147 lines
4.0 KiB
C
147 lines
4.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _ASM_X86_IRQ_VECTORS_H
|
|
#define _ASM_X86_IRQ_VECTORS_H
|
|
|
|
#include <linux/threads.h>
|
|
/*
|
|
* Linux IRQ vector layout.
|
|
*
|
|
* There are 256 IDT entries (per CPU - each entry is 8 bytes) which can
|
|
* be defined by Linux. They are used as a jump table by the CPU when a
|
|
* given vector is triggered - by a CPU-external, CPU-internal or
|
|
* software-triggered event.
|
|
*
|
|
* Linux sets the kernel code address each entry jumps to early during
|
|
* bootup, and never changes them. This is the general layout of the
|
|
* IDT entries:
|
|
*
|
|
* Vectors 0 ... 31 : system traps and exceptions - hardcoded events
|
|
* Vectors 32 ... 127 : device interrupts
|
|
* Vector 128 : legacy int80 syscall interface
|
|
* Vectors 129 ... LOCAL_TIMER_VECTOR-1
|
|
* Vectors LOCAL_TIMER_VECTOR ... 255 : special interrupts
|
|
*
|
|
* 64-bit x86 has per CPU IDT tables, 32-bit has one shared IDT table.
|
|
*
|
|
* This file enumerates the exact layout of them:
|
|
*/
|
|
|
|
#define NMI_VECTOR 0x02
|
|
#define MCE_VECTOR 0x12
|
|
|
|
/*
|
|
* IDT vectors usable for external interrupt sources start at 0x20.
|
|
* (0x80 is the syscall vector, 0x30-0x3f are for ISA)
|
|
*/
|
|
#define FIRST_EXTERNAL_VECTOR 0x20
|
|
|
|
/*
|
|
* Reserve the lowest usable vector (and hence lowest priority) 0x20 for
|
|
* triggering cleanup after irq migration. 0x21-0x2f will still be used
|
|
* for device interrupts.
|
|
*/
|
|
#define IRQ_MOVE_CLEANUP_VECTOR FIRST_EXTERNAL_VECTOR
|
|
|
|
#define IA32_SYSCALL_VECTOR 0x80
|
|
|
|
/*
|
|
* Vectors 0x30-0x3f are used for ISA interrupts.
|
|
* round up to the next 16-vector boundary
|
|
*/
|
|
#define ISA_IRQ_VECTOR(irq) (((FIRST_EXTERNAL_VECTOR + 16) & ~15) + irq)
|
|
|
|
/*
|
|
* Special IRQ vectors used by the SMP architecture, 0xf0-0xff
|
|
*
|
|
* some of the following vectors are 'rare', they are merged
|
|
* into a single vector (CALL_FUNCTION_VECTOR) to save vector space.
|
|
* TLB, reschedule and local APIC vectors are performance-critical.
|
|
*/
|
|
|
|
#define SPURIOUS_APIC_VECTOR 0xff
|
|
/*
|
|
* Sanity check
|
|
*/
|
|
#if ((SPURIOUS_APIC_VECTOR & 0x0F) != 0x0F)
|
|
# error SPURIOUS_APIC_VECTOR definition error
|
|
#endif
|
|
|
|
#define ERROR_APIC_VECTOR 0xfe
|
|
#define RESCHEDULE_VECTOR 0xfd
|
|
#define CALL_FUNCTION_VECTOR 0xfc
|
|
#define CALL_FUNCTION_SINGLE_VECTOR 0xfb
|
|
#define THERMAL_APIC_VECTOR 0xfa
|
|
#define THRESHOLD_APIC_VECTOR 0xf9
|
|
#define REBOOT_VECTOR 0xf8
|
|
|
|
/*
|
|
* Generic system vector for platform specific use
|
|
*/
|
|
#define X86_PLATFORM_IPI_VECTOR 0xf7
|
|
|
|
/*
|
|
* IRQ work vector:
|
|
*/
|
|
#define IRQ_WORK_VECTOR 0xf6
|
|
|
|
#define UV_BAU_MESSAGE 0xf5
|
|
#define DEFERRED_ERROR_VECTOR 0xf4
|
|
|
|
/* Vector on which hypervisor callbacks will be delivered */
|
|
#define HYPERVISOR_CALLBACK_VECTOR 0xf3
|
|
|
|
/* Vector for KVM to deliver posted interrupt IPI */
|
|
#ifdef CONFIG_HAVE_KVM
|
|
#define POSTED_INTR_VECTOR 0xf2
|
|
#define POSTED_INTR_WAKEUP_VECTOR 0xf1
|
|
#define POSTED_INTR_NESTED_VECTOR 0xf0
|
|
#endif
|
|
|
|
#define MANAGED_IRQ_SHUTDOWN_VECTOR 0xef
|
|
|
|
#if IS_ENABLED(CONFIG_HYPERV)
|
|
#define HYPERV_REENLIGHTENMENT_VECTOR 0xee
|
|
#define HYPERV_STIMER0_VECTOR 0xed
|
|
#endif
|
|
|
|
#define LOCAL_TIMER_VECTOR 0xec
|
|
|
|
#define NR_VECTORS 256
|
|
|
|
#ifdef CONFIG_X86_LOCAL_APIC
|
|
#define FIRST_SYSTEM_VECTOR LOCAL_TIMER_VECTOR
|
|
#else
|
|
#define FIRST_SYSTEM_VECTOR NR_VECTORS
|
|
#endif
|
|
|
|
/*
|
|
* Size the maximum number of interrupts.
|
|
*
|
|
* If the irq_desc[] array has a sparse layout, we can size things
|
|
* generously - it scales up linearly with the maximum number of CPUs,
|
|
* and the maximum number of IO-APICs, whichever is higher.
|
|
*
|
|
* In other cases we size more conservatively, to not create too large
|
|
* static arrays.
|
|
*/
|
|
|
|
#define NR_IRQS_LEGACY 16
|
|
|
|
#define CPU_VECTOR_LIMIT (64 * NR_CPUS)
|
|
#define IO_APIC_VECTOR_LIMIT (32 * MAX_IO_APICS)
|
|
|
|
#if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_PCI_MSI)
|
|
#define NR_IRQS \
|
|
(CPU_VECTOR_LIMIT > IO_APIC_VECTOR_LIMIT ? \
|
|
(NR_VECTORS + CPU_VECTOR_LIMIT) : \
|
|
(NR_VECTORS + IO_APIC_VECTOR_LIMIT))
|
|
#elif defined(CONFIG_X86_IO_APIC)
|
|
#define NR_IRQS (NR_VECTORS + IO_APIC_VECTOR_LIMIT)
|
|
#elif defined(CONFIG_PCI_MSI)
|
|
#define NR_IRQS (NR_VECTORS + CPU_VECTOR_LIMIT)
|
|
#else
|
|
#define NR_IRQS NR_IRQS_LEGACY
|
|
#endif
|
|
|
|
#endif /* _ASM_X86_IRQ_VECTORS_H */
|