irq.c

来自「LINUX 2.6.17.4的源码」· C语言 代码 · 共 90 行

/*
 * linux/arch/m32r/kernel/irq.c
 *
 *  Copyright (c) 2003, 2004  Hitoshi Yamamoto
 *  Copyright (c) 2004  Hirokazu Takata <takata at linux-m32r.org>
 */

/*
 *	linux/arch/i386/kernel/irq.c
 *
 *	Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
 *
 * This file contains the lowest level m32r-specific interrupt
 * entry and irq statistics code. All the remaining irq logic is
 * done by the generic kernel/irq/ code and in the
 * m32r-specific irq controller code.
 */

#include <linux/kernel_stat.h>
#include <linux/interrupt.h>
#include <linux/seq_file.h>
#include <linux/module.h>
#include <asm/uaccess.h>

atomic_t irq_err_count;
atomic_t irq_mis_count;

/*
 * Generic, controller-independent functions:
 */

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

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

	if (i < NR_IRQS) {
		spin_lock_irqsave(&irq_desc[i].lock, flags);
		action = irq_desc[i].action;
		if (!action)
			goto skip;
		seq_printf(p, "%3d: ",i);
#ifndef CONFIG_SMP
		seq_printf(p, "%10u ", kstat_irqs(i));
#else
		for_each_online_cpu(j)
			seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
#endif
		seq_printf(p, " %14s", irq_desc[i].handler->typename);
		seq_printf(p, "  %s", action->name);

		for (action=action->next; action; action = action->next)
			seq_printf(p, ", %s", action->name);

		seq_putc(p, '\n');
skip:
		spin_unlock_irqrestore(&irq_desc[i].lock, flags);
	} else if (i == NR_IRQS) {
		seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
		seq_printf(p, "MIS: %10u\n", atomic_read(&irq_mis_count));
	}
	return 0;
}

/*
 * do_IRQ handles all normal device IRQ's (the special
 * SMP cross-CPU interrupts have their own specific
 * handlers).
 */
asmlinkage unsigned int do_IRQ(int irq, struct pt_regs *regs)
{
	irq_enter();

#ifdef CONFIG_DEBUG_STACKOVERFLOW
	/* FIXME M32R */
#endif
	__do_IRQ(irq, regs);
	irq_exit();

	return 1;
}