| 1 | /* Check __ppc_get_timebase_freq() for architecture changes |
|---|
| 2 | Copyright (C) 2012-2022 Free Software Foundation, Inc. |
|---|
| 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 | <https://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> |
|---|
| 25 | #include <stdint.h> |
|---|
| 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 (format: "t1 = %" PRIu64"\n" , t1); |
|---|
| 39 | |
|---|
| 40 | f = __ppc_get_timebase_freq (); |
|---|
| 41 | printf (format: "Time Base frequency = %" PRIu64" Hz\n" , f); |
|---|
| 42 | |
|---|
| 43 | if (f == 0) { |
|---|
| 44 | printf (format: "Fail: The time base frequency can't be zero.\n" ); |
|---|
| 45 | return 1; |
|---|
| 46 | } |
|---|
| 47 | |
|---|
| 48 | t2 = __ppc_get_timebase (); |
|---|
| 49 | printf (format: "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 (format: "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" |
|---|
| 64 | |
|---|
