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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 | ||
74945c86 RK |
13 | #include <asm/domain.h> |
14 | #include <asm/pgtable-hwdef.h> | |
1da177e4 LT |
15 | #include <asm/processor.h> |
16 | #include <asm/cacheflush.h> | |
17 | #include <asm/tlbflush.h> | |
18 | ||
002547b4 RK |
19 | #define check_pgt_cache() do { } while (0) |
20 | ||
21 | #ifdef CONFIG_MMU | |
22 | ||
74945c86 RK |
23 | #define _PAGE_USER_TABLE (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_USER)) |
24 | #define _PAGE_KERNEL_TABLE (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_KERNEL)) | |
25 | ||
1da177e4 LT |
26 | /* |
27 | * Since we have only two-level page tables, these are trivial | |
28 | */ | |
29 | #define pmd_alloc_one(mm,addr) ({ BUG(); ((pmd_t *)2); }) | |
5e541973 | 30 | #define pmd_free(mm, pmd) do { } while (0) |
1da177e4 LT |
31 | #define pgd_populate(mm,pmd,pte) BUG() |
32 | ||
33 | extern pgd_t *get_pgd_slow(struct mm_struct *mm); | |
5e541973 | 34 | extern void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd); |
1da177e4 LT |
35 | |
36 | #define pgd_alloc(mm) get_pgd_slow(mm) | |
5e541973 | 37 | #define pgd_free(mm, pgd) free_pgd_slow(mm, pgd) |
1da177e4 | 38 | |
1da177e4 LT |
39 | /* |
40 | * Allocate one PTE table. | |
41 | * | |
42 | * This actually allocates two hardware PTE tables, but we wrap this up | |
43 | * into one table thus: | |
44 | * | |
45 | * +------------+ | |
46 | * | h/w pt 0 | | |
47 | * +------------+ | |
48 | * | h/w pt 1 | | |
49 | * +------------+ | |
50 | * | Linux pt 0 | | |
51 | * +------------+ | |
52 | * | Linux pt 1 | | |
53 | * +------------+ | |
54 | */ | |
55 | static inline pte_t * | |
56 | pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr) | |
57 | { | |
58 | pte_t *pte; | |
59 | ||
60 | pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO); | |
61 | if (pte) { | |
62 | clean_dcache_area(pte, sizeof(pte_t) * PTRS_PER_PTE); | |
63 | pte += PTRS_PER_PTE; | |
64 | } | |
65 | ||
66 | return pte; | |
67 | } | |
68 | ||
2f569afd | 69 | static inline pgtable_t |
1da177e4 LT |
70 | pte_alloc_one(struct mm_struct *mm, unsigned long addr) |
71 | { | |
72 | struct page *pte; | |
73 | ||
74 | pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0); | |
75 | if (pte) { | |
76 | void *page = page_address(pte); | |
77 | clean_dcache_area(page, sizeof(pte_t) * PTRS_PER_PTE); | |
2f569afd | 78 | pgtable_page_ctor(pte); |
1da177e4 LT |
79 | } |
80 | ||
81 | return pte; | |
82 | } | |
83 | ||
84 | /* | |
85 | * Free one PTE table. | |
86 | */ | |
5e541973 | 87 | static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) |
1da177e4 LT |
88 | { |
89 | if (pte) { | |
90 | pte -= PTRS_PER_PTE; | |
91 | free_page((unsigned long)pte); | |
92 | } | |
93 | } | |
94 | ||
2f569afd | 95 | static inline void pte_free(struct mm_struct *mm, pgtable_t pte) |
1da177e4 | 96 | { |
2f569afd | 97 | pgtable_page_dtor(pte); |
1da177e4 LT |
98 | __free_page(pte); |
99 | } | |
100 | ||
bdf04248 RK |
101 | static inline void __pmd_populate(pmd_t *pmdp, unsigned long pmdval) |
102 | { | |
103 | pmdp[0] = __pmd(pmdval); | |
104 | pmdp[1] = __pmd(pmdval + 256 * sizeof(pte_t)); | |
105 | flush_pmd_entry(pmdp); | |
106 | } | |
107 | ||
1da177e4 LT |
108 | /* |
109 | * Populate the pmdp entry with a pointer to the pte. This pmd is part | |
110 | * of the mm address space. | |
111 | * | |
112 | * Ensure that we always set both PMD entries. | |
113 | */ | |
114 | static inline void | |
115 | pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep) | |
116 | { | |
117 | unsigned long pte_ptr = (unsigned long)ptep; | |
1da177e4 LT |
118 | |
119 | /* | |
120 | * The pmd must be loaded with the physical | |
121 | * address of the PTE table | |
122 | */ | |
123 | pte_ptr -= PTRS_PER_PTE * sizeof(void *); | |
bdf04248 | 124 | __pmd_populate(pmdp, __pa(pte_ptr) | _PAGE_KERNEL_TABLE); |
1da177e4 LT |
125 | } |
126 | ||
127 | static inline void | |
2f569afd | 128 | pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep) |
1da177e4 | 129 | { |
bdf04248 | 130 | __pmd_populate(pmdp, page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE); |
1da177e4 | 131 | } |
2f569afd | 132 | #define pmd_pgtable(pmd) pmd_page(pmd) |
1da177e4 | 133 | |
002547b4 RK |
134 | #endif /* CONFIG_MMU */ |
135 | ||
1da177e4 | 136 | #endif |