#pragma once

#include <stddef.h>
#include <dtb.h>

#define MMAN_NO_PAGE 0xffffffffffffffff
#define PAGE_SIZE (1 << 12)

// PAGE_FREE      => available
// PAGE_ALLOCATED => this range is allocated explicitly
// PAGE_DIVIDED   => this range is divided into smaller range
// PAGE_RESERVED  => this range is reserved explicitly
typedef enum :uint8_t {
  PAGE_FREE      = 0,
  PAGE_ALLOCATED = 1,
  PAGE_DIVIDED   = 2,
  PAGE_RESERVED  = 3,
} page_state_t;

typedef struct {
  page_state_t state;
  uint64_t maxsz;
} page_header_t;

void mman_init();

void *allocate_page(size_t page_cnt);
void free_page(void *ptr);
void reserve_page(void *begin, void *end);

void mman_fdt_memory_cb_func(const vector_t *props);

extern fdt_callback_t mman_dtb_memory_cb;
extern void *mman_memory_start;
extern void *mman_memory_end;
extern size_t mman_page_cnt;
extern page_header_t *mman_frame_array;