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1da177e4 LT |
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 | */ | |
33 | static inline int pgd_none(pgd_t pgd) { return 0; } | |
34 | static inline int pgd_bad(pgd_t pgd) { return 0; } | |
35 | static inline int pgd_present(pgd_t pgd) { return 1; } | |
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 | #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) | |
45 | ||
46 | /* | |
47 | * (pmds are folded into pgds so this doesn't get actually called, | |
48 | * but the define is needed for a generic inline function.) | |
49 | */ | |
50 | #define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval) | |
51 | #define set_pgd(pgdptr, pgdval) (*(pgdptr) = pgdval) | |
52 | ||
53 | #define pgd_page(pgd) \ | |
54 | ((unsigned long) __va(pgd_val(pgd) & PAGE_MASK)) | |
55 | ||
56 | static inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address) | |
57 | { | |
58 | return (pmd_t *) dir; | |
59 | } | |
60 | ||
61 | #define pte_pfn(x) ((unsigned long)(((x).pte >> PAGE_SHIFT))) | |
62 | #define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) | |
63 | #define pfn_pmd(pfn, prot) __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) | |
64 | ||
65 | #endif /* !__ASSEMBLY__ */ | |
66 | ||
67 | #endif /* __ASM_SH_PGTABLE_2LEVEL_H */ |