include/asm-x86_64/delay.h

   1 #ifndef _X8664_DELAY_H
   2 #define _X8664_DELAY_H
   3
   4 /*
   5  * Copyright (C) 1993 Linus Torvalds
   6  *
   7  * Delay routines calling functions in arch/x86_64/lib/delay.c
   8  */
   9
  10 extern void __bad_udelay(void);
  11 extern void __bad_ndelay(void);
  12
  13 extern void __udelay(unsigned long usecs);
  14 extern void __ndelay(unsigned long usecs);
  15 extern void __const_udelay(unsigned long usecs);
  16 extern void __delay(unsigned long loops);
  17
  18 #define udelay(n) (__builtin_constant_p(n) ? \
  19         ((n) > 20000 ? __bad_udelay() : __const_udelay((n) * 0x10c6ul)) : \
  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
  27 #endif /* defined(_X8664_DELAY_H) */