40 lines
1.1 KiB
C
40 lines
1.1 KiB
C
#ifndef _I386_DELAY_H
|
|
#define _I386_DELAY_H
|
|
|
|
/*
|
|
* Copyright (C) 1993 Linus Torvalds
|
|
*
|
|
* Delay routines calling functions in arch/i386/lib/delay.c
|
|
*/
|
|
|
|
/* Undefined functions to get compile-time errors */
|
|
extern void __bad_udelay(void);
|
|
extern void __bad_ndelay(void);
|
|
|
|
extern void __udelay(unsigned long usecs);
|
|
extern void __ndelay(unsigned long nsecs);
|
|
extern void __const_udelay(unsigned long usecs);
|
|
extern void __delay(unsigned long loops);
|
|
|
|
#if defined(CONFIG_PARAVIRT) && !defined(USE_REAL_TIME_DELAY)
|
|
#define udelay(n) paravirt_ops.const_udelay((n) * 0x10c7ul)
|
|
|
|
#define ndelay(n) paravirt_ops.const_udelay((n) * 5ul)
|
|
|
|
#else /* !PARAVIRT || USE_REAL_TIME_DELAY */
|
|
|
|
/* 0x10c7 is 2**32 / 1000000 (rounded up) */
|
|
#define udelay(n) (__builtin_constant_p(n) ? \
|
|
((n) > 20000 ? __bad_udelay() : __const_udelay((n) * 0x10c7ul)) : \
|
|
__udelay(n))
|
|
|
|
/* 0x5 is 2**32 / 1000000000 (rounded up) */
|
|
#define ndelay(n) (__builtin_constant_p(n) ? \
|
|
((n) > 20000 ? __bad_ndelay() : __const_udelay((n) * 5ul)) : \
|
|
__ndelay(n))
|
|
#endif
|
|
|
|
void use_tsc_delay(void);
|
|
|
|
#endif /* defined(_I386_DELAY_H) */
|