d7724d5f54
This change adds a simple feature to scale the frequency of the Trace CPU. The compute delays in the input traces provide timing. This change adds a freqency multiplier parameter to the Trace CPU set to 1.0 by default. The compute delay is manipulated to effectively achieve the frequency at which the nodes become ready and thus scale the frequency of the Trace CPU. Change-Id: Iaabbd57806941ad56094fcddbeb38fcee1172431 Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
78 lines
3.4 KiB
Python
78 lines
3.4 KiB
Python
# Copyright (c) 2013 - 2016 ARM Limited
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# All rights reserved.
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#
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# The license below extends only to copyright in the software and shall
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# not be construed as granting a license to any other intellectual
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# property including but not limited to intellectual property relating
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# to a hardware implementation of the functionality of the software
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# licensed hereunder. You may use the software subject to the license
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# terms below provided that you ensure that this notice is replicated
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# unmodified and in its entirety in all distributions of the software,
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# modified or unmodified, in source code or in binary form.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met: redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer;
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# redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution;
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# neither the name of the copyright holders nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# Authors: Radhika Jagtap
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# Andreas Hansson
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# Thomas Grass
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from m5.params import *
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from BaseCPU import BaseCPU
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class TraceCPU(BaseCPU):
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"""Trace CPU model which replays traces generated in a prior simulation
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using DerivO3CPU or its derived classes. It interfaces with L1 caches.
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"""
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type = 'TraceCPU'
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cxx_header = "cpu/trace/trace_cpu.hh"
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@classmethod
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def memory_mode(cls):
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return 'timing'
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@classmethod
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def require_caches(cls):
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return True
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def addPMU(self, pmu = None):
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pass
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@classmethod
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def support_take_over(cls):
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return True
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instTraceFile = Param.String("", "Instruction trace file")
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dataTraceFile = Param.String("", "Data dependency trace file")
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sizeStoreBuffer = Param.Unsigned(16, "Number of entries in the store "\
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"buffer")
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sizeLoadBuffer = Param.Unsigned(16, "Number of entries in the load buffer")
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sizeROB = Param.Unsigned(40, "Number of entries in the re-order buffer")
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# Frequency multiplier used to effectively scale the Trace CPU frequency
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# either up or down. Note that the Trace CPU's clock domain must also be
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# changed when frequency is scaled. A default value of 1.0 means the same
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# frequency as was used for generating the traces.
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freqMultiplier = Param.Float(1.0, "Multiplier scale the Trace CPU "\
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"frequency up or down")
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