include/asm-x86_64/irq.h

   1 #ifndef _ASM_IRQ_H
   2 #define _ASM_IRQ_H
   3
   4 /*
   5  *      linux/include/asm/irq.h
   6  *
   7  *      (C) 1992, 1993 Linus Torvalds, (C) 1997 Ingo Molnar
   8  *
   9  *      IRQ/IPI changes taken from work by Thomas Radke
  10  *      <tomsoft@informatik.tu-chemnitz.de>
  11  */
  12
  13 #define TIMER_IRQ 0
  14
  15 /*
  16  * 16 8259A IRQ's, 208 potential APIC interrupt sources.
  17  * Right now the APIC is mostly only used for SMP.
  18  * 256 vectors is an architectural limit. (we can have
  19  * more than 256 devices theoretically, but they will
  20  * have to use shared interrupts)
  21  * Since vectors 0x00-0x1f are used/reserved for the CPU,
  22  * the usable vector space is 0x20-0xff (224 vectors)
  23  */
  24
  25 /*
  26  * The maximum number of vectors supported by x86_64 processors
  27  * is limited to 256. For processors other than x86_64, NR_VECTORS
  28  * should be changed accordingly.
  29  */
  30 #define NR_VECTORS 256
  31
  32 #define FIRST_SYSTEM_VECTOR     0xef   /* duplicated in hw_irq.h */
  33
  34 #define NR_IRQS (NR_VECTORS + (32 *NR_CPUS))
  35 #define NR_IRQ_VECTORS NR_IRQS
  36
  37 static __inline__ int irq_canonicalize(int irq)
  38 {
  39         return ((irq == 2) ? 9 : irq);
  40 }
  41
  42 #define ARCH_HAS_NMI_WATCHDOG           /* See include/linux/nmi.h */
  43
  44 #ifdef CONFIG_HOTPLUG_CPU
  45 #include <linux/cpumask.h>
  46 extern void fixup_irqs(cpumask_t map);
  47 #endif
  48
  49 #define __ARCH_HAS_DO_SOFTIRQ 1
  50
  51 #endif /* _ASM_IRQ_H */