150 lines
4.2 KiB
C
150 lines
4.2 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_IRQ_VECTORS_H
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#define _ASM_X86_IRQ_VECTORS_H
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#include <linux/threads.h>
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/*
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* Linux IRQ vector layout.
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*
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* There are 256 IDT entries (per CPU - each entry is 8 bytes) which can
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* be defined by Linux. They are used as a jump table by the CPU when a
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* given vector is triggered - by a CPU-external, CPU-internal or
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* software-triggered event.
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*
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* Linux sets the kernel code address each entry jumps to early during
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* bootup, and never changes them. This is the general layout of the
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* IDT entries:
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*
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* Vectors 0 ... 31 : system traps and exceptions - hardcoded events
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* Vectors 32 ... 127 : device interrupts
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* Vector 128 : legacy int80 syscall interface
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* Vectors 129 ... LOCAL_TIMER_VECTOR-1
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* Vectors LOCAL_TIMER_VECTOR ... 255 : special interrupts
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*
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* 64-bit x86 has per CPU IDT tables, 32-bit has one shared IDT table.
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*
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* This file enumerates the exact layout of them:
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*/
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/* This is used as an interrupt vector when programming the APIC. */
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#define NMI_VECTOR 0x02
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/*
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* IDT vectors usable for external interrupt sources start at 0x20.
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* (0x80 is the syscall vector, 0x30-0x3f are for ISA)
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*/
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#define FIRST_EXTERNAL_VECTOR 0x20
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/*
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* Reserve the lowest usable vector (and hence lowest priority) 0x20 for
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* triggering cleanup after irq migration. 0x21-0x2f will still be used
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* for device interrupts.
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*/
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#define IRQ_MOVE_CLEANUP_VECTOR FIRST_EXTERNAL_VECTOR
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#define IA32_SYSCALL_VECTOR 0x80
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/*
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* Vectors 0x30-0x3f are used for ISA interrupts.
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* round up to the next 16-vector boundary
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*/
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#define ISA_IRQ_VECTOR(irq) (((FIRST_EXTERNAL_VECTOR + 16) & ~15) + irq)
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/*
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* Special IRQ vectors used by the SMP architecture, 0xf0-0xff
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*
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* some of the following vectors are 'rare', they are merged
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* into a single vector (CALL_FUNCTION_VECTOR) to save vector space.
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* TLB, reschedule and local APIC vectors are performance-critical.
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*/
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#define SPURIOUS_APIC_VECTOR 0xff
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/*
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* Sanity check
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*/
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#if ((SPURIOUS_APIC_VECTOR & 0x0F) != 0x0F)
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# error SPURIOUS_APIC_VECTOR definition error
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#endif
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#define ERROR_APIC_VECTOR 0xfe
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#define RESCHEDULE_VECTOR 0xfd
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#define CALL_FUNCTION_VECTOR 0xfc
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#define CALL_FUNCTION_SINGLE_VECTOR 0xfb
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#define THERMAL_APIC_VECTOR 0xfa
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#define THRESHOLD_APIC_VECTOR 0xf9
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#define REBOOT_VECTOR 0xf8
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/*
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* Generic system vector for platform specific use
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*/
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#define X86_PLATFORM_IPI_VECTOR 0xf7
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/*
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* IRQ work vector:
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*/
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#define IRQ_WORK_VECTOR 0xf6
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/* 0xf5 - unused, was UV_BAU_MESSAGE */
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#define DEFERRED_ERROR_VECTOR 0xf4
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/* Vector on which hypervisor callbacks will be delivered */
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#define HYPERVISOR_CALLBACK_VECTOR 0xf3
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/* Vector for KVM to deliver posted interrupt IPI */
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#ifdef CONFIG_HAVE_KVM
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#define POSTED_INTR_VECTOR 0xf2
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#define POSTED_INTR_WAKEUP_VECTOR 0xf1
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#define POSTED_INTR_NESTED_VECTOR 0xf0
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#endif
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#define MANAGED_IRQ_SHUTDOWN_VECTOR 0xef
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#if IS_ENABLED(CONFIG_HYPERV)
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#define HYPERV_REENLIGHTENMENT_VECTOR 0xee
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#define HYPERV_STIMER0_VECTOR 0xed
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#endif
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#define LOCAL_TIMER_VECTOR 0xec
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#define NR_VECTORS 256
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#ifdef CONFIG_X86_LOCAL_APIC
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#define FIRST_SYSTEM_VECTOR LOCAL_TIMER_VECTOR
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#else
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#define FIRST_SYSTEM_VECTOR NR_VECTORS
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#endif
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#define NR_EXTERNAL_VECTORS (FIRST_SYSTEM_VECTOR - FIRST_EXTERNAL_VECTOR)
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#define NR_SYSTEM_VECTORS (NR_VECTORS - FIRST_SYSTEM_VECTOR)
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/*
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* Size the maximum number of interrupts.
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*
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* If the irq_desc[] array has a sparse layout, we can size things
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* generously - it scales up linearly with the maximum number of CPUs,
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* and the maximum number of IO-APICs, whichever is higher.
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*
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* In other cases we size more conservatively, to not create too large
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* static arrays.
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*/
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#define NR_IRQS_LEGACY 16
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#define CPU_VECTOR_LIMIT (64 * NR_CPUS)
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#define IO_APIC_VECTOR_LIMIT (32 * MAX_IO_APICS)
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#if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_PCI_MSI)
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#define NR_IRQS \
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(CPU_VECTOR_LIMIT > IO_APIC_VECTOR_LIMIT ? \
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(NR_VECTORS + CPU_VECTOR_LIMIT) : \
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(NR_VECTORS + IO_APIC_VECTOR_LIMIT))
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#elif defined(CONFIG_X86_IO_APIC)
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#define NR_IRQS (NR_VECTORS + IO_APIC_VECTOR_LIMIT)
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#elif defined(CONFIG_PCI_MSI)
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#define NR_IRQS (NR_VECTORS + CPU_VECTOR_LIMIT)
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#else
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#define NR_IRQS NR_IRQS_LEGACY
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#endif
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#endif /* _ASM_X86_IRQ_VECTORS_H */
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