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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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/**
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 * @file    as_ht.c
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 * @brief   Address space functions for global page hash table.
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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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#include <adt/hash_table.h>
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#include <synch/mutex.h>
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static pte_t *ht_create(int flags);
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static void ht_destroy(pte_t *page_table);
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static void ht_lock(as_t *as, bool lock);
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static void ht_unlock(as_t *as, bool unlock);
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as_operations_t as_ht_operations = {
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    .page_table_create = ht_create,
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    .page_table_destroy = ht_destroy,
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    .page_table_lock = ht_lock,
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    .page_table_unlock = ht_unlock,
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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 Returns NULL.
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 */
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pte_t *ht_create(int flags)
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{
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    if (flags & FLAG_AS_KERNEL) {
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        hash_table_create(&page_ht, PAGE_HT_ENTRIES, 2, &ht_operations);
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        mutex_initialize(&page_ht_lock);
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    }
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    return NULL;
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}
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/** Destroy page table.
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 *
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 * Actually do nothing as the global page hash table is used.
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 *
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 * @param page_table This parameter is ignored.
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 */
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void ht_destroy(pte_t *page_table)
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{
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    /* No-op. */
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}
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/** Lock page table.
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 *
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 * Lock address space and page hash table.
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 * Interrupts must be disabled.
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 *
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 * @param as Address space.
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 * @param lock If false, do not attempt to lock the address space.
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 */
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void ht_lock(as_t *as, bool lock)
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{
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    if (lock)
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        mutex_lock(&as->lock);
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    mutex_lock(&page_ht_lock);
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}
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/** Unlock page table.
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 *
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 * Unlock address space and page hash table.
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 * Interrupts must be disabled.
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 *
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 * @param as Address space.
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 * @param unlock If false, do not attempt to lock the address space.
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 */
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void ht_unlock(as_t *as, bool unlock)
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{
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    mutex_unlock(&page_ht_lock);
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    if (unlock)
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        mutex_unlock(&as->lock);
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}