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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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| 36 | |||
| 37 | static pte_t *ht_create(int flags); |
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| 38 | |||
| 39 | as_operations_t as_ht_operations = { |
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| 40 | .page_table_create = ht_create |
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| 41 | }; |
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| 42 | |||
| 43 | |||
| 44 | /** Page hash table create. |
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| 45 | * |
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| 46 | * The page hash table will be created only once |
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| 47 | * and will be shared by all address spaces. |
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| 48 | * |
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| 49 | * @param flags Ignored. |
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| 50 | * |
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| 51 | * @return Address of global page hash table. |
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| 52 | */ |
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| 53 | pte_t *ht_create(int flags) |
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| 54 | { |
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| 55 | if (!page_ht) { |
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| 56 | page_ht = (pte_t *) frame_alloc(FRAME_KA | FRAME_PANIC, HT_WIDTH - FRAME_WIDTH, NULL); |
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| 57 | memsetb((__address) page_ht, HT_SIZE, 0); |
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| 58 | } |
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| 59 | return page_ht; |
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| 60 | } |