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64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
/* Check __ppc_get_timebase_freq() for architecture changes
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Copyright (C) 2012-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* Test if __ppc_get_timebase_freq() works and is different from zero. A read
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failure might indicate a Linux Kernel change.
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This test also use the frequency to compute the real elapsed time. */
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <sys/platform/ppc.h>
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/* Maximum value of the Time Base Register: 2^60 - 1. */
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#define MAX_TB 0xFFFFFFFFFFFFFFF
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static int
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do_test (void)
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{
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uint64_t t1, t2, f, diff;
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t1 = __ppc_get_timebase ();
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printf ("t1 = %"PRIu64"\n", t1);
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f = __ppc_get_timebase_freq ();
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printf ("Time Base frequency = %"PRIu64" Hz\n", f);
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if (f == 0) {
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printf ("Fail: The time base frequency can't be zero.\n");
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return 1;
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}
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t2 = __ppc_get_timebase ();
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printf ("t2 = %"PRIu64"\n", t2);
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if (t2 > t1) {
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diff = t2 - t1;
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} else {
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diff = (MAX_TB - t2) + t1;
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}
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printf ("Elapsed time = %1.2f usecs\n", (double) diff * 1000000 / f );
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return 0;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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