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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> |
9a8fd558 CZ |
17 | |
18 | /* | |
19 | * Allocating and freeing a pmd is trivial: the 1-entry pmd is | |
20 | * inside the pgd, so has no extra memory associated with it. | |
21 | */ | |
22 | ||
6656920b CZ |
23 | #define pmd_populate_kernel(mm, pmdp, ptep) \ |
24 | (pmd_val(*(pmdp)) = ((unsigned long)ptep)) | |
25 | #define pmd_populate(mm, pmdp, page) \ | |
26 | (pmd_val(*(pmdp)) = ((unsigned long)page_to_virt(page))) | |
9a8fd558 | 27 | |
6656920b CZ |
28 | static inline pgd_t* |
29 | pgd_alloc(struct mm_struct *mm) | |
9a8fd558 | 30 | { |
6656920b | 31 | return (pgd_t*) __get_free_pages(GFP_KERNEL | __GFP_ZERO, PGD_ORDER); |
9a8fd558 CZ |
32 | } |
33 | ||
5e541973 | 34 | static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) |
9a8fd558 | 35 | { |
6656920b | 36 | free_page((unsigned long)pgd); |
9a8fd558 CZ |
37 | } |
38 | ||
6656920b | 39 | /* Use a slab cache for the pte pages (see also sparc64 implementation) */ |
9a8fd558 | 40 | |
6656920b | 41 | extern struct kmem_cache *pgtable_cache; |
9a8fd558 | 42 | |
6656920b CZ |
43 | static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, |
44 | unsigned long address) | |
9a8fd558 | 45 | { |
6656920b CZ |
46 | return kmem_cache_alloc(pgtable_cache, GFP_KERNEL|__GFP_REPEAT); |
47 | } | |
9a8fd558 | 48 | |
6656920b CZ |
49 | static inline struct page *pte_alloc_one(struct mm_struct *mm, |
50 | unsigned long addr) | |
51 | { | |
52 | return virt_to_page(pte_alloc_one_kernel(mm, addr)); | |
9a8fd558 CZ |
53 | } |
54 | ||
5e541973 | 55 | static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) |
6656920b CZ |
56 | { |
57 | kmem_cache_free(pgtable_cache, pte); | |
58 | } | |
9a8fd558 | 59 | |
5e541973 | 60 | static inline void pte_free(struct mm_struct *mm, struct page *page) |
6656920b CZ |
61 | { |
62 | kmem_cache_free(pgtable_cache, page_address(page)); | |
63 | } | |
9a8fd558 CZ |
64 | |
65 | #endif /* __KERNEL__ */ | |
66 | #endif /* _XTENSA_PGALLOC_H */ |