linux/arch/x86/include/asm/irq_vectors.h

#ifndef _ASM_X86_IRQ_VECTORS_H
#define _ASM_X86_IRQ_VECTORS_H

#include <linux/threads.h>

#define NMI_VECTOR		0x02

/*
 * IDT vectors usable for external interrupt sources start
 * at 0x20:
 */
#define FIRST_EXTERNAL_VECTOR	0x20

#ifdef CONFIG_X86_32
# define SYSCALL_VECTOR		0x80
#else
# define IA32_SYSCALL_VECTOR	0x80
#endif

/*
 * Reserve the lowest usable priority level 0x20 - 0x2f for triggering
 * cleanup after irq migration.
 */
#define IRQ_MOVE_CLEANUP_VECTOR	FIRST_EXTERNAL_VECTOR

/*
 * Vectors 0x30-0x3f are used for ISA interrupts.
 */
#define IRQ0_VECTOR		(FIRST_EXTERNAL_VECTOR + 0x10)
#define IRQ1_VECTOR		(IRQ0_VECTOR + 1)
#define IRQ2_VECTOR		(IRQ0_VECTOR + 2)
#define IRQ3_VECTOR		(IRQ0_VECTOR + 3)
#define IRQ4_VECTOR		(IRQ0_VECTOR + 4)
#define IRQ5_VECTOR		(IRQ0_VECTOR + 5)
#define IRQ6_VECTOR		(IRQ0_VECTOR + 6)
#define IRQ7_VECTOR		(IRQ0_VECTOR + 7)
#define IRQ8_VECTOR		(IRQ0_VECTOR + 8)
#define IRQ9_VECTOR		(IRQ0_VECTOR + 9)
#define IRQ10_VECTOR		(IRQ0_VECTOR + 10)
#define IRQ11_VECTOR		(IRQ0_VECTOR + 11)
#define IRQ12_VECTOR		(IRQ0_VECTOR + 12)
#define IRQ13_VECTOR		(IRQ0_VECTOR + 13)
#define IRQ14_VECTOR		(IRQ0_VECTOR + 14)
#define IRQ15_VECTOR		(IRQ0_VECTOR + 15)

/*
 * 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

#ifdef CONFIG_X86_32
/* 0xf8 - 0xf9 : free */
#else
# define THRESHOLD_APIC_VECTOR		0xf9
# define UV_BAU_MESSAGE			0xf8
#endif

/* f0-f7 used for spreading out TLB flushes: */
#define INVALIDATE_TLB_VECTOR_END	0xf7
#define INVALIDATE_TLB_VECTOR_START	0xf0
#define NUM_INVALIDATE_TLB_VECTORS	8

/*
 * Local APIC timer IRQ vector is on a different priority level,
 * to work around the 'lost local interrupt if more than 2 IRQ
 * sources per level' errata.
 */
#define LOCAL_TIMER_VECTOR	0xef

/*
 * Performance monitoring interrupt vector:
 */
#define LOCAL_PERF_VECTOR	0xee

/*
 * First APIC vector available to drivers: (vectors 0x30-0xee) we
 * start at 0x31(0x41) to spread out vectors evenly between priority
 * levels. (0x80 is the syscall vector)
 */
#define FIRST_DEVICE_VECTOR	(IRQ15_VECTOR + 2)

#define NR_VECTORS		256

#define FPU_IRQ			13

#define	FIRST_VM86_IRQ		3
#define LAST_VM86_IRQ		15
#define invalid_vm86_irq(irq)	((irq) < 3 || (irq) > 15)

#define NR_IRQS_LEGACY		16

#if defined(CONFIG_X86_IO_APIC) && !defined(CONFIG_X86_VOYAGER)

#include <asm/apicnum.h>	/* need MAX_IO_APICS */

#ifndef CONFIG_SPARSE_IRQ
# if NR_CPUS < MAX_IO_APICS
#  define NR_IRQS (NR_VECTORS + (32 * NR_CPUS))
# else
#  define NR_IRQS (NR_VECTORS + (32 * MAX_IO_APICS))
# endif
#else

# define NR_IRQS					\
	((8 * NR_CPUS) > (32 * MAX_IO_APICS) ?		\
		(NR_VECTORS + (8 * NR_CPUS)) :		\
		(NR_VECTORS + (32 * MAX_IO_APICS)))	\

#endif

#elif defined(CONFIG_X86_VOYAGER)

# define NR_IRQS		224

#else /* IO_APIC || VOYAGER */

# define NR_IRQS		16

#endif

#endif /* _ASM_X86_IRQ_VECTORS_H */