From 9fd51e9b0ad33a89a83fdbbb66bd20d85f7893fb Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Fri, 4 Feb 2000 03:21:18 +0000 Subject: Import of Linux 2.2.12 subset (ipv4 stack and related) --- pfinet/linux-src/include/linux/delay.h | 37 ++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 pfinet/linux-src/include/linux/delay.h (limited to 'pfinet/linux-src/include/linux/delay.h') diff --git a/pfinet/linux-src/include/linux/delay.h b/pfinet/linux-src/include/linux/delay.h new file mode 100644 index 00000000..e1cf03d6 --- /dev/null +++ b/pfinet/linux-src/include/linux/delay.h @@ -0,0 +1,37 @@ +#ifndef _LINUX_DELAY_H +#define _LINUX_DELAY_H + +/* + * Copyright (C) 1993 Linus Torvalds + * + * Delay routines, using a pre-computed "loops_per_second" value. + */ + +extern unsigned long loops_per_sec; + +#include + +/* + * Using udelay() for intervals greater than a few milliseconds can + * risk overflow for high loops_per_sec (high bogomips) machines. The + * mdelay() provides a wrapper to prevent this. For delays greater + * than MAX_UDELAY_MS milliseconds, the wrapper is used. Architecture + * specific values can be defined in asm-???/delay.h as an override. + * The 2nd mdelay() definition ensures GCC will optimize away the + * while loop for the common cases where n <= MAX_UDELAY_MS -- Paul G. + */ + +#ifndef MAX_UDELAY_MS +#define MAX_UDELAY_MS 5 +#endif + +#ifdef notdef +#define mdelay(n) (\ + {unsigned long msec=(n); while (msec--) udelay(1000);}) +#else +#define mdelay(n) (\ + (__builtin_constant_p(n) && (n)<=MAX_UDELAY_MS) ? udelay((n)*1000) : \ + ({unsigned long msec=(n); while (msec--) udelay(1000);})) +#endif + +#endif /* defined(_LINUX_DELAY_H) */ -- cgit v1.2.3