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caab277b | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
1d18c47c CM |
2 | /* |
3 | * Based on arch/arm/include/asm/pgalloc.h | |
4 | * | |
5 | * Copyright (C) 2000-2001 Russell King | |
6 | * Copyright (C) 2012 ARM Ltd. | |
1d18c47c CM |
7 | */ |
8 | #ifndef __ASM_PGALLOC_H | |
9 | #define __ASM_PGALLOC_H | |
10 | ||
11 | #include <asm/pgtable-hwdef.h> | |
12 | #include <asm/processor.h> | |
13 | #include <asm/cacheflush.h> | |
14 | #include <asm/tlbflush.h> | |
15 | ||
16 | #define check_pgt_cache() do { } while (0) | |
17 | ||
75f296d9 | 18 | #define PGALLOC_GFP (GFP_KERNEL | __GFP_ZERO) |
fd2203dd | 19 | #define PGD_SIZE (PTRS_PER_PGD * sizeof(pgd_t)) |
15670ef1 | 20 | |
9f25e6ad | 21 | #if CONFIG_PGTABLE_LEVELS > 2 |
1d18c47c CM |
22 | |
23 | static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr) | |
24 | { | |
54c8d911 YZ |
25 | struct page *page; |
26 | ||
27 | page = alloc_page(PGALLOC_GFP); | |
28 | if (!page) | |
29 | return NULL; | |
30 | if (!pgtable_pmd_page_ctor(page)) { | |
31 | __free_page(page); | |
32 | return NULL; | |
33 | } | |
34 | return page_address(page); | |
1d18c47c CM |
35 | } |
36 | ||
20a004e7 | 37 | static inline void pmd_free(struct mm_struct *mm, pmd_t *pmdp) |
1d18c47c | 38 | { |
20a004e7 | 39 | BUG_ON((unsigned long)pmdp & (PAGE_SIZE-1)); |
54c8d911 | 40 | pgtable_pmd_page_dtor(virt_to_page(pmdp)); |
20a004e7 | 41 | free_page((unsigned long)pmdp); |
1d18c47c CM |
42 | } |
43 | ||
20a004e7 | 44 | static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot) |
1d18c47c | 45 | { |
20a004e7 | 46 | set_pud(pudp, __pud(__phys_to_pud_val(pmdp) | prot)); |
1d18c47c CM |
47 | } |
48 | ||
20a004e7 | 49 | static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp) |
1e531cce | 50 | { |
20a004e7 | 51 | __pud_populate(pudp, __pa(pmdp), PMD_TYPE_TABLE); |
1e531cce MR |
52 | } |
53 | #else | |
20a004e7 | 54 | static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot) |
1e531cce MR |
55 | { |
56 | BUILD_BUG(); | |
57 | } | |
9f25e6ad | 58 | #endif /* CONFIG_PGTABLE_LEVELS > 2 */ |
1d18c47c | 59 | |
9f25e6ad | 60 | #if CONFIG_PGTABLE_LEVELS > 3 |
c79b954b JL |
61 | |
62 | static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) | |
63 | { | |
15670ef1 | 64 | return (pud_t *)__get_free_page(PGALLOC_GFP); |
c79b954b JL |
65 | } |
66 | ||
20a004e7 | 67 | static inline void pud_free(struct mm_struct *mm, pud_t *pudp) |
c79b954b | 68 | { |
20a004e7 WD |
69 | BUG_ON((unsigned long)pudp & (PAGE_SIZE-1)); |
70 | free_page((unsigned long)pudp); | |
c79b954b JL |
71 | } |
72 | ||
20a004e7 | 73 | static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pudp, pgdval_t prot) |
c79b954b | 74 | { |
20a004e7 | 75 | set_pgd(pgdp, __pgd(__phys_to_pgd_val(pudp) | prot)); |
c79b954b JL |
76 | } |
77 | ||
20a004e7 | 78 | static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgdp, pud_t *pudp) |
1e531cce | 79 | { |
20a004e7 | 80 | __pgd_populate(pgdp, __pa(pudp), PUD_TYPE_TABLE); |
1e531cce MR |
81 | } |
82 | #else | |
20a004e7 | 83 | static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pudp, pgdval_t prot) |
1e531cce MR |
84 | { |
85 | BUILD_BUG(); | |
86 | } | |
9f25e6ad | 87 | #endif /* CONFIG_PGTABLE_LEVELS > 3 */ |
c79b954b | 88 | |
1d18c47c | 89 | extern pgd_t *pgd_alloc(struct mm_struct *mm); |
20a004e7 | 90 | extern void pgd_free(struct mm_struct *mm, pgd_t *pgdp); |
1d18c47c | 91 | |
1d18c47c | 92 | static inline pte_t * |
4cf58924 | 93 | pte_alloc_one_kernel(struct mm_struct *mm) |
1d18c47c CM |
94 | { |
95 | return (pte_t *)__get_free_page(PGALLOC_GFP); | |
96 | } | |
97 | ||
98 | static inline pgtable_t | |
4cf58924 | 99 | pte_alloc_one(struct mm_struct *mm) |
1d18c47c CM |
100 | { |
101 | struct page *pte; | |
102 | ||
103 | pte = alloc_pages(PGALLOC_GFP, 0); | |
d97a2291 KS |
104 | if (!pte) |
105 | return NULL; | |
106 | if (!pgtable_page_ctor(pte)) { | |
107 | __free_page(pte); | |
108 | return NULL; | |
109 | } | |
1d18c47c CM |
110 | return pte; |
111 | } | |
112 | ||
113 | /* | |
114 | * Free a PTE table. | |
115 | */ | |
20a004e7 | 116 | static inline void pte_free_kernel(struct mm_struct *mm, pte_t *ptep) |
1d18c47c | 117 | { |
20a004e7 WD |
118 | if (ptep) |
119 | free_page((unsigned long)ptep); | |
1d18c47c CM |
120 | } |
121 | ||
122 | static inline void pte_free(struct mm_struct *mm, pgtable_t pte) | |
123 | { | |
124 | pgtable_page_dtor(pte); | |
125 | __free_page(pte); | |
126 | } | |
127 | ||
20a004e7 | 128 | static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t ptep, |
1d18c47c CM |
129 | pmdval_t prot) |
130 | { | |
20a004e7 | 131 | set_pmd(pmdp, __pmd(__phys_to_pmd_val(ptep) | prot)); |
1d18c47c CM |
132 | } |
133 | ||
134 | /* | |
135 | * Populate the pmdp entry with a pointer to the pte. This pmd is part | |
136 | * of the mm address space. | |
137 | */ | |
138 | static inline void | |
139 | pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep) | |
140 | { | |
141 | /* | |
142 | * The pmd must be loaded with the physical address of the PTE table | |
143 | */ | |
144 | __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE); | |
145 | } | |
146 | ||
147 | static inline void | |
148 | pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep) | |
149 | { | |
150 | __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE); | |
151 | } | |
152 | #define pmd_pgtable(pmd) pmd_page(pmd) | |
153 | ||
154 | #endif |