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/* 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 ... INVALIDATE_TLB_VECTOR_START-1 except 204 : device interrupts
 *  Vectors INVALIDATE_TLB_VECTOR_START ... 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
/*
 * We start allocating at 0x21 to spread out vectors evenly between
 * priority levels. (0x80 is the syscall vector)
 */
#define VECTOR_OFFSET_START		1

/*
 * 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
#define LOCAL_TIMER_VECTOR		0xee

#define NR_VECTORS			 256

#ifdef CONFIG_X86_LOCAL_APIC
#define FIRST_SYSTEM_VECTOR		LOCAL_TIMER_VECTOR
#else
#define FIRST_SYSTEM_VECTOR		NR_VECTORS
#endif

#define FPU_IRQ				  13

/*
 * 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 */

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fpu Folder 0755
numachip Folder 0755
trace Folder 0755
uv Folder 0755
xen Folder 0755
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acenv.h File 1.56 KB 0644
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alternative-asm.h File 2.43 KB 0644
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