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 #ifdef CONFIG_PCI_MSI
  35 #define NR_IRQS FIRST_SYSTEM_VECTOR
  36 #define NR_IRQ_VECTORS NR_IRQS
  37 #else
  38 #define NR_IRQS 224
  39 #define NR_IRQ_VECTORS 1024
  40 #endif
  41
  42 static __inline__ int irq_canonicalize(int irq)
  43 {
  44         return ((irq == 2) ? 9 : irq);
  45 }
  46
  47 #ifdef CONFIG_X86_LOCAL_APIC
  48 #define ARCH_HAS_NMI_WATCHDOG           /* See include/linux/nmi.h */
  49 #endif
  50
  51 struct irqaction;
  52 struct pt_regs;
  53 int handle_IRQ_event(unsigned int, struct pt_regs *, struct irqaction *);
  54
  55 #endif /* _ASM_IRQ_H */