安装一个中断处理例程

#include <linux/module.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <asm/io.h>
#include <linux/interrupt.h>
#include <linux/fs.h>
#include <linux/kdev_t.h>
#include <linux/cdev.h>

irqreturn_t irq_handler(int irq, void *dev_id)
{
        printk(KERN_ALERT "received a interrupt.\n");

        return IRQ_HANDLED;
}

static int __init test_init(void)
{
        int ret;

        ret = request_irq(7, irq_handler, SA_INTERRUPT, "helloworld", NULL);
        if (ret < 0)
                goto err;

        outb(0x10, 0x37a);

        printk(KERN_ALERT "interrupt handler register success.\n");

        return 0;
err:
        return ret;
}

static void __exit test_exit(void)
{
        free_irq(2, NULL);
}

MODULE_LICENSE("GPL");

module_init(test_init);
module_exit(test_exit);