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  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 */
  49.