FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
timer.h
Go to the documentation of this file.
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 #include "config.h"
27 
28 #define AV_READ_TIME read_time
29 
30 static inline uint64_t read_time(void)
31 {
32  uint32_t tbu, tbl, temp;
33 
34  /* from section 2.2.1 of the 32-bit PowerPC PEM */
35  __asm__ volatile(
36  "mftbu %2\n"
37  "mftb %0\n"
38  "mftbu %1\n"
39  "cmpw %2,%1\n"
40  "bne $-0x10\n"
41  : "=r"(tbl), "=r"(tbu), "=r"(temp)
42  :
43  : "cc");
44 
45  return (((uint64_t)tbu)<<32) | (uint64_t)tbl;
46 }
47 
48 #endif /* AVUTIL_PPC_TIMER_H */