5 * Copyright (C) 1993 Linus Torvalds
7 * Delay routines, using a pre-computed "loops_per_jiffy" value.
10 extern unsigned long loops_per_jiffy;
12 #include <asm/delay.h>
13 #include <linux/hardirq.h>
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.
25 #define MAX_UDELAY_MS 5
31 static int warned=0; \
32 unsigned long __ms=(n); \
33 WARN_ON(in_irq() && !(warned++)); \
34 while (__ms--) udelay(1000); \
39 #define ndelay(x) udelay(((x)+999)/1000)
42 void calibrate_delay(void);
43 void msleep(unsigned int msecs);
44 unsigned long msleep_interruptible(unsigned int msecs);
46 static inline void ssleep(unsigned int seconds)
48 msleep(seconds * 1000);
51 #endif /* defined(_LINUX_DELAY_H) */