Prefetcher.py revision 9338 
1# Copyright (c) 2012 ARM Limited
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3#
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8# licensed hereunder.  You may use the software subject to the license
9# terms below provided that you ensure that this notice is replicated
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11# modified or unmodified, in source code or in binary form.
12#
13# Copyright (c) 2005 The Regents of The University of Michigan
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27# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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38#
39# Authors: Ron Dreslinski
40
41from ClockedObject import ClockedObject
42from m5.params import *
43from m5.proxy import *
44
45class BasePrefetcher(ClockedObject):
46    type = 'BasePrefetcher'
47    abstract = True
48    cxx_header = "mem/cache/prefetch/base.hh"
49    size = Param.Int(100,
50         "Number of entries in the hardware prefetch queue")
51    cross_pages = Param.Bool(False,
52         "Allow prefetches to cross virtual page boundaries")
53    serial_squash = Param.Bool(False,
54         "Squash prefetches with a later time on a subsequent miss")
55    degree = Param.Int(1,
56         "Degree of the prefetch depth")
57    latency = Param.Cycles('1', "Latency of the prefetcher")
58    use_master_id = Param.Bool(True,
59         "Use the master id to separate calculations of prefetches")
60    data_accesses_only = Param.Bool(False,
61         "Only prefetch on data not on instruction accesses")
62    sys = Param.System(Parent.any, "System this device belongs to")
63
64class GHBPrefetcher(BasePrefetcher):
65    type = 'GHBPrefetcher'
66    cxx_class = 'GHBPrefetcher'
67    cxx_header = "mem/cache/prefetch/ghb.hh"
68
69class StridePrefetcher(BasePrefetcher):
70    type = 'StridePrefetcher'
71    cxx_class = 'StridePrefetcher'
72    cxx_header = "mem/cache/prefetch/stride.hh"
73
74class TaggedPrefetcher(BasePrefetcher):
75    type = 'TaggedPrefetcher'
76    cxx_class = 'TaggedPrefetcher'
77    cxx_header = "mem/cache/prefetch/tagged.hh"
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