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Linux Cross Reference
Linux/include/asm-i386/irq.h

Version: ~ [ 2.4.0 ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~ 
  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 */
 36
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