configs/common/Caches.py

   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
   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.
  12 #
  13 # Copyright (c) 2006-2007 The Regents of The University of Michigan
  14 # All rights reserved.
  15 #
  16 # Redistribution and use in source and binary forms, with or without
  17 # modification, are permitted provided that the following conditions are
  18 # met: redistributions of source code must retain the above copyright
  19 # notice, this list of conditions and the following disclaimer;
  20 # redistributions in binary form must reproduce the above copyright
  21 # notice, this list of conditions and the following disclaimer in the
  22 # documentation and/or other materials provided with the distribution;
  23 # neither the name of the copyright holders nor the names of its
  24 # contributors may be used to endorse or promote products derived from
  25 # this software without specific prior written permission.
  26 #
  27 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  28 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  29 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  30 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  31 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  32 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  33 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  34 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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  37 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  38 #
  39 # Authors: Lisa Hsu
  40
  41 from m5.defines import buildEnv
  42 from m5.objects import *
  43
  44 # Base implementations of L1, L2, IO and TLB-walker caches. There are
  45 # used in the regressions and also as base components in the
  46 # system-configuration scripts. The values are meant to serve as a
  47 # starting point, and specific parameters can be overridden in the
  48 # specific instantiations.
  49
  50 class L1Cache(Cache):
  51     assoc = 2
  52     tag_latency = 2
  53     data_latency = 2
  54     response_latency = 2
  55     mshrs = 4
  56     tgts_per_mshr = 20
  57
  58 class L1_ICache(L1Cache):
  59     is_read_only = True
  60     # Writeback clean lines as well
  61     writeback_clean = True
  62
  63 class L1_DCache(L1Cache):
  64     pass
  65
  66 class L2Cache(Cache):
  67     assoc = 8
  68     tag_latency = 20
  69     data_latency = 20
  70     response_latency = 20
  71     mshrs = 20
  72     tgts_per_mshr = 12
  73     write_buffers = 8
  74
  75 class IOCache(Cache):
  76     assoc = 8
  77     tag_latency = 50
  78     data_latency = 50
  79     response_latency = 50
  80     mshrs = 20
  81     size = '1kB'
  82     tgts_per_mshr = 12
  83
  84 class PageTableWalkerCache(Cache):
  85     assoc = 2
  86     tag_latency = 2
  87     data_latency = 2
  88     response_latency = 2
  89     mshrs = 10
  90     size = '1kB'
  91     tgts_per_mshr = 12
  92
  93     # the x86 table walker actually writes to the table-walker cache
  94     if buildEnv['TARGET_ISA'] == 'x86':
  95         is_read_only = False
  96     else:
  97         is_read_only = True
  98         # Writeback clean lines as well
  99         writeback_clean = True