1 /* $NetBSD: jiffies.h,v 1.14 2022/03/18 23:32:49 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 #include <asm/param.h> /* HZ */
39
40 #include <linux/math64.h>
41
42 #define jiffies getticks()
43 #define jiffies_64 getticks() /* XXX */
44
45 /* XXX Er, what? */
46 #define MAX_JIFFY_OFFSET ((INT_MAX >> 1) - 1)
47
48 static inline uint64_t
get_jiffies_64(void)49 get_jiffies_64(void)
50 {
51
52 return (uint64_t)(unsigned)getticks();
53 }
54
55 static inline uint64_t
nsecs_to_jiffies64(uint64_t nsec)56 nsecs_to_jiffies64(uint64_t nsec)
57 {
58
59 /* XXX Arbitrary cutoff, should review the arithmetic. */
60 if (((1000000000 % hz) == 0) || (nsec >= 20000000000ul))
61 return (nsec/1000000000)*hz;
62 else
63 return (nsec*hz)/1000000000;
64 }
65
66 static inline uint32_t
nsecs_to_jiffies(uint64_t nsec)67 nsecs_to_jiffies(uint64_t nsec)
68 {
69
70 /* XXX Not sure what else to do but truncate... */
71 return (uint32_t)nsecs_to_jiffies64(nsec);
72 }
73
74 static inline unsigned int
msecs_to_jiffies(unsigned int msec)75 msecs_to_jiffies(unsigned int msec)
76 {
77 return mstohz(msec);
78 }
79
80 static inline unsigned int
jiffies_to_msecs(unsigned int j)81 jiffies_to_msecs(unsigned int j)
82 {
83 return hztoms(j);
84 }
85
86 static inline unsigned int
usecs_to_jiffies(unsigned int usec)87 usecs_to_jiffies(unsigned int usec)
88 {
89 const struct timeval tv = {
90 .tv_sec = usec / 1000000,
91 .tv_usec = usec % 1000000,
92 };
93
94 return tvtohz(&tv);
95 }
96
97 static inline unsigned int
jiffies_to_usecs(unsigned int j)98 jiffies_to_usecs(unsigned int j)
99 {
100
101 /* XXX Do better arithmetic. */
102 return (unsigned int)((unsigned long)j*1000000/hz);
103 }
104
105 static inline unsigned int
timespec_to_jiffies(const struct timespec * ts)106 timespec_to_jiffies(const struct timespec *ts)
107 {
108 return tstohz(ts);
109 }
110
111 /* XXX long is the wrong type here times... */
112
113 #define __linux_time_compare(A, OP, B) (((long)(A) - (long)(B)) OP 0)
114
115 static inline bool
time_after(unsigned long a,unsigned long b)116 time_after(unsigned long a, unsigned long b)
117 {
118 return __linux_time_compare(a, >, b);
119 }
120
121 static inline bool
time_after_eq(unsigned long a,unsigned long b)122 time_after_eq(unsigned long a, unsigned long b)
123 {
124 return __linux_time_compare(a, >=, b);
125 }
126
127 static inline bool
time_before(unsigned long a,unsigned long b)128 time_before(unsigned long a, unsigned long b)
129 {
130 return __linux_time_compare(a, <, b);
131 }
132
133 static inline bool
time_before_eq(unsigned long a,unsigned long b)134 time_before_eq(unsigned long a, unsigned long b)
135 {
136 return __linux_time_compare(a, <=, b);
137 }
138
139 #endif /* _LINUX_JIFFIES_H_ */
140