1 /* $NetBSD: clock.c,v 1.25 2012/01/14 21:42:51 reinoud 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 "opt_hz.h" 30 31 #include <sys/cdefs.h> 32 __KERNEL_RCSID(0, "$NetBSD: clock.c,v 1.25 2012/01/14 21:42:51 reinoud Exp $"); 33 34 #include <sys/param.h> 35 #include <sys/proc.h> 36 #include <sys/systm.h> 37 #include <sys/device.h> 38 #include <sys/lwp.h> 39 #include <sys/cpu.h> 40 #include <sys/malloc.h> 41 #include <sys/timetc.h> 42 #include <sys/time.h> 43 44 #include <machine/pcb.h> 45 #include <machine/mainbus.h> 46 #include <machine/thunk.h> 47 48 #include <dev/clock_subr.h> 49 50 static int clock_match(device_t, cfdata_t, void *); 51 static void clock_attach(device_t, device_t, void *); 52 53 static void clock_signal(int sig, siginfo_t *info, void *ctx); 54 static unsigned int clock_getcounter(struct timecounter *); 55 56 static int clock_todr_gettime(struct todr_chip_handle *, struct timeval *); 57 58 struct clock_softc { 59 device_t sc_dev; 60 struct todr_chip_handle sc_todr; 61 }; 62 63 static struct timecounter clock_timecounter = { 64 clock_getcounter, /* get_timecount */ 65 0, /* no poll_pps */ 66 ~0u, /* counter_mask */ 67 1000000000ULL, /* frequency */ 68 "CLOCK_MONOTONIC", /* name */ 69 -100, /* quality */ 70 NULL, /* prev */ 71 NULL, /* next */ 72 }; 73 74 timer_t clock_timerid; 75 76 CFATTACH_DECL_NEW(clock, sizeof(struct clock_softc), 77 clock_match, clock_attach, NULL, NULL); 78 79 static int 80 clock_match(device_t parent, cfdata_t match, void *opaque) 81 { 82 struct thunkbus_attach_args *taa = opaque; 83 84 if (taa->taa_type != THUNKBUS_TYPE_CLOCK) 85 return 0; 86 87 return 1; 88 } 89 90 static void 91 clock_attach(device_t parent, device_t self, void *opaque) 92 { 93 static struct sigaction sa; 94 struct clock_softc *sc = device_private(self); 95 96 aprint_naive("\n"); 97 aprint_normal("\n"); 98 99 sc->sc_dev = self; 100 101 sc->sc_todr.todr_gettime = clock_todr_gettime; 102 todr_attach(&sc->sc_todr); 103 104 memset(&sa, 0, sizeof(sa)); 105 thunk_sigemptyset(&sa.sa_mask); 106 sa.sa_sigaction = clock_signal; 107 sa.sa_flags = SA_RESTART | SA_ONSTACK; 108 if (thunk_sigaction(SIGALRM, &sa, NULL) == -1) 109 panic("couldn't register SIGALRM handler : %d", 110 thunk_geterrno()); 111 112 clock_timerid = thunk_timer_attach(); 113 114 clock_timecounter.tc_quality = 1000; 115 tc_init(&clock_timecounter); 116 } 117 118 static void 119 clock_intr(void *priv) 120 { 121 struct clockframe cf; 122 int nticks = thunk_timer_getoverrun(clock_timerid) + 1; 123 124 while (nticks-- > 0) { 125 hardclock(&cf); 126 } 127 } 128 129 static void 130 clock_signal(int sig, siginfo_t *info, void *ctx) 131 { 132 curcpu()->ci_idepth++; 133 spl_intr(IPL_SOFTCLOCK, clock_intr, NULL); 134 curcpu()->ci_idepth--; 135 } 136 137 static unsigned int 138 clock_getcounter(struct timecounter *tc) 139 { 140 return thunk_getcounter(); 141 } 142 143 static int 144 clock_todr_gettime(struct todr_chip_handle *tch, struct timeval *tv) 145 { 146 struct thunk_timeval ttv; 147 int error; 148 149 error = thunk_gettimeofday(&ttv, NULL); 150 if (error) 151 return error; 152 153 tv->tv_sec = ttv.tv_sec; 154 tv->tv_usec = ttv.tv_usec; 155 156 return 0; 157 } 158