FreeBSD/Linux Kernel Cross Reference
sys/sys/timeet.h
1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2010-2013 Alexander Motin <mav@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer,
12 * without modification, immediately at the beginning of the file.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * $FreeBSD: releng/12.0/sys/sys/timeet.h 326256 2017-11-27 15:01:59Z pfg $
29 */
30
31 #ifndef _SYS_TIMEEC_H_
32 #define _SYS_TIMEEC_H_
33
34 #ifndef _KERNEL
35 #error "no user-serviceable parts inside"
36 #endif
37
38 #include <sys/lock.h>
39 #include <sys/mutex.h>
40 #include <sys/queue.h>
41 #include <sys/time.h>
42
43 /*
44 * `struct eventtimer' is the interface between the hardware which implements
45 * a event timer and the MI code which uses this to receive time events.
46 */
47
48 struct eventtimer;
49 typedef int et_start_t(struct eventtimer *et,
50 sbintime_t first, sbintime_t period);
51 typedef int et_stop_t(struct eventtimer *et);
52 typedef void et_event_cb_t(struct eventtimer *et, void *arg);
53 typedef int et_deregister_cb_t(struct eventtimer *et, void *arg);
54
55 struct eventtimer {
56 SLIST_ENTRY(eventtimer) et_all;
57 /* Pointer to the next event timer. */
58 const char *et_name;
59 /* Name of the event timer. */
60 int et_flags;
61 /* Set of capabilities flags: */
62 #define ET_FLAGS_PERIODIC 1
63 #define ET_FLAGS_ONESHOT 2
64 #define ET_FLAGS_PERCPU 4
65 #define ET_FLAGS_C3STOP 8
66 #define ET_FLAGS_POW2DIV 16
67 int et_quality;
68 /*
69 * Used to determine if this timecounter is better than
70 * another timecounter. Higher means better.
71 */
72 int et_active;
73 u_int64_t et_frequency;
74 /* Base frequency in Hz. */
75 sbintime_t et_min_period;
76 sbintime_t et_max_period;
77 et_start_t *et_start;
78 et_stop_t *et_stop;
79 et_event_cb_t *et_event_cb;
80 et_deregister_cb_t *et_deregister_cb;
81 void *et_arg;
82 void *et_priv;
83 struct sysctl_oid *et_sysctl;
84 /* Pointer to the event timer's private parts. */
85 };
86
87 extern struct mtx et_eventtimers_mtx;
88 #define ET_LOCK() mtx_lock(&et_eventtimers_mtx)
89 #define ET_UNLOCK() mtx_unlock(&et_eventtimers_mtx)
90
91 /* Driver API */
92 int et_register(struct eventtimer *et);
93 int et_deregister(struct eventtimer *et);
94 void et_change_frequency(struct eventtimer *et, uint64_t newfreq);
95 /* Consumer API */
96 struct eventtimer *et_find(const char *name, int check, int want);
97 int et_init(struct eventtimer *et, et_event_cb_t *event,
98 et_deregister_cb_t *deregister, void *arg);
99 int et_start(struct eventtimer *et, sbintime_t first, sbintime_t period);
100 int et_stop(struct eventtimer *et);
101 int et_ban(struct eventtimer *et);
102 int et_free(struct eventtimer *et);
103
104 #ifdef SYSCTL_DECL
105 SYSCTL_DECL(_kern_eventtimer);
106 #endif
107 #endif /* !_SYS_TIMETC_H_ */
108
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