2 * Copyright (C) 2004-2006 Atmel Corporation
4 * Based on arch/i386/kernel/irq.c
5 * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 * This file contains the code used by various IRQ handling routines:
12 * asking for different IRQ's should be done through these routines
13 * instead of just grabbing them. Thus setups with different IRQ numbers
14 * shouldn't result in any weird surprises, and installing new handlers
17 * IRQ's are in fact implemented a bit like signal handlers for the kernel.
18 * Naturally it's not a 1:1 relation, but there are similarities.
21 #include <linux/interrupt.h>
22 #include <linux/irq.h>
23 #include <linux/kernel_stat.h>
24 #include <linux/proc_fs.h>
25 #include <linux/seq_file.h>
26 #include <linux/sysdev.h>
29 * 'what should we do if we get a hw irq event on an illegal vector'.
30 * each architecture has to answer this themselves.
32 void ack_bad_irq(unsigned int irq)
34 printk("unexpected IRQ %u\n", irq);
38 int show_interrupts(struct seq_file *p, void *v)
40 int i = *(loff_t *)v, cpu;
41 struct irqaction *action;
46 for_each_online_cpu(cpu)
47 seq_printf(p, "CPU%d ", cpu);
52 spin_lock_irqsave(&irq_desc[i].lock, flags);
53 action = irq_desc[i].action;
57 seq_printf(p, "%3d: ", i);
58 for_each_online_cpu(cpu)
59 seq_printf(p, "%10u ", kstat_cpu(cpu).irqs[i]);
60 seq_printf(p, " %8s", irq_desc[i].chip->name ? : "-");
61 seq_printf(p, " %s", action->name);
62 for (action = action->next; action; action = action->next)
63 seq_printf(p, ", %s", action->name);
67 spin_unlock_irqrestore(&irq_desc[i].lock, flags);