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# Copyright (c) 2012-2014, 2017-2018 ARM Limited
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# Copyright (c) 2007 The Regents of The University of Michigan
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from __future__ import print_function
from m5.defines import buildEnv
from m5.params import *
from m5.proxy import *
from m5.SimObject import SimObject
from m5.objects.BaseCPU import BaseCPU
from m5.objects.DummyChecker import DummyChecker
from m5.objects.BranchPredictor import *
from m5.objects.TimingExpr import TimingExpr
from m5.objects.FuncUnit import OpClass
class MinorOpClass(SimObject):
"""Boxing of OpClass to get around build problems and provide a hook for
future additions to OpClass checks"""
type = 'MinorOpClass'
cxx_header = "cpu/minor/func_unit.hh"
opClass = Param.OpClass("op class to match")
class MinorOpClassSet(SimObject):
"""A set of matchable op classes"""
type = 'MinorOpClassSet'
cxx_header = "cpu/minor/func_unit.hh"
opClasses = VectorParam.MinorOpClass([], "op classes to be matched."
" An empty list means any class")
class MinorFUTiming(SimObject):
type = 'MinorFUTiming'
cxx_header = "cpu/minor/func_unit.hh"
mask = Param.UInt64(0, "mask for testing ExtMachInst")
match = Param.UInt64(0, "match value for testing ExtMachInst:"
" (ext_mach_inst & mask) == match")
suppress = Param.Bool(False, "if true, this inst. is not executed by"
" this FU")
extraCommitLat = Param.Cycles(0, "extra cycles to stall commit for"
" this inst.")
extraCommitLatExpr = Param.TimingExpr(NULL, "extra cycles as a"
" run-time evaluated expression")
extraAssumedLat = Param.Cycles(0, "extra cycles to add to scoreboard"
" retire time for this insts dest registers once it leaves the"
" functional unit. For mem refs, if this is 0, the result's time"
" is marked as unpredictable and no forwarding can take place.")
srcRegsRelativeLats = VectorParam.Cycles("the maximum number of cycles"
" after inst. issue that each src reg can be available for this"
" inst. to issue")
opClasses = Param.MinorOpClassSet(MinorOpClassSet(),
"op classes to be considered for this decode. An empty set means any"
" class")
description = Param.String('', "description string of the decoding/inst."
" class")
def minorMakeOpClassSet(op_classes):
"""Make a MinorOpClassSet from a list of OpClass enum value strings"""
def boxOpClass(op_class):
return MinorOpClass(opClass=op_class)
return MinorOpClassSet(opClasses=[ boxOpClass(o) for o in op_classes ])
class MinorFU(SimObject):
type = 'MinorFU'
cxx_header = "cpu/minor/func_unit.hh"
opClasses = Param.MinorOpClassSet(MinorOpClassSet(), "type of operations"
" allowed on this functional unit")
opLat = Param.Cycles(1, "latency in cycles")
issueLat = Param.Cycles(1, "cycles until another instruction can be"
" issued")
timings = VectorParam.MinorFUTiming([], "extra decoding rules")
cantForwardFromFUIndices = VectorParam.Unsigned([],
"list of FU indices from which this FU can't receive and early"
" (forwarded) result")
class MinorFUPool(SimObject):
type = 'MinorFUPool'
cxx_header = "cpu/minor/func_unit.hh"
funcUnits = VectorParam.MinorFU("functional units")
class MinorDefaultIntFU(MinorFU):
opClasses = minorMakeOpClassSet(['IntAlu'])
timings = [MinorFUTiming(description="Int",
srcRegsRelativeLats=[2])]
opLat = 3
class MinorDefaultIntMulFU(MinorFU):
opClasses = minorMakeOpClassSet(['IntMult'])
timings = [MinorFUTiming(description='Mul',
srcRegsRelativeLats=[0])]
opLat = 3
class MinorDefaultIntDivFU(MinorFU):
opClasses = minorMakeOpClassSet(['IntDiv'])
issueLat = 9
opLat = 9
class MinorDefaultFloatSimdFU(MinorFU):
opClasses = minorMakeOpClassSet([
'FloatAdd', 'FloatCmp', 'FloatCvt', 'FloatMisc', 'FloatMult',
'FloatMultAcc', 'FloatDiv', 'FloatSqrt',
'SimdAdd', 'SimdAddAcc', 'SimdAlu', 'SimdCmp', 'SimdCvt',
'SimdMisc', 'SimdMult', 'SimdMultAcc', 'SimdShift', 'SimdShiftAcc',
'SimdDiv', 'SimdSqrt', 'SimdFloatAdd', 'SimdFloatAlu', 'SimdFloatCmp',
'SimdFloatCvt', 'SimdFloatDiv', 'SimdFloatMisc', 'SimdFloatMult',
'SimdFloatMultAcc', 'SimdFloatSqrt', 'SimdReduceAdd', 'SimdReduceAlu',
'SimdReduceCmp', 'SimdFloatReduceAdd', 'SimdFloatReduceCmp',
'SimdAes', 'SimdAesMix',
'SimdSha1Hash', 'SimdSha1Hash2', 'SimdSha256Hash',
'SimdSha256Hash2', 'SimdShaSigma2', 'SimdShaSigma3'])
timings = [MinorFUTiming(description='FloatSimd',
srcRegsRelativeLats=[2])]
opLat = 6
class MinorDefaultPredFU(MinorFU):
opClasses = minorMakeOpClassSet(['SimdPredAlu'])
timings = [MinorFUTiming(description="Pred",
srcRegsRelativeLats=[2])]
opLat = 3
class MinorDefaultMemFU(MinorFU):
opClasses = minorMakeOpClassSet(['MemRead', 'MemWrite', 'FloatMemRead',
'FloatMemWrite'])
timings = [MinorFUTiming(description='Mem',
srcRegsRelativeLats=[1], extraAssumedLat=2)]
opLat = 1
class MinorDefaultMiscFU(MinorFU):
opClasses = minorMakeOpClassSet(['IprAccess', 'InstPrefetch'])
opLat = 1
class MinorDefaultFUPool(MinorFUPool):
funcUnits = [MinorDefaultIntFU(), MinorDefaultIntFU(),
MinorDefaultIntMulFU(), MinorDefaultIntDivFU(),
MinorDefaultFloatSimdFU(), MinorDefaultPredFU(),
MinorDefaultMemFU(), MinorDefaultMiscFU()]
class ThreadPolicy(Enum): vals = ['SingleThreaded', 'RoundRobin', 'Random']
class MinorCPU(BaseCPU):
type = 'MinorCPU'
cxx_header = "cpu/minor/cpu.hh"
@classmethod
def memory_mode(cls):
return 'timing'
@classmethod
def require_caches(cls):
return True
@classmethod
def support_take_over(cls):
return True
threadPolicy = Param.ThreadPolicy('RoundRobin',
"Thread scheduling policy")
fetch1FetchLimit = Param.Unsigned(1,
"Number of line fetches allowable in flight at once")
fetch1LineSnapWidth = Param.Unsigned(0,
"Fetch1 'line' fetch snap size in bytes"
" (0 means use system cache line size)")
fetch1LineWidth = Param.Unsigned(0,
"Fetch1 maximum fetch size in bytes (0 means use system cache"
" line size)")
fetch1ToFetch2ForwardDelay = Param.Cycles(1,
"Forward cycle delay from Fetch1 to Fetch2 (1 means next cycle)")
fetch1ToFetch2BackwardDelay = Param.Cycles(1,
"Backward cycle delay from Fetch2 to Fetch1 for branch prediction"
" signalling (0 means in the same cycle, 1 mean the next cycle)")
fetch2InputBufferSize = Param.Unsigned(2,
"Size of input buffer to Fetch2 in cycles-worth of insts.")
fetch2ToDecodeForwardDelay = Param.Cycles(1,
"Forward cycle delay from Fetch2 to Decode (1 means next cycle)")
fetch2CycleInput = Param.Bool(True,
"Allow Fetch2 to cross input lines to generate full output each"
" cycle")
decodeInputBufferSize = Param.Unsigned(3,
"Size of input buffer to Decode in cycles-worth of insts.")
decodeToExecuteForwardDelay = Param.Cycles(1,
"Forward cycle delay from Decode to Execute (1 means next cycle)")
decodeInputWidth = Param.Unsigned(2,
"Width (in instructions) of input to Decode (and implicitly"
" Decode's own width)")
decodeCycleInput = Param.Bool(True,
"Allow Decode to pack instructions from more than one input cycle"
" to fill its output each cycle")
executeInputWidth = Param.Unsigned(2,
"Width (in instructions) of input to Execute")
executeCycleInput = Param.Bool(True,
"Allow Execute to use instructions from more than one input cycle"
" each cycle")
executeIssueLimit = Param.Unsigned(2,
"Number of issuable instructions in Execute each cycle")
executeMemoryIssueLimit = Param.Unsigned(1,
"Number of issuable memory instructions in Execute each cycle")
executeCommitLimit = Param.Unsigned(2,
"Number of committable instructions in Execute each cycle")
executeMemoryCommitLimit = Param.Unsigned(1,
"Number of committable memory references in Execute each cycle")
executeInputBufferSize = Param.Unsigned(7,
"Size of input buffer to Execute in cycles-worth of insts.")
executeMemoryWidth = Param.Unsigned(0,
"Width (and snap) in bytes of the data memory interface. (0 mean use"
" the system cacheLineSize)")
executeMaxAccessesInMemory = Param.Unsigned(2,
"Maximum number of concurrent accesses allowed to the memory system"
" from the dcache port")
executeLSQMaxStoreBufferStoresPerCycle = Param.Unsigned(2,
"Maximum number of stores that the store buffer can issue per cycle")
executeLSQRequestsQueueSize = Param.Unsigned(1,
"Size of LSQ requests queue (address translation queue)")
executeLSQTransfersQueueSize = Param.Unsigned(2,
"Size of LSQ transfers queue (memory transaction queue)")
executeLSQStoreBufferSize = Param.Unsigned(5,
"Size of LSQ store buffer")
executeBranchDelay = Param.Cycles(1,
"Delay from Execute deciding to branch and Fetch1 reacting"
" (1 means next cycle)")
executeFuncUnits = Param.MinorFUPool(MinorDefaultFUPool(),
"FUlines for this processor")
executeSetTraceTimeOnCommit = Param.Bool(True,
"Set inst. trace times to be commit times")
executeSetTraceTimeOnIssue = Param.Bool(False,
"Set inst. trace times to be issue times")
executeAllowEarlyMemoryIssue = Param.Bool(True,
"Allow mem refs to be issued to the LSQ before reaching the head of"
" the in flight insts queue")
enableIdling = Param.Bool(True,
"Enable cycle skipping when the processor is idle\n");
branchPred = Param.BranchPredictor(TournamentBP(
numThreads = Parent.numThreads), "Branch Predictor")
def addCheckerCpu(self):
print("Checker not yet supported by MinorCPU")
exit(1)