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 1.17 2008/06/06 13:19:25 swildner 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/clock.h>
48 #include <machine/globaldata.h>
49 #include <machine/md_var.h>
51 #include <sys/thread2.h>
56 static void cputimer_intr(void *dummy, struct intrframe *frame);
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");
67 int wall_cmos_clock = 0;
68 static struct kqueue_info *kqueue_timer_info;
70 static int cputimer_mib[16];
71 static int cputimer_miblen;
75 * SYSTIMER IMPLEMENTATION
77 static sysclock_t vkernel_timer_get_timecount(void);
78 static void vkernel_timer_construct(struct cputimer *timer, sysclock_t oclock);
80 static struct cputimer vkernel_cputimer = {
81 SLIST_ENTRY_INITIALIZER,
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 */
95 * Initialize the systimer subsystem, called from MI code in early boot.
98 cpu_initclocks(void *arg __unused)
101 kprintf("initclocks\n");
102 len = sizeof(vkernel_cputimer.freq);
103 if (sysctlbyname("kern.cputimer.freq", &vkernel_cputimer.freq, &len,
105 panic("cpu_initclocks: can't get kern.cputimer.freq!");
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);
114 SYSINIT(clocksvk, SI_BOOT2_CLOCKREG, SI_ORDER_FIRST, cpu_initclocks, NULL)
117 * Constructor to initialize timer->base and get an initial count.
120 vkernel_timer_construct(struct cputimer *timer, sysclock_t oclock)
123 timer->base = oclock - vkernel_timer_get_timecount();
127 * Get the current counter, with 2's complement rollover.
129 * NOTE! MPSAFE, possibly no critical section
132 vkernel_timer_get_timecount(void)
137 len = sizeof(counter);
138 if (sysctl(cputimer_mib, cputimer_miblen, &counter, &len,
140 panic("vkernel_timer_get_timecount: sysctl failed!");
146 * Configure the interrupt for our core systimer. Use the kqueue timer
150 cputimer_intr_config(struct cputimer *timer)
152 kqueue_timer_info = kqueue_add_timer(cputimer_intr, NULL);
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.
161 cputimer_intr_reload(sysclock_t reload)
163 if (kqueue_timer_info) {
166 kqueue_reload_timer(kqueue_timer_info, (reload + 999) / 1000);
173 * NOTE: frame is a struct intrframe pointer.
176 cputimer_intr(void *dummy, struct intrframe *frame)
178 static sysclock_t sysclock_count;
179 struct globaldata *gd = mycpu;
181 struct globaldata *gscan;
185 sysclock_count = sys_cputimer->count();
187 for (n = 0; n < ncpus; ++n) {
188 gscan = globaldata_find(n);
189 if (TAILQ_FIRST(&gscan->gd_systimerq) == NULL)
192 lwkt_send_ipiq3(gscan, (ipifunc3_t)systimer_intr,
195 systimer_intr(&sysclock_count, 0, frame);
199 if (TAILQ_FIRST(&gd->gd_systimerq) != NULL)
200 systimer_intr(&sysclock_count, 0, frame);
205 * Initialize the time of day register, based on the time base which is, e.g.
209 inittodr(time_t base)
214 gettimeofday(&tv, NULL);
215 ts.tv_sec = tv.tv_sec;
216 ts.tv_nsec = tv.tv_usec * 1000;
221 * Write system time back to the RTC
235 DRIVERSLEEP(int usec)
237 if (mycpu->gd_intr_nesting_level)
239 else if (1000000 / usec >= hz)
240 tsleep(DRIVERSLEEP, 0, "DELAY", 1000000 / usec / hz + 1);