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/i386/lib/delay.c 8 */ 9 10extern void __bad_udelay(void); 11 12extern void __udelay(unsigned long usecs); 13extern void __const_udelay(unsigned long usecs); 14extern 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(_X8664_DELAY_H) */ 21