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# Copyright (c) 2019 Intel Corporation
# SPDX-License-Identifier: Apache-2.0
menuconfig LOAPIC
bool "LOAPIC"
depends on X86
help
This option selects local APIC as the interrupt controller.
if LOAPIC
config LOAPIC_BASE_ADDRESS
hex "Local APIC Base Address"
default 0xFEE00000
help
This option specifies the base address of the Local APIC device.
config X2APIC
bool "Access local APIC in x2APIC mode"
help
If your local APIC supports x2APIC mode, turn this on.
config LOAPIC_SPURIOUS_VECTOR
bool "Handle LOAPIC spurious interrupts"
help
A special situation may occur when a processor raises its task
priority to be greater than or equal to the level of the
interrupt for which the processor INTR signal is currently being
asserted. If at the time the INTA cycle is issued, the
interrupt that was to be dispensed has become masked (programmed
by software), the local APIC will deliver a spurious-interrupt
vector. Dispensing the spurious-interrupt vector does not affect
the ISR, so the handler for this vector should return without an EOI.
From x86 manual Volume 3 Section 10.9.
config LOAPIC_SPURIOUS_VECTOR_ID
int "LOAPIC spurious vector ID"
default -1
depends on LOAPIC_SPURIOUS_VECTOR
help
IDT vector to use for spurious LOAPIC interrupts. Note that some
arches (P6, Pentium) ignore the low 4 bits and fix them at 0xF.
If this value is left at -1 the last entry in the IDT will be used.
config IOAPIC
bool "IO-APIC"
default y
help
This option signifies that the target has an IO-APIC device. This
capability allows IO-APIC-dependent code to be included.
config IOAPIC_MASK_RTE
bool "Mask out RTE entries on boot"
default y
depends on IOAPIC
help
At boot, mask all IOAPIC RTEs if they may be in an undefined state.
You don't need this if the RTEs are either all guaranteed to be masked
when the OS starts up, or a previous boot stage has done some IOAPIC
configuration that needs to be preserved.
endif # LOAPIC