LXR linux-old/include/asm-mips/timex.h

   1/*
   2 * This file is subject to the terms and conditions of the GNU General Public
   3 * License.  See the file "COPYING" in the main directory of this archive
   4 * for more details.
   5 *
   6 * Copyright (C) 1998, 1999, 2003 by Ralf Baechle
   7 *
   8 * FIXME: For some of the supported machines this is dead wrong.
   9 */
  10#ifndef _ASM_TIMEX_H
  11#define _ASM_TIMEX_H
  12
  13#include <asm/mipsregs.h>
  14
  15/*
  16 * Standard way to access the cycle counter.
  17 * Currently only used on SMP for scheduling.
  18 *
  19 * Only the low 32 bits are available as a continuously counting entity.
  20 * But this only means we'll force a reschedule every 8 seconds or so,
  21 * which isn't an evil thing.
  22 *
  23 * We know that all SMP capable CPUs have cycle counters.
  24 */
  25
  26typedef unsigned int cycles_t;
  27extern cycles_t cacheflush_time;
  28
  29static inline cycles_t get_cycles (void)
  30{
  31        return read_c0_count();
  32}
  33
  34#define vxtime_lock()           do {} while (0)
  35#define vxtime_unlock()         do {} while (0)
  36
  37#endif /*  _ASM_TIMEX_H */
  38