a120af889b
ReplaceableEntry is referenced by many classes that do not necessarily need access to the replacement policies. Therefore, in order to allow better compilation units, we factor it out to a new file. Change-Id: I0823567bf1ca336ffcdf783682ef473e8878d7fd Signed-off-by: Daniel R. Carvalho <odanrc@yahoo.com.br> Reviewed-on: https://gem5-review.googlesource.com/c/13418 Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com> Maintainer: Nikos Nikoleris <nikos.nikoleris@arm.com>
100 lines
3.3 KiB
C++
100 lines
3.3 KiB
C++
/**
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* Copyright (c) 2018 Inria
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Daniel Carvalho
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*/
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#ifndef __MEM_CACHE_REPLACEMENT_POLICIES_REPLACEABLE_ENTRY_HH__
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#define __MEM_CACHE_REPLACEMENT_POLICIES_REPLACEABLE_ENTRY_HH__
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#include <cstdint>
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#include <memory>
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/**
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* The replacement data needed by replacement policies. Each replacement policy
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* should have its own implementation of replacement data.
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*/
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struct ReplacementData {};
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/**
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* A replaceable entry is a basic entry in a 2d table-like structure that needs
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* to have replacement functionality. This entry is located in a specific row
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* and column of the table (set and way in cache nomenclature), which are
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* stored within the entry itself.
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*
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* It contains the replacement data pointer, which must be instantiated by the
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* replacement policy before being used.
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* @sa Replacement Policies
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*/
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class ReplaceableEntry
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{
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private:
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/**
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* Set to which this entry belongs.
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*/
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uint32_t _set;
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/**
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* Way (relative position within the set) to which this entry belongs.
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*/
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uint32_t _way;
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public:
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/**
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* Replacement data associated to this entry.
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* It must be instantiated by the replacement policy before being used.
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*/
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std::shared_ptr<ReplacementData> replacementData;
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/**
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* Set both the set and way. Should be called only once.
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*
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* @param set The set of this entry.
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* @param way The way of this entry.
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*/
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void setPosition(const uint32_t set, const uint32_t way) {
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_set = set;
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_way = way;
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}
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/**
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* Get set number.
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*
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* @return The set to which this entry belongs.
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*/
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uint32_t getSet() const { return _set; }
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/**
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* Get way number.
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*
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* @return The way to which this entry belongs.
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*/
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uint32_t getWay() const { return _way; }
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};
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#endif // __MEM_CACHE_REPLACEMENT_POLICIES_REPLACEABLE_ENTRY_HH_
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