stride.hh revision 10053
1/* 2 * Copyright (c) 2012-2013 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_PREFETCHER_HH__ 49#define __MEM_CACHE_PREFETCH_STRIDE_PREFETCHER_HH__ 50 51#include <climits> 52 53#include "mem/cache/prefetch/base.hh" 54#include "params/StridePrefetcher.hh" 55 56class StridePrefetcher : public BasePrefetcher 57{ 58 protected: 59 60 static const int Max_Contexts = 64; 61 62 // These constants need to be changed with the type of the 63 // 'confidence' field below. 64 static const int Max_Conf = INT_MAX; 65 static const int Min_Conf = INT_MIN; 66 67 class StrideEntry 68 { 69 public: 70 Addr instAddr; 71 Addr missAddr; 72 bool isSecure; 73 int stride; 74 int confidence; 75 }; 76 77 std::list<StrideEntry*> table[Max_Contexts]; 78 79 bool instTagged; 80 81 public: 82 83 StridePrefetcher(const Params *p) 84 : BasePrefetcher(p), instTagged(p->inst_tagged) 85 { 86 } 87 88 ~StridePrefetcher() {} 89 90 void calculatePrefetch(PacketPtr &pkt, std::list<Addr> &addresses, 91 std::list<Cycles> &delays); 92}; 93 94#endif // __MEM_CACHE_PREFETCH_STRIDE_PREFETCHER_HH__ 95