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1d18c47c CM |
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 | ||
f3610a6a | 29 | #define PGALLOC_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO) |
fd2203dd | 30 | #define PGD_SIZE (PTRS_PER_PGD * sizeof(pgd_t)) |
15670ef1 | 31 | |
9f25e6ad | 32 | #if CONFIG_PGTABLE_LEVELS > 2 |
1d18c47c CM |
33 | |
34 | static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr) | |
35 | { | |
15670ef1 | 36 | return (pmd_t *)__get_free_page(PGALLOC_GFP); |
1d18c47c CM |
37 | } |
38 | ||
39 | static 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 | ||
1e531cce | 45 | static inline void __pud_populate(pud_t *pud, phys_addr_t pmd, pudval_t prot) |
1d18c47c | 46 | { |
1e531cce | 47 | set_pud(pud, __pud(pmd | prot)); |
1d18c47c CM |
48 | } |
49 | ||
1e531cce MR |
50 | static 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 | |
55 | static inline void __pud_populate(pud_t *pud, phys_addr_t pmd, pudval_t prot) | |
56 | { | |
57 | BUILD_BUG(); | |
58 | } | |
9f25e6ad | 59 | #endif /* CONFIG_PGTABLE_LEVELS > 2 */ |
1d18c47c | 60 | |
9f25e6ad | 61 | #if CONFIG_PGTABLE_LEVELS > 3 |
c79b954b JL |
62 | |
63 | static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) | |
64 | { | |
15670ef1 | 65 | return (pud_t *)__get_free_page(PGALLOC_GFP); |
c79b954b JL |
66 | } |
67 | ||
68 | static 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 | ||
1e531cce | 74 | static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pud, pgdval_t prot) |
c79b954b | 75 | { |
1e531cce | 76 | set_pgd(pgdp, __pgd(pud | prot)); |
c79b954b JL |
77 | } |
78 | ||
1e531cce MR |
79 | static 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 | |
84 | static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pud, pgdval_t prot) | |
85 | { | |
86 | BUILD_BUG(); | |
87 | } | |
9f25e6ad | 88 | #endif /* CONFIG_PGTABLE_LEVELS > 3 */ |
c79b954b | 89 | |
1d18c47c CM |
90 | extern pgd_t *pgd_alloc(struct mm_struct *mm); |
91 | extern void pgd_free(struct mm_struct *mm, pgd_t *pgd); | |
92 | ||
1d18c47c CM |
93 | static inline pte_t * |
94 | pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr) | |
95 | { | |
96 | return (pte_t *)__get_free_page(PGALLOC_GFP); | |
97 | } | |
98 | ||
99 | static inline pgtable_t | |
100 | pte_alloc_one(struct mm_struct *mm, unsigned long addr) | |
101 | { | |
102 | struct page *pte; | |
103 | ||
104 | pte = alloc_pages(PGALLOC_GFP, 0); | |
d97a2291 KS |
105 | if (!pte) |
106 | return NULL; | |
107 | if (!pgtable_page_ctor(pte)) { | |
108 | __free_page(pte); | |
109 | return NULL; | |
110 | } | |
1d18c47c CM |
111 | return pte; |
112 | } | |
113 | ||
114 | /* | |
115 | * Free a PTE table. | |
116 | */ | |
117 | static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) | |
118 | { | |
119 | if (pte) | |
120 | free_page((unsigned long)pte); | |
121 | } | |
122 | ||
123 | static inline void pte_free(struct mm_struct *mm, pgtable_t pte) | |
124 | { | |
125 | pgtable_page_dtor(pte); | |
126 | __free_page(pte); | |
127 | } | |
128 | ||
129 | static 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 | */ | |
139 | static inline void | |
140 | pmd_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 | ||
148 | static inline void | |
149 | pmd_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 |