1/*
2 * Copyright (c) 2005 Luca Barbato <lu_zero@gentoo.org>
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_PPC_TIMER_H
22#define AVUTIL_PPC_TIMER_H
23
24#include <stdint.h>
25
26#define AV_READ_TIME read_time
27
28static inline uint64_t read_time(void)
29{
30    uint32_t tbu, tbl, temp;
31
32     /* from section 2.2.1 of the 32-bit PowerPC PEM */
33     __asm__ volatile(
34         "1:\n"
35         "mftbu  %2\n"
36         "mftb   %0\n"
37         "mftbu  %1\n"
38         "cmpw   %2,%1\n"
39         "bne    1b\n"
40     : "=r"(tbl), "=r"(tbu), "=r"(temp)
41     :
42     : "cc");
43
44     return (((uint64_t)tbu)<<32) | (uint64_t)tbl;
45}
46
47#endif /* AVUTIL_PPC_TIMER_H */
48