#ifndef _X8664_DELAY_H
  #define _X8664_DELAY_H
  
  /*
   * Copyright (C) 1993 Linus Torvalds
   *
   * Delay routines calling functions in arch/x86_64/lib/delay.c
   */
   

  /* Undefined functions to get compile-time errors */

  extern void __bad_udelay(void);
  extern void __bad_ndelay(void);
  
  extern void __udelay(unsigned long usecs);

  extern void __ndelay(unsigned long nsecs);

  extern void __const_udelay(unsigned long usecs);
  extern void __delay(unsigned long loops);

  /* 0x10c7 is 2**32 / 1000000 (rounded up) */

  #define udelay(n) (__builtin_constant_p(n) ? \

  	((n) > 20000 ? __bad_udelay() : __const_udelay((n) * 0x10c7ul)) : \

  	__udelay(n))

  /* 0x5 is 2**32 / 1000000000 (rounded up) */

  #define ndelay(n) (__builtin_constant_p(n) ? \
         ((n) > 20000 ? __bad_ndelay() : __const_udelay((n) * 5ul)) : \
         __ndelay(n))
  
  
  #endif /* defined(_X8664_DELAY_H) */