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# Copyright (c) 2012 ARM Limited
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#
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# to a hardware implementation of the functionality of the software
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#
# Copyright (c) 2008 The Regents of The University of Michigan
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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)