timex.h 1.4 KB

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  1. /* SPDX-License-Identifier: GPL-2.0 */
  2. #ifndef _ASM_IA64_TIMEX_H
  3. #define _ASM_IA64_TIMEX_H
  4. /*
  5. * Copyright (C) 1998-2001, 2003 Hewlett-Packard Co
  6. * David Mosberger-Tang <davidm@hpl.hp.com>
  7. */
  8. /*
  9. * 2001/01/18 davidm Removed CLOCK_TICK_RATE. It makes no sense on IA-64.
  10. * Also removed cacheflush_time as it's entirely unused.
  11. */
  12. #include <asm/intrinsics.h>
  13. #include <asm/processor.h>
  14. typedef unsigned long cycles_t;
  15. extern void (*ia64_udelay)(unsigned long usecs);
  16. /*
  17. * For performance reasons, we don't want to define CLOCK_TICK_TRATE as
  18. * local_cpu_data->itc_rate. Fortunately, we don't have to, either: according to George
  19. * Anzinger, 1/CLOCK_TICK_RATE is taken as the resolution of the timer clock. The time
  20. * calculation assumes that you will use enough of these so that your tick size <= 1/HZ.
  21. * If the calculation shows that your CLOCK_TICK_RATE can not supply exactly 1/HZ ticks,
  22. * the actual value is calculated and used to update the wall clock each jiffie. Setting
  23. * the CLOCK_TICK_RATE to x*HZ insures that the calculation will find no errors. Hence we
  24. * pick a multiple of HZ which gives us a (totally virtual) CLOCK_TICK_RATE of about
  25. * 100MHz.
  26. */
  27. #define CLOCK_TICK_RATE (HZ * 100000UL)
  28. static inline cycles_t
  29. get_cycles (void)
  30. {
  31. cycles_t ret;
  32. ret = ia64_getreg(_IA64_REG_AR_ITC);
  33. return ret;
  34. }
  35. extern void ia64_cpu_local_tick (void);
  36. extern unsigned long long ia64_native_sched_clock (void);
  37. #endif /* _ASM_IA64_TIMEX_H */