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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 "common/common_types.h"
#include "common/virtual_buffer.h"
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);
void Unmap(size_t virtual_offset, size_t length);
void Protect(size_t virtual_offset, size_t length, bool read, bool write, bool execute = false);
void EnableDirectMappedAddress();
[[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
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