Linux kernel mirror (for testing)
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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) 1994 - 2001, 2003 by Ralf Baechle
7 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
8 */
9#ifndef _ASM_PGALLOC_H
10#define _ASM_PGALLOC_H
11
12#include <linux/highmem.h>
13#include <linux/mm.h>
14#include <linux/sched.h>
15
16static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
17 pte_t *pte)
18{
19 set_pmd(pmd, __pmd((unsigned long)pte));
20}
21
22static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
23 pgtable_t pte)
24{
25 set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
26}
27#define pmd_pgtable(pmd) pmd_page(pmd)
28
29/*
30 * Initialize a new pmd table with invalid pointers.
31 */
32extern void pmd_init(unsigned long page, unsigned long pagetable);
33
34#ifndef __PAGETABLE_PMD_FOLDED
35
36static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
37{
38 set_pud(pud, __pud((unsigned long)pmd));
39}
40#endif
41
42/*
43 * Initialize a new pgd / pmd table with invalid pointers.
44 */
45extern void pgd_init(unsigned long page);
46extern pgd_t *pgd_alloc(struct mm_struct *mm);
47
48static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
49{
50 free_pages((unsigned long)pgd, PGD_ORDER);
51}
52
53static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
54 unsigned long address)
55{
56 return (pte_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, PTE_ORDER);
57}
58
59static inline struct page *pte_alloc_one(struct mm_struct *mm,
60 unsigned long address)
61{
62 struct page *pte;
63
64 pte = alloc_pages(GFP_KERNEL, PTE_ORDER);
65 if (!pte)
66 return NULL;
67 clear_highpage(pte);
68 if (!pgtable_page_ctor(pte)) {
69 __free_page(pte);
70 return NULL;
71 }
72 return pte;
73}
74
75static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
76{
77 free_pages((unsigned long)pte, PTE_ORDER);
78}
79
80static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
81{
82 pgtable_page_dtor(pte);
83 __free_pages(pte, PTE_ORDER);
84}
85
86#define __pte_free_tlb(tlb,pte,address) \
87do { \
88 pgtable_page_dtor(pte); \
89 tlb_remove_page((tlb), pte); \
90} while (0)
91
92#ifndef __PAGETABLE_PMD_FOLDED
93
94static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
95{
96 pmd_t *pmd;
97
98 pmd = (pmd_t *) __get_free_pages(GFP_KERNEL, PMD_ORDER);
99 if (pmd)
100 pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table);
101 return pmd;
102}
103
104static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
105{
106 free_pages((unsigned long)pmd, PMD_ORDER);
107}
108
109#define __pmd_free_tlb(tlb, x, addr) pmd_free((tlb)->mm, x)
110
111#endif
112
113#ifndef __PAGETABLE_PUD_FOLDED
114
115static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
116{
117 pud_t *pud;
118
119 pud = (pud_t *) __get_free_pages(GFP_KERNEL, PUD_ORDER);
120 if (pud)
121 pud_init((unsigned long)pud, (unsigned long)invalid_pmd_table);
122 return pud;
123}
124
125static inline void pud_free(struct mm_struct *mm, pud_t *pud)
126{
127 free_pages((unsigned long)pud, PUD_ORDER);
128}
129
130static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
131{
132 set_pgd(pgd, __pgd((unsigned long)pud));
133}
134
135#define __pud_free_tlb(tlb, x, addr) pud_free((tlb)->mm, x)
136
137#endif /* __PAGETABLE_PUD_FOLDED */
138
139#define check_pgt_cache() do { } while (0)
140
141extern void pagetable_init(void);
142
143#endif /* _ASM_PGALLOC_H */