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- #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) */
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