Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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) 2003 by Ralf Baechle
7 */
8#include <linux/init.h>
9#include <linux/mm.h>
10#include <linux/memblock.h>
11#include <linux/highmem.h>
12#include <asm/fixmap.h>
13#include <asm/pgalloc.h>
14#include <asm/tlbflush.h>
15
16void pgd_init(void *addr)
17{
18 unsigned long *p = (unsigned long *)addr;
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
33#if defined(CONFIG_TRANSPARENT_HUGEPAGE)
34void set_pmd_at(struct mm_struct *mm, unsigned long addr,
35 pmd_t *pmdp, pmd_t pmd)
36{
37 *pmdp = pmd;
38}
39#endif /* defined(CONFIG_TRANSPARENT_HUGEPAGE) */
40
41void __init pagetable_init(void)
42{
43 unsigned long vaddr;
44 pgd_t *pgd_base;
45#ifdef CONFIG_HIGHMEM
46 pgd_t *pgd;
47 p4d_t *p4d;
48 pud_t *pud;
49 pmd_t *pmd;
50 pte_t *pte;
51#endif
52
53 /* Initialize the entire pgd. */
54 pgd_init(swapper_pg_dir);
55 pgd_init(&swapper_pg_dir[USER_PTRS_PER_PGD]);
56
57 pgd_base = swapper_pg_dir;
58
59 /*
60 * Fixed mappings:
61 */
62 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1);
63 fixrange_init(vaddr & PMD_MASK, vaddr + FIXADDR_SIZE, pgd_base);
64
65#ifdef CONFIG_HIGHMEM
66 /*
67 * Permanent kmaps:
68 */
69 vaddr = PKMAP_BASE;
70 fixrange_init(vaddr & PMD_MASK, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
71
72 pgd = swapper_pg_dir + pgd_index(vaddr);
73 p4d = p4d_offset(pgd, vaddr);
74 pud = pud_offset(p4d, vaddr);
75 pmd = pmd_offset(pud, vaddr);
76 pte = pte_offset_kernel(pmd, vaddr);
77 pkmap_page_table = pte;
78#endif
79}