#pragma once

#include <stddef.h>
#include <stdint.h>

#define PRESENT    (1 << 0)
#define RW         (1 << 1)
#define SUPERVISOR (0 << 2)
#define ACCESSED   (1 << 4)
#define INIT_FLAGS (PRESENT | RW | SUPERVISOR)
#define PAGE_SIZE  4096
#define PT_SIZE    1024
#define PD_SIZE    1024
#define PAGE_MASK  0xFFFFF000
#define HEAP_END   0xC0000000

extern uint32_t boot_page_directory;
extern uint32_t *page_directory;
extern uint32_t page_table_default[1024];

uint32_t *virt_to_phys(uint32_t *virt_addr);
void init_memory(void);
void *alloc_frames(size_t size);
int free_frames(void *frame_ptr, size_t size);
void *alloc_pages(size_t size, uint32_t **frame_ptr);
int free_pages(void *page_ptr, size_t size);