src/mem/cache/tags/random_repl.hh

   1 /*
   2  * Copyright (c) 2014 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: Anthony Gutierrez
  29  */
  30
  31 /**
  32  * @file
  33  * Declaration of a random replacement tag store.
  34  * The RandomRepl tags first try to evict an invalid
  35  * block. If no invalid blocks are found, a candidate
  36  * for eviction is found at random.
  37  */
  38
  39 #ifndef __MEM_CACHE_TAGS_RANDOM_REPL_HH__
  40 #define __MEM_CACHE_TAGS_RANDOM_REPL_HH__
  41
  42 #include "mem/cache/tags/base_set_assoc.hh"
  43 #include "params/RandomRepl.hh"
  44
  45 class RandomRepl : public BaseSetAssoc
  46 {
  47   public:
  48     /** Convenience typedef. */
  49     typedef RandomReplParams Params;
  50
  51     /**
  52      * Construct and initiliaze this tag store.
  53      */
  54     RandomRepl(const Params *p);
  55
  56     /**
  57      * Destructor
  58      */
  59     ~RandomRepl() {}
  60
  61     CacheBlk* accessBlock(Addr addr, bool is_secure, Cycles &lat);
  62     CacheBlk* findVictim(Addr addr);
  63     void insertBlock(PacketPtr pkt, BlkType *blk);
  64     void invalidate(CacheBlk *blk);
  65 };
  66
  67 #endif // __MEM_CACHE_TAGS_RANDOM_REPL_HH__