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/bootmem.h>
11#include <linux/highmem.h>
12#include <asm/fixmap.h>
13#include <asm/pgtable.h>
14#include <asm/pgalloc.h>
15
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
33void __init pagetable_init(void)
34{
35	unsigned long vaddr;
36	pgd_t *pgd_base;
37#ifdef CONFIG_HIGHMEM
38	pgd_t *pgd;
39	pud_t *pud;
40	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
49	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, vaddr + FIXADDR_SIZE, pgd_base);
56
57#ifdef CONFIG_HIGHMEM
58	/*
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);
65	pud = pud_offset(pgd, vaddr);
66	pmd = pmd_offset(pud, vaddr);
67	pte = pte_offset_kernel(pmd, vaddr);
68	pkmap_page_table = pte;
69#endif
70}