2 * This file is part of FFmpeg.
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 #ifndef AVUTIL_RISCV_TIMER_H
20 #define AVUTIL_RISCV_TIMER_H
27 static inline uint64_t ff_read_time(void)
29 #if (__riscv_xlen >= 64)
32 __asm__ volatile ("rdtime %0" : "=r" (cycles));
36 uint32_t hi, lo, check;
42 " bne %0, %2, 1b\n" : "=r" (hi), "=r" (lo), "=r" (check));
44 cycles = (((uint64_t)hi) << 32) | lo;
50 #define AV_READ_TIME ff_read_time
51 #define FF_TIMER_UNITS "ticks"
54 #endif /* AVUTIL_RISCV_TIMER_H */