kernel: Make SMP support default (and non-optional).
[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;
69static struct kqueue_info *kqueue_timer_info;
70
71static int cputimer_mib[16];
72static int cputimer_miblen;
73
74/*
75 * SYSTIMER IMPLEMENTATION
76 */
77static sysclock_t vkernel_timer_get_timecount(void);
78static void vkernel_timer_construct(struct cputimer *timer, sysclock_t oclock);
79
80static struct cputimer vkernel_cputimer = {
81 SLIST_ENTRY_INITIALIZER,
82 "VKERNEL",
83 CPUTIMER_PRI_VKERNEL,
84 CPUTIMER_VKERNEL,
85 vkernel_timer_get_timecount,
86 cputimer_default_fromhz,
87 cputimer_default_fromus,
88 vkernel_timer_construct,
89 cputimer_default_destruct,
90 VKTIMER_FREQ,
91 0, 0, 0
92};
93
94static void vktimer_intr_reload(struct cputimer_intr *, sysclock_t);
95static void vktimer_intr_initclock(struct cputimer_intr *, boolean_t);
96
97static struct cputimer_intr vkernel_cputimer_intr = {
98 .freq = VKTIMER_FREQ,
99 .reload = vktimer_intr_reload,
100 .enable = cputimer_intr_default_enable,
101 .config = cputimer_intr_default_config,
102 .restart = cputimer_intr_default_restart,
103 .pmfixup = cputimer_intr_default_pmfixup,
104 .initclock = vktimer_intr_initclock,
105 .next = SLIST_ENTRY_INITIALIZER,
106 .name = "vkernel",
107 .type = CPUTIMER_INTR_VKERNEL,
108 .prio = CPUTIMER_INTR_PRIO_VKERNEL,
109 .caps = CPUTIMER_INTR_CAP_NONE
110};
111
112/*
113 * Initialize the systimer subsystem, called from MI code in early boot.
114 */
115static void
116cpu_initclocks(void *arg __unused)
117{
118 size_t len;
119
120 kprintf("initclocks\n");
121 len = sizeof(vkernel_cputimer.freq);
122 if (sysctlbyname("kern.cputimer.freq", &vkernel_cputimer.freq, &len,
123 NULL, 0) < 0) {
124 panic("cpu_initclocks: can't get kern.cputimer.freq!");
125 }
c157ff7a 126 len = NELEM(cputimer_mib);
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127 if (sysctlnametomib("kern.cputimer.clock", cputimer_mib, &len) < 0)
128 panic("cpu_initclocks: can't get kern.cputimer.clock!");
129 cputimer_miblen = len;
130
131 cputimer_intr_register(&vkernel_cputimer_intr);
132 cputimer_intr_select(&vkernel_cputimer_intr, 0);
133
134 cputimer_register(&vkernel_cputimer);
135 cputimer_select(&vkernel_cputimer, 0);
136}
137SYSINIT(clocksvk, SI_BOOT2_CLOCKREG, SI_ORDER_FIRST, cpu_initclocks, NULL)
138
139/*
140 * Constructor to initialize timer->base and get an initial count.
141 */
142static void
143vkernel_timer_construct(struct cputimer *timer, sysclock_t oclock)
144{
145 timer->base = 0;
146 timer->base = oclock - vkernel_timer_get_timecount();
147}
148
149/*
150 * Get the current counter, with 2's complement rollover.
151 *
152 * NOTE! MPSAFE, possibly no critical section
153 */
154static sysclock_t
155vkernel_timer_get_timecount(void)
156{
157 sysclock_t counter;
158 size_t len;
159
160 len = sizeof(counter);
161 if (sysctl(cputimer_mib, cputimer_miblen, &counter, &len,
162 NULL, 0) < 0) {
163 panic("vkernel_timer_get_timecount: sysctl failed!");
164 }
165 return(counter);
166}
167
168/*
169 * Initialize the interrupt for our core systimer. Use the kqueue timer
170 * support functions.
171 */
172static void
173vktimer_intr_initclock(struct cputimer_intr *cti __unused,
174 boolean_t selected __unused)
175{
176 KKASSERT(kqueue_timer_info == NULL);
177 kqueue_timer_info = kqueue_add_timer(vktimer_intr, NULL);
178}
179
180/*
181 * Reload the interrupt for our core systimer. Because the caller's
182 * reload calculation can be negatively indexed, we need a minimal
183 * check to ensure that a reasonable reload value is selected.
184 */
185static void
186vktimer_intr_reload(struct cputimer_intr *cti __unused, sysclock_t reload)
187{
188 if (kqueue_timer_info) {
189 if ((int)reload < 1)
190 reload = 1;
191 kqueue_reload_timer(kqueue_timer_info, (reload + 999) / 1000);
192 }
193}
194
195/*
196 * clock interrupt.
197 *
198 * NOTE: frame is a struct intrframe pointer.
199 */
200static void
201vktimer_intr(void *dummy, struct intrframe *frame)
202{
203 static sysclock_t sysclock_count;
204 struct globaldata *gd = mycpu;
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205 struct globaldata *gscan;
206 int n;
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207
208 sysclock_count = sys_cputimer->count();
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209 for (n = 0; n < ncpus; ++n) {
210 gscan = globaldata_find(n);
211 if (TAILQ_FIRST(&gscan->gd_systimerq) == NULL)
212 continue;
213 if (gscan != gd) {
214 lwkt_send_ipiq3(gscan, (ipifunc3_t)systimer_intr,
215 &sysclock_count, 0);
216 } else {
217 systimer_intr(&sysclock_count, 0, frame);
218 }
219 }
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220}
221
222/*
223 * Initialize the time of day register, based on the time base which is, e.g.
224 * from a filesystem.
225 */
226void
227inittodr(time_t base)
228{
229 struct timespec ts;
230 struct timeval tv;
231
232 gettimeofday(&tv, NULL);
233 ts.tv_sec = tv.tv_sec;
234 ts.tv_nsec = tv.tv_usec * 1000;
235 set_timeofday(&ts);
236}
237
238/*
239 * Write system time back to the RTC
240 */
241void
242resettodr(void)
243{
244}
245
246/*
247 * We need to enter a critical section to prevent signals from recursing
248 * into pthreads.
249 */
250void
251DELAY(int usec)
252{
253 crit_enter();
254 usleep(usec);
255 crit_exit();
256}
257
258void
259DRIVERSLEEP(int usec)
260{
261 if (mycpu->gd_intr_nesting_level)
262 DELAY(usec);
263 else if (1000000 / usec >= hz)
264 tsleep(DRIVERSLEEP, 0, "DELAY", 1000000 / usec / hz + 1);
265 else
266 DELAY(usec);
267}