1 #ifndef _LINUX_DELAY_H 2 #define _LINUX_DELAY_H 3 4 /* 5 * Copyright (C) 1993 Linus Torvalds 6 * 7 * Delay routines, using a pre-computed "loops_per_jiffy" value. 8 */ 9 10 extern unsigned long loops_per_jiffy; 11 12 #include <asm/delay.h> 13 14 /* 15 * Using udelay() for intervals greater than a few milliseconds can 16 * risk overflow for high loops_per_jiffy (high bogomips) machines. The 17 * mdelay() provides a wrapper to prevent this. For delays greater 18 * than MAX_UDELAY_MS milliseconds, the wrapper is used. Architecture 19 * specific values can be defined in asm-???/delay.h as an override. 20 * The 2nd mdelay() definition ensures GCC will optimize away the 21 * while loop for the common cases where n <= MAX_UDELAY_MS -- Paul G. 22 */ 23 24 #ifndef MAX_UDELAY_MS 25 #define MAX_UDELAY_MS 5 26 #endif 27 28 #ifndef mdelay 29 #define mdelay(n) (\ 30 (__builtin_constant_p(n) && (n)<=MAX_UDELAY_MS) ? udelay((n)*1000) : \ 31 ({unsigned long __ms=(n); while (__ms--) udelay(1000);})) 32 #endif 33 34 #ifndef ndelay 35 #define ndelay(x) udelay(((x)+999)/1000) 36 #endif 37 38 void calibrate_delay(void); 39 void msleep(unsigned int msecs); 40 unsigned long msleep_interruptible(unsigned int msecs); 41 42 static inline void ssleep(unsigned int seconds) 43 { 44 msleep(seconds * 1000); 45 } 46 47 #endif /* defined(_LINUX_DELAY_H) */ 48
