LXR linux-bk/include/asm-i386/delay.h

   1#ifndef _I386_DELAY_H
   2#define _I386_DELAY_H
   3
   4/*
   5 * Copyright (C) 1993 Linus Torvalds
   6 *
   7 * Delay routines calling functions in arch/i386/lib/delay.c
   8 */
   9 
  10extern void __bad_udelay(void);
  11extern void __bad_ndelay(void);
  12
  13extern void __udelay(unsigned long usecs);
  14extern void __ndelay(unsigned long nsecs);
  15extern void __const_udelay(unsigned long usecs);
  16extern void __delay(unsigned long loops);
  17
  18#define udelay(n) (__builtin_constant_p(n) ? \
  19        ((n) > 20000 ? __bad_udelay() : __const_udelay((n) * 0x10c7ul)) : \
  20        __udelay(n))
  21        
  22#define ndelay(n) (__builtin_constant_p(n) ? \
  23        ((n) > 20000 ? __bad_ndelay() : __const_udelay((n) * 5ul)) : \
  24        __ndelay(n))
  25
  26#endif /* defined(_I386_DELAY_H) */
  27