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1 | /* High precision, low overhead timing functions. AArch64 version. |
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2 | Copyright (C) 2021-2024 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 | #ifndef _HP_TIMING_H |
20 | #define _HP_TIMING_H 1 |
21 | |
22 | #include <time.h> |
23 | #include <stdint.h> |
24 | #include <hp-timing-common.h> |
25 | #include <libc-symbols.h> |
26 | |
27 | /* Don't use inline timer in ld.so. */ |
28 | #if IS_IN(rtld) |
29 | # define HP_TIMING_INLINE (0) |
30 | #else |
31 | # define HP_TIMING_INLINE (1) |
32 | #endif |
33 | |
34 | typedef uint64_t hp_timing_t; |
35 | |
36 | #define HP_TIMING_NOW(var) \ |
37 | __asm__ __volatile__ ("isb; mrs %0, cntvct_el0" : "=r" (var)) |
38 | |
39 | /* Compute elapsed time in nanoseconds. */ |
40 | #undef HP_TIMING_DIFF |
41 | #define HP_TIMING_DIFF(Diff, Start, End) \ |
42 | ({ hp_timing_t freq; \ |
43 | __asm__ __volatile__ ("mrs %0, cntfrq_el0" : "=r" (freq)); \ |
44 | (Diff) = (((End) - (Start)) * UINT64_C(1000000000 >> 6)) / (freq >> 6); \ |
45 | }) |
46 | |
47 | #endif /* hp-timing.h */ |
48 |
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