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 #define pte_ERROR(e) \
21 printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
22 #define pmd_ERROR(e) \
23 printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
24 #define pgd_ERROR(e) \
25 printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
26
27 /*
28 * The "pgd_xxx()" functions here are trivial for a folded two-level
29 * setup: the pgd is never bad, and a pmd always exists (as it's folded
30 * into the pgd entry)
31 */
32 static inline int pgd_none(pgd_t pgd) { return 0; }
33 static inline int pgd_bad(pgd_t pgd) { return 0; }
34 static inline int pgd_present(pgd_t pgd) { return 1; }
35 #define pgd_clear(xp) do { } while (0)
36
37 /*
38 * Certain architectures need to do special things when PTEs
39 * within a page table are directly modified. Thus, the following
40 * hook is made available.
41 */
42 #define set_pte(pteptr, pteval) (*(pteptr) = pteval)
43 /*
44 * (pmds are folded into pgds so this doesnt get actually called,
45 * but the define is needed for a generic inline function.)
46 */
47 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
48 #define set_pgd(pgdptr, pgdval) (*(pgdptr) = pgdval)
49
50 #define pgd_page(pgd) \
51 ((unsigned long) __va(pgd_val(pgd) & PAGE_MASK))
52
53 static inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address)
54 {
55 return (pmd_t *) dir;
56 }
57
58 #endif /* __ASM_SH_PGTABLE_2LEVEL_H */
59
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