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