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libavutil/arm/timer.h

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00001 /*
00002  * Copyright (c) 2009 Mans Rullgard <mans@mansr.com>
00003  *
00004  * This file is part of FFmpeg.
00005  *
00006  * FFmpeg is free software; you can redistribute it and/or
00007  * modify it under the terms of the GNU Lesser General Public
00008  * License as published by the Free Software Foundation; either
00009  * version 2.1 of the License, or (at your option) any later version.
00010  *
00011  * FFmpeg is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public
00017  * License along with FFmpeg; if not, write to the Free Software
00018  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00019  */
00020 
00021 #ifndef AVUTIL_ARM_TIMER_H
00022 #define AVUTIL_ARM_TIMER_H
00023 
00024 #include <stdint.h>
00025 #include "config.h"
00026 
00027 #if HAVE_INLINE_ASM && defined(__ARM_ARCH_7A__)
00028 
00029 #define AV_READ_TIME read_time
00030 
00031 static inline uint64_t read_time(void)
00032 {
00033     unsigned cc;
00034     __asm__ volatile ("mrc p15, 0, %0, c9, c13, 0" : "=r"(cc));
00035     return cc;
00036 }
00037 
00038 #endif /* HAVE_INLINE_ASM && __ARM_ARCH_7A__ */
00039 
00040 #endif /* AVUTIL_ARM_TIMER_H */

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