tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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>
11#include <asm/fixmap.h>
12#include <asm/pgtable.h>
13
14void pgd_init(unsigned long page)
15{
16 unsigned long *p, *end;
17
18 p = (unsigned long *) page;
19 end = p + PTRS_PER_PGD;
20
21 while (p < end) {
22 p[0] = (unsigned long) invalid_pmd_table;
23 p[1] = (unsigned long) invalid_pmd_table;
24 p[2] = (unsigned long) invalid_pmd_table;
25 p[3] = (unsigned long) invalid_pmd_table;
26 p[4] = (unsigned long) invalid_pmd_table;
27 p[5] = (unsigned long) invalid_pmd_table;
28 p[6] = (unsigned long) invalid_pmd_table;
29 p[7] = (unsigned long) invalid_pmd_table;
30 p += 8;
31 }
32}
33
34void pmd_init(unsigned long addr, unsigned long pagetable)
35{
36 unsigned long *p, *end;
37
38 p = (unsigned long *) addr;
39 end = p + PTRS_PER_PMD;
40
41 while (p < end) {
42 p[0] = (unsigned long)pagetable;
43 p[1] = (unsigned long)pagetable;
44 p[2] = (unsigned long)pagetable;
45 p[3] = (unsigned long)pagetable;
46 p[4] = (unsigned long)pagetable;
47 p[5] = (unsigned long)pagetable;
48 p[6] = (unsigned long)pagetable;
49 p[7] = (unsigned long)pagetable;
50 p += 8;
51 }
52}
53
54void __init pagetable_init(void)
55{
56 unsigned long vaddr;
57 pgd_t *pgd_base;
58
59 /* Initialize the entire pgd. */
60 pgd_init((unsigned long)swapper_pg_dir);
61 pmd_init((unsigned long)invalid_pmd_table, (unsigned long)invalid_pte_table);
62
63 pgd_base = swapper_pg_dir;
64 /*
65 * Fixed mappings:
66 */
67 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
68 fixrange_init(vaddr, 0, pgd_base);
69}