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_INT(_hw, OID_AUTO, tsc_invariant, CTLFLAG_RD, 65 &tsc_invariant, 0, "Invariant TSC"); 66 SYSCTL_INT(_hw, OID_AUTO, tsc_mpsync, CTLFLAG_RD, 67 &tsc_mpsync, 0, "TSC is synchronized across CPUs"); 68 SYSCTL_QUAD(_hw, OID_AUTO, tsc_frequency, CTLFLAG_RD, 69 &tsc_frequency, 0, "TSC Frequency"); 70 71 int adjkerntz; 72 int wall_cmos_clock = 0; 73 SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 74 CTLFLAG_RD, &wall_cmos_clock, 0, ""); 75 76 static struct kqueue_info *kqueue_timer_info; 77 78 static int cputimer_mib[16]; 79 static int cputimer_miblen; 80 81 /* 82 * SYSTIMER IMPLEMENTATION 83 */ 84 static sysclock_t vkernel_timer_get_timecount(void); 85 static void vkernel_timer_construct(struct cputimer *timer, sysclock_t oclock); 86 87 static struct cputimer vkernel_cputimer = { 88 SLIST_ENTRY_INITIALIZER, 89 "VKERNEL", 90 CPUTIMER_PRI_VKERNEL, 91 CPUTIMER_VKERNEL, 92 vkernel_timer_get_timecount, 93 cputimer_default_fromhz, 94 cputimer_default_fromus, 95 vkernel_timer_construct, 96 cputimer_default_destruct, 97 VKTIMER_FREQ, 98 0, 0, 0 99 }; 100 101 static void vktimer_intr_reload(struct cputimer_intr *, sysclock_t); 102 static void vktimer_intr_initclock(struct cputimer_intr *, boolean_t); 103 104 static struct cputimer_intr vkernel_cputimer_intr = { 105 .freq = VKTIMER_FREQ, 106 .reload = vktimer_intr_reload, 107 .enable = cputimer_intr_default_enable, 108 .config = cputimer_intr_default_config, 109 .restart = cputimer_intr_default_restart, 110 .pmfixup = cputimer_intr_default_pmfixup, 111 .initclock = vktimer_intr_initclock, 112 .next = SLIST_ENTRY_INITIALIZER, 113 .name = "vkernel", 114 .type = CPUTIMER_INTR_VKERNEL, 115 .prio = CPUTIMER_INTR_PRIO_VKERNEL, 116 .caps = CPUTIMER_INTR_CAP_NONE 117 }; 118 119 /* 120 * Initialize the systimer subsystem, called from MI code in early boot. 121 */ 122 static void 123 cpu_initclocks(void *arg __unused) 124 { 125 size_t len; 126 127 kprintf("initclocks\n"); 128 len = sizeof(vkernel_cputimer.freq); 129 if (sysctlbyname("kern.cputimer.freq", &vkernel_cputimer.freq, &len, 130 NULL, 0) < 0) { 131 panic("cpu_initclocks: can't get kern.cputimer.freq!"); 132 } 133 len = NELEM(cputimer_mib); 134 if (sysctlnametomib("kern.cputimer.clock", cputimer_mib, &len) < 0) 135 panic("cpu_initclocks: can't get kern.cputimer.clock!"); 136 cputimer_miblen = len; 137 138 cputimer_intr_register(&vkernel_cputimer_intr); 139 cputimer_intr_select(&vkernel_cputimer_intr, 0); 140 141 cputimer_register(&vkernel_cputimer); 142 cputimer_select(&vkernel_cputimer, 0); 143 } 144 SYSINIT(clocksvk, SI_BOOT2_CLOCKREG, SI_ORDER_FIRST, cpu_initclocks, NULL); 145 146 /* 147 * Constructor to initialize timer->base and get an initial count. 148 */ 149 static void 150 vkernel_timer_construct(struct cputimer *timer, sysclock_t oclock) 151 { 152 timer->base = 0; 153 timer->base = oclock - vkernel_timer_get_timecount(); 154 } 155 156 /* 157 * Get the current counter, with 2's complement rollover. 158 * 159 * NOTE! MPSAFE, possibly no critical section 160 */ 161 static sysclock_t 162 vkernel_timer_get_timecount(void) 163 { 164 sysclock_t counter; 165 size_t len; 166 167 len = sizeof(counter); 168 if (sysctl(cputimer_mib, cputimer_miblen, &counter, &len, 169 NULL, 0) < 0) { 170 panic("vkernel_timer_get_timecount: sysctl failed!"); 171 } 172 return(counter); 173 } 174 175 /* 176 * Initialize the interrupt for our core systimer. Use the kqueue timer 177 * support functions. 178 */ 179 static void 180 vktimer_intr_initclock(struct cputimer_intr *cti __unused, 181 boolean_t selected __unused) 182 { 183 KKASSERT(kqueue_timer_info == NULL); 184 kqueue_timer_info = kqueue_add_timer(vktimer_intr, NULL); 185 } 186 187 /* 188 * Reload the interrupt for our core systimer. Because the caller's 189 * reload calculation can be negatively indexed, we need a minimal 190 * check to ensure that a reasonable reload value is selected. 191 */ 192 static void 193 vktimer_intr_reload(struct cputimer_intr *cti __unused, sysclock_t reload) 194 { 195 if (kqueue_timer_info) { 196 if ((int)reload < 1) 197 reload = 1; 198 kqueue_reload_timer(kqueue_timer_info, (reload + 999) / 1000); 199 } 200 } 201 202 /* 203 * clock interrupt. 204 * 205 * NOTE: frame is a struct intrframe pointer. 206 */ 207 static void 208 vktimer_intr(void *dummy, struct intrframe *frame) 209 { 210 static sysclock_t sysclock_count; 211 struct globaldata *gd = mycpu; 212 struct globaldata *gscan; 213 int n; 214 215 sysclock_count = sys_cputimer->count(); 216 for (n = 0; n < ncpus; ++n) { 217 gscan = globaldata_find(n); 218 if (TAILQ_FIRST(&gscan->gd_systimerq) == NULL) 219 continue; 220 if (gscan != gd) { 221 lwkt_send_ipiq3(gscan, (ipifunc3_t)systimer_intr, 222 &sysclock_count, 0); 223 } else { 224 systimer_intr(&sysclock_count, 0, frame); 225 } 226 } 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