AbstractReplacementPolicy.hh revision 10970
1/* 2 * Copyright (c) 2007 Mark D. Hill and David A. Wood 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 29#ifndef __MEM_RUBY_STRUCTURES_ABSTRACTREPLACEMENTPOLICY_HH__ 30#define __MEM_RUBY_STRUCTURES_ABSTRACTREPLACEMENTPOLICY_HH__ 31 32#include "base/types.hh" 33#include "mem/ruby/common/TypeDefines.hh" 34#include "params/ReplacementPolicy.hh" 35#include "sim/sim_object.hh" 36 37class AbstractReplacementPolicy : public SimObject 38{ 39 public: 40 typedef ReplacementPolicyParams Params; 41 AbstractReplacementPolicy(const Params * p); 42 virtual ~AbstractReplacementPolicy(); 43 44 /* touch a block. a.k.a. update timestamp */ 45 virtual void touch(int64 set, int64 way, Tick time) = 0; 46 47 /* returns the way to replace */ 48 virtual int64 getVictim(int64 set) const = 0; 49 50 /* get the time of the last access */ 51 Tick getLastAccess(int64 set, int64 way); 52 53 virtual bool useOccupancy() const { return false; } 54 55 protected: 56 unsigned m_num_sets; /** total number of sets */ 57 unsigned m_assoc; /** set associativity */ 58 Tick **m_last_ref_ptr; /** timestamp of last reference */ 59}; 60 61#endif // __MEM_RUBY_STRUCTURES_ABSTRACTREPLACEMENTPOLICY_HH__ 62