irq.h
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:1k
- #ifndef _ASM_IRQ_H
- #define _ASM_IRQ_H
- /*
- * linux/include/asm/irq.h
- *
- * (C) 1992, 1993 Linus Torvalds, (C) 1997 Ingo Molnar
- *
- * IRQ/IPI changes taken from work by Thomas Radke
- * <tomsoft@informatik.tu-chemnitz.de>
- */
- #define TIMER_IRQ 0
- /*
- * 16 8259A IRQ's, 208 potential APIC interrupt sources.
- * Right now the APIC is mostly only used for SMP.
- * 256 vectors is an architectural limit. (we can have
- * more than 256 devices theoretically, but they will
- * have to use shared interrupts)
- * Since vectors 0x00-0x1f are used/reserved for the CPU,
- * the usable vector space is 0x20-0xff (224 vectors)
- */
- #ifdef CONFIG_X86_IO_APIC
- #define NR_IRQS 224
- #else
- #define NR_IRQS 16
- #endif
- static __inline__ int irq_cannonicalize(int irq)
- {
- return ((irq == 2) ? 9 : irq);
- }
- extern void disable_irq(unsigned int);
- extern void disable_irq_nosync(unsigned int);
- extern void enable_irq(unsigned int);
- #endif /* _ASM_IRQ_H */