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 * 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 57 static void vktimer_intr(void *dummy, struct intrframe *frame); 58 59 int disable_rtc_set; 60 SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 61 CTLFLAG_RW, &disable_rtc_set, 0, ""); 62 SYSCTL_INT(_hw, OID_AUTO, tsc_present, CTLFLAG_RD, 63 &tsc_present, 0, "TSC Available"); 64 SYSCTL_QUAD(_hw, OID_AUTO, tsc_frequency, CTLFLAG_RD, 65 &tsc_frequency, 0, "TSC Frequency"); 66 67 int adjkerntz; 68 int wall_cmos_clock = 0; 69 static struct kqueue_info *kqueue_timer_info; 70 71 static int cputimer_mib[16]; 72 static int cputimer_miblen; 73 74 /* 75 * SYSTIMER IMPLEMENTATION 76 */ 77 static sysclock_t vkernel_timer_get_timecount(void); 78 static void vkernel_timer_construct(struct cputimer *timer, sysclock_t oclock); 79 80 static 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 94 static void vktimer_intr_reload(struct cputimer_intr *, sysclock_t); 95 static void vktimer_intr_initclock(struct cputimer_intr *, boolean_t); 96 97 static 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 */ 115 static void 116 cpu_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 } 126 len = NELEM(cputimer_mib); 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 } 137 SYSINIT(clocksvk, SI_BOOT2_CLOCKREG, SI_ORDER_FIRST, cpu_initclocks, NULL) 138 139 /* 140 * Constructor to initialize timer->base and get an initial count. 141 */ 142 static void 143 vkernel_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 */ 154 static sysclock_t 155 vkernel_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 */ 172 static void 173 vktimer_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 */ 185 static void 186 vktimer_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 */ 200 static void 201 vktimer_intr(void *dummy, struct intrframe *frame) 202 { 203 static sysclock_t sysclock_count; 204 struct globaldata *gd = mycpu; 205 #ifdef SMP 206 struct globaldata *gscan; 207 int n; 208 #endif 209 210 sysclock_count = sys_cputimer->count(); 211 #ifdef SMP 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 } 223 #else 224 if (TAILQ_FIRST(&gd->gd_systimerq) != NULL) 225 systimer_intr(&sysclock_count, 0, frame); 226 #endif 227 } 228 229 /* 230 * Initialize the time of day register, based on the time base which is, e.g. 231 * from a filesystem. 232 */ 233 void 234 inittodr(time_t base) 235 { 236 struct timespec ts; 237 struct timeval tv; 238 239 gettimeofday(&tv, NULL); 240 ts.tv_sec = tv.tv_sec; 241 ts.tv_nsec = tv.tv_usec * 1000; 242 set_timeofday(&ts); 243 } 244 245 /* 246 * Write system time back to the RTC 247 */ 248 void 249 resettodr(void) 250 { 251 } 252 253 /* 254 * We need to enter a critical section to prevent signals from recursing 255 * into pthreads. 256 */ 257 void 258 DELAY(int usec) 259 { 260 crit_enter(); 261 usleep(usec); 262 crit_exit(); 263 } 264 265 void 266 DRIVERSLEEP(int usec) 267 { 268 if (mycpu->gd_intr_nesting_level) 269 DELAY(usec); 270 else if (1000000 / usec >= hz) 271 tsleep(DRIVERSLEEP, 0, "DELAY", 1000000 / usec / hz + 1); 272 else 273 DELAY(usec); 274 } 275