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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 | /* |
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| 30 | * This is the generic page hash table interface. |
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| 699 | jermar | 31 | * Architectures that use single page hash table for |
| 32 | * storing page translations must implement it. |
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| 684 | jermar | 33 | */ |
| 34 | |||
| 35 | #ifndef __PAGE_HT_H__ |
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| 36 | #define __PAGE_HT_H__ |
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| 37 | |||
| 38 | #include <mm/page.h> |
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| 746 | jermar | 39 | #include <typedefs.h> |
| 684 | jermar | 40 | |
| 756 | jermar | 41 | /** Page hash table size. */ |
| 42 | #define HT_WIDTH HT_WIDTH_ARCH |
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| 43 | #define HT_SIZE (1<<HT_WIDTH) |
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| 44 | #define HT_ENTRIES (HT_SIZE/sizeof(pte_t)) |
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| 746 | jermar | 45 | |
| 699 | jermar | 46 | /** Hash function. |
| 47 | * |
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| 48 | * @param page Virtual address. Only vpn bits will be used. |
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| 49 | * @param asid Address space identifier. |
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| 50 | * |
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| 51 | * @return Pointer to hash table typed pte_t *. |
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| 52 | */ |
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| 53 | #define HT_HASH(page, asid) HT_HASH_ARCH(page, asid) |
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| 54 | |||
| 55 | /** Compare PTE with page and asid. |
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| 56 | * |
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| 57 | * @param page Virtual address. Only vpn bits will be used. |
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| 58 | * @param asid Address space identifier. |
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| 59 | * @param t PTE. |
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| 60 | * |
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| 61 | * @return 1 on match, 0 otherwise. |
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| 62 | */ |
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| 63 | #define HT_COMPARE(page, asid, t) HT_COMPARE_ARCH(page, asid, t) |
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| 64 | |||
| 746 | jermar | 65 | /** Identify empty page hash table slots. |
| 699 | jermar | 66 | * |
| 67 | * @param t Pointer ro hash table typed pte_t *. |
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| 68 | * |
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| 69 | * @return 1 if the slot is empty, 0 otherwise. |
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| 70 | */ |
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| 71 | #define HT_SLOT_EMPTY(t) HT_SLOT_EMPTY_ARCH(t) |
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| 72 | |||
| 746 | jermar | 73 | /** Invalidate/empty page hash table slot. |
| 74 | * |
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| 75 | * @param t Address of the slot to be invalidated. |
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| 76 | */ |
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| 77 | #define HT_INVALIDATE_SLOT(t) HT_INVALIDATE_SLOT_ARCH(t) |
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| 78 | |||
| 699 | jermar | 79 | /** Return next record in collision chain. |
| 80 | * |
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| 81 | * @param t PTE. |
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| 82 | * |
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| 83 | * @return Successor of PTE or NULL. |
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| 84 | */ |
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| 85 | #define HT_GET_NEXT(t) HT_GET_NEXT_ARCH(t) |
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| 86 | |||
| 87 | /** Set successor in collision chain. |
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| 88 | * |
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| 89 | * @param t PTE. |
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| 90 | * @param s Successor or NULL. |
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| 91 | */ |
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| 92 | #define HT_SET_NEXT(t, s) HT_SET_NEXT_ARCH(t, s) |
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| 93 | |||
| 94 | /** Set page hash table record. |
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| 95 | * |
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| 96 | * @param t PTE. |
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| 97 | * @param page Virtual address. Only vpn bits will be used. |
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| 98 | * @param asid Address space identifier. |
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| 99 | * @param frame Physical address. Only pfn bits will be used. |
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| 100 | * @param flags Flags. See mm/page.h. |
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| 101 | */ |
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| 102 | #define HT_SET_RECORD(t, page, asid, frame, flags) HT_SET_RECORD_ARCH(t, page, asid, frame, flags) |
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| 103 | |||
| 684 | jermar | 104 | extern page_operations_t page_ht_operations; |
| 746 | jermar | 105 | extern spinlock_t page_ht_lock; |
| 684 | jermar | 106 | |
| 746 | jermar | 107 | extern pte_t *page_ht; |
| 108 | |||
| 109 | extern void ht_invalidate_all(void); |
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| 110 | |||
| 684 | jermar | 111 | #endif |