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51636352b6
lengths. Make MI wrapper code to validate periods in request. Make kernel clock management code to honor these hardware limitations while choosing hz, stathz and profhz values.
106 lines
3.6 KiB
C
106 lines
3.6 KiB
C
/*-
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* Copyright (c) 2010 Alexander Motin <mav@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer,
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* without modification, immediately at the beginning of the file.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _SYS_TIMEEC_H_
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#define _SYS_TIMEEC_H_
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#ifndef _KERNEL
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#error "no user-serviceable parts inside"
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#endif
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/queue.h>
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#include <sys/time.h>
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/*
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* `struct eventtimer' is the interface between the hardware which implements
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* a event timer and the MI code which uses this to receive time events.
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*/
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struct eventtimer;
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typedef int et_start_t(struct eventtimer *et,
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struct bintime *first, struct bintime *period);
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typedef int et_stop_t(struct eventtimer *et);
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typedef void et_event_cb_t(struct eventtimer *et, void *arg);
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typedef int et_deregister_cb_t(struct eventtimer *et, void *arg);
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struct eventtimer {
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SLIST_ENTRY(eventtimer) et_all;
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/* Pointer to the next event timer. */
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char *et_name;
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/* Name of the event timer. */
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int et_flags;
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/* Set of capabilities flags: */
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#define ET_FLAGS_PERIODIC 1
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#define ET_FLAGS_ONESHOT 2
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#define ET_FLAGS_PERCPU 4
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#define ET_FLAGS_C3STOP 8
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#define ET_FLAGS_POW2DIV 16
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int et_quality;
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/*
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* Used to determine if this timecounter is better than
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* another timecounter. Higher means better.
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*/
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int et_active;
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u_int64_t et_frequency;
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/* Base frequency in Hz. */
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struct bintime et_min_period;
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struct bintime et_max_period;
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et_start_t *et_start;
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et_stop_t *et_stop;
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et_event_cb_t *et_event_cb;
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et_deregister_cb_t *et_deregister_cb;
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void *et_arg;
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void *et_priv;
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struct sysctl_oid *et_sysctl;
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/* Pointer to the event timer's private parts. */
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};
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extern struct mtx et_eventtimers_mtx;
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#define ET_LOCK() mtx_lock_spin(&et_eventtimers_mtx)
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#define ET_UNLOCK() mtx_unlock_spin(&et_eventtimers_mtx)
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/* Driver API */
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int et_register(struct eventtimer *et);
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int et_deregister(struct eventtimer *et);
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/* Consumer API */
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struct eventtimer *et_find(const char *name, int check, int want);
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int et_init(struct eventtimer *et, et_event_cb_t *event,
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et_deregister_cb_t *deregister, void *arg);
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int et_start(struct eventtimer *et,
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struct bintime *first, struct bintime *period);
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int et_stop(struct eventtimer *et);
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int et_ban(struct eventtimer *et);
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int et_free(struct eventtimer *et);
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#ifdef SYSCTL_DECL
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SYSCTL_DECL(_kern_eventtimer);
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#endif
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#endif /* !_SYS_TIMETC_H_ */
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