b3c8997829
Makes page tables and virtual buffers able to be moved, but not copied, making the interface more flexible. Previously, with the destructor specified, but no move assignment or constructor specified, they wouldn't be implicitly generated.
82 lines
2.4 KiB
C++
82 lines
2.4 KiB
C++
// Copyright 2019 yuzu Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <tuple>
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#include "common/common_types.h"
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#include "common/memory_hook.h"
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#include "common/virtual_buffer.h"
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namespace Common {
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enum class PageType : u8 {
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/// Page is unmapped and should cause an access error.
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Unmapped,
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/// Page is mapped to regular memory. This is the only type you can get pointers to.
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Memory,
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/// Page is mapped to regular memory, but also needs to check for rasterizer cache flushing and
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/// invalidation
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RasterizerCachedMemory,
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/// Page is mapped to a I/O region. Writing and reading to this page is handled by functions.
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Special,
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/// Page is allocated for use.
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Allocated,
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};
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struct SpecialRegion {
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enum class Type {
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DebugHook,
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IODevice,
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} type;
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MemoryHookPointer handler;
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[[nodiscard]] bool operator<(const SpecialRegion& other) const {
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return std::tie(type, handler) < std::tie(other.type, other.handler);
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}
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[[nodiscard]] bool operator==(const SpecialRegion& other) const {
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return std::tie(type, handler) == std::tie(other.type, other.handler);
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}
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};
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/**
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* A (reasonably) fast way of allowing switchable and remappable process address spaces. It loosely
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* mimics the way a real CPU page table works.
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*/
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struct PageTable {
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PageTable();
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~PageTable() noexcept;
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PageTable(const PageTable&) = delete;
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PageTable& operator=(const PageTable&) = delete;
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PageTable(PageTable&&) noexcept = default;
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PageTable& operator=(PageTable&&) noexcept = default;
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/**
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* Resizes the page table to be able to accomodate enough pages within
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* a given address space.
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*
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* @param address_space_width_in_bits The address size width in bits.
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* @param page_size_in_bits The page size in bits.
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* @param has_attribute Whether or not this page has any backing attributes.
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*/
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void Resize(std::size_t address_space_width_in_bits, std::size_t page_size_in_bits,
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bool has_attribute);
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/**
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* Vector of memory pointers backing each page. An entry can only be non-null if the
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* corresponding entry in the `attributes` vector is of type `Memory`.
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*/
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VirtualBuffer<u8*> pointers;
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VirtualBuffer<u64> backing_addr;
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VirtualBuffer<PageType> attributes;
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};
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} // namespace Common
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