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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> | |
84fd089a | 13 | #include <asm/fixmap.h> |
1da177e4 LT |
14 | #include <asm/pgtable.h> |
15 | ||
16 | void pgd_init(unsigned long page) | |
17 | { | |
18 | unsigned long *p = (unsigned long *) page; | |
19 | int i; | |
20 | ||
21 | for (i = 0; i < USER_PTRS_PER_PGD; i+=8) { | |
22 | p[i + 0] = (unsigned long) invalid_pte_table; | |
23 | p[i + 1] = (unsigned long) invalid_pte_table; | |
24 | p[i + 2] = (unsigned long) invalid_pte_table; | |
25 | p[i + 3] = (unsigned long) invalid_pte_table; | |
26 | p[i + 4] = (unsigned long) invalid_pte_table; | |
27 | p[i + 5] = (unsigned long) invalid_pte_table; | |
28 | p[i + 6] = (unsigned long) invalid_pte_table; | |
29 | p[i + 7] = (unsigned long) invalid_pte_table; | |
30 | } | |
31 | } | |
32 | ||
1da177e4 LT |
33 | void __init pagetable_init(void) |
34 | { | |
35 | #ifdef CONFIG_HIGHMEM | |
36 | unsigned long vaddr; | |
37 | pgd_t *pgd, *pgd_base; | |
38 | pmd_t *pmd; | |
39 | pte_t *pte; | |
40 | #endif | |
41 | ||
42 | /* Initialize the entire pgd. */ | |
43 | pgd_init((unsigned long)swapper_pg_dir); | |
44 | pgd_init((unsigned long)swapper_pg_dir | |
45 | + sizeof(pgd_t) * USER_PTRS_PER_PGD); | |
46 | ||
47 | #ifdef CONFIG_HIGHMEM | |
48 | pgd_base = swapper_pg_dir; | |
49 | ||
50 | /* | |
51 | * Fixed mappings: | |
52 | */ | |
53 | vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; | |
54 | fixrange_init(vaddr, 0, pgd_base); | |
55 | ||
56 | /* | |
57 | * Permanent kmaps: | |
58 | */ | |
59 | vaddr = PKMAP_BASE; | |
60 | fixrange_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base); | |
61 | ||
62 | pgd = swapper_pg_dir + __pgd_offset(vaddr); | |
63 | pmd = pmd_offset(pgd, vaddr); | |
64 | pte = pte_offset_kernel(pmd, vaddr); | |
65 | pkmap_page_table = pte; | |
66 | #endif | |
67 | } |