timer.h 1.3 KB

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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. #ifndef AVUTIL_PPC_TIMER_H
  21. #define AVUTIL_PPC_TIMER_H
  22. #include <stdint.h>
  23. #include "config.h"
  24. #define AV_READ_TIME read_time
  25. static inline uint64_t read_time(void)
  26. {
  27. uint32_t tbu, tbl, temp;
  28. /* from section 2.2.1 of the 32-bit PowerPC PEM */
  29. __asm__ volatile(
  30. "mftbu %2\n"
  31. "mftb %0\n"
  32. "mftbu %1\n"
  33. "cmpw %2,%1\n"
  34. "bne $-0x10\n"
  35. : "=r"(tbl), "=r"(tbu), "=r"(temp)
  36. :
  37. : "cc");
  38. return (((uint64_t)tbu)<<32) | (uint64_t)tbl;
  39. }
  40. #endif /* AVUTIL_PPC_TIMER_H */