| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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 | } |