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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pps-ktimer.c (1746B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * pps-ktimer.c -- kernel timer test client
      4 *
      5 * Copyright (C) 2005-2006   Rodolfo Giometti <giometti@linux.it>
      6 */
      7
      8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
      9
     10#include <linux/kernel.h>
     11#include <linux/module.h>
     12#include <linux/init.h>
     13#include <linux/time.h>
     14#include <linux/timer.h>
     15#include <linux/pps_kernel.h>
     16
     17/*
     18 * Global variables
     19 */
     20
     21static struct pps_device *pps;
     22static struct timer_list ktimer;
     23
     24/*
     25 * The kernel timer
     26 */
     27
     28static void pps_ktimer_event(struct timer_list *unused)
     29{
     30	struct pps_event_time ts;
     31
     32	/* First of all we get the time stamp... */
     33	pps_get_ts(&ts);
     34
     35	pps_event(pps, &ts, PPS_CAPTUREASSERT, NULL);
     36
     37	mod_timer(&ktimer, jiffies + HZ);
     38}
     39
     40/*
     41 * The PPS info struct
     42 */
     43
     44static struct pps_source_info pps_ktimer_info = {
     45	.name		= "ktimer",
     46	.path		= "",
     47	.mode		= PPS_CAPTUREASSERT | PPS_OFFSETASSERT |
     48			  PPS_ECHOASSERT |
     49			  PPS_CANWAIT | PPS_TSFMT_TSPEC,
     50	.owner		= THIS_MODULE,
     51};
     52
     53/*
     54 * Module staff
     55 */
     56
     57static void __exit pps_ktimer_exit(void)
     58{
     59	dev_info(pps->dev, "ktimer PPS source unregistered\n");
     60
     61	del_timer_sync(&ktimer);
     62	pps_unregister_source(pps);
     63}
     64
     65static int __init pps_ktimer_init(void)
     66{
     67	pps = pps_register_source(&pps_ktimer_info,
     68				PPS_CAPTUREASSERT | PPS_OFFSETASSERT);
     69	if (IS_ERR(pps)) {
     70		pr_err("cannot register PPS source\n");
     71		return PTR_ERR(pps);
     72	}
     73
     74	timer_setup(&ktimer, pps_ktimer_event, 0);
     75	mod_timer(&ktimer, jiffies + HZ);
     76
     77	dev_info(pps->dev, "ktimer PPS source registered\n");
     78
     79	return 0;
     80}
     81
     82module_init(pps_ktimer_init);
     83module_exit(pps_ktimer_exit);
     84
     85MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
     86MODULE_DESCRIPTION("dummy PPS source by using a kernel timer (just for debug)");
     87MODULE_LICENSE("GPL");