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(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
33#if defined(CONFIG_TRANSPARENT_HUGEPAGE)
34pmd_t mk_pmd(struct page *page, pgprot_t prot)
35{
36	pmd_t pmd;
37
38	pmd_val(pmd) = (page_to_pfn(page) << _PFN_SHIFT) | pgprot_val(prot);
39
40	return pmd;
41}
42
43
44void set_pmd_at(struct mm_struct *mm, unsigned long addr,
45		pmd_t *pmdp, pmd_t pmd)
46{
47	*pmdp = pmd;
48	flush_tlb_all();
49}
50#endif /* defined(CONFIG_TRANSPARENT_HUGEPAGE) */
51
52void __init pagetable_init(void)
53{
54	unsigned long vaddr;
55	pgd_t *pgd_base;
56#ifdef CONFIG_HIGHMEM
57	pgd_t *pgd;
58	p4d_t *p4d;
59	pud_t *pud;
60	pmd_t *pmd;
61	pte_t *pte;
62#endif
63
64	/* Initialize the entire pgd.  */
65	pgd_init((unsigned long)swapper_pg_dir);
66	pgd_init((unsigned long)swapper_pg_dir
67		 + sizeof(pgd_t) * USER_PTRS_PER_PGD);
68
69	pgd_base = swapper_pg_dir;
70
71	/*
72	 * Fixed mappings:
73	 */
74	vaddr = __fix_to_virt(__end_of_fixed_addresses - 1);
75	fixrange_init(vaddr & PMD_MASK, vaddr + FIXADDR_SIZE, pgd_base);
76
77#ifdef CONFIG_HIGHMEM
78	/*
79	 * Permanent kmaps:
80	 */
81	vaddr = PKMAP_BASE;
82	fixrange_init(vaddr & PMD_MASK, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
83
84	pgd = swapper_pg_dir + pgd_index(vaddr);
85	p4d = p4d_offset(pgd, vaddr);
86	pud = pud_offset(p4d, vaddr);
87	pmd = pmd_offset(pud, vaddr);
88	pte = pte_offset_kernel(pmd, vaddr);
89	pkmap_page_table = pte;
90#endif
91}
92