arch/ppc-chrp/efika/timer/lowlevel.h

   1 /*
   2     Copyright © 2008-2014, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 #ifndef LOWLEVEL_H_
   7 #define LOWLEVEL_H_
   8
   9 #include <inttypes.h>
  10 #include "timer_intern.h"
  11
  12 #define TIMEBASE_FREQUENCY 33000000
  13
  14 extern uint32_t tbc_expected;
  15 extern uint32_t tbc_achieved;
  16 extern int32_t corr;
  17
  18 void EClockUpdate(struct TimerBase *TimerBase);
  19 void EClockSet(struct TimerBase *TimerBase);
  20 void TimerSetup(struct TimerBase *TimerBase, uint32_t waste);
  21
  22 static volatile uint32_t mftbl()
  23 {
  24         uint32_t tb;
  25
  26         asm volatile("mftb %0":"=r"(tb));
  27
  28         return tb;
  29 }
  30
  31 static inline uint64_t mftb()
  32 {
  33         uint32_t lo,hi,tmp;
  34
  35         do {
  36                 asm volatile("mftbu %0; mftb %1; mftbu %2":"=r"(hi),"=r"(lo),"=r"(tmp));
  37         } while(tmp != hi);
  38
  39         return (((uint64_t)hi) << 32) | ((uint64_t)lo);
  40 }
  41
  42 #endif /* LOWLEVEL_H_ */