1 #ifndef __ASM_SH_PGTABLE_2LEVEL_H
2 #define __ASM_SH_PGTABLE_2LEVEL_H
3
4 /*
5 * traditional two-level paging structure:
6 */
7
8 #define PGDIR_SHIFT 22
9 #define PTRS_PER_PGD 1024
10
11 /*
12 * this is two-level, so we don't really have any
13 * PMD directory physically.
14 */
15 #define PMD_SHIFT 22
16 #define PTRS_PER_PMD 1
17
18 #define PTRS_PER_PTE 1024
19
20 #ifndef __ASSEMBLY__
21 #define pte_ERROR(e) \
22 printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
23 #define pmd_ERROR(e) \
24 printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
25 #define pgd_ERROR(e) \
26 printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
27
28 /*
29 * The "pgd_xxx()" functions here are trivial for a folded two-level
30 * setup: the pgd is never bad, and a pmd always exists (as it's folded
31 * into the pgd entry)
32 */
pgd_none(pgd_t pgd)33 static inline int pgd_none(pgd_t pgd) { return 0; }
pgd_bad(pgd_t pgd)34 static inline int pgd_bad(pgd_t pgd) { return 0; }
pgd_present(pgd_t pgd)35 static inline int pgd_present(pgd_t pgd) { return 1; }
pgd_clear(pgd_t * pgdp)36 static inline void pgd_clear (pgd_t * pgdp) { }
37
38 /*
39 * Certain architectures need to do special things when PTEs
40 * within a page table are directly modified. Thus, the following
41 * hook is made available.
42 */
43 #define set_pte(pteptr, pteval) (*(pteptr) = pteval)
44 /*
45 * (pmds are folded into pgds so this doesn't get actually called,
46 * but the define is needed for a generic inline function.)
47 */
48 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
49 #define set_pgd(pgdptr, pgdval) (*(pgdptr) = pgdval)
50
51 #define pgd_page(pgd) \
52 ((unsigned long) __va(pgd_val(pgd) & PAGE_MASK))
53
pmd_offset(pgd_t * dir,unsigned long address)54 static inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address)
55 {
56 return (pmd_t *) dir;
57 }
58 #endif /* !__ASSEMBLY__ */
59
60 #endif /* __ASM_SH_PGTABLE_2LEVEL_H */
61