Linux kernel mirror (for testing)
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linux
1/*
2 * Based on arch/arm/include/asm/pgalloc.h
3 *
4 * Copyright (C) 2000-2001 Russell King
5 * Copyright (C) 2012 ARM Ltd.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19#ifndef __ASM_PGALLOC_H
20#define __ASM_PGALLOC_H
21
22#include <asm/pgtable-hwdef.h>
23#include <asm/processor.h>
24#include <asm/cacheflush.h>
25#include <asm/tlbflush.h>
26
27#define check_pgt_cache() do { } while (0)
28
29#define PGALLOC_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_REPEAT | __GFP_ZERO)
30#define PGD_SIZE (PTRS_PER_PGD * sizeof(pgd_t))
31
32#if CONFIG_PGTABLE_LEVELS > 2
33
34static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
35{
36 return (pmd_t *)__get_free_page(PGALLOC_GFP);
37}
38
39static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
40{
41 BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
42 free_page((unsigned long)pmd);
43}
44
45static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
46{
47 set_pud(pud, __pud(__pa(pmd) | PMD_TYPE_TABLE));
48}
49
50#endif /* CONFIG_PGTABLE_LEVELS > 2 */
51
52#if CONFIG_PGTABLE_LEVELS > 3
53
54static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
55{
56 return (pud_t *)__get_free_page(PGALLOC_GFP);
57}
58
59static inline void pud_free(struct mm_struct *mm, pud_t *pud)
60{
61 BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
62 free_page((unsigned long)pud);
63}
64
65static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
66{
67 set_pgd(pgd, __pgd(__pa(pud) | PUD_TYPE_TABLE));
68}
69
70#endif /* CONFIG_PGTABLE_LEVELS > 3 */
71
72extern pgd_t *pgd_alloc(struct mm_struct *mm);
73extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
74
75static inline pte_t *
76pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
77{
78 return (pte_t *)__get_free_page(PGALLOC_GFP);
79}
80
81static inline pgtable_t
82pte_alloc_one(struct mm_struct *mm, unsigned long addr)
83{
84 struct page *pte;
85
86 pte = alloc_pages(PGALLOC_GFP, 0);
87 if (!pte)
88 return NULL;
89 if (!pgtable_page_ctor(pte)) {
90 __free_page(pte);
91 return NULL;
92 }
93 return pte;
94}
95
96/*
97 * Free a PTE table.
98 */
99static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
100{
101 if (pte)
102 free_page((unsigned long)pte);
103}
104
105static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
106{
107 pgtable_page_dtor(pte);
108 __free_page(pte);
109}
110
111static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte,
112 pmdval_t prot)
113{
114 set_pmd(pmdp, __pmd(pte | prot));
115}
116
117/*
118 * Populate the pmdp entry with a pointer to the pte. This pmd is part
119 * of the mm address space.
120 */
121static inline void
122pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
123{
124 /*
125 * The pmd must be loaded with the physical address of the PTE table
126 */
127 __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE);
128}
129
130static inline void
131pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
132{
133 __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE);
134}
135#define pmd_pgtable(pmd) pmd_page(pmd)
136
137#endif