page_table.h

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#pragma once
 
#include <memory>
 
#include "contur/core/error.h"
#include "contur/core/types.h"
 
namespace contur {

    struct PageTableEntry
    {
        FrameId frameId = INVALID_FRAME; 
        bool present = false;            
        bool dirty = false;              
        bool referenced = false;         
    };

    class PageTable
    {
        public:
        explicit PageTable(std::size_t pageCount);
        ~PageTable();
 
        // Non-copyable, movable
        PageTable(const PageTable &) = delete;
        PageTable &operator=(const PageTable &) = delete;
        PageTable(PageTable &&) noexcept;
        PageTable &operator=(PageTable &&) noexcept;

        [[nodiscard]] Result<void> map(std::size_t virtualPage, FrameId frame);

        [[nodiscard]] Result<void> unmap(std::size_t virtualPage);

        [[nodiscard]] Result<FrameId> translate(std::size_t virtualPage) const;

        [[nodiscard]] Result<PageTableEntry> getEntry(std::size_t virtualPage) const;

        [[nodiscard]] Result<void> setReferenced(std::size_t virtualPage, bool value);

        [[nodiscard]] Result<void> setDirty(std::size_t virtualPage, bool value);

        [[nodiscard]] Result<void> clearReferenced(std::size_t virtualPage);

        [[nodiscard]] std::size_t pageCount() const noexcept;

        [[nodiscard]] std::size_t presentCount() const noexcept;

        void clear();
 
        private:
        struct Impl;
        std::unique_ptr<Impl> impl_;
    };
 
} // namespace contur