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
  10 extern void __bad_udelay(void);
  11
  12 extern void __udelay(unsigned long usecs);
  13 extern void __const_udelay(unsigned long usecs);
  14 extern void __delay(unsigned long loops);
  15
  16 #define udelay(n) (__builtin_constant_p(n) ? \
  17         ((n) > 20000 ? __bad_udelay() : __const_udelay((n) * 0x10c6ul)) : \
  18         __udelay(n))
  19
  20 #endif /* defined(_I386_DELAY_H) */