# -*- mode:python -*-
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# Authors: Matt Horsnell
#          Andreas Sandberg

from m5.defines import buildEnv
from m5.SimObject import *
from m5.params import *
from m5.params import isNullPointer
from m5.proxy import *
from m5.objects.Gic import ArmInterruptPin

class ProbeEvent(object):
    def __init__(self, pmu, _eventId, obj, *listOfNames):
        self.obj = obj
        self.names = listOfNames
        self.eventId = _eventId
        self.pmu = pmu

    def register(self):
        if self.obj:
            for name in self.names:
                self.pmu.getCCObject().addEventProbe(self.eventId,
                    self.obj.getCCObject(), name)

class SoftwareIncrement(object):
    def __init__(self,pmu, _eventId):
        self.eventId = _eventId
        self.pmu = pmu

    def register(self):
        self.pmu.getCCObject().addSoftwareIncrementEvent(self.eventId)

ARCH_EVENT_CORE_CYCLES = 0x11

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

    cxx_exports = [
        PyBindMethod("addEventProbe"),
        PyBindMethod("addSoftwareIncrementEvent"),
    ]

    _events = None

    def addEvent(self, newObject):
        if not (isinstance(newObject, ProbeEvent)
            or isinstance(newObject, SoftwareIncrement)):
            raise TypeError("argument must be of ProbeEvent or "
                "SoftwareIncrement type")

        if not self._events:
            self._events = []

        self._events.append(newObject)

    # Override the normal SimObject::regProbeListeners method and
    # register deferred event handlers.
    def regProbeListeners(self):
        for event in self._events:
           event.register()

        self.getCCObject().regProbeListeners()

    def addArchEvents(self,
                      cpu=None,
                      itb=None, dtb=None,
                      icache=None, dcache=None,
                      l2cache=None):
        """Add architected events to the PMU.

        This method can be called multiple times with only a subset of
        the keyword arguments set. This enables event registration in
        configuration scripts to happen closer to the instantiation of
        the instrumented objects (e.g., the memory system) instead of
        a central point.

        CPU events should also be registered once per CPU that is
        sharing the PMU (e.g., when switching between CPU models).
        """

        bpred = getattr(cpu, "branchPred", None) if cpu else None
        if bpred is not None and isNullPointer(bpred):
            bpred = None

        self.addEvent(SoftwareIncrement(self,0x00))
        # 0x01: L1I_CACHE_REFILL
        self.addEvent(ProbeEvent(self,0x02, itb, "Refills"))
        # 0x03: L1D_CACHE_REFILL
        # 0x04: L1D_CACHE
        self.addEvent(ProbeEvent(self,0x05, dtb, "Refills"))
        self.addEvent(ProbeEvent(self,0x06, cpu, "RetiredLoads"))
        self.addEvent(ProbeEvent(self,0x07, cpu, "RetiredStores"))
        self.addEvent(ProbeEvent(self,0x08, cpu, "RetiredInsts"))
        # 0x09: EXC_TAKEN
        # 0x0A: EXC_RETURN
        # 0x0B: CID_WRITE_RETIRED
        self.addEvent(ProbeEvent(self,0x0C, cpu, "RetiredBranches"))
        # 0x0D: BR_IMMED_RETIRED
        # 0x0E: BR_RETURN_RETIRED
        # 0x0F: UNALIGEND_LDST_RETIRED
        self.addEvent(ProbeEvent(self,0x10, bpred, "Misses"))
        self.addEvent(ProbeEvent(self, ARCH_EVENT_CORE_CYCLES, cpu,
                                 "ActiveCycles"))
        self.addEvent(ProbeEvent(self,0x12, bpred, "Branches"))
        self.addEvent(ProbeEvent(self,0x13, cpu, "RetiredLoads",
                                 "RetiredStores"))
        # 0x14: L1I_CACHE
        # 0x15: L1D_CACHE_WB
        # 0x16: L2D_CACHE
        # 0x17: L2D_CACHE_REFILL
        # 0x18: L2D_CACHE_WB
        # 0x19: BUS_ACCESS
        # 0x1A: MEMORY_ERROR
        # 0x1B: INST_SPEC
        # 0x1C: TTBR_WRITE_RETIRED
        # 0x1D: BUS_CYCLES
        # 0x1E: CHAIN
        # 0x1F: L1D_CACHE_ALLOCATE
        # 0x20: L2D_CACHE_ALLOCATE
        # 0x21: BR_RETIRED
        # 0x22: BR_MIS_PRED_RETIRED
        # 0x23: STALL_FRONTEND
        # 0x24: STALL_BACKEND
        # 0x25: L1D_TLB
        # 0x26: L1I_TLB
        # 0x27: L2I_CACHE
        # 0x28: L2I_CACHE_REFILL
        # 0x29: L3D_CACHE_ALLOCATE
        # 0x2A: L3D_CACHE_REFILL
        # 0x2B: L3D_CACHE
        # 0x2C: L3D_CACHE_WB
        # 0x2D: L2D_TLB_REFILL
        # 0x2E: L2I_TLB_REFILL
        # 0x2F: L2D_TLB
        # 0x30: L2I_TLB

    cycleEventId = Param.Int(ARCH_EVENT_CORE_CYCLES, "Cycle event id")
    platform = Param.Platform(Parent.any, "Platform this device is part of.")
    eventCounters = Param.Int(31, "Number of supported PMU counters")
    interrupt = Param.ArmInterruptPin("PMU interrupt")