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Diffstat (limited to 'include/asm-sh64/pgalloc.h')
-rw-r--r-- | include/asm-sh64/pgalloc.h | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/include/asm-sh64/pgalloc.h b/include/asm-sh64/pgalloc.h new file mode 100644 index 000000000000..b25f5df5535c --- /dev/null +++ b/include/asm-sh64/pgalloc.h | |||
@@ -0,0 +1,195 @@ | |||
1 | #ifndef __ASM_SH64_PGALLOC_H | ||
2 | #define __ASM_SH64_PGALLOC_H | ||
3 | |||
4 | /* | ||
5 | * This file is subject to the terms and conditions of the GNU General Public | ||
6 | * License. See the file "COPYING" in the main directory of this archive | ||
7 | * for more details. | ||
8 | * | ||
9 | * include/asm-sh64/pgalloc.h | ||
10 | * | ||
11 | * Copyright (C) 2000, 2001 Paolo Alberelli | ||
12 | * Copyright (C) 2003, 2004 Paul Mundt | ||
13 | * Copyright (C) 2003, 2004 Richard Curnow | ||
14 | * | ||
15 | */ | ||
16 | |||
17 | #include <linux/threads.h> | ||
18 | #include <linux/mm.h> | ||
19 | |||
20 | #define pgd_quicklist (current_cpu_data.pgd_quick) | ||
21 | #define pmd_quicklist (current_cpu_data.pmd_quick) | ||
22 | #define pte_quicklist (current_cpu_data.pte_quick) | ||
23 | #define pgtable_cache_size (current_cpu_data.pgtable_cache_sz) | ||
24 | |||
25 | static inline void pgd_init(unsigned long page) | ||
26 | { | ||
27 | unsigned long *pgd = (unsigned long *)page; | ||
28 | extern pte_t empty_bad_pte_table[PTRS_PER_PTE]; | ||
29 | int i; | ||
30 | |||
31 | for (i = 0; i < USER_PTRS_PER_PGD; i++) | ||
32 | pgd[i] = (unsigned long)empty_bad_pte_table; | ||
33 | } | ||
34 | |||
35 | /* | ||
36 | * Allocate and free page tables. The xxx_kernel() versions are | ||
37 | * used to allocate a kernel page table - this turns on ASN bits | ||
38 | * if any. | ||
39 | */ | ||
40 | |||
41 | extern __inline__ pgd_t *get_pgd_slow(void) | ||
42 | { | ||
43 | unsigned int pgd_size = (USER_PTRS_PER_PGD * sizeof(pgd_t)); | ||
44 | pgd_t *ret = (pgd_t *)kmalloc(pgd_size, GFP_KERNEL); | ||
45 | return ret; | ||
46 | } | ||
47 | |||
48 | extern __inline__ pgd_t *get_pgd_fast(void) | ||
49 | { | ||
50 | unsigned long *ret; | ||
51 | |||
52 | if ((ret = pgd_quicklist) != NULL) { | ||
53 | pgd_quicklist = (unsigned long *)(*ret); | ||
54 | ret[0] = 0; | ||
55 | pgtable_cache_size--; | ||
56 | } else | ||
57 | ret = (unsigned long *)get_pgd_slow(); | ||
58 | |||
59 | if (ret) { | ||
60 | memset(ret, 0, USER_PTRS_PER_PGD * sizeof(pgd_t)); | ||
61 | } | ||
62 | return (pgd_t *)ret; | ||
63 | } | ||
64 | |||
65 | extern __inline__ void free_pgd_fast(pgd_t *pgd) | ||
66 | { | ||
67 | *(unsigned long *)pgd = (unsigned long) pgd_quicklist; | ||
68 | pgd_quicklist = (unsigned long *) pgd; | ||
69 | pgtable_cache_size++; | ||
70 | } | ||
71 | |||
72 | extern __inline__ void free_pgd_slow(pgd_t *pgd) | ||
73 | { | ||
74 | kfree((void *)pgd); | ||
75 | } | ||
76 | |||
77 | extern pte_t *get_pte_slow(pmd_t *pmd, unsigned long address_preadjusted); | ||
78 | extern pte_t *get_pte_kernel_slow(pmd_t *pmd, unsigned long address_preadjusted); | ||
79 | |||
80 | extern __inline__ pte_t *get_pte_fast(void) | ||
81 | { | ||
82 | unsigned long *ret; | ||
83 | |||
84 | if((ret = (unsigned long *)pte_quicklist) != NULL) { | ||
85 | pte_quicklist = (unsigned long *)(*ret); | ||
86 | ret[0] = ret[1]; | ||
87 | pgtable_cache_size--; | ||
88 | } | ||
89 | return (pte_t *)ret; | ||
90 | } | ||
91 | |||
92 | extern __inline__ void free_pte_fast(pte_t *pte) | ||
93 | { | ||
94 | *(unsigned long *)pte = (unsigned long) pte_quicklist; | ||
95 | pte_quicklist = (unsigned long *) pte; | ||
96 | pgtable_cache_size++; | ||
97 | } | ||
98 | |||
99 | static inline void pte_free_kernel(pte_t *pte) | ||
100 | { | ||
101 | free_page((unsigned long)pte); | ||
102 | } | ||
103 | |||
104 | static inline void pte_free(struct page *pte) | ||
105 | { | ||
106 | __free_page(pte); | ||
107 | } | ||
108 | |||
109 | static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, | ||
110 | unsigned long address) | ||
111 | { | ||
112 | pte_t *pte; | ||
113 | |||
114 | pte = (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT|__GFP_ZERO); | ||
115 | |||
116 | return pte; | ||
117 | } | ||
118 | |||
119 | static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address) | ||
120 | { | ||
121 | struct page *pte; | ||
122 | |||
123 | pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0); | ||
124 | |||
125 | return pte; | ||
126 | } | ||
127 | |||
128 | #define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte)) | ||
129 | |||
130 | /* | ||
131 | * allocating and freeing a pmd is trivial: the 1-entry pmd is | ||
132 | * inside the pgd, so has no extra memory associated with it. | ||
133 | */ | ||
134 | |||
135 | #if defined(CONFIG_SH64_PGTABLE_2_LEVEL) | ||
136 | |||
137 | #define pmd_alloc_one(mm, addr) ({ BUG(); ((pmd_t *)2); }) | ||
138 | #define pmd_free(x) do { } while (0) | ||
139 | #define pgd_populate(mm, pmd, pte) BUG() | ||
140 | #define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte)) | ||
141 | #define __pmd_free_tlb(tlb,pmd) do { } while (0) | ||
142 | |||
143 | #elif defined(CONFIG_SH64_PGTABLE_3_LEVEL) | ||
144 | |||
145 | static __inline__ pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address) | ||
146 | { | ||
147 | pmd_t *pmd; | ||
148 | pmd = (pmd_t *) __get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO); | ||
149 | return pmd; | ||
150 | } | ||
151 | |||
152 | static __inline__ void pmd_free(pmd_t *pmd) | ||
153 | { | ||
154 | free_page((unsigned long) pmd); | ||
155 | } | ||
156 | |||
157 | #define pgd_populate(mm, pgd, pmd) pgd_set(pgd, pmd) | ||
158 | #define __pmd_free_tlb(tlb,pmd) pmd_free(pmd) | ||
159 | |||
160 | #else | ||
161 | #error "No defined page table size" | ||
162 | #endif | ||
163 | |||
164 | #define check_pgt_cache() do { } while (0) | ||
165 | #define pgd_free(pgd) free_pgd_slow(pgd) | ||
166 | #define pgd_alloc(mm) get_pgd_fast() | ||
167 | |||
168 | extern int do_check_pgt_cache(int, int); | ||
169 | |||
170 | extern inline void set_pgdir(unsigned long address, pgd_t entry) | ||
171 | { | ||
172 | struct task_struct * p; | ||
173 | pgd_t *pgd; | ||
174 | |||
175 | read_lock(&tasklist_lock); | ||
176 | for_each_process(p) { | ||
177 | if (!p->mm) | ||
178 | continue; | ||
179 | *pgd_offset(p->mm,address) = entry; | ||
180 | } | ||
181 | read_unlock(&tasklist_lock); | ||
182 | for (pgd = (pgd_t *)pgd_quicklist; pgd; pgd = (pgd_t *)*(unsigned long *)pgd) | ||
183 | pgd[address >> PGDIR_SHIFT] = entry; | ||
184 | } | ||
185 | |||
186 | #define pmd_populate_kernel(mm, pmd, pte) \ | ||
187 | set_pmd(pmd, __pmd(_PAGE_TABLE + (unsigned long) (pte))) | ||
188 | |||
189 | static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, | ||
190 | struct page *pte) | ||
191 | { | ||
192 | set_pmd(pmd, __pmd(_PAGE_TABLE + (unsigned long) page_address (pte))); | ||
193 | } | ||
194 | |||
195 | #endif /* __ASM_SH64_PGALLOC_H */ | ||