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jiffies.h revision 1.4 
      1 /*	$NetBSD: jiffies.h,v 1.4 2014/07/16 20:59:58 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 #define	jiffies_64	hardclock_ticks /* XXX */
     40 
     41 /* XXX Er, what?  */
     42 #define	MAX_JIFFY_OFFSET	((INT_MAX >> 1) - 1)
     43 
     44 static inline unsigned int
     45 msecs_to_jiffies(unsigned int msec)
     46 {
     47 	return mstohz(msec);
     48 }
     49 
     50 static inline unsigned int
     51 jiffies_to_msecs(unsigned int j)
     52 {
     53 	return hztoms(j);
     54 }
     55 
     56 static inline unsigned int
     57 usecs_to_jiffies(unsigned int usec)
     58 {
     59 	return mstohz((usec + (1000 / hz) - 1) / (1000 / hz));
     60 }
     61 
     62 static inline unsigned int
     63 timespec_to_jiffies(const struct timespec *ts)
     64 {
     65 	return tstohz(ts);
     66 }
     67 
     68 /* XXX long is the wrong type here times...  */
     69 
     70 #define	__linux_time_compare(A, OP, B)	(((long)(A) - (long)(B)) OP 0)
     71 
     72 static inline bool
     73 time_after(unsigned long a, unsigned long b)
     74 {
     75 	return __linux_time_compare(a, >, b);
     76 }
     77 
     78 static inline bool
     79 time_after_eq(unsigned long a, unsigned long b)
     80 {
     81 	return __linux_time_compare(a, >=, b);
     82 }
     83 
     84 static inline bool
     85 time_before(unsigned long a, unsigned long b)
     86 {
     87 	return __linux_time_compare(a, <, b);
     88 }
     89 
     90 static inline bool
     91 time_before_eq(unsigned long a, unsigned long b)
     92 {
     93 	return __linux_time_compare(a, <=, b);
     94 }
     95 
     96 #endif  /* _LINUX_JIFFIES_H_ */
     97