1 /* $NetBSD: clock.c,v 1.3 2009/10/21 16:06:59 snj Exp $ */ 2 3 /*- 4 * Copyright (c) 2007 Jared D. McNeill <jmcneill@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 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: clock.c,v 1.3 2009/10/21 16:06:59 snj Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/proc.h> 34 #include <sys/user.h> 35 #include <sys/systm.h> 36 #include <sys/device.h> 37 #include <sys/timetc.h> 38 39 #include <machine/mainbus.h> 40 41 static int clock_match(device_t, cfdata_t, void *); 42 static void clock_attach(device_t, device_t, void *); 43 44 static void clock_intr(int); 45 static u_int clock_getcounter(struct timecounter *); 46 47 typedef struct clock_softc { 48 device_t sc_dev; 49 } clock_softc_t; 50 51 extern int setitimer(int, const struct itimerval *, struct itimerval *); 52 53 static struct timecounter clock_timecounter = { 54 clock_getcounter, /* get_timecount */ 55 0, /* no poll_pps */ 56 ~0u, /* counter_mask */ 57 1000000, /* frequency */ 58 "gettimeofday", /* name */ 59 100, /* quality */ 60 NULL, /* prev */ 61 NULL, /* next */ 62 }; 63 64 CFATTACH_DECL_NEW(clock, sizeof(clock_softc_t), 65 clock_match, clock_attach, NULL, NULL); 66 67 static int 68 clock_match(device_t parent, cfdata_t match, void *opaque) 69 { 70 struct thunkbus_attach_args *taa = opaque; 71 72 if (taa->taa_type != THUNKBUS_TYPE_CLOCK) 73 return 0; 74 75 return 1; 76 } 77 78 static void 79 clock_attach(device_t parent, device_t self, void *opaque) 80 { 81 clock_softc_t *sc = device_private(self); 82 struct itimerval itimer; 83 84 aprint_naive("\n"); 85 aprint_normal("\n"); 86 87 sc->sc_dev = self; 88 89 (void)signal(SIGALRM, clock_intr); 90 91 itimer.it_interval.tv_sec = 0; 92 itimer.it_interval.tv_usec = 10000; 93 itimer.it_value = itimer.it_interval; 94 (void)setitimer(ITIMER_REAL, &itimer, NULL); 95 96 tc_init(&clock_timecounter); 97 } 98 99 static void 100 clock_intr(int notused) 101 { 102 extern int usermode_x; 103 struct clockframe cf; 104 105 #if notyet 106 /* XXXJDM */ 107 if (usermode_x > IPL_SOFTCLOCK) 108 return; 109 #endif 110 111 hardclock(&cf); 112 } 113 114 static u_int 115 clock_getcounter(struct timecounter *tc) 116 { 117 extern int gettimeofday(struct timeval *, void *); 118 struct timeval tv; 119 120 gettimeofday(&tv, NULL); 121 return tv.tv_sec * 1000000 + tv.tv_usec; 122 } 123