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684 jermar 1 
/*
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 * Copyright (C) 2006 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/*
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 * This is the generic page hash table interface.
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 * Architectures that use single page hash table for
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 * storing page translations must implement it.
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 */
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#ifndef __PAGE_HT_H__
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#define __PAGE_HT_H__
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#include <mm/page.h>
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/** Hash function.
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 *
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 * @param page Virtual address. Only vpn bits will be used.
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 * @param asid Address space identifier.
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 *
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 * @return Pointer to hash table typed pte_t *.
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 */
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#define HT_HASH(page, asid)     HT_HASH_ARCH(page, asid)
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/** Compare PTE with page and asid.
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 *
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 * @param page Virtual address. Only vpn bits will be used.
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 * @param asid Address space identifier.
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 * @param t PTE.
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 *
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 * @return 1 on match, 0 otherwise.
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 */
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#define HT_COMPARE(page, asid, t)   HT_COMPARE_ARCH(page, asid, t)
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/** Identify empty hash table slots.
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 *
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 * @param t Pointer ro hash table typed pte_t *.
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 *
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 * @return 1 if the slot is empty, 0 otherwise.
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 */
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#define HT_SLOT_EMPTY(t)        HT_SLOT_EMPTY_ARCH(t)
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/** Return next record in collision chain.
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 *
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 * @param t PTE.
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 *
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 * @return Successor of PTE or NULL.
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 */
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#define HT_GET_NEXT(t)          HT_GET_NEXT_ARCH(t)
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/** Set successor in collision chain.
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 *
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 * @param t PTE.
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 * @param s Successor or NULL.
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 */
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#define HT_SET_NEXT(t, s)       HT_SET_NEXT_ARCH(t, s)
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/** Set page hash table record.
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 *
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 * @param t PTE.
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 * @param page Virtual address. Only vpn bits will be used.
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 * @param asid Address space identifier.
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 * @param frame Physical address. Only pfn bits will be used.
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 * @param flags Flags. See mm/page.h.
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 */
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#define HT_SET_RECORD(t, page, asid, frame, flags)  HT_SET_RECORD_ARCH(t, page, asid, frame, flags)
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extern page_operations_t page_ht_operations;
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#endif