blob: 575e4019227b0916d649b108165f2d05812660a5 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07008#include <linux/init.h>
9#include <linux/mm.h>
10#include <linux/bootmem.h>
11#include <linux/highmem.h>
Ralf Baechle84fd0892005-02-07 16:13:07 +000012#include <asm/fixmap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <asm/pgtable.h>
Atsushi Nemoto6a1e5522007-02-19 01:27:34 +090014#include <asm/pgalloc.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015
16void 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070033void __init pagetable_init(void)
34{
Linus Torvalds1da177e2005-04-16 15:20:36 -070035 unsigned long vaddr;
Ralf Baechlef8829ca2006-10-21 23:17:35 +010036 pgd_t *pgd_base;
37#ifdef CONFIG_HIGHMEM
38 pgd_t *pgd;
Ralf Baechlec6e8b582005-02-10 12:19:59 +000039 pud_t *pud;
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 pmd_t *pmd;
41 pte_t *pte;
42#endif
43
44 /* Initialize the entire pgd. */
45 pgd_init((unsigned long)swapper_pg_dir);
46 pgd_init((unsigned long)swapper_pg_dir
47 + sizeof(pgd_t) * USER_PTRS_PER_PGD);
48
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 pgd_base = swapper_pg_dir;
50
51 /*
52 * Fixed mappings:
53 */
54 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
55 fixrange_init(vaddr, 0, pgd_base);
56
Ralf Baechlef8829ca2006-10-21 23:17:35 +010057#ifdef CONFIG_HIGHMEM
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 /*
59 * Permanent kmaps:
60 */
61 vaddr = PKMAP_BASE;
62 fixrange_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
63
64 pgd = swapper_pg_dir + __pgd_offset(vaddr);
Ralf Baechlec6e8b582005-02-10 12:19:59 +000065 pud = pud_offset(pgd, vaddr);
66 pmd = pmd_offset(pud, vaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 pte = pte_offset_kernel(pmd, vaddr);
68 pkmap_page_table = pte;
69#endif
70}