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1 | /* |
1 | /* |
2 | * Copyright (C) 2006 Jakub Jermar |
2 | * Copyright (C) 2006 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | #include <genarch/mm/page_ht.h> |
29 | #include <genarch/mm/page_ht.h> |
30 | #include <mm/page.h> |
30 | #include <mm/page.h> |
31 | #include <arch/mm/page.h> |
31 | #include <arch/mm/page.h> |
32 | #include <mm/frame.h> |
32 | #include <mm/frame.h> |
33 | #include <mm/slab.h> |
33 | #include <mm/slab.h> |
34 | #include <mm/as.h> |
34 | #include <mm/as.h> |
35 | #include <arch/mm/asid.h> |
35 | #include <arch/mm/asid.h> |
36 | #include <arch/types.h> |
36 | #include <arch/types.h> |
37 | #include <typedefs.h> |
37 | #include <typedefs.h> |
38 | #include <arch/asm.h> |
38 | #include <arch/asm.h> |
39 | #include <synch/spinlock.h> |
39 | #include <synch/spinlock.h> |
40 | #include <arch.h> |
40 | #include <arch.h> |
41 | #include <debug.h> |
41 | #include <debug.h> |
42 | #include <memstr.h> |
42 | #include <memstr.h> |
43 | #include <adt/hash_table.h> |
43 | #include <adt/hash_table.h> |
44 | 44 | ||
45 | static index_t hash(__native key[]); |
45 | static index_t hash(__native key[]); |
46 | static bool compare(__native key[], count_t keys, link_t *item); |
46 | static bool compare(__native key[], count_t keys, link_t *item); |
47 | static void remove_callback(link_t *item); |
47 | static void remove_callback(link_t *item); |
48 | 48 | ||
49 | static void ht_mapping_insert(as_t *as, __address page, __address frame, int flags); |
49 | static void ht_mapping_insert(as_t *as, __address page, __address frame, int flags); |
50 | static void ht_mapping_remove(as_t *as, __address page); |
50 | static void ht_mapping_remove(as_t *as, __address page); |
51 | static pte_t *ht_mapping_find(as_t *as, __address page); |
51 | static pte_t *ht_mapping_find(as_t *as, __address page); |
52 | 52 | ||
53 | /** |
53 | /** |
54 | * This lock protects the page hash table. |
54 | * This lock protects the page hash table. |
55 | */ |
55 | */ |
56 | SPINLOCK_INITIALIZE(page_ht_lock); |
56 | SPINLOCK_INITIALIZE(page_ht_lock); |
57 | 57 | ||
58 | /** |
58 | /** |
59 | * Page hash table. |
59 | * Page hash table. |
60 | * The page hash table may be accessed only when page_ht_lock is held. |
60 | * The page hash table may be accessed only when page_ht_lock is held. |
61 | */ |
61 | */ |
62 | hash_table_t page_ht; |
62 | hash_table_t page_ht; |
63 | 63 | ||
64 | /** Hash table operations for page hash table. */ |
64 | /** Hash table operations for page hash table. */ |
65 | hash_table_operations_t ht_operations = { |
65 | hash_table_operations_t ht_operations = { |
66 | .hash = hash, |
66 | .hash = hash, |
67 | .compare = compare, |
67 | .compare = compare, |
68 | .remove_callback = remove_callback |
68 | .remove_callback = remove_callback |
69 | }; |
69 | }; |
70 | 70 | ||
71 | /** Page mapping operations for page hash table architectures. */ |
71 | /** Page mapping operations for page hash table architectures. */ |
72 | page_mapping_operations_t ht_mapping_operations = { |
72 | page_mapping_operations_t ht_mapping_operations = { |
73 | .mapping_insert = ht_mapping_insert, |
73 | .mapping_insert = ht_mapping_insert, |
74 | .mapping_remove = ht_mapping_remove, |
74 | .mapping_remove = ht_mapping_remove, |
75 | .mapping_find = ht_mapping_find |
75 | .mapping_find = ht_mapping_find |
76 | }; |
76 | }; |
77 | 77 | ||
78 | /** Compute page hash table index. |
78 | /** Compute page hash table index. |
79 | * |
79 | * |
80 | * @param key Array of two keys (i.e. page and address space). |
80 | * @param key Array of two keys (i.e. page and address space). |
81 | * |
81 | * |
82 | * @return Index into page hash table. |
82 | * @return Index into page hash table. |
83 | */ |
83 | */ |
84 | index_t hash(__native key[]) |
84 | index_t hash(__native key[]) |
85 | { |
85 | { |
86 | as_t *as = (as_t *) key[KEY_AS]; |
86 | as_t *as = (as_t *) key[KEY_AS]; |
87 | __address page = (__address) key[KEY_PAGE]; |
87 | __address page = (__address) key[KEY_PAGE]; |
88 | index_t index; |
88 | index_t index; |
89 | 89 | ||
90 | /* |
90 | /* |
91 | * Virtual page addresses have roughly the same probability |
91 | * Virtual page addresses have roughly the same probability |
92 | * of occurring. Least significant bits of VPN compose the |
92 | * of occurring. Least significant bits of VPN compose the |
93 | * hash index. |
93 | * hash index. |
94 | */ |
94 | */ |
95 | index = ((page >> PAGE_WIDTH) & (PAGE_HT_ENTRIES-1)); |
95 | index = ((page >> PAGE_WIDTH) & (PAGE_HT_ENTRIES-1)); |
96 | 96 | ||
97 | /* |
97 | /* |
98 | * Address space structures are likely to be allocated from |
98 | * Address space structures are likely to be allocated from |
99 | * similar addresses. Least significant bits compose the |
99 | * similar addresses. Least significant bits compose the |
100 | * hash index. |
100 | * hash index. |
101 | */ |
101 | */ |
102 | index |= ((__native) as) & (PAGE_HT_ENTRIES-1); |
102 | index |= ((__native) as) & (PAGE_HT_ENTRIES-1); |
103 | 103 | ||
104 | return index; |
104 | return index; |
105 | } |
105 | } |
106 | 106 | ||
107 | /** Compare page hash table item with page and/or address space. |
107 | /** Compare page hash table item with page and/or address space. |
108 | * |
108 | * |
109 | * @param key Array of one or two keys (i.e. page and/or address space). |
109 | * @param key Array of one or two keys (i.e. page and/or address space). |
110 | * @param keys Number of keys passed. |
110 | * @param keys Number of keys passed. |
111 | * @param item Item to compare the keys with. |
111 | * @param item Item to compare the keys with. |
112 | * |
112 | * |
113 | * @return true on match, false otherwise. |
113 | * @return true on match, false otherwise. |
114 | */ |
114 | */ |
115 | bool compare(__native key[], count_t keys, link_t *item) |
115 | bool compare(__native key[], count_t keys, link_t *item) |
116 | { |
116 | { |
117 | pte_t *t; |
117 | pte_t *t; |
118 | 118 | ||
119 | ASSERT(item); |
119 | ASSERT(item); |
120 | ASSERT((keys > 0) && (keys <= PAGE_HT_KEYS)); |
120 | ASSERT((keys > 0) && (keys <= PAGE_HT_KEYS)); |
121 | 121 | ||
122 | /* |
122 | /* |
123 | * Convert item to PTE. |
123 | * Convert item to PTE. |
124 | */ |
124 | */ |
125 | t = hash_table_get_instance(item, pte_t, link); |
125 | t = hash_table_get_instance(item, pte_t, link); |
126 | 126 | ||
127 | if (keys == PAGE_HT_KEYS) { |
127 | if (keys == PAGE_HT_KEYS) { |
128 | return (key[KEY_AS] == (__address) t->as) && (key[KEY_PAGE] == t->page); |
128 | return (key[KEY_AS] == (__address) t->as) && (key[KEY_PAGE] == t->page); |
129 | } else { |
129 | } else { |
130 | return (key[KEY_AS] == (__address) t->as); |
130 | return (key[KEY_AS] == (__address) t->as); |
131 | } |
131 | } |
132 | } |
132 | } |
133 | 133 | ||
134 | /** Callback on page hash table item removal. |
134 | /** Callback on page hash table item removal. |
135 | * |
135 | * |
136 | * @param item Page hash table item being removed. |
136 | * @param item Page hash table item being removed. |
137 | */ |
137 | */ |
138 | void remove_callback(link_t *item) |
138 | void remove_callback(link_t *item) |
139 | { |
139 | { |
140 | pte_t *t; |
140 | pte_t *t; |
141 | 141 | ||
142 | ASSERT(item); |
142 | ASSERT(item); |
143 | 143 | ||
144 | /* |
144 | /* |
145 | * Convert item to PTE. |
145 | * Convert item to PTE. |
146 | */ |
146 | */ |
147 | t = hash_table_get_instance(item, pte_t, link); |
147 | t = hash_table_get_instance(item, pte_t, link); |
148 | 148 | ||
149 | free(t); |
149 | free(t); |
150 | } |
150 | } |
151 | 151 | ||
152 | /** Map page to frame using page hash table. |
152 | /** Map page to frame using page hash table. |
153 | * |
153 | * |
154 | * Map virtual address 'page' to physical address 'frame' |
154 | * Map virtual address 'page' to physical address 'frame' |
155 | * using 'flags'. |
155 | * using 'flags'. |
156 | * |
156 | * |
157 | * The address space must be locked and interruptsmust be disabled. |
157 | * The address space must be locked and interruptsmust be disabled. |
158 | * |
158 | * |
159 | * @param as Address space to which page belongs. |
159 | * @param as Address space to which page belongs. |
160 | * @param page Virtual address of the page to be mapped. |
160 | * @param page Virtual address of the page to be mapped. |
161 | * @param frame Physical address of memory frame to which the mapping is done. |
161 | * @param frame Physical address of memory frame to which the mapping is done. |
162 | * @param flags Flags to be used for mapping. |
162 | * @param flags Flags to be used for mapping. |
163 | */ |
163 | */ |
164 | void ht_mapping_insert(as_t *as, __address page, __address frame, int flags) |
164 | void ht_mapping_insert(as_t *as, __address page, __address frame, int flags) |
165 | { |
165 | { |
166 | pte_t *t; |
166 | pte_t *t; |
167 | __native key[2] = { (__address) as, page }; |
167 | __native key[2] = { (__address) as, page }; |
168 | 168 | ||
169 | spinlock_lock(&page_ht_lock); |
169 | spinlock_lock(&page_ht_lock); |
170 | 170 | ||
171 | if (!hash_table_find(&page_ht, key)) { |
171 | if (!hash_table_find(&page_ht, key)) { |
172 | t = (pte_t *) malloc(sizeof(pte_t), FRAME_ATOMIC); |
172 | t = (pte_t *) malloc(sizeof(pte_t), FRAME_ATOMIC); |
173 | ASSERT(t != NULL); |
173 | ASSERT(t != NULL); |
174 | 174 | ||
- | 175 | t->g = (flags & PAGE_GLOBAL) != 0; |
|
- | 176 | t->x = (flags & PAGE_EXEC) != 0; |
|
- | 177 | t->w = (flags & PAGE_WRITE) != 0; |
|
- | 178 | t->k = !(flags & PAGE_USER); |
|
- | 179 | t->c = (flags & PAGE_CACHEABLE) != 0; |
|
- | 180 | t->p = !(flags & PAGE_NOT_PRESENT); |
|
- | 181 | ||
- | 182 | t->as = as; |
|
- | 183 | t->page = page; |
|
- | 184 | t->frame = frame; |
|
- | 185 | ||
175 | hash_table_insert(&page_ht, key, &t->link); |
186 | hash_table_insert(&page_ht, key, &t->link); |
176 | } |
187 | } |
177 | 188 | ||
178 | spinlock_unlock(&page_ht_lock); |
189 | spinlock_unlock(&page_ht_lock); |
179 | } |
190 | } |
180 | 191 | ||
181 | /** Remove mapping of page from page hash table. |
192 | /** Remove mapping of page from page hash table. |
182 | * |
193 | * |
183 | * Remove any mapping of 'page' within address space 'as'. |
194 | * Remove any mapping of 'page' within address space 'as'. |
184 | * TLB shootdown should follow in order to make effects of |
195 | * TLB shootdown should follow in order to make effects of |
185 | * this call visible. |
196 | * this call visible. |
186 | * |
197 | * |
187 | * The address space must be locked and interrupts must be disabled. |
198 | * The address space must be locked and interrupts must be disabled. |
188 | * |
199 | * |
189 | * @param as Address space to wich page belongs. |
200 | * @param as Address space to wich page belongs. |
190 | * @param page Virtual address of the page to be demapped. |
201 | * @param page Virtual address of the page to be demapped. |
191 | */ |
202 | */ |
192 | void ht_mapping_remove(as_t *as, __address page) |
203 | void ht_mapping_remove(as_t *as, __address page) |
193 | { |
204 | { |
194 | __native key[2] = { (__address) as, page }; |
205 | __native key[2] = { (__address) as, page }; |
195 | 206 | ||
196 | spinlock_lock(&page_ht_lock); |
207 | spinlock_lock(&page_ht_lock); |
197 | 208 | ||
198 | /* |
209 | /* |
199 | * Note that removed PTE's will be freed |
210 | * Note that removed PTE's will be freed |
200 | * by remove_callback(). |
211 | * by remove_callback(). |
201 | */ |
212 | */ |
202 | hash_table_remove(&page_ht, key, 2); |
213 | hash_table_remove(&page_ht, key, 2); |
203 | 214 | ||
204 | spinlock_unlock(&page_ht_lock); |
215 | spinlock_unlock(&page_ht_lock); |
205 | } |
216 | } |
206 | 217 | ||
207 | 218 | ||
208 | /** Find mapping for virtual page in page hash table. |
219 | /** Find mapping for virtual page in page hash table. |
209 | * |
220 | * |
210 | * Find mapping for virtual page. |
221 | * Find mapping for virtual page. |
211 | * |
222 | * |
212 | * The address space must be locked and interrupts must be disabled. |
223 | * The address space must be locked and interrupts must be disabled. |
213 | * |
224 | * |
214 | * @param as Address space to wich page belongs. |
225 | * @param as Address space to wich page belongs. |
215 | * @param page Virtual page. |
226 | * @param page Virtual page. |
216 | * |
227 | * |
217 | * @return NULL if there is no such mapping; requested mapping otherwise. |
228 | * @return NULL if there is no such mapping; requested mapping otherwise. |
218 | */ |
229 | */ |
219 | pte_t *ht_mapping_find(as_t *as, __address page) |
230 | pte_t *ht_mapping_find(as_t *as, __address page) |
220 | { |
231 | { |
221 | link_t *hlp; |
232 | link_t *hlp; |
222 | pte_t *t = NULL; |
233 | pte_t *t = NULL; |
223 | __native key[2] = { (__address) as, page }; |
234 | __native key[2] = { (__address) as, page }; |
224 | 235 | ||
225 | spinlock_lock(&page_ht_lock); |
236 | spinlock_lock(&page_ht_lock); |
226 | 237 | ||
227 | hlp = hash_table_find(&page_ht, key); |
238 | hlp = hash_table_find(&page_ht, key); |
228 | if (hlp) |
239 | if (hlp) |
229 | t = hash_table_get_instance(hlp, pte_t, link); |
240 | t = hash_table_get_instance(hlp, pte_t, link); |
230 | 241 | ||
231 | spinlock_unlock(&page_ht_lock); |
242 | spinlock_unlock(&page_ht_lock); |
232 | return t; |
243 | return t; |
233 | } |
244 | } |
234 | 245 |