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756 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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#include <genarch/mm/as_ht.h>
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#include <genarch/mm/page_ht.h>
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#include <mm/as.h>
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#include <mm/frame.h>
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#include <arch/types.h>
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#include <typedefs.h>
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#include <memstr.h>
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static pte_t *ht_create(int flags);
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as_operations_t as_ht_operations = {
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    .page_table_create = ht_create
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};
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/** Page hash table create.
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 *
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 * The page hash table will be created only once
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 * and will be shared by all address spaces.
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 *
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 * @param flags Ignored.
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 *
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 * @return Address of global page hash table.
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 */
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pte_t *ht_create(int flags)
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{
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    if (!page_ht) {
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        page_ht = (pte_t *) frame_alloc(HT_WIDTH - FRAME_WIDTH, FRAME_KA | FRAME_PANIC);
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        memsetb((__address) page_ht, HT_SIZE, 0);
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    }
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    return page_ht;
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}