CpuConfig.py revision 13012 
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36# Authors: Andreas Sandberg
37
38from __future__ import print_function
39
40from m5 import fatal
41import m5.objects
42import inspect
43import sys
44from textwrap import TextWrapper
45
46# Dictionary of mapping names of real CPU models to classes.
47_cpu_classes = {}
48
49
50def is_cpu_class(cls):
51    """Determine if a class is a CPU that can be instantiated"""
52
53    # We can't use the normal inspect.isclass because the ParamFactory
54    # and ProxyFactory classes have a tendency to confuse it.
55    try:
56        return issubclass(cls, m5.objects.BaseCPU) and \
57            not cls.abstract and \
58            not issubclass(cls, m5.objects.CheckerCPU)
59    except (TypeError, AttributeError):
60        return False
61
62def _cpu_subclass_tester(name):
63    cpu_class = getattr(m5.objects, name, None)
64
65    def tester(cls):
66        return cpu_class is not None and cls is not None and \
67            issubclass(cls, cpu_class)
68
69    return tester
70
71is_kvm_cpu = _cpu_subclass_tester("BaseKvmCPU")
72is_atomic_cpu = _cpu_subclass_tester("AtomicSimpleCPU")
73
74def get(name):
75    """Get a CPU class from a user provided class name or alias."""
76
77    try:
78        cpu_class = _cpu_classes[name]
79        return cpu_class
80    except KeyError:
81        print("%s is not a valid CPU model." % (name,))
82        sys.exit(1)
83
84def print_cpu_list():
85    """Print a list of available CPU classes including their aliases."""
86
87    print("Available CPU classes:")
88    doc_wrapper = TextWrapper(initial_indent="\t\t", subsequent_indent="\t\t")
89    for name, cls in _cpu_classes.items():
90        print("\t%s" % name)
91
92        # Try to extract the class documentation from the class help
93        # string.
94        doc = inspect.getdoc(cls)
95        if doc:
96            for line in doc_wrapper.wrap(doc):
97                print(line)
98
99def cpu_names():
100    """Return a list of valid CPU names."""
101    return _cpu_classes.keys()
102
103def config_etrace(cpu_cls, cpu_list, options):
104    if issubclass(cpu_cls, m5.objects.DerivO3CPU):
105        # Assign the same file name to all cpus for now. This must be
106        # revisited when creating elastic traces for multi processor systems.
107        for cpu in cpu_list:
108            # Attach the elastic trace probe listener. Set the protobuf trace
109            # file names. Set the dependency window size equal to the cpu it
110            # is attached to.
111            cpu.traceListener = m5.objects.ElasticTrace(
112                                instFetchTraceFile = options.inst_trace_file,
113                                dataDepTraceFile = options.data_trace_file,
114                                depWindowSize = 3 * cpu.numROBEntries)
115            # Make the number of entries in the ROB, LQ and SQ very
116            # large so that there are no stalls due to resource
117            # limitation as such stalls will get captured in the trace
118            # as compute delay. For replay, ROB, LQ and SQ sizes are
119            # modelled in the Trace CPU.
120            cpu.numROBEntries = 512;
121            cpu.LQEntries = 128;
122            cpu.SQEntries = 128;
123    else:
124        fatal("%s does not support data dependency tracing. Use a CPU model of"
125              " type or inherited from DerivO3CPU.", cpu_cls)
126
127# Add all CPUs in the object hierarchy.
128for name, cls in inspect.getmembers(m5.objects, is_cpu_class):
129    _cpu_classes[name] = cls
130
131
132from m5.defines import buildEnv
133from importlib import import_module
134for package in [ "generic", buildEnv['TARGET_ISA']]:
135    try:
136        package = import_module(".cores." + package, package=__package__)
137    except ImportError:
138        # No timing models for this ISA
139        continue
140
141    for mod_name, module in inspect.getmembers(package, inspect.ismodule):
142        for name, cls in inspect.getmembers(module, is_cpu_class):
143            _cpu_classes[name] = cls
144