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Commit | Line | Data |
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d2912cb1 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
9a8fd558 | 2 | /* |
6656920b | 3 | * include/asm-xtensa/pgalloc.h |
9a8fd558 | 4 | * |
6656920b | 5 | * Copyright (C) 2001-2007 Tensilica Inc. |
9a8fd558 CZ |
6 | */ |
7 | ||
8 | #ifndef _XTENSA_PGALLOC_H | |
9 | #define _XTENSA_PGALLOC_H | |
10 | ||
9a8fd558 | 11 | #include <linux/highmem.h> |
4573e398 | 12 | #include <linux/slab.h> |
9a8fd558 CZ |
13 | |
14 | /* | |
15 | * Allocating and freeing a pmd is trivial: the 1-entry pmd is | |
16 | * inside the pgd, so has no extra memory associated with it. | |
17 | */ | |
18 | ||
6656920b CZ |
19 | #define pmd_populate_kernel(mm, pmdp, ptep) \ |
20 | (pmd_val(*(pmdp)) = ((unsigned long)ptep)) | |
21 | #define pmd_populate(mm, pmdp, page) \ | |
22 | (pmd_val(*(pmdp)) = ((unsigned long)page_to_virt(page))) | |
2f569afd | 23 | #define pmd_pgtable(pmd) pmd_page(pmd) |
9a8fd558 | 24 | |
6656920b CZ |
25 | static inline pgd_t* |
26 | pgd_alloc(struct mm_struct *mm) | |
9a8fd558 | 27 | { |
6656920b | 28 | return (pgd_t*) __get_free_pages(GFP_KERNEL | __GFP_ZERO, PGD_ORDER); |
9a8fd558 CZ |
29 | } |
30 | ||
5e541973 | 31 | static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) |
9a8fd558 | 32 | { |
6656920b | 33 | free_page((unsigned long)pgd); |
9a8fd558 CZ |
34 | } |
35 | ||
4cf58924 | 36 | static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm) |
9a8fd558 | 37 | { |
f820e280 KS |
38 | pte_t *ptep; |
39 | int i; | |
40 | ||
32d6bd90 | 41 | ptep = (pte_t *)__get_free_page(GFP_KERNEL); |
f820e280 KS |
42 | if (!ptep) |
43 | return NULL; | |
44 | for (i = 0; i < 1024; i++) | |
45 | pte_clear(NULL, 0, ptep + i); | |
46 | return ptep; | |
6656920b | 47 | } |
9a8fd558 | 48 | |
4cf58924 | 49 | static inline pgtable_t pte_alloc_one(struct mm_struct *mm) |
6656920b | 50 | { |
f8c6d30b | 51 | pte_t *pte; |
2f569afd MS |
52 | struct page *page; |
53 | ||
4cf58924 | 54 | pte = pte_alloc_one_kernel(mm); |
f8c6d30b KS |
55 | if (!pte) |
56 | return NULL; | |
57 | page = virt_to_page(pte); | |
8f43123d | 58 | if (!pgtable_page_ctor(page)) { |
f820e280 | 59 | __free_page(page); |
8f43123d KS |
60 | return NULL; |
61 | } | |
2f569afd | 62 | return page; |
9a8fd558 CZ |
63 | } |
64 | ||
5e541973 | 65 | static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) |
6656920b | 66 | { |
f820e280 | 67 | free_page((unsigned long)pte); |
6656920b | 68 | } |
9a8fd558 | 69 | |
2f569afd | 70 | static inline void pte_free(struct mm_struct *mm, pgtable_t pte) |
6656920b | 71 | { |
2f569afd | 72 | pgtable_page_dtor(pte); |
f820e280 | 73 | __free_page(pte); |
6656920b | 74 | } |
2f569afd | 75 | #define pmd_pgtable(pmd) pmd_page(pmd) |
9a8fd558 | 76 | |
9a8fd558 | 77 | #endif /* _XTENSA_PGALLOC_H */ |