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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 | /** @addtogroup genarchmm |
29 | /** @addtogroup genarchmm |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | 32 | ||
33 | /** |
33 | /** |
34 | * @file |
34 | * @file |
35 | * @brief Address space functions for global page hash table. |
35 | * @brief Address space functions for global page hash table. |
36 | */ |
36 | */ |
37 | 37 | ||
38 | #include <arch/mm/as.h> |
38 | #include <arch/mm/as.h> |
39 | #include <genarch/mm/as_ht.h> |
39 | #include <genarch/mm/as_ht.h> |
40 | #include <genarch/mm/page_ht.h> |
40 | #include <genarch/mm/page_ht.h> |
41 | #include <mm/as.h> |
41 | #include <mm/as.h> |
42 | #include <mm/frame.h> |
42 | #include <mm/frame.h> |
43 | #include <arch/types.h> |
43 | #include <arch/types.h> |
44 | #include <memstr.h> |
44 | #include <memstr.h> |
45 | #include <adt/hash_table.h> |
45 | #include <adt/hash_table.h> |
46 | #include <synch/mutex.h> |
46 | #include <synch/mutex.h> |
47 | 47 | ||
48 | static pte_t *ht_create(int flags); |
48 | static pte_t *ht_create(int flags); |
49 | static void ht_destroy(pte_t *page_table); |
49 | static void ht_destroy(pte_t *page_table); |
50 | 50 | ||
51 | static void ht_lock(as_t *as, bool lock); |
51 | static void ht_lock(as_t *as, bool lock); |
52 | static void ht_unlock(as_t *as, bool unlock); |
52 | static void ht_unlock(as_t *as, bool unlock); |
53 | 53 | ||
54 | as_operations_t as_ht_operations = { |
54 | as_operations_t as_ht_operations = { |
55 | .page_table_create = ht_create, |
55 | .page_table_create = ht_create, |
56 | .page_table_destroy = ht_destroy, |
56 | .page_table_destroy = ht_destroy, |
57 | .page_table_lock = ht_lock, |
57 | .page_table_lock = ht_lock, |
58 | .page_table_unlock = ht_unlock, |
58 | .page_table_unlock = ht_unlock, |
59 | }; |
59 | }; |
60 | 60 | ||
61 | 61 | ||
62 | /** Page hash table create. |
62 | /** Page hash table create. |
63 | * |
63 | * |
64 | * The page hash table will be created only once |
64 | * The page hash table will be created only once |
65 | * and will be shared by all address spaces. |
65 | * and will be shared by all address spaces. |
66 | * |
66 | * |
67 | * @param flags Ignored. |
67 | * @param flags Ignored. |
68 | * |
68 | * |
69 | * @return Returns NULL. |
69 | * @return Returns NULL. |
70 | */ |
70 | */ |
71 | pte_t *ht_create(int flags) |
71 | pte_t *ht_create(int flags) |
72 | { |
72 | { |
73 | if (flags & FLAG_AS_KERNEL) { |
73 | if (flags & FLAG_AS_KERNEL) { |
74 | hash_table_create(&page_ht, PAGE_HT_ENTRIES, 2, &ht_operations); |
74 | hash_table_create(&page_ht, PAGE_HT_ENTRIES, 2, &ht_operations); |
75 | mutex_initialize(&page_ht_lock); |
75 | mutex_initialize(&page_ht_lock, MUTEX_PASSIVE); |
76 | } |
76 | } |
77 | return NULL; |
77 | return NULL; |
78 | } |
78 | } |
79 | 79 | ||
80 | /** Destroy page table. |
80 | /** Destroy page table. |
81 | * |
81 | * |
82 | * Actually do nothing as the global page hash table is used. |
82 | * Actually do nothing as the global page hash table is used. |
83 | * |
83 | * |
84 | * @param page_table This parameter is ignored. |
84 | * @param page_table This parameter is ignored. |
85 | */ |
85 | */ |
86 | void ht_destroy(pte_t *page_table) |
86 | void ht_destroy(pte_t *page_table) |
87 | { |
87 | { |
88 | /* No-op. */ |
88 | /* No-op. */ |
89 | } |
89 | } |
90 | 90 | ||
91 | /** Lock page table. |
91 | /** Lock page table. |
92 | * |
92 | * |
93 | * Lock address space and page hash table. |
93 | * Lock address space and page hash table. |
94 | * Interrupts must be disabled. |
94 | * Interrupts must be disabled. |
95 | * |
95 | * |
96 | * @param as Address space. |
96 | * @param as Address space. |
97 | * @param lock If false, do not attempt to lock the address space. |
97 | * @param lock If false, do not attempt to lock the address space. |
98 | */ |
98 | */ |
99 | void ht_lock(as_t *as, bool lock) |
99 | void ht_lock(as_t *as, bool lock) |
100 | { |
100 | { |
101 | if (lock) |
101 | if (lock) |
102 | mutex_lock(&as->lock); |
102 | mutex_lock(&as->lock); |
103 | mutex_lock(&page_ht_lock); |
103 | mutex_lock(&page_ht_lock); |
104 | } |
104 | } |
105 | 105 | ||
106 | /** Unlock page table. |
106 | /** Unlock page table. |
107 | * |
107 | * |
108 | * Unlock address space and page hash table. |
108 | * Unlock address space and page hash table. |
109 | * Interrupts must be disabled. |
109 | * Interrupts must be disabled. |
110 | * |
110 | * |
111 | * @param as Address space. |
111 | * @param as Address space. |
112 | * @param unlock If false, do not attempt to lock the address space. |
112 | * @param unlock If false, do not attempt to lock the address space. |
113 | */ |
113 | */ |
114 | void ht_unlock(as_t *as, bool unlock) |
114 | void ht_unlock(as_t *as, bool unlock) |
115 | { |
115 | { |
116 | mutex_unlock(&page_ht_lock); |
116 | mutex_unlock(&page_ht_lock); |
117 | if (unlock) |
117 | if (unlock) |
118 | mutex_unlock(&as->lock); |
118 | mutex_unlock(&as->lock); |
119 | } |
119 | } |
120 | 120 | ||
121 | /** @} |
121 | /** @} |
122 | */ |
122 | */ |
123 | 123 |