tagged.cc revision 5337:f81512eb8bdf 
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 "arch/isa_traits.hh"
37#include "mem/cache/prefetch/tagged_prefetcher.hh"
38
39TaggedPrefetcher::TaggedPrefetcher(const BaseCacheParams *p)
40    : BasePrefetcher(p),
41      latency(p->prefetch_latency), degree(p->prefetch_degree)
42{
43}
44
45void
46TaggedPrefetcher::
47calculatePrefetch(PacketPtr &pkt, std::list<Addr> &addresses,
48                  std::list<Tick> &delays)
49{
50    Addr blkAddr = pkt->getAddr() & ~(Addr)(this->blkSize-1);
51
52    for (int d=1; d <= degree; d++) {
53        Addr newAddr = blkAddr + d*(this->blkSize);
54        if (this->pageStop &&
55            (blkAddr & ~(TheISA::VMPageSize - 1)) !=
56            (newAddr & ~(TheISA::VMPageSize - 1)))
57        {
58            //Spanned the page, so now stop
59            this->pfSpanPage += degree - d + 1;
60            return;
61        }
62        else
63        {
64            addresses.push_back(newAddr);
65            delays.push_back(latency);
66        }
67    }
68}
69
70
71