arch/m68k-amiga/timer/readeclock.c

   1 /*
   2     Copyright © 1995-2013, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: ReadEClock() - read the base frequency of timers.
   6     Lang: english
   7 */
   8
   9 #include <devices/timer.h>
  10 #include <proto/timer.h>
  11 #include <proto/exec.h>
  12
  13 #include <timer_intern.h>
  14
  15 /* See rom/timer/readeclock.c for documentation */
  16
  17 AROS_LH1(ULONG, ReadEClock,
  18     AROS_LHA(struct EClockVal *, dest, A0),
  19     struct TimerBase *, TimerBase, 10, Timer)
  20 {
  21     AROS_LIBFUNC_INIT
  22
  23     ULONG eclock, old;
  24
  25     Disable();
  26     old = dest->ev_lo = TimerBase->tb_eclock.ev_lo;
  27     dest->ev_hi = TimerBase->tb_eclock.ev_hi;
  28     eclock = GetEClock(TimerBase);
  29     Enable();
  30     dest->ev_lo += eclock;
  31     if (old > dest->ev_lo)
  32         dest->ev_hi++;
  33     return TimerBase->tb_eclock_rate;
  34
  35     AROS_LIBFUNC_EXIT
  36 } /* CmpTime */
  37