818961969a
This commit does not make any functional changes but just rearranges the existing code with regard to the power states. Previously, all code regarding power states was in the ClockedObjects. However, it seems more logical and cleaner to move this code into a separate class, called PowerState. The PowerState is a now SimObject. Every ClockedObject has a PowerState but this patch also allows for objects with PowerState which are not ClockedObjects. Change-Id: Id2db86dc14f140dc9d0912a8a7de237b9df9120d Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-by: Sascha Bischoff <sascha.bischoff@arm.com> Signed-off-by: Nikos Nikoleris <nikos.nikoleris@arm.com> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/28049 Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu> Maintainer: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>
68 lines
3.5 KiB
Python
68 lines
3.5 KiB
Python
# Copyright (c) 2012, 2015-2017 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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from m5.SimObject import SimObject
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from m5.params import *
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from m5.proxy import *
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# Enumerate set of allowed power states that can be used by a clocked object.
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# The list is kept generic to express a base minimal set.
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# State definition :-
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# Undefined: Invalid state, no power state derived information is available.
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# On: The logic block is actively running and consuming dynamic and leakage
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# energy depending on the amount of processing required.
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# Clk_gated: The clock circuity within the block is gated to save dynamic
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# energy, the power supply to the block is still on and leakage
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# energy is being consumed by the block.
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# Sram_retention: The SRAMs within the logic blocks are pulled into retention
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# state to reduce leakage energy further.
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# Off: The logic block is power gated and is not consuming any energy.
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class PwrState(Enum): vals = [
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'UNDEFINED', 'ON', 'CLK_GATED', 'SRAM_RETENTION', 'OFF'
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]
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class PowerState(SimObject):
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type = 'PowerState'
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cxx_header = "sim/power_state.hh"
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# Provide initial power state, should ideally get redefined in startup
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# routine
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default_state = Param.PwrState("UNDEFINED", "Default Power State")
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clk_gate_min = Param.Latency('1ns',"Min value of the distribution")
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clk_gate_max = Param.Latency('1s',"Max value of the distribution")
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clk_gate_bins = Param.Unsigned('20', "# bins in clk gated distribution")
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