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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 */ |