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#ifndef CONFIG_ARM64_64K_PAGES
30
31static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
32{
33 return (pmd_t *)get_zeroed_page(GFP_KERNEL | __GFP_REPEAT);
34}
35
36static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
37{
38 BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
39 free_page((unsigned long)pmd);
40}
41
42static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
43{
44 set_pud(pud, __pud(__pa(pmd) | PMD_TYPE_TABLE));
45}
46
47#endif /* CONFIG_ARM64_64K_PAGES */
48
49extern pgd_t *pgd_alloc(struct mm_struct *mm);
50extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
51
52#define PGALLOC_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_REPEAT | __GFP_ZERO)
53
54static inline pte_t *
55pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
56{
57 return (pte_t *)__get_free_page(PGALLOC_GFP);
58}
59
60static inline pgtable_t
61pte_alloc_one(struct mm_struct *mm, unsigned long addr)
62{
63 struct page *pte;
64
65 pte = alloc_pages(PGALLOC_GFP, 0);
66 if (!pte)
67 return NULL;
68 if (!pgtable_page_ctor(pte)) {
69 __free_page(pte);
70 return NULL;
71 }
72 return pte;
73}
74
75/*
76 * Free a PTE table.
77 */
78static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
79{
80 if (pte)
81 free_page((unsigned long)pte);
82}
83
84static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
85{
86 pgtable_page_dtor(pte);
87 __free_page(pte);
88}
89
90static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte,
91 pmdval_t prot)
92{
93 set_pmd(pmdp, __pmd(pte | prot));
94}
95
96/*
97 * Populate the pmdp entry with a pointer to the pte. This pmd is part
98 * of the mm address space.
99 */
100static inline void
101pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
102{
103 /*
104 * The pmd must be loaded with the physical address of the PTE table
105 */
106 __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE);
107}
108
109static inline void
110pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
111{
112 __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE);
113}
114#define pmd_pgtable(pmd) pmd_page(pmd)
115
116#endif