1 /* $NetBSD: clock.c,v 1.4 2009/11/27 03:23:14 rmind 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 1.4 2009/11/27 03:23:14 rmind Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/proc.h> 34 #include <sys/systm.h> 35 #include <sys/device.h> 36 #include <sys/timetc.h> 37 38 #include <machine/mainbus.h> 39 40 static int clock_match(device_t, cfdata_t, void *); 41 static void clock_attach(device_t, device_t, void *); 42 43 static void clock_intr(int); 44 static u_int clock_getcounter(struct timecounter *); 45 46 typedef struct clock_softc { 47 device_t sc_dev; 48 } clock_softc_t; 49 50 extern int setitimer(int, const struct itimerval *, struct itimerval *); 51 52 static struct timecounter clock_timecounter = { 53 clock_getcounter, /* get_timecount */ 54 0, /* no poll_pps */ 55 ~0u, /* counter_mask */ 56 1000000, /* frequency */ 57 "gettimeofday", /* name */ 58 100, /* quality */ 59 NULL, /* prev */ 60 NULL, /* next */ 61 }; 62 63 CFATTACH_DECL_NEW(clock, sizeof(clock_softc_t), 64 clock_match, clock_attach, NULL, NULL); 65 66 static int 67 clock_match(device_t parent, cfdata_t match, void *opaque) 68 { 69 struct thunkbus_attach_args *taa = opaque; 70 71 if (taa->taa_type != THUNKBUS_TYPE_CLOCK) 72 return 0; 73 74 return 1; 75 } 76 77 static void 78 clock_attach(device_t parent, device_t self, void *opaque) 79 { 80 clock_softc_t *sc = device_private(self); 81 struct itimerval itimer; 82 83 aprint_naive("\n"); 84 aprint_normal("\n"); 85 86 sc->sc_dev = self; 87 88 (void)signal(SIGALRM, clock_intr); 89 90 itimer.it_interval.tv_sec = 0; 91 itimer.it_interval.tv_usec = 10000; 92 itimer.it_value = itimer.it_interval; 93 (void)setitimer(ITIMER_REAL, &itimer, NULL); 94 95 tc_init(&clock_timecounter); 96 } 97 98 static void 99 clock_intr(int notused) 100 { 101 extern int usermode_x; 102 struct clockframe cf; 103 104 #if notyet 105 /* XXXJDM */ 106 if (usermode_x > IPL_SOFTCLOCK) 107 return; 108 #endif 109 110 hardclock(&cf); 111 } 112 113 static u_int 114 clock_getcounter(struct timecounter *tc) 115 { 116 extern int gettimeofday(struct timeval *, void *); 117 struct timeval tv; 118 119 gettimeofday(&tv, NULL); 120 return tv.tv_sec * 1000000 + tv.tv_usec; 121 } 122