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1da177e4 LT |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (C) 1994 - 2001, 2003 by Ralf Baechle | |
7 | * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc. | |
8 | */ | |
9 | #ifndef _ASM_PGALLOC_H | |
10 | #define _ASM_PGALLOC_H | |
11 | ||
1da177e4 LT |
12 | #include <linux/highmem.h> |
13 | #include <linux/mm.h> | |
14 | ||
15 | static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, | |
16 | pte_t *pte) | |
17 | { | |
18 | set_pmd(pmd, __pmd((unsigned long)pte)); | |
19 | } | |
20 | ||
21 | static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, | |
22 | struct page *pte) | |
23 | { | |
24 | set_pmd(pmd, __pmd((unsigned long)page_address(pte))); | |
25 | } | |
26 | ||
c6e8b587 RB |
27 | /* |
28 | * Initialize a new pmd table with invalid pointers. | |
29 | */ | |
30 | extern void pmd_init(unsigned long page, unsigned long pagetable); | |
31 | ||
32 | #ifdef CONFIG_64BIT | |
33 | ||
34 | static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) | |
35 | { | |
36 | set_pud(pud, __pud((unsigned long)pmd)); | |
37 | } | |
38 | #endif | |
39 | ||
1da177e4 LT |
40 | /* |
41 | * Initialize a new pgd / pmd table with invalid pointers. | |
42 | */ | |
43 | extern void pgd_init(unsigned long page); | |
1da177e4 LT |
44 | |
45 | static inline pgd_t *pgd_alloc(struct mm_struct *mm) | |
46 | { | |
47 | pgd_t *ret, *init; | |
48 | ||
49 | ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER); | |
50 | if (ret) { | |
242954b5 | 51 | init = pgd_offset(&init_mm, 0UL); |
1da177e4 LT |
52 | pgd_init((unsigned long)ret); |
53 | memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD, | |
54 | (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); | |
55 | } | |
56 | ||
57 | return ret; | |
58 | } | |
59 | ||
60 | static inline void pgd_free(pgd_t *pgd) | |
61 | { | |
62 | free_pages((unsigned long)pgd, PGD_ORDER); | |
63 | } | |
64 | ||
65 | static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, | |
66 | unsigned long address) | |
67 | { | |
68 | pte_t *pte; | |
69 | ||
70 | pte = (pte_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, PTE_ORDER); | |
71 | ||
72 | return pte; | |
73 | } | |
74 | ||
75 | static inline struct page *pte_alloc_one(struct mm_struct *mm, | |
76 | unsigned long address) | |
77 | { | |
78 | struct page *pte; | |
79 | ||
80 | pte = alloc_pages(GFP_KERNEL | __GFP_REPEAT, PTE_ORDER); | |
81 | if (pte) | |
82 | clear_highpage(pte); | |
83 | ||
84 | return pte; | |
85 | } | |
86 | ||
87 | static inline void pte_free_kernel(pte_t *pte) | |
88 | { | |
89 | free_pages((unsigned long)pte, PTE_ORDER); | |
90 | } | |
91 | ||
92 | static inline void pte_free(struct page *pte) | |
93 | { | |
94 | __free_pages(pte, PTE_ORDER); | |
95 | } | |
96 | ||
97 | #define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte)) | |
98 | ||
875d43e7 | 99 | #ifdef CONFIG_32BIT |
1da177e4 LT |
100 | |
101 | /* | |
102 | * allocating and freeing a pmd is trivial: the 1-entry pmd is | |
103 | * inside the pgd, so has no extra memory associated with it. | |
104 | */ | |
1da177e4 LT |
105 | #define pmd_free(x) do { } while (0) |
106 | #define __pmd_free_tlb(tlb,x) do { } while (0) | |
c6e8b587 | 107 | |
1da177e4 LT |
108 | #endif |
109 | ||
875d43e7 | 110 | #ifdef CONFIG_64BIT |
1da177e4 | 111 | |
1da177e4 LT |
112 | static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address) |
113 | { | |
114 | pmd_t *pmd; | |
115 | ||
116 | pmd = (pmd_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT, PMD_ORDER); | |
117 | if (pmd) | |
118 | pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table); | |
119 | return pmd; | |
120 | } | |
121 | ||
122 | static inline void pmd_free(pmd_t *pmd) | |
123 | { | |
124 | free_pages((unsigned long)pmd, PMD_ORDER); | |
125 | } | |
126 | ||
127 | #define __pmd_free_tlb(tlb,x) pmd_free(x) | |
128 | ||
129 | #endif | |
130 | ||
131 | #define check_pgt_cache() do { } while (0) | |
132 | ||
6a1e5529 AN |
133 | extern void pagetable_init(void); |
134 | ||
1da177e4 | 135 | #endif /* _ASM_PGALLOC_H */ |