Commit | Line | Data |
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9a8fd558 | 1 | /* |
6656920b | 2 | * include/asm-xtensa/pgalloc.h |
9a8fd558 CZ |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
6656920b | 8 | * Copyright (C) 2001-2007 Tensilica Inc. |
9a8fd558 CZ |
9 | */ |
10 | ||
11 | #ifndef _XTENSA_PGALLOC_H | |
12 | #define _XTENSA_PGALLOC_H | |
13 | ||
14 | #ifdef __KERNEL__ | |
15 | ||
9a8fd558 | 16 | #include <linux/highmem.h> |
4573e398 | 17 | #include <linux/slab.h> |
9a8fd558 CZ |
18 | |
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 | ||
5e541973 | 36 | static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) |
9a8fd558 | 37 | { |
6656920b | 38 | free_page((unsigned long)pgd); |
9a8fd558 CZ |
39 | } |
40 | ||
c4c4594b | 41 | static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, |
6656920b | 42 | unsigned long address) |
9a8fd558 | 43 | { |
f820e280 KS |
44 | pte_t *ptep; |
45 | int i; | |
46 | ||
32d6bd90 | 47 | ptep = (pte_t *)__get_free_page(GFP_KERNEL); |
f820e280 KS |
48 | if (!ptep) |
49 | return NULL; | |
50 | for (i = 0; i < 1024; i++) | |
51 | pte_clear(NULL, 0, ptep + i); | |
52 | return ptep; | |
6656920b | 53 | } |
9a8fd558 | 54 | |
e584d85f | 55 | static inline pgtable_t pte_alloc_one(struct mm_struct *mm, |
2f569afd | 56 | unsigned long addr) |
6656920b | 57 | { |
f8c6d30b | 58 | pte_t *pte; |
2f569afd MS |
59 | struct page *page; |
60 | ||
f8c6d30b KS |
61 | pte = pte_alloc_one_kernel(mm, addr); |
62 | if (!pte) | |
63 | return NULL; | |
64 | page = virt_to_page(pte); | |
8f43123d | 65 | if (!pgtable_page_ctor(page)) { |
f820e280 | 66 | __free_page(page); |
8f43123d KS |
67 | return NULL; |
68 | } | |
2f569afd | 69 | return page; |
9a8fd558 CZ |
70 | } |
71 | ||
5e541973 | 72 | static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) |
6656920b | 73 | { |
f820e280 | 74 | free_page((unsigned long)pte); |
6656920b | 75 | } |
9a8fd558 | 76 | |
2f569afd | 77 | static inline void pte_free(struct mm_struct *mm, pgtable_t pte) |
6656920b | 78 | { |
2f569afd | 79 | pgtable_page_dtor(pte); |
f820e280 | 80 | __free_page(pte); |
6656920b | 81 | } |
2f569afd | 82 | #define pmd_pgtable(pmd) pmd_page(pmd) |
9a8fd558 CZ |
83 | |
84 | #endif /* __KERNEL__ */ | |
85 | #endif /* _XTENSA_PGALLOC_H */ |