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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. Change-Id: I4cf4744bd6efd68b72e2c380269de4181dc80bd9 Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
123 lines
3.8 KiB
Plaintext
123 lines
3.8 KiB
Plaintext
# Kconfig - interrupt controller configuration options
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#
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# Copyright (c) 2015 Intel Corporation
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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menu "Interrupt Controllers"
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config LOAPIC
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bool "LOAPIC"
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default n
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select IOAPIC
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depends on X86
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help
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This option selects local APIC as the interrupt controller.
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config LOAPIC_DEBUG
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bool "LOAPIC Debug"
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default n
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depends on LOAPIC
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help
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This option enable debugging for the LOAPIC driver.
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config LOAPIC_BASE_ADDRESS
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hex "Local APIC Base Address"
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default 0xFEE00000
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depends on LOAPIC || MVIC
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help
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This option specifies the base address of the Local APIC device.
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config LOAPIC_SPURIOUS_VECTOR
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bool "Handle LOAPIC spurious interrupts"
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default n
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depends on LOAPIC
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help
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A special situation may occur when a processor raises its task
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priority to be greater than or equal to the level of the
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interrupt for which the processor INTR signal is currently being
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asserted. If at the time the INTA cycle is issued, the
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interrupt that was to be dispensed has become masked (programmed
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by software), the local APIC will deliver a spurious-interrupt
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vector. Dispensing the spurious-interrupt vector does not affect
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the ISR, so the handler for this vector should return without an EOI.
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From x86 manual Volume 3 Section 10.9.
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config LOAPIC_SPURIOUS_VECTOR_ID
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int "LOAPIC spurious vector ID"
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default -1
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depends on LOAPIC_SPURIOUS_VECTOR
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help
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IDT vector to use for spurious LOAPIC interrupts. Note that some
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arches (P6, Pentium) ignore the low 4 bits and fix them at 0xF.
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If this value is left at -1 the last entry in the IDT will be used.
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config IOAPIC
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bool "IO-APIC"
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default y
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depends on LOAPIC
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help
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This option signifies that the target has an IO-APIC device. This
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capability allows IO-APIC-dependent code to be included.
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config IOAPIC_DEBUG
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bool "IO-APIC Debugging"
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default n
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depends on IOAPIC
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help
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Enable debugging for IO-APIC driver.
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config IOAPIC_BASE_ADDRESS
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hex "IO-APIC Base Address"
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default 0xFEC00000
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depends on IOAPIC || MVIC
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help
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This option specifies the base address of the IO-APIC device.
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config IOAPIC_NUM_RTES
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int "Number of Redirection Table Entries available"
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default 24
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depends on IOAPIC
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help
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This option indicates the maximum number of Redirection Table Entries
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(RTEs) (one per IRQ available to the IO-APIC) made available to the
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kernel, regardless of the number provided by the hardware itself. For
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most efficient usage of memory, it should match the number of IRQ lines
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needed by devices connected to the IO-APIC.
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config MVIC
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bool "Intel Quark D2000 Interrupt Controller (MVIC)"
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default n
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depends on X86
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help
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The MVIC (Intel Quark microcontroller D2000 Interrupt Controller) is
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configured by default to support 32 external interrupt lines. Unlike the
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traditional IA LAPIC/IOAPIC, the interrupt vectors in MVIC are fixed and
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not programmable. In addition, the priorities of these interrupt
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lines are also fixed.
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config ARCV2_INTERRUPT_UNIT
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bool "ARCv2 Interrupt Unit"
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default y
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depends on ARC
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help
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The ARCv2 interrupt unit has 16 allocated exceptions associated with
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vectors 0 to 15 and 240 interrupts associated with vectors 16 to 255.
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The interrupt unit is optional in the ARCv2-based processors. When
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building a processor, you can configure the processor to include an
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interrupt unit. The ARCv2 interrupt unit is highly programmable.
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endmenu
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