CpuConfig.py revision 12028 
1# Copyright (c) 2012 ARM Limited
2# All rights reserved.
3#
4# The license below extends only to copyright in the software and shall
5# not be construed as granting a license to any other intellectual
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8# licensed hereunder.  You may use the software subject to the license
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16# notice, this list of conditions and the following disclaimer;
17# redistributions in binary form must reproduce the above copyright
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22# this software without specific prior written permission.
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24# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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35#
36# Authors: Andreas Sandberg
37
38import m5.objects
39import inspect
40import sys
41from textwrap import TextWrapper
42
43# Dictionary of mapping names of real CPU models to classes.
44_cpu_classes = {}
45
46
47def is_cpu_class(cls):
48    """Determine if a class is a CPU that can be instantiated"""
49
50    # We can't use the normal inspect.isclass because the ParamFactory
51    # and ProxyFactory classes have a tendency to confuse it.
52    try:
53        return issubclass(cls, m5.objects.BaseCPU) and \
54            not cls.abstract and \
55            not issubclass(cls, m5.objects.CheckerCPU)
56    except (TypeError, AttributeError):
57        return False
58
59def get(name):
60    """Get a CPU class from a user provided class name or alias."""
61
62    try:
63        cpu_class = _cpu_classes[name]
64        return cpu_class
65    except KeyError:
66        print "%s is not a valid CPU model." % (name,)
67        sys.exit(1)
68
69def print_cpu_list():
70    """Print a list of available CPU classes including their aliases."""
71
72    print "Available CPU classes:"
73    doc_wrapper = TextWrapper(initial_indent="\t\t", subsequent_indent="\t\t")
74    for name, cls in _cpu_classes.items():
75        print "\t%s" % name
76
77        # Try to extract the class documentation from the class help
78        # string.
79        doc = inspect.getdoc(cls)
80        if doc:
81            for line in doc_wrapper.wrap(doc):
82                print line
83
84def cpu_names():
85    """Return a list of valid CPU names."""
86    return _cpu_classes.keys()
87
88def config_etrace(cpu_cls, cpu_list, options):
89    if issubclass(cpu_cls, m5.objects.DerivO3CPU):
90        # Assign the same file name to all cpus for now. This must be
91        # revisited when creating elastic traces for multi processor systems.
92        for cpu in cpu_list:
93            # Attach the elastic trace probe listener. Set the protobuf trace
94            # file names. Set the dependency window size equal to the cpu it
95            # is attached to.
96            cpu.traceListener = m5.objects.ElasticTrace(
97                                instFetchTraceFile = options.inst_trace_file,
98                                dataDepTraceFile = options.data_trace_file,
99                                depWindowSize = 3 * cpu.numROBEntries)
100            # Make the number of entries in the ROB, LQ and SQ very
101            # large so that there are no stalls due to resource
102            # limitation as such stalls will get captured in the trace
103            # as compute delay. For replay, ROB, LQ and SQ sizes are
104            # modelled in the Trace CPU.
105            cpu.numROBEntries = 512;
106            cpu.LQEntries = 128;
107            cpu.SQEntries = 128;
108    else:
109        fatal("%s does not support data dependency tracing. Use a CPU model of"
110              " type or inherited from DerivO3CPU.", cpu_cls)
111
112# The ARM detailed CPU is special in the sense that it doesn't exist
113# in the normal object hierarchy, so we have to add it manually.
114try:
115    from O3_ARM_v7a import O3_ARM_v7a_3
116    _cpu_classes["O3_ARM_v7a_3"] = O3_ARM_v7a_3
117except:
118    pass
119
120# The calibrated ex5-model cores
121try:
122    from ex5_LITTLE import ex5_LITTLE
123    _cpu_classes["ex5_LITTLE"] = ex5_LITTLE
124except:
125     pass
126
127try:
128    from ex5_big import ex5_big
129    _cpu_classes["ex5_big"] = ex5_big
130except:
131     pass
132
133
134# Add all CPUs in the object hierarchy.
135for name, cls in inspect.getmembers(m5.objects, is_cpu_class):
136    _cpu_classes[name] = cls
137