LXR linux/arch/c6x/include/asm/timex.h

   1/*
   2 *  Port on Texas Instruments TMS320C6x architecture
   3 *
   4 *  Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
   5 *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
   6 *
   7 *  Modified for 2.6.34: Mark Salter <msalter@redhat.com>
   8 *
   9 *  This program is free software; you can redistribute it and/or modify
  10 *  it under the terms of the GNU General Public License version 2 as
  11 *  published by the Free Software Foundation.
  12 */
  13#ifndef _ASM_C6X_TIMEX_H
  14#define _ASM_C6X_TIMEX_H
  15
  16#define CLOCK_TICK_RATE ((1000 * 1000000UL) / 6)
  17
  18/* 64-bit timestamp */
  19typedef unsigned long long cycles_t;
  20
  21static inline cycles_t get_cycles(void)
  22{
  23        unsigned l, h;
  24
  25        asm volatile (" dint\n"
  26                      " mvc .s2 TSCL,%0\n"
  27                      " mvc .s2 TSCH,%1\n"
  28                      " rint\n"
  29                      : "=b"(l), "=b"(h));
  30        return ((cycles_t)h << 32) | l;
  31}
  32
  33#endif /* _ASM_C6X_TIMEX_H */
  34