delay.h
上传用户:lgb322
上传日期:2013-02-24
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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
- */
-
- extern void __bad_udelay(void);
- extern void __udelay(unsigned long usecs);
- extern void __const_udelay(unsigned long usecs);
- extern void __delay(unsigned long loops);
- #define udelay(n) (__builtin_constant_p(n) ?
- ((n) > 20000 ? __bad_udelay() : __const_udelay((n) * 0x10c6ul)) :
- __udelay(n))
- #endif /* defined(_I386_DELAY_H) */