Luna/kernel/include/memory/Paging.h

#pragma once
#include <stdint.h>

#ifndef PAGE_SIZE
#define PAGE_SIZE 4096
#endif

struct PageDirectoryEntry
{
    bool present : 1;
    bool read_write : 1;
    bool user : 1;
    bool write_through : 1;
    bool cache_disabled : 1;
    bool accessed : 1;
    bool ignore0 : 1;
    bool larger_pages : 1;
    bool ignore1 : 1;
    uint8_t available : 3;
    uint64_t address : 48;
    bool owned_by_task : 1; // Part of the available for OS use bits.
    uint8_t available2 : 2;
    bool no_execute : 1;

    void set_address(uint64_t addr);
    uint64_t get_address();
} __attribute__((packed));

struct PageTable
{
    PageDirectoryEntry entries[512];
} __attribute__((aligned(PAGE_SIZE)));

static_assert(sizeof(PageDirectoryEntry) == 8UL);