5 * linux/include/asm/irq.h
7 * (C) 1992, 1993 Linus Torvalds, (C) 1997 Ingo Molnar
9 * IRQ/IPI changes taken from work by Thomas Radke
10 * <tomsoft@informatik.tu-chemnitz.de>
13 #include <linux/config.h>
18 * 16 8259A IRQ's, 208 potential APIC interrupt sources.
19 * Right now the APIC is mostly only used for SMP.
20 * 256 vectors is an architectural limit. (we can have
21 * more than 256 devices theoretically, but they will
22 * have to use shared interrupts)
23 * Since vectors 0x00-0x1f are used/reserved for the CPU,
24 * the usable vector space is 0x20-0xff (224 vectors)
26 #ifdef CONFIG_X86_IO_APIC
32 static __inline__ int irq_cannonicalize(int irq)
34 return ((irq == 2) ? 9 : irq);
37 extern void disable_irq(unsigned int);
38 extern void disable_irq_nosync(unsigned int);
39 extern void enable_irq(unsigned int);
40 extern void release_x86_irqs(struct task_struct *);
42 #ifdef CONFIG_X86_LOCAL_APIC
43 #define ARCH_HAS_NMI_WATCHDOG /* See include/linux/nmi.h */
46 #endif /* _ASM_IRQ_H */