//
// Created by rick on 21-02-21.
//

#include "paging.h"
#include <types.h>
#include <stdbool.h>
#include <attributes.h>

#define TABLE_ADDR_MASK 0xFFFFF000
#define DIRECTORY_SIZE 1024

const uint32_t x = TABLE_ADDR_MASK;
typedef struct {
    union {
        struct {
            bool present: 1;
            bool read_write: 1;
            bool user_mode: 1;
            bool write_through: 1;
            bool cache_disabled: 1;
            bool accessed: 1;
            char ignored: 1;
            bool page_size: 1;
            bool global: 1; // ignored
            uint8_t avail: 3;
        } packed;
        uint32_t addr;
    };
} packed page_directory_entry;

typedef struct {
    union {
        struct {
            bool present: 1;
            bool read_write: 1;
            bool user_supervisor: 1;
            bool write_through: 1;
            bool cache_disabled: 1;
            bool accessed: 1;
            bool dirty: 1;
            char ignored: 1;
            bool global: 1;
            uint8_t available: 3;
        } packed;
        uint32_t addr;
    };
} packed page_table_entry;

page_directory_entry page_directory[DIRECTORY_SIZE] at_aligned(4096);

void page_pre_init() {
    for (int i = 0; i < DIRECTORY_SIZE; ++i) {
        page_directory[i].read_write = true;
        page_directory[i].user_mode = false;
        page_directory[i].present = false;
    }
}