AbstractReplacementPolicy.hh revision 7008
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 ABSTRACTREPLACEMENTPOLICY_H 30#define ABSTRACTREPLACEMENTPOLICY_H 31 32#include "mem/ruby/common/Global.hh" 33 34class AbstractReplacementPolicy { 35 36public: 37 38 AbstractReplacementPolicy(Index num_sets, Index assoc); 39 virtual ~AbstractReplacementPolicy(); 40 41 /* touch a block. a.k.a. update timestamp */ 42 virtual void touch(Index set, Index way, Time time) = 0; 43 44 /* returns the way to replace */ 45 virtual Index getVictim(Index set) const = 0; 46 47 /* get the time of the last access */ 48 Time getLastAccess(Index set, Index way); 49 50 protected: 51 unsigned int m_num_sets; /** total number of sets */ 52 unsigned int m_assoc; /** set associativity */ 53 Time **m_last_ref_ptr; /** timestamp of last reference */ 54}; 55 56inline 57AbstractReplacementPolicy::AbstractReplacementPolicy(Index num_sets, Index assoc) 58{ 59 m_num_sets = num_sets; 60 m_assoc = assoc; 61 m_last_ref_ptr = new Time*[m_num_sets]; 62 for(unsigned int i = 0; i < m_num_sets; i++){ 63 m_last_ref_ptr[i] = new Time[m_assoc]; 64 for(unsigned int j = 0; j < m_assoc; j++){ 65 m_last_ref_ptr[i][j] = 0; 66 } 67 } 68} 69 70inline 71AbstractReplacementPolicy::~AbstractReplacementPolicy() 72{ 73 if(m_last_ref_ptr != NULL){ 74 for(unsigned int i = 0; i < m_num_sets; i++){ 75 if(m_last_ref_ptr[i] != NULL){ 76 delete[] m_last_ref_ptr[i]; 77 } 78 } 79 delete[] m_last_ref_ptr; 80 } 81} 82 83inline 84Time AbstractReplacementPolicy::getLastAccess(Index set, Index way) 85{ 86 return m_last_ref_ptr[set][way]; 87} 88 89#endif // ABSTRACTREPLACEMENTPOLICY_H 90