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 SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 70 CTLFLAG_RD, &wall_cmos_clock, 0, ""); 71 72 static struct kqueue_info *kqueue_timer_info; 73 74 static int cputimer_mib[16]; 75 static int cputimer_miblen; 76 77 /* 78 * SYSTIMER IMPLEMENTATION 79 */ 80 static sysclock_t vkernel_timer_get_timecount(void); 81 static void vkernel_timer_construct(struct cputimer *timer, sysclock_t oclock); 82 83 static 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 97 static void vktimer_intr_reload(struct cputimer_intr *, sysclock_t); 98 static void vktimer_intr_initclock(struct cputimer_intr *, boolean_t); 99 100 static 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 */ 118 static void 119 cpu_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 } 129 len = NELEM(cputimer_mib); 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 } 140 SYSINIT(clocksvk, SI_BOOT2_CLOCKREG, SI_ORDER_FIRST, cpu_initclocks, NULL) 141 142 /* 143 * Constructor to initialize timer->base and get an initial count. 144 */ 145 static void 146 vkernel_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 */ 157 static sysclock_t 158 vkernel_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 */ 175 static void 176 vktimer_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 */ 188 static void 189 vktimer_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 */ 203 static void 204 vktimer_intr(void *dummy, struct intrframe *frame) 205 { 206 static sysclock_t sysclock_count; 207 struct globaldata *gd = mycpu; 208 struct globaldata *gscan; 209 int n; 210 211 sysclock_count = sys_cputimer->count(); 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 } 224 225 /* 226 * Initialize the time of day register, based on the time base which is, e.g. 227 * from a filesystem. 228 */ 229 void 230 inittodr(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 */ 244 void 245 resettodr(void) 246 { 247 } 248 249 /* 250 * We need to enter a critical section to prevent signals from recursing 251 * into pthreads. 252 */ 253 void 254 DELAY(int usec) 255 { 256 crit_enter(); 257 usleep(usec); 258 crit_exit(); 259 } 260 261 void 262 DRIVERSLEEP(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 } 271