2 * Copyright (c) 2006 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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
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.
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
34 * $DragonFly: src/sys/platform/vkernel/platform/systimer.c,v 1.8 2007/01/14 20:07:15 dillon Exp $
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>
46 #include <machine/cpu.h>
47 #include <machine/globaldata.h>
48 #include <machine/md_var.h>
50 #include <sys/thread2.h>
56 SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set,
57 CTLFLAG_RW, &disable_rtc_set, 0, "");
60 int wall_cmos_clock = 0;
63 * SYSTIMER IMPLEMENTATION
65 static sysclock_t vkernel_timer_get_timecount(void);
66 static void vkernel_timer_construct(struct cputimer *timer, sysclock_t oclock);
67 /*static void cputimer_intr_hard(int signo);*/
68 static void cputimer_intr(void *dummy, void *frame);
70 static struct cputimer vkernel_cputimer = {
71 SLIST_ENTRY_INITIALIZER,
75 vkernel_timer_get_timecount,
76 cputimer_default_fromhz,
77 cputimer_default_fromus,
78 vkernel_timer_construct,
79 cputimer_default_destruct,
80 1000000, /* 1us granularity */
85 * Initialize the systimer subsystem, called from MI code in early boot.
90 kprintf("initclocks\n");
91 cputimer_register(&vkernel_cputimer);
92 cputimer_select(&vkernel_cputimer, 0);
96 * Constructor to initialize timer->base and get an initial count.
99 vkernel_timer_construct(struct cputimer *timer, sysclock_t oclock)
102 timer->base = oclock - vkernel_timer_get_timecount();
106 * Get the current counter, with 2's complement rollover.
109 vkernel_timer_get_timecount(void)
111 static sysclock_t vkernel_last_counter;
115 /* XXX NO PROTECTION FROM INTERRUPT */
116 gettimeofday(&tv, NULL);
117 counter = (sysclock_t)tv.tv_usec;
118 if (counter < vkernel_last_counter)
119 vkernel_cputimer.base += 1000000;
120 vkernel_last_counter = counter;
121 counter += vkernel_cputimer.base;
126 * Configure the interrupt for our core systimer
129 cputimer_intr_config(struct cputimer *timer)
133 kprintf("cputimer_intr_config\n");
134 bzero(&sa, sizeof(sa));
135 sa.sa_mailbox = &mdcpu->gd_mailbox;
136 sa.sa_flags = SA_MAILBOX;
137 sigemptyset(&sa.sa_mask);
138 sigaddset(&sa.sa_mask, SIGIO);
139 sigaction(SIGALRM, &sa, NULL);
140 register_int(0, cputimer_intr, NULL, "timer",
141 NULL, INTR_FAST|INTR_MPSAFE);
145 * Reload the interrupt for our core systimer.
148 cputimer_intr_reload(sysclock_t reload)
152 it.it_interval.tv_usec = 0;
153 it.it_interval.tv_sec = 0;
154 it.it_value.tv_usec = reload;
155 it.it_value.tv_sec = 0;
157 setitimer(ITIMER_REAL, &it, NULL);
161 signalmailbox(struct intrframe *frame)
163 struct mdglobaldata *gd = mdcpu;
165 if (gd->gd_mailbox) {
168 cputimer_intr(NULL, frame);
175 * Clock interrupt (SIGALRM)
177 * Upon a clock interrupt, dispatch to the systimer subsystem
179 * XXX NO FRAME PROVIDED
183 cputimer_intr_hard(int signo)
185 struct mdglobaldata *gd = mdcpu;
188 * XXX check critical section hack
190 if (curthread->td_pri >= TDPRI_CRIT) {
191 atomic_set_int(&gd->gd_fpending, 1);
192 atomic_set_int(&gd->mi.gd_reqflags, RQF_INTPEND);
195 cputimer_intr(NULL, NULL);
205 * NOTE: frame is a struct intrframe pointer.
209 cputimer_intr(void *dummy, void *frame)
211 static sysclock_t sysclock_count;
212 struct globaldata *gd = mycpu;
214 struct globaldata *gscan;
217 sysclock_count = sys_cputimer->count();
219 for (n = 0; n < ncpus; ++n) {
220 gscan = globaldata_find(n);
221 if (TAILQ_FIRST(&gscan->gd_systimerq) == NULL)
224 lwkt_send_ipiq3(gscan, (ipifunc3_t)systimer_intr,
227 systimer_intr(&sysclock_count, 0, frame);
231 if (TAILQ_FIRST(&gd->gd_systimerq) != NULL)
232 systimer_intr(&sysclock_count, 0, frame);
237 * Initialize the time of day register, based on the time base which is, e.g.
241 inittodr(time_t base)
246 gettimeofday(&tv, NULL);
247 ts.tv_sec = tv.tv_sec;
248 ts.tv_nsec = tv.tv_usec * 1000;
253 * Write system time back to the RTC