configs/common/Caches.py

   1 # Copyright (c) 2012 ARM Limited
   2 # Copyright (c) 2020 Barkhausen Institut
   3 # All rights reserved.
   4 #
   5 # The license below extends only to copyright in the software and shall
   6 # not be construed as granting a license to any other intellectual
   7 # property including but not limited to intellectual property relating
   8 # to a hardware implementation of the functionality of the software
   9 # licensed hereunder.  You may use the software subject to the license
  10 # terms below provided that you ensure that this notice is replicated
  11 # unmodified and in its entirety in all distributions of the software,
  12 # modified or unmodified, in source code or in binary form.
  13 #
  14 # Copyright (c) 2006-2007 The Regents of The University of Michigan
  15 # All rights reserved.
  16 #
  17 # Redistribution and use in source and binary forms, with or without
  18 # modification, are permitted provided that the following conditions are
  19 # met: redistributions of source code must retain the above copyright
  20 # notice, this list of conditions and the following disclaimer;
  21 # redistributions in binary form must reproduce the above copyright
  22 # notice, this list of conditions and the following disclaimer in the
  23 # documentation and/or other materials provided with the distribution;
  24 # neither the name of the copyright holders nor the names of its
  25 # contributors may be used to endorse or promote products derived from
  26 # this software without specific prior written permission.
  27 #
  28 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  29 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  30 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  31 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  32 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  33 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  34 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  35 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  36 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  37 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  38 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  39
  40 from __future__ import print_function
  41 from __future__ import absolute_import
  42
  43 from m5.defines import buildEnv
  44 from m5.objects import *
  45
  46 # Base implementations of L1, L2, IO and TLB-walker caches. There are
  47 # used in the regressions and also as base components in the
  48 # system-configuration scripts. The values are meant to serve as a
  49 # starting point, and specific parameters can be overridden in the
  50 # specific instantiations.
  51
  52 class L1Cache(Cache):
  53     assoc = 2
  54     tag_latency = 2
  55     data_latency = 2
  56     response_latency = 2
  57     mshrs = 4
  58     tgts_per_mshr = 20
  59
  60 class L1_ICache(L1Cache):
  61     is_read_only = True
  62     # Writeback clean lines as well
  63     writeback_clean = True
  64
  65 class L1_DCache(L1Cache):
  66     pass
  67
  68 class L2Cache(Cache):
  69     assoc = 8
  70     tag_latency = 20
  71     data_latency = 20
  72     response_latency = 20
  73     mshrs = 20
  74     tgts_per_mshr = 12
  75     write_buffers = 8
  76
  77 class IOCache(Cache):
  78     assoc = 8
  79     tag_latency = 50
  80     data_latency = 50
  81     response_latency = 50
  82     mshrs = 20
  83     size = '1kB'
  84     tgts_per_mshr = 12
  85
  86 class PageTableWalkerCache(Cache):
  87     assoc = 2
  88     tag_latency = 2
  89     data_latency = 2
  90     response_latency = 2
  91     mshrs = 10
  92     size = '1kB'
  93     tgts_per_mshr = 12
  94
  95     # the x86 table walker actually writes to the table-walker cache
  96     if buildEnv['TARGET_ISA'] in ['x86', 'riscv']:
  97         is_read_only = False
  98     else:
  99         is_read_only = True
 100         # Writeback clean lines as well
 101         writeback_clean = True