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H. Peter Anvin1965aae2008-10-22 22:26:29 -07001#ifndef _ASM_X86_DELAY_H
2#define _ASM_X86_DELAY_H
Thomas Gleixnerf1ea0542007-10-15 23:28:20 +02003
4/*
5 * Copyright (C) 1993 Linus Torvalds
6 *
7 * Delay routines calling functions in arch/x86/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);
Jeff Dike5ab24c72008-02-06 01:37:19 -080016extern void __const_udelay(unsigned long xloops);
Thomas Gleixnerf1ea0542007-10-15 23:28:20 +020017extern 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
29void use_tsc_delay(void);
30
H. Peter Anvin1965aae2008-10-22 22:26:29 -070031#endif /* _ASM_X86_DELAY_H */