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| 756 | jermar | 1 | /* |
| 2 | * Copyright (C) 2006 Jakub Jermar |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 1266 | jermar | 28 | |
| 29 | /** |
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| 30 | * @file as_ht.c |
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| 31 | * @brief Address space functions for global page hash table. |
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| 32 | */ |
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| 756 | jermar | 33 | |
| 34 | #include <genarch/mm/as_ht.h> |
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| 35 | #include <genarch/mm/page_ht.h> |
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| 36 | #include <mm/as.h> |
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| 37 | #include <mm/frame.h> |
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| 38 | #include <arch/types.h> |
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| 39 | #include <typedefs.h> |
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| 40 | #include <memstr.h> |
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| 792 | jermar | 41 | #include <adt/hash_table.h> |
| 1380 | jermar | 42 | #include <synch/mutex.h> |
| 756 | jermar | 43 | |
| 44 | static pte_t *ht_create(int flags); |
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| 1468 | jermar | 45 | static void ht_destroy(pte_t *page_table); |
| 756 | jermar | 46 | |
| 1044 | jermar | 47 | static void ht_lock(as_t *as, bool lock); |
| 48 | static void ht_unlock(as_t *as, bool unlock); |
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| 49 | |||
| 756 | jermar | 50 | as_operations_t as_ht_operations = { |
| 1044 | jermar | 51 | .page_table_create = ht_create, |
| 1468 | jermar | 52 | .page_table_destroy = ht_destroy, |
| 1044 | jermar | 53 | .page_table_lock = ht_lock, |
| 54 | .page_table_unlock = ht_unlock, |
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| 756 | jermar | 55 | }; |
| 56 | |||
| 57 | |||
| 58 | /** Page hash table create. |
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| 59 | * |
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| 60 | * The page hash table will be created only once |
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| 61 | * and will be shared by all address spaces. |
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| 62 | * |
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| 63 | * @param flags Ignored. |
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| 64 | * |
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| 792 | jermar | 65 | * @return Returns NULL. |
| 756 | jermar | 66 | */ |
| 67 | pte_t *ht_create(int flags) |
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| 68 | { |
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| 792 | jermar | 69 | if (flags & FLAG_AS_KERNEL) { |
| 70 | hash_table_create(&page_ht, PAGE_HT_ENTRIES, 2, &ht_operations); |
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| 1380 | jermar | 71 | mutex_initialize(&page_ht_lock); |
| 756 | jermar | 72 | } |
| 792 | jermar | 73 | return NULL; |
| 756 | jermar | 74 | } |
| 1044 | jermar | 75 | |
| 1468 | jermar | 76 | /** Destroy page table. |
| 77 | * |
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| 78 | * Actually do nothing as the global page hash table is used. |
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| 79 | * |
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| 80 | * @param page_table This parameter is ignored. |
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| 81 | */ |
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| 82 | void ht_destroy(pte_t *page_table) |
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| 83 | { |
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| 84 | /* No-op. */ |
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| 85 | } |
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| 86 | |||
| 1044 | jermar | 87 | /** Lock page table. |
| 88 | * |
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| 89 | * Lock address space and page hash table. |
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| 90 | * Interrupts must be disabled. |
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| 91 | * |
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| 92 | * @param as Address space. |
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| 93 | * @param lock If false, do not attempt to lock the address space. |
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| 94 | */ |
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| 95 | void ht_lock(as_t *as, bool lock) |
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| 96 | { |
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| 97 | if (lock) |
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| 1380 | jermar | 98 | mutex_lock(&as->lock); |
| 99 | mutex_lock(&page_ht_lock); |
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| 1044 | jermar | 100 | } |
| 101 | |||
| 102 | /** Unlock page table. |
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| 103 | * |
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| 104 | * Unlock address space and page hash table. |
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| 105 | * Interrupts must be disabled. |
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| 106 | * |
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| 107 | * @param as Address space. |
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| 108 | * @param unlock If false, do not attempt to lock the address space. |
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| 109 | */ |
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| 110 | void ht_unlock(as_t *as, bool unlock) |
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| 111 | { |
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| 1380 | jermar | 112 | mutex_unlock(&page_ht_lock); |
| 1044 | jermar | 113 | if (unlock) |
| 1380 | jermar | 114 | mutex_unlock(&as->lock); |
| 1044 | jermar | 115 | } |