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timer.h
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1 /*
2  * Copyright (c) 2009 Mans Rullgard <mans@mansr.com>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #ifndef AVUTIL_ARM_TIMER_H
22 #define AVUTIL_ARM_TIMER_H
23 
24 #include <stdint.h>
25 #include "config.h"
26 
27 #if HAVE_INLINE_ASM && defined(__ARM_ARCH_7A__)
28 
29 #define AV_READ_TIME read_time
30 
31 static inline uint64_t read_time(void)
32 {
33  unsigned cc;
34  __asm__ volatile ("mrc p15, 0, %0, c9, c13, 0" : "=r"(cc));
35  return cc;
36 }
37 
38 #endif /* HAVE_INLINE_ASM && __ARM_ARCH_7A__ */
39 
40 #endif /* AVUTIL_ARM_TIMER_H */