stride.hh revision 10771:ea35886cd847
1/* 2 * Copyright (c) 2012-2013, 2015 ARM Limited 3 * All rights reserved 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software 9 * licensed hereunder. You may use the software subject to the license 10 * terms below provided that you ensure that this notice is replicated 11 * unmodified and in its entirety in all distributions of the software, 12 * modified or unmodified, in source code or in binary form. 13 * 14 * Copyright (c) 2005 The Regents of The University of Michigan 15 * All rights reserved. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions are 19 * met: redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer; 21 * redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution; 24 * neither the name of the copyright holders nor the names of its 25 * contributors may be used to endorse or promote products derived from 26 * this software without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 39 * 40 * Authors: Ron Dreslinski 41 */ 42 43/** 44 * @file 45 * Describes a strided prefetcher. 46 */ 47 48#ifndef __MEM_CACHE_PREFETCH_STRIDE_HH__ 49#define __MEM_CACHE_PREFETCH_STRIDE_HH__ 50 51#include "base/hashmap.hh" 52#include "mem/cache/prefetch/queued.hh" 53#include "params/StridePrefetcher.hh" 54 55class StridePrefetcher : public QueuedPrefetcher 56{ 57 protected: 58 const int maxConf; 59 const int threshConf; 60 const int minConf; 61 const int startConf; 62 63 const int pcTableAssoc; 64 const int pcTableSets; 65 66 const bool useMasterId; 67 68 const int degree; 69 70 struct StrideEntry 71 { 72 StrideEntry() : instAddr(0), lastAddr(0), isSecure(false), stride(0), 73 confidence(0) 74 { } 75 76 Addr instAddr; 77 Addr lastAddr; 78 bool isSecure; 79 int stride; 80 int confidence; 81 }; 82 83 class PCTable 84 { 85 public: 86 PCTable(int assoc, int sets, const std::string name) : 87 pcTableAssoc(assoc), pcTableSets(sets), _name(name) {} 88 StrideEntry** operator[] (int context) { 89 auto it = entries.find(context); 90 if (it != entries.end()) 91 return it->second; 92 93 return allocateNewContext(context); 94 } 95 96 ~PCTable(); 97 private: 98 const std::string name() {return _name; } 99 const int pcTableAssoc; 100 const int pcTableSets; 101 const std::string _name; 102 m5::hash_map<int, StrideEntry**> entries; 103 104 StrideEntry** allocateNewContext(int context); 105 }; 106 PCTable pcTable; 107 108 bool pcTableHit(Addr pc, bool is_secure, int master_id, StrideEntry* &entry); 109 StrideEntry* pcTableVictim(Addr pc, int master_id); 110 111 Addr pcHash(Addr pc) const; 112 public: 113 114 StridePrefetcher(const StridePrefetcherParams *p); 115 116 void calculatePrefetch(const PacketPtr &pkt, std::vector<Addr> &addresses); 117}; 118 119#endif // __MEM_CACHE_PREFETCH_STRIDE_HH__ 120