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| Rev | Author | Line No. | Line |
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| 684 | 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/page_ht.h> |
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| 30 | #include <mm/page.h> |
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| 31 | #include <mm/frame.h> |
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| 699 | jermar | 32 | #include <mm/heap.h> |
| 687 | jermar | 33 | #include <arch/mm/asid.h> |
| 684 | jermar | 34 | #include <arch/types.h> |
| 35 | #include <typedefs.h> |
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| 36 | #include <arch/asm.h> |
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| 699 | jermar | 37 | #include <debug.h> |
| 684 | jermar | 38 | |
| 687 | jermar | 39 | static void ht_mapping_insert(__address page, asid_t asid, __address frame, int flags, __address root); |
| 40 | static pte_t *ht_mapping_find(__address page, asid_t asid, __address root); |
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| 684 | jermar | 41 | |
| 42 | page_operations_t page_ht_operations = { |
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| 43 | .mapping_insert = ht_mapping_insert, |
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| 44 | .mapping_find = ht_mapping_find |
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| 45 | }; |
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| 46 | |||
| 47 | /** Map page to frame using page hash table. |
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| 48 | * |
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| 49 | * Map virtual address 'page' to physical address 'frame' |
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| 50 | * using 'flags'. |
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| 51 | * |
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| 52 | * @param page Virtual address of the page to be mapped. |
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| 687 | jermar | 53 | * @param asid Address space to which page belongs. |
| 684 | jermar | 54 | * @param frame Physical address of memory frame to which the mapping is done. |
| 55 | * @param flags Flags to be used for mapping. |
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| 699 | jermar | 56 | * @param root Ignored. |
| 684 | jermar | 57 | */ |
| 699 | jermar | 58 | void ht_mapping_insert(__address page, asid_t asid, __address frame, int flags, __address root) |
| 684 | jermar | 59 | { |
| 699 | jermar | 60 | pte_t *t, *u = NULL; |
| 61 | |||
| 62 | t = HT_HASH(page, asid); |
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| 63 | if (!HT_SLOT_EMPTY(t)) { |
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| 64 | u = (pte_t *) malloc(sizeof(pte_t)); /* FIXME: use slab allocator for this */ |
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| 65 | if (!u) |
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| 66 | panic("could not allocate memory for hash table\n"); |
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| 67 | *u = *t; |
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| 68 | } |
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| 69 | HT_SET_NEXT(t, u); |
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| 70 | HT_SET_RECORD(t, page, asid, frame, flags); |
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| 684 | jermar | 71 | } |
| 72 | |||
| 73 | /** Find mapping for virtual page in page hash table. |
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| 74 | * |
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| 75 | * Find mapping for virtual page. |
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| 76 | * |
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| 77 | * @param page Virtual page. |
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| 687 | jermar | 78 | * @param asid Address space to wich page belongs. |
| 699 | jermar | 79 | * @param root Ignored. |
| 684 | jermar | 80 | * |
| 699 | jermar | 81 | * @return NULL if there is no such mapping; requested mapping otherwise. |
| 684 | jermar | 82 | */ |
| 687 | jermar | 83 | pte_t *ht_mapping_find(__address page, asid_t asid, __address root) |
| 684 | jermar | 84 | { |
| 699 | jermar | 85 | pte_t *t; |
| 86 | |||
| 87 | t = HT_HASH(page, asid); |
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| 88 | while (!HT_COMPARE(page, asid, t) && HT_GET_NEXT(t)) |
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| 89 | t = HT_GET_NEXT(t); |
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| 90 | |||
| 91 | return HT_COMPARE(page, asid, t) ? t : NULL; |
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| 684 | jermar | 92 | } |