Caches.py revision 11199 
1# Copyright (c) 2012 ARM Limited
2# All rights reserved.
3#
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
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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) 2006-2007 The Regents of The University of Michigan
14# All rights reserved.
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17# modification, are permitted provided that the following conditions are
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27# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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38#
39# Authors: Lisa Hsu
40
41from m5.objects import *
42
43# Base implementations of L1, L2, IO and TLB-walker caches. There are
44# used in the regressions and also as base components in the
45# system-configuration scripts. The values are meant to serve as a
46# starting point, and specific parameters can be overridden in the
47# specific instantiations.
48
49class L1Cache(Cache):
50    assoc = 2
51    hit_latency = 2
52    response_latency = 2
53    mshrs = 4
54    tgts_per_mshr = 20
55
56class L1_ICache(L1Cache):
57    is_read_only = True
58    # Writeback clean lines as well
59    writeback_clean = True
60
61class L1_DCache(L1Cache):
62    pass
63
64class L2Cache(Cache):
65    assoc = 8
66    hit_latency = 20
67    response_latency = 20
68    mshrs = 20
69    tgts_per_mshr = 12
70    write_buffers = 8
71
72class IOCache(Cache):
73    assoc = 8
74    hit_latency = 50
75    response_latency = 50
76    mshrs = 20
77    size = '1kB'
78    tgts_per_mshr = 12
79    forward_snoops = False
80
81class PageTableWalkerCache(Cache):
82    assoc = 2
83    hit_latency = 2
84    response_latency = 2
85    mshrs = 10
86    size = '1kB'
87    tgts_per_mshr = 12
88    forward_snoops = False
89    # the x86 table walker actually writes to the table-walker cache
90    if buildEnv['TARGET_ISA'] == 'x86':
91        is_read_only = False
92    else:
93        is_read_only = True
94        # Writeback clean lines as well
95        writeback_clean = True
96