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jiffies.h revision 1.3 
      1 /*	$NetBSD: jiffies.h,v 1.3 2014/07/16 20:56:25 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2013 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Taylor R. Campbell.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _LINUX_JIFFIES_H_
     33 #define _LINUX_JIFFIES_H_
     34 
     35 #include <sys/param.h>
     36 #include <sys/kernel.h>
     37 
     38 #define	jiffies	hardclock_ticks
     39 
     40 /* XXX Er, what?  */
     41 #define	MAX_JIFFY_OFFSET	((INT_MAX >> 1) - 1)
     42 
     43 static inline unsigned int
     44 msecs_to_jiffies(unsigned int msec)
     45 {
     46 	return mstohz(msec);
     47 }
     48 
     49 static inline unsigned int
     50 jiffies_to_msecs(unsigned int j)
     51 {
     52 	return hztoms(j);
     53 }
     54 
     55 static inline unsigned int
     56 usecs_to_jiffies(unsigned int usec)
     57 {
     58 	return mstohz((usec + (1000 / hz) - 1) / (1000 / hz));
     59 }
     60 
     61 static inline unsigned int
     62 timespec_to_jiffies(const struct timespec *ts)
     63 {
     64 	return tstohz(ts);
     65 }
     66 
     67 /* XXX long is the wrong type here times...  */
     68 
     69 #define	__linux_time_compare(A, OP, B)	(((long)(A) - (long)(B)) OP 0)
     70 
     71 static inline bool
     72 time_after(unsigned long a, unsigned long b)
     73 {
     74 	return __linux_time_compare(a, >, b);
     75 }
     76 
     77 static inline bool
     78 time_after_eq(unsigned long a, unsigned long b)
     79 {
     80 	return __linux_time_compare(a, >=, b);
     81 }
     82 
     83 static inline bool
     84 time_before(unsigned long a, unsigned long b)
     85 {
     86 	return __linux_time_compare(a, <, b);
     87 }
     88 
     89 static inline bool
     90 time_before_eq(unsigned long a, unsigned long b)
     91 {
     92 	return __linux_time_compare(a, <=, b);
     93 }
     94 
     95 #endif  /* _LINUX_JIFFIES_H_ */
     96