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clock.c revision 1.1 
      1 /* $NetBSD: clock.c,v 1.1 2007/12/29 14:38:31 jmcneill Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2007 Jared D. McNeill <jmcneill (at) invisible.ca>
      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  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *        This product includes software developed by Jared D. McNeill.
     18  * 4. Neither the name of The NetBSD Foundation nor the names of its
     19  *    contributors may be used to endorse or promote products derived
     20  *    from this software without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     24  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     25  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     26  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     32  * POSSIBILITY OF SUCH DAMAGE.
     33  */
     34 
     35 #include <sys/cdefs.h>
     36 __KERNEL_RCSID(0, "$NetBSD: clock.c,v 1.1 2007/12/29 14:38:31 jmcneill Exp $");
     37 
     38 #include <sys/param.h>
     39 #include <sys/proc.h>
     40 #include <sys/user.h>
     41 #include <sys/systm.h>
     42 #include <sys/device.h>
     43 
     44 #include <machine/mainbus.h>
     45 
     46 static int	clock_match(device_t, cfdata_t, void *);
     47 static void	clock_attach(device_t, device_t, void *);
     48 
     49 static void 	clock_intr(int);
     50 
     51 typedef struct clock_softc {
     52 	device_t	sc_dev;
     53 } clock_softc_t;
     54 
     55 extern int	setitimer(int, const struct itimerval *, struct itimerval *);
     56 
     57 CFATTACH_DECL_NEW(clock, sizeof(clock_softc_t),
     58     clock_match, clock_attach, NULL, NULL);
     59 
     60 static int
     61 clock_match(device_t parent, cfdata_t match, void *opaque)
     62 {
     63 	struct thunkbus_attach_args *taa = opaque;
     64 
     65 	if (taa->taa_type != THUNKBUS_TYPE_CLOCK)
     66 		return 0;
     67 
     68 	return 1;
     69 }
     70 
     71 static void
     72 clock_attach(device_t parent, device_t self, void *opaque)
     73 {
     74 	clock_softc_t *sc = device_private(self);
     75 	struct itimerval itimer;
     76 
     77 	aprint_naive("\n");
     78 	aprint_normal("\n");
     79 
     80 	sc->sc_dev = self;
     81 
     82 	(void)signal(SIGALRM, clock_intr);
     83 
     84 	itimer.it_interval.tv_sec = 0;
     85 	itimer.it_interval.tv_usec = 10000;
     86 	itimer.it_value = itimer.it_interval;
     87 	(void)setitimer(ITIMER_REAL, &itimer, NULL);
     88 }
     89 
     90 static void
     91 clock_intr(int notused)
     92 {
     93 	extern int usermode_x;
     94 	struct clockframe cf;
     95 
     96 #if notyet
     97 	/* XXXJDM */
     98 	if (usermode_x > IPL_SOFTCLOCK)
     99 		return;
    100 #endif
    101 
    102 	hardclock(&cf);
    103 }
    104