O3CPU.py revision 13563 
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39# Authors: Kevin Lim
40
41from __future__ import print_function
42
43from m5.defines import buildEnv
44from m5.params import *
45from m5.proxy import *
46from BaseCPU import BaseCPU
47from FUPool import *
48from O3Checker import O3Checker
49from BranchPredictor import *
50
51class FetchPolicy(ScopedEnum):
52    vals = [ 'SingleThread', 'RoundRobin', 'Branch', 'IQCount', 'LSQCount' ]
53
54class SMTQueuePolicy(ScopedEnum):
55    vals = [ 'Dynamic', 'Partitioned', 'Threshold' ]
56
57class CommitPolicy(ScopedEnum):
58    vals = [ 'Aggressive', 'RoundRobin', 'OldestReady' ]
59
60class DerivO3CPU(BaseCPU):
61    type = 'DerivO3CPU'
62    cxx_header = 'cpu/o3/deriv.hh'
63
64    @classmethod
65    def memory_mode(cls):
66        return 'timing'
67
68    @classmethod
69    def require_caches(cls):
70        return True
71
72    @classmethod
73    def support_take_over(cls):
74        return True
75
76    activity = Param.Unsigned(0, "Initial count")
77
78    cacheStorePorts = Param.Unsigned(200, "Cache Ports. "
79          "Constrains stores only. Loads are constrained by load FUs.")
80
81    decodeToFetchDelay = Param.Cycles(1, "Decode to fetch delay")
82    renameToFetchDelay = Param.Cycles(1 ,"Rename to fetch delay")
83    iewToFetchDelay = Param.Cycles(1, "Issue/Execute/Writeback to fetch "
84                                   "delay")
85    commitToFetchDelay = Param.Cycles(1, "Commit to fetch delay")
86    fetchWidth = Param.Unsigned(8, "Fetch width")
87    fetchBufferSize = Param.Unsigned(64, "Fetch buffer size in bytes")
88    fetchQueueSize = Param.Unsigned(32, "Fetch queue size in micro-ops "
89                                    "per-thread")
90
91    renameToDecodeDelay = Param.Cycles(1, "Rename to decode delay")
92    iewToDecodeDelay = Param.Cycles(1, "Issue/Execute/Writeback to decode "
93                                    "delay")
94    commitToDecodeDelay = Param.Cycles(1, "Commit to decode delay")
95    fetchToDecodeDelay = Param.Cycles(1, "Fetch to decode delay")
96    decodeWidth = Param.Unsigned(8, "Decode width")
97
98    iewToRenameDelay = Param.Cycles(1, "Issue/Execute/Writeback to rename "
99                                    "delay")
100    commitToRenameDelay = Param.Cycles(1, "Commit to rename delay")
101    decodeToRenameDelay = Param.Cycles(1, "Decode to rename delay")
102    renameWidth = Param.Unsigned(8, "Rename width")
103
104    commitToIEWDelay = Param.Cycles(1, "Commit to "
105               "Issue/Execute/Writeback delay")
106    renameToIEWDelay = Param.Cycles(2, "Rename to "
107               "Issue/Execute/Writeback delay")
108    issueToExecuteDelay = Param.Cycles(1, "Issue to execute delay (internal "
109              "to the IEW stage)")
110    dispatchWidth = Param.Unsigned(8, "Dispatch width")
111    issueWidth = Param.Unsigned(8, "Issue width")
112    wbWidth = Param.Unsigned(8, "Writeback width")
113    fuPool = Param.FUPool(DefaultFUPool(), "Functional Unit pool")
114
115    iewToCommitDelay = Param.Cycles(1, "Issue/Execute/Writeback to commit "
116               "delay")
117    renameToROBDelay = Param.Cycles(1, "Rename to reorder buffer delay")
118    commitWidth = Param.Unsigned(8, "Commit width")
119    squashWidth = Param.Unsigned(8, "Squash width")
120    trapLatency = Param.Cycles(13, "Trap latency")
121    fetchTrapLatency = Param.Cycles(1, "Fetch trap latency")
122
123    backComSize = Param.Unsigned(5, "Time buffer size for backwards communication")
124    forwardComSize = Param.Unsigned(5, "Time buffer size for forward communication")
125
126    LQEntries = Param.Unsigned(32, "Number of load queue entries")
127    SQEntries = Param.Unsigned(32, "Number of store queue entries")
128    LSQDepCheckShift = Param.Unsigned(4, "Number of places to shift addr before check")
129    LSQCheckLoads = Param.Bool(True,
130        "Should dependency violations be checked for loads & stores or just stores")
131    store_set_clear_period = Param.Unsigned(250000,
132            "Number of load/store insts before the dep predictor should be invalidated")
133    LFSTSize = Param.Unsigned(1024, "Last fetched store table size")
134    SSITSize = Param.Unsigned(1024, "Store set ID table size")
135
136    numRobs = Param.Unsigned(1, "Number of Reorder Buffers");
137
138    numPhysIntRegs = Param.Unsigned(256, "Number of physical integer registers")
139    numPhysFloatRegs = Param.Unsigned(256, "Number of physical floating point "
140                                      "registers")
141    # most ISAs don't use condition-code regs, so default is 0
142    _defaultNumPhysCCRegs = 0
143    if buildEnv['TARGET_ISA'] in ('arm','x86'):
144        # For x86, each CC reg is used to hold only a subset of the
145        # flags, so we need 4-5 times the number of CC regs as
146        # physical integer regs to be sure we don't run out.  In
147        # typical real machines, CC regs are not explicitly renamed
148        # (it's a side effect of int reg renaming), so they should
149        # never be the bottleneck here.
150        _defaultNumPhysCCRegs = Self.numPhysIntRegs * 5
151    numPhysVecRegs = Param.Unsigned(256, "Number of physical vector "
152                                      "registers")
153    numPhysCCRegs = Param.Unsigned(_defaultNumPhysCCRegs,
154                                   "Number of physical cc registers")
155    numIQEntries = Param.Unsigned(64, "Number of instruction queue entries")
156    numROBEntries = Param.Unsigned(192, "Number of reorder buffer entries")
157
158    smtNumFetchingThreads = Param.Unsigned(1, "SMT Number of Fetching Threads")
159    smtFetchPolicy = Param.FetchPolicy('SingleThread', "SMT Fetch policy")
160    smtLSQPolicy    = Param.SMTQueuePolicy('Partitioned',
161                                           "SMT LSQ Sharing Policy")
162    smtLSQThreshold = Param.Int(100, "SMT LSQ Threshold Sharing Parameter")
163    smtIQPolicy    = Param.SMTQueuePolicy('Partitioned',
164                                          "SMT IQ Sharing Policy")
165    smtIQThreshold = Param.Int(100, "SMT IQ Threshold Sharing Parameter")
166    smtROBPolicy   = Param.SMTQueuePolicy('Partitioned',
167                                          "SMT ROB Sharing Policy")
168    smtROBThreshold = Param.Int(100, "SMT ROB Threshold Sharing Parameter")
169    smtCommitPolicy = Param.CommitPolicy('RoundRobin', "SMT Commit Policy")
170
171    branchPred = Param.BranchPredictor(TournamentBP(numThreads =
172                                                       Parent.numThreads),
173                                       "Branch Predictor")
174    needsTSO = Param.Bool(buildEnv['TARGET_ISA'] == 'x86',
175                          "Enable TSO Memory model")
176
177    def addCheckerCpu(self):
178        if buildEnv['TARGET_ISA'] in ['arm']:
179            from ArmTLB import ArmTLB
180
181            self.checker = O3Checker(workload=self.workload,
182                                     exitOnError=False,
183                                     updateOnError=True,
184                                     warnOnlyOnLoadError=True)
185            self.checker.itb = ArmTLB(size = self.itb.size)
186            self.checker.dtb = ArmTLB(size = self.dtb.size)
187            self.checker.cpu_id = self.cpu_id
188
189        else:
190            print("ERROR: Checker only supported under ARM ISA!")
191            exit(1)
192