O3CPU.py revision 8733:64a7bf8fa56c 
1# Copyright (c) 2005-2007 The Regents of The University of Michigan
2# All rights reserved.
3#
4# Redistribution and use in source and binary forms, with or without
5# modification, are permitted provided that the following conditions are
6# met: redistributions of source code must retain the above copyright
7# notice, this list of conditions and the following disclaimer;
8# redistributions in binary form must reproduce the above copyright
9# notice, this list of conditions and the following disclaimer in the
10# documentation and/or other materials provided with the distribution;
11# neither the name of the copyright holders nor the names of its
12# contributors may be used to endorse or promote products derived from
13# this software without specific prior written permission.
14#
15# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
18# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
19# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
21# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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25# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26#
27# Authors: Kevin Lim
28
29from m5.defines import buildEnv
30from m5.params import *
31from m5.proxy import *
32from BaseCPU import BaseCPU
33from FUPool import *
34
35if buildEnv['USE_CHECKER']:
36    from O3Checker import O3Checker
37
38class DerivO3CPU(BaseCPU):
39    type = 'DerivO3CPU'
40    activity = Param.Unsigned(0, "Initial count")
41
42    if buildEnv['USE_CHECKER']:
43        if not buildEnv['FULL_SYSTEM']:
44            # FIXME: Shouldn't need to derefernce Parent.workload
45            #        Somewhere in the param parsing code
46            #        src/python/m5/params.py is and error that
47            #        has trouble converting the workload parameter properly.
48            checker = Param.BaseCPU(O3Checker(workload=Parent.workload[0],
49                                              exitOnError=False,
50                                              updateOnError=True,
51                                              warnOnlyOnLoadError=True),
52                                              "checker")
53        else:
54            checker = Param.BaseCPU(O3Checker(exitOnError=False,
55                                              updateOnError=True,
56                                              warnOnlyOnLoadError=True),
57                                              "checker")
58        checker.itb = Parent.itb
59        checker.dtb = Parent.dtb
60
61    cachePorts = Param.Unsigned(200, "Cache Ports")
62
63    decodeToFetchDelay = Param.Unsigned(1, "Decode to fetch delay")
64    renameToFetchDelay = Param.Unsigned(1 ,"Rename to fetch delay")
65    iewToFetchDelay = Param.Unsigned(1, "Issue/Execute/Writeback to fetch "
66                                     "delay")
67    commitToFetchDelay = Param.Unsigned(1, "Commit to fetch delay")
68    fetchWidth = Param.Unsigned(8, "Fetch width")
69
70    renameToDecodeDelay = Param.Unsigned(1, "Rename to decode delay")
71    iewToDecodeDelay = Param.Unsigned(1, "Issue/Execute/Writeback to decode "
72               "delay")
73    commitToDecodeDelay = Param.Unsigned(1, "Commit to decode delay")
74    fetchToDecodeDelay = Param.Unsigned(1, "Fetch to decode delay")
75    decodeWidth = Param.Unsigned(8, "Decode width")
76
77    iewToRenameDelay = Param.Unsigned(1, "Issue/Execute/Writeback to rename "
78               "delay")
79    commitToRenameDelay = Param.Unsigned(1, "Commit to rename delay")
80    decodeToRenameDelay = Param.Unsigned(1, "Decode to rename delay")
81    renameWidth = Param.Unsigned(8, "Rename width")
82
83    commitToIEWDelay = Param.Unsigned(1, "Commit to "
84               "Issue/Execute/Writeback delay")
85    renameToIEWDelay = Param.Unsigned(2, "Rename to "
86               "Issue/Execute/Writeback delay")
87    issueToExecuteDelay = Param.Unsigned(1, "Issue to execute delay (internal "
88              "to the IEW stage)")
89    dispatchWidth = Param.Unsigned(8, "Dispatch width")
90    issueWidth = Param.Unsigned(8, "Issue width")
91    wbWidth = Param.Unsigned(8, "Writeback width")
92    wbDepth = Param.Unsigned(1, "Writeback depth")
93    fuPool = Param.FUPool(DefaultFUPool(), "Functional Unit pool")
94
95    iewToCommitDelay = Param.Unsigned(1, "Issue/Execute/Writeback to commit "
96               "delay")
97    renameToROBDelay = Param.Unsigned(1, "Rename to reorder buffer delay")
98    commitWidth = Param.Unsigned(8, "Commit width")
99    squashWidth = Param.Unsigned(8, "Squash width")
100    trapLatency = Param.Tick(13, "Trap latency")
101    fetchTrapLatency = Param.Tick(1, "Fetch trap latency")
102
103    backComSize = Param.Unsigned(5, "Time buffer size for backwards communication")
104    forwardComSize = Param.Unsigned(5, "Time buffer size for forward communication")
105
106    predType = Param.String("tournament", "Branch predictor type ('local', 'tournament')")
107    localPredictorSize = Param.Unsigned(2048, "Size of local predictor")
108    localCtrBits = Param.Unsigned(2, "Bits per counter")
109    localHistoryTableSize = Param.Unsigned(2048, "Size of local history table")
110    localHistoryBits = Param.Unsigned(11, "Bits for the local history")
111    globalPredictorSize = Param.Unsigned(8192, "Size of global predictor")
112    globalCtrBits = Param.Unsigned(2, "Bits per counter")
113    globalHistoryBits = Param.Unsigned(13, "Bits of history")
114    choicePredictorSize = Param.Unsigned(8192, "Size of choice predictor")
115    choiceCtrBits = Param.Unsigned(2, "Bits of choice counters")
116
117    BTBEntries = Param.Unsigned(4096, "Number of BTB entries")
118    BTBTagSize = Param.Unsigned(16, "Size of the BTB tags, in bits")
119
120    RASSize = Param.Unsigned(16, "RAS size")
121
122    LQEntries = Param.Unsigned(32, "Number of load queue entries")
123    SQEntries = Param.Unsigned(32, "Number of store queue entries")
124    LSQDepCheckShift = Param.Unsigned(4, "Number of places to shift addr before check")
125    LSQCheckLoads = Param.Bool(True,
126        "Should dependency violations be checked for loads & stores or just stores")
127    store_set_clear_period = Param.Unsigned(250000,
128            "Number of load/store insts before the dep predictor should be invalidated")
129    LFSTSize = Param.Unsigned(1024, "Last fetched store table size")
130    SSITSize = Param.Unsigned(1024, "Store set ID table size")
131
132    numRobs = Param.Unsigned(1, "Number of Reorder Buffers");
133
134    numPhysIntRegs = Param.Unsigned(256, "Number of physical integer registers")
135    numPhysFloatRegs = Param.Unsigned(256, "Number of physical floating point "
136                                      "registers")
137    numIQEntries = Param.Unsigned(64, "Number of instruction queue entries")
138    numROBEntries = Param.Unsigned(192, "Number of reorder buffer entries")
139
140    instShiftAmt = Param.Unsigned(2, "Number of bits to shift instructions by")
141
142    smtNumFetchingThreads = Param.Unsigned(1, "SMT Number of Fetching Threads")
143    smtFetchPolicy = Param.String('SingleThread', "SMT Fetch policy")
144    smtLSQPolicy    = Param.String('Partitioned', "SMT LSQ Sharing Policy")
145    smtLSQThreshold = Param.Int(100, "SMT LSQ Threshold Sharing Parameter")
146    smtIQPolicy    = Param.String('Partitioned', "SMT IQ Sharing Policy")
147    smtIQThreshold = Param.Int(100, "SMT IQ Threshold Sharing Parameter")
148    smtROBPolicy   = Param.String('Partitioned', "SMT ROB Sharing Policy")
149    smtROBThreshold = Param.Int(100, "SMT ROB Threshold Sharing Parameter")
150    smtCommitPolicy = Param.String('RoundRobin', "SMT Commit Policy")
151
152    needsTSO = Param.Bool(buildEnv['TARGET_ISA'] == 'x86',
153                          "Enable TSO Memory model")
154