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