71 lines
2.5 KiB
C
71 lines
2.5 KiB
C
/*
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* Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
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* The President and Fellows of Harvard College.
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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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* 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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Machine-independent generic clock "device".
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*
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* Basically, all we do is remember something that can be used for
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* handling requests for the current time, and provide the gettime()
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* function to the rest of the kernel.
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*
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* The kernel config mechanism can be used to explicitly choose which
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* of the available clocks to use, if more than one is available.
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*
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* The system will panic if gettime() is called and there is no clock.
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*/
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#include <types.h>
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#include <kern/errno.h>
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#include <lib.h>
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#include <clock.h>
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#include <generic/rtclock.h>
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#include "autoconf.h"
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static struct rtclock_softc *the_clock = NULL;
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int
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config_rtclock(struct rtclock_softc *rtc, int unit)
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{
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/* We use only the first clock device. */
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if (unit!=0) {
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return ENODEV;
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}
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KASSERT(the_clock==NULL);
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the_clock = rtc;
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return 0;
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}
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void
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gettime(struct timespec *ts)
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{
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KASSERT(the_clock!=NULL);
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the_clock->rtc_gettime(the_clock->rtc_devdata, ts);
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}
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