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/*
* Copyright (c) 2007 Mark D. Hill and David A. Wood
* 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.
*/
#ifndef __MEM_RUBY_STRUCTURES_ABSTRACTREPLACEMENTPOLICY_HH__
#define __MEM_RUBY_STRUCTURES_ABSTRACTREPLACEMENTPOLICY_HH__
#include "base/types.hh"
#include "mem/ruby/common/TypeDefines.hh"
#include "params/ReplacementPolicy.hh"
#include "sim/sim_object.hh"
class AbstractReplacementPolicy : public SimObject
{
public:
typedef ReplacementPolicyParams Params;
AbstractReplacementPolicy(const Params * p);
virtual ~AbstractReplacementPolicy();
/* touch a block. a.k.a. update timestamp */
virtual void touch(int64 set, int64 way, Tick time) = 0;
/* returns the way to replace */
virtual int64 getVictim(int64 set) const = 0;
/* get the time of the last access */
Tick getLastAccess(int64 set, int64 way);
virtual bool useOccupancy() const { return false; }
protected:
unsigned m_num_sets; /** total number of sets */
unsigned m_assoc; /** set associativity */
Tick **m_last_ref_ptr; /** timestamp of last reference */
};
#endif // __MEM_RUBY_STRUCTURES_ABSTRACTREPLACEMENTPOLICY_HH__
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