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_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(pud_t *pud, phys_addr_t pmd, pudval_t prot)
46{
47 set_pud(pud, __pud(pmd | prot));
48}
49
50static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
51{
52 __pud_populate(pud, __pa(pmd), PMD_TYPE_TABLE);
53}
54#else
55static inline void __pud_populate(pud_t *pud, phys_addr_t pmd, pudval_t prot)
56{
57 BUILD_BUG();
58}
59#endif /* CONFIG_PGTABLE_LEVELS > 2 */
60
61#if CONFIG_PGTABLE_LEVELS > 3
62
63static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
64{
65 return (pud_t *)__get_free_page(PGALLOC_GFP);
66}
67
68static inline void pud_free(struct mm_struct *mm, pud_t *pud)
69{
70 BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
71 free_page((unsigned long)pud);
72}
73
74static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pud, pgdval_t prot)
75{
76 set_pgd(pgdp, __pgd(pud | prot));
77}
78
79static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
80{
81 __pgd_populate(pgd, __pa(pud), PUD_TYPE_TABLE);
82}
83#else
84static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pud, pgdval_t prot)
85{
86 BUILD_BUG();
87}
88#endif /* CONFIG_PGTABLE_LEVELS > 3 */
89
90extern pgd_t *pgd_alloc(struct mm_struct *mm);
91extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
92
93static inline pte_t *
94pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
95{
96 return (pte_t *)__get_free_page(PGALLOC_GFP);
97}
98
99static inline pgtable_t
100pte_alloc_one(struct mm_struct *mm, unsigned long addr)
101{
102 struct page *pte;
103
104 pte = alloc_pages(PGALLOC_GFP, 0);
105 if (!pte)
106 return NULL;
107 if (!pgtable_page_ctor(pte)) {
108 __free_page(pte);
109 return NULL;
110 }
111 return pte;
112}
113
114/*
115 * Free a PTE table.
116 */
117static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
118{
119 if (pte)
120 free_page((unsigned long)pte);
121}
122
123static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
124{
125 pgtable_page_dtor(pte);
126 __free_page(pte);
127}
128
129static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte,
130 pmdval_t prot)
131{
132 set_pmd(pmdp, __pmd(pte | prot));
133}
134
135/*
136 * Populate the pmdp entry with a pointer to the pte. This pmd is part
137 * of the mm address space.
138 */
139static inline void
140pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
141{
142 /*
143 * The pmd must be loaded with the physical address of the PTE table
144 */
145 __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE);
146}
147
148static inline void
149pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
150{
151 __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE);
152}
153#define pmd_pgtable(pmd) pmd_page(pmd)
154
155#endif