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libavutil/ppc/timer.h

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00001 /*
00002  * Copyright (c) 2005 Luca Barbato <lu_zero@gentoo.org>
00003  *
00004  * This file is part of FFmpeg.
00005  *
00006  * FFmpeg is free software; you can redistribute it and/or
00007  * modify it under the terms of the GNU Lesser General Public
00008  * License as published by the Free Software Foundation; either
00009  * version 2.1 of the License, or (at your option) any later version.
00010  *
00011  * FFmpeg is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public
00017  * License along with FFmpeg; if not, write to the Free Software
00018  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00019  */
00020 
00021 #ifndef AVUTIL_PPC_TIMER_H
00022 #define AVUTIL_PPC_TIMER_H
00023 
00024 #include <stdint.h>
00025 
00026 #define AV_READ_TIME read_time
00027 
00028 static inline uint64_t read_time(void)
00029 {
00030     uint32_t tbu, tbl, temp;
00031 
00032      /* from section 2.2.1 of the 32-bit PowerPC PEM */
00033      __asm__ volatile(
00034          "1:\n"
00035          "mftbu  %2\n"
00036          "mftb   %0\n"
00037          "mftbu  %1\n"
00038          "cmpw   %2,%1\n"
00039          "bne    1b\n"
00040      : "=r"(tbl), "=r"(tbu), "=r"(temp)
00041      :
00042      : "cc");
00043 
00044      return (((uint64_t)tbu)<<32) | (uint64_t)tbl;
00045 }
00046 
00047 #endif /* AVUTIL_PPC_TIMER_H */

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