src/mem/cache/tags/split_blk.hh

   1 /*
   2  * Copyright (c) 2004-2005 The Regents of The University of Michigan
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * Authors: Lisa Hsu
  29  */
  30
  31 /**
  32  * @file
  33  * Declaration of partitioned tag store cache block class.
  34  */
  35
  36 #ifndef __SPLIT_BLK_HH__
  37 #define __SPLIT_BLK_HH__
  38
  39 #include "mem/cache/cache_blk.hh" // base class
  40
  41 /**
  42  * Split cache block.
  43  */
  44 class SplitBlk : public CacheBlk {
  45   public:
  46     /** Has this block been touched? Used to aid calculation of warmup time. */
  47     bool isTouched;
  48     /** Has this block been used after being brought in? (for LIFO partition) */
  49     bool isUsed;
  50     /** is this blk a NIC block? (i.e. requested by the NIC) */
  51     bool isNIC;
  52     /** timestamp of the arrival of this block into the cache */
  53     Tick ts;
  54     /** the previous block in the LIFO partition (brought in before than me) */
  55     SplitBlk *prev;
  56     /** the next block in the LIFO partition (brought in later than me) */
  57     SplitBlk *next;
  58     /** which partition this block is in */
  59     int part;
  60
  61     SplitBlk()
  62         : isTouched(false), isUsed(false), isNIC(false), ts(0), prev(NULL), next(NULL),
  63           part(0)
  64     {}
  65 };
  66
  67 #endif
  68