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jiffies.h revision 1.8 
      1 /*	$NetBSD: jiffies.h,v 1.8 2018/08/27 06:18:41 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 uint64_t
     45 nsecs_to_jiffies64(uint64_t nsec)
     46 {
     47 
     48 	/* XXX Arbitrary cutoff, should review the arithmetic.  */
     49 	if (((1000000000 % hz) == 0) || (ns >= 20000000000ul))
     50 		return (nsec/1000000000)*hz;
     51 	else
     52 		return (nsec*hz)/1000000000;
     53 }
     54 
     55 static inline unsigned int
     56 msecs_to_jiffies(unsigned int msec)
     57 {
     58 	return mstohz(msec);
     59 }
     60 
     61 static inline unsigned int
     62 jiffies_to_msecs(unsigned int j)
     63 {
     64 	return hztoms(j);
     65 }
     66 
     67 static inline unsigned int
     68 usecs_to_jiffies(unsigned int usec)
     69 {
     70 	const struct timeval tv = {
     71 		.tv_sec = usec / 1000000,
     72 		.tv_usec = usec % 1000000,
     73 	};
     74 
     75 	return tvtohz(&tv);
     76 }
     77 
     78 static inline unsigned int
     79 timespec_to_jiffies(const struct timespec *ts)
     80 {
     81 	return tstohz(ts);
     82 }
     83 
     84 /* XXX long is the wrong type here times...  */
     85 
     86 #define	__linux_time_compare(A, OP, B)	(((long)(A) - (long)(B)) OP 0)
     87 
     88 static inline bool
     89 time_after(unsigned long a, unsigned long b)
     90 {
     91 	return __linux_time_compare(a, >, b);
     92 }
     93 
     94 static inline bool
     95 time_after_eq(unsigned long a, unsigned long b)
     96 {
     97 	return __linux_time_compare(a, >=, b);
     98 }
     99 
    100 static inline bool
    101 time_before(unsigned long a, unsigned long b)
    102 {
    103 	return __linux_time_compare(a, <, b);
    104 }
    105 
    106 static inline bool
    107 time_before_eq(unsigned long a, unsigned long b)
    108 {
    109 	return __linux_time_compare(a, <=, b);
    110 }
    111 
    112 #endif  /* _LINUX_JIFFIES_H_ */
    113