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/*
* Copyright (c) 2012-2013, 2015 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Copyright (c) 2005 The Regents of The University of Michigan
* 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.
*
* Authors: Ron Dreslinski
*/
/**
* @file
* Describes a strided prefetcher.
*/
#ifndef __MEM_CACHE_PREFETCH_STRIDE_HH__
#define __MEM_CACHE_PREFETCH_STRIDE_HH__
#include <unordered_map>
#include "mem/cache/prefetch/queued.hh"
#include "params/StridePrefetcher.hh"
class StridePrefetcher : public QueuedPrefetcher
{
protected:
const int maxConf;
const int threshConf;
const int minConf;
const int startConf;
const int pcTableAssoc;
const int pcTableSets;
const bool useMasterId;
const int degree;
struct StrideEntry
{
StrideEntry() : instAddr(0), lastAddr(0), isSecure(false), stride(0),
confidence(0)
{ }
Addr instAddr;
Addr lastAddr;
bool isSecure;
int stride;
int confidence;
};
class PCTable
{
public:
PCTable(int assoc, int sets, const std::string name) :
pcTableAssoc(assoc), pcTableSets(sets), _name(name) {}
StrideEntry** operator[] (int context) {
auto it = entries.find(context);
if (it != entries.end())
return it->second;
return allocateNewContext(context);
}
~PCTable();
private:
const std::string name() {return _name; }
const int pcTableAssoc;
const int pcTableSets;
const std::string _name;
std::unordered_map<int, StrideEntry**> entries;
StrideEntry** allocateNewContext(int context);
};
PCTable pcTable;
bool pcTableHit(Addr pc, bool is_secure, int master_id, StrideEntry* &entry);
StrideEntry* pcTableVictim(Addr pc, int master_id);
Addr pcHash(Addr pc) const;
public:
StridePrefetcher(const StridePrefetcherParams *p);
void calculatePrefetch(const PacketPtr &pkt, std::vector<Addr> &addresses);
};
#endif // __MEM_CACHE_PREFETCH_STRIDE_HH__
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