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1da177e4 LT |
1 | /* |
2 | * linux/include/asm-arm/pgalloc.h | |
3 | * | |
4 | * Copyright (C) 2000-2001 Russell King | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | #ifndef _ASMARM_PGALLOC_H | |
11 | #define _ASMARM_PGALLOC_H | |
12 | ||
13 | #include <asm/processor.h> | |
14 | #include <asm/cacheflush.h> | |
15 | #include <asm/tlbflush.h> | |
16 | ||
17 | /* | |
18 | * Since we have only two-level page tables, these are trivial | |
19 | */ | |
20 | #define pmd_alloc_one(mm,addr) ({ BUG(); ((pmd_t *)2); }) | |
21 | #define pmd_free(pmd) do { } while (0) | |
22 | #define pgd_populate(mm,pmd,pte) BUG() | |
23 | ||
24 | extern pgd_t *get_pgd_slow(struct mm_struct *mm); | |
25 | extern void free_pgd_slow(pgd_t *pgd); | |
26 | ||
27 | #define pgd_alloc(mm) get_pgd_slow(mm) | |
28 | #define pgd_free(pgd) free_pgd_slow(pgd) | |
29 | ||
30 | #define check_pgt_cache() do { } while (0) | |
31 | ||
32 | /* | |
33 | * Allocate one PTE table. | |
34 | * | |
35 | * This actually allocates two hardware PTE tables, but we wrap this up | |
36 | * into one table thus: | |
37 | * | |
38 | * +------------+ | |
39 | * | h/w pt 0 | | |
40 | * +------------+ | |
41 | * | h/w pt 1 | | |
42 | * +------------+ | |
43 | * | Linux pt 0 | | |
44 | * +------------+ | |
45 | * | Linux pt 1 | | |
46 | * +------------+ | |
47 | */ | |
48 | static inline pte_t * | |
49 | pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr) | |
50 | { | |
51 | pte_t *pte; | |
52 | ||
53 | pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO); | |
54 | if (pte) { | |
55 | clean_dcache_area(pte, sizeof(pte_t) * PTRS_PER_PTE); | |
56 | pte += PTRS_PER_PTE; | |
57 | } | |
58 | ||
59 | return pte; | |
60 | } | |
61 | ||
62 | static inline struct page * | |
63 | pte_alloc_one(struct mm_struct *mm, unsigned long addr) | |
64 | { | |
65 | struct page *pte; | |
66 | ||
67 | pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0); | |
68 | if (pte) { | |
69 | void *page = page_address(pte); | |
70 | clean_dcache_area(page, sizeof(pte_t) * PTRS_PER_PTE); | |
71 | } | |
72 | ||
73 | return pte; | |
74 | } | |
75 | ||
76 | /* | |
77 | * Free one PTE table. | |
78 | */ | |
79 | static inline void pte_free_kernel(pte_t *pte) | |
80 | { | |
81 | if (pte) { | |
82 | pte -= PTRS_PER_PTE; | |
83 | free_page((unsigned long)pte); | |
84 | } | |
85 | } | |
86 | ||
87 | static inline void pte_free(struct page *pte) | |
88 | { | |
89 | __free_page(pte); | |
90 | } | |
91 | ||
bdf04248 RK |
92 | static inline void __pmd_populate(pmd_t *pmdp, unsigned long pmdval) |
93 | { | |
94 | pmdp[0] = __pmd(pmdval); | |
95 | pmdp[1] = __pmd(pmdval + 256 * sizeof(pte_t)); | |
96 | flush_pmd_entry(pmdp); | |
97 | } | |
98 | ||
1da177e4 LT |
99 | /* |
100 | * Populate the pmdp entry with a pointer to the pte. This pmd is part | |
101 | * of the mm address space. | |
102 | * | |
103 | * Ensure that we always set both PMD entries. | |
104 | */ | |
105 | static inline void | |
106 | pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep) | |
107 | { | |
108 | unsigned long pte_ptr = (unsigned long)ptep; | |
1da177e4 LT |
109 | |
110 | /* | |
111 | * The pmd must be loaded with the physical | |
112 | * address of the PTE table | |
113 | */ | |
114 | pte_ptr -= PTRS_PER_PTE * sizeof(void *); | |
bdf04248 | 115 | __pmd_populate(pmdp, __pa(pte_ptr) | _PAGE_KERNEL_TABLE); |
1da177e4 LT |
116 | } |
117 | ||
118 | static inline void | |
119 | pmd_populate(struct mm_struct *mm, pmd_t *pmdp, struct page *ptep) | |
120 | { | |
bdf04248 | 121 | __pmd_populate(pmdp, page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE); |
1da177e4 LT |
122 | } |
123 | ||
124 | #endif |