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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 */
  41.