tagged.cc revision 8066:cb7bf3919bdd
1/* 2 * Copyright (c) 2005 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Ron Dreslinski 29 */ 30 31/** 32 * @file 33 * Describes a tagged prefetcher based on template policies. 34 */ 35 36#include "mem/cache/prefetch/tagged.hh" 37 38TaggedPrefetcher::TaggedPrefetcher(const BaseCacheParams *p) 39 : BasePrefetcher(p), 40 latency(p->prefetch_latency), degree(p->prefetch_degree) 41{ 42} 43 44void 45TaggedPrefetcher:: 46calculatePrefetch(PacketPtr &pkt, std::list<Addr> &addresses, 47 std::list<Tick> &delays) 48{ 49 Addr blkAddr = pkt->getAddr() & ~(Addr)(blkSize-1); 50 51 for (int d = 1; d <= degree; d++) { 52 Addr newAddr = blkAddr + d*(blkSize); 53 if (pageStop && !samePage(blkAddr, newAddr)) { 54 // Spanned the page, so now stop 55 pfSpanPage += degree - d + 1; 56 return; 57 } else { 58 addresses.push_back(newAddr); 59 delays.push_back(latency); 60 } 61 } 62} 63 64 65