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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 PB |
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 | ||
db1a4972 | 56 | #include "qemu-timer.h" |
db1a4972 PB |
57 | |
58 | /* Conversion factor from emulated instructions to virtual clock ticks. */ | |
29e922b6 | 59 | int icount_time_shift; |
db1a4972 PB |
60 | /* Arbitrarily pick 1MIPS as the minimum allowable speed. */ |
61 | #define MAX_ICOUNT_SHIFT 10 | |
62 | /* Compensate for varying guest execution speed. */ | |
29e922b6 | 63 | int64_t qemu_icount_bias; |
db1a4972 PB |
64 | static QEMUTimer *icount_rt_timer; |
65 | static QEMUTimer *icount_vm_timer; | |
66 | ||
db1a4972 PB |
67 | /***********************************************************/ |
68 | /* guest cycle counter */ | |
69 | ||
70 | typedef struct TimersState { | |
71 | int64_t cpu_ticks_prev; | |
72 | int64_t cpu_ticks_offset; | |
73 | int64_t cpu_clock_offset; | |
74 | int32_t cpu_ticks_enabled; | |
75 | int64_t dummy; | |
76 | } TimersState; | |
77 | ||
78 | TimersState timers_state; | |
79 | ||
80 | /* return the host CPU cycle counter and handle stop/restart */ | |
81 | int64_t cpu_get_ticks(void) | |
82 | { | |
83 | if (use_icount) { | |
84 | return cpu_get_icount(); | |
85 | } | |
86 | if (!timers_state.cpu_ticks_enabled) { | |
87 | return timers_state.cpu_ticks_offset; | |
88 | } else { | |
89 | int64_t ticks; | |
90 | ticks = cpu_get_real_ticks(); | |
91 | if (timers_state.cpu_ticks_prev > ticks) { | |
92 | /* Note: non increasing ticks may happen if the host uses | |
93 | software suspend */ | |
94 | timers_state.cpu_ticks_offset += timers_state.cpu_ticks_prev - ticks; | |
95 | } | |
96 | timers_state.cpu_ticks_prev = ticks; | |
97 | return ticks + timers_state.cpu_ticks_offset; | |
98 | } | |
99 | } | |
100 | ||
101 | /* return the host CPU monotonic timer and handle stop/restart */ | |
102 | static int64_t cpu_get_clock(void) | |
103 | { | |
104 | int64_t ti; | |
105 | if (!timers_state.cpu_ticks_enabled) { | |
106 | return timers_state.cpu_clock_offset; | |
107 | } else { | |
108 | ti = get_clock(); | |
109 | return ti + timers_state.cpu_clock_offset; | |
110 | } | |
111 | } | |
112 | ||
1ece93a9 | 113 | #ifndef CONFIG_IOTHREAD |
db1a4972 PB |
114 | static int64_t qemu_icount_delta(void) |
115 | { | |
1ece93a9 PB |
116 | if (!use_icount) { |
117 | return 5000 * (int64_t) 1000000; | |
118 | } else if (use_icount == 1) { | |
db1a4972 PB |
119 | /* When not using an adaptive execution frequency |
120 | we tend to get badly out of sync with real time, | |
121 | so just delay for a reasonable amount of time. */ | |
122 | return 0; | |
123 | } else { | |
124 | return cpu_get_icount() - cpu_get_clock(); | |
125 | } | |
126 | } | |
1ece93a9 | 127 | #endif |
db1a4972 PB |
128 | |
129 | /* enable cpu_get_ticks() */ | |
130 | void cpu_enable_ticks(void) | |
131 | { | |
132 | if (!timers_state.cpu_ticks_enabled) { | |
133 | timers_state.cpu_ticks_offset -= cpu_get_real_ticks(); | |
134 | timers_state.cpu_clock_offset -= get_clock(); | |
135 | timers_state.cpu_ticks_enabled = 1; | |
136 | } | |
137 | } | |
138 | ||
139 | /* disable cpu_get_ticks() : the clock is stopped. You must not call | |
140 | cpu_get_ticks() after that. */ | |
141 | void cpu_disable_ticks(void) | |
142 | { | |
143 | if (timers_state.cpu_ticks_enabled) { | |
144 | timers_state.cpu_ticks_offset = cpu_get_ticks(); | |
145 | timers_state.cpu_clock_offset = cpu_get_clock(); | |
146 | timers_state.cpu_ticks_enabled = 0; | |
147 | } | |
148 | } | |
149 | ||
150 | /***********************************************************/ | |
151 | /* timers */ | |
152 | ||
153 | #define QEMU_CLOCK_REALTIME 0 | |
154 | #define QEMU_CLOCK_VIRTUAL 1 | |
155 | #define QEMU_CLOCK_HOST 2 | |
156 | ||
157 | struct QEMUClock { | |
158 | int type; | |
159 | int enabled; | |
ab33fcda PB |
160 | |
161 | QEMUTimer *warp_timer; | |
db1a4972 PB |
162 | }; |
163 | ||
164 | struct QEMUTimer { | |
165 | QEMUClock *clock; | |
4a998740 PB |
166 | int64_t expire_time; /* in nanoseconds */ |
167 | int scale; | |
db1a4972 PB |
168 | QEMUTimerCB *cb; |
169 | void *opaque; | |
170 | struct QEMUTimer *next; | |
171 | }; | |
172 | ||
173 | struct qemu_alarm_timer { | |
174 | char const *name; | |
175 | int (*start)(struct qemu_alarm_timer *t); | |
176 | void (*stop)(struct qemu_alarm_timer *t); | |
177 | void (*rearm)(struct qemu_alarm_timer *t); | |
cd0544ee SW |
178 | #if defined(__linux__) |
179 | int fd; | |
180 | timer_t timer; | |
181 | #elif defined(_WIN32) | |
182 | HANDLE timer; | |
183 | #endif | |
db1a4972 PB |
184 | char expired; |
185 | char pending; | |
186 | }; | |
187 | ||
188 | static struct qemu_alarm_timer *alarm_timer; | |
189 | ||
45c7b37f SW |
190 | static bool qemu_timer_expired_ns(QEMUTimer *timer_head, int64_t current_time) |
191 | { | |
192 | return timer_head && (timer_head->expire_time <= current_time); | |
193 | } | |
194 | ||
db1a4972 PB |
195 | int qemu_alarm_pending(void) |
196 | { | |
197 | return alarm_timer->pending; | |
198 | } | |
199 | ||
200 | static inline int alarm_has_dynticks(struct qemu_alarm_timer *t) | |
201 | { | |
202 | return !!t->rearm; | |
203 | } | |
204 | ||
205 | static void qemu_rearm_alarm_timer(struct qemu_alarm_timer *t) | |
206 | { | |
207 | if (!alarm_has_dynticks(t)) | |
208 | return; | |
209 | ||
210 | t->rearm(t); | |
211 | } | |
212 | ||
9c13246a PB |
213 | /* TODO: MIN_TIMER_REARM_NS should be optimized */ |
214 | #define MIN_TIMER_REARM_NS 250000 | |
db1a4972 PB |
215 | |
216 | #ifdef _WIN32 | |
217 | ||
2f9cba0c SW |
218 | static int mm_start_timer(struct qemu_alarm_timer *t); |
219 | static void mm_stop_timer(struct qemu_alarm_timer *t); | |
220 | static void mm_rearm_timer(struct qemu_alarm_timer *t); | |
221 | ||
db1a4972 PB |
222 | static int win32_start_timer(struct qemu_alarm_timer *t); |
223 | static void win32_stop_timer(struct qemu_alarm_timer *t); | |
224 | static void win32_rearm_timer(struct qemu_alarm_timer *t); | |
225 | ||
226 | #else | |
227 | ||
228 | static int unix_start_timer(struct qemu_alarm_timer *t); | |
229 | static void unix_stop_timer(struct qemu_alarm_timer *t); | |
230 | ||
231 | #ifdef __linux__ | |
232 | ||
233 | static int dynticks_start_timer(struct qemu_alarm_timer *t); | |
234 | static void dynticks_stop_timer(struct qemu_alarm_timer *t); | |
235 | static void dynticks_rearm_timer(struct qemu_alarm_timer *t); | |
236 | ||
237 | static int hpet_start_timer(struct qemu_alarm_timer *t); | |
238 | static void hpet_stop_timer(struct qemu_alarm_timer *t); | |
239 | ||
240 | static int rtc_start_timer(struct qemu_alarm_timer *t); | |
241 | static void rtc_stop_timer(struct qemu_alarm_timer *t); | |
242 | ||
243 | #endif /* __linux__ */ | |
244 | ||
245 | #endif /* _WIN32 */ | |
246 | ||
247 | /* Correlation between real and virtual time is always going to be | |
248 | fairly approximate, so ignore small variation. | |
249 | When the guest is idle real and virtual time will be aligned in | |
250 | the IO wait loop. */ | |
251 | #define ICOUNT_WOBBLE (get_ticks_per_sec() / 10) | |
252 | ||
253 | static void icount_adjust(void) | |
254 | { | |
255 | int64_t cur_time; | |
256 | int64_t cur_icount; | |
257 | int64_t delta; | |
258 | static int64_t last_delta; | |
259 | /* If the VM is not running, then do nothing. */ | |
260 | if (!vm_running) | |
261 | return; | |
262 | ||
263 | cur_time = cpu_get_clock(); | |
74475455 | 264 | cur_icount = qemu_get_clock_ns(vm_clock); |
db1a4972 PB |
265 | delta = cur_icount - cur_time; |
266 | /* FIXME: This is a very crude algorithm, somewhat prone to oscillation. */ | |
267 | if (delta > 0 | |
268 | && last_delta + ICOUNT_WOBBLE < delta * 2 | |
269 | && icount_time_shift > 0) { | |
270 | /* The guest is getting too far ahead. Slow time down. */ | |
271 | icount_time_shift--; | |
272 | } | |
273 | if (delta < 0 | |
274 | && last_delta - ICOUNT_WOBBLE > delta * 2 | |
275 | && icount_time_shift < MAX_ICOUNT_SHIFT) { | |
276 | /* The guest is getting too far behind. Speed time up. */ | |
277 | icount_time_shift++; | |
278 | } | |
279 | last_delta = delta; | |
280 | qemu_icount_bias = cur_icount - (qemu_icount << icount_time_shift); | |
281 | } | |
282 | ||
283 | static void icount_adjust_rt(void * opaque) | |
284 | { | |
285 | qemu_mod_timer(icount_rt_timer, | |
7bd427d8 | 286 | qemu_get_clock_ms(rt_clock) + 1000); |
db1a4972 PB |
287 | icount_adjust(); |
288 | } | |
289 | ||
290 | static void icount_adjust_vm(void * opaque) | |
291 | { | |
292 | qemu_mod_timer(icount_vm_timer, | |
74475455 | 293 | qemu_get_clock_ns(vm_clock) + get_ticks_per_sec() / 10); |
db1a4972 PB |
294 | icount_adjust(); |
295 | } | |
296 | ||
297 | int64_t qemu_icount_round(int64_t count) | |
298 | { | |
299 | return (count + (1 << icount_time_shift) - 1) >> icount_time_shift; | |
300 | } | |
301 | ||
302 | static struct qemu_alarm_timer alarm_timers[] = { | |
303 | #ifndef _WIN32 | |
304 | #ifdef __linux__ | |
305 | {"dynticks", dynticks_start_timer, | |
cd0544ee | 306 | dynticks_stop_timer, dynticks_rearm_timer}, |
db1a4972 | 307 | /* HPET - if available - is preferred */ |
cd0544ee | 308 | {"hpet", hpet_start_timer, hpet_stop_timer, NULL}, |
db1a4972 | 309 | /* ...otherwise try RTC */ |
cd0544ee | 310 | {"rtc", rtc_start_timer, rtc_stop_timer, NULL}, |
db1a4972 | 311 | #endif |
cd0544ee | 312 | {"unix", unix_start_timer, unix_stop_timer, NULL}, |
db1a4972 | 313 | #else |
2f9cba0c SW |
314 | {"mmtimer", mm_start_timer, mm_stop_timer, NULL}, |
315 | {"mmtimer2", mm_start_timer, mm_stop_timer, mm_rearm_timer}, | |
cd0544ee SW |
316 | {"dynticks", win32_start_timer, win32_stop_timer, win32_rearm_timer}, |
317 | {"win32", win32_start_timer, win32_stop_timer, NULL}, | |
db1a4972 PB |
318 | #endif |
319 | {NULL, } | |
320 | }; | |
321 | ||
322 | static void show_available_alarms(void) | |
323 | { | |
324 | int i; | |
325 | ||
326 | printf("Available alarm timers, in order of precedence:\n"); | |
327 | for (i = 0; alarm_timers[i].name; i++) | |
328 | printf("%s\n", alarm_timers[i].name); | |
329 | } | |
330 | ||
331 | void configure_alarms(char const *opt) | |
332 | { | |
333 | int i; | |
334 | int cur = 0; | |
335 | int count = ARRAY_SIZE(alarm_timers) - 1; | |
336 | char *arg; | |
337 | char *name; | |
338 | struct qemu_alarm_timer tmp; | |
339 | ||
340 | if (!strcmp(opt, "?")) { | |
341 | show_available_alarms(); | |
342 | exit(0); | |
343 | } | |
344 | ||
345 | arg = qemu_strdup(opt); | |
346 | ||
347 | /* Reorder the array */ | |
348 | name = strtok(arg, ","); | |
349 | while (name) { | |
350 | for (i = 0; i < count && alarm_timers[i].name; i++) { | |
351 | if (!strcmp(alarm_timers[i].name, name)) | |
352 | break; | |
353 | } | |
354 | ||
355 | if (i == count) { | |
356 | fprintf(stderr, "Unknown clock %s\n", name); | |
357 | goto next; | |
358 | } | |
359 | ||
360 | if (i < cur) | |
361 | /* Ignore */ | |
362 | goto next; | |
363 | ||
364 | /* Swap */ | |
365 | tmp = alarm_timers[i]; | |
366 | alarm_timers[i] = alarm_timers[cur]; | |
367 | alarm_timers[cur] = tmp; | |
368 | ||
369 | cur++; | |
370 | next: | |
371 | name = strtok(NULL, ","); | |
372 | } | |
373 | ||
374 | qemu_free(arg); | |
375 | ||
376 | if (cur) { | |
377 | /* Disable remaining timers */ | |
378 | for (i = cur; i < count; i++) | |
379 | alarm_timers[i].name = NULL; | |
380 | } else { | |
381 | show_available_alarms(); | |
382 | exit(1); | |
383 | } | |
384 | } | |
385 | ||
386 | #define QEMU_NUM_CLOCKS 3 | |
387 | ||
388 | QEMUClock *rt_clock; | |
389 | QEMUClock *vm_clock; | |
390 | QEMUClock *host_clock; | |
391 | ||
392 | static QEMUTimer *active_timers[QEMU_NUM_CLOCKS]; | |
393 | ||
394 | static QEMUClock *qemu_new_clock(int type) | |
395 | { | |
396 | QEMUClock *clock; | |
397 | clock = qemu_mallocz(sizeof(QEMUClock)); | |
398 | clock->type = type; | |
399 | clock->enabled = 1; | |
400 | return clock; | |
401 | } | |
402 | ||
403 | void qemu_clock_enable(QEMUClock *clock, int enabled) | |
404 | { | |
405 | clock->enabled = enabled; | |
406 | } | |
407 | ||
ab33fcda PB |
408 | static int64_t vm_clock_warp_start; |
409 | ||
410 | static void icount_warp_rt(void *opaque) | |
411 | { | |
412 | if (vm_clock_warp_start == -1) { | |
413 | return; | |
414 | } | |
415 | ||
416 | if (vm_running) { | |
417 | int64_t clock = qemu_get_clock_ns(rt_clock); | |
418 | int64_t warp_delta = clock - vm_clock_warp_start; | |
419 | if (use_icount == 1) { | |
420 | qemu_icount_bias += warp_delta; | |
421 | } else { | |
422 | /* | |
423 | * In adaptive mode, do not let the vm_clock run too | |
424 | * far ahead of real time. | |
425 | */ | |
426 | int64_t cur_time = cpu_get_clock(); | |
427 | int64_t cur_icount = qemu_get_clock_ns(vm_clock); | |
428 | int64_t delta = cur_time - cur_icount; | |
429 | qemu_icount_bias += MIN(warp_delta, delta); | |
430 | } | |
431 | if (qemu_timer_expired(active_timers[QEMU_CLOCK_VIRTUAL], | |
432 | qemu_get_clock_ns(vm_clock))) { | |
433 | qemu_notify_event(); | |
434 | } | |
435 | } | |
436 | vm_clock_warp_start = -1; | |
437 | } | |
438 | ||
439 | void qemu_clock_warp(QEMUClock *clock) | |
440 | { | |
441 | int64_t deadline; | |
442 | ||
443 | if (!clock->warp_timer) { | |
444 | return; | |
445 | } | |
446 | ||
447 | /* | |
448 | * There are too many global variables to make the "warp" behavior | |
449 | * applicable to other clocks. But a clock argument removes the | |
450 | * need for if statements all over the place. | |
451 | */ | |
452 | assert(clock == vm_clock); | |
453 | ||
454 | /* | |
455 | * If the CPUs have been sleeping, advance the vm_clock timer now. This | |
456 | * ensures that the deadline for the timer is computed correctly below. | |
457 | * This also makes sure that the insn counter is synchronized before the | |
458 | * CPU starts running, in case the CPU is woken by an event other than | |
459 | * the earliest vm_clock timer. | |
460 | */ | |
461 | icount_warp_rt(NULL); | |
462 | if (!all_cpu_threads_idle() || !active_timers[clock->type]) { | |
463 | qemu_del_timer(clock->warp_timer); | |
464 | return; | |
465 | } | |
466 | ||
467 | vm_clock_warp_start = qemu_get_clock_ns(rt_clock); | |
cb842c90 | 468 | deadline = qemu_next_icount_deadline(); |
ab33fcda PB |
469 | if (deadline > 0) { |
470 | /* | |
471 | * Ensure the vm_clock proceeds even when the virtual CPU goes to | |
472 | * sleep. Otherwise, the CPU might be waiting for a future timer | |
473 | * interrupt to wake it up, but the interrupt never comes because | |
474 | * the vCPU isn't running any insns and thus doesn't advance the | |
475 | * vm_clock. | |
476 | * | |
477 | * An extreme solution for this problem would be to never let VCPUs | |
478 | * sleep in icount mode if there is a pending vm_clock timer; rather | |
479 | * time could just advance to the next vm_clock event. Instead, we | |
480 | * do stop VCPUs and only advance vm_clock after some "real" time, | |
481 | * (related to the time left until the next event) has passed. This | |
482 | * rt_clock timer will do this. This avoids that the warps are too | |
483 | * visible externally---for example, you will not be sending network | |
484 | * packets continously instead of every 100ms. | |
485 | */ | |
486 | qemu_mod_timer(clock->warp_timer, vm_clock_warp_start + deadline); | |
487 | } else { | |
488 | qemu_notify_event(); | |
489 | } | |
490 | } | |
491 | ||
4a998740 PB |
492 | QEMUTimer *qemu_new_timer(QEMUClock *clock, int scale, |
493 | QEMUTimerCB *cb, void *opaque) | |
db1a4972 PB |
494 | { |
495 | QEMUTimer *ts; | |
496 | ||
497 | ts = qemu_mallocz(sizeof(QEMUTimer)); | |
498 | ts->clock = clock; | |
499 | ts->cb = cb; | |
500 | ts->opaque = opaque; | |
4a998740 | 501 | ts->scale = scale; |
db1a4972 PB |
502 | return ts; |
503 | } | |
504 | ||
505 | void qemu_free_timer(QEMUTimer *ts) | |
506 | { | |
507 | qemu_free(ts); | |
508 | } | |
509 | ||
510 | /* stop a timer, but do not dealloc it */ | |
511 | void qemu_del_timer(QEMUTimer *ts) | |
512 | { | |
513 | QEMUTimer **pt, *t; | |
514 | ||
515 | /* NOTE: this code must be signal safe because | |
516 | qemu_timer_expired() can be called from a signal. */ | |
517 | pt = &active_timers[ts->clock->type]; | |
518 | for(;;) { | |
519 | t = *pt; | |
520 | if (!t) | |
521 | break; | |
522 | if (t == ts) { | |
523 | *pt = t->next; | |
524 | break; | |
525 | } | |
526 | pt = &t->next; | |
527 | } | |
528 | } | |
529 | ||
530 | /* modify the current timer so that it will be fired when current_time | |
531 | >= expire_time. The corresponding callback will be called. */ | |
4a998740 | 532 | static void qemu_mod_timer_ns(QEMUTimer *ts, int64_t expire_time) |
db1a4972 PB |
533 | { |
534 | QEMUTimer **pt, *t; | |
535 | ||
536 | qemu_del_timer(ts); | |
537 | ||
538 | /* add the timer in the sorted list */ | |
539 | /* NOTE: this code must be signal safe because | |
540 | qemu_timer_expired() can be called from a signal. */ | |
541 | pt = &active_timers[ts->clock->type]; | |
542 | for(;;) { | |
543 | t = *pt; | |
45c7b37f | 544 | if (!qemu_timer_expired_ns(t, expire_time)) { |
db1a4972 | 545 | break; |
45c7b37f | 546 | } |
db1a4972 PB |
547 | pt = &t->next; |
548 | } | |
549 | ts->expire_time = expire_time; | |
550 | ts->next = *pt; | |
551 | *pt = ts; | |
552 | ||
553 | /* Rearm if necessary */ | |
554 | if (pt == &active_timers[ts->clock->type]) { | |
555 | if (!alarm_timer->pending) { | |
556 | qemu_rearm_alarm_timer(alarm_timer); | |
557 | } | |
558 | /* Interrupt execution to force deadline recalculation. */ | |
ab33fcda PB |
559 | qemu_clock_warp(ts->clock); |
560 | if (use_icount) { | |
db1a4972 | 561 | qemu_notify_event(); |
ab33fcda | 562 | } |
db1a4972 PB |
563 | } |
564 | } | |
565 | ||
4a998740 PB |
566 | /* modify the current timer so that it will be fired when current_time |
567 | >= expire_time. The corresponding callback will be called. */ | |
568 | void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time) | |
569 | { | |
570 | qemu_mod_timer_ns(ts, expire_time * ts->scale); | |
571 | } | |
572 | ||
db1a4972 PB |
573 | int qemu_timer_pending(QEMUTimer *ts) |
574 | { | |
575 | QEMUTimer *t; | |
576 | for(t = active_timers[ts->clock->type]; t != NULL; t = t->next) { | |
577 | if (t == ts) | |
578 | return 1; | |
579 | } | |
580 | return 0; | |
581 | } | |
582 | ||
583 | int qemu_timer_expired(QEMUTimer *timer_head, int64_t current_time) | |
584 | { | |
45c7b37f | 585 | return qemu_timer_expired_ns(timer_head, current_time * timer_head->scale); |
db1a4972 PB |
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 | ||
4a998740 | 596 | current_time = qemu_get_clock_ns(clock); |
db1a4972 PB |
597 | ptimer_head = &active_timers[clock->type]; |
598 | for(;;) { | |
599 | ts = *ptimer_head; | |
45c7b37f | 600 | if (!qemu_timer_expired_ns(ts, current_time)) { |
db1a4972 | 601 | break; |
45c7b37f | 602 | } |
db1a4972 PB |
603 | /* remove timer from the list before calling the callback */ |
604 | *ptimer_head = ts->next; | |
605 | ts->next = NULL; | |
606 | ||
607 | /* run the callback (the timer list can be modified) */ | |
608 | ts->cb(ts->opaque); | |
609 | } | |
610 | } | |
611 | ||
db1a4972 PB |
612 | int64_t qemu_get_clock_ns(QEMUClock *clock) |
613 | { | |
614 | switch(clock->type) { | |
615 | case QEMU_CLOCK_REALTIME: | |
616 | return get_clock(); | |
617 | default: | |
618 | case QEMU_CLOCK_VIRTUAL: | |
619 | if (use_icount) { | |
620 | return cpu_get_icount(); | |
621 | } else { | |
622 | return cpu_get_clock(); | |
623 | } | |
624 | case QEMU_CLOCK_HOST: | |
625 | return get_clock_realtime(); | |
626 | } | |
627 | } | |
628 | ||
629 | void init_clocks(void) | |
630 | { | |
db1a4972 PB |
631 | rt_clock = qemu_new_clock(QEMU_CLOCK_REALTIME); |
632 | vm_clock = qemu_new_clock(QEMU_CLOCK_VIRTUAL); | |
633 | host_clock = qemu_new_clock(QEMU_CLOCK_HOST); | |
634 | ||
635 | rtc_clock = host_clock; | |
636 | } | |
637 | ||
638 | /* save a timer */ | |
639 | void qemu_put_timer(QEMUFile *f, QEMUTimer *ts) | |
640 | { | |
641 | uint64_t expire_time; | |
642 | ||
643 | if (qemu_timer_pending(ts)) { | |
644 | expire_time = ts->expire_time; | |
645 | } else { | |
646 | expire_time = -1; | |
647 | } | |
648 | qemu_put_be64(f, expire_time); | |
649 | } | |
650 | ||
651 | void qemu_get_timer(QEMUFile *f, QEMUTimer *ts) | |
652 | { | |
653 | uint64_t expire_time; | |
654 | ||
655 | expire_time = qemu_get_be64(f); | |
656 | if (expire_time != -1) { | |
4a998740 | 657 | qemu_mod_timer_ns(ts, expire_time); |
db1a4972 PB |
658 | } else { |
659 | qemu_del_timer(ts); | |
660 | } | |
661 | } | |
662 | ||
663 | static const VMStateDescription vmstate_timers = { | |
664 | .name = "timer", | |
665 | .version_id = 2, | |
666 | .minimum_version_id = 1, | |
667 | .minimum_version_id_old = 1, | |
668 | .fields = (VMStateField []) { | |
669 | VMSTATE_INT64(cpu_ticks_offset, TimersState), | |
670 | VMSTATE_INT64(dummy, TimersState), | |
671 | VMSTATE_INT64_V(cpu_clock_offset, TimersState, 2), | |
672 | VMSTATE_END_OF_LIST() | |
673 | } | |
674 | }; | |
675 | ||
676 | void configure_icount(const char *option) | |
677 | { | |
0be71e32 | 678 | vmstate_register(NULL, 0, &vmstate_timers, &timers_state); |
db1a4972 PB |
679 | if (!option) |
680 | return; | |
681 | ||
ab33fcda PB |
682 | #ifdef CONFIG_IOTHREAD |
683 | vm_clock->warp_timer = qemu_new_timer_ns(rt_clock, icount_warp_rt, NULL); | |
684 | #endif | |
685 | ||
db1a4972 PB |
686 | if (strcmp(option, "auto") != 0) { |
687 | icount_time_shift = strtol(option, NULL, 0); | |
688 | use_icount = 1; | |
689 | return; | |
690 | } | |
691 | ||
692 | use_icount = 2; | |
693 | ||
694 | /* 125MIPS seems a reasonable initial guess at the guest speed. | |
695 | It will be corrected fairly quickly anyway. */ | |
696 | icount_time_shift = 3; | |
697 | ||
698 | /* Have both realtime and virtual time triggers for speed adjustment. | |
699 | The realtime trigger catches emulated time passing too slowly, | |
700 | the virtual time trigger catches emulated time passing too fast. | |
701 | Realtime triggers occur even when idle, so use them less frequently | |
702 | than VM triggers. */ | |
7bd427d8 | 703 | icount_rt_timer = qemu_new_timer_ms(rt_clock, icount_adjust_rt, NULL); |
db1a4972 | 704 | qemu_mod_timer(icount_rt_timer, |
7bd427d8 | 705 | qemu_get_clock_ms(rt_clock) + 1000); |
74475455 | 706 | icount_vm_timer = qemu_new_timer_ns(vm_clock, icount_adjust_vm, NULL); |
db1a4972 | 707 | qemu_mod_timer(icount_vm_timer, |
74475455 | 708 | qemu_get_clock_ns(vm_clock) + get_ticks_per_sec() / 10); |
db1a4972 PB |
709 | } |
710 | ||
711 | void qemu_run_all_timers(void) | |
712 | { | |
ca5a2a4b PB |
713 | alarm_timer->pending = 0; |
714 | ||
db1a4972 PB |
715 | /* rearm timer, if not periodic */ |
716 | if (alarm_timer->expired) { | |
717 | alarm_timer->expired = 0; | |
718 | qemu_rearm_alarm_timer(alarm_timer); | |
719 | } | |
720 | ||
db1a4972 PB |
721 | /* vm time timers */ |
722 | if (vm_running) { | |
723 | qemu_run_timers(vm_clock); | |
724 | } | |
725 | ||
726 | qemu_run_timers(rt_clock); | |
727 | qemu_run_timers(host_clock); | |
728 | } | |
729 | ||
4c3d45eb PB |
730 | static int64_t qemu_next_alarm_deadline(void); |
731 | ||
db1a4972 | 732 | #ifdef _WIN32 |
68c23e55 | 733 | static void CALLBACK host_alarm_handler(PVOID lpParam, BOOLEAN unused) |
db1a4972 PB |
734 | #else |
735 | static void host_alarm_handler(int host_signum) | |
736 | #endif | |
737 | { | |
738 | struct qemu_alarm_timer *t = alarm_timer; | |
739 | if (!t) | |
740 | return; | |
741 | ||
742 | #if 0 | |
743 | #define DISP_FREQ 1000 | |
744 | { | |
745 | static int64_t delta_min = INT64_MAX; | |
746 | static int64_t delta_max, delta_cum, last_clock, delta, ti; | |
747 | static int count; | |
74475455 | 748 | ti = qemu_get_clock_ns(vm_clock); |
db1a4972 PB |
749 | if (last_clock != 0) { |
750 | delta = ti - last_clock; | |
751 | if (delta < delta_min) | |
752 | delta_min = delta; | |
753 | if (delta > delta_max) | |
754 | delta_max = delta; | |
755 | delta_cum += delta; | |
756 | if (++count == DISP_FREQ) { | |
757 | printf("timer: min=%" PRId64 " us max=%" PRId64 " us avg=%" PRId64 " us avg_freq=%0.3f Hz\n", | |
758 | muldiv64(delta_min, 1000000, get_ticks_per_sec()), | |
759 | muldiv64(delta_max, 1000000, get_ticks_per_sec()), | |
760 | muldiv64(delta_cum, 1000000 / DISP_FREQ, get_ticks_per_sec()), | |
761 | (double)get_ticks_per_sec() / ((double)delta_cum / DISP_FREQ)); | |
762 | count = 0; | |
763 | delta_min = INT64_MAX; | |
764 | delta_max = 0; | |
765 | delta_cum = 0; | |
766 | } | |
767 | } | |
768 | last_clock = ti; | |
769 | } | |
770 | #endif | |
771 | if (alarm_has_dynticks(t) || | |
4c3d45eb | 772 | qemu_next_alarm_deadline () <= 0) { |
db1a4972 PB |
773 | t->expired = alarm_has_dynticks(t); |
774 | t->pending = 1; | |
775 | qemu_notify_event(); | |
776 | } | |
777 | } | |
778 | ||
cb842c90 | 779 | int64_t qemu_next_icount_deadline(void) |
db1a4972 PB |
780 | { |
781 | /* To avoid problems with overflow limit this to 2^32. */ | |
782 | int64_t delta = INT32_MAX; | |
783 | ||
cb842c90 | 784 | assert(use_icount); |
db1a4972 PB |
785 | if (active_timers[QEMU_CLOCK_VIRTUAL]) { |
786 | delta = active_timers[QEMU_CLOCK_VIRTUAL]->expire_time - | |
9c13246a | 787 | qemu_get_clock_ns(vm_clock); |
db1a4972 | 788 | } |
db1a4972 PB |
789 | |
790 | if (delta < 0) | |
791 | delta = 0; | |
792 | ||
793 | return delta; | |
794 | } | |
795 | ||
4c3d45eb | 796 | static int64_t qemu_next_alarm_deadline(void) |
db1a4972 PB |
797 | { |
798 | int64_t delta; | |
799 | int64_t rtdelta; | |
800 | ||
6ad0a1ed PB |
801 | if (!use_icount && active_timers[QEMU_CLOCK_VIRTUAL]) { |
802 | delta = active_timers[QEMU_CLOCK_VIRTUAL]->expire_time - | |
74475455 | 803 | qemu_get_clock_ns(vm_clock); |
6ad0a1ed | 804 | } else { |
db1a4972 | 805 | delta = INT32_MAX; |
6ad0a1ed PB |
806 | } |
807 | if (active_timers[QEMU_CLOCK_HOST]) { | |
808 | int64_t hdelta = active_timers[QEMU_CLOCK_HOST]->expire_time - | |
809 | qemu_get_clock_ns(host_clock); | |
810 | if (hdelta < delta) | |
811 | delta = hdelta; | |
812 | } | |
db1a4972 | 813 | if (active_timers[QEMU_CLOCK_REALTIME]) { |
4a998740 | 814 | rtdelta = (active_timers[QEMU_CLOCK_REALTIME]->expire_time - |
9c13246a | 815 | qemu_get_clock_ns(rt_clock)); |
db1a4972 PB |
816 | if (rtdelta < delta) |
817 | delta = rtdelta; | |
818 | } | |
819 | ||
db1a4972 PB |
820 | return delta; |
821 | } | |
822 | ||
4c3d45eb PB |
823 | #if defined(__linux__) |
824 | ||
825 | #define RTC_FREQ 1024 | |
826 | ||
db1a4972 PB |
827 | static void enable_sigio_timer(int fd) |
828 | { | |
829 | struct sigaction act; | |
830 | ||
831 | /* timer signal */ | |
832 | sigfillset(&act.sa_mask); | |
833 | act.sa_flags = 0; | |
834 | act.sa_handler = host_alarm_handler; | |
835 | ||
836 | sigaction(SIGIO, &act, NULL); | |
837 | fcntl_setfl(fd, O_ASYNC); | |
838 | fcntl(fd, F_SETOWN, getpid()); | |
839 | } | |
840 | ||
841 | static int hpet_start_timer(struct qemu_alarm_timer *t) | |
842 | { | |
843 | struct hpet_info info; | |
844 | int r, fd; | |
845 | ||
846 | fd = qemu_open("/dev/hpet", O_RDONLY); | |
847 | if (fd < 0) | |
848 | return -1; | |
849 | ||
850 | /* Set frequency */ | |
851 | r = ioctl(fd, HPET_IRQFREQ, RTC_FREQ); | |
852 | if (r < 0) { | |
853 | fprintf(stderr, "Could not configure '/dev/hpet' to have a 1024Hz timer. This is not a fatal\n" | |
854 | "error, but for better emulation accuracy type:\n" | |
855 | "'echo 1024 > /proc/sys/dev/hpet/max-user-freq' as root.\n"); | |
856 | goto fail; | |
857 | } | |
858 | ||
859 | /* Check capabilities */ | |
860 | r = ioctl(fd, HPET_INFO, &info); | |
861 | if (r < 0) | |
862 | goto fail; | |
863 | ||
864 | /* Enable periodic mode */ | |
865 | r = ioctl(fd, HPET_EPI, 0); | |
866 | if (info.hi_flags && (r < 0)) | |
867 | goto fail; | |
868 | ||
869 | /* Enable interrupt */ | |
870 | r = ioctl(fd, HPET_IE_ON, 0); | |
871 | if (r < 0) | |
872 | goto fail; | |
873 | ||
874 | enable_sigio_timer(fd); | |
cd0544ee | 875 | t->fd = fd; |
db1a4972 PB |
876 | |
877 | return 0; | |
878 | fail: | |
879 | close(fd); | |
880 | return -1; | |
881 | } | |
882 | ||
883 | static void hpet_stop_timer(struct qemu_alarm_timer *t) | |
884 | { | |
cd0544ee | 885 | int fd = t->fd; |
db1a4972 PB |
886 | |
887 | close(fd); | |
888 | } | |
889 | ||
890 | static int rtc_start_timer(struct qemu_alarm_timer *t) | |
891 | { | |
892 | int rtc_fd; | |
893 | unsigned long current_rtc_freq = 0; | |
894 | ||
895 | TFR(rtc_fd = qemu_open("/dev/rtc", O_RDONLY)); | |
896 | if (rtc_fd < 0) | |
897 | return -1; | |
898 | ioctl(rtc_fd, RTC_IRQP_READ, ¤t_rtc_freq); | |
899 | if (current_rtc_freq != RTC_FREQ && | |
900 | ioctl(rtc_fd, RTC_IRQP_SET, RTC_FREQ) < 0) { | |
901 | fprintf(stderr, "Could not configure '/dev/rtc' to have a 1024 Hz timer. This is not a fatal\n" | |
902 | "error, but for better emulation accuracy either use a 2.6 host Linux kernel or\n" | |
903 | "type 'echo 1024 > /proc/sys/dev/rtc/max-user-freq' as root.\n"); | |
904 | goto fail; | |
905 | } | |
906 | if (ioctl(rtc_fd, RTC_PIE_ON, 0) < 0) { | |
907 | fail: | |
908 | close(rtc_fd); | |
909 | return -1; | |
910 | } | |
911 | ||
912 | enable_sigio_timer(rtc_fd); | |
913 | ||
cd0544ee | 914 | t->fd = rtc_fd; |
db1a4972 PB |
915 | |
916 | return 0; | |
917 | } | |
918 | ||
919 | static void rtc_stop_timer(struct qemu_alarm_timer *t) | |
920 | { | |
cd0544ee | 921 | int rtc_fd = t->fd; |
db1a4972 PB |
922 | |
923 | close(rtc_fd); | |
924 | } | |
925 | ||
926 | static int dynticks_start_timer(struct qemu_alarm_timer *t) | |
927 | { | |
928 | struct sigevent ev; | |
929 | timer_t host_timer; | |
930 | struct sigaction act; | |
931 | ||
932 | sigfillset(&act.sa_mask); | |
933 | act.sa_flags = 0; | |
934 | act.sa_handler = host_alarm_handler; | |
935 | ||
936 | sigaction(SIGALRM, &act, NULL); | |
937 | ||
938 | /* | |
939 | * Initialize ev struct to 0 to avoid valgrind complaining | |
940 | * about uninitialized data in timer_create call | |
941 | */ | |
942 | memset(&ev, 0, sizeof(ev)); | |
943 | ev.sigev_value.sival_int = 0; | |
944 | ev.sigev_notify = SIGEV_SIGNAL; | |
945 | ev.sigev_signo = SIGALRM; | |
946 | ||
947 | if (timer_create(CLOCK_REALTIME, &ev, &host_timer)) { | |
948 | perror("timer_create"); | |
949 | ||
950 | /* disable dynticks */ | |
951 | fprintf(stderr, "Dynamic Ticks disabled\n"); | |
952 | ||
953 | return -1; | |
954 | } | |
955 | ||
cd0544ee | 956 | t->timer = host_timer; |
db1a4972 PB |
957 | |
958 | return 0; | |
959 | } | |
960 | ||
961 | static void dynticks_stop_timer(struct qemu_alarm_timer *t) | |
962 | { | |
cd0544ee | 963 | timer_t host_timer = t->timer; |
db1a4972 PB |
964 | |
965 | timer_delete(host_timer); | |
966 | } | |
967 | ||
968 | static void dynticks_rearm_timer(struct qemu_alarm_timer *t) | |
969 | { | |
cd0544ee | 970 | timer_t host_timer = t->timer; |
db1a4972 | 971 | struct itimerspec timeout; |
9c13246a PB |
972 | int64_t nearest_delta_ns = INT64_MAX; |
973 | int64_t current_ns; | |
db1a4972 PB |
974 | |
975 | assert(alarm_has_dynticks(t)); | |
976 | if (!active_timers[QEMU_CLOCK_REALTIME] && | |
977 | !active_timers[QEMU_CLOCK_VIRTUAL] && | |
978 | !active_timers[QEMU_CLOCK_HOST]) | |
979 | return; | |
980 | ||
4c3d45eb PB |
981 | nearest_delta_ns = qemu_next_alarm_deadline(); |
982 | if (nearest_delta_ns < MIN_TIMER_REARM_NS) | |
983 | nearest_delta_ns = MIN_TIMER_REARM_NS; | |
db1a4972 PB |
984 | |
985 | /* check whether a timer is already running */ | |
986 | if (timer_gettime(host_timer, &timeout)) { | |
987 | perror("gettime"); | |
988 | fprintf(stderr, "Internal timer error: aborting\n"); | |
989 | exit(1); | |
990 | } | |
9c13246a PB |
991 | current_ns = timeout.it_value.tv_sec * 1000000000LL + timeout.it_value.tv_nsec; |
992 | if (current_ns && current_ns <= nearest_delta_ns) | |
db1a4972 PB |
993 | return; |
994 | ||
995 | timeout.it_interval.tv_sec = 0; | |
996 | timeout.it_interval.tv_nsec = 0; /* 0 for one-shot timer */ | |
9c13246a PB |
997 | timeout.it_value.tv_sec = nearest_delta_ns / 1000000000; |
998 | timeout.it_value.tv_nsec = nearest_delta_ns % 1000000000; | |
db1a4972 PB |
999 | if (timer_settime(host_timer, 0 /* RELATIVE */, &timeout, NULL)) { |
1000 | perror("settime"); | |
1001 | fprintf(stderr, "Internal timer error: aborting\n"); | |
1002 | exit(1); | |
1003 | } | |
1004 | } | |
1005 | ||
1006 | #endif /* defined(__linux__) */ | |
1007 | ||
f26e5a54 SW |
1008 | #if !defined(_WIN32) |
1009 | ||
db1a4972 PB |
1010 | static int unix_start_timer(struct qemu_alarm_timer *t) |
1011 | { | |
1012 | struct sigaction act; | |
1013 | struct itimerval itv; | |
1014 | int err; | |
1015 | ||
1016 | /* timer signal */ | |
1017 | sigfillset(&act.sa_mask); | |
1018 | act.sa_flags = 0; | |
1019 | act.sa_handler = host_alarm_handler; | |
1020 | ||
1021 | sigaction(SIGALRM, &act, NULL); | |
1022 | ||
1023 | itv.it_interval.tv_sec = 0; | |
1024 | /* for i386 kernel 2.6 to get 1 ms */ | |
1025 | itv.it_interval.tv_usec = 999; | |
1026 | itv.it_value.tv_sec = 0; | |
1027 | itv.it_value.tv_usec = 10 * 1000; | |
1028 | ||
1029 | err = setitimer(ITIMER_REAL, &itv, NULL); | |
1030 | if (err) | |
1031 | return -1; | |
1032 | ||
1033 | return 0; | |
1034 | } | |
1035 | ||
1036 | static void unix_stop_timer(struct qemu_alarm_timer *t) | |
1037 | { | |
1038 | struct itimerval itv; | |
1039 | ||
1040 | memset(&itv, 0, sizeof(itv)); | |
1041 | setitimer(ITIMER_REAL, &itv, NULL); | |
1042 | } | |
1043 | ||
1044 | #endif /* !defined(_WIN32) */ | |
1045 | ||
1046 | ||
1047 | #ifdef _WIN32 | |
1048 | ||
2f9cba0c SW |
1049 | static MMRESULT mm_timer; |
1050 | static unsigned mm_period; | |
1051 | ||
1052 | static void CALLBACK mm_alarm_handler(UINT uTimerID, UINT uMsg, | |
1053 | DWORD_PTR dwUser, DWORD_PTR dw1, | |
1054 | DWORD_PTR dw2) | |
1055 | { | |
1056 | struct qemu_alarm_timer *t = alarm_timer; | |
1057 | if (!t) { | |
1058 | return; | |
1059 | } | |
1060 | if (alarm_has_dynticks(t) || qemu_next_alarm_deadline() <= 0) { | |
1061 | t->expired = alarm_has_dynticks(t); | |
1062 | t->pending = 1; | |
1063 | qemu_notify_event(); | |
1064 | } | |
1065 | } | |
1066 | ||
1067 | static int mm_start_timer(struct qemu_alarm_timer *t) | |
1068 | { | |
1069 | TIMECAPS tc; | |
1070 | UINT flags; | |
1071 | ||
1072 | memset(&tc, 0, sizeof(tc)); | |
1073 | timeGetDevCaps(&tc, sizeof(tc)); | |
1074 | ||
1075 | mm_period = tc.wPeriodMin; | |
1076 | timeBeginPeriod(mm_period); | |
1077 | ||
1078 | flags = TIME_CALLBACK_FUNCTION; | |
1079 | if (alarm_has_dynticks(t)) { | |
1080 | flags |= TIME_ONESHOT; | |
1081 | } else { | |
1082 | flags |= TIME_PERIODIC; | |
1083 | } | |
1084 | ||
1085 | mm_timer = timeSetEvent(1, /* interval (ms) */ | |
1086 | mm_period, /* resolution */ | |
1087 | mm_alarm_handler, /* function */ | |
1088 | (DWORD_PTR)t, /* parameter */ | |
1089 | flags); | |
1090 | ||
1091 | if (!mm_timer) { | |
1092 | fprintf(stderr, "Failed to initialize win32 alarm timer: %ld\n", | |
1093 | GetLastError()); | |
1094 | timeEndPeriod(mm_period); | |
1095 | return -1; | |
1096 | } | |
1097 | ||
1098 | return 0; | |
1099 | } | |
1100 | ||
1101 | static void mm_stop_timer(struct qemu_alarm_timer *t) | |
1102 | { | |
1103 | timeKillEvent(mm_timer); | |
1104 | timeEndPeriod(mm_period); | |
1105 | } | |
1106 | ||
1107 | static void mm_rearm_timer(struct qemu_alarm_timer *t) | |
1108 | { | |
1109 | int nearest_delta_ms; | |
1110 | ||
1111 | assert(alarm_has_dynticks(t)); | |
1112 | if (!active_timers[QEMU_CLOCK_REALTIME] && | |
1113 | !active_timers[QEMU_CLOCK_VIRTUAL] && | |
1114 | !active_timers[QEMU_CLOCK_HOST]) { | |
1115 | return; | |
1116 | } | |
1117 | ||
1118 | timeKillEvent(mm_timer); | |
1119 | ||
1120 | nearest_delta_ms = (qemu_next_alarm_deadline() + 999999) / 1000000; | |
1121 | if (nearest_delta_ms < 1) { | |
1122 | nearest_delta_ms = 1; | |
1123 | } | |
1124 | mm_timer = timeSetEvent(nearest_delta_ms, | |
1125 | mm_period, | |
1126 | mm_alarm_handler, | |
1127 | (DWORD_PTR)t, | |
1128 | TIME_ONESHOT | TIME_CALLBACK_FUNCTION); | |
1129 | ||
1130 | if (!mm_timer) { | |
1131 | fprintf(stderr, "Failed to re-arm win32 alarm timer %ld\n", | |
1132 | GetLastError()); | |
1133 | ||
1134 | timeEndPeriod(mm_period); | |
1135 | exit(1); | |
1136 | } | |
1137 | } | |
1138 | ||
db1a4972 PB |
1139 | static int win32_start_timer(struct qemu_alarm_timer *t) |
1140 | { | |
68c23e55 PB |
1141 | HANDLE hTimer; |
1142 | BOOLEAN success; | |
1143 | ||
1144 | /* If you call ChangeTimerQueueTimer on a one-shot timer (its period | |
1145 | is zero) that has already expired, the timer is not updated. Since | |
1146 | creating a new timer is relatively expensive, set a bogus one-hour | |
1147 | interval in the dynticks case. */ | |
1148 | success = CreateTimerQueueTimer(&hTimer, | |
1149 | NULL, | |
1150 | host_alarm_handler, | |
1151 | t, | |
1152 | 1, | |
1153 | alarm_has_dynticks(t) ? 3600000 : 1, | |
1154 | WT_EXECUTEINTIMERTHREAD); | |
1155 | ||
1156 | if (!success) { | |
db1a4972 PB |
1157 | fprintf(stderr, "Failed to initialize win32 alarm timer: %ld\n", |
1158 | GetLastError()); | |
db1a4972 PB |
1159 | return -1; |
1160 | } | |
1161 | ||
cd0544ee | 1162 | t->timer = hTimer; |
db1a4972 PB |
1163 | return 0; |
1164 | } | |
1165 | ||
1166 | static void win32_stop_timer(struct qemu_alarm_timer *t) | |
1167 | { | |
cd0544ee | 1168 | HANDLE hTimer = t->timer; |
db1a4972 | 1169 | |
68c23e55 PB |
1170 | if (hTimer) { |
1171 | DeleteTimerQueueTimer(NULL, hTimer, NULL); | |
1172 | } | |
db1a4972 PB |
1173 | } |
1174 | ||
1175 | static void win32_rearm_timer(struct qemu_alarm_timer *t) | |
1176 | { | |
cd0544ee | 1177 | HANDLE hTimer = t->timer; |
cfced5b2 | 1178 | int nearest_delta_ms; |
68c23e55 | 1179 | BOOLEAN success; |
db1a4972 PB |
1180 | |
1181 | assert(alarm_has_dynticks(t)); | |
1182 | if (!active_timers[QEMU_CLOCK_REALTIME] && | |
1183 | !active_timers[QEMU_CLOCK_VIRTUAL] && | |
1184 | !active_timers[QEMU_CLOCK_HOST]) | |
1185 | return; | |
1186 | ||
cfced5b2 PB |
1187 | nearest_delta_ms = (qemu_next_alarm_deadline() + 999999) / 1000000; |
1188 | if (nearest_delta_ms < 1) { | |
1189 | nearest_delta_ms = 1; | |
1190 | } | |
68c23e55 PB |
1191 | success = ChangeTimerQueueTimer(NULL, |
1192 | hTimer, | |
1193 | nearest_delta_ms, | |
1194 | 3600000); | |
db1a4972 | 1195 | |
68c23e55 PB |
1196 | if (!success) { |
1197 | fprintf(stderr, "Failed to rearm win32 alarm timer: %ld\n", | |
1198 | GetLastError()); | |
1199 | exit(-1); | |
db1a4972 | 1200 | } |
68c23e55 | 1201 | |
db1a4972 PB |
1202 | } |
1203 | ||
1204 | #endif /* _WIN32 */ | |
1205 | ||
1206 | static void alarm_timer_on_change_state_rearm(void *opaque, int running, int reason) | |
1207 | { | |
1208 | if (running) | |
1209 | qemu_rearm_alarm_timer((struct qemu_alarm_timer *) opaque); | |
1210 | } | |
1211 | ||
1212 | int init_timer_alarm(void) | |
1213 | { | |
1214 | struct qemu_alarm_timer *t = NULL; | |
1215 | int i, err = -1; | |
1216 | ||
1217 | for (i = 0; alarm_timers[i].name; i++) { | |
1218 | t = &alarm_timers[i]; | |
1219 | ||
1220 | err = t->start(t); | |
1221 | if (!err) | |
1222 | break; | |
1223 | } | |
1224 | ||
1225 | if (err) { | |
1226 | err = -ENOENT; | |
1227 | goto fail; | |
1228 | } | |
1229 | ||
1230 | /* first event is at time 0 */ | |
1231 | t->pending = 1; | |
1232 | alarm_timer = t; | |
1233 | qemu_add_vm_change_state_handler(alarm_timer_on_change_state_rearm, t); | |
1234 | ||
1235 | return 0; | |
1236 | ||
1237 | fail: | |
1238 | return err; | |
1239 | } | |
1240 | ||
1241 | void quit_timers(void) | |
1242 | { | |
1243 | struct qemu_alarm_timer *t = alarm_timer; | |
1244 | alarm_timer = NULL; | |
1245 | t->stop(t); | |
1246 | } | |
1247 | ||
1248 | int qemu_calculate_timeout(void) | |
1249 | { | |
1ece93a9 | 1250 | #ifndef CONFIG_IOTHREAD |
db1a4972 PB |
1251 | int timeout; |
1252 | ||
1ece93a9 PB |
1253 | if (!vm_running) |
1254 | timeout = 5000; | |
1255 | else { | |
1256 | /* XXX: use timeout computed from timers */ | |
1257 | int64_t add; | |
1258 | int64_t delta; | |
1259 | /* Advance virtual time to the next event. */ | |
1260 | delta = qemu_icount_delta(); | |
1261 | if (delta > 0) { | |
1262 | /* If virtual time is ahead of real time then just | |
1263 | wait for IO. */ | |
1264 | timeout = (delta + 999999) / 1000000; | |
1265 | } else { | |
1266 | /* Wait for either IO to occur or the next | |
1267 | timer event. */ | |
cb842c90 | 1268 | add = qemu_next_icount_deadline(); |
1ece93a9 PB |
1269 | /* We advance the timer before checking for IO. |
1270 | Limit the amount we advance so that early IO | |
1271 | activity won't get the guest too far ahead. */ | |
1272 | if (add > 10000000) | |
1273 | add = 10000000; | |
1274 | delta += add; | |
1275 | qemu_icount += qemu_icount_round (add); | |
1276 | timeout = delta / 1000000; | |
1277 | if (timeout < 0) | |
1278 | timeout = 0; | |
1279 | } | |
db1a4972 PB |
1280 | } |
1281 | ||
1282 | return timeout; | |
1ece93a9 PB |
1283 | #else /* CONFIG_IOTHREAD */ |
1284 | return 1000; | |
1285 | #endif | |
db1a4972 PB |
1286 | } |
1287 |