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# Authors: Matt Horsnell
#          Andreas Sandberg

from m5.defines import buildEnv
from m5.SimObject import SimObject
from m5.params import *
from m5.params import isNullPointer
from m5.proxy import *

class ArmPMU(SimObject):
    type = 'ArmPMU'
    cxx_class = 'ArmISA::PMU'
    cxx_header = 'arch/arm/pmu.hh'

    @classmethod
    def export_methods(cls, code):
        code('''
      void addEventProbe(unsigned int id,
                        SimObject *obj, const char *name);
''')

    # To prevent cycles in the configuration hierarchy, we don't keep
    # a list of supported events as a configuration param. Instead, we
    # keep them in a local list and register them using the
    # addEventProbe interface when other SimObjects register their
    # probe listeners.
    _deferred_event_types = []
    # Override the normal SimObject::regProbeListeners method and
    # register deferred event handlers.
    def regProbeListeners(self):
        for event_id, obj, name in self._deferred_event_types:
            self.getCCObject().addEventProbe(event_id, obj.getCCObject(), name)

        self.getCCObject().regProbeListeners()

    def addEventProbe(self, event_id, obj, *args):
        """Add a probe-based event to the PMU if obj is not None."""

        if obj is None:
            return

        for name in args:
            self._deferred_event_types.append((event_id, obj, name))

    platform = Param.Platform(Parent.any, "Platform this device is part of.")
    eventCounters = Param.Int(31, "Number of supported PMU counters")
    pmuInterrupt = Param.Int(68, "PMU GIC interrupt number")