# -*- mode:python -*-

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from m5.objects.ArmSystem import ArmRelease
from m5.objects.ArmTLB import ArmTLB, 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'

    # L2 TLBs
    l2_shared = ArmTLB(entry_type="unified", size=1280,
        partial_levels=["L2"])

    # L1 TLBs
    itb = ArmTLB(entry_type="instruction", next_level=Parent.l2_shared)
    dtb = ArmTLB(entry_type="data", next_level=Parent.l2_shared)

    stage2_itb = Param.ArmTLB(
        ArmStage2TLB(entry_type="instruction"),
        "Stage 2 Instruction TLB")
    stage2_dtb = Param.ArmTLB(
        ArmStage2TLB(entry_type="data"),
        "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")

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

    release_se = Param.ArmRelease(Parent.isa[0].release_se,
        "Set of features/extensions to use in SE mode")

    @classmethod
    def walkerPorts(cls):
        return ["mmu.itb_walker.port", "mmu.dtb_walker.port",
                "mmu.stage2_itb_walker.port", "mmu.stage2_dtb_walker.port"]

    def connectWalkerPorts(self, iport, dport):
        self.itb_walker.port = iport
        self.dtb_walker.port = dport
        self.stage2_itb_walker.port = iport
        self.stage2_dtb_walker.port = dport