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
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  30 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  31 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  33 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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  37 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  38
  39 from __future__ import print_function
  40 from __future__ import absolute_import
  41
  42 from m5.defines import buildEnv
  43 from m5.objects import *
  44
  45 # Base implementations of L1, L2, IO and TLB-walker caches. There are
  46 # used in the regressions and also as base components in the
  47 # system-configuration scripts. The values are meant to serve as a
  48 # starting point, and specific parameters can be overridden in the
  49 # specific instantiations.
  50
  51 class L1Cache(Cache):
  52     assoc = 2
  53     tag_latency = 2
  54     data_latency = 2
  55     response_latency = 2
  56     mshrs = 4
  57     tgts_per_mshr = 20
  58
  59 class L1_ICache(L1Cache):
  60     is_read_only = True
  61     # Writeback clean lines as well
  62     writeback_clean = True
  63
  64 class L1_DCache(L1Cache):
  65     pass
  66
  67 class L2Cache(Cache):
  68     assoc = 8
  69     tag_latency = 20
  70     data_latency = 20
  71     response_latency = 20
  72     mshrs = 20
  73     tgts_per_mshr = 12
  74     write_buffers = 8
  75
  76 class IOCache(Cache):
  77     assoc = 8
  78     tag_latency = 50
  79     data_latency = 50
  80     response_latency = 50
  81     mshrs = 20
  82     size = '1kB'
  83     tgts_per_mshr = 12
  84
  85 class PageTableWalkerCache(Cache):
  86     assoc = 2
  87     tag_latency = 2
  88     data_latency = 2
  89     response_latency = 2
  90     mshrs = 10
  91     size = '1kB'
  92     tgts_per_mshr = 12
  93
  94     # the x86 table walker actually writes to the table-walker cache
  95     if buildEnv['TARGET_ISA'] == 'x86':
  96         is_read_only = False
  97     else:
  98         is_read_only = True
  99         # Writeback clean lines as well
 100         writeback_clean = True