pgtable-32.c

 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}