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#include <asm/pgalloc.h>
14
15void pgd_init(unsigned long page)
16{
17	unsigned long *p, *end;
18	unsigned long entry;
19
20#ifdef __PAGETABLE_PMD_FOLDED
21	entry = (unsigned long)invalid_pte_table;
22#else
23	entry = (unsigned long)invalid_pmd_table;
24#endif
25
26 	p = (unsigned long *) page;
27	end = p + PTRS_PER_PGD;
28
29	while (p < end) {
30		p[0] = entry;
31		p[1] = entry;
32		p[2] = entry;
33		p[3] = entry;
34		p[4] = entry;
35		p[5] = entry;
36		p[6] = entry;
37		p[7] = entry;
38		p += 8;
39	}
40}
41
42#ifndef __PAGETABLE_PMD_FOLDED
43void pmd_init(unsigned long addr, unsigned long pagetable)
44{
45	unsigned long *p, *end;
46
47 	p = (unsigned long *) addr;
48	end = p + PTRS_PER_PMD;
49
50	while (p < end) {
51		p[0] = pagetable;
52		p[1] = pagetable;
53		p[2] = pagetable;
54		p[3] = pagetable;
55		p[4] = pagetable;
56		p[5] = pagetable;
57		p[6] = pagetable;
58		p[7] = pagetable;
59		p += 8;
60	}
61}
62#endif
63
64void __init pagetable_init(void)
65{
66	unsigned long vaddr;
67	pgd_t *pgd_base;
68
69	/* Initialize the entire pgd.  */
70	pgd_init((unsigned long)swapper_pg_dir);
71#ifndef __PAGETABLE_PMD_FOLDED
72	pmd_init((unsigned long)invalid_pmd_table, (unsigned long)invalid_pte_table);
73#endif
74	pgd_base = swapper_pg_dir;
75	/*
76	 * Fixed mappings:
77	 */
78	vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
79	fixrange_init(vaddr, vaddr + FIXADDR_SIZE, pgd_base);
80}