arch/ppc-chrp/efika/timer/readeclock.c

   1 /*
   2     Copyright © 1995-2007, 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 /*****************************************************************************
  10
  11     NAME */
  12 #include <devices/timer.h>
  13 #include <proto/timer.h>
  14 #include <proto/exec.h>
  15
  16 #include <asm/mpc5200b.h>
  17
  18 #include "lowlevel.h"
  19
  20         AROS_LH1(ULONG, ReadEClock,
  21
  22 /*  SYNOPSIS */
  23         AROS_LHA(struct EClockVal *, dest, A0),
  24
  25 /*  LOCATION */
  26         struct TimerBase *, TimerBase, 10, Timer)
  27
  28 /*  FUNCTION
  29         ReadEClock() reads current value of E-Clock and stores
  30         it in the destination EClockVal structure passed as
  31         argument. It also returns the frequency of EClock of the
  32         system.
  33
  34         This call is supposed to be very fast.
  35     INPUTS
  36         dest    -   Destination EClockVal
  37
  38     RESULT
  39         The EClock frequency (tics/s)
  40
  41     NOTES
  42         This function is safe to call from interrupts.
  43
  44     EXAMPLE
  45
  46     BUGS
  47
  48     SEE ALSO
  49
  50     INTERNALS
  51
  52     HISTORY
  53         19-08-2005  schulz   Implemented.
  54
  55 *****************************************************************************/
  56 {
  57     AROS_LIBFUNC_INIT
  58
  59     Disable();
  60
  61     EClockUpdate(TimerBase);
  62
  63     dest->ev_hi = TimerBase->tb_ticks_total >> 32;
  64     dest->ev_lo = TimerBase->tb_ticks_total & 0xffffffff;
  65
  66     Enable();
  67     return 33000000;
  68
  69     AROS_LIBFUNC_EXIT
  70 } /* CmpTime */
  71