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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) 2003 by Ralf Baechle | |
7 | */ | |
8 | #include <linux/config.h> | |
9 | #include <linux/init.h> | |
10 | #include <linux/mm.h> | |
11 | #include <linux/bootmem.h> | |
12 | #include <linux/highmem.h> | |
13 | #include <asm/pgtable.h> | |
14 | ||
15 | void pgd_init(unsigned long page) | |
16 | { | |
17 | unsigned long *p = (unsigned long *) page; | |
18 | int i; | |
19 | ||
20 | for (i = 0; i < USER_PTRS_PER_PGD; i+=8) { | |
21 | p[i + 0] = (unsigned long) invalid_pte_table; | |
22 | p[i + 1] = (unsigned long) invalid_pte_table; | |
23 | p[i + 2] = (unsigned long) invalid_pte_table; | |
24 | p[i + 3] = (unsigned long) invalid_pte_table; | |
25 | p[i + 4] = (unsigned long) invalid_pte_table; | |
26 | p[i + 5] = (unsigned long) invalid_pte_table; | |
27 | p[i + 6] = (unsigned long) invalid_pte_table; | |
28 | p[i + 7] = (unsigned long) invalid_pte_table; | |
29 | } | |
30 | } | |
31 | ||
32 | #ifdef CONFIG_HIGHMEM | |
33 | static void __init fixrange_init (unsigned long start, unsigned long end, | |
34 | pgd_t *pgd_base) | |
35 | { | |
36 | pgd_t *pgd; | |
37 | pmd_t *pmd; | |
38 | pte_t *pte; | |
39 | int i, j; | |
40 | unsigned long vaddr; | |
41 | ||
42 | vaddr = start; | |
43 | i = __pgd_offset(vaddr); | |
44 | j = __pmd_offset(vaddr); | |
45 | pgd = pgd_base + i; | |
46 | ||
47 | for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) { | |
48 | pmd = (pmd_t *)pgd; | |
49 | for (; (j < PTRS_PER_PMD) && (vaddr != end); pmd++, j++) { | |
50 | if (pmd_none(*pmd)) { | |
51 | pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); | |
52 | set_pmd(pmd, __pmd((unsigned long)pte)); | |
53 | if (pte != pte_offset_kernel(pmd, 0)) | |
54 | BUG(); | |
55 | } | |
56 | vaddr += PMD_SIZE; | |
57 | } | |
58 | j = 0; | |
59 | } | |
60 | } | |
61 | #endif | |
62 | ||
63 | void __init pagetable_init(void) | |
64 | { | |
65 | #ifdef CONFIG_HIGHMEM | |
66 | unsigned long vaddr; | |
67 | pgd_t *pgd, *pgd_base; | |
68 | pmd_t *pmd; | |
69 | pte_t *pte; | |
70 | #endif | |
71 | ||
72 | /* Initialize the entire pgd. */ | |
73 | pgd_init((unsigned long)swapper_pg_dir); | |
74 | pgd_init((unsigned long)swapper_pg_dir | |
75 | + sizeof(pgd_t) * USER_PTRS_PER_PGD); | |
76 | ||
77 | #ifdef CONFIG_HIGHMEM | |
78 | pgd_base = swapper_pg_dir; | |
79 | ||
80 | /* | |
81 | * Fixed mappings: | |
82 | */ | |
83 | vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; | |
84 | fixrange_init(vaddr, 0, pgd_base); | |
85 | ||
86 | /* | |
87 | * Permanent kmaps: | |
88 | */ | |
89 | vaddr = PKMAP_BASE; | |
90 | fixrange_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base); | |
91 | ||
92 | pgd = swapper_pg_dir + __pgd_offset(vaddr); | |
93 | pmd = pmd_offset(pgd, vaddr); | |
94 | pte = pte_offset_kernel(pmd, vaddr); | |
95 | pkmap_page_table = pte; | |
96 | #endif | |
97 | } |