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