1 # Copyright (c) 2012-2013 ARM Limited
4 # The license below extends only to copyright in the software and shall
5 # not be construed as granting a license to any other intellectual
6 # property including but not limited to intellectual property relating
7 # to a hardware implementation of the functionality of the software
8 # licensed hereunder. You may use the software subject to the license
9 # terms below provided that you ensure that this notice is replicated
10 # unmodified and in its entirety in all distributions of the software,
11 # modified or unmodified, in source code or in binary form.
13 # Redistribution and use in source and binary forms, with or without
14 # modification, are permitted provided that the following conditions are
15 # met: redistributions of source code must retain the above copyright
16 # notice, this list of conditions and the following disclaimer;
17 # redistributions in binary form must reproduce the above copyright
18 # notice, this list of conditions and the following disclaimer in the
19 # documentation and/or other materials provided with the distribution;
20 # neither the name of the copyright holders nor the names of its
21 # contributors may be used to endorse or promote products derived from
22 # this software without specific prior written permission.
24 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
25 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
26 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
27 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
28 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
29 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
30 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
34 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 # Authors: Prakash Ramrakhyani
38 from m5
.params
import *
39 from m5
.proxy
import *
40 from ClockedObject
import ClockedObject
41 from IndexingPolicies
import *
43 class BaseTags(ClockedObject
):
46 cxx_header
= "mem/cache/tags/base.hh"
47 # Get the size from the parent (cache)
48 size
= Param
.MemorySize(Parent
.size
, "capacity in bytes")
50 # Get the block size from the parent (system)
51 block_size
= Param
.Int(Parent
.cache_line_size
, "block size in bytes")
53 # Get the tag lookup latency from the parent (cache)
54 tag_latency
= Param
.Cycles(Parent
.tag_latency
,
55 "The tag lookup latency for this cache")
57 # Get the RAM access latency from the parent (cache)
58 data_latency
= Param
.Cycles(Parent
.data_latency
,
59 "The data access latency for this cache")
61 # Get the warmup percentage from the parent (cache)
62 warmup_percentage
= Param
.Percent(Parent
.warmup_percentage
,
63 "Percentage of tags to be touched to warm up the cache")
65 sequential_access
= Param
.Bool(Parent
.sequential_access
,
66 "Whether to access tags and data sequentially")
69 indexing_policy
= Param
.BaseIndexingPolicy(SetAssociative(),
72 # Set the indexing entry size as the block size
73 entry_size
= Param
.Int(Parent
.cache_line_size
,
74 "Indexing entry size in bytes")
76 class BaseSetAssoc(BaseTags
):
78 cxx_header
= "mem/cache/tags/base_set_assoc.hh"
80 # Get the cache associativity
81 assoc
= Param
.Int(Parent
.assoc
, "associativity")
83 # Get replacement policy from the parent (cache)
84 replacement_policy
= Param
.BaseReplacementPolicy(
85 Parent
.replacement_policy
, "Replacement policy")
87 class SectorTags(BaseTags
):
89 cxx_header
= "mem/cache/tags/sector_tags.hh"
91 # Get the cache associativity
92 assoc
= Param
.Int(Parent
.assoc
, "associativity")
94 # Number of sub-sectors (data blocks) per sector
95 num_blocks_per_sector
= Param
.Int(1, "Number of sub-sectors per sector");
97 # The indexing entry now is a sector block
98 entry_size
= Parent
.cache_line_size
* Self
.num_blocks_per_sector
100 # Get replacement policy from the parent (cache)
101 replacement_policy
= Param
.BaseReplacementPolicy(
102 Parent
.replacement_policy
, "Replacement policy")
104 class FALRU(BaseTags
):
107 cxx_header
= "mem/cache/tags/fa_lru.hh"
109 min_tracked_cache_size
= Param
.MemorySize("128kB", "Minimum cache size for"
110 " which we track statistics")
112 # This tag uses its own embedded indexing
113 indexing_policy
= NULL