# -*- mode:python -*-

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from m5.objects.ArmTLB import ArmITB, ArmDTB, ArmStage2TLB
from m5.objects.BaseMMU import BaseMMU
from m5.objects.ClockedObject import ClockedObject
from m5.params import *
from m5.proxy import *

# Basic stage 1 translation objects
class ArmTableWalker(ClockedObject):
    type = 'ArmTableWalker'
    cxx_class = 'gem5::ArmISA::TableWalker'
    cxx_header = "arch/arm/table_walker.hh"
    is_stage2 =  Param.Bool(False, "Is this object for stage 2 translation?")
    num_squash_per_cycle = Param.Unsigned(2,
            "Number of outstanding walks that can be squashed per cycle")

    port = RequestPort("Table Walker port")

    sys = Param.System(Parent.any, "system object parameter")

# Stage 2 translation objects, only used when virtualisation is being used
class ArmStage2TableWalker(ArmTableWalker):
    is_stage2 = True

class ArmMMU(BaseMMU):
    type = 'ArmMMU'
    cxx_class = 'gem5::ArmISA::MMU'
    cxx_header = 'arch/arm/mmu.hh'
    itb = ArmITB()
    dtb = ArmDTB()

    sys = Param.System(Parent.any, "system object parameter")

    stage2_itb = Param.ArmTLB(ArmStage2TLB(), "Stage 2 Instruction TLB")
    stage2_dtb = Param.ArmTLB(ArmStage2TLB(), "Stage 2 Data TLB")

    itb_walker = Param.ArmTableWalker(
        ArmTableWalker(), "HW Table walker")
    dtb_walker = Param.ArmTableWalker(
        ArmTableWalker(), "HW Table walker")

    stage2_itb_walker = Param.ArmTableWalker(
        ArmStage2TableWalker(), "HW Table walker")
    stage2_dtb_walker = Param.ArmTableWalker(
        ArmStage2TableWalker(), "HW Table walker")

    @classmethod
    def walkerPorts(cls):
        return ["mmu.itb_walker.port", "mmu.dtb_walker.port"]

    def connectWalkerPorts(self, iport, dport):
        self.itb_walker.port = iport
        self.dtb_walker.port = dport
