stride.hh revision 10053:b0b69dbafc08 
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