irq.h
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:2k
- #ifdef __KERNEL__
- #ifndef _ASM_IRQ_H
- #define _ASM_IRQ_H
- /*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
- #include <asm/atomic.h>
- extern void disable_irq(unsigned int);
- extern void disable_irq_nosync(unsigned int);
- extern void enable_irq(unsigned int);
- /*
- * this is the maximum number of virtual irqs we will use.
- */
- #define NR_IRQS 512
- #define NUM_8259_INTERRUPTS 16
- /* Interrupt numbers are virtual in case they are sparsely
- * distributed by the hardware.
- */
- #define NR_HW_IRQS 8192
- extern unsigned short real_irq_to_virt_map[NR_HW_IRQS];
- extern unsigned short virt_irq_to_real_map[NR_IRQS];
- /* Create a mapping for a real_irq if it doesn't already exist.
- * Return the virtual irq as a convenience.
- */
- unsigned long virt_irq_create_mapping(unsigned long real_irq);
- /* These funcs map irqs between real and virtual */
- static inline unsigned long real_irq_to_virt(unsigned long real_irq) {
- return real_irq_to_virt_map[real_irq];
- }
- static inline unsigned long virt_irq_to_real(unsigned long virt_irq) {
- return virt_irq_to_real_map[virt_irq];
- }
- /*
- * This gets called from serial.c, which is now used on
- * powermacs as well as prep/chrp boxes.
- * Prep and chrp both have cascaded 8259 PICs.
- */
- static __inline__ int irq_cannonicalize(int irq)
- {
- return irq;
- }
- #endif /* _ASM_IRQ_H */
- #endif /* __KERNEL__ */