linux/include/asm-x86/mach-default/irq_vectors.h
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   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/*
  54 * Local APIC timer IRQ vector is on a different priority level,
  55 * to work around the 'lost local interrupt if more than 2 IRQ
  56 * sources per level' errata.
  57 */
  58#define LOCAL_TIMER_VECTOR      0xef
  59
  60/*
  61 * First APIC vector available to drivers: (vectors 0x30-0xee)
  62 * we start at 0x31 to spread out vectors evenly between priority
  63 * levels. (0x80 is the syscall vector)
  64 */
  65#define FIRST_DEVICE_VECTOR     0x31
  66#define FIRST_SYSTEM_VECTOR     0xef
  67
  68#define TIMER_IRQ 0
  69
  70/*
  71 * 16 8259A IRQ's, 208 potential APIC interrupt sources.
  72 * Right now the APIC is mostly only used for SMP.
  73 * 256 vectors is an architectural limit. (we can have
  74 * more than 256 devices theoretically, but they will
  75 * have to use shared interrupts)
  76 * Since vectors 0x00-0x1f are used/reserved for the CPU,
  77 * the usable vector space is 0x20-0xff (224 vectors)
  78 */
  79
  80/*
  81 * The maximum number of vectors supported by i386 processors
  82 * is limited to 256. For processors other than i386, NR_VECTORS
  83 * should be changed accordingly.
  84 */
  85#define NR_VECTORS 256
  86
  87#include "irq_vectors_limits.h"
  88
  89#define FPU_IRQ                 13
  90
  91#define FIRST_VM86_IRQ          3
  92#define LAST_VM86_IRQ           15
  93#define invalid_vm86_irq(irq)   ((irq) < 3 || (irq) > 15)
  94
  95
  96#endif /* _ASM_IRQ_VECTORS_H */
  97
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