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1da177e4 LT |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (C) 1999, 2000 by Silicon Graphics | |
7 | * Copyright (C) 2003 by Ralf Baechle | |
8 | */ | |
9 | #include <linux/init.h> | |
10 | #include <linux/mm.h> | |
f8829cae | 11 | #include <asm/fixmap.h> |
1da177e4 | 12 | #include <asm/pgtable.h> |
6a1e5529 | 13 | #include <asm/pgalloc.h> |
970d032f | 14 | #include <asm/tlbflush.h> |
1da177e4 LT |
15 | |
16 | void pgd_init(unsigned long page) | |
17 | { | |
18 | unsigned long *p, *end; | |
325f8a0a DD |
19 | unsigned long entry; |
20 | ||
21 | #ifdef __PAGETABLE_PMD_FOLDED | |
22 | entry = (unsigned long)invalid_pte_table; | |
23 | #else | |
24 | entry = (unsigned long)invalid_pmd_table; | |
25 | #endif | |
1da177e4 | 26 | |
70342287 | 27 | p = (unsigned long *) page; |
1da177e4 LT |
28 | end = p + PTRS_PER_PGD; |
29 | ||
f59a2d22 | 30 | do { |
325f8a0a DD |
31 | p[0] = entry; |
32 | p[1] = entry; | |
33 | p[2] = entry; | |
34 | p[3] = entry; | |
35 | p[4] = entry; | |
1da177e4 | 36 | p += 8; |
f59a2d22 DD |
37 | p[-3] = entry; |
38 | p[-2] = entry; | |
39 | p[-1] = entry; | |
40 | } while (p != end); | |
1da177e4 LT |
41 | } |
42 | ||
325f8a0a | 43 | #ifndef __PAGETABLE_PMD_FOLDED |
1da177e4 LT |
44 | void pmd_init(unsigned long addr, unsigned long pagetable) |
45 | { | |
46 | unsigned long *p, *end; | |
47 | ||
70342287 | 48 | p = (unsigned long *) addr; |
1da177e4 LT |
49 | end = p + PTRS_PER_PMD; |
50 | ||
f59a2d22 | 51 | do { |
325f8a0a DD |
52 | p[0] = pagetable; |
53 | p[1] = pagetable; | |
54 | p[2] = pagetable; | |
55 | p[3] = pagetable; | |
56 | p[4] = pagetable; | |
1da177e4 | 57 | p += 8; |
f59a2d22 DD |
58 | p[-3] = pagetable; |
59 | p[-2] = pagetable; | |
60 | p[-1] = pagetable; | |
61 | } while (p != end); | |
1da177e4 | 62 | } |
325f8a0a | 63 | #endif |
1da177e4 | 64 | |
970d032f RB |
65 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
66 | ||
67 | void pmdp_splitting_flush(struct vm_area_struct *vma, | |
68 | unsigned long address, | |
69 | pmd_t *pmdp) | |
70 | { | |
71 | if (!pmd_trans_splitting(*pmdp)) { | |
72 | pmd_t pmd = pmd_mksplitting(*pmdp); | |
73 | set_pmd_at(vma->vm_mm, address, pmdp, pmd); | |
74 | } | |
75 | } | |
76 | ||
77 | #endif | |
78 | ||
79 | pmd_t mk_pmd(struct page *page, pgprot_t prot) | |
80 | { | |
81 | pmd_t pmd; | |
82 | ||
83 | pmd_val(pmd) = (page_to_pfn(page) << _PFN_SHIFT) | pgprot_val(prot); | |
84 | ||
85 | return pmd; | |
86 | } | |
87 | ||
88 | void set_pmd_at(struct mm_struct *mm, unsigned long addr, | |
89 | pmd_t *pmdp, pmd_t pmd) | |
90 | { | |
91 | *pmdp = pmd; | |
92 | flush_tlb_all(); | |
93 | } | |
94 | ||
1da177e4 LT |
95 | void __init pagetable_init(void) |
96 | { | |
f8829cae RB |
97 | unsigned long vaddr; |
98 | pgd_t *pgd_base; | |
99 | ||
1da177e4 LT |
100 | /* Initialize the entire pgd. */ |
101 | pgd_init((unsigned long)swapper_pg_dir); | |
325f8a0a | 102 | #ifndef __PAGETABLE_PMD_FOLDED |
1da177e4 | 103 | pmd_init((unsigned long)invalid_pmd_table, (unsigned long)invalid_pte_table); |
325f8a0a | 104 | #endif |
f8829cae RB |
105 | pgd_base = swapper_pg_dir; |
106 | /* | |
107 | * Fixed mappings: | |
108 | */ | |
109 | vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; | |
464fd83e | 110 | fixrange_init(vaddr, vaddr + FIXADDR_SIZE, pgd_base); |
1da177e4 | 111 | } |