suyu/src/common/host_memory.h
Markus Wick 7f85abb281 common/host_memory: Implement a fallback if fastmem fails.
This falls back to the old approach of using a virtual buffer.

Windows is untested, but this build should fix support for Windows < 10 v1803. However without fastmem support at all.
2021-06-11 17:27:17 +02:00

70 lines
1.9 KiB
C++

// Copyright 2019 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <memory>
#include "common/common_types.h"
#include "common/virtual_buffer.h"
namespace Common {
/**
* 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);
void Unmap(size_t virtual_offset, size_t length);
void Protect(size_t virtual_offset, size_t length, bool read, bool write);
[[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;
}
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