xref: /gem5/src/arch/x86/X86LocalApic.py

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# Authors: Gabe Black

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

from m5.objects.Device import BasicPioDevice
from m5.objects.ClockDomain import DerivedClockDomain

class X86LocalApic(BasicPioDevice):
    type = 'X86LocalApic'
    cxx_class = 'X86ISA::Interrupts'
    cxx_header = 'arch/x86/interrupts.hh'
    int_master = MasterPort("Port for sending interrupt messages")
    int_slave = SlavePort("Port for receiving interrupt messages")
    int_latency = Param.Latency('1ns', \
            "Latency for an interrupt to propagate through this device.")

    # pio_addr isn't used by the local APIC model since it's address is
    # calculated dynamically using the initial ID of the CPU it's attached to,
    # but it needs to be set to something to make the BasicPioDevice happy.
    pio_addr = 0x2000000000000000

    # The clock rate for the local APIC timer is supposed to be the "bus clock"
    # which we assume is 1/16th the rate of the CPU clock. I don't think this
    # is a hard rule, but seems to be true in practice. This can be overriden
    # in configs that use it.
    clk_domain = DerivedClockDomain(
            clk_domain=Parent.clk_domain, clk_divider=16)