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irq.c

/*
 * Copyright (C) 2004-2006 Atmel Corporation
 *
 * Based on arch/i386/kernel/irq.c
 *   Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/kernel_stat.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/sysdev.h>

/*
 * 'what should we do if we get a hw irq event on an illegal vector'.
 * each architecture has to answer this themselves.
 */
void ack_bad_irq(unsigned int irq)
{
      printk("unexpected IRQ %u\n", irq);
}

/* May be overridden by platform code */
int __weak nmi_enable(void)
{
      return -ENOSYS;
}

void __weak nmi_disable(void)
{

}

#ifdef CONFIG_PROC_FS
int show_interrupts(struct seq_file *p, void *v)
{
      int i = *(loff_t *)v, cpu;
      struct irqaction *action;
      unsigned long flags;

      if (i == 0) {
            seq_puts(p, "           ");
            for_each_online_cpu(cpu)
                  seq_printf(p, "CPU%d       ", cpu);
            seq_putc(p, '\n');
      }

      if (i < NR_IRQS) {
            spin_lock_irqsave(&irq_desc[i].lock, flags);
            action = irq_desc[i].action;
            if (!action)
                  goto unlock;

            seq_printf(p, "%3d: ", i);
            for_each_online_cpu(cpu)
                  seq_printf(p, "%10u ", kstat_irqs_cpu(i, cpu));
            seq_printf(p, " %8s", irq_desc[i].chip->name ? : "-");
            seq_printf(p, "  %s", action->name);
            for (action = action->next; action; action = action->next)
                  seq_printf(p, ", %s", action->name);

            seq_putc(p, '\n');
      unlock:
            spin_unlock_irqrestore(&irq_desc[i].lock, flags);
      }

      return 0;
}
#endif

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