xref: /gem5/src/cpu/o3/O3CPU.py

# Copyright (c) 2005-2007 The Regents of The University of Michigan
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer;
# redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution;
# neither the name of the copyright holders nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# Authors: Kevin Lim

from m5.defines import buildEnv
from m5.params import *
from m5.proxy import *
from BaseCPU import BaseCPU
from FUPool import *

if buildEnv['USE_CHECKER']:
    from O3Checker import O3Checker

class DerivO3CPU(BaseCPU):
    type = 'DerivO3CPU'
    activity = Param.Unsigned(0, "Initial count")

    if buildEnv['USE_CHECKER']:
        if not buildEnv['FULL_SYSTEM']:
            checker = Param.BaseCPU(O3Checker(workload=Parent.workload,
                                              exitOnError=False,
                                              updateOnError=True,
                                              warnOnlyOnLoadError=False),
                                    "checker")
        else:
            checker = Param.BaseCPU(O3Checker(exitOnError=False, updateOnError=True,
                                              warnOnlyOnLoadError=False), "checker")
        checker.itb = Parent.itb
        checker.dtb = Parent.dtb

    cachePorts = Param.Unsigned(200, "Cache Ports")

    decodeToFetchDelay = Param.Unsigned(1, "Decode to fetch delay")
    renameToFetchDelay = Param.Unsigned(1 ,"Rename to fetch delay")
    iewToFetchDelay = Param.Unsigned(1, "Issue/Execute/Writeback to fetch "
                                     "delay")
    commitToFetchDelay = Param.Unsigned(1, "Commit to fetch delay")
    fetchWidth = Param.Unsigned(8, "Fetch width")

    renameToDecodeDelay = Param.Unsigned(1, "Rename to decode delay")
    iewToDecodeDelay = Param.Unsigned(1, "Issue/Execute/Writeback to decode "
               "delay")
    commitToDecodeDelay = Param.Unsigned(1, "Commit to decode delay")
    fetchToDecodeDelay = Param.Unsigned(1, "Fetch to decode delay")
    decodeWidth = Param.Unsigned(8, "Decode width")

    iewToRenameDelay = Param.Unsigned(1, "Issue/Execute/Writeback to rename "
               "delay")
    commitToRenameDelay = Param.Unsigned(1, "Commit to rename delay")
    decodeToRenameDelay = Param.Unsigned(1, "Decode to rename delay")
    renameWidth = Param.Unsigned(8, "Rename width")

    commitToIEWDelay = Param.Unsigned(1, "Commit to "
               "Issue/Execute/Writeback delay")
    renameToIEWDelay = Param.Unsigned(2, "Rename to "
               "Issue/Execute/Writeback delay")
    issueToExecuteDelay = Param.Unsigned(1, "Issue to execute delay (internal "
              "to the IEW stage)")
    dispatchWidth = Param.Unsigned(8, "Dispatch width")
    issueWidth = Param.Unsigned(8, "Issue width")
    wbWidth = Param.Unsigned(8, "Writeback width")
    wbDepth = Param.Unsigned(1, "Writeback depth")
    fuPool = Param.FUPool(DefaultFUPool(), "Functional Unit pool")

    iewToCommitDelay = Param.Unsigned(1, "Issue/Execute/Writeback to commit "
               "delay")
    renameToROBDelay = Param.Unsigned(1, "Rename to reorder buffer delay")
    commitWidth = Param.Unsigned(8, "Commit width")
    squashWidth = Param.Unsigned(8, "Squash width")
    trapLatency = Param.Tick(13, "Trap latency")
    fetchTrapLatency = Param.Tick(1, "Fetch trap latency")

    backComSize = Param.Unsigned(5, "Time buffer size for backwards communication")
    forwardComSize = Param.Unsigned(5, "Time buffer size for forward communication")

    predType = Param.String("tournament", "Branch predictor type ('local', 'tournament')")
    localPredictorSize = Param.Unsigned(2048, "Size of local predictor")
    localCtrBits = Param.Unsigned(2, "Bits per counter")
    localHistoryTableSize = Param.Unsigned(2048, "Size of local history table")
    localHistoryBits = Param.Unsigned(11, "Bits for the local history")
    globalPredictorSize = Param.Unsigned(8192, "Size of global predictor")
    globalCtrBits = Param.Unsigned(2, "Bits per counter")
    globalHistoryBits = Param.Unsigned(13, "Bits of history")
    choicePredictorSize = Param.Unsigned(8192, "Size of choice predictor")
    choiceCtrBits = Param.Unsigned(2, "Bits of choice counters")

    BTBEntries = Param.Unsigned(4096, "Number of BTB entries")
    BTBTagSize = Param.Unsigned(16, "Size of the BTB tags, in bits")

    RASSize = Param.Unsigned(16, "RAS size")

    LQEntries = Param.Unsigned(32, "Number of load queue entries")
    SQEntries = Param.Unsigned(32, "Number of store queue entries")
    LSQDepCheckShift = Param.Unsigned(4, "Number of places to shift addr before check")
    LSQCheckLoads = Param.Bool(True,
        "Should dependency violations be checked for loads & stores or just stores")
    store_set_clear_period = Param.Unsigned(250000,
            "Number of load/store insts before the dep predictor should be invalidated")
    LFSTSize = Param.Unsigned(1024, "Last fetched store table size")
    SSITSize = Param.Unsigned(1024, "Store set ID table size")

    numRobs = Param.Unsigned(1, "Number of Reorder Buffers");

    numPhysIntRegs = Param.Unsigned(256, "Number of physical integer registers")
    numPhysFloatRegs = Param.Unsigned(256, "Number of physical floating point "
                                      "registers")
    numIQEntries = Param.Unsigned(64, "Number of instruction queue entries")
    numROBEntries = Param.Unsigned(192, "Number of reorder buffer entries")

    instShiftAmt = Param.Unsigned(2, "Number of bits to shift instructions by")

    smtNumFetchingThreads = Param.Unsigned(1, "SMT Number of Fetching Threads")
    smtFetchPolicy = Param.String('SingleThread', "SMT Fetch policy")
    smtLSQPolicy    = Param.String('Partitioned', "SMT LSQ Sharing Policy")
    smtLSQThreshold = Param.Int(100, "SMT LSQ Threshold Sharing Parameter")
    smtIQPolicy    = Param.String('Partitioned', "SMT IQ Sharing Policy")
    smtIQThreshold = Param.Int(100, "SMT IQ Threshold Sharing Parameter")
    smtROBPolicy   = Param.String('Partitioned', "SMT ROB Sharing Policy")
    smtROBThreshold = Param.Int(100, "SMT ROB Threshold Sharing Parameter")
    smtCommitPolicy = Param.String('RoundRobin', "SMT Commit Policy")

    needsTSO = Param.Bool(buildEnv['TARGET_ISA'] == 'x86',
                          "Enable TSO Memory model")