1/*
2 * Copyright (c) 2015 Janne Grunau <janne-libav@jannau.net>
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_AARCH64_TIMER_H
22#define AVUTIL_AARCH64_TIMER_H
23
24#include <stdint.h>
25#include "config.h"
26
27#if defined(__APPLE__)
28
29#include <mach/mach_time.h>
30
31#define AV_READ_TIME mach_absolute_time
32
33#elif HAVE_INLINE_ASM
34
35#define AV_READ_TIME read_time
36
37static inline uint64_t read_time(void)
38{
39    uint64_t cycle_counter;
40    __asm__ volatile(
41        "isb                   \t\n"
42        "mrs %0, pmccntr_el0       "
43        : "=r"(cycle_counter) :: "memory" );
44
45    return cycle_counter;
46}
47
48#endif /* HAVE_INLINE_ASM */
49
50#endif /* AVUTIL_AARCH64_TIMER_H */
51