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# Copyright 2019 Google, Inc.
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from m5.params import *
from m5.proxy import *

from m5.objects.BaseCPU import BaseCPU
from m5.objects.BaseInterrupts import BaseInterrupts
from m5.objects.BaseISA import BaseISA
from m5.objects.BaseTLB import BaseTLB
from m5.objects.BaseMMU import BaseMMU


class IrisTLB(BaseTLB):
    type = "IrisTLB"
    cxx_class = "gem5::Iris::TLB"
    cxx_header = "arch/arm/fastmodel/iris/tlb.hh"


class IrisMMU(BaseMMU):
    type = "IrisMMU"
    cxx_class = "gem5::Iris::MMU"
    cxx_header = "arch/arm/fastmodel/iris/mmu.hh"
    itb = IrisTLB(entry_type="instruction")
    dtb = IrisTLB(entry_type="data")


class IrisInterrupts(BaseInterrupts):
    type = "IrisInterrupts"
    cxx_class = "gem5::Iris::Interrupts"
    cxx_header = "arch/arm/fastmodel/iris/interrupts.hh"


class IrisISA(BaseISA):
    type = "IrisISA"
    cxx_class = "gem5::Iris::ISA"
    cxx_header = "arch/arm/fastmodel/iris/isa.hh"


class IrisCPU:
    ArchMMU = IrisMMU
    ArchInterrupts = IrisInterrupts
    ArchISA = IrisISA


class IrisBaseCPU(BaseCPU, IrisCPU):
    type = "IrisBaseCPU"
    abstract = True
    cxx_class = "gem5::Iris::BaseCPU"
    cxx_header = "arch/arm/fastmodel/iris/cpu.hh"

    @classmethod
    def memory_mode(cls):
        return "atomic_noncaching"

    @classmethod
    def require_caches(cls):
        return False

    @classmethod
    def support_take_over(cls):
        # TODO Make this work.
        return False

    evs = Param.SystemC_ScModule(
        "Fast model exported virtual subsystem holding cores"
    )
    thread_paths = VectorParam.String(
        "Sub-paths to elements in the EVS which support a thread context"
    )

    mmu = IrisMMU()

    def createThreads(self):
        if len(self.isa) == 0:
            self.isa = [IrisISA() for i in range(self.numThreads)]
        else:
            assert len(self.isa) == int(self.numThreads)