vkernel - Add machdep.wall_cmos_clock sysctl.
[dragonfly.git] / sys / platform / vkernel64 / platform / systimer.c
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1/*
2 * Copyright (c) 2006 The DragonFly Project. All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
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
16 * distribution.
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.
20 *
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
32 * SUCH DAMAGE.
33 *
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34 */
35
36#include <sys/types.h>
37#include <sys/systm.h>
38#include <sys/kernel.h>
39#include <sys/systimer.h>
40#include <sys/sysctl.h>
41#include <sys/signal.h>
42#include <sys/interrupt.h>
43#include <sys/bus.h>
44#include <sys/time.h>
45#include <machine/cpu.h>
46#include <machine/clock.h>
47#include <machine/globaldata.h>
48#include <machine/md_var.h>
49
50#include <sys/thread2.h>
51
52#include <unistd.h>
53#include <signal.h>
54
55#define VKTIMER_FREQ 1000000 /* 1us granularity */
56
57static void vktimer_intr(void *dummy, struct intrframe *frame);
58
59int disable_rtc_set;
60SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set,
61 CTLFLAG_RW, &disable_rtc_set, 0, "");
62SYSCTL_INT(_hw, OID_AUTO, tsc_present, CTLFLAG_RD,
63 &tsc_present, 0, "TSC Available");
64SYSCTL_QUAD(_hw, OID_AUTO, tsc_frequency, CTLFLAG_RD,
65 &tsc_frequency, 0, "TSC Frequency");
66
67int adjkerntz;
68int wall_cmos_clock = 0;
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69SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock,
70 CTLFLAG_RD, &wall_cmos_clock, 0, "");
71
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72static struct kqueue_info *kqueue_timer_info;
73
74static int cputimer_mib[16];
75static int cputimer_miblen;
76
77/*
78 * SYSTIMER IMPLEMENTATION
79 */
80static sysclock_t vkernel_timer_get_timecount(void);
81static void vkernel_timer_construct(struct cputimer *timer, sysclock_t oclock);
82
83static struct cputimer vkernel_cputimer = {
84 SLIST_ENTRY_INITIALIZER,
85 "VKERNEL",
86 CPUTIMER_PRI_VKERNEL,
87 CPUTIMER_VKERNEL,
88 vkernel_timer_get_timecount,
89 cputimer_default_fromhz,
90 cputimer_default_fromus,
91 vkernel_timer_construct,
92 cputimer_default_destruct,
93 VKTIMER_FREQ,
94 0, 0, 0
95};
96
97static void vktimer_intr_reload(struct cputimer_intr *, sysclock_t);
98static void vktimer_intr_initclock(struct cputimer_intr *, boolean_t);
99
100static struct cputimer_intr vkernel_cputimer_intr = {
101 .freq = VKTIMER_FREQ,
102 .reload = vktimer_intr_reload,
103 .enable = cputimer_intr_default_enable,
104 .config = cputimer_intr_default_config,
105 .restart = cputimer_intr_default_restart,
106 .pmfixup = cputimer_intr_default_pmfixup,
107 .initclock = vktimer_intr_initclock,
108 .next = SLIST_ENTRY_INITIALIZER,
109 .name = "vkernel",
110 .type = CPUTIMER_INTR_VKERNEL,
111 .prio = CPUTIMER_INTR_PRIO_VKERNEL,
112 .caps = CPUTIMER_INTR_CAP_NONE
113};
114
115/*
116 * Initialize the systimer subsystem, called from MI code in early boot.
117 */
118static void
119cpu_initclocks(void *arg __unused)
120{
121 size_t len;
122
123 kprintf("initclocks\n");
124 len = sizeof(vkernel_cputimer.freq);
125 if (sysctlbyname("kern.cputimer.freq", &vkernel_cputimer.freq, &len,
126 NULL, 0) < 0) {
127 panic("cpu_initclocks: can't get kern.cputimer.freq!");
128 }
c157ff7a 129 len = NELEM(cputimer_mib);
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130 if (sysctlnametomib("kern.cputimer.clock", cputimer_mib, &len) < 0)
131 panic("cpu_initclocks: can't get kern.cputimer.clock!");
132 cputimer_miblen = len;
133
134 cputimer_intr_register(&vkernel_cputimer_intr);
135 cputimer_intr_select(&vkernel_cputimer_intr, 0);
136
137 cputimer_register(&vkernel_cputimer);
138 cputimer_select(&vkernel_cputimer, 0);
139}
140SYSINIT(clocksvk, SI_BOOT2_CLOCKREG, SI_ORDER_FIRST, cpu_initclocks, NULL)
141
142/*
143 * Constructor to initialize timer->base and get an initial count.
144 */
145static void
146vkernel_timer_construct(struct cputimer *timer, sysclock_t oclock)
147{
148 timer->base = 0;
149 timer->base = oclock - vkernel_timer_get_timecount();
150}
151
152/*
153 * Get the current counter, with 2's complement rollover.
154 *
155 * NOTE! MPSAFE, possibly no critical section
156 */
157static sysclock_t
158vkernel_timer_get_timecount(void)
159{
160 sysclock_t counter;
161 size_t len;
162
163 len = sizeof(counter);
164 if (sysctl(cputimer_mib, cputimer_miblen, &counter, &len,
165 NULL, 0) < 0) {
166 panic("vkernel_timer_get_timecount: sysctl failed!");
167 }
168 return(counter);
169}
170
171/*
172 * Initialize the interrupt for our core systimer. Use the kqueue timer
173 * support functions.
174 */
175static void
176vktimer_intr_initclock(struct cputimer_intr *cti __unused,
177 boolean_t selected __unused)
178{
179 KKASSERT(kqueue_timer_info == NULL);
180 kqueue_timer_info = kqueue_add_timer(vktimer_intr, NULL);
181}
182
183/*
184 * Reload the interrupt for our core systimer. Because the caller's
185 * reload calculation can be negatively indexed, we need a minimal
186 * check to ensure that a reasonable reload value is selected.
187 */
188static void
189vktimer_intr_reload(struct cputimer_intr *cti __unused, sysclock_t reload)
190{
191 if (kqueue_timer_info) {
192 if ((int)reload < 1)
193 reload = 1;
194 kqueue_reload_timer(kqueue_timer_info, (reload + 999) / 1000);
195 }
196}
197
198/*
199 * clock interrupt.
200 *
201 * NOTE: frame is a struct intrframe pointer.
202 */
203static void
204vktimer_intr(void *dummy, struct intrframe *frame)
205{
206 static sysclock_t sysclock_count;
207 struct globaldata *gd = mycpu;
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208 struct globaldata *gscan;
209 int n;
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210
211 sysclock_count = sys_cputimer->count();
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212 for (n = 0; n < ncpus; ++n) {
213 gscan = globaldata_find(n);
214 if (TAILQ_FIRST(&gscan->gd_systimerq) == NULL)
215 continue;
216 if (gscan != gd) {
217 lwkt_send_ipiq3(gscan, (ipifunc3_t)systimer_intr,
218 &sysclock_count, 0);
219 } else {
220 systimer_intr(&sysclock_count, 0, frame);
221 }
222 }
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223}
224
225/*
226 * Initialize the time of day register, based on the time base which is, e.g.
227 * from a filesystem.
228 */
229void
230inittodr(time_t base)
231{
232 struct timespec ts;
233 struct timeval tv;
234
235 gettimeofday(&tv, NULL);
236 ts.tv_sec = tv.tv_sec;
237 ts.tv_nsec = tv.tv_usec * 1000;
238 set_timeofday(&ts);
239}
240
241/*
242 * Write system time back to the RTC
243 */
244void
245resettodr(void)
246{
247}
248
249/*
250 * We need to enter a critical section to prevent signals from recursing
251 * into pthreads.
252 */
253void
254DELAY(int usec)
255{
256 crit_enter();
257 usleep(usec);
258 crit_exit();
259}
260
261void
262DRIVERSLEEP(int usec)
263{
264 if (mycpu->gd_intr_nesting_level)
265 DELAY(usec);
266 else if (1000000 / usec >= hz)
267 tsleep(DRIVERSLEEP, 0, "DELAY", 1000000 / usec / hz + 1);
268 else
269 DELAY(usec);
270}