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/pgalloc.h>
14#include <asm/tlbflush.h>
15
16void pgd_init(void *addr)
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 *) addr;
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
46void pmd_init(void *addr)
47{
48 unsigned long *p, *end;
49 unsigned long pagetable = (unsigned long)invalid_pte_table;
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(void *addr)
71{
72 unsigned long *p, *end;
73 unsigned long pagetable = (unsigned long)invalid_pmd_table;
74
75 p = (unsigned long *)addr;
76 end = p + PTRS_PER_PUD;
77
78 do {
79 p[0] = pagetable;
80 p[1] = pagetable;
81 p[2] = pagetable;
82 p[3] = pagetable;
83 p[4] = pagetable;
84 p += 8;
85 p[-3] = pagetable;
86 p[-2] = pagetable;
87 p[-1] = pagetable;
88 } while (p != end);
89}
90#endif
91
92pmd_t mk_pmd(struct page *page, pgprot_t prot)
93{
94 pmd_t pmd;
95
96 pmd_val(pmd) = (page_to_pfn(page) << _PFN_SHIFT) | pgprot_val(prot);
97
98 return pmd;
99}
100
101void set_pmd_at(struct mm_struct *mm, unsigned long addr,
102 pmd_t *pmdp, pmd_t pmd)
103{
104 *pmdp = pmd;
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(swapper_pg_dir);
114#ifndef __PAGETABLE_PUD_FOLDED
115 pud_init(invalid_pud_table);
116#endif
117#ifndef __PAGETABLE_PMD_FOLDED
118 pmd_init(invalid_pmd_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}