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/* Undefined functions to get compile-time errors */
11extern void __bad_udelay(void);
12extern void __bad_ndelay(void);
13
14extern void __udelay(unsigned long usecs);
15extern void __ndelay(unsigned long nsecs);
16extern void __const_udelay(unsigned long usecs);
17extern void __delay(unsigned long loops);
18
19/* 0x10c7 is 2**32 / 1000000 (rounded up) */
20#define udelay(n) (__builtin_constant_p(n) ? \
21	((n) > 20000 ? __bad_udelay() : __const_udelay((n) * 0x10c7ul)) : \
22	__udelay(n))
23
24/* 0x5 is 2**32 / 1000000000 (rounded up) */
25#define ndelay(n) (__builtin_constant_p(n) ? \
26       ((n) > 20000 ? __bad_ndelay() : __const_udelay((n) * 5ul)) : \
27       __ndelay(n))
28
29
30#endif /* defined(_X8664_DELAY_H) */
31