# Copyright (c) 2012 The Regents of The University of Michigan
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from m5.objects import *

# Simple ALU Instructions have a latency of 1
class O3_ARM_v7a_Simple_Int(FUDesc):
    opList = [ OpDesc(opClass='IntAlu', opLat=1) ]
    count = 2

# Complex ALU instructions have a variable latencies
class O3_ARM_v7a_Complex_Int(FUDesc):
    opList = [ OpDesc(opClass='IntMult', opLat=3, pipelined=True),
               OpDesc(opClass='IntDiv', opLat=12, pipelined=False),
               OpDesc(opClass='IprAccess', opLat=3, pipelined=True) ]
    count = 1


# Floating point and SIMD instructions
class O3_ARM_v7a_FP(FUDesc):
    opList = [ OpDesc(opClass='SimdAdd', opLat=4),
               OpDesc(opClass='SimdAddAcc', opLat=4),
               OpDesc(opClass='SimdAlu', opLat=4),
               OpDesc(opClass='SimdCmp', opLat=4),
               OpDesc(opClass='SimdCvt', opLat=3),
               OpDesc(opClass='SimdMisc', opLat=3),
               OpDesc(opClass='SimdMult',opLat=5),
               OpDesc(opClass='SimdMultAcc',opLat=5),
               OpDesc(opClass='SimdShift',opLat=3),
               OpDesc(opClass='SimdShiftAcc', opLat=3),
               OpDesc(opClass='SimdSqrt', opLat=9),
               OpDesc(opClass='SimdFloatAdd',opLat=5),
               OpDesc(opClass='SimdFloatAlu',opLat=5),
               OpDesc(opClass='SimdFloatCmp', opLat=3),
               OpDesc(opClass='SimdFloatCvt', opLat=3),
               OpDesc(opClass='SimdFloatDiv', opLat=3),
               OpDesc(opClass='SimdFloatMisc', opLat=3),
               OpDesc(opClass='SimdFloatMult', opLat=3),
               OpDesc(opClass='SimdFloatMultAcc',opLat=5),
               OpDesc(opClass='SimdFloatSqrt', opLat=9),
               OpDesc(opClass='FloatAdd', opLat=5),
               OpDesc(opClass='FloatCmp', opLat=5),
               OpDesc(opClass='FloatCvt', opLat=5),
               OpDesc(opClass='FloatDiv', opLat=9, pipelined=False),
               OpDesc(opClass='FloatSqrt', opLat=33, pipelined=False),
               OpDesc(opClass='FloatMult', opLat=4),
               OpDesc(opClass='FloatMultAcc', opLat=5),
               OpDesc(opClass='FloatMisc', opLat=3) ]
    count = 2


# Load/Store Units
class O3_ARM_v7a_Load(FUDesc):
    opList = [ OpDesc(opClass='MemRead',opLat=2),
               OpDesc(opClass='FloatMemRead',opLat=2) ]
    count = 1

class O3_ARM_v7a_Store(FUDesc):
    opList = [ OpDesc(opClass='MemWrite',opLat=2),
               OpDesc(opClass='FloatMemWrite',opLat=2) ]
    count = 1

# Functional Units for this CPU
class O3_ARM_v7a_FUP(FUPool):
    FUList = [O3_ARM_v7a_Simple_Int(), O3_ARM_v7a_Complex_Int(),
              O3_ARM_v7a_Load(), O3_ARM_v7a_Store(), O3_ARM_v7a_FP()]

# Bi-Mode Branch Predictor
class O3_ARM_v7a_BP(BiModeBP):
    globalPredictorSize = 8192
    globalCtrBits = 2
    choicePredictorSize = 8192
    choiceCtrBits = 2
    BTBEntries = 2048
    BTBTagSize = 18
    RASSize = 16
    instShiftAmt = 2

class O3_ARM_v7a_3(DerivO3CPU):
    LQEntries = 16
    SQEntries = 16
    LSQDepCheckShift = 0
    LFSTSize = 1024
    SSITSize = 1024
    decodeToFetchDelay = 1
    renameToFetchDelay = 1
    iewToFetchDelay = 1
    commitToFetchDelay = 1
    renameToDecodeDelay = 1
    iewToDecodeDelay = 1
    commitToDecodeDelay = 1
    iewToRenameDelay = 1
    commitToRenameDelay = 1
    commitToIEWDelay = 1
    fetchWidth = 3
    fetchBufferSize = 16
    fetchToDecodeDelay = 3
    decodeWidth = 3
    decodeToRenameDelay = 2
    renameWidth = 3
    renameToIEWDelay = 1
    issueToExecuteDelay = 1
    dispatchWidth = 6
    issueWidth = 8
    wbWidth = 8
    fuPool = O3_ARM_v7a_FUP()
    iewToCommitDelay = 1
    renameToROBDelay = 1
    commitWidth = 8
    squashWidth = 8
    trapLatency = 13
    backComSize = 5
    forwardComSize = 5
    numPhysIntRegs = 128
    numPhysFloatRegs = 192
    numPhysVecRegs = 48
    numIQEntries = 32
    numROBEntries = 40

    switched_out = False
    branchPred = O3_ARM_v7a_BP()

# Instruction Cache
class O3_ARM_v7a_ICache(Cache):
    tag_latency = 1
    data_latency = 1
    response_latency = 1
    mshrs = 2
    tgts_per_mshr = 8
    size = '32kB'
    assoc = 2
    is_read_only = True
    # Writeback clean lines as well
    writeback_clean = True

# Data Cache
class O3_ARM_v7a_DCache(Cache):
    tag_latency = 2
    data_latency = 2
    response_latency = 2
    mshrs = 6
    tgts_per_mshr = 8
    size = '32kB'
    assoc = 2
    write_buffers = 16
    # Consider the L2 a victim cache also for clean lines
    writeback_clean = True

# TLB Cache
# Use a cache as a L2 TLB
class O3_ARM_v7aWalkCache(Cache):
    tag_latency = 4
    data_latency = 4
    response_latency = 4
    mshrs = 6
    tgts_per_mshr = 8
    size = '1kB'
    assoc = 8
    write_buffers = 16
    is_read_only = True
    # Writeback clean lines as well
    writeback_clean = True

# L2 Cache
class O3_ARM_v7aL2(Cache):
    tag_latency = 12
    data_latency = 12
    response_latency = 12
    mshrs = 16
    tgts_per_mshr = 8
    size = '1MB'
    assoc = 16
    write_buffers = 8
    prefetch_on_access = True
    clusivity = 'mostly_excl'
    # Simple stride prefetcher
    prefetcher = StridePrefetcher(degree=8, latency = 1)
    tags = BaseSetAssoc()
    replacement_policy = RandomRP()