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| Rev | Author | Line No. | Line |
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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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| 28 | |||
| 29 | #include <genarch/mm/as_ht.h> |
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| 30 | #include <genarch/mm/page_ht.h> |
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| 31 | #include <mm/as.h> |
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| 32 | #include <mm/frame.h> |
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| 33 | #include <arch/types.h> |
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| 34 | #include <typedefs.h> |
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| 35 | #include <memstr.h> |
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| 792 | jermar | 36 | #include <adt/hash_table.h> |
| 1044 | jermar | 37 | #include <synch/spinlock.h> |
| 756 | jermar | 38 | |
| 39 | static pte_t *ht_create(int flags); |
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| 40 | |||
| 1044 | jermar | 41 | static void ht_lock(as_t *as, bool lock); |
| 42 | static void ht_unlock(as_t *as, bool unlock); |
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| 43 | |||
| 756 | jermar | 44 | as_operations_t as_ht_operations = { |
| 1044 | jermar | 45 | .page_table_create = ht_create, |
| 46 | .page_table_lock = ht_lock, |
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| 47 | .page_table_unlock = ht_unlock, |
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| 756 | jermar | 48 | }; |
| 49 | |||
| 50 | |||
| 51 | /** Page hash table create. |
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| 52 | * |
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| 53 | * The page hash table will be created only once |
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| 54 | * and will be shared by all address spaces. |
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| 55 | * |
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| 56 | * @param flags Ignored. |
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| 57 | * |
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| 792 | jermar | 58 | * @return Returns NULL. |
| 756 | jermar | 59 | */ |
| 60 | pte_t *ht_create(int flags) |
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| 61 | { |
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| 792 | jermar | 62 | if (flags & FLAG_AS_KERNEL) { |
| 63 | hash_table_create(&page_ht, PAGE_HT_ENTRIES, 2, &ht_operations); |
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| 756 | jermar | 64 | } |
| 792 | jermar | 65 | return NULL; |
| 756 | jermar | 66 | } |
| 1044 | jermar | 67 | |
| 68 | /** Lock page table. |
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| 69 | * |
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| 70 | * Lock address space and page hash table. |
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| 71 | * Interrupts must be disabled. |
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| 72 | * |
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| 73 | * @param as Address space. |
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| 74 | * @param lock If false, do not attempt to lock the address space. |
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| 75 | */ |
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| 76 | void ht_lock(as_t *as, bool lock) |
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| 77 | { |
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| 78 | if (lock) |
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| 79 | spinlock_lock(&as->lock); |
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| 80 | spinlock_lock(&page_ht_lock); |
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| 81 | } |
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| 82 | |||
| 83 | /** Unlock page table. |
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| 84 | * |
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| 85 | * Unlock address space and page hash table. |
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| 86 | * Interrupts must be disabled. |
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| 87 | * |
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| 88 | * @param as Address space. |
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| 89 | * @param unlock If false, do not attempt to lock the address space. |
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| 90 | */ |
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| 91 | void ht_unlock(as_t *as, bool unlock) |
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| 92 | { |
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| 93 | spinlock_unlock(&page_ht_lock); |
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| 94 | if (unlock) |
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| 95 | spinlock_unlock(&as->lock); |
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| 96 | } |