1/* 2 * This file should contain #defines for all of the interrupt vector 3 * numbers used by this architecture. 4 * 5 * In addition, there are some standard defines: 6 * 7 * FIRST_EXTERNAL_VECTOR: 8 * The first free place for external interrupts 9 * 10 * SYSCALL_VECTOR: 11 * The IRQ vector a syscall makes the user to kernel transition 12 * under. 13 * 14 * TIMER_IRQ: 15 * The IRQ number the timer interrupt comes in at. 16 * 17 * NR_IRQS: 18 * The total number of interrupt vectors (including all the 19 * architecture specific interrupts) needed. 20 * 21 */ 22#ifndef _ASM_IRQ_VECTORS_H 23#define _ASM_IRQ_VECTORS_H 24 25/* 26 * IDT vectors usable for external interrupt sources start 27 * at 0x20: 28 */ 29#define FIRST_EXTERNAL_VECTOR 0x20 30 31#define SYSCALL_VECTOR 0x80 32 33/* 34 * Vectors 0x20-0x2f are used for ISA interrupts. 35 */ 36 37/* 38 * Special IRQ vectors used by the SMP architecture, 0xf0-0xff 39 * 40 * some of the following vectors are 'rare', they are merged 41 * into a single vector (CALL_FUNCTION_VECTOR) to save vector space. 42 * TLB, reschedule and local APIC vectors are performance-critical. 43 * 44 * Vectors 0xf0-0xfa are free (reserved for future Linux use). 45 */ 46#define SPURIOUS_APIC_VECTOR 0xff 47#define ERROR_APIC_VECTOR 0xfe 48#define INVALIDATE_TLB_VECTOR 0xfd 49#define RESCHEDULE_VECTOR 0xfc 50#define CALL_FUNCTION_VECTOR 0xfb 51 52#define THERMAL_APIC_VECTOR 0xf0 53#define LOCAL_TIMER_VECTOR 0xef 54 55/* 56 * First APIC vector available to drivers: (vectors 0x30-0xee) 57 * we start at 0x31 to spread out vectors evenly between priority 58 * levels. (0x80 is the syscall vector) 59 */ 60#define FIRST_DEVICE_VECTOR 0x31 61#define FIRST_SYSTEM_VECTOR 0xef 62 63#define TIMER_IRQ 0 64 65/* 66 * 16 8259A IRQ's, 208 potential APIC interrupt sources. 67 * Right now the APIC is mostly only used for SMP. 68 * 256 vectors is an architectural limit. (we can have 69 * more than 256 devices theoretically, but they will 70 * have to use shared interrupts) 71 * Since vectors 0x00-0x1f are used/reserved for the CPU, 72 * the usable vector space is 0x20-0xff (224 vectors) 73 */ 74 75/* 76 * The maximum number of vectors supported by i386 processors 77 * is limited to 256. For processors other than i386, NR_VECTORS 78 * should be changed accordingly. 79 */ 80#define NR_VECTORS 256 81 82#include "irq_vectors_limits.h" 83 84#define FPU_IRQ 13 85 86#define FIRST_VM86_IRQ 3 87#define LAST_VM86_IRQ 15 88#define invalid_vm86_irq(irq) ((irq) < 3 || (irq) > 15) 89 90 91#endif /* _ASM_IRQ_VECTORS_H */ 92