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 | ||
7278914c | 11 | #ifdef CONFIG_MMU |
9a8fd558 | 12 | #include <linux/highmem.h> |
4573e398 | 13 | #include <linux/slab.h> |
9a8fd558 | 14 | |
7278914c MR |
15 | #define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL |
16 | #define __HAVE_ARCH_PTE_ALLOC_ONE | |
17 | #include <asm-generic/pgalloc.h> | |
18 | ||
9a8fd558 CZ |
19 | /* |
20 | * Allocating and freeing a pmd is trivial: the 1-entry pmd is | |
21 | * inside the pgd, so has no extra memory associated with it. | |
22 | */ | |
23 | ||
6656920b CZ |
24 | #define pmd_populate_kernel(mm, pmdp, ptep) \ |
25 | (pmd_val(*(pmdp)) = ((unsigned long)ptep)) | |
26 | #define pmd_populate(mm, pmdp, page) \ | |
27 | (pmd_val(*(pmdp)) = ((unsigned long)page_to_virt(page))) | |
2f569afd | 28 | #define pmd_pgtable(pmd) pmd_page(pmd) |
9a8fd558 | 29 | |
6656920b CZ |
30 | static inline pgd_t* |
31 | pgd_alloc(struct mm_struct *mm) | |
9a8fd558 | 32 | { |
6656920b | 33 | return (pgd_t*) __get_free_pages(GFP_KERNEL | __GFP_ZERO, PGD_ORDER); |
9a8fd558 CZ |
34 | } |
35 | ||
7278914c MR |
36 | static inline void ptes_clear(pte_t *ptep) |
37 | { | |
38 | int i; | |
39 | ||
40 | for (i = 0; i < PTRS_PER_PTE; i++) | |
41 | pte_clear(NULL, 0, ptep + i); | |
42 | } | |
43 | ||
4cf58924 | 44 | static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm) |
9a8fd558 | 45 | { |
f820e280 | 46 | pte_t *ptep; |
f820e280 | 47 | |
7278914c | 48 | ptep = (pte_t *)__pte_alloc_one_kernel(mm); |
f820e280 KS |
49 | if (!ptep) |
50 | return NULL; | |
7278914c | 51 | ptes_clear(ptep); |
f820e280 | 52 | return ptep; |
6656920b | 53 | } |
9a8fd558 | 54 | |
4cf58924 | 55 | static inline pgtable_t pte_alloc_one(struct mm_struct *mm) |
6656920b | 56 | { |
2f569afd MS |
57 | struct page *page; |
58 | ||
7278914c MR |
59 | page = __pte_alloc_one(mm, GFP_PGTABLE_USER); |
60 | if (!page) | |
8f43123d | 61 | return NULL; |
7278914c | 62 | ptes_clear(page_address(page)); |
2f569afd | 63 | return page; |
9a8fd558 CZ |
64 | } |
65 | ||
2f569afd | 66 | #define pmd_pgtable(pmd) pmd_page(pmd) |
7278914c | 67 | #endif /* CONFIG_MMU */ |
9a8fd558 | 68 | |
9a8fd558 | 69 | #endif /* _XTENSA_PGALLOC_H */ |