tests/kernel/test-hpet.c

   1 /* test-async-tsc.c
   2  *
   3  * test async tsc on AMD.
   4  */
   5
   6
   7 #include <asm/atomic.h>
   8 #include <linux/module.h>
   9 #include <asm/timex.h>
  10 #include <asm/hpet.h>
  11 #include <asm/io.h>
  12
  13 static int __init test_init(void)
  14 {
  15         int i;
  16         cycles_t time1, time2;
  17         volatile unsigned long myval;
  18
  19         time1 = get_cycles();
  20         for (i=0; i<1; i++) {
  21                 //printk("time %llu\n", ltt_tsc_read());
  22                 //myval = ltt_tsc_read();
  23                 myval = hpet_readl(HPET_COUNTER);
  24         }
  25         time2 = get_cycles();
  26         printk("timediff %llu\n", time2-time1);
  27         return -EPERM;
  28 }
  29
  30 static void __exit test_exit(void)
  31 {
  32 }
  33
  34 module_init(test_init);
  35 module_exit(test_exit);
  36
  37 MODULE_LICENSE("GPL");
  38 MODULE_AUTHOR("Mathieu Desnoyers");
  39 MODULE_DESCRIPTION("sync async tsc");
  40