#ifndef HAL_VMM_H_
#define HAL_VMM_H_

#include <stdint.h>
#include <stdbool.h>
#include "compiler/attr.h"

enum {
  HAL_PG_PRESENT = 1<<0,
  HAL_PG_RW      = 1<<1,
  HAL_PG_USER    = 1<<2,
};

typedef struct {
  uint64_t pml4;
  uint64_t pml3;
  uint64_t pml2;
  uint64_t pml1;
} PACKED PgIndex;

typedef struct {
  bool present: 1;
  bool rw: 1;
  bool user: 1;
  bool writethrough: 1;
  bool cachedisabled: 1;
  bool accessed: 1;
  bool zero0: 1;
  bool size: 1;
  bool zero1: 1;
  uint8_t avail: 3;
  uint64_t addr: 52;
} PACKED Pte;

typedef struct {
  Pte ents[512];
} PACKED PgTable;

extern PgTable *KERNEL_CR3;

void hal_vmm_init(void);
void hal_vmm_unmap_page(PgTable *pml4, uint64_t virtaddr, uint64_t physaddr);
void hal_vmm_map_page(PgTable *pml4, uint64_t virtaddr, uint64_t physaddr, uint32_t flags);

#endif // HAL_VMM_H_