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 read_time(void)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