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// Copyright 2019 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <tuple>
#include "common/common_types.h"
#include "common/memory_hook.h"
#include "common/virtual_buffer.h"
namespace Common {
enum class PageType : u8 {
/// Page is unmapped and should cause an access error.
Unmapped,
/// Page is mapped to regular memory. This is the only type you can get pointers to.
Memory,
/// Page is mapped to regular memory, but also needs to check for rasterizer cache flushing and
/// invalidation
RasterizerCachedMemory,
/// Page is mapped to a I/O region. Writing and reading to this page is handled by functions.
Special,
/// Page is allocated for use.
Allocated,
};
struct SpecialRegion {
enum class Type {
DebugHook,
IODevice,
} type;
MemoryHookPointer handler;
[[nodiscard]] bool operator<(const SpecialRegion& other) const {
return std::tie(type, handler) < std::tie(other.type, other.handler);
}
[[nodiscard]] bool operator==(const SpecialRegion& other) const {
return std::tie(type, handler) == std::tie(other.type, other.handler);
}
};
/**
* A (reasonably) fast way of allowing switchable and remappable process address spaces. It loosely
* mimics the way a real CPU page table works.
*/
struct PageTable {
PageTable();
~PageTable() noexcept;
PageTable(const PageTable&) = delete;
PageTable& operator=(const PageTable&) = delete;
PageTable(PageTable&&) noexcept = default;
PageTable& operator=(PageTable&&) noexcept = default;
/**
* Resizes the page table to be able to accomodate enough pages within
* a given address space.
*
* @param address_space_width_in_bits The address size width in bits.
* @param page_size_in_bits The page size in bits.
* @param has_attribute Whether or not this page has any backing attributes.
*/
void Resize(std::size_t address_space_width_in_bits, std::size_t page_size_in_bits,
bool has_attribute);
/**
* Vector of memory pointers backing each page. An entry can only be non-null if the
* corresponding entry in the `attributes` vector is of type `Memory`.
*/
VirtualBuffer<u8*> pointers;
VirtualBuffer<u64> backing_addr;
VirtualBuffer<PageType> attributes;
};
} // namespace Common
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