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8ad11b9a | 1 | /* Check __ppc_get_timebase_freq() for architecture changes |
04277e02 | 2 | Copyright (C) 2012-2019 Free Software Foundation, Inc. |
8ad11b9a TMQMF |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | /* Test if __ppc_get_timebase_freq() works and is different from zero. A read | |
20 | failure might indicate a Linux Kernel change. | |
21 | This test also use the frequency to compute the real elapsed time. */ | |
22 | ||
23 | #include <inttypes.h> | |
24 | #include <stdio.h> | |
e054f494 | 25 | #include <stdint.h> |
8ad11b9a TMQMF |
26 | |
27 | #include <sys/platform/ppc.h> | |
28 | ||
29 | /* Maximum value of the Time Base Register: 2^60 - 1. */ | |
30 | #define MAX_TB 0xFFFFFFFFFFFFFFF | |
31 | ||
32 | static int | |
33 | do_test (void) | |
34 | { | |
35 | uint64_t t1, t2, f, diff; | |
36 | ||
37 | t1 = __ppc_get_timebase (); | |
38 | printf ("t1 = %"PRIu64"\n", t1); | |
39 | ||
40 | f = __ppc_get_timebase_freq (); | |
41 | printf ("Time Base frequency = %"PRIu64" Hz\n", f); | |
42 | ||
43 | if (f == 0) { | |
4a2552c3 | 44 | printf ("Fail: The time base frequency can't be zero.\n"); |
8ad11b9a TMQMF |
45 | return 1; |
46 | } | |
47 | ||
48 | t2 = __ppc_get_timebase (); | |
49 | printf ("t2 = %"PRIu64"\n", t2); | |
50 | ||
51 | if (t2 > t1) { | |
52 | diff = t2 - t1; | |
53 | } else { | |
54 | diff = (MAX_TB - t2) + t1; | |
55 | } | |
56 | ||
57 | printf ("Elapsed time = %1.2f usecs\n", (double) diff * 1000000 / f ); | |
58 | ||
59 | return 0; | |
60 | } | |
61 | ||
62 | #define TEST_FUNCTION do_test () | |
63 | #include "../test-skeleton.c" |