/* Check __ppc_get_timebase_freq() for architecture changes

   Copyright (C) 2012-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

/* Test if __ppc_get_timebase_freq() works and is different from zero.  A read

   failure might indicate a Linux Kernel change.

   This test also use the frequency to compute the real elapsed time.  */

#include <inttypes.h>

#include <stdio.h>

#include <stdint.h>

#include <sys/platform/ppc.h>

/* Maximum value of the Time Base Register: 2^60 - 1.  */

#define MAX_TB 0xFFFFFFFFFFFFFFF

static int

do_test (void)

{

  uint64_t t1, t2, f, diff;

  t1 = __ppc_get_timebase ();

  printf ("t1 = %"PRIu64"\n", t1);

  f = __ppc_get_timebase_freq ();

  printf ("Time Base frequency = %"PRIu64" Hz\n", f);

  if (f == 0) {

      printf ("Fail: The time base frequency can't be zero.\n");

      return 1;

  }

  t2 = __ppc_get_timebase ();

  printf ("t2 = %"PRIu64"\n", t2);

  if (t2 > t1) {

    diff = t2 - t1;

  } else {

    diff = (MAX_TB - t2) + t1;

  }

  printf ("Elapsed time  = %1.2f usecs\n", (double) diff * 1000000 / f );

  return 0;

}

#define TEST_FUNCTION do_test ()

#include "../test-skeleton.c"