Prefetcher.py revision 9288 
1# Copyright (c) 2012 ARM Limited
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13# Copyright (c) 2005 The Regents of The University of Michigan
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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    size = Param.Int(100,
49         "Number of entries in the hardware prefetch queue")
50    cross_pages = Param.Bool(False,
51         "Allow prefetches to cross virtual page boundaries")
52    serial_squash = Param.Bool(False,
53         "Squash prefetches with a later time on a subsequent miss")
54    degree = Param.Int(1,
55         "Degree of the prefetch depth")
56    latency = Param.Cycles('1', "Latency of the prefetcher")
57    use_master_id = Param.Bool(True,
58         "Use the master id to separate calculations of prefetches")
59    data_accesses_only = Param.Bool(False,
60         "Only prefetch on data not on instruction accesses")
61    sys = Param.System(Parent.any, "System this device belongs to")
62
63class GHBPrefetcher(BasePrefetcher):
64    type = 'GHBPrefetcher'
65    cxx_class = 'GHBPrefetcher'
66
67class StridePrefetcher(BasePrefetcher):
68    type = 'StridePrefetcher'
69    cxx_class = 'StridePrefetcher'
70
71class TaggedPrefetcher(BasePrefetcher):
72    type = 'TaggedPrefetcher'
73    cxx_class = 'TaggedPrefetcher'
74
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