struct qemu_alarm_timer {
char const *name;
+ unsigned int flags;
int (*start)(struct qemu_alarm_timer *t);
void (*stop)(struct qemu_alarm_timer *t);
+ void (*rearm)(struct qemu_alarm_timer *t);
void *priv;
};
+#define ALARM_FLAG_DYNTICKS 0x1
+
+static inline int alarm_has_dynticks(struct qemu_alarm_timer *t)
+{
+ return t->flags & ALARM_FLAG_DYNTICKS;
+}
+
+static void qemu_rearm_alarm_timer(struct qemu_alarm_timer *t)
+{
+ if (!alarm_has_dynticks(t))
+ return;
+
+ t->rearm(t);
+}
+
+/* TODO: MIN_TIMER_REARM_US should be optimized */
+#define MIN_TIMER_REARM_US 250
+
static struct qemu_alarm_timer *alarm_timer;
#ifdef _WIN32
static int win32_start_timer(struct qemu_alarm_timer *t);
static void win32_stop_timer(struct qemu_alarm_timer *t);
+static void win32_rearm_timer(struct qemu_alarm_timer *t);
#else
static int unix_start_timer(struct qemu_alarm_timer *t);
static void unix_stop_timer(struct qemu_alarm_timer *t);
+static int dynticks_start_timer(struct qemu_alarm_timer *t);
+static void dynticks_stop_timer(struct qemu_alarm_timer *t);
+static void dynticks_rearm_timer(struct qemu_alarm_timer *t);
+
#ifdef __linux__
static int hpet_start_timer(struct qemu_alarm_timer *t);
static int rtc_start_timer(struct qemu_alarm_timer *t);
static void rtc_stop_timer(struct qemu_alarm_timer *t);
-#endif
+#endif /* __linux__ */
#endif /* _WIN32 */
static struct qemu_alarm_timer alarm_timers[] = {
+#ifndef _WIN32
+ {"dynticks", ALARM_FLAG_DYNTICKS, dynticks_start_timer,
+ dynticks_stop_timer, dynticks_rearm_timer, NULL},
#ifdef __linux__
/* HPET - if available - is preferred */
- {"hpet", hpet_start_timer, hpet_stop_timer, NULL},
+ {"hpet", 0, hpet_start_timer, hpet_stop_timer, NULL, NULL},
/* ...otherwise try RTC */
- {"rtc", rtc_start_timer, rtc_stop_timer, NULL},
+ {"rtc", 0, rtc_start_timer, rtc_stop_timer, NULL, NULL},
#endif
-#ifndef _WIN32
- {"unix", unix_start_timer, unix_stop_timer, NULL},
+ {"unix", 0, unix_start_timer, unix_stop_timer, NULL, NULL},
#else
- {"win32", win32_start_timer, win32_stop_timer, &alarm_win32_data},
+ {"dynticks", ALARM_FLAG_DYNTICKS, win32_start_timer,
+ win32_stop_timer, win32_rearm_timer, &alarm_win32_data},
+ {"win32", 0, win32_start_timer,
+ win32_stop_timer, NULL, &alarm_win32_data},
#endif
{NULL, }
};
}
pt = &t->next;
}
+
+ qemu_rearm_alarm_timer(alarm_timer);
}
/* modify the current timer so that it will be fired when current_time
/* run the callback (the timer list can be modified) */
ts->cb(ts->opaque);
}
+ qemu_rearm_alarm_timer(alarm_timer);
}
int64_t qemu_get_clock(QEMUClock *clock)
last_clock = ti;
}
#endif
- if (qemu_timer_expired(active_timers[QEMU_TIMER_VIRTUAL],
+ if (alarm_has_dynticks(alarm_timer) ||
+ qemu_timer_expired(active_timers[QEMU_TIMER_VIRTUAL],
qemu_get_clock(vm_clock)) ||
qemu_timer_expired(active_timers[QEMU_TIMER_REALTIME],
qemu_get_clock(rt_clock))) {
}
}
+static uint64_t qemu_next_deadline(void)
+{
+ int64_t nearest_delta_us = ULLONG_MAX;
+ int64_t vmdelta_us;
+
+ if (active_timers[QEMU_TIMER_REALTIME])
+ nearest_delta_us = (active_timers[QEMU_TIMER_REALTIME]->expire_time -
+ qemu_get_clock(rt_clock))*1000;
+
+ if (active_timers[QEMU_TIMER_VIRTUAL]) {
+ /* round up */
+ vmdelta_us = (active_timers[QEMU_TIMER_VIRTUAL]->expire_time -
+ qemu_get_clock(vm_clock)+999)/1000;
+ if (vmdelta_us < nearest_delta_us)
+ nearest_delta_us = vmdelta_us;
+ }
+
+ /* Avoid arming the timer to negative, zero, or too low values */
+ if (nearest_delta_us <= MIN_TIMER_REARM_US)
+ nearest_delta_us = MIN_TIMER_REARM_US;
+
+ return nearest_delta_us;
+}
+
#ifndef _WIN32
#if defined(__linux__)
#endif /* !defined(__linux__) */
+static int dynticks_start_timer(struct qemu_alarm_timer *t)
+{
+ struct sigevent ev;
+ timer_t host_timer;
+ struct sigaction act;
+
+ sigfillset(&act.sa_mask);
+ act.sa_flags = 0;
+#if defined(TARGET_I386) && defined(USE_CODE_COPY)
+ act.sa_flags |= SA_ONSTACK;
+#endif
+ act.sa_handler = host_alarm_handler;
+
+ sigaction(SIGALRM, &act, NULL);
+
+ ev.sigev_value.sival_int = 0;
+ ev.sigev_notify = SIGEV_SIGNAL;
+ ev.sigev_signo = SIGALRM;
+
+ if (timer_create(CLOCK_REALTIME, &ev, &host_timer)) {
+ perror("timer_create");
+
+ /* disable dynticks */
+ fprintf(stderr, "Dynamic Ticks disabled\n");
+
+ return -1;
+ }
+
+ t->priv = (void *)host_timer;
+
+ return 0;
+}
+
+static void dynticks_stop_timer(struct qemu_alarm_timer *t)
+{
+ timer_t host_timer = (timer_t)t->priv;
+
+ timer_delete(host_timer);
+}
+
+static void dynticks_rearm_timer(struct qemu_alarm_timer *t)
+{
+ timer_t host_timer = (timer_t)t->priv;
+ struct itimerspec timeout;
+ int64_t nearest_delta_us = INT64_MAX;
+ int64_t current_us;
+
+ if (!active_timers[QEMU_TIMER_REALTIME] &&
+ !active_timers[QEMU_TIMER_VIRTUAL])
+ return;
+
+ nearest_delta_us = qemu_next_deadline();
+
+ /* check whether a timer is already running */
+ if (timer_gettime(host_timer, &timeout)) {
+ perror("gettime");
+ fprintf(stderr, "Internal timer error: aborting\n");
+ exit(1);
+ }
+ current_us = timeout.it_value.tv_sec * 1000000 + timeout.it_value.tv_nsec/1000;
+ if (current_us && current_us <= nearest_delta_us)
+ return;
+
+ timeout.it_interval.tv_sec = 0;
+ timeout.it_interval.tv_nsec = 0; /* 0 for one-shot timer */
+ timeout.it_value.tv_sec = nearest_delta_us / 1000000;
+ timeout.it_value.tv_nsec = (nearest_delta_us % 1000000) * 1000;
+ if (timer_settime(host_timer, 0 /* RELATIVE */, &timeout, NULL)) {
+ perror("settime");
+ fprintf(stderr, "Internal timer error: aborting\n");
+ exit(1);
+ }
+}
+
static int unix_start_timer(struct qemu_alarm_timer *t)
{
struct sigaction act;
{
TIMECAPS tc;
struct qemu_alarm_win32 *data = t->priv;
+ UINT flags;
data->host_alarm = CreateEvent(NULL, FALSE, FALSE, NULL);
if (!data->host_alarm) {
timeBeginPeriod(data->period);
+ flags = TIME_CALLBACK_FUNCTION;
+ if (alarm_has_dynticks(t))
+ flags |= TIME_ONESHOT;
+ else
+ flags |= TIME_PERIODIC;
+
data->timerId = timeSetEvent(1, // interval (ms)
data->period, // resolution
host_alarm_handler, // function
(DWORD)t, // parameter
- TIME_PERIODIC | TIME_CALLBACK_FUNCTION);
+ flags);
if (!data->timerId) {
perror("Failed to initialize win32 alarm timer");
CloseHandle(data->host_alarm);
}
+static void win32_rearm_timer(struct qemu_alarm_timer *t)
+{
+ struct qemu_alarm_win32 *data = t->priv;
+ uint64_t nearest_delta_us;
+
+ if (!active_timers[QEMU_TIMER_REALTIME] &&
+ !active_timers[QEMU_TIMER_VIRTUAL])
+ return;
+
+ nearest_delta_us = qemu_next_deadline();
+ nearest_delta_us /= 1000;
+
+ timeKillEvent(data->timerId);
+
+ data->timerId = timeSetEvent(1,
+ data->period,
+ host_alarm_handler,
+ (DWORD)t,
+ TIME_ONESHOT | TIME_PERIODIC);
+
+ if (!data->timerId) {
+ perror("Failed to re-arm win32 alarm timer");
+
+ timeEndPeriod(data->period);
+ CloseHandle(data->host_alarm);
+ exit(1);
+ }
+}
+
#endif /* _WIN32 */
static void init_timer_alarm(void)
cpu_enable_ticks();
vm_running = 1;
vm_state_notify(1);
+ qemu_rearm_alarm_timer(alarm_timer);
}
}
projects / mirror_qemu.git / commitdiff