64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
/* Check __ppc_get_timebase_freq() for architecture changes
|
|
Copyright (C) 2012-2014 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.");
|
|
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"
|