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1da177e4 LT |
1 | #ifndef _ASM_M32R_PGTABLE_2LEVEL_H |
2 | #define _ASM_M32R_PGTABLE_2LEVEL_H | |
3 | ||
4 | #ifdef __KERNEL__ | |
5 | ||
6 | #include <linux/config.h> | |
7 | ||
8 | /* | |
9 | * traditional M32R two-level paging structure: | |
10 | */ | |
11 | ||
12 | #define PGDIR_SHIFT 22 | |
13 | #define PTRS_PER_PGD 1024 | |
14 | ||
15 | /* | |
16 | * the M32R is two-level, so we don't really have any | |
17 | * PMD directory physically. | |
18 | */ | |
19 | #define PMD_SHIFT 22 | |
20 | #define PTRS_PER_PMD 1 | |
21 | ||
22 | #define PTRS_PER_PTE 1024 | |
23 | ||
24 | #define pte_ERROR(e) \ | |
25 | printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) | |
26 | #define pmd_ERROR(e) \ | |
27 | printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e)) | |
28 | #define pgd_ERROR(e) \ | |
29 | printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) | |
30 | ||
31 | /* | |
32 | * The "pgd_xxx()" functions here are trivial for a folded two-level | |
33 | * setup: the pgd is never bad, and a pmd always exists (as it's folded | |
34 | * into the pgd entry) | |
35 | */ | |
36 | static inline int pgd_none(pgd_t pgd) { return 0; } | |
37 | static inline int pgd_bad(pgd_t pgd) { return 0; } | |
38 | static inline int pgd_present(pgd_t pgd) { return 1; } | |
39 | #define pgd_clear(xp) do { } while (0) | |
40 | ||
41 | /* | |
42 | * Certain architectures need to do special things when PTEs | |
43 | * within a page table are directly modified. Thus, the following | |
44 | * hook is made available. | |
45 | */ | |
46 | #define set_pte(pteptr, pteval) (*(pteptr) = pteval) | |
47 | #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) | |
48 | #define set_pte_atomic(pteptr, pteval) set_pte(pteptr, pteval) | |
49 | /* | |
50 | * (pmds are folded into pgds so this doesnt get actually called, | |
51 | * but the define is needed for a generic inline function.) | |
52 | */ | |
53 | #define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval) | |
54 | #define set_pgd(pgdptr, pgdval) (*(pgdptr) = pgdval) | |
55 | ||
56 | #define pgd_page(pgd) \ | |
57 | ((unsigned long) __va(pgd_val(pgd) & PAGE_MASK)) | |
58 | ||
59 | static inline pmd_t *pmd_offset(pgd_t * dir, unsigned long address) | |
60 | { | |
61 | return (pmd_t *) dir; | |
62 | } | |
63 | ||
64 | #define ptep_get_and_clear(mm,addr,xp) __pte(xchg(&(xp)->pte, 0)) | |
65 | #define pte_same(a, b) (pte_val(a) == pte_val(b)) | |
66 | #define pte_page(x) pfn_to_page(pte_pfn(x)) | |
67 | #define pte_none(x) (!pte_val(x)) | |
68 | #define pte_pfn(x) (pte_val(x) >> PAGE_SHIFT) | |
69 | #define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) | |
70 | #define pfn_pmd(pfn, prot) __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) | |
71 | ||
72 | #define PTE_FILE_MAX_BITS 29 | |
73 | #define pte_to_pgoff(pte) (((pte_val(pte) >> 2) & 0xef) | (((pte_val(pte) >> 10)) << 7)) | |
74 | #define pgoff_to_pte(off) ((pte_t) { (((off) & 0xef) << 2) | (((off) >> 7) << 10) | _PAGE_FILE }) | |
75 | ||
76 | #endif /* __KERNEL__ */ | |
77 | ||
78 | #endif /* _ASM_M32R_PGTABLE_2LEVEL_H */ |