blob: 570678b1da950335f1821485745381f470af62ee [file] [log] [blame]
#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 <linux/config.h>
#include <linux/threads.h>
* Maximum number of interrupt sources that we can handle.
#define NR_IRQS 512
/* this number is used when no interrupt has been assigned */
#define NO_IRQ (-1)
* These constants are used for passing information about interrupt
* signal polarity and level/edge sensing to the low-level PIC chip
* drivers.
#define IRQ_SENSE_MASK 0x1
#define IRQ_SENSE_LEVEL 0x1 /* interrupt on active level */
#define IRQ_SENSE_EDGE 0x0 /* interrupt triggered by edge */
#define IRQ_POLARITY_POSITIVE 0x2 /* high level or low->high edge */
#define IRQ_POLARITY_NEGATIVE 0x0 /* low level or high->low edge */
#define get_irq_desc(irq) (&irq_desc[(irq)])
/* Define a way to iterate across irqs. */
#define for_each_irq(i) \
for ((i) = 0; (i) < NR_IRQS; ++(i))
/* Interrupt numbers are virtual in case they are sparsely
* distributed by the hardware.
extern unsigned int 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.
int virt_irq_create_mapping(unsigned int real_irq);
void virt_irq_init(void);
static inline unsigned int virt_irq_to_real(unsigned int virt_irq)
return virt_irq_to_real_map[virt_irq];
extern unsigned int real_irq_to_virt_slowpath(unsigned int real_irq);
* Because many systems have two overlapping names spaces for
* interrupts (ISA and XICS for example), and the ISA interrupts
* have historically not been easy to renumber, we allow ISA
* interrupts to take values 0 - 15, and shift up the remaining
* interrupts by 0x10.
extern int __irq_offset_value;
static inline int irq_offset_up(int irq)
return(irq + __irq_offset_value);
static inline int irq_offset_down(int irq)
return(irq - __irq_offset_value);
static inline int irq_offset_value(void)
return __irq_offset_value;
static __inline__ int irq_canonicalize(int irq)
return irq;
extern int distribute_irqs;
struct irqaction;
struct pt_regs;
* Per-cpu stacks for handling hard and soft interrupts.
extern struct thread_info *hardirq_ctx[NR_CPUS];
extern struct thread_info *softirq_ctx[NR_CPUS];
extern void irq_ctx_init(void);
extern void call_do_softirq(struct thread_info *tp);
extern int call_handle_IRQ_event(int irq, struct pt_regs *regs,
struct irqaction *action, struct thread_info *tp);
#define irq_ctx_init()
#endif /* _ASM_IRQ_H */
#endif /* __KERNEL__ */