1 # Copyright (c) 2012, 2014 ARM Limited
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13 # Copyright (c) 2005 The Regents of The University of Michigan
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25 # this software without specific prior written permission.
27 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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39 # Authors: Ron Dreslinski
42 from ClockedObject
import ClockedObject
43 from m5
.params
import *
44 from m5
.proxy
import *
46 class BasePrefetcher(ClockedObject
):
47 type = 'BasePrefetcher'
49 cxx_header
= "mem/cache/prefetch/base.hh"
50 sys
= Param
.System(Parent
.any
, "System this prefetcher belongs to")
52 on_miss
= Param
.Bool(False, "Only notify prefetcher on misses")
53 on_read
= Param
.Bool(True, "Notify prefetcher on reads")
54 on_write
= Param
.Bool(True, "Notify prefetcher on writes")
55 on_data
= Param
.Bool(True, "Notify prefetcher on data accesses")
56 on_inst
= Param
.Bool(True, "Notify prefetcher on instruction accesses")
58 class QueuedPrefetcher(BasePrefetcher
):
59 type = "QueuedPrefetcher"
61 cxx_class
= "QueuedPrefetcher"
62 cxx_header
= "mem/cache/prefetch/queued.hh"
63 latency
= Param
.Int(1, "Latency for generated prefetches")
64 queue_size
= Param
.Int(32, "Maximum number of queued prefetches")
65 queue_squash
= Param
.Bool(True, "Squash queued prefetch on demand access")
66 queue_filter
= Param
.Bool(True, "Don't queue redundant prefetches")
67 cache_snoop
= Param
.Bool(False, "Snoop cache to eliminate redundant request")
69 tag_prefetch
= Param
.Bool(True, "Tag prefetch with PC of generating access")
71 class StridePrefetcher(QueuedPrefetcher
):
72 type = 'StridePrefetcher'
73 cxx_class
= 'StridePrefetcher'
74 cxx_header
= "mem/cache/prefetch/stride.hh"
76 max_conf
= Param
.Int(7, "Maximum confidence level")
77 thresh_conf
= Param
.Int(4, "Threshold confidence level")
78 min_conf
= Param
.Int(0, "Minimum confidence level")
79 start_conf
= Param
.Int(4, "Starting confidence for new entries")
81 table_sets
= Param
.Int(16, "Number of sets in PC lookup table")
82 table_assoc
= Param
.Int(4, "Associativity of PC lookup table")
83 use_master_id
= Param
.Bool(True, "Use master id based history")
85 degree
= Param
.Int(4, "Number of prefetches to generate")
87 class TaggedPrefetcher(QueuedPrefetcher
):
88 type = 'TaggedPrefetcher'
89 cxx_class
= 'TaggedPrefetcher'
90 cxx_header
= "mem/cache/prefetch/tagged.hh"
92 degree
= Param
.Int(2, "Number of prefetches to generate")