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 1.13 2007/05/01 00:05:18 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/globaldata.h>
  48 #include <machine/md_var.h>
  49
  50 #include <sys/thread2.h>
  51
  52 #include <unistd.h>
  53 #include <signal.h>
  54
  55 static void cputimer_intr(void *dummy, struct intrframe *frame);
  56
  57 int disable_rtc_set;
  58 SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set,
  59            CTLFLAG_RW, &disable_rtc_set, 0, "");
  60
  61 int adjkerntz;
  62 int wall_cmos_clock = 0;
  63 static struct kqueue_info *kqueue_timer_info;
  64
  65
  66 /*
  67  * SYSTIMER IMPLEMENTATION
  68  */
  69 static sysclock_t vkernel_timer_get_timecount(void);
  70 static void vkernel_timer_construct(struct cputimer *timer, sysclock_t oclock);
  71
  72 static struct cputimer vkernel_cputimer = {
  73         SLIST_ENTRY_INITIALIZER,
  74         "VKERNEL",
  75         CPUTIMER_PRI_VKERNEL,
  76         CPUTIMER_VKERNEL,
  77         vkernel_timer_get_timecount,
  78         cputimer_default_fromhz,
  79         cputimer_default_fromus,
  80         vkernel_timer_construct,
  81         cputimer_default_destruct,
  82         1000000,                        /* 1us granularity */
  83         0, 0, 0
  84 };
  85
  86 /*
  87  * Initialize the systimer subsystem, called from MI code in early boot.
  88  */
  89 void
  90 cpu_initclocks(void *arg __unused)
  91 {
  92         kprintf("initclocks\n");
  93         cputimer_register(&vkernel_cputimer);
  94         cputimer_select(&vkernel_cputimer, 0);
  95         kprintf("initclocks end\n");
  96 }
  97 SYSINIT(clocksvk, SI_BOOT2_CLOCKREG, SI_ORDER_FIRST, cpu_initclocks, NULL)
  98
  99 /*
 100  * Constructor to initialize timer->base and get an initial count.
 101  */
 102 static void
 103 vkernel_timer_construct(struct cputimer *timer, sysclock_t oclock)
 104 {
 105         timer->base = 0;
 106         timer->base = oclock - vkernel_timer_get_timecount();
 107 }
 108
 109 /*
 110  * Get the current counter, with 2's complement rollover.
 111  */
 112 static sysclock_t
 113 vkernel_timer_get_timecount(void)
 114 {
 115         static sysclock_t vkernel_last_counter;
 116         struct timeval tv;
 117         sysclock_t counter;
 118
 119         /* XXX NO PROTECTION FROM INTERRUPT */
 120         gettimeofday(&tv, NULL);
 121         counter = (sysclock_t)tv.tv_usec;
 122         if (counter < vkernel_last_counter)
 123                 vkernel_cputimer.base += 1000000;
 124         vkernel_last_counter = counter;
 125         counter += vkernel_cputimer.base;
 126         return(counter);
 127 }
 128
 129 /*
 130  * Configure the interrupt for our core systimer.  Use the kqueue timer
 131  * support functions.
 132  */
 133 void
 134 cputimer_intr_config(struct cputimer *timer)
 135 {
 136         kqueue_timer_info = kqueue_add_timer(cputimer_intr, NULL);
 137 }
 138
 139 /*
 140  * Reload the interrupt for our core systimer.  Because the caller's
 141  * reload calculation can be negatively indexed, we need a minimal
 142  * check to ensure that a reasonable reload value is selected.
 143  */
 144 void
 145 cputimer_intr_reload(sysclock_t reload)
 146 {
 147         if (kqueue_timer_info) {
 148                 if ((int)reload < 1)
 149                         reload = 1;
 150                 kqueue_reload_timer(kqueue_timer_info, (reload + 999) / 1000);
 151         }
 152 }
 153
 154 /*
 155  * clock interrupt.
 156  *
 157  * NOTE: frame is a struct intrframe pointer.
 158  */
 159 static void
 160 cputimer_intr(void *dummy, struct intrframe *frame)
 161 {
 162         static sysclock_t sysclock_count;
 163         struct globaldata *gd = mycpu;
 164 #ifdef SMP
 165         struct globaldata *gscan;
 166         int n;
 167 #endif
 168
 169         sysclock_count = sys_cputimer->count();
 170 #ifdef SMP
 171         for (n = 0; n < ncpus; ++n) {
 172                 gscan = globaldata_find(n);
 173                 if (TAILQ_FIRST(&gscan->gd_systimerq) == NULL)
 174                         continue;
 175                 if (gscan != gd) {
 176                         lwkt_send_ipiq3(gscan, (ipifunc3_t)systimer_intr,
 177                                         &sysclock_count, 0);
 178                 } else {
 179                         systimer_intr(&sysclock_count, 0, frame);
 180                 }
 181         }
 182 #else
 183         if (TAILQ_FIRST(&gd->gd_systimerq) != NULL)
 184                 systimer_intr(&sysclock_count, 0, frame);
 185 #endif
 186 }
 187
 188 /*
 189  * Initialize the time of day register, based on the time base which is, e.g.
 190  * from a filesystem.
 191  */
 192 void
 193 inittodr(time_t base)
 194 {
 195         struct timespec ts;
 196         struct timeval tv;
 197
 198         gettimeofday(&tv, NULL);
 199         ts.tv_sec = tv.tv_sec;
 200         ts.tv_nsec = tv.tv_usec * 1000;
 201         set_timeofday(&ts);
 202 }
 203
 204 /*
 205  * Write system time back to the RTC
 206  */
 207 void
 208 resettodr(void)
 209 {
 210 }
 211
 212 void
 213 DELAY(int usec)
 214 {
 215         usleep(usec);
 216 }
 217
 218 void
 219 DRIVERSLEEP(int usec)
 220 {
 221         if (mycpu->gd_intr_nesting_level)
 222                 DELAY(usec);
 223         else if (1000000 / usec >= hz)
 224                 tsleep(DRIVERSLEEP, 0, "DELAY", 1000000 / usec / hz + 1);
 225         else
 226                 usleep(usec);
 227 }
 228