| /* 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" |
