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