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// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <array>
#include <atomic>
#include <bit>
#include <deque>
#include <memory>
#include <mutex>
#include "common/common_types.h"
#include "common/range_mutex.h"
#include "common/scratch_buffer.h"
#include "common/virtual_buffer.h"
namespace Core {
constexpr size_t DEVICE_PAGEBITS = 12ULL;
constexpr size_t DEVICE_PAGESIZE = 1ULL << DEVICE_PAGEBITS;
constexpr size_t DEVICE_PAGEMASK = DEVICE_PAGESIZE - 1ULL;
class DeviceMemory;
namespace Memory {
class Memory;
}
template <typename DTraits>
struct DeviceMemoryManagerAllocator;
struct Asid {
size_t id;
};
template <typename Traits>
class DeviceMemoryManager {
using DeviceInterface = typename Traits::DeviceInterface;
using DeviceMethods = typename Traits::DeviceMethods;
public:
DeviceMemoryManager(const DeviceMemory& device_memory);
~DeviceMemoryManager();
void BindInterface(DeviceInterface* device_inter);
DAddr Allocate(size_t size);
void AllocateFixed(DAddr start, size_t size);
void Free(DAddr start, size_t size);
void Map(DAddr address, VAddr virtual_address, size_t size, Asid asid, bool track = false);
void Unmap(DAddr address, size_t size);
void TrackContinuityImpl(DAddr address, VAddr virtual_address, size_t size, Asid asid);
void TrackContinuity(DAddr address, VAddr virtual_address, size_t size, Asid asid) {
std::scoped_lock lk(mapping_guard);
TrackContinuityImpl(address, virtual_address, size, asid);
}
// Write / Read
template <typename T>
T* GetPointer(DAddr address);
template <typename T>
const T* GetPointer(DAddr address) const;
template <typename Func>
void ApplyOpOnPAddr(PAddr address, Common::ScratchBuffer<u32>& buffer, Func&& operation) {
DAddr subbits = static_cast<DAddr>(address & page_mask);
const u32 base = compressed_device_addr[(address >> page_bits)];
if ((base >> MULTI_FLAG_BITS) == 0) [[likely]] {
const DAddr d_address = (static_cast<DAddr>(base) << page_bits) + subbits;
operation(d_address);
return;
}
InnerGatherDeviceAddresses(buffer, address);
for (u32 value : buffer) {
operation((static_cast<DAddr>(value) << page_bits) + subbits);
}
}
template <typename Func>
void ApplyOpOnPointer(const u8* p, Common::ScratchBuffer<u32>& buffer, Func&& operation) {
PAddr address = GetRawPhysicalAddr<u8>(p);
ApplyOpOnPAddr(address, buffer, operation);
}
PAddr GetPhysicalRawAddressFromDAddr(DAddr address) const {
PAddr subbits = static_cast<PAddr>(address & page_mask);
auto paddr = compressed_physical_ptr[(address >> page_bits)];
if (paddr == 0) {
return 0;
}
return (static_cast<PAddr>(paddr - 1) << page_bits) + subbits;
}
template <typename T>
void Write(DAddr address, T value);
template <typename T>
T Read(DAddr address) const;
u8* GetSpan(const DAddr src_addr, const std::size_t size);
const u8* GetSpan(const DAddr src_addr, const std::size_t size) const;
void ReadBlock(DAddr address, void* dest_pointer, size_t size);
void ReadBlockUnsafe(DAddr address, void* dest_pointer, size_t size);
void WriteBlock(DAddr address, const void* src_pointer, size_t size);
void WriteBlockUnsafe(DAddr address, const void* src_pointer, size_t size);
Asid RegisterProcess(Memory::Memory* memory);
void UnregisterProcess(Asid id);
void UpdatePagesCachedCount(DAddr addr, size_t size, s32 delta);
static constexpr size_t AS_BITS = Traits::device_virtual_bits;
private:
static constexpr size_t device_virtual_bits = Traits::device_virtual_bits;
static constexpr size_t device_as_size = 1ULL << device_virtual_bits;
static constexpr size_t physical_min_bits = 32;
static constexpr size_t physical_max_bits = 33;
static constexpr size_t page_bits = 12;
static constexpr size_t page_size = 1ULL << page_bits;
static constexpr size_t page_mask = page_size - 1ULL;
static constexpr u32 physical_address_base = 1U << page_bits;
static constexpr u32 MULTI_FLAG_BITS = 31;
static constexpr u32 MULTI_FLAG = 1U << MULTI_FLAG_BITS;
static constexpr u32 MULTI_MASK = ~MULTI_FLAG;
template <typename T>
T* GetPointerFromRaw(PAddr addr) {
return reinterpret_cast<T*>(physical_base + addr);
}
template <typename T>
const T* GetPointerFromRaw(PAddr addr) const {
return reinterpret_cast<T*>(physical_base + addr);
}
template <typename T>
PAddr GetRawPhysicalAddr(const T* ptr) const {
return static_cast<PAddr>(reinterpret_cast<uintptr_t>(ptr) - physical_base);
}
void WalkBlock(const DAddr addr, const std::size_t size, auto on_unmapped, auto on_memory,
auto increment);
void InnerGatherDeviceAddresses(Common::ScratchBuffer<u32>& buffer, PAddr address);
std::unique_ptr<DeviceMemoryManagerAllocator<Traits>> impl;
const uintptr_t physical_base;
DeviceInterface* device_inter;
Common::VirtualBuffer<u32> compressed_physical_ptr;
Common::VirtualBuffer<u32> compressed_device_addr;
Common::VirtualBuffer<u32> continuity_tracker;
// Process memory interfaces
std::deque<size_t> id_pool;
std::deque<Memory::Memory*> registered_processes;
// Memory protection management
static constexpr size_t guest_max_as_bits = 39;
static constexpr size_t guest_as_size = 1ULL << guest_max_as_bits;
static constexpr size_t guest_mask = guest_as_size - 1ULL;
static constexpr size_t asid_start_bit = guest_max_as_bits;
std::pair<Asid, VAddr> ExtractCPUBacking(size_t page_index) {
auto content = cpu_backing_address[page_index];
const VAddr address = content & guest_mask;
const Asid asid{static_cast<size_t>(content >> asid_start_bit)};
return std::make_pair(asid, address);
}
void InsertCPUBacking(size_t page_index, VAddr address, Asid asid) {
cpu_backing_address[page_index] = address | (asid.id << asid_start_bit);
}
Common::VirtualBuffer<VAddr> cpu_backing_address;
using CounterType = u8;
using CounterAtomicType = std::atomic_uint8_t;
static constexpr size_t subentries = 8 / sizeof(CounterType);
static constexpr size_t subentries_mask = subentries - 1;
static constexpr size_t subentries_shift =
std::countr_zero(sizeof(u64)) - std::countr_zero(sizeof(CounterType));
class CounterEntry final {
public:
CounterEntry() = default;
CounterAtomicType& Count(std::size_t page) {
return values[page & subentries_mask];
}
const CounterAtomicType& Count(std::size_t page) const {
return values[page & subentries_mask];
}
private:
std::array<CounterAtomicType, subentries> values{};
};
static_assert(sizeof(CounterEntry) == subentries * sizeof(CounterType),
"CounterEntry should be 8 bytes!");
static constexpr size_t num_counter_entries =
(1ULL << (device_virtual_bits - page_bits)) / subentries;
using CachedPages = std::array<CounterEntry, num_counter_entries>;
std::unique_ptr<CachedPages> cached_pages;
Common::RangeMutex counter_guard;
std::mutex mapping_guard;
};
} // namespace Core
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