5 * Copyright (C) 1993 Linus Torvalds
7 * Delay routines, using a pre-computed "loops_per_jiffy" value.
10 #include <linux/kernel.h>
12 extern unsigned long loops_per_jiffy
;
14 #include <asm/delay.h>
17 * Using udelay() for intervals greater than a few milliseconds can
18 * risk overflow for high loops_per_jiffy (high bogomips) machines. The
19 * mdelay() provides a wrapper to prevent this. For delays greater
20 * than MAX_UDELAY_MS milliseconds, the wrapper is used. Architecture
21 * specific values can be defined in asm-???/delay.h as an override.
22 * The 2nd mdelay() definition ensures GCC will optimize away the
23 * while loop for the common cases where n <= MAX_UDELAY_MS -- Paul G.
27 #define MAX_UDELAY_MS 5
32 (__builtin_constant_p(n) && (n)<=MAX_UDELAY_MS) ? udelay((n)*1000) : \
33 ({unsigned long __ms=(n); while (__ms--) udelay(1000);}))
37 static inline void ndelay(unsigned long x
)
39 udelay(DIV_ROUND_UP(x
, 1000));
41 #define ndelay(x) ndelay(x)
44 extern unsigned long lpj_fine
;
45 void calibrate_delay(void);
46 void msleep(unsigned int msecs
);
47 unsigned long msleep_interruptible(unsigned int msecs
);
49 static inline void ssleep(unsigned int seconds
)
51 msleep(seconds
* 1000);
54 #endif /* defined(_LINUX_DELAY_H) */
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