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 1.13 2007/05/01 00:05:18 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>
55 static void cputimer_intr(void *dummy, struct intrframe *frame);
58 SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set,
59 CTLFLAG_RW, &disable_rtc_set, 0, "");
62 int wall_cmos_clock = 0;
63 static struct kqueue_info *kqueue_timer_info;
67 * SYSTIMER IMPLEMENTATION
69 static sysclock_t vkernel_timer_get_timecount(void);
70 static void vkernel_timer_construct(struct cputimer *timer, sysclock_t oclock);
72 static struct cputimer vkernel_cputimer = {
73 SLIST_ENTRY_INITIALIZER,
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 */
87 * Initialize the systimer subsystem, called from MI code in early boot.
90 cpu_initclocks(void *arg __unused)
92 kprintf("initclocks\n");
93 cputimer_register(&vkernel_cputimer);
94 cputimer_select(&vkernel_cputimer, 0);
96 SYSINIT(clocksvk, SI_BOOT2_CLOCKREG, SI_ORDER_FIRST, cpu_initclocks, NULL)
99 * Constructor to initialize timer->base and get an initial count.
102 vkernel_timer_construct(struct cputimer *timer, sysclock_t oclock)
105 timer->base = oclock - vkernel_timer_get_timecount();
109 * Get the current counter, with 2's complement rollover.
112 vkernel_timer_get_timecount(void)
114 static sysclock_t vkernel_last_counter;
118 /* XXX NO PROTECTION FROM INTERRUPT */
119 gettimeofday(&tv, NULL);
120 counter = (sysclock_t)tv.tv_usec;
121 if (counter < vkernel_last_counter)
122 vkernel_cputimer.base += 1000000;
123 vkernel_last_counter = counter;
124 counter += vkernel_cputimer.base;
129 * Configure the interrupt for our core systimer. Use the kqueue timer
133 cputimer_intr_config(struct cputimer *timer)
135 kqueue_timer_info = kqueue_add_timer(cputimer_intr, NULL);
139 * Reload the interrupt for our core systimer. Because the caller's
140 * reload calculation can be negatively indexed, we need a minimal
141 * check to ensure that a reasonable reload value is selected.
144 cputimer_intr_reload(sysclock_t reload)
146 if (kqueue_timer_info) {
149 kqueue_reload_timer(kqueue_timer_info, (reload + 999) / 1000);
156 * NOTE: frame is a struct intrframe pointer.
159 cputimer_intr(void *dummy, struct intrframe *frame)
161 static sysclock_t sysclock_count;
162 struct globaldata *gd = mycpu;
164 struct globaldata *gscan;
168 sysclock_count = sys_cputimer->count();
170 for (n = 0; n < ncpus; ++n) {
171 gscan = globaldata_find(n);
172 if (TAILQ_FIRST(&gscan->gd_systimerq) == NULL)
175 lwkt_send_ipiq3(gscan, (ipifunc3_t)systimer_intr,
178 systimer_intr(&sysclock_count, 0, frame);
182 if (TAILQ_FIRST(&gd->gd_systimerq) != NULL)
183 systimer_intr(&sysclock_count, 0, frame);
188 * Initialize the time of day register, based on the time base which is, e.g.
192 inittodr(time_t base)
197 gettimeofday(&tv, NULL);
198 ts.tv_sec = tv.tv_sec;
199 ts.tv_nsec = tv.tv_usec * 1000;
204 * Write system time back to the RTC
218 DRIVERSLEEP(int usec)
220 if (mycpu->gd_intr_nesting_level)
222 else if (1000000 / usec >= hz)
223 tsleep(DRIVERSLEEP, 0, "DELAY", 1000000 / usec / hz + 1);