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/export.h>
10 #include <linux/init.h>
11 #include <linux/mm.h>
12 #include <asm/fixmap.h>
13 #include <asm/pgalloc.h>
14 #include <asm/tlbflush.h>
15
pgd_init(unsigned long page)16 void pgd_init(unsigned long page)
17 {
18 unsigned long *p, *end;
19 unsigned long entry;
20
21 #if !defined(__PAGETABLE_PUD_FOLDED)
22 entry = (unsigned long)invalid_pud_table;
23 #elif !defined(__PAGETABLE_PMD_FOLDED)
24 entry = (unsigned long)invalid_pmd_table;
25 #else
26 entry = (unsigned long)invalid_pte_table;
27 #endif
28
29 p = (unsigned long *) page;
30 end = p + PTRS_PER_PGD;
31
32 do {
33 p[0] = entry;
34 p[1] = entry;
35 p[2] = entry;
36 p[3] = entry;
37 p[4] = entry;
38 p += 8;
39 p[-3] = entry;
40 p[-2] = entry;
41 p[-1] = entry;
42 } while (p != end);
43 }
44
45 #ifndef __PAGETABLE_PMD_FOLDED
pmd_init(unsigned long addr,unsigned long pagetable)46 void pmd_init(unsigned long addr, unsigned long pagetable)
47 {
48 unsigned long *p, *end;
49
50 p = (unsigned long *) addr;
51 end = p + PTRS_PER_PMD;
52
53 do {
54 p[0] = pagetable;
55 p[1] = pagetable;
56 p[2] = pagetable;
57 p[3] = pagetable;
58 p[4] = pagetable;
59 p += 8;
60 p[-3] = pagetable;
61 p[-2] = pagetable;
62 p[-1] = pagetable;
63 } while (p != end);
64 }
65 EXPORT_SYMBOL_GPL(pmd_init);
66 #endif
67
68 #ifndef __PAGETABLE_PUD_FOLDED
pud_init(unsigned long addr,unsigned long pagetable)69 void pud_init(unsigned long addr, unsigned long pagetable)
70 {
71 unsigned long *p, *end;
72
73 p = (unsigned long *)addr;
74 end = p + PTRS_PER_PUD;
75
76 do {
77 p[0] = pagetable;
78 p[1] = pagetable;
79 p[2] = pagetable;
80 p[3] = pagetable;
81 p[4] = pagetable;
82 p += 8;
83 p[-3] = pagetable;
84 p[-2] = pagetable;
85 p[-1] = pagetable;
86 } while (p != end);
87 }
88 #endif
89
mk_pmd(struct page * page,pgprot_t prot)90 pmd_t mk_pmd(struct page *page, pgprot_t prot)
91 {
92 pmd_t pmd;
93
94 pmd_val(pmd) = (page_to_pfn(page) << _PFN_SHIFT) | pgprot_val(prot);
95
96 return pmd;
97 }
98
set_pmd_at(struct mm_struct * mm,unsigned long addr,pmd_t * pmdp,pmd_t pmd)99 void set_pmd_at(struct mm_struct *mm, unsigned long addr,
100 pmd_t *pmdp, pmd_t pmd)
101 {
102 *pmdp = pmd;
103 flush_tlb_all();
104 }
105
pagetable_init(void)106 void __init pagetable_init(void)
107 {
108 unsigned long vaddr;
109 pgd_t *pgd_base;
110
111 /* Initialize the entire pgd. */
112 pgd_init((unsigned long)swapper_pg_dir);
113 #ifndef __PAGETABLE_PUD_FOLDED
114 pud_init((unsigned long)invalid_pud_table, (unsigned long)invalid_pmd_table);
115 #endif
116 #ifndef __PAGETABLE_PMD_FOLDED
117 pmd_init((unsigned long)invalid_pmd_table, (unsigned long)invalid_pte_table);
118 #endif
119 pgd_base = swapper_pg_dir;
120 /*
121 * Fixed mappings:
122 */
123 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
124 fixrange_init(vaddr, vaddr + FIXADDR_SIZE, pgd_base);
125 }
126
