| 1 | /*
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| 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 |
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| 29 | /*
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| 30 | * This is the generic page hash table interface.
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| 31 | * Architectures that use single page hash table for
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| 32 | * storing page translations must implement it.
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| 33 | */
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| 34 |
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| 35 | #ifndef __PAGE_HT_H__
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| 36 | #define __PAGE_HT_H__
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| 37 |
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| 38 | #include <mm/page.h>
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| 39 |
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| 40 | /** Hash function.
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| 41 | *
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| 42 | * @param page Virtual address. Only vpn bits will be used.
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| 43 | * @param asid Address space identifier.
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| 44 | *
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| 45 | * @return Pointer to hash table typed pte_t *.
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| 46 | */
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| 47 | #define HT_HASH(page, asid) HT_HASH_ARCH(page, asid)
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| 48 |
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| 49 | /** Compare PTE with page and asid.
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| 50 | *
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| 51 | * @param page Virtual address. Only vpn bits will be used.
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| 52 | * @param asid Address space identifier.
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| 53 | * @param t PTE.
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| 54 | *
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| 55 | * @return 1 on match, 0 otherwise.
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| 56 | */
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| 57 | #define HT_COMPARE(page, asid, t) HT_COMPARE_ARCH(page, asid, t)
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| 58 |
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| 59 | /** Identify empty hash table slots.
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| 60 | *
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| 61 | * @param t Pointer ro hash table typed pte_t *.
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| 62 | *
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| 63 | * @return 1 if the slot is empty, 0 otherwise.
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| 64 | */
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| 65 | #define HT_SLOT_EMPTY(t) HT_SLOT_EMPTY_ARCH(t)
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| 66 |
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| 67 | /** Return next record in collision chain.
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| 68 | *
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| 69 | * @param t PTE.
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| 70 | *
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| 71 | * @return Successor of PTE or NULL.
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| 72 | */
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| 73 | #define HT_GET_NEXT(t) HT_GET_NEXT_ARCH(t)
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| 74 |
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| 75 | /** Set successor in collision chain.
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| 76 | *
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| 77 | * @param t PTE.
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| 78 | * @param s Successor or NULL.
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| 79 | */
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| 80 | #define HT_SET_NEXT(t, s) HT_SET_NEXT_ARCH(t, s)
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| 81 |
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| 82 | /** Set page hash table record.
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| 83 | *
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| 84 | * @param t PTE.
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| 85 | * @param page Virtual address. Only vpn bits will be used.
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| 86 | * @param asid Address space identifier.
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| 87 | * @param frame Physical address. Only pfn bits will be used.
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| 88 | * @param flags Flags. See mm/page.h.
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| 89 | */
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| 90 | #define HT_SET_RECORD(t, page, asid, frame, flags) HT_SET_RECORD_ARCH(t, page, asid, frame, flags)
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| 91 |
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| 92 | extern page_operations_t page_ht_operations;
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| 93 |
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| 94 | #endif
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