96 lines
2.7 KiB
C++
96 lines
2.7 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 <vector>
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#include <boost/icl/interval_map.hpp>
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#include "common/common_types.h"
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#include "common/memory_hook.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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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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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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explicit PageTable(std::size_t page_size_in_bits);
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~PageTable();
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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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*/
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void Resize(std::size_t address_space_width_in_bits);
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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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std::vector<u8*> pointers;
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/**
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* Contains MMIO handlers that back memory regions whose entries in the `attribute` vector is
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* of type `Special`.
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*/
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boost::icl::interval_map<u64, std::set<SpecialRegion>> special_regions;
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/**
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* Vector of fine grained page attributes. If it is set to any value other than `Memory`, then
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* the corresponding entry in `pointers` MUST be set to null.
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*/
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std::vector<PageType> attributes;
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const std::size_t page_size_in_bits{};
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};
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/**
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* A more advanced Page Table with the ability to save a backing address when using it
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* depends on another MMU.
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*/
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struct BackingPageTable : PageTable {
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explicit BackingPageTable(std::size_t page_size_in_bits);
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~BackingPageTable();
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void Resize(std::size_t address_space_width_in_bits);
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std::vector<u64> backing_addr;
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};
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} // namespace Common
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