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 1.15 2007/07/02 15:18:51 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;
65 static int cputimer_mib[16];
66 static int cputimer_miblen;
70 * SYSTIMER IMPLEMENTATION
72 static sysclock_t vkernel_timer_get_timecount(void);
73 static void vkernel_timer_construct(struct cputimer *timer, sysclock_t oclock);
75 static struct cputimer vkernel_cputimer = {
76 SLIST_ENTRY_INITIALIZER,
80 vkernel_timer_get_timecount,
81 cputimer_default_fromhz,
82 cputimer_default_fromus,
83 vkernel_timer_construct,
84 cputimer_default_destruct,
85 1000000, /* 1us granularity */
90 * Initialize the systimer subsystem, called from MI code in early boot.
93 cpu_initclocks(void *arg __unused)
96 kprintf("initclocks\n");
97 len = sizeof(vkernel_cputimer.freq);
98 if (sysctlbyname("kern.cputimer.freq", &vkernel_cputimer.freq, &len,
100 panic("cpu_initclocks: can't get kern.cputimer.freq!");
102 len = sizeof(cputimer_mib)/sizeof(cputimer_mib[0]);
103 if (sysctlnametomib("kern.cputimer.clock", cputimer_mib, &len) < 0)
104 panic("cpu_initclocks: can't get kern.cputimer.clock!");
105 cputimer_miblen = len;
106 cputimer_register(&vkernel_cputimer);
107 cputimer_select(&vkernel_cputimer, 0);
109 SYSINIT(clocksvk, SI_BOOT2_CLOCKREG, SI_ORDER_FIRST, cpu_initclocks, NULL)
112 * Constructor to initialize timer->base and get an initial count.
115 vkernel_timer_construct(struct cputimer *timer, sysclock_t oclock)
118 timer->base = oclock - vkernel_timer_get_timecount();
122 * Get the current counter, with 2's complement rollover.
124 * NOTE! MPSAFE, possibly no critical section
127 vkernel_timer_get_timecount(void)
132 len = sizeof(counter);
133 if (sysctl(cputimer_mib, cputimer_miblen, &counter, &len,
135 panic("vkernel_timer_get_timecount: sysctl failed!");
141 * Configure the interrupt for our core systimer. Use the kqueue timer
145 cputimer_intr_config(struct cputimer *timer)
147 kqueue_timer_info = kqueue_add_timer(cputimer_intr, NULL);
151 * Reload the interrupt for our core systimer. Because the caller's
152 * reload calculation can be negatively indexed, we need a minimal
153 * check to ensure that a reasonable reload value is selected.
156 cputimer_intr_reload(sysclock_t reload)
158 if (kqueue_timer_info) {
161 kqueue_reload_timer(kqueue_timer_info, (reload + 999) / 1000);
168 * NOTE: frame is a struct intrframe pointer.
171 cputimer_intr(void *dummy, struct intrframe *frame)
173 static sysclock_t sysclock_count;
174 struct globaldata *gd = mycpu;
176 struct globaldata *gscan;
180 sysclock_count = sys_cputimer->count();
182 for (n = 0; n < ncpus; ++n) {
183 gscan = globaldata_find(n);
184 if (TAILQ_FIRST(&gscan->gd_systimerq) == NULL)
187 lwkt_send_ipiq3(gscan, (ipifunc3_t)systimer_intr,
190 systimer_intr(&sysclock_count, 0, frame);
194 if (TAILQ_FIRST(&gd->gd_systimerq) != NULL)
195 systimer_intr(&sysclock_count, 0, frame);
200 * Initialize the time of day register, based on the time base which is, e.g.
204 inittodr(time_t base)
209 gettimeofday(&tv, NULL);
210 ts.tv_sec = tv.tv_sec;
211 ts.tv_nsec = tv.tv_usec * 1000;
216 * Write system time back to the RTC
230 DRIVERSLEEP(int usec)
232 if (mycpu->gd_intr_nesting_level)
234 else if (1000000 / usec >= hz)
235 tsleep(DRIVERSLEEP, 0, "DELAY", 1000000 / usec / hz + 1);