David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame^] | 1 | /* |
| 2 | * QEMU System Emulator |
| 3 | * |
| 4 | * Copyright (c) 2003-2008 Fabrice Bellard |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 7 | * of this software and associated documentation files (the "Software"), to deal |
| 8 | * in the Software without restriction, including without limitation the rights |
| 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 10 | * copies of the Software, and to permit persons to whom the Software is |
| 11 | * furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in |
| 14 | * all copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 22 | * THE SOFTWARE. |
| 23 | */ |
| 24 | |
| 25 | #include "sysemu.h" |
| 26 | #include "net.h" |
| 27 | #include "monitor.h" |
| 28 | #include "console.h" |
| 29 | |
| 30 | #include "hw/hw.h" |
| 31 | |
| 32 | #include <unistd.h> |
| 33 | #include <fcntl.h> |
| 34 | #include <time.h> |
| 35 | #include <errno.h> |
| 36 | #include <sys/time.h> |
| 37 | #include <signal.h> |
| 38 | #ifdef __FreeBSD__ |
| 39 | #include <sys/param.h> |
| 40 | #endif |
| 41 | |
| 42 | #ifdef __linux__ |
| 43 | #include <sys/ioctl.h> |
| 44 | #include <linux/rtc.h> |
| 45 | /* For the benefit of older linux systems which don't supply it, |
| 46 | we use a local copy of hpet.h. */ |
| 47 | /* #include <linux/hpet.h> */ |
| 48 | #include "hpet.h" |
| 49 | #endif |
| 50 | |
| 51 | #ifdef _WIN32 |
| 52 | #include <windows.h> |
| 53 | #include <mmsystem.h> |
| 54 | #endif |
| 55 | |
| 56 | #include "qemu-timer.h" |
| 57 | |
| 58 | /* Conversion factor from emulated instructions to virtual clock ticks. */ |
| 59 | int icount_time_shift; |
| 60 | /* Arbitrarily pick 1MIPS as the minimum allowable speed. */ |
| 61 | #define MAX_ICOUNT_SHIFT 10 |
| 62 | /* Compensate for varying guest execution speed. */ |
| 63 | int64_t qemu_icount_bias; |
| 64 | static QEMUTimer *icount_rt_timer; |
| 65 | static QEMUTimer *icount_vm_timer; |
| 66 | |
| 67 | |
| 68 | /***********************************************************/ |
| 69 | /* real time host monotonic timer */ |
| 70 | |
| 71 | |
| 72 | static int64_t get_clock_realtime(void) |
| 73 | { |
| 74 | struct timeval tv; |
| 75 | |
| 76 | gettimeofday(&tv, NULL); |
| 77 | return tv.tv_sec * 1000000000LL + (tv.tv_usec * 1000); |
| 78 | } |
| 79 | |
| 80 | #ifdef WIN32 |
| 81 | |
| 82 | static int64_t clock_freq; |
| 83 | |
| 84 | static void init_get_clock(void) |
| 85 | { |
| 86 | LARGE_INTEGER freq; |
| 87 | int ret; |
| 88 | ret = QueryPerformanceFrequency(&freq); |
| 89 | if (ret == 0) { |
| 90 | fprintf(stderr, "Could not calibrate ticks\n"); |
| 91 | exit(1); |
| 92 | } |
| 93 | clock_freq = freq.QuadPart; |
| 94 | } |
| 95 | |
| 96 | static int64_t get_clock(void) |
| 97 | { |
| 98 | LARGE_INTEGER ti; |
| 99 | QueryPerformanceCounter(&ti); |
| 100 | return muldiv64(ti.QuadPart, get_ticks_per_sec(), clock_freq); |
| 101 | } |
| 102 | |
| 103 | #else |
| 104 | |
| 105 | static int use_rt_clock; |
| 106 | |
| 107 | static void init_get_clock(void) |
| 108 | { |
| 109 | use_rt_clock = 0; |
| 110 | #if defined(__linux__) || (defined(__FreeBSD__) && __FreeBSD_version >= 500000) \ |
| 111 | || defined(__DragonFly__) || defined(__FreeBSD_kernel__) |
| 112 | { |
| 113 | struct timespec ts; |
| 114 | if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) { |
| 115 | use_rt_clock = 1; |
| 116 | } |
| 117 | } |
| 118 | #endif |
| 119 | } |
| 120 | |
| 121 | static int64_t get_clock(void) |
| 122 | { |
| 123 | #if defined(__linux__) || (defined(__FreeBSD__) && __FreeBSD_version >= 500000) \ |
| 124 | || defined(__DragonFly__) || defined(__FreeBSD_kernel__) |
| 125 | if (use_rt_clock) { |
| 126 | struct timespec ts; |
| 127 | clock_gettime(CLOCK_MONOTONIC, &ts); |
| 128 | return ts.tv_sec * 1000000000LL + ts.tv_nsec; |
| 129 | } else |
| 130 | #endif |
| 131 | { |
| 132 | /* XXX: using gettimeofday leads to problems if the date |
| 133 | changes, so it should be avoided. */ |
| 134 | return get_clock_realtime(); |
| 135 | } |
| 136 | } |
| 137 | #endif |
| 138 | |
| 139 | /***********************************************************/ |
| 140 | /* guest cycle counter */ |
| 141 | |
| 142 | typedef struct TimersState { |
| 143 | int64_t cpu_ticks_prev; |
| 144 | int64_t cpu_ticks_offset; |
| 145 | int64_t cpu_clock_offset; |
| 146 | int32_t cpu_ticks_enabled; |
| 147 | int64_t dummy; |
| 148 | } TimersState; |
| 149 | |
| 150 | static void timer_save(QEMUFile *f, void *opaque) |
| 151 | { |
| 152 | TimersState *s = opaque; |
| 153 | |
| 154 | if (s->cpu_ticks_enabled) { |
| 155 | hw_error("cannot save state if virtual timers are running"); |
| 156 | } |
| 157 | qemu_put_be64(f, s->cpu_ticks_prev); |
| 158 | qemu_put_be64(f, s->cpu_ticks_offset); |
| 159 | qemu_put_be64(f, s->cpu_clock_offset); |
| 160 | } |
| 161 | |
| 162 | static int timer_load(QEMUFile *f, void *opaque, int version_id) |
| 163 | { |
| 164 | TimersState *s = opaque; |
| 165 | |
| 166 | if (version_id != 1 && version_id != 2) |
| 167 | return -EINVAL; |
| 168 | if (s->cpu_ticks_enabled) { |
| 169 | return -EINVAL; |
| 170 | } |
| 171 | s->cpu_ticks_prev = qemu_get_sbe64(f); |
| 172 | s->cpu_ticks_offset = qemu_get_sbe64(f); |
| 173 | if (version_id == 2) { |
| 174 | s->cpu_clock_offset = qemu_get_sbe64(f); |
| 175 | } |
| 176 | return 0; |
| 177 | } |
| 178 | |
| 179 | |
| 180 | TimersState timers_state; |
| 181 | |
| 182 | /* return the host CPU cycle counter and handle stop/restart */ |
| 183 | int64_t cpu_get_ticks(void) |
| 184 | { |
| 185 | if (use_icount) { |
| 186 | return cpu_get_icount(); |
| 187 | } |
| 188 | if (!timers_state.cpu_ticks_enabled) { |
| 189 | return timers_state.cpu_ticks_offset; |
| 190 | } else { |
| 191 | int64_t ticks; |
| 192 | ticks = cpu_get_real_ticks(); |
| 193 | if (timers_state.cpu_ticks_prev > ticks) { |
| 194 | /* Note: non increasing ticks may happen if the host uses |
| 195 | software suspend */ |
| 196 | timers_state.cpu_ticks_offset += timers_state.cpu_ticks_prev - ticks; |
| 197 | } |
| 198 | timers_state.cpu_ticks_prev = ticks; |
| 199 | return ticks + timers_state.cpu_ticks_offset; |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | /* return the host CPU monotonic timer and handle stop/restart */ |
| 204 | static int64_t cpu_get_clock(void) |
| 205 | { |
| 206 | int64_t ti; |
| 207 | if (!timers_state.cpu_ticks_enabled) { |
| 208 | return timers_state.cpu_clock_offset; |
| 209 | } else { |
| 210 | ti = get_clock(); |
| 211 | return ti + timers_state.cpu_clock_offset; |
| 212 | } |
| 213 | } |
| 214 | |
| 215 | #ifndef CONFIG_IOTHREAD |
| 216 | static int64_t qemu_icount_delta(void) |
| 217 | { |
| 218 | if (!use_icount) { |
| 219 | return 5000 * (int64_t) 1000000; |
| 220 | } else if (use_icount == 1) { |
| 221 | /* When not using an adaptive execution frequency |
| 222 | we tend to get badly out of sync with real time, |
| 223 | so just delay for a reasonable amount of time. */ |
| 224 | return 0; |
| 225 | } else { |
| 226 | return cpu_get_icount() - cpu_get_clock(); |
| 227 | } |
| 228 | } |
| 229 | #endif |
| 230 | |
| 231 | /* enable cpu_get_ticks() */ |
| 232 | void cpu_enable_ticks(void) |
| 233 | { |
| 234 | if (!timers_state.cpu_ticks_enabled) { |
| 235 | timers_state.cpu_ticks_offset -= cpu_get_real_ticks(); |
| 236 | timers_state.cpu_clock_offset -= get_clock(); |
| 237 | timers_state.cpu_ticks_enabled = 1; |
| 238 | } |
| 239 | } |
| 240 | |
| 241 | /* disable cpu_get_ticks() : the clock is stopped. You must not call |
| 242 | cpu_get_ticks() after that. */ |
| 243 | void cpu_disable_ticks(void) |
| 244 | { |
| 245 | if (timers_state.cpu_ticks_enabled) { |
| 246 | timers_state.cpu_ticks_offset = cpu_get_ticks(); |
| 247 | timers_state.cpu_clock_offset = cpu_get_clock(); |
| 248 | timers_state.cpu_ticks_enabled = 0; |
| 249 | } |
| 250 | } |
| 251 | |
| 252 | /***********************************************************/ |
| 253 | /* timers */ |
| 254 | |
| 255 | #define QEMU_CLOCK_REALTIME 0 |
| 256 | #define QEMU_CLOCK_VIRTUAL 1 |
| 257 | #define QEMU_CLOCK_HOST 2 |
| 258 | |
| 259 | struct QEMUClock { |
| 260 | int type; |
| 261 | int enabled; |
| 262 | /* XXX: add frequency */ |
| 263 | }; |
| 264 | |
| 265 | struct QEMUTimer { |
| 266 | QEMUClock *clock; |
| 267 | int64_t expire_time; |
| 268 | QEMUTimerCB *cb; |
| 269 | void *opaque; |
| 270 | struct QEMUTimer *next; |
| 271 | }; |
| 272 | |
| 273 | struct qemu_alarm_timer { |
| 274 | char const *name; |
| 275 | int (*start)(struct qemu_alarm_timer *t); |
| 276 | void (*stop)(struct qemu_alarm_timer *t); |
| 277 | void (*rearm)(struct qemu_alarm_timer *t); |
| 278 | void *priv; |
| 279 | |
| 280 | char expired; |
| 281 | char pending; |
| 282 | }; |
| 283 | |
| 284 | static struct qemu_alarm_timer *alarm_timer; |
| 285 | |
| 286 | int qemu_alarm_pending(void) |
| 287 | { |
| 288 | return alarm_timer->pending; |
| 289 | } |
| 290 | |
| 291 | static inline int alarm_has_dynticks(struct qemu_alarm_timer *t) |
| 292 | { |
| 293 | return !!t->rearm; |
| 294 | } |
| 295 | |
| 296 | static void qemu_rearm_alarm_timer(struct qemu_alarm_timer *t) |
| 297 | { |
| 298 | if (!alarm_has_dynticks(t)) |
| 299 | return; |
| 300 | |
| 301 | t->rearm(t); |
| 302 | } |
| 303 | |
| 304 | /* TODO: MIN_TIMER_REARM_US should be optimized */ |
| 305 | #define MIN_TIMER_REARM_US 250 |
| 306 | |
| 307 | #ifdef _WIN32 |
| 308 | |
| 309 | struct qemu_alarm_win32 { |
| 310 | MMRESULT timerId; |
| 311 | unsigned int period; |
| 312 | } alarm_win32_data = {0, 0}; |
| 313 | |
| 314 | static int win32_start_timer(struct qemu_alarm_timer *t); |
| 315 | static void win32_stop_timer(struct qemu_alarm_timer *t); |
| 316 | static void win32_rearm_timer(struct qemu_alarm_timer *t); |
| 317 | |
| 318 | #else |
| 319 | |
| 320 | static int unix_start_timer(struct qemu_alarm_timer *t); |
| 321 | static void unix_stop_timer(struct qemu_alarm_timer *t); |
| 322 | |
| 323 | #ifdef __linux__ |
| 324 | |
| 325 | static int dynticks_start_timer(struct qemu_alarm_timer *t); |
| 326 | static void dynticks_stop_timer(struct qemu_alarm_timer *t); |
| 327 | static void dynticks_rearm_timer(struct qemu_alarm_timer *t); |
| 328 | |
| 329 | static int hpet_start_timer(struct qemu_alarm_timer *t); |
| 330 | static void hpet_stop_timer(struct qemu_alarm_timer *t); |
| 331 | |
| 332 | static int rtc_start_timer(struct qemu_alarm_timer *t); |
| 333 | static void rtc_stop_timer(struct qemu_alarm_timer *t); |
| 334 | |
| 335 | #endif /* __linux__ */ |
| 336 | |
| 337 | #endif /* _WIN32 */ |
| 338 | |
| 339 | /* Correlation between real and virtual time is always going to be |
| 340 | fairly approximate, so ignore small variation. |
| 341 | When the guest is idle real and virtual time will be aligned in |
| 342 | the IO wait loop. */ |
| 343 | #define ICOUNT_WOBBLE (get_ticks_per_sec() / 10) |
| 344 | |
| 345 | static void icount_adjust(void) |
| 346 | { |
| 347 | int64_t cur_time; |
| 348 | int64_t cur_icount; |
| 349 | int64_t delta; |
| 350 | static int64_t last_delta; |
| 351 | /* If the VM is not running, then do nothing. */ |
| 352 | if (!vm_running) |
| 353 | return; |
| 354 | |
| 355 | cur_time = cpu_get_clock(); |
| 356 | cur_icount = qemu_get_clock(vm_clock); |
| 357 | delta = cur_icount - cur_time; |
| 358 | /* FIXME: This is a very crude algorithm, somewhat prone to oscillation. */ |
| 359 | if (delta > 0 |
| 360 | && last_delta + ICOUNT_WOBBLE < delta * 2 |
| 361 | && icount_time_shift > 0) { |
| 362 | /* The guest is getting too far ahead. Slow time down. */ |
| 363 | icount_time_shift--; |
| 364 | } |
| 365 | if (delta < 0 |
| 366 | && last_delta - ICOUNT_WOBBLE > delta * 2 |
| 367 | && icount_time_shift < MAX_ICOUNT_SHIFT) { |
| 368 | /* The guest is getting too far behind. Speed time up. */ |
| 369 | icount_time_shift++; |
| 370 | } |
| 371 | last_delta = delta; |
| 372 | qemu_icount_bias = cur_icount - (qemu_icount << icount_time_shift); |
| 373 | } |
| 374 | |
| 375 | static void icount_adjust_rt(void * opaque) |
| 376 | { |
| 377 | qemu_mod_timer(icount_rt_timer, |
| 378 | qemu_get_clock(rt_clock) + 1000); |
| 379 | icount_adjust(); |
| 380 | } |
| 381 | |
| 382 | static void icount_adjust_vm(void * opaque) |
| 383 | { |
| 384 | qemu_mod_timer(icount_vm_timer, |
| 385 | qemu_get_clock(vm_clock) + get_ticks_per_sec() / 10); |
| 386 | icount_adjust(); |
| 387 | } |
| 388 | |
| 389 | int64_t qemu_icount_round(int64_t count) |
| 390 | { |
| 391 | return (count + (1 << icount_time_shift) - 1) >> icount_time_shift; |
| 392 | } |
| 393 | |
| 394 | static struct qemu_alarm_timer alarm_timers[] = { |
| 395 | #ifndef _WIN32 |
| 396 | #ifdef __linux__ |
| 397 | {"dynticks", dynticks_start_timer, |
| 398 | dynticks_stop_timer, dynticks_rearm_timer, NULL}, |
| 399 | /* HPET - if available - is preferred */ |
| 400 | {"hpet", hpet_start_timer, hpet_stop_timer, NULL, NULL}, |
| 401 | /* ...otherwise try RTC */ |
| 402 | {"rtc", rtc_start_timer, rtc_stop_timer, NULL, NULL}, |
| 403 | #endif |
| 404 | {"unix", unix_start_timer, unix_stop_timer, NULL, NULL}, |
| 405 | #else |
| 406 | {"dynticks", win32_start_timer, |
| 407 | win32_stop_timer, win32_rearm_timer, &alarm_win32_data}, |
| 408 | {"win32", win32_start_timer, |
| 409 | win32_stop_timer, NULL, &alarm_win32_data}, |
| 410 | #endif |
| 411 | {NULL, } |
| 412 | }; |
| 413 | |
| 414 | static void show_available_alarms(void) |
| 415 | { |
| 416 | int i; |
| 417 | |
| 418 | printf("Available alarm timers, in order of precedence:\n"); |
| 419 | for (i = 0; alarm_timers[i].name; i++) |
| 420 | printf("%s\n", alarm_timers[i].name); |
| 421 | } |
| 422 | |
| 423 | void configure_alarms(char const *opt) |
| 424 | { |
| 425 | int i; |
| 426 | int cur = 0; |
| 427 | int count = ARRAY_SIZE(alarm_timers) - 1; |
| 428 | char *arg; |
| 429 | char *name; |
| 430 | struct qemu_alarm_timer tmp; |
| 431 | |
| 432 | if (!strcmp(opt, "?")) { |
| 433 | show_available_alarms(); |
| 434 | exit(0); |
| 435 | } |
| 436 | |
| 437 | arg = qemu_strdup(opt); |
| 438 | |
| 439 | /* Reorder the array */ |
| 440 | name = strtok(arg, ","); |
| 441 | while (name) { |
| 442 | for (i = 0; i < count && alarm_timers[i].name; i++) { |
| 443 | if (!strcmp(alarm_timers[i].name, name)) |
| 444 | break; |
| 445 | } |
| 446 | |
| 447 | if (i == count) { |
| 448 | fprintf(stderr, "Unknown clock %s\n", name); |
| 449 | goto next; |
| 450 | } |
| 451 | |
| 452 | if (i < cur) |
| 453 | /* Ignore */ |
| 454 | goto next; |
| 455 | |
| 456 | /* Swap */ |
| 457 | tmp = alarm_timers[i]; |
| 458 | alarm_timers[i] = alarm_timers[cur]; |
| 459 | alarm_timers[cur] = tmp; |
| 460 | |
| 461 | cur++; |
| 462 | next: |
| 463 | name = strtok(NULL, ","); |
| 464 | } |
| 465 | |
| 466 | qemu_free(arg); |
| 467 | |
| 468 | if (cur) { |
| 469 | /* Disable remaining timers */ |
| 470 | for (i = cur; i < count; i++) |
| 471 | alarm_timers[i].name = NULL; |
| 472 | } else { |
| 473 | show_available_alarms(); |
| 474 | exit(1); |
| 475 | } |
| 476 | } |
| 477 | |
| 478 | #define QEMU_NUM_CLOCKS 3 |
| 479 | |
| 480 | QEMUClock *rt_clock; |
| 481 | QEMUClock *vm_clock; |
| 482 | QEMUClock *host_clock; |
| 483 | |
| 484 | static QEMUTimer *active_timers[QEMU_NUM_CLOCKS]; |
| 485 | |
| 486 | static QEMUClock *qemu_new_clock(int type) |
| 487 | { |
| 488 | QEMUClock *clock; |
| 489 | clock = qemu_mallocz(sizeof(QEMUClock)); |
| 490 | clock->type = type; |
| 491 | clock->enabled = 1; |
| 492 | return clock; |
| 493 | } |
| 494 | |
| 495 | void qemu_clock_enable(QEMUClock *clock, int enabled) |
| 496 | { |
| 497 | clock->enabled = enabled; |
| 498 | } |
| 499 | |
| 500 | QEMUTimer *qemu_new_timer(QEMUClock *clock, QEMUTimerCB *cb, void *opaque) |
| 501 | { |
| 502 | QEMUTimer *ts; |
| 503 | |
| 504 | ts = qemu_mallocz(sizeof(QEMUTimer)); |
| 505 | ts->clock = clock; |
| 506 | ts->cb = cb; |
| 507 | ts->opaque = opaque; |
| 508 | return ts; |
| 509 | } |
| 510 | |
| 511 | void qemu_free_timer(QEMUTimer *ts) |
| 512 | { |
| 513 | qemu_free(ts); |
| 514 | } |
| 515 | |
| 516 | /* stop a timer, but do not dealloc it */ |
| 517 | void qemu_del_timer(QEMUTimer *ts) |
| 518 | { |
| 519 | QEMUTimer **pt, *t; |
| 520 | |
| 521 | /* NOTE: this code must be signal safe because |
| 522 | qemu_timer_expired() can be called from a signal. */ |
| 523 | pt = &active_timers[ts->clock->type]; |
| 524 | for(;;) { |
| 525 | t = *pt; |
| 526 | if (!t) |
| 527 | break; |
| 528 | if (t == ts) { |
| 529 | *pt = t->next; |
| 530 | break; |
| 531 | } |
| 532 | pt = &t->next; |
| 533 | } |
| 534 | } |
| 535 | |
| 536 | /* modify the current timer so that it will be fired when current_time |
| 537 | >= expire_time. The corresponding callback will be called. */ |
| 538 | void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time) |
| 539 | { |
| 540 | QEMUTimer **pt, *t; |
| 541 | |
| 542 | qemu_del_timer(ts); |
| 543 | |
| 544 | /* add the timer in the sorted list */ |
| 545 | /* NOTE: this code must be signal safe because |
| 546 | qemu_timer_expired() can be called from a signal. */ |
| 547 | pt = &active_timers[ts->clock->type]; |
| 548 | for(;;) { |
| 549 | t = *pt; |
| 550 | if (!t) |
| 551 | break; |
| 552 | if (t->expire_time > expire_time) |
| 553 | break; |
| 554 | pt = &t->next; |
| 555 | } |
| 556 | ts->expire_time = expire_time; |
| 557 | ts->next = *pt; |
| 558 | *pt = ts; |
| 559 | |
| 560 | /* Rearm if necessary */ |
| 561 | if (pt == &active_timers[ts->clock->type]) { |
| 562 | if (!alarm_timer->pending) { |
| 563 | qemu_rearm_alarm_timer(alarm_timer); |
| 564 | } |
| 565 | /* Interrupt execution to force deadline recalculation. */ |
| 566 | if (use_icount) |
| 567 | qemu_notify_event(); |
| 568 | } |
| 569 | } |
| 570 | |
| 571 | int qemu_timer_pending(QEMUTimer *ts) |
| 572 | { |
| 573 | QEMUTimer *t; |
| 574 | for(t = active_timers[ts->clock->type]; t != NULL; t = t->next) { |
| 575 | if (t == ts) |
| 576 | return 1; |
| 577 | } |
| 578 | return 0; |
| 579 | } |
| 580 | |
| 581 | int qemu_timer_expired(QEMUTimer *timer_head, int64_t current_time) |
| 582 | { |
| 583 | if (!timer_head) |
| 584 | return 0; |
| 585 | return (timer_head->expire_time <= current_time); |
| 586 | } |
| 587 | |
| 588 | static void qemu_run_timers(QEMUClock *clock) |
| 589 | { |
| 590 | QEMUTimer **ptimer_head, *ts; |
| 591 | int64_t current_time; |
| 592 | |
| 593 | if (!clock->enabled) |
| 594 | return; |
| 595 | |
| 596 | current_time = qemu_get_clock (clock); |
| 597 | ptimer_head = &active_timers[clock->type]; |
| 598 | for(;;) { |
| 599 | ts = *ptimer_head; |
| 600 | if (!ts || ts->expire_time > current_time) |
| 601 | break; |
| 602 | /* remove timer from the list before calling the callback */ |
| 603 | *ptimer_head = ts->next; |
| 604 | ts->next = NULL; |
| 605 | |
| 606 | /* run the callback (the timer list can be modified) */ |
| 607 | ts->cb(ts->opaque); |
| 608 | } |
| 609 | } |
| 610 | |
| 611 | int64_t qemu_get_clock(QEMUClock *clock) |
| 612 | { |
| 613 | switch(clock->type) { |
| 614 | case QEMU_CLOCK_REALTIME: |
| 615 | return get_clock() / 1000000; |
| 616 | default: |
| 617 | case QEMU_CLOCK_VIRTUAL: |
| 618 | if (use_icount) { |
| 619 | return cpu_get_icount(); |
| 620 | } else { |
| 621 | return cpu_get_clock(); |
| 622 | } |
| 623 | case QEMU_CLOCK_HOST: |
| 624 | return get_clock_realtime(); |
| 625 | } |
| 626 | } |
| 627 | |
| 628 | int64_t qemu_get_clock_ns(QEMUClock *clock) |
| 629 | { |
| 630 | switch(clock->type) { |
| 631 | case QEMU_CLOCK_REALTIME: |
| 632 | return get_clock(); |
| 633 | default: |
| 634 | case QEMU_CLOCK_VIRTUAL: |
| 635 | if (use_icount) { |
| 636 | return cpu_get_icount(); |
| 637 | } else { |
| 638 | return cpu_get_clock(); |
| 639 | } |
| 640 | case QEMU_CLOCK_HOST: |
| 641 | return get_clock_realtime(); |
| 642 | } |
| 643 | } |
| 644 | |
| 645 | void init_clocks(void) |
| 646 | { |
| 647 | init_get_clock(); |
| 648 | rt_clock = qemu_new_clock(QEMU_CLOCK_REALTIME); |
| 649 | vm_clock = qemu_new_clock(QEMU_CLOCK_VIRTUAL); |
| 650 | host_clock = qemu_new_clock(QEMU_CLOCK_HOST); |
| 651 | |
| 652 | rtc_clock = host_clock; |
| 653 | } |
| 654 | |
| 655 | /* save a timer */ |
| 656 | void qemu_put_timer(QEMUFile *f, QEMUTimer *ts) |
| 657 | { |
| 658 | uint64_t expire_time; |
| 659 | |
| 660 | if (qemu_timer_pending(ts)) { |
| 661 | expire_time = ts->expire_time; |
| 662 | } else { |
| 663 | expire_time = -1; |
| 664 | } |
| 665 | qemu_put_be64(f, expire_time); |
| 666 | } |
| 667 | |
| 668 | void qemu_get_timer(QEMUFile *f, QEMUTimer *ts) |
| 669 | { |
| 670 | uint64_t expire_time; |
| 671 | |
| 672 | expire_time = qemu_get_be64(f); |
| 673 | if (expire_time != -1) { |
| 674 | qemu_mod_timer(ts, expire_time); |
| 675 | } else { |
| 676 | qemu_del_timer(ts); |
| 677 | } |
| 678 | } |
| 679 | |
| 680 | #if 0 |
| 681 | static const VMStateDescription vmstate_timers = { |
| 682 | .name = "timer", |
| 683 | .version_id = 2, |
| 684 | .minimum_version_id = 1, |
| 685 | .minimum_version_id_old = 1, |
| 686 | .fields = (VMStateField []) { |
| 687 | VMSTATE_INT64(cpu_ticks_offset, TimersState), |
| 688 | VMSTATE_INT64(dummy, TimersState), |
| 689 | VMSTATE_INT64_V(cpu_clock_offset, TimersState, 2), |
| 690 | VMSTATE_END_OF_LIST() |
| 691 | } |
| 692 | }; |
| 693 | #endif |
| 694 | |
| 695 | void configure_icount(const char *option) |
| 696 | { |
| 697 | register_savevm("timer", 0, 2, timer_save, timer_load, NULL); |
| 698 | |
| 699 | if (!option) |
| 700 | return; |
| 701 | |
| 702 | if (strcmp(option, "auto") != 0) { |
| 703 | icount_time_shift = strtol(option, NULL, 0); |
| 704 | use_icount = 1; |
| 705 | return; |
| 706 | } |
| 707 | |
| 708 | use_icount = 2; |
| 709 | |
| 710 | /* 125MIPS seems a reasonable initial guess at the guest speed. |
| 711 | It will be corrected fairly quickly anyway. */ |
| 712 | icount_time_shift = 3; |
| 713 | |
| 714 | /* Have both realtime and virtual time triggers for speed adjustment. |
| 715 | The realtime trigger catches emulated time passing too slowly, |
| 716 | the virtual time trigger catches emulated time passing too fast. |
| 717 | Realtime triggers occur even when idle, so use them less frequently |
| 718 | than VM triggers. */ |
| 719 | icount_rt_timer = qemu_new_timer(rt_clock, icount_adjust_rt, NULL); |
| 720 | qemu_mod_timer(icount_rt_timer, |
| 721 | qemu_get_clock(rt_clock) + 1000); |
| 722 | icount_vm_timer = qemu_new_timer(vm_clock, icount_adjust_vm, NULL); |
| 723 | qemu_mod_timer(icount_vm_timer, |
| 724 | qemu_get_clock(vm_clock) + get_ticks_per_sec() / 10); |
| 725 | } |
| 726 | |
| 727 | void qemu_run_all_timers(void) |
| 728 | { |
| 729 | alarm_timer->pending = 0; |
| 730 | |
| 731 | /* rearm timer, if not periodic */ |
| 732 | if (alarm_timer->expired) { |
| 733 | alarm_timer->expired = 0; |
| 734 | qemu_rearm_alarm_timer(alarm_timer); |
| 735 | } |
| 736 | |
| 737 | /* vm time timers */ |
| 738 | if (vm_running) { |
| 739 | qemu_run_timers(vm_clock); |
| 740 | } |
| 741 | |
| 742 | qemu_run_timers(rt_clock); |
| 743 | qemu_run_timers(host_clock); |
| 744 | } |
| 745 | |
| 746 | #ifdef _WIN32 |
| 747 | static void CALLBACK host_alarm_handler(UINT uTimerID, UINT uMsg, |
| 748 | DWORD_PTR dwUser, DWORD_PTR dw1, |
| 749 | DWORD_PTR dw2) |
| 750 | #else |
| 751 | static void host_alarm_handler(int host_signum) |
| 752 | #endif |
| 753 | { |
| 754 | struct qemu_alarm_timer *t = alarm_timer; |
| 755 | if (!t) |
| 756 | return; |
| 757 | |
| 758 | #if 0 |
| 759 | #define DISP_FREQ 1000 |
| 760 | { |
| 761 | static int64_t delta_min = INT64_MAX; |
| 762 | static int64_t delta_max, delta_cum, last_clock, delta, ti; |
| 763 | static int count; |
| 764 | ti = qemu_get_clock(vm_clock); |
| 765 | if (last_clock != 0) { |
| 766 | delta = ti - last_clock; |
| 767 | if (delta < delta_min) |
| 768 | delta_min = delta; |
| 769 | if (delta > delta_max) |
| 770 | delta_max = delta; |
| 771 | delta_cum += delta; |
| 772 | if (++count == DISP_FREQ) { |
| 773 | printf("timer: min=%" PRId64 " us max=%" PRId64 " us avg=%" PRId64 " us avg_freq=%0.3f Hz\n", |
| 774 | muldiv64(delta_min, 1000000, get_ticks_per_sec()), |
| 775 | muldiv64(delta_max, 1000000, get_ticks_per_sec()), |
| 776 | muldiv64(delta_cum, 1000000 / DISP_FREQ, get_ticks_per_sec()), |
| 777 | (double)get_ticks_per_sec() / ((double)delta_cum / DISP_FREQ)); |
| 778 | count = 0; |
| 779 | delta_min = INT64_MAX; |
| 780 | delta_max = 0; |
| 781 | delta_cum = 0; |
| 782 | } |
| 783 | } |
| 784 | last_clock = ti; |
| 785 | } |
| 786 | #endif |
| 787 | if (alarm_has_dynticks(t) || |
| 788 | (!use_icount && |
| 789 | qemu_timer_expired(active_timers[QEMU_CLOCK_VIRTUAL], |
| 790 | qemu_get_clock(vm_clock))) || |
| 791 | qemu_timer_expired(active_timers[QEMU_CLOCK_REALTIME], |
| 792 | qemu_get_clock(rt_clock)) || |
| 793 | qemu_timer_expired(active_timers[QEMU_CLOCK_HOST], |
| 794 | qemu_get_clock(host_clock))) { |
| 795 | |
| 796 | t->expired = alarm_has_dynticks(t); |
| 797 | t->pending = 1; |
| 798 | qemu_notify_event(); |
| 799 | } |
| 800 | } |
| 801 | |
| 802 | int64_t qemu_next_deadline(void) |
| 803 | { |
| 804 | /* To avoid problems with overflow limit this to 2^32. */ |
| 805 | int64_t delta = INT32_MAX; |
| 806 | |
| 807 | if (active_timers[QEMU_CLOCK_VIRTUAL]) { |
| 808 | delta = active_timers[QEMU_CLOCK_VIRTUAL]->expire_time - |
| 809 | qemu_get_clock(vm_clock); |
| 810 | } |
| 811 | if (active_timers[QEMU_CLOCK_HOST]) { |
| 812 | int64_t hdelta = active_timers[QEMU_CLOCK_HOST]->expire_time - |
| 813 | qemu_get_clock(host_clock); |
| 814 | if (hdelta < delta) |
| 815 | delta = hdelta; |
| 816 | } |
| 817 | |
| 818 | if (delta < 0) |
| 819 | delta = 0; |
| 820 | |
| 821 | return delta; |
| 822 | } |
| 823 | |
| 824 | #ifndef _WIN32 |
| 825 | |
| 826 | #if defined(__linux__) |
| 827 | |
| 828 | #define RTC_FREQ 1024 |
| 829 | |
| 830 | static uint64_t qemu_next_deadline_dyntick(void) |
| 831 | { |
| 832 | int64_t delta; |
| 833 | int64_t rtdelta; |
| 834 | |
| 835 | if (use_icount) |
| 836 | delta = INT32_MAX; |
| 837 | else |
| 838 | delta = (qemu_next_deadline() + 999) / 1000; |
| 839 | |
| 840 | if (active_timers[QEMU_CLOCK_REALTIME]) { |
| 841 | rtdelta = (active_timers[QEMU_CLOCK_REALTIME]->expire_time - |
| 842 | qemu_get_clock(rt_clock))*1000; |
| 843 | if (rtdelta < delta) |
| 844 | delta = rtdelta; |
| 845 | } |
| 846 | |
| 847 | if (delta < MIN_TIMER_REARM_US) |
| 848 | delta = MIN_TIMER_REARM_US; |
| 849 | |
| 850 | return delta; |
| 851 | } |
| 852 | |
| 853 | static void enable_sigio_timer(int fd) |
| 854 | { |
| 855 | struct sigaction act; |
| 856 | |
| 857 | /* timer signal */ |
| 858 | sigfillset(&act.sa_mask); |
| 859 | act.sa_flags = 0; |
| 860 | act.sa_handler = host_alarm_handler; |
| 861 | |
| 862 | sigaction(SIGIO, &act, NULL); |
| 863 | fcntl_setfl(fd, O_ASYNC); |
| 864 | fcntl(fd, F_SETOWN, getpid()); |
| 865 | } |
| 866 | |
| 867 | static int hpet_start_timer(struct qemu_alarm_timer *t) |
| 868 | { |
| 869 | struct hpet_info info; |
| 870 | int r, fd; |
| 871 | |
| 872 | fd = open("/dev/hpet", O_RDONLY); |
| 873 | if (fd < 0) |
| 874 | return -1; |
| 875 | |
| 876 | /* Set frequency */ |
| 877 | r = ioctl(fd, HPET_IRQFREQ, RTC_FREQ); |
| 878 | if (r < 0) { |
| 879 | fprintf(stderr, "Could not configure '/dev/hpet' to have a 1024Hz timer. This is not a fatal\n" |
| 880 | "error, but for better emulation accuracy type:\n" |
| 881 | "'echo 1024 > /proc/sys/dev/hpet/max-user-freq' as root.\n"); |
| 882 | goto fail; |
| 883 | } |
| 884 | |
| 885 | /* Check capabilities */ |
| 886 | r = ioctl(fd, HPET_INFO, &info); |
| 887 | if (r < 0) |
| 888 | goto fail; |
| 889 | |
| 890 | /* Enable periodic mode */ |
| 891 | r = ioctl(fd, HPET_EPI, 0); |
| 892 | if (info.hi_flags && (r < 0)) |
| 893 | goto fail; |
| 894 | |
| 895 | /* Enable interrupt */ |
| 896 | r = ioctl(fd, HPET_IE_ON, 0); |
| 897 | if (r < 0) |
| 898 | goto fail; |
| 899 | |
| 900 | enable_sigio_timer(fd); |
| 901 | t->priv = (void *)(long)fd; |
| 902 | |
| 903 | return 0; |
| 904 | fail: |
| 905 | close(fd); |
| 906 | return -1; |
| 907 | } |
| 908 | |
| 909 | static void hpet_stop_timer(struct qemu_alarm_timer *t) |
| 910 | { |
| 911 | int fd = (long)t->priv; |
| 912 | |
| 913 | close(fd); |
| 914 | } |
| 915 | |
| 916 | static int rtc_start_timer(struct qemu_alarm_timer *t) |
| 917 | { |
| 918 | int rtc_fd; |
| 919 | unsigned long current_rtc_freq = 0; |
| 920 | |
| 921 | TFR(rtc_fd = open("/dev/rtc", O_RDONLY)); |
| 922 | if (rtc_fd < 0) |
| 923 | return -1; |
| 924 | ioctl(rtc_fd, RTC_IRQP_READ, ¤t_rtc_freq); |
| 925 | if (current_rtc_freq != RTC_FREQ && |
| 926 | ioctl(rtc_fd, RTC_IRQP_SET, RTC_FREQ) < 0) { |
| 927 | fprintf(stderr, "Could not configure '/dev/rtc' to have a 1024 Hz timer. This is not a fatal\n" |
| 928 | "error, but for better emulation accuracy either use a 2.6 host Linux kernel or\n" |
| 929 | "type 'echo 1024 > /proc/sys/dev/rtc/max-user-freq' as root.\n"); |
| 930 | goto fail; |
| 931 | } |
| 932 | if (ioctl(rtc_fd, RTC_PIE_ON, 0) < 0) { |
| 933 | fail: |
| 934 | close(rtc_fd); |
| 935 | return -1; |
| 936 | } |
| 937 | |
| 938 | enable_sigio_timer(rtc_fd); |
| 939 | |
| 940 | t->priv = (void *)(long)rtc_fd; |
| 941 | |
| 942 | return 0; |
| 943 | } |
| 944 | |
| 945 | static void rtc_stop_timer(struct qemu_alarm_timer *t) |
| 946 | { |
| 947 | int rtc_fd = (long)t->priv; |
| 948 | |
| 949 | close(rtc_fd); |
| 950 | } |
| 951 | |
| 952 | static int dynticks_start_timer(struct qemu_alarm_timer *t) |
| 953 | { |
| 954 | struct sigevent ev; |
| 955 | timer_t host_timer; |
| 956 | struct sigaction act; |
| 957 | |
| 958 | sigfillset(&act.sa_mask); |
| 959 | act.sa_flags = 0; |
| 960 | act.sa_handler = host_alarm_handler; |
| 961 | |
| 962 | sigaction(SIGALRM, &act, NULL); |
| 963 | |
| 964 | /* |
| 965 | * Initialize ev struct to 0 to avoid valgrind complaining |
| 966 | * about uninitialized data in timer_create call |
| 967 | */ |
| 968 | memset(&ev, 0, sizeof(ev)); |
| 969 | ev.sigev_value.sival_int = 0; |
| 970 | ev.sigev_notify = SIGEV_SIGNAL; |
| 971 | ev.sigev_signo = SIGALRM; |
| 972 | |
| 973 | if (timer_create(CLOCK_REALTIME, &ev, &host_timer)) { |
| 974 | perror("timer_create"); |
| 975 | |
| 976 | /* disable dynticks */ |
| 977 | fprintf(stderr, "Dynamic Ticks disabled\n"); |
| 978 | |
| 979 | return -1; |
| 980 | } |
| 981 | |
| 982 | t->priv = (void *)(long)host_timer; |
| 983 | |
| 984 | return 0; |
| 985 | } |
| 986 | |
| 987 | static void dynticks_stop_timer(struct qemu_alarm_timer *t) |
| 988 | { |
| 989 | timer_t host_timer = (timer_t)(long)t->priv; |
| 990 | |
| 991 | timer_delete(host_timer); |
| 992 | } |
| 993 | |
| 994 | static void dynticks_rearm_timer(struct qemu_alarm_timer *t) |
| 995 | { |
| 996 | timer_t host_timer = (timer_t)(long)t->priv; |
| 997 | struct itimerspec timeout; |
| 998 | int64_t nearest_delta_us = INT64_MAX; |
| 999 | int64_t current_us; |
| 1000 | |
| 1001 | assert(alarm_has_dynticks(t)); |
| 1002 | if (!active_timers[QEMU_CLOCK_REALTIME] && |
| 1003 | !active_timers[QEMU_CLOCK_VIRTUAL] && |
| 1004 | !active_timers[QEMU_CLOCK_HOST]) |
| 1005 | return; |
| 1006 | |
| 1007 | nearest_delta_us = qemu_next_deadline_dyntick(); |
| 1008 | |
| 1009 | /* check whether a timer is already running */ |
| 1010 | if (timer_gettime(host_timer, &timeout)) { |
| 1011 | perror("gettime"); |
| 1012 | fprintf(stderr, "Internal timer error: aborting\n"); |
| 1013 | exit(1); |
| 1014 | } |
| 1015 | current_us = timeout.it_value.tv_sec * 1000000 + timeout.it_value.tv_nsec/1000; |
| 1016 | if (current_us && current_us <= nearest_delta_us) |
| 1017 | return; |
| 1018 | |
| 1019 | timeout.it_interval.tv_sec = 0; |
| 1020 | timeout.it_interval.tv_nsec = 0; /* 0 for one-shot timer */ |
| 1021 | timeout.it_value.tv_sec = nearest_delta_us / 1000000; |
| 1022 | timeout.it_value.tv_nsec = (nearest_delta_us % 1000000) * 1000; |
| 1023 | if (timer_settime(host_timer, 0 /* RELATIVE */, &timeout, NULL)) { |
| 1024 | perror("settime"); |
| 1025 | fprintf(stderr, "Internal timer error: aborting\n"); |
| 1026 | exit(1); |
| 1027 | } |
| 1028 | } |
| 1029 | |
| 1030 | #endif /* defined(__linux__) */ |
| 1031 | |
| 1032 | static int unix_start_timer(struct qemu_alarm_timer *t) |
| 1033 | { |
| 1034 | struct sigaction act; |
| 1035 | struct itimerval itv; |
| 1036 | int err; |
| 1037 | |
| 1038 | /* timer signal */ |
| 1039 | sigfillset(&act.sa_mask); |
| 1040 | act.sa_flags = 0; |
| 1041 | act.sa_handler = host_alarm_handler; |
| 1042 | |
| 1043 | sigaction(SIGALRM, &act, NULL); |
| 1044 | |
| 1045 | itv.it_interval.tv_sec = 0; |
| 1046 | /* for i386 kernel 2.6 to get 1 ms */ |
| 1047 | itv.it_interval.tv_usec = 999; |
| 1048 | itv.it_value.tv_sec = 0; |
| 1049 | itv.it_value.tv_usec = 10 * 1000; |
| 1050 | |
| 1051 | err = setitimer(ITIMER_REAL, &itv, NULL); |
| 1052 | if (err) |
| 1053 | return -1; |
| 1054 | |
| 1055 | return 0; |
| 1056 | } |
| 1057 | |
| 1058 | static void unix_stop_timer(struct qemu_alarm_timer *t) |
| 1059 | { |
| 1060 | struct itimerval itv; |
| 1061 | |
| 1062 | memset(&itv, 0, sizeof(itv)); |
| 1063 | setitimer(ITIMER_REAL, &itv, NULL); |
| 1064 | } |
| 1065 | |
| 1066 | #endif /* !defined(_WIN32) */ |
| 1067 | |
| 1068 | |
| 1069 | #ifdef _WIN32 |
| 1070 | |
| 1071 | static int win32_start_timer(struct qemu_alarm_timer *t) |
| 1072 | { |
| 1073 | TIMECAPS tc; |
| 1074 | struct qemu_alarm_win32 *data = t->priv; |
| 1075 | UINT flags; |
| 1076 | |
| 1077 | memset(&tc, 0, sizeof(tc)); |
| 1078 | timeGetDevCaps(&tc, sizeof(tc)); |
| 1079 | |
| 1080 | data->period = tc.wPeriodMin; |
| 1081 | timeBeginPeriod(data->period); |
| 1082 | |
| 1083 | flags = TIME_CALLBACK_FUNCTION; |
| 1084 | if (alarm_has_dynticks(t)) |
| 1085 | flags |= TIME_ONESHOT; |
| 1086 | else |
| 1087 | flags |= TIME_PERIODIC; |
| 1088 | |
| 1089 | data->timerId = timeSetEvent(1, // interval (ms) |
| 1090 | data->period, // resolution |
| 1091 | host_alarm_handler, // function |
| 1092 | (DWORD)t, // parameter |
| 1093 | flags); |
| 1094 | |
| 1095 | if (!data->timerId) { |
| 1096 | fprintf(stderr, "Failed to initialize win32 alarm timer: %ld\n", |
| 1097 | GetLastError()); |
| 1098 | timeEndPeriod(data->period); |
| 1099 | return -1; |
| 1100 | } |
| 1101 | |
| 1102 | return 0; |
| 1103 | } |
| 1104 | |
| 1105 | static void win32_stop_timer(struct qemu_alarm_timer *t) |
| 1106 | { |
| 1107 | struct qemu_alarm_win32 *data = t->priv; |
| 1108 | |
| 1109 | timeKillEvent(data->timerId); |
| 1110 | timeEndPeriod(data->period); |
| 1111 | } |
| 1112 | |
| 1113 | static void win32_rearm_timer(struct qemu_alarm_timer *t) |
| 1114 | { |
| 1115 | struct qemu_alarm_win32 *data = t->priv; |
| 1116 | |
| 1117 | assert(alarm_has_dynticks(t)); |
| 1118 | if (!active_timers[QEMU_CLOCK_REALTIME] && |
| 1119 | !active_timers[QEMU_CLOCK_VIRTUAL] && |
| 1120 | !active_timers[QEMU_CLOCK_HOST]) |
| 1121 | return; |
| 1122 | |
| 1123 | timeKillEvent(data->timerId); |
| 1124 | |
| 1125 | data->timerId = timeSetEvent(1, |
| 1126 | data->period, |
| 1127 | host_alarm_handler, |
| 1128 | (DWORD)t, |
| 1129 | TIME_ONESHOT | TIME_CALLBACK_FUNCTION); |
| 1130 | |
| 1131 | if (!data->timerId) { |
| 1132 | fprintf(stderr, "Failed to re-arm win32 alarm timer %ld\n", |
| 1133 | GetLastError()); |
| 1134 | |
| 1135 | timeEndPeriod(data->period); |
| 1136 | exit(1); |
| 1137 | } |
| 1138 | } |
| 1139 | |
| 1140 | #endif /* _WIN32 */ |
| 1141 | |
| 1142 | static void alarm_timer_on_change_state_rearm(void *opaque, int running, int reason) |
| 1143 | { |
| 1144 | if (running) |
| 1145 | qemu_rearm_alarm_timer((struct qemu_alarm_timer *) opaque); |
| 1146 | } |
| 1147 | |
| 1148 | int init_timer_alarm(void) |
| 1149 | { |
| 1150 | struct qemu_alarm_timer *t = NULL; |
| 1151 | int i, err = -1; |
| 1152 | |
| 1153 | for (i = 0; alarm_timers[i].name; i++) { |
| 1154 | t = &alarm_timers[i]; |
| 1155 | |
| 1156 | err = t->start(t); |
| 1157 | if (!err) |
| 1158 | break; |
| 1159 | } |
| 1160 | |
| 1161 | if (err) { |
| 1162 | err = -ENOENT; |
| 1163 | goto fail; |
| 1164 | } |
| 1165 | |
| 1166 | /* first event is at time 0 */ |
| 1167 | t->pending = 1; |
| 1168 | alarm_timer = t; |
| 1169 | qemu_add_vm_change_state_handler(alarm_timer_on_change_state_rearm, t); |
| 1170 | |
| 1171 | return 0; |
| 1172 | |
| 1173 | fail: |
| 1174 | return err; |
| 1175 | } |
| 1176 | |
| 1177 | void quit_timers(void) |
| 1178 | { |
| 1179 | struct qemu_alarm_timer *t = alarm_timer; |
| 1180 | alarm_timer = NULL; |
| 1181 | t->stop(t); |
| 1182 | } |
| 1183 | |
| 1184 | int qemu_calculate_timeout(void) |
| 1185 | { |
| 1186 | #ifndef CONFIG_IOTHREAD |
| 1187 | int timeout; |
| 1188 | |
| 1189 | if (!vm_running) |
| 1190 | timeout = 5000; |
| 1191 | else { |
| 1192 | /* XXX: use timeout computed from timers */ |
| 1193 | int64_t add; |
| 1194 | int64_t delta; |
| 1195 | /* Advance virtual time to the next event. */ |
| 1196 | delta = qemu_icount_delta(); |
| 1197 | if (delta > 0) { |
| 1198 | /* If virtual time is ahead of real time then just |
| 1199 | wait for IO. */ |
| 1200 | timeout = (delta + 999999) / 1000000; |
| 1201 | } else { |
| 1202 | /* Wait for either IO to occur or the next |
| 1203 | timer event. */ |
| 1204 | add = qemu_next_deadline(); |
| 1205 | /* We advance the timer before checking for IO. |
| 1206 | Limit the amount we advance so that early IO |
| 1207 | activity won't get the guest too far ahead. */ |
| 1208 | if (add > 10000000) |
| 1209 | add = 10000000; |
| 1210 | delta += add; |
| 1211 | qemu_icount += qemu_icount_round (add); |
| 1212 | timeout = delta / 1000000; |
| 1213 | if (timeout < 0) |
| 1214 | timeout = 0; |
| 1215 | } |
| 1216 | } |
| 1217 | |
| 1218 | return timeout; |
| 1219 | #else /* CONFIG_IOTHREAD */ |
| 1220 | return 1000; |
| 1221 | #endif |
| 1222 | } |
| 1223 | |
| 1224 | /* Return the virtual CPU time, based on the instruction counter. */ |
| 1225 | int64_t cpu_get_icount(void) |
| 1226 | { |
| 1227 | int64_t icount; |
| 1228 | CPUState *env = cpu_single_env;; |
| 1229 | |
| 1230 | icount = qemu_icount; |
| 1231 | if (env) { |
| 1232 | if (!can_do_io(env)) { |
| 1233 | fprintf(stderr, "Bad clock read\n"); |
| 1234 | } |
| 1235 | icount -= (env->icount_decr.u16.low + env->icount_extra); |
| 1236 | } |
| 1237 | return qemu_icount_bias + (icount << icount_time_shift); |
| 1238 | } |