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 #define VKTIMER_FREQ 1000000 /* 1us granularity */
58 static void vktimer_intr(void *dummy, struct intrframe *frame);
61 SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set,
62 CTLFLAG_RW, &disable_rtc_set, 0, "");
63 SYSCTL_INT(_hw, OID_AUTO, tsc_present, CTLFLAG_RD,
64 &tsc_present, 0, "TSC Available");
65 SYSCTL_QUAD(_hw, OID_AUTO, tsc_frequency, CTLFLAG_RD,
66 &tsc_frequency, 0, "TSC Frequency");
69 int wall_cmos_clock = 0;
70 static struct kqueue_info *kqueue_timer_info;
72 static int cputimer_mib[16];
73 static int cputimer_miblen;
76 * SYSTIMER IMPLEMENTATION
78 static sysclock_t vkernel_timer_get_timecount(void);
79 static void vkernel_timer_construct(struct cputimer *timer, sysclock_t oclock);
81 static struct cputimer vkernel_cputimer = {
82 SLIST_ENTRY_INITIALIZER,
86 vkernel_timer_get_timecount,
87 cputimer_default_fromhz,
88 cputimer_default_fromus,
89 vkernel_timer_construct,
90 cputimer_default_destruct,
95 static void vktimer_intr_reload(struct cputimer_intr *, sysclock_t);
96 static void vktimer_intr_initclock(struct cputimer_intr *, boolean_t);
98 static struct cputimer_intr vkernel_cputimer_intr = {
100 .reload = vktimer_intr_reload,
101 .enable = cputimer_intr_default_enable,
102 .config = cputimer_intr_default_config,
103 .restart = cputimer_intr_default_restart,
104 .pmfixup = cputimer_intr_default_pmfixup,
105 .initclock = vktimer_intr_initclock,
106 .next = SLIST_ENTRY_INITIALIZER,
108 .type = CPUTIMER_INTR_VKERNEL,
109 .prio = CPUTIMER_INTR_PRIO_VKERNEL,
110 .caps = CPUTIMER_INTR_CAP_NONE
114 * Initialize the systimer subsystem, called from MI code in early boot.
117 cpu_initclocks(void *arg __unused)
121 kprintf("initclocks\n");
122 len = sizeof(vkernel_cputimer.freq);
123 if (sysctlbyname("kern.cputimer.freq", &vkernel_cputimer.freq, &len,
125 panic("cpu_initclocks: can't get kern.cputimer.freq!");
127 len = sizeof(cputimer_mib)/sizeof(cputimer_mib[0]);
128 if (sysctlnametomib("kern.cputimer.clock", cputimer_mib, &len) < 0)
129 panic("cpu_initclocks: can't get kern.cputimer.clock!");
130 cputimer_miblen = len;
132 cputimer_intr_register(&vkernel_cputimer_intr);
133 cputimer_intr_select(&vkernel_cputimer_intr, 0);
135 cputimer_register(&vkernel_cputimer);
136 cputimer_select(&vkernel_cputimer, 0);
138 SYSINIT(clocksvk, SI_BOOT2_CLOCKREG, SI_ORDER_FIRST, cpu_initclocks, NULL)
141 * Constructor to initialize timer->base and get an initial count.
144 vkernel_timer_construct(struct cputimer *timer, sysclock_t oclock)
147 timer->base = oclock - vkernel_timer_get_timecount();
151 * Get the current counter, with 2's complement rollover.
153 * NOTE! MPSAFE, possibly no critical section
156 vkernel_timer_get_timecount(void)
161 len = sizeof(counter);
162 if (sysctl(cputimer_mib, cputimer_miblen, &counter, &len,
164 panic("vkernel_timer_get_timecount: sysctl failed!");
170 * Initialize the interrupt for our core systimer. Use the kqueue timer
174 vktimer_intr_initclock(struct cputimer_intr *cti __unused,
175 boolean_t selected __unused)
177 KKASSERT(kqueue_timer_info == NULL);
178 kqueue_timer_info = kqueue_add_timer(vktimer_intr, NULL);
182 * Reload the interrupt for our core systimer. Because the caller's
183 * reload calculation can be negatively indexed, we need a minimal
184 * check to ensure that a reasonable reload value is selected.
187 vktimer_intr_reload(struct cputimer_intr *cti __unused, sysclock_t reload)
189 if (kqueue_timer_info) {
192 kqueue_reload_timer(kqueue_timer_info, (reload + 999) / 1000);
199 * NOTE: frame is a struct intrframe pointer.
202 vktimer_intr(void *dummy, struct intrframe *frame)
204 static sysclock_t sysclock_count;
205 struct globaldata *gd = mycpu;
207 struct globaldata *gscan;
211 sysclock_count = sys_cputimer->count();
213 for (n = 0; n < ncpus; ++n) {
214 gscan = globaldata_find(n);
215 if (TAILQ_FIRST(&gscan->gd_systimerq) == NULL)
218 lwkt_send_ipiq3(gscan, (ipifunc3_t)systimer_intr,
221 systimer_intr(&sysclock_count, 0, frame);
225 if (TAILQ_FIRST(&gd->gd_systimerq) != NULL)
226 systimer_intr(&sysclock_count, 0, frame);
231 * Initialize the time of day register, based on the time base which is, e.g.
235 inittodr(time_t base)
240 gettimeofday(&tv, NULL);
241 ts.tv_sec = tv.tv_sec;
242 ts.tv_nsec = tv.tv_usec * 1000;
247 * Write system time back to the RTC
255 * We need to enter a critical section to prevent signals from recursing
267 DRIVERSLEEP(int usec)
269 if (mycpu->gd_intr_nesting_level)
271 else if (1000000 / usec >= hz)
272 tsleep(DRIVERSLEEP, 0, "DELAY", 1000000 / usec / hz + 1);