cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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dummy-irq.c (1397B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Dummy IRQ handler driver.
      4 *
      5 * This module only registers itself as a handler that is specified to it
      6 * by the 'irq' parameter.
      7 *
      8 * The sole purpose of this module is to help with debugging of systems on
      9 * which spurious IRQs would happen on disabled IRQ vector.
     10 *
     11 * Copyright (C) 2013 Jiri Kosina
     12 */
     13
     14#include <linux/module.h>
     15#include <linux/irq.h>
     16#include <linux/interrupt.h>
     17
     18static int irq = -1;
     19
     20static irqreturn_t dummy_interrupt(int irq, void *dev_id)
     21{
     22	static int count = 0;
     23
     24	if (count == 0) {
     25		printk(KERN_INFO "dummy-irq: interrupt occurred on IRQ %d\n",
     26				irq);
     27		count++;
     28	}
     29
     30	return IRQ_NONE;
     31}
     32
     33static int __init dummy_irq_init(void)
     34{
     35	if (irq < 0) {
     36		printk(KERN_ERR "dummy-irq: no IRQ given.  Use irq=N\n");
     37		return -EIO;
     38	}
     39	if (request_irq(irq, &dummy_interrupt, IRQF_SHARED, "dummy_irq", &irq)) {
     40		printk(KERN_ERR "dummy-irq: cannot register IRQ %d\n", irq);
     41		return -EIO;
     42	}
     43	printk(KERN_INFO "dummy-irq: registered for IRQ %d\n", irq);
     44	return 0;
     45}
     46
     47static void __exit dummy_irq_exit(void)
     48{
     49	printk(KERN_INFO "dummy-irq unloaded\n");
     50	free_irq(irq, &irq);
     51}
     52
     53module_init(dummy_irq_init);
     54module_exit(dummy_irq_exit);
     55
     56MODULE_LICENSE("GPL");
     57MODULE_AUTHOR("Jiri Kosina");
     58module_param_hw(irq, uint, irq, 0444);
     59MODULE_PARM_DESC(irq, "The IRQ to register for");
     60MODULE_DESCRIPTION("Dummy IRQ handler driver");