1 #ifndef VM_H_

2 #define VM_H_

3

4 #include <stdlib.h>

5 #include "mboot.h"

6

7 /* page mapping flags */

8 #define PG_PRESENT (1 << 0)

9 #define PG_WRITABLE (1 << 1)

10 #define PG_USER (1 << 2)

11 #define PG_WRITE_THROUGH (1 << 3)

12 #define PG_NOCACHE (1 << 4)

13 #define PG_ACCESSED (1 << 5)

14 #define PG_DIRTY (1 << 6)

15 #define PG_TYPE (1 << 7)

16 /* PG_GLOBAL mappings won't flush from TLB */

17 #define PG_GLOBAL (1 << 8)

18

19

20 #define PGSIZE 4096

21 #define PGOFFS_MASK 0xfff

22 #define PGNUM_MASK 0xfffff000

23 #define PGENT_ADDR_MASK PGNUM_MASK

24

25 #define ADDR_TO_PAGE(x) ((uint32_t)(x) >> 12)

26 #define PAGE_TO_ADDR(x) ((uint32_t)(x) << 12)

27

28 #define ADDR_TO_PGTBL(x) ((uint32_t)(x) >> 22)

29 #define ADDR_TO_PGTBL_PG(x) (((uint32_t)(x) >> 12) & 0x3ff)

30 #define ADDR_TO_PGOFFS(x) ((uint32_t)(x) & PGOFFS_MASK)

31

32 #define PAGE_TO_PGTBL(x) ((uint32_t)(x) >> 10)

33 #define PAGE_TO_PGTBL_PG(x) ((uint32_t)(x) & 0x3ff)

34

35

36 void init_vm(struct mboot_info *mb);

37

38 void map_page(int vpage, int ppage, unsigned int attr);

39 void map_page_range(int vpg_start, int pgcount, int ppg_start, unsigned int attr);

40

41 void map_mem_range(uint32_t vaddr, size_t sz, uint32_t paddr, unsigned int attr);

42

43 uint32_t virt_to_phys(uint32_t vaddr);

44

45 #endif /* VM_H_ */