T* data() const { return base_ptr; }
[[nodiscard]] constexpr std::size_t size() const { return alloc_size / sizeof(T); }
private:
std::size_t alloc_size{};
T* base_ptr{};
};
} // namespace Common

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// SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#ifdef _WIN32
#include <windows.h>
#else
#include <sys/mman.h>
#endif
#include "host_memory/virtual_buffer.h"
namespace Common {
void* AllocateMemoryPages(std::size_t size) noexcept {
#ifdef _WIN32
void* base{VirtualAlloc(nullptr, size, MEM_COMMIT, PAGE_READWRITE)};
#else
void* base{mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0)};
if (base == MAP_FAILED) {
base = nullptr;
}
#endif
if (!base) {
Helpers::panic("Failed to allocate memory pages");
}
return base;
}
void FreeMemoryPages(void* base, [[maybe_unused]] std::size_t size) noexcept {
if (!base) {
return;
}
#ifdef _WIN32
if (!VirtualFree(base, 0, MEM_RELEASE)) {
Helpers::panic("Failed to free memory pages");
}
#else
if (munmap(base, size) != 0) {
Helpers::panic("Failed to free memory pages");
}
#endif
}
} // namespace Common

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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
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The licenses for most software and other practical works are designed
to take away your freedom to share and change the works. By contrast,
the GNU General Public License is intended to guarantee your freedom to
share and change all versions of a program--to make sure it remains free
software for all its users. We, the Free Software Foundation, use the
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your programs, too.
When we speak of free software, we are referring to freedom, not
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To protect your rights, we need to prevent others from denying you
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235
third_party/pcsx2/WinHostSys.cpp vendored
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@ -1,235 +0,0 @@
// SPDX-FileCopyrightText: 2002-2024 PCSX2 Dev Team
// SPDX-License-Identifier: GPL-3.0+
#include <pcsx2/HostSys.h>
#include <mutex>
#include "align.hpp"
#include "fmt/core.h"
#include "fmt/format.h"
#include "helpers.hpp"
static DWORD ConvertToWinApi(const PageProtectionMode& mode) {
DWORD winmode = PAGE_NOACCESS;
// Windows has some really bizarre memory protection enumeration that uses bitwise
// numbering (like flags) but is in fact not a flag value. *Someone* from the early
// microsoft days wasn't a very good coder, me thinks. --air
if (mode.CanExecute()) {
winmode = mode.CanWrite() ? PAGE_EXECUTE_READWRITE : PAGE_EXECUTE_READ;
} else if (mode.CanRead()) {
winmode = mode.CanWrite() ? PAGE_READWRITE : PAGE_READONLY;
}
return winmode;
}
void* HostSys::Mmap(void* base, size_t size, const PageProtectionMode& mode) {
if (mode.IsNone()) return nullptr;
return VirtualAlloc(base, size, MEM_RESERVE | MEM_COMMIT, ConvertToWinApi(mode));
}
void HostSys::Munmap(void* base, size_t size) {
if (!base) return;
VirtualFree((void*)base, 0, MEM_RELEASE);
}
void HostSys::MemProtect(void* baseaddr, size_t size, const PageProtectionMode& mode) {
pxAssert((size & (__pagesize - 1)) == 0);
DWORD OldProtect; // enjoy my uselessness, yo!
if (!VirtualProtect(baseaddr, size, ConvertToWinApi(mode), &OldProtect)) pxFail("VirtualProtect() failed");
}
std::string HostSys::GetFileMappingName(const char* prefix) {
const unsigned pid = GetCurrentProcessId();
return fmt::format("{}_{}", prefix, pid);
}
void* HostSys::CreateSharedMemory(const char* name, size_t size) {
return static_cast<void*>(CreateFileMappingW(
INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, static_cast<DWORD>(size >> 32), static_cast<DWORD>(size),
StringUtil::UTF8StringToWideString(name).c_str()
));
}
void HostSys::DestroySharedMemory(void* ptr) { CloseHandle(static_cast<HANDLE>(ptr)); }
void* HostSys::MapSharedMemory(void* handle, size_t offset, void* baseaddr, size_t size, const PageProtectionMode& mode) {
void* ret = MapViewOfFileEx(
static_cast<HANDLE>(handle), FILE_MAP_READ | FILE_MAP_WRITE, static_cast<DWORD>(offset >> 32), static_cast<DWORD>(offset), size, baseaddr
);
if (!ret) return nullptr;
const DWORD prot = ConvertToWinApi(mode);
if (prot != PAGE_READWRITE) {
DWORD old_prot;
if (!VirtualProtect(ret, size, prot, &old_prot)) pxFail("Failed to protect memory mapping");
}
return ret;
}
void HostSys::UnmapSharedMemory(void* baseaddr, size_t size) {
if (!UnmapViewOfFile(baseaddr)) pxFail("Failed to unmap shared memory");
}
size_t HostSys::GetRuntimePageSize() {
SYSTEM_INFO si = {};
GetSystemInfo(&si);
return si.dwPageSize;
}
SharedMemoryMappingArea::SharedMemoryMappingArea(u8* base_ptr, size_t size, size_t num_pages)
: m_base_ptr(base_ptr), m_size(size), m_num_pages(num_pages) {
m_placeholder_ranges.emplace(0, size);
}
SharedMemoryMappingArea::~SharedMemoryMappingArea() {
pxAssertRel(m_num_mappings == 0, "No mappings left");
// hopefully this will be okay, and we don't need to coalesce all the placeholders...
if (!VirtualFreeEx(GetCurrentProcess(), m_base_ptr, 0, MEM_RELEASE)) pxFailRel("Failed to release shared memory area");
}
SharedMemoryMappingArea::PlaceholderMap::iterator SharedMemoryMappingArea::FindPlaceholder(size_t offset) {
if (m_placeholder_ranges.empty()) return m_placeholder_ranges.end();
// this will give us an iterator equal or after page
auto it = m_placeholder_ranges.lower_bound(offset);
if (it == m_placeholder_ranges.end()) {
// check the last page
it = (++m_placeholder_ranges.rbegin()).base();
}
// it's the one we found?
if (offset >= it->first && offset < it->second) return it;
// otherwise try the one before
if (it == m_placeholder_ranges.begin()) return m_placeholder_ranges.end();
--it;
if (offset >= it->first && offset < it->second)
return it;
else
return m_placeholder_ranges.end();
}
std::unique_ptr<SharedMemoryMappingArea> SharedMemoryMappingArea::Create(size_t size) {
pxAssertRel(Common::IsAlignedPow2(size, __pagesize), "Size is page aligned");
void* alloc = VirtualAlloc2(GetCurrentProcess(), nullptr, size, MEM_RESERVE | MEM_RESERVE_PLACEHOLDER, PAGE_NOACCESS, nullptr, 0);
if (!alloc) return nullptr;
return std::unique_ptr<SharedMemoryMappingArea>(new SharedMemoryMappingArea(static_cast<u8*>(alloc), size, size / __pagesize));
}
u8* SharedMemoryMappingArea::Map(void* file_handle, size_t file_offset, void* map_base, size_t map_size, const PageProtectionMode& mode) {
pxAssert(static_cast<u8*>(map_base) >= m_base_ptr && static_cast<u8*>(map_base) < (m_base_ptr + m_size));
const size_t map_offset = static_cast<u8*>(map_base) - m_base_ptr;
pxAssert(Common::IsAlignedPow2(map_offset, __pagesize));
pxAssert(Common::IsAlignedPow2(map_size, __pagesize));
// should be a placeholder. unless there's some other mapping we didn't free.
PlaceholderMap::iterator phit = FindPlaceholder(map_offset);
pxAssertMsg(phit != m_placeholder_ranges.end(), "Page we're mapping is a placeholder");
pxAssertMsg(map_offset >= phit->first && map_offset < phit->second, "Page is in returned placeholder range");
pxAssertMsg((map_offset + map_size) <= phit->second, "Page range is in returned placeholder range");
// do we need to split to the left? (i.e. is there a placeholder before this range)
const size_t old_ph_end = phit->second;
if (map_offset != phit->first) {
phit->second = map_offset;
// split it (i.e. left..start and start..end are now separated)
if (!VirtualFreeEx(GetCurrentProcess(), OffsetPointer(phit->first), (map_offset - phit->first), MEM_RELEASE | MEM_PRESERVE_PLACEHOLDER)) {
pxFailRel("Failed to left split placeholder for map");
}
} else {
// start of the placeholder is getting used, we'll split it right below if there's anything left over
m_placeholder_ranges.erase(phit);
}
// do we need to split to the right? (i.e. is there a placeholder after this range)
if ((map_offset + map_size) != old_ph_end) {
// split out end..ph_end
m_placeholder_ranges.emplace(map_offset + map_size, old_ph_end);
if (!VirtualFreeEx(GetCurrentProcess(), OffsetPointer(map_offset), map_size, MEM_RELEASE | MEM_PRESERVE_PLACEHOLDER)) {
pxFailRel("Failed to right split placeholder for map");
}
}
// actually do the mapping, replacing the placeholder on the range
if (!MapViewOfFile3(
static_cast<HANDLE>(file_handle), GetCurrentProcess(), map_base, file_offset, map_size, MEM_REPLACE_PLACEHOLDER, PAGE_READWRITE, nullptr,
0
)) {
Console.Error("(SharedMemoryMappingArea) MapViewOfFile3() failed: %u", GetLastError());
return nullptr;
}
const DWORD prot = ConvertToWinApi(mode);
if (prot != PAGE_READWRITE) {
DWORD old_prot;
if (!VirtualProtect(map_base, map_size, prot, &old_prot)) pxFail("Failed to protect memory mapping");
}
m_num_mappings++;
return static_cast<u8*>(map_base);
}
bool SharedMemoryMappingArea::Unmap(void* map_base, size_t map_size) {
pxAssert(static_cast<u8*>(map_base) >= m_base_ptr && static_cast<u8*>(map_base) < (m_base_ptr + m_size));
const size_t map_offset = static_cast<u8*>(map_base) - m_base_ptr;
pxAssert(Common::IsAlignedPow2(map_offset, __pagesize));
pxAssert(Common::IsAlignedPow2(map_size, __pagesize));
// unmap the specified range
if (!UnmapViewOfFile2(GetCurrentProcess(), map_base, MEM_PRESERVE_PLACEHOLDER)) {
Console.Error("(SharedMemoryMappingArea) UnmapViewOfFile2() failed: %u", GetLastError());
return false;
}
// can we coalesce to the left?
PlaceholderMap::iterator left_it = (map_offset > 0) ? FindPlaceholder(map_offset - 1) : m_placeholder_ranges.end();
if (left_it != m_placeholder_ranges.end()) {
// the left placeholder should end at our start
pxAssert(map_offset == left_it->second);
left_it->second = map_offset + map_size;
// combine placeholders before and the range we're unmapping, i.e. to the left
if (!VirtualFreeEx(
GetCurrentProcess(), OffsetPointer(left_it->first), left_it->second - left_it->first, MEM_RELEASE | MEM_COALESCE_PLACEHOLDERS
)) {
pxFail("Failed to coalesce placeholders left for unmap");
}
} else {
// this is a new placeholder
left_it = m_placeholder_ranges.emplace(map_offset, map_offset + map_size).first;
}
// can we coalesce to the right?
PlaceholderMap::iterator right_it = ((map_offset + map_size) < m_size) ? FindPlaceholder(map_offset + map_size) : m_placeholder_ranges.end();
if (right_it != m_placeholder_ranges.end()) {
// should start at our end
pxAssert(right_it->first == (map_offset + map_size));
left_it->second = right_it->second;
m_placeholder_ranges.erase(right_it);
// combine our placeholder and the next, i.e. to the right
if (!VirtualFreeEx(
GetCurrentProcess(), OffsetPointer(left_it->first), left_it->second - left_it->first, MEM_RELEASE | MEM_COALESCE_PLACEHOLDERS
)) {
pxFail("Failed to coalescae placeholders right for unmap");
}
}
m_num_mappings--;
return true;
}

109
third_party/pcsx2/include/pcsx2/HostSys.h vendored
View file

@ -1,109 +0,0 @@
// SPDX-FileCopyrightText: 2002-2024 PCSX2 Dev Team
// SPDX-License-Identifier: GPL-3.0+
#pragma once
#include <atomic>
#include <map>
#include <memory>
#include <string>
#include "helpers.hpp"
class PageProtectionMode {
protected:
bool m_read = false;
bool m_write = false;
bool m_exec = false;
public:
constexpr PageProtectionMode() = default;
constexpr PageProtectionMode& Read(bool allow = true) {
m_read = allow;
return *this;
}
constexpr PageProtectionMode& Write(bool allow = true) {
m_write = allow;
return *this;
}
constexpr PageProtectionMode& Execute(bool allow = true) {
m_exec = allow;
return *this;
}
constexpr PageProtectionMode& All(bool allow = true) {
m_read = m_write = m_exec = allow;
return *this;
}
constexpr bool CanRead() const { return m_read; }
constexpr bool CanWrite() const { return m_write; }
constexpr bool CanExecute() const { return m_exec && m_read; }
constexpr bool IsNone() const { return !m_read && !m_write; }
};
static PageProtectionMode PageAccess_None() { return PageProtectionMode(); }
static PageProtectionMode PageAccess_ReadOnly() { return PageProtectionMode().Read(); }
static PageProtectionMode PageAccess_WriteOnly() { return PageProtectionMode().Write(); }
static PageProtectionMode PageAccess_ReadWrite() { return PageAccess_ReadOnly().Write(); }
static PageProtectionMode PageAccess_ExecOnly() { return PageAccess_ReadOnly().Execute(); }
static PageProtectionMode PageAccess_Any() { return PageProtectionMode().All(); }
// --------------------------------------------------------------------------------------
// HostSys
// --------------------------------------------------------------------------------------
namespace HostSys {
// Maps a block of memory for use as a recompiled code buffer.
// Returns NULL on allocation failure.
extern void* Mmap(void* base, size_t size, const PageProtectionMode& mode);
// Unmaps a block allocated by SysMmap
extern void Munmap(void* base, size_t size);
extern void MemProtect(void* baseaddr, size_t size, const PageProtectionMode& mode);
extern std::string GetFileMappingName(const char* prefix);
extern void* CreateSharedMemory(const char* name, size_t size);
extern void DestroySharedMemory(void* ptr);
extern void* MapSharedMemory(void* handle, size_t offset, void* baseaddr, size_t size, const PageProtectionMode& mode);
extern void UnmapSharedMemory(void* baseaddr, size_t size);
/// Returns the size of pages for the current host.
size_t GetRuntimePageSize();
} // namespace HostSys
class SharedMemoryMappingArea {
public:
static std::unique_ptr<SharedMemoryMappingArea> Create(size_t size);
~SharedMemoryMappingArea();
size_t GetSize() const { return m_size; }
size_t GetNumPages() const { return m_num_pages; }
u8* BasePointer() const { return m_base_ptr; }
u8* OffsetPointer(size_t offset) const { return m_base_ptr + offset; }
u8* PagePointer(size_t page) const { return m_base_ptr + __pagesize * page; }
u8* Map(void* file_handle, size_t file_offset, void* map_base, size_t map_size, const PageProtectionMode& mode);
bool Unmap(void* map_base, size_t map_size);
private:
SharedMemoryMappingArea(u8* base_ptr, size_t size, size_t num_pages);
u8* m_base_ptr;
size_t m_size;
size_t m_num_pages;
size_t m_num_mappings = 0;
#ifdef _WIN32
using PlaceholderMap = std::map<size_t, size_t>;
PlaceholderMap::iterator FindPlaceholder(size_t page);
PlaceholderMap m_placeholder_ranges;
#endif
};