68d962f8af
Give fetch unit it's own parameterizable fetch buffer to read from. Very inefficient (architecturally and in simulation) to continually fetch at the granularity of the wordsize. As expected, the number of fetch memory requests drops dramatically
84 lines
4.3 KiB
Python
84 lines
4.3 KiB
Python
# Copyright (c) 2007 MIPS Technologies, Inc.
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# All rights reserved.
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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: Korey Sewell
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from m5.params import *
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from m5.proxy import *
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from BaseCPU import BaseCPU
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class ThreadModel(Enum):
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vals = ['Single', 'SMT', 'SwitchOnCacheMiss']
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class InOrderCPU(BaseCPU):
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type = 'InOrderCPU'
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activity = Param.Unsigned(0, "Initial count")
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threadModel = Param.ThreadModel('SMT', "Multithreading model (SE-MODE only)")
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cachePorts = Param.Unsigned(2, "Cache Ports")
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stageWidth = Param.Unsigned(4, "Stage width")
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fetchMemPort = Param.String("icache_port" , "Name of Memory Port to get instructions from")
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dataMemPort = Param.String("dcache_port" , "Name of Memory Port to get data from")
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icache_port = Port("Instruction Port")
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dcache_port = Port("Data Port")
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_cached_ports = ['icache_port', 'dcache_port']
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fetchBuffSize = Param.Unsigned(4, "Fetch Buffer Size (Number of Cache Blocks Stored)")
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memBlockSize = Param.Unsigned(64, "Memory Block Size")
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predType = Param.String("tournament", "Branch predictor type ('local', 'tournament')")
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localPredictorSize = Param.Unsigned(2048, "Size of local predictor")
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localCtrBits = Param.Unsigned(2, "Bits per counter")
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localHistoryTableSize = Param.Unsigned(2048, "Size of local history table")
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localHistoryBits = Param.Unsigned(11, "Bits for the local history")
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globalPredictorSize = Param.Unsigned(8192, "Size of global predictor")
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globalCtrBits = Param.Unsigned(2, "Bits per counter")
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globalHistoryBits = Param.Unsigned(13, "Bits of history")
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choicePredictorSize = Param.Unsigned(8192, "Size of choice predictor")
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choiceCtrBits = Param.Unsigned(2, "Bits of choice counters")
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BTBEntries = Param.Unsigned(4096, "Number of BTB entries")
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BTBTagSize = Param.Unsigned(16, "Size of the BTB tags, in bits")
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RASSize = Param.Unsigned(16, "RAS size")
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instShiftAmt = Param.Unsigned(2, "Number of bits to shift instructions by")
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functionTrace = Param.Bool(False, "Enable function trace")
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functionTraceStart = Param.Tick(0, "Cycle to start function trace")
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stageTracing = Param.Bool(False, "Enable tracing of each stage in CPU")
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multLatency = Param.Unsigned(1, "Latency for Multiply Operations")
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multRepeatRate = Param.Unsigned(1, "Repeat Rate for Multiply Operations")
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div8Latency = Param.Unsigned(1, "Latency for 8-bit Divide Operations")
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div8RepeatRate = Param.Unsigned(1, "Repeat Rate for 8-bit Divide Operations")
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div16Latency = Param.Unsigned(1, "Latency for 16-bit Divide Operations")
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div16RepeatRate = Param.Unsigned(1, "Repeat Rate for 16-bit Divide Operations")
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div24Latency = Param.Unsigned(1, "Latency for 24-bit Divide Operations")
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div24RepeatRate = Param.Unsigned(1, "Repeat Rate for 24-bit Divide Operations")
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div32Latency = Param.Unsigned(1, "Latency for 32-bit Divide Operations")
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div32RepeatRate = Param.Unsigned(1, "Repeat Rate for 32-bit Divide Operations")
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