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db1a4972 PB |
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> | |
44459349 JL |
38 | #ifdef __FreeBSD__ |
39 | #include <sys/param.h> | |
40 | #endif | |
db1a4972 | 41 | |
db1a4972 PB |
42 | #ifdef _WIN32 |
43 | #include <windows.h> | |
44 | #include <mmsystem.h> | |
45 | #endif | |
46 | ||
db1a4972 | 47 | #include "qemu-timer.h" |
db1a4972 PB |
48 | |
49 | /* Conversion factor from emulated instructions to virtual clock ticks. */ | |
29e922b6 | 50 | int icount_time_shift; |
db1a4972 PB |
51 | /* Arbitrarily pick 1MIPS as the minimum allowable speed. */ |
52 | #define MAX_ICOUNT_SHIFT 10 | |
53 | /* Compensate for varying guest execution speed. */ | |
29e922b6 | 54 | int64_t qemu_icount_bias; |
db1a4972 PB |
55 | static QEMUTimer *icount_rt_timer; |
56 | static QEMUTimer *icount_vm_timer; | |
57 | ||
db1a4972 PB |
58 | /***********************************************************/ |
59 | /* guest cycle counter */ | |
60 | ||
61 | typedef struct TimersState { | |
62 | int64_t cpu_ticks_prev; | |
63 | int64_t cpu_ticks_offset; | |
64 | int64_t cpu_clock_offset; | |
65 | int32_t cpu_ticks_enabled; | |
66 | int64_t dummy; | |
67 | } TimersState; | |
68 | ||
69 | TimersState timers_state; | |
70 | ||
71 | /* return the host CPU cycle counter and handle stop/restart */ | |
72 | int64_t cpu_get_ticks(void) | |
73 | { | |
74 | if (use_icount) { | |
75 | return cpu_get_icount(); | |
76 | } | |
77 | if (!timers_state.cpu_ticks_enabled) { | |
78 | return timers_state.cpu_ticks_offset; | |
79 | } else { | |
80 | int64_t ticks; | |
81 | ticks = cpu_get_real_ticks(); | |
82 | if (timers_state.cpu_ticks_prev > ticks) { | |
83 | /* Note: non increasing ticks may happen if the host uses | |
84 | software suspend */ | |
85 | timers_state.cpu_ticks_offset += timers_state.cpu_ticks_prev - ticks; | |
86 | } | |
87 | timers_state.cpu_ticks_prev = ticks; | |
88 | return ticks + timers_state.cpu_ticks_offset; | |
89 | } | |
90 | } | |
91 | ||
92 | /* return the host CPU monotonic timer and handle stop/restart */ | |
93 | static int64_t cpu_get_clock(void) | |
94 | { | |
95 | int64_t ti; | |
96 | if (!timers_state.cpu_ticks_enabled) { | |
97 | return timers_state.cpu_clock_offset; | |
98 | } else { | |
99 | ti = get_clock(); | |
100 | return ti + timers_state.cpu_clock_offset; | |
101 | } | |
102 | } | |
103 | ||
1ece93a9 | 104 | #ifndef CONFIG_IOTHREAD |
db1a4972 PB |
105 | static int64_t qemu_icount_delta(void) |
106 | { | |
1ece93a9 PB |
107 | if (!use_icount) { |
108 | return 5000 * (int64_t) 1000000; | |
109 | } else if (use_icount == 1) { | |
db1a4972 PB |
110 | /* When not using an adaptive execution frequency |
111 | we tend to get badly out of sync with real time, | |
112 | so just delay for a reasonable amount of time. */ | |
113 | return 0; | |
114 | } else { | |
115 | return cpu_get_icount() - cpu_get_clock(); | |
116 | } | |
117 | } | |
1ece93a9 | 118 | #endif |
db1a4972 PB |
119 | |
120 | /* enable cpu_get_ticks() */ | |
121 | void cpu_enable_ticks(void) | |
122 | { | |
123 | if (!timers_state.cpu_ticks_enabled) { | |
124 | timers_state.cpu_ticks_offset -= cpu_get_real_ticks(); | |
125 | timers_state.cpu_clock_offset -= get_clock(); | |
126 | timers_state.cpu_ticks_enabled = 1; | |
127 | } | |
128 | } | |
129 | ||
130 | /* disable cpu_get_ticks() : the clock is stopped. You must not call | |
131 | cpu_get_ticks() after that. */ | |
132 | void cpu_disable_ticks(void) | |
133 | { | |
134 | if (timers_state.cpu_ticks_enabled) { | |
135 | timers_state.cpu_ticks_offset = cpu_get_ticks(); | |
136 | timers_state.cpu_clock_offset = cpu_get_clock(); | |
137 | timers_state.cpu_ticks_enabled = 0; | |
138 | } | |
139 | } | |
140 | ||
141 | /***********************************************************/ | |
142 | /* timers */ | |
143 | ||
144 | #define QEMU_CLOCK_REALTIME 0 | |
145 | #define QEMU_CLOCK_VIRTUAL 1 | |
146 | #define QEMU_CLOCK_HOST 2 | |
147 | ||
148 | struct QEMUClock { | |
149 | int type; | |
150 | int enabled; | |
ab33fcda PB |
151 | |
152 | QEMUTimer *warp_timer; | |
691a0c9c JK |
153 | |
154 | NotifierList reset_notifiers; | |
155 | int64_t last; | |
db1a4972 PB |
156 | }; |
157 | ||
158 | struct QEMUTimer { | |
159 | QEMUClock *clock; | |
4a998740 PB |
160 | int64_t expire_time; /* in nanoseconds */ |
161 | int scale; | |
db1a4972 PB |
162 | QEMUTimerCB *cb; |
163 | void *opaque; | |
164 | struct QEMUTimer *next; | |
165 | }; | |
166 | ||
167 | struct qemu_alarm_timer { | |
168 | char const *name; | |
169 | int (*start)(struct qemu_alarm_timer *t); | |
170 | void (*stop)(struct qemu_alarm_timer *t); | |
171 | void (*rearm)(struct qemu_alarm_timer *t); | |
cd0544ee SW |
172 | #if defined(__linux__) |
173 | int fd; | |
174 | timer_t timer; | |
175 | #elif defined(_WIN32) | |
176 | HANDLE timer; | |
177 | #endif | |
db1a4972 PB |
178 | char expired; |
179 | char pending; | |
180 | }; | |
181 | ||
182 | static struct qemu_alarm_timer *alarm_timer; | |
183 | ||
45c7b37f SW |
184 | static bool qemu_timer_expired_ns(QEMUTimer *timer_head, int64_t current_time) |
185 | { | |
186 | return timer_head && (timer_head->expire_time <= current_time); | |
187 | } | |
188 | ||
db1a4972 PB |
189 | int qemu_alarm_pending(void) |
190 | { | |
191 | return alarm_timer->pending; | |
192 | } | |
193 | ||
194 | static inline int alarm_has_dynticks(struct qemu_alarm_timer *t) | |
195 | { | |
196 | return !!t->rearm; | |
197 | } | |
198 | ||
199 | static void qemu_rearm_alarm_timer(struct qemu_alarm_timer *t) | |
200 | { | |
201 | if (!alarm_has_dynticks(t)) | |
202 | return; | |
203 | ||
204 | t->rearm(t); | |
205 | } | |
206 | ||
9c13246a PB |
207 | /* TODO: MIN_TIMER_REARM_NS should be optimized */ |
208 | #define MIN_TIMER_REARM_NS 250000 | |
db1a4972 PB |
209 | |
210 | #ifdef _WIN32 | |
211 | ||
2f9cba0c SW |
212 | static int mm_start_timer(struct qemu_alarm_timer *t); |
213 | static void mm_stop_timer(struct qemu_alarm_timer *t); | |
214 | static void mm_rearm_timer(struct qemu_alarm_timer *t); | |
215 | ||
db1a4972 PB |
216 | static int win32_start_timer(struct qemu_alarm_timer *t); |
217 | static void win32_stop_timer(struct qemu_alarm_timer *t); | |
218 | static void win32_rearm_timer(struct qemu_alarm_timer *t); | |
219 | ||
220 | #else | |
221 | ||
222 | static int unix_start_timer(struct qemu_alarm_timer *t); | |
223 | static void unix_stop_timer(struct qemu_alarm_timer *t); | |
84682834 | 224 | static void unix_rearm_timer(struct qemu_alarm_timer *t); |
db1a4972 PB |
225 | |
226 | #ifdef __linux__ | |
227 | ||
228 | static int dynticks_start_timer(struct qemu_alarm_timer *t); | |
229 | static void dynticks_stop_timer(struct qemu_alarm_timer *t); | |
230 | static void dynticks_rearm_timer(struct qemu_alarm_timer *t); | |
231 | ||
db1a4972 PB |
232 | #endif /* __linux__ */ |
233 | ||
234 | #endif /* _WIN32 */ | |
235 | ||
236 | /* Correlation between real and virtual time is always going to be | |
237 | fairly approximate, so ignore small variation. | |
238 | When the guest is idle real and virtual time will be aligned in | |
239 | the IO wait loop. */ | |
240 | #define ICOUNT_WOBBLE (get_ticks_per_sec() / 10) | |
241 | ||
242 | static void icount_adjust(void) | |
243 | { | |
244 | int64_t cur_time; | |
245 | int64_t cur_icount; | |
246 | int64_t delta; | |
247 | static int64_t last_delta; | |
248 | /* If the VM is not running, then do nothing. */ | |
249 | if (!vm_running) | |
250 | return; | |
251 | ||
252 | cur_time = cpu_get_clock(); | |
74475455 | 253 | cur_icount = qemu_get_clock_ns(vm_clock); |
db1a4972 PB |
254 | delta = cur_icount - cur_time; |
255 | /* FIXME: This is a very crude algorithm, somewhat prone to oscillation. */ | |
256 | if (delta > 0 | |
257 | && last_delta + ICOUNT_WOBBLE < delta * 2 | |
258 | && icount_time_shift > 0) { | |
259 | /* The guest is getting too far ahead. Slow time down. */ | |
260 | icount_time_shift--; | |
261 | } | |
262 | if (delta < 0 | |
263 | && last_delta - ICOUNT_WOBBLE > delta * 2 | |
264 | && icount_time_shift < MAX_ICOUNT_SHIFT) { | |
265 | /* The guest is getting too far behind. Speed time up. */ | |
266 | icount_time_shift++; | |
267 | } | |
268 | last_delta = delta; | |
269 | qemu_icount_bias = cur_icount - (qemu_icount << icount_time_shift); | |
270 | } | |
271 | ||
272 | static void icount_adjust_rt(void * opaque) | |
273 | { | |
274 | qemu_mod_timer(icount_rt_timer, | |
7bd427d8 | 275 | qemu_get_clock_ms(rt_clock) + 1000); |
db1a4972 PB |
276 | icount_adjust(); |
277 | } | |
278 | ||
279 | static void icount_adjust_vm(void * opaque) | |
280 | { | |
281 | qemu_mod_timer(icount_vm_timer, | |
74475455 | 282 | qemu_get_clock_ns(vm_clock) + get_ticks_per_sec() / 10); |
db1a4972 PB |
283 | icount_adjust(); |
284 | } | |
285 | ||
286 | int64_t qemu_icount_round(int64_t count) | |
287 | { | |
288 | return (count + (1 << icount_time_shift) - 1) >> icount_time_shift; | |
289 | } | |
290 | ||
291 | static struct qemu_alarm_timer alarm_timers[] = { | |
292 | #ifndef _WIN32 | |
293 | #ifdef __linux__ | |
294 | {"dynticks", dynticks_start_timer, | |
cd0544ee | 295 | dynticks_stop_timer, dynticks_rearm_timer}, |
db1a4972 | 296 | #endif |
84682834 | 297 | {"unix", unix_start_timer, unix_stop_timer, unix_rearm_timer}, |
db1a4972 | 298 | #else |
2f9cba0c SW |
299 | {"mmtimer", mm_start_timer, mm_stop_timer, NULL}, |
300 | {"mmtimer2", mm_start_timer, mm_stop_timer, mm_rearm_timer}, | |
cd0544ee SW |
301 | {"dynticks", win32_start_timer, win32_stop_timer, win32_rearm_timer}, |
302 | {"win32", win32_start_timer, win32_stop_timer, NULL}, | |
db1a4972 PB |
303 | #endif |
304 | {NULL, } | |
305 | }; | |
306 | ||
307 | static void show_available_alarms(void) | |
308 | { | |
309 | int i; | |
310 | ||
311 | printf("Available alarm timers, in order of precedence:\n"); | |
312 | for (i = 0; alarm_timers[i].name; i++) | |
313 | printf("%s\n", alarm_timers[i].name); | |
314 | } | |
315 | ||
316 | void configure_alarms(char const *opt) | |
317 | { | |
318 | int i; | |
319 | int cur = 0; | |
320 | int count = ARRAY_SIZE(alarm_timers) - 1; | |
321 | char *arg; | |
322 | char *name; | |
323 | struct qemu_alarm_timer tmp; | |
324 | ||
325 | if (!strcmp(opt, "?")) { | |
326 | show_available_alarms(); | |
327 | exit(0); | |
328 | } | |
329 | ||
330 | arg = qemu_strdup(opt); | |
331 | ||
332 | /* Reorder the array */ | |
333 | name = strtok(arg, ","); | |
334 | while (name) { | |
335 | for (i = 0; i < count && alarm_timers[i].name; i++) { | |
336 | if (!strcmp(alarm_timers[i].name, name)) | |
337 | break; | |
338 | } | |
339 | ||
340 | if (i == count) { | |
341 | fprintf(stderr, "Unknown clock %s\n", name); | |
342 | goto next; | |
343 | } | |
344 | ||
345 | if (i < cur) | |
346 | /* Ignore */ | |
347 | goto next; | |
348 | ||
349 | /* Swap */ | |
350 | tmp = alarm_timers[i]; | |
351 | alarm_timers[i] = alarm_timers[cur]; | |
352 | alarm_timers[cur] = tmp; | |
353 | ||
354 | cur++; | |
355 | next: | |
356 | name = strtok(NULL, ","); | |
357 | } | |
358 | ||
359 | qemu_free(arg); | |
360 | ||
361 | if (cur) { | |
362 | /* Disable remaining timers */ | |
363 | for (i = cur; i < count; i++) | |
364 | alarm_timers[i].name = NULL; | |
365 | } else { | |
366 | show_available_alarms(); | |
367 | exit(1); | |
368 | } | |
369 | } | |
370 | ||
371 | #define QEMU_NUM_CLOCKS 3 | |
372 | ||
373 | QEMUClock *rt_clock; | |
374 | QEMUClock *vm_clock; | |
375 | QEMUClock *host_clock; | |
376 | ||
377 | static QEMUTimer *active_timers[QEMU_NUM_CLOCKS]; | |
378 | ||
379 | static QEMUClock *qemu_new_clock(int type) | |
380 | { | |
381 | QEMUClock *clock; | |
691a0c9c | 382 | |
db1a4972 PB |
383 | clock = qemu_mallocz(sizeof(QEMUClock)); |
384 | clock->type = type; | |
385 | clock->enabled = 1; | |
691a0c9c JK |
386 | notifier_list_init(&clock->reset_notifiers); |
387 | /* required to detect & report backward jumps */ | |
388 | if (type == QEMU_CLOCK_HOST) { | |
389 | clock->last = get_clock_realtime(); | |
390 | } | |
db1a4972 PB |
391 | return clock; |
392 | } | |
393 | ||
394 | void qemu_clock_enable(QEMUClock *clock, int enabled) | |
395 | { | |
396 | clock->enabled = enabled; | |
397 | } | |
398 | ||
ab33fcda PB |
399 | static int64_t vm_clock_warp_start; |
400 | ||
401 | static void icount_warp_rt(void *opaque) | |
402 | { | |
403 | if (vm_clock_warp_start == -1) { | |
404 | return; | |
405 | } | |
406 | ||
407 | if (vm_running) { | |
408 | int64_t clock = qemu_get_clock_ns(rt_clock); | |
409 | int64_t warp_delta = clock - vm_clock_warp_start; | |
410 | if (use_icount == 1) { | |
411 | qemu_icount_bias += warp_delta; | |
412 | } else { | |
413 | /* | |
414 | * In adaptive mode, do not let the vm_clock run too | |
415 | * far ahead of real time. | |
416 | */ | |
417 | int64_t cur_time = cpu_get_clock(); | |
418 | int64_t cur_icount = qemu_get_clock_ns(vm_clock); | |
419 | int64_t delta = cur_time - cur_icount; | |
420 | qemu_icount_bias += MIN(warp_delta, delta); | |
421 | } | |
422 | if (qemu_timer_expired(active_timers[QEMU_CLOCK_VIRTUAL], | |
423 | qemu_get_clock_ns(vm_clock))) { | |
424 | qemu_notify_event(); | |
425 | } | |
426 | } | |
427 | vm_clock_warp_start = -1; | |
428 | } | |
429 | ||
430 | void qemu_clock_warp(QEMUClock *clock) | |
431 | { | |
432 | int64_t deadline; | |
433 | ||
434 | if (!clock->warp_timer) { | |
435 | return; | |
436 | } | |
437 | ||
438 | /* | |
439 | * There are too many global variables to make the "warp" behavior | |
440 | * applicable to other clocks. But a clock argument removes the | |
441 | * need for if statements all over the place. | |
442 | */ | |
443 | assert(clock == vm_clock); | |
444 | ||
445 | /* | |
446 | * If the CPUs have been sleeping, advance the vm_clock timer now. This | |
447 | * ensures that the deadline for the timer is computed correctly below. | |
448 | * This also makes sure that the insn counter is synchronized before the | |
449 | * CPU starts running, in case the CPU is woken by an event other than | |
450 | * the earliest vm_clock timer. | |
451 | */ | |
452 | icount_warp_rt(NULL); | |
453 | if (!all_cpu_threads_idle() || !active_timers[clock->type]) { | |
454 | qemu_del_timer(clock->warp_timer); | |
455 | return; | |
456 | } | |
457 | ||
458 | vm_clock_warp_start = qemu_get_clock_ns(rt_clock); | |
cb842c90 | 459 | deadline = qemu_next_icount_deadline(); |
ab33fcda PB |
460 | if (deadline > 0) { |
461 | /* | |
462 | * Ensure the vm_clock proceeds even when the virtual CPU goes to | |
463 | * sleep. Otherwise, the CPU might be waiting for a future timer | |
464 | * interrupt to wake it up, but the interrupt never comes because | |
465 | * the vCPU isn't running any insns and thus doesn't advance the | |
466 | * vm_clock. | |
467 | * | |
468 | * An extreme solution for this problem would be to never let VCPUs | |
469 | * sleep in icount mode if there is a pending vm_clock timer; rather | |
470 | * time could just advance to the next vm_clock event. Instead, we | |
471 | * do stop VCPUs and only advance vm_clock after some "real" time, | |
472 | * (related to the time left until the next event) has passed. This | |
473 | * rt_clock timer will do this. This avoids that the warps are too | |
474 | * visible externally---for example, you will not be sending network | |
475 | * packets continously instead of every 100ms. | |
476 | */ | |
477 | qemu_mod_timer(clock->warp_timer, vm_clock_warp_start + deadline); | |
478 | } else { | |
479 | qemu_notify_event(); | |
480 | } | |
481 | } | |
482 | ||
4a998740 PB |
483 | QEMUTimer *qemu_new_timer(QEMUClock *clock, int scale, |
484 | QEMUTimerCB *cb, void *opaque) | |
db1a4972 PB |
485 | { |
486 | QEMUTimer *ts; | |
487 | ||
488 | ts = qemu_mallocz(sizeof(QEMUTimer)); | |
489 | ts->clock = clock; | |
490 | ts->cb = cb; | |
491 | ts->opaque = opaque; | |
4a998740 | 492 | ts->scale = scale; |
db1a4972 PB |
493 | return ts; |
494 | } | |
495 | ||
496 | void qemu_free_timer(QEMUTimer *ts) | |
497 | { | |
498 | qemu_free(ts); | |
499 | } | |
500 | ||
501 | /* stop a timer, but do not dealloc it */ | |
502 | void qemu_del_timer(QEMUTimer *ts) | |
503 | { | |
504 | QEMUTimer **pt, *t; | |
505 | ||
506 | /* NOTE: this code must be signal safe because | |
507 | qemu_timer_expired() can be called from a signal. */ | |
508 | pt = &active_timers[ts->clock->type]; | |
509 | for(;;) { | |
510 | t = *pt; | |
511 | if (!t) | |
512 | break; | |
513 | if (t == ts) { | |
514 | *pt = t->next; | |
515 | break; | |
516 | } | |
517 | pt = &t->next; | |
518 | } | |
519 | } | |
520 | ||
521 | /* modify the current timer so that it will be fired when current_time | |
522 | >= expire_time. The corresponding callback will be called. */ | |
4a998740 | 523 | static void qemu_mod_timer_ns(QEMUTimer *ts, int64_t expire_time) |
db1a4972 PB |
524 | { |
525 | QEMUTimer **pt, *t; | |
526 | ||
527 | qemu_del_timer(ts); | |
528 | ||
529 | /* add the timer in the sorted list */ | |
530 | /* NOTE: this code must be signal safe because | |
531 | qemu_timer_expired() can be called from a signal. */ | |
532 | pt = &active_timers[ts->clock->type]; | |
533 | for(;;) { | |
534 | t = *pt; | |
45c7b37f | 535 | if (!qemu_timer_expired_ns(t, expire_time)) { |
db1a4972 | 536 | break; |
45c7b37f | 537 | } |
db1a4972 PB |
538 | pt = &t->next; |
539 | } | |
540 | ts->expire_time = expire_time; | |
541 | ts->next = *pt; | |
542 | *pt = ts; | |
543 | ||
544 | /* Rearm if necessary */ | |
545 | if (pt == &active_timers[ts->clock->type]) { | |
546 | if (!alarm_timer->pending) { | |
547 | qemu_rearm_alarm_timer(alarm_timer); | |
548 | } | |
549 | /* Interrupt execution to force deadline recalculation. */ | |
ab33fcda PB |
550 | qemu_clock_warp(ts->clock); |
551 | if (use_icount) { | |
db1a4972 | 552 | qemu_notify_event(); |
ab33fcda | 553 | } |
db1a4972 PB |
554 | } |
555 | } | |
556 | ||
4a998740 PB |
557 | /* modify the current timer so that it will be fired when current_time |
558 | >= expire_time. The corresponding callback will be called. */ | |
559 | void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time) | |
560 | { | |
561 | qemu_mod_timer_ns(ts, expire_time * ts->scale); | |
562 | } | |
563 | ||
db1a4972 PB |
564 | int qemu_timer_pending(QEMUTimer *ts) |
565 | { | |
566 | QEMUTimer *t; | |
567 | for(t = active_timers[ts->clock->type]; t != NULL; t = t->next) { | |
568 | if (t == ts) | |
569 | return 1; | |
570 | } | |
571 | return 0; | |
572 | } | |
573 | ||
574 | int qemu_timer_expired(QEMUTimer *timer_head, int64_t current_time) | |
575 | { | |
45c7b37f | 576 | return qemu_timer_expired_ns(timer_head, current_time * timer_head->scale); |
db1a4972 PB |
577 | } |
578 | ||
579 | static void qemu_run_timers(QEMUClock *clock) | |
580 | { | |
581 | QEMUTimer **ptimer_head, *ts; | |
582 | int64_t current_time; | |
583 | ||
584 | if (!clock->enabled) | |
585 | return; | |
586 | ||
4a998740 | 587 | current_time = qemu_get_clock_ns(clock); |
db1a4972 PB |
588 | ptimer_head = &active_timers[clock->type]; |
589 | for(;;) { | |
590 | ts = *ptimer_head; | |
45c7b37f | 591 | if (!qemu_timer_expired_ns(ts, current_time)) { |
db1a4972 | 592 | break; |
45c7b37f | 593 | } |
db1a4972 PB |
594 | /* remove timer from the list before calling the callback */ |
595 | *ptimer_head = ts->next; | |
596 | ts->next = NULL; | |
597 | ||
598 | /* run the callback (the timer list can be modified) */ | |
599 | ts->cb(ts->opaque); | |
600 | } | |
601 | } | |
602 | ||
db1a4972 PB |
603 | int64_t qemu_get_clock_ns(QEMUClock *clock) |
604 | { | |
691a0c9c JK |
605 | int64_t now, last; |
606 | ||
db1a4972 PB |
607 | switch(clock->type) { |
608 | case QEMU_CLOCK_REALTIME: | |
609 | return get_clock(); | |
610 | default: | |
611 | case QEMU_CLOCK_VIRTUAL: | |
612 | if (use_icount) { | |
613 | return cpu_get_icount(); | |
614 | } else { | |
615 | return cpu_get_clock(); | |
616 | } | |
617 | case QEMU_CLOCK_HOST: | |
691a0c9c JK |
618 | now = get_clock_realtime(); |
619 | last = clock->last; | |
620 | clock->last = now; | |
621 | if (now < last) { | |
622 | notifier_list_notify(&clock->reset_notifiers, &now); | |
623 | } | |
624 | return now; | |
db1a4972 PB |
625 | } |
626 | } | |
627 | ||
691a0c9c JK |
628 | void qemu_register_clock_reset_notifier(QEMUClock *clock, Notifier *notifier) |
629 | { | |
630 | notifier_list_add(&clock->reset_notifiers, notifier); | |
631 | } | |
632 | ||
633 | void qemu_unregister_clock_reset_notifier(QEMUClock *clock, Notifier *notifier) | |
634 | { | |
635 | notifier_list_remove(&clock->reset_notifiers, notifier); | |
636 | } | |
637 | ||
db1a4972 PB |
638 | void init_clocks(void) |
639 | { | |
db1a4972 PB |
640 | rt_clock = qemu_new_clock(QEMU_CLOCK_REALTIME); |
641 | vm_clock = qemu_new_clock(QEMU_CLOCK_VIRTUAL); | |
642 | host_clock = qemu_new_clock(QEMU_CLOCK_HOST); | |
643 | ||
644 | rtc_clock = host_clock; | |
645 | } | |
646 | ||
647 | /* save a timer */ | |
648 | void qemu_put_timer(QEMUFile *f, QEMUTimer *ts) | |
649 | { | |
650 | uint64_t expire_time; | |
651 | ||
652 | if (qemu_timer_pending(ts)) { | |
653 | expire_time = ts->expire_time; | |
654 | } else { | |
655 | expire_time = -1; | |
656 | } | |
657 | qemu_put_be64(f, expire_time); | |
658 | } | |
659 | ||
660 | void qemu_get_timer(QEMUFile *f, QEMUTimer *ts) | |
661 | { | |
662 | uint64_t expire_time; | |
663 | ||
664 | expire_time = qemu_get_be64(f); | |
665 | if (expire_time != -1) { | |
4a998740 | 666 | qemu_mod_timer_ns(ts, expire_time); |
db1a4972 PB |
667 | } else { |
668 | qemu_del_timer(ts); | |
669 | } | |
670 | } | |
671 | ||
672 | static const VMStateDescription vmstate_timers = { | |
673 | .name = "timer", | |
674 | .version_id = 2, | |
675 | .minimum_version_id = 1, | |
676 | .minimum_version_id_old = 1, | |
677 | .fields = (VMStateField []) { | |
678 | VMSTATE_INT64(cpu_ticks_offset, TimersState), | |
679 | VMSTATE_INT64(dummy, TimersState), | |
680 | VMSTATE_INT64_V(cpu_clock_offset, TimersState, 2), | |
681 | VMSTATE_END_OF_LIST() | |
682 | } | |
683 | }; | |
684 | ||
685 | void configure_icount(const char *option) | |
686 | { | |
0be71e32 | 687 | vmstate_register(NULL, 0, &vmstate_timers, &timers_state); |
db1a4972 PB |
688 | if (!option) |
689 | return; | |
690 | ||
ab33fcda PB |
691 | #ifdef CONFIG_IOTHREAD |
692 | vm_clock->warp_timer = qemu_new_timer_ns(rt_clock, icount_warp_rt, NULL); | |
693 | #endif | |
694 | ||
db1a4972 PB |
695 | if (strcmp(option, "auto") != 0) { |
696 | icount_time_shift = strtol(option, NULL, 0); | |
697 | use_icount = 1; | |
698 | return; | |
699 | } | |
700 | ||
701 | use_icount = 2; | |
702 | ||
703 | /* 125MIPS seems a reasonable initial guess at the guest speed. | |
704 | It will be corrected fairly quickly anyway. */ | |
705 | icount_time_shift = 3; | |
706 | ||
707 | /* Have both realtime and virtual time triggers for speed adjustment. | |
708 | The realtime trigger catches emulated time passing too slowly, | |
709 | the virtual time trigger catches emulated time passing too fast. | |
710 | Realtime triggers occur even when idle, so use them less frequently | |
711 | than VM triggers. */ | |
7bd427d8 | 712 | icount_rt_timer = qemu_new_timer_ms(rt_clock, icount_adjust_rt, NULL); |
db1a4972 | 713 | qemu_mod_timer(icount_rt_timer, |
7bd427d8 | 714 | qemu_get_clock_ms(rt_clock) + 1000); |
74475455 | 715 | icount_vm_timer = qemu_new_timer_ns(vm_clock, icount_adjust_vm, NULL); |
db1a4972 | 716 | qemu_mod_timer(icount_vm_timer, |
74475455 | 717 | qemu_get_clock_ns(vm_clock) + get_ticks_per_sec() / 10); |
db1a4972 PB |
718 | } |
719 | ||
720 | void qemu_run_all_timers(void) | |
721 | { | |
ca5a2a4b PB |
722 | alarm_timer->pending = 0; |
723 | ||
db1a4972 PB |
724 | /* rearm timer, if not periodic */ |
725 | if (alarm_timer->expired) { | |
726 | alarm_timer->expired = 0; | |
727 | qemu_rearm_alarm_timer(alarm_timer); | |
728 | } | |
729 | ||
db1a4972 PB |
730 | /* vm time timers */ |
731 | if (vm_running) { | |
732 | qemu_run_timers(vm_clock); | |
733 | } | |
734 | ||
735 | qemu_run_timers(rt_clock); | |
736 | qemu_run_timers(host_clock); | |
737 | } | |
738 | ||
4c3d45eb PB |
739 | static int64_t qemu_next_alarm_deadline(void); |
740 | ||
db1a4972 | 741 | #ifdef _WIN32 |
68c23e55 | 742 | static void CALLBACK host_alarm_handler(PVOID lpParam, BOOLEAN unused) |
db1a4972 PB |
743 | #else |
744 | static void host_alarm_handler(int host_signum) | |
745 | #endif | |
746 | { | |
747 | struct qemu_alarm_timer *t = alarm_timer; | |
748 | if (!t) | |
749 | return; | |
750 | ||
751 | #if 0 | |
752 | #define DISP_FREQ 1000 | |
753 | { | |
754 | static int64_t delta_min = INT64_MAX; | |
755 | static int64_t delta_max, delta_cum, last_clock, delta, ti; | |
756 | static int count; | |
74475455 | 757 | ti = qemu_get_clock_ns(vm_clock); |
db1a4972 PB |
758 | if (last_clock != 0) { |
759 | delta = ti - last_clock; | |
760 | if (delta < delta_min) | |
761 | delta_min = delta; | |
762 | if (delta > delta_max) | |
763 | delta_max = delta; | |
764 | delta_cum += delta; | |
765 | if (++count == DISP_FREQ) { | |
766 | printf("timer: min=%" PRId64 " us max=%" PRId64 " us avg=%" PRId64 " us avg_freq=%0.3f Hz\n", | |
767 | muldiv64(delta_min, 1000000, get_ticks_per_sec()), | |
768 | muldiv64(delta_max, 1000000, get_ticks_per_sec()), | |
769 | muldiv64(delta_cum, 1000000 / DISP_FREQ, get_ticks_per_sec()), | |
770 | (double)get_ticks_per_sec() / ((double)delta_cum / DISP_FREQ)); | |
771 | count = 0; | |
772 | delta_min = INT64_MAX; | |
773 | delta_max = 0; | |
774 | delta_cum = 0; | |
775 | } | |
776 | } | |
777 | last_clock = ti; | |
778 | } | |
779 | #endif | |
780 | if (alarm_has_dynticks(t) || | |
4c3d45eb | 781 | qemu_next_alarm_deadline () <= 0) { |
db1a4972 PB |
782 | t->expired = alarm_has_dynticks(t); |
783 | t->pending = 1; | |
784 | qemu_notify_event(); | |
785 | } | |
786 | } | |
787 | ||
cb842c90 | 788 | int64_t qemu_next_icount_deadline(void) |
db1a4972 PB |
789 | { |
790 | /* To avoid problems with overflow limit this to 2^32. */ | |
791 | int64_t delta = INT32_MAX; | |
792 | ||
cb842c90 | 793 | assert(use_icount); |
db1a4972 PB |
794 | if (active_timers[QEMU_CLOCK_VIRTUAL]) { |
795 | delta = active_timers[QEMU_CLOCK_VIRTUAL]->expire_time - | |
9c13246a | 796 | qemu_get_clock_ns(vm_clock); |
db1a4972 | 797 | } |
db1a4972 PB |
798 | |
799 | if (delta < 0) | |
800 | delta = 0; | |
801 | ||
802 | return delta; | |
803 | } | |
804 | ||
4c3d45eb | 805 | static int64_t qemu_next_alarm_deadline(void) |
db1a4972 PB |
806 | { |
807 | int64_t delta; | |
808 | int64_t rtdelta; | |
809 | ||
6ad0a1ed PB |
810 | if (!use_icount && active_timers[QEMU_CLOCK_VIRTUAL]) { |
811 | delta = active_timers[QEMU_CLOCK_VIRTUAL]->expire_time - | |
74475455 | 812 | qemu_get_clock_ns(vm_clock); |
6ad0a1ed | 813 | } else { |
db1a4972 | 814 | delta = INT32_MAX; |
6ad0a1ed PB |
815 | } |
816 | if (active_timers[QEMU_CLOCK_HOST]) { | |
817 | int64_t hdelta = active_timers[QEMU_CLOCK_HOST]->expire_time - | |
818 | qemu_get_clock_ns(host_clock); | |
819 | if (hdelta < delta) | |
820 | delta = hdelta; | |
821 | } | |
db1a4972 | 822 | if (active_timers[QEMU_CLOCK_REALTIME]) { |
4a998740 | 823 | rtdelta = (active_timers[QEMU_CLOCK_REALTIME]->expire_time - |
9c13246a | 824 | qemu_get_clock_ns(rt_clock)); |
db1a4972 PB |
825 | if (rtdelta < delta) |
826 | delta = rtdelta; | |
827 | } | |
828 | ||
db1a4972 PB |
829 | return delta; |
830 | } | |
831 | ||
4c3d45eb PB |
832 | #if defined(__linux__) |
833 | ||
d25f89c9 JK |
834 | #include "compatfd.h" |
835 | ||
db1a4972 PB |
836 | static int dynticks_start_timer(struct qemu_alarm_timer *t) |
837 | { | |
838 | struct sigevent ev; | |
839 | timer_t host_timer; | |
840 | struct sigaction act; | |
841 | ||
842 | sigfillset(&act.sa_mask); | |
843 | act.sa_flags = 0; | |
844 | act.sa_handler = host_alarm_handler; | |
845 | ||
846 | sigaction(SIGALRM, &act, NULL); | |
847 | ||
848 | /* | |
849 | * Initialize ev struct to 0 to avoid valgrind complaining | |
850 | * about uninitialized data in timer_create call | |
851 | */ | |
852 | memset(&ev, 0, sizeof(ev)); | |
853 | ev.sigev_value.sival_int = 0; | |
854 | ev.sigev_notify = SIGEV_SIGNAL; | |
d25f89c9 JK |
855 | #ifdef SIGEV_THREAD_ID |
856 | if (qemu_signalfd_available()) { | |
857 | ev.sigev_notify = SIGEV_THREAD_ID; | |
858 | ev._sigev_un._tid = qemu_get_thread_id(); | |
859 | } | |
860 | #endif /* SIGEV_THREAD_ID */ | |
db1a4972 PB |
861 | ev.sigev_signo = SIGALRM; |
862 | ||
863 | if (timer_create(CLOCK_REALTIME, &ev, &host_timer)) { | |
864 | perror("timer_create"); | |
865 | ||
866 | /* disable dynticks */ | |
867 | fprintf(stderr, "Dynamic Ticks disabled\n"); | |
868 | ||
869 | return -1; | |
870 | } | |
871 | ||
cd0544ee | 872 | t->timer = host_timer; |
db1a4972 PB |
873 | |
874 | return 0; | |
875 | } | |
876 | ||
877 | static void dynticks_stop_timer(struct qemu_alarm_timer *t) | |
878 | { | |
cd0544ee | 879 | timer_t host_timer = t->timer; |
db1a4972 PB |
880 | |
881 | timer_delete(host_timer); | |
882 | } | |
883 | ||
884 | static void dynticks_rearm_timer(struct qemu_alarm_timer *t) | |
885 | { | |
cd0544ee | 886 | timer_t host_timer = t->timer; |
db1a4972 | 887 | struct itimerspec timeout; |
9c13246a PB |
888 | int64_t nearest_delta_ns = INT64_MAX; |
889 | int64_t current_ns; | |
db1a4972 PB |
890 | |
891 | assert(alarm_has_dynticks(t)); | |
892 | if (!active_timers[QEMU_CLOCK_REALTIME] && | |
893 | !active_timers[QEMU_CLOCK_VIRTUAL] && | |
894 | !active_timers[QEMU_CLOCK_HOST]) | |
895 | return; | |
896 | ||
4c3d45eb PB |
897 | nearest_delta_ns = qemu_next_alarm_deadline(); |
898 | if (nearest_delta_ns < MIN_TIMER_REARM_NS) | |
899 | nearest_delta_ns = MIN_TIMER_REARM_NS; | |
db1a4972 PB |
900 | |
901 | /* check whether a timer is already running */ | |
902 | if (timer_gettime(host_timer, &timeout)) { | |
903 | perror("gettime"); | |
904 | fprintf(stderr, "Internal timer error: aborting\n"); | |
905 | exit(1); | |
906 | } | |
9c13246a PB |
907 | current_ns = timeout.it_value.tv_sec * 1000000000LL + timeout.it_value.tv_nsec; |
908 | if (current_ns && current_ns <= nearest_delta_ns) | |
db1a4972 PB |
909 | return; |
910 | ||
911 | timeout.it_interval.tv_sec = 0; | |
912 | timeout.it_interval.tv_nsec = 0; /* 0 for one-shot timer */ | |
9c13246a PB |
913 | timeout.it_value.tv_sec = nearest_delta_ns / 1000000000; |
914 | timeout.it_value.tv_nsec = nearest_delta_ns % 1000000000; | |
db1a4972 PB |
915 | if (timer_settime(host_timer, 0 /* RELATIVE */, &timeout, NULL)) { |
916 | perror("settime"); | |
917 | fprintf(stderr, "Internal timer error: aborting\n"); | |
918 | exit(1); | |
919 | } | |
920 | } | |
921 | ||
922 | #endif /* defined(__linux__) */ | |
923 | ||
f26e5a54 SW |
924 | #if !defined(_WIN32) |
925 | ||
db1a4972 PB |
926 | static int unix_start_timer(struct qemu_alarm_timer *t) |
927 | { | |
928 | struct sigaction act; | |
db1a4972 PB |
929 | |
930 | /* timer signal */ | |
931 | sigfillset(&act.sa_mask); | |
932 | act.sa_flags = 0; | |
933 | act.sa_handler = host_alarm_handler; | |
934 | ||
935 | sigaction(SIGALRM, &act, NULL); | |
84682834 PB |
936 | return 0; |
937 | } | |
db1a4972 | 938 | |
84682834 PB |
939 | static void unix_rearm_timer(struct qemu_alarm_timer *t) |
940 | { | |
941 | struct itimerval itv; | |
942 | int64_t nearest_delta_ns = INT64_MAX; | |
943 | int err; | |
db1a4972 | 944 | |
84682834 PB |
945 | assert(alarm_has_dynticks(t)); |
946 | if (!active_timers[QEMU_CLOCK_REALTIME] && | |
947 | !active_timers[QEMU_CLOCK_VIRTUAL] && | |
948 | !active_timers[QEMU_CLOCK_HOST]) | |
949 | return; | |
db1a4972 | 950 | |
84682834 PB |
951 | nearest_delta_ns = qemu_next_alarm_deadline(); |
952 | if (nearest_delta_ns < MIN_TIMER_REARM_NS) | |
953 | nearest_delta_ns = MIN_TIMER_REARM_NS; | |
954 | ||
955 | itv.it_interval.tv_sec = 0; | |
956 | itv.it_interval.tv_usec = 0; /* 0 for one-shot timer */ | |
957 | itv.it_value.tv_sec = nearest_delta_ns / 1000000000; | |
958 | itv.it_value.tv_usec = (nearest_delta_ns % 1000000000) / 1000; | |
959 | err = setitimer(ITIMER_REAL, &itv, NULL); | |
960 | if (err) { | |
961 | perror("setitimer"); | |
962 | fprintf(stderr, "Internal timer error: aborting\n"); | |
963 | exit(1); | |
964 | } | |
db1a4972 PB |
965 | } |
966 | ||
967 | static void unix_stop_timer(struct qemu_alarm_timer *t) | |
968 | { | |
969 | struct itimerval itv; | |
970 | ||
971 | memset(&itv, 0, sizeof(itv)); | |
972 | setitimer(ITIMER_REAL, &itv, NULL); | |
973 | } | |
974 | ||
975 | #endif /* !defined(_WIN32) */ | |
976 | ||
977 | ||
978 | #ifdef _WIN32 | |
979 | ||
2f9cba0c SW |
980 | static MMRESULT mm_timer; |
981 | static unsigned mm_period; | |
982 | ||
983 | static void CALLBACK mm_alarm_handler(UINT uTimerID, UINT uMsg, | |
984 | DWORD_PTR dwUser, DWORD_PTR dw1, | |
985 | DWORD_PTR dw2) | |
986 | { | |
987 | struct qemu_alarm_timer *t = alarm_timer; | |
988 | if (!t) { | |
989 | return; | |
990 | } | |
991 | if (alarm_has_dynticks(t) || qemu_next_alarm_deadline() <= 0) { | |
992 | t->expired = alarm_has_dynticks(t); | |
993 | t->pending = 1; | |
994 | qemu_notify_event(); | |
995 | } | |
996 | } | |
997 | ||
998 | static int mm_start_timer(struct qemu_alarm_timer *t) | |
999 | { | |
1000 | TIMECAPS tc; | |
1001 | UINT flags; | |
1002 | ||
1003 | memset(&tc, 0, sizeof(tc)); | |
1004 | timeGetDevCaps(&tc, sizeof(tc)); | |
1005 | ||
1006 | mm_period = tc.wPeriodMin; | |
1007 | timeBeginPeriod(mm_period); | |
1008 | ||
1009 | flags = TIME_CALLBACK_FUNCTION; | |
1010 | if (alarm_has_dynticks(t)) { | |
1011 | flags |= TIME_ONESHOT; | |
1012 | } else { | |
1013 | flags |= TIME_PERIODIC; | |
1014 | } | |
1015 | ||
1016 | mm_timer = timeSetEvent(1, /* interval (ms) */ | |
1017 | mm_period, /* resolution */ | |
1018 | mm_alarm_handler, /* function */ | |
1019 | (DWORD_PTR)t, /* parameter */ | |
1020 | flags); | |
1021 | ||
1022 | if (!mm_timer) { | |
1023 | fprintf(stderr, "Failed to initialize win32 alarm timer: %ld\n", | |
1024 | GetLastError()); | |
1025 | timeEndPeriod(mm_period); | |
1026 | return -1; | |
1027 | } | |
1028 | ||
1029 | return 0; | |
1030 | } | |
1031 | ||
1032 | static void mm_stop_timer(struct qemu_alarm_timer *t) | |
1033 | { | |
1034 | timeKillEvent(mm_timer); | |
1035 | timeEndPeriod(mm_period); | |
1036 | } | |
1037 | ||
1038 | static void mm_rearm_timer(struct qemu_alarm_timer *t) | |
1039 | { | |
1040 | int nearest_delta_ms; | |
1041 | ||
1042 | assert(alarm_has_dynticks(t)); | |
1043 | if (!active_timers[QEMU_CLOCK_REALTIME] && | |
1044 | !active_timers[QEMU_CLOCK_VIRTUAL] && | |
1045 | !active_timers[QEMU_CLOCK_HOST]) { | |
1046 | return; | |
1047 | } | |
1048 | ||
1049 | timeKillEvent(mm_timer); | |
1050 | ||
1051 | nearest_delta_ms = (qemu_next_alarm_deadline() + 999999) / 1000000; | |
1052 | if (nearest_delta_ms < 1) { | |
1053 | nearest_delta_ms = 1; | |
1054 | } | |
1055 | mm_timer = timeSetEvent(nearest_delta_ms, | |
1056 | mm_period, | |
1057 | mm_alarm_handler, | |
1058 | (DWORD_PTR)t, | |
1059 | TIME_ONESHOT | TIME_CALLBACK_FUNCTION); | |
1060 | ||
1061 | if (!mm_timer) { | |
1062 | fprintf(stderr, "Failed to re-arm win32 alarm timer %ld\n", | |
1063 | GetLastError()); | |
1064 | ||
1065 | timeEndPeriod(mm_period); | |
1066 | exit(1); | |
1067 | } | |
1068 | } | |
1069 | ||
db1a4972 PB |
1070 | static int win32_start_timer(struct qemu_alarm_timer *t) |
1071 | { | |
68c23e55 PB |
1072 | HANDLE hTimer; |
1073 | BOOLEAN success; | |
1074 | ||
1075 | /* If you call ChangeTimerQueueTimer on a one-shot timer (its period | |
1076 | is zero) that has already expired, the timer is not updated. Since | |
1077 | creating a new timer is relatively expensive, set a bogus one-hour | |
1078 | interval in the dynticks case. */ | |
1079 | success = CreateTimerQueueTimer(&hTimer, | |
1080 | NULL, | |
1081 | host_alarm_handler, | |
1082 | t, | |
1083 | 1, | |
1084 | alarm_has_dynticks(t) ? 3600000 : 1, | |
1085 | WT_EXECUTEINTIMERTHREAD); | |
1086 | ||
1087 | if (!success) { | |
db1a4972 PB |
1088 | fprintf(stderr, "Failed to initialize win32 alarm timer: %ld\n", |
1089 | GetLastError()); | |
db1a4972 PB |
1090 | return -1; |
1091 | } | |
1092 | ||
cd0544ee | 1093 | t->timer = hTimer; |
db1a4972 PB |
1094 | return 0; |
1095 | } | |
1096 | ||
1097 | static void win32_stop_timer(struct qemu_alarm_timer *t) | |
1098 | { | |
cd0544ee | 1099 | HANDLE hTimer = t->timer; |
db1a4972 | 1100 | |
68c23e55 PB |
1101 | if (hTimer) { |
1102 | DeleteTimerQueueTimer(NULL, hTimer, NULL); | |
1103 | } | |
db1a4972 PB |
1104 | } |
1105 | ||
1106 | static void win32_rearm_timer(struct qemu_alarm_timer *t) | |
1107 | { | |
cd0544ee | 1108 | HANDLE hTimer = t->timer; |
cfced5b2 | 1109 | int nearest_delta_ms; |
68c23e55 | 1110 | BOOLEAN success; |
db1a4972 PB |
1111 | |
1112 | assert(alarm_has_dynticks(t)); | |
1113 | if (!active_timers[QEMU_CLOCK_REALTIME] && | |
1114 | !active_timers[QEMU_CLOCK_VIRTUAL] && | |
1115 | !active_timers[QEMU_CLOCK_HOST]) | |
1116 | return; | |
1117 | ||
cfced5b2 PB |
1118 | nearest_delta_ms = (qemu_next_alarm_deadline() + 999999) / 1000000; |
1119 | if (nearest_delta_ms < 1) { | |
1120 | nearest_delta_ms = 1; | |
1121 | } | |
68c23e55 PB |
1122 | success = ChangeTimerQueueTimer(NULL, |
1123 | hTimer, | |
1124 | nearest_delta_ms, | |
1125 | 3600000); | |
db1a4972 | 1126 | |
68c23e55 PB |
1127 | if (!success) { |
1128 | fprintf(stderr, "Failed to rearm win32 alarm timer: %ld\n", | |
1129 | GetLastError()); | |
1130 | exit(-1); | |
db1a4972 | 1131 | } |
68c23e55 | 1132 | |
db1a4972 PB |
1133 | } |
1134 | ||
1135 | #endif /* _WIN32 */ | |
1136 | ||
1137 | static void alarm_timer_on_change_state_rearm(void *opaque, int running, int reason) | |
1138 | { | |
1139 | if (running) | |
1140 | qemu_rearm_alarm_timer((struct qemu_alarm_timer *) opaque); | |
1141 | } | |
1142 | ||
1143 | int init_timer_alarm(void) | |
1144 | { | |
1145 | struct qemu_alarm_timer *t = NULL; | |
1146 | int i, err = -1; | |
1147 | ||
1148 | for (i = 0; alarm_timers[i].name; i++) { | |
1149 | t = &alarm_timers[i]; | |
1150 | ||
1151 | err = t->start(t); | |
1152 | if (!err) | |
1153 | break; | |
1154 | } | |
1155 | ||
1156 | if (err) { | |
1157 | err = -ENOENT; | |
1158 | goto fail; | |
1159 | } | |
1160 | ||
1161 | /* first event is at time 0 */ | |
1162 | t->pending = 1; | |
1163 | alarm_timer = t; | |
1164 | qemu_add_vm_change_state_handler(alarm_timer_on_change_state_rearm, t); | |
1165 | ||
1166 | return 0; | |
1167 | ||
1168 | fail: | |
1169 | return err; | |
1170 | } | |
1171 | ||
1172 | void quit_timers(void) | |
1173 | { | |
1174 | struct qemu_alarm_timer *t = alarm_timer; | |
1175 | alarm_timer = NULL; | |
1176 | t->stop(t); | |
1177 | } | |
1178 | ||
1179 | int qemu_calculate_timeout(void) | |
1180 | { | |
1ece93a9 | 1181 | #ifndef CONFIG_IOTHREAD |
db1a4972 PB |
1182 | int timeout; |
1183 | ||
1ece93a9 PB |
1184 | if (!vm_running) |
1185 | timeout = 5000; | |
1186 | else { | |
1187 | /* XXX: use timeout computed from timers */ | |
1188 | int64_t add; | |
1189 | int64_t delta; | |
1190 | /* Advance virtual time to the next event. */ | |
1191 | delta = qemu_icount_delta(); | |
1192 | if (delta > 0) { | |
1193 | /* If virtual time is ahead of real time then just | |
1194 | wait for IO. */ | |
1195 | timeout = (delta + 999999) / 1000000; | |
1196 | } else { | |
1197 | /* Wait for either IO to occur or the next | |
1198 | timer event. */ | |
cb842c90 | 1199 | add = qemu_next_icount_deadline(); |
1ece93a9 PB |
1200 | /* We advance the timer before checking for IO. |
1201 | Limit the amount we advance so that early IO | |
1202 | activity won't get the guest too far ahead. */ | |
1203 | if (add > 10000000) | |
1204 | add = 10000000; | |
1205 | delta += add; | |
1206 | qemu_icount += qemu_icount_round (add); | |
1207 | timeout = delta / 1000000; | |
1208 | if (timeout < 0) | |
1209 | timeout = 0; | |
1210 | } | |
db1a4972 PB |
1211 | } |
1212 | ||
1213 | return timeout; | |
1ece93a9 PB |
1214 | #else /* CONFIG_IOTHREAD */ |
1215 | return 1000; | |
1216 | #endif | |
db1a4972 PB |
1217 | } |
1218 |