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

28 static 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 */