75 lines
2.8 KiB
C++
75 lines
2.8 KiB
C++
/*
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* Copyright (c) 2005 The Regents of The University of Michigan
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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: Ron Dreslinski
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* Steve Reinhardt
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*/
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/**
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* @file
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* GHB Prefetcher implementation.
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*/
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#include "mem/cache/prefetch/ghb.hh"
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#include "arch/isa_traits.hh"
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void
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GHBPrefetcher::calculatePrefetch(PacketPtr &pkt, std::list<Addr> &addresses,
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std::list<Tick> &delays)
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{
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Addr blkAddr = pkt->getAddr() & ~(Addr)(this->blkSize-1);
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int cpuID = pkt->req->getCpuNum();
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if (!useCPUId) cpuID = 0;
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int new_stride = blkAddr - last_miss_addr[cpuID];
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int old_stride = last_miss_addr[cpuID] -
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second_last_miss_addr[cpuID];
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second_last_miss_addr[cpuID] = last_miss_addr[cpuID];
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last_miss_addr[cpuID] = blkAddr;
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if (new_stride == old_stride) {
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for (int d=1; d <= degree; d++) {
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Addr newAddr = blkAddr + d * new_stride;
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if (this->pageStop &&
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(blkAddr & ~(TheISA::VMPageSize - 1)) !=
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(newAddr & ~(TheISA::VMPageSize - 1)))
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{
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//Spanned the page, so now stop
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this->pfSpanPage += degree - d + 1;
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return;
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}
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else
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{
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addresses.push_back(newAddr);
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delays.push_back(latency);
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}
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}
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}
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}
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