include/asm-i386/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 #define NR_IRQS 224
  25
  26 static __inline__ int irq_cannonicalize(int irq)
  27 {
  28         return ((irq == 2) ? 9 : irq);
  29 }
  30
  31 extern void disable_irq(unsigned int);
  32 extern void disable_irq_nosync(unsigned int);
  33 extern void enable_irq(unsigned int);
  34
  35 #endif /* _ASM_IRQ_H */