gem5/src/mem/cache/tags/cacheset.hh

/*
 * Copyright (c) 2009 The Regents of The University of Michigan
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Authors: Lisa Hsu
 */

/**
 * @file
 * Declaration of an associative set
 */

#ifndef __CACHESET_HH__
#define __CACHESET_HH__

#include <cassert>

#include "mem/cache/blk.hh" // base class

/**
 * An associative set of cache blocks.
 */
class CacheSet
{
  public:
    /** The associativity of this set. */
    int assoc;

    /** Cache blocks in this set, maintained in LRU order 0 = MRU. */
    CacheBlk **blks;

    /**
     * Find a block matching the tag in this set.
     * @param asid The address space ID.
     * @param tag The Tag to find.
     * @return Pointer to the block if found.
     */
    CacheBlk* findBlk(Addr tag) const;

    /**
     * Move the given block to the head of the list.
     * @param blk The block to move.
     */
    void moveToHead(CacheBlk *blk);

    /**
     * Move the given block to the tail of the list.
     * @param blk The block to move
     */
    void moveToTail(CacheBlk *blk);

};

#endif