include/asm-i386/mach-default/irq_vectors.h

   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 */