sys/platform/vkernel/platform/systimer.c

   1 /*
   2  * Copyright (c) 2006 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   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  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/sys/platform/vkernel/platform/systimer.c,v 1.16 2008/05/10 17:24:12 dillon Exp $
  35  */
  36
  37 #include <sys/types.h>
  38 #include <sys/systm.h>
  39 #include <sys/kernel.h>
  40 #include <sys/systimer.h>
  41 #include <sys/sysctl.h>
  42 #include <sys/signal.h>
  43 #include <sys/interrupt.h>
  44 #include <sys/bus.h>
  45 #include <sys/time.h>
  46 #include <machine/cpu.h>
  47 #include <machine/clock.h>
  48 #include <machine/globaldata.h>
  49 #include <machine/md_var.h>
  50
  51 #include <sys/thread2.h>
  52
  53 #include <unistd.h>
  54 #include <signal.h>
  55
  56 static void cputimer_intr(void *dummy, struct intrframe *frame);
  57
  58 int disable_rtc_set;
  59 SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set,
  60            CTLFLAG_RW, &disable_rtc_set, 0, "");
  61 SYSCTL_INT(_hw, OID_AUTO, tsc_present, CTLFLAG_RD,
  62             &tsc_present, 0, "TSC Available");
  63 SYSCTL_QUAD(_hw, OID_AUTO, tsc_frequency, CTLFLAG_RD,
  64             &tsc_frequency, 0, "TSC Frequency");
  65
  66 int adjkerntz;
  67 int wall_cmos_clock = 0;
  68 static struct kqueue_info *kqueue_timer_info;
  69
  70 static int cputimer_mib[16];
  71 static int cputimer_miblen;
  72
  73
  74 /*
  75  * SYSTIMER IMPLEMENTATION
  76  */
  77 static sysclock_t vkernel_timer_get_timecount(void);
  78 static void vkernel_timer_construct(struct cputimer *timer, sysclock_t oclock);
  79
  80 static struct cputimer vkernel_cputimer = {
  81         SLIST_ENTRY_INITIALIZER,
  82         "VKERNEL",
  83         CPUTIMER_PRI_VKERNEL,
  84         CPUTIMER_VKERNEL,
  85         vkernel_timer_get_timecount,
  86         cputimer_default_fromhz,
  87         cputimer_default_fromus,
  88         vkernel_timer_construct,
  89         cputimer_default_destruct,
  90         1000000,                        /* 1us granularity */
  91         0, 0, 0
  92 };
  93
  94 /*
  95  * Initialize the systimer subsystem, called from MI code in early boot.
  96  */
  97 void
  98 cpu_initclocks(void *arg __unused)
  99 {
 100         int len;
 101         kprintf("initclocks\n");
 102         len = sizeof(vkernel_cputimer.freq);
 103         if (sysctlbyname("kern.cputimer.freq", &vkernel_cputimer.freq, &len,
 104                          NULL, NULL) < 0) {
 105                 panic("cpu_initclocks: can't get kern.cputimer.freq!");
 106         }
 107         len = sizeof(cputimer_mib)/sizeof(cputimer_mib[0]);
 108         if (sysctlnametomib("kern.cputimer.clock", cputimer_mib, &len) < 0)
 109                 panic("cpu_initclocks: can't get kern.cputimer.clock!");
 110         cputimer_miblen = len;
 111         cputimer_register(&vkernel_cputimer);
 112         cputimer_select(&vkernel_cputimer, 0);
 113 }
 114 SYSINIT(clocksvk, SI_BOOT2_CLOCKREG, SI_ORDER_FIRST, cpu_initclocks, NULL)
 115
 116 /*
 117  * Constructor to initialize timer->base and get an initial count.
 118  */
 119 static void
 120 vkernel_timer_construct(struct cputimer *timer, sysclock_t oclock)
 121 {
 122         timer->base = 0;
 123         timer->base = oclock - vkernel_timer_get_timecount();
 124 }
 125
 126 /*
 127  * Get the current counter, with 2's complement rollover.
 128  *
 129  * NOTE! MPSAFE, possibly no critical section
 130  */
 131 static sysclock_t
 132 vkernel_timer_get_timecount(void)
 133 {
 134         sysclock_t counter;
 135         size_t len;
 136
 137         len = sizeof(counter);
 138         if (sysctl(cputimer_mib, cputimer_miblen, &counter, &len,
 139                    NULL, NULL) < 0) {
 140                 panic("vkernel_timer_get_timecount: sysctl failed!");
 141         }
 142         return(counter);
 143 }
 144
 145 /*
 146  * Configure the interrupt for our core systimer.  Use the kqueue timer
 147  * support functions.
 148  */
 149 void
 150 cputimer_intr_config(struct cputimer *timer)
 151 {
 152         kqueue_timer_info = kqueue_add_timer(cputimer_intr, NULL);
 153 }
 154
 155 /*
 156  * Reload the interrupt for our core systimer.  Because the caller's
 157  * reload calculation can be negatively indexed, we need a minimal
 158  * check to ensure that a reasonable reload value is selected.
 159  */
 160 void
 161 cputimer_intr_reload(sysclock_t reload)
 162 {
 163         if (kqueue_timer_info) {
 164                 if ((int)reload < 1)
 165                         reload = 1;
 166                 kqueue_reload_timer(kqueue_timer_info, (reload + 999) / 1000);
 167         }
 168 }
 169
 170 /*
 171  * clock interrupt.
 172  *
 173  * NOTE: frame is a struct intrframe pointer.
 174  */
 175 static void
 176 cputimer_intr(void *dummy, struct intrframe *frame)
 177 {
 178         static sysclock_t sysclock_count;
 179         struct globaldata *gd = mycpu;
 180 #ifdef SMP
 181         struct globaldata *gscan;
 182         int n;
 183 #endif
 184
 185         sysclock_count = sys_cputimer->count();
 186 #ifdef SMP
 187         for (n = 0; n < ncpus; ++n) {
 188                 gscan = globaldata_find(n);
 189                 if (TAILQ_FIRST(&gscan->gd_systimerq) == NULL)
 190                         continue;
 191                 if (gscan != gd) {
 192                         lwkt_send_ipiq3(gscan, (ipifunc3_t)systimer_intr,
 193                                         &sysclock_count, 0);
 194                 } else {
 195                         systimer_intr(&sysclock_count, 0, frame);
 196                 }
 197         }
 198 #else
 199         if (TAILQ_FIRST(&gd->gd_systimerq) != NULL)
 200                 systimer_intr(&sysclock_count, 0, frame);
 201 #endif
 202 }
 203
 204 /*
 205  * Initialize the time of day register, based on the time base which is, e.g.
 206  * from a filesystem.
 207  */
 208 void
 209 inittodr(time_t base)
 210 {
 211         struct timespec ts;
 212         struct timeval tv;
 213
 214         gettimeofday(&tv, NULL);
 215         ts.tv_sec = tv.tv_sec;
 216         ts.tv_nsec = tv.tv_usec * 1000;
 217         set_timeofday(&ts);
 218 }
 219
 220 /*
 221  * Write system time back to the RTC
 222  */
 223 void
 224 resettodr(void)
 225 {
 226 }
 227
 228 void
 229 DELAY(int usec)
 230 {
 231         usleep(usec);
 232 }
 233
 234 void
 235 DRIVERSLEEP(int usec)
 236 {
 237         if (mycpu->gd_intr_nesting_level)
 238                 DELAY(usec);
 239         else if (1000000 / usec >= hz)
 240                 tsleep(DRIVERSLEEP, 0, "DELAY", 1000000 / usec / hz + 1);
 241         else
 242                 usleep(usec);
 243 }
 244