793 lines
19 KiB
C
793 lines
19 KiB
C
/*
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* QEMU System Emulator
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "sysemu/sysemu.h"
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#include "monitor/monitor.h"
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#include "ui/console.h"
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#include "hw/hw.h"
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#include "qemu/timer.h"
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#ifdef CONFIG_POSIX
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#include <pthread.h>
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#endif
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#ifdef _WIN32
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#include <mmsystem.h>
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#endif
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/***********************************************************/
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/* timers */
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#define QEMU_CLOCK_REALTIME 0
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#define QEMU_CLOCK_VIRTUAL 1
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#define QEMU_CLOCK_HOST 2
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struct QEMUClock {
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QEMUTimer *active_timers;
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NotifierList reset_notifiers;
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int64_t last;
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int type;
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bool enabled;
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};
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struct QEMUTimer {
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int64_t expire_time; /* in nanoseconds */
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QEMUClock *clock;
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QEMUTimerCB *cb;
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void *opaque;
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QEMUTimer *next;
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int scale;
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};
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struct qemu_alarm_timer {
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char const *name;
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int (*start)(struct qemu_alarm_timer *t);
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void (*stop)(struct qemu_alarm_timer *t);
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void (*rearm)(struct qemu_alarm_timer *t, int64_t nearest_delta_ns);
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#if defined(__linux__)
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timer_t timer;
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int fd;
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#elif defined(_WIN32)
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HANDLE timer;
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#endif
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bool expired;
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bool pending;
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};
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static struct qemu_alarm_timer *alarm_timer;
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static bool qemu_timer_expired_ns(QEMUTimer *timer_head, int64_t current_time)
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{
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return timer_head && (timer_head->expire_time <= current_time);
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}
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static int64_t qemu_next_alarm_deadline(void)
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{
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int64_t delta = INT64_MAX;
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int64_t rtdelta;
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if (!use_icount && vm_clock->enabled && vm_clock->active_timers) {
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delta = vm_clock->active_timers->expire_time -
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qemu_get_clock_ns(vm_clock);
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}
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if (host_clock->enabled && host_clock->active_timers) {
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int64_t hdelta = host_clock->active_timers->expire_time -
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qemu_get_clock_ns(host_clock);
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if (hdelta < delta) {
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delta = hdelta;
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}
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}
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if (rt_clock->enabled && rt_clock->active_timers) {
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rtdelta = (rt_clock->active_timers->expire_time -
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qemu_get_clock_ns(rt_clock));
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if (rtdelta < delta) {
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delta = rtdelta;
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}
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}
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return delta;
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}
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static void qemu_rearm_alarm_timer(struct qemu_alarm_timer *t)
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{
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int64_t nearest_delta_ns = qemu_next_alarm_deadline();
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if (nearest_delta_ns < INT64_MAX) {
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t->rearm(t, nearest_delta_ns);
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}
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}
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/* TODO: MIN_TIMER_REARM_NS should be optimized */
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#define MIN_TIMER_REARM_NS 250000
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#ifdef _WIN32
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static int mm_start_timer(struct qemu_alarm_timer *t);
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static void mm_stop_timer(struct qemu_alarm_timer *t);
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static void mm_rearm_timer(struct qemu_alarm_timer *t, int64_t delta);
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static int win32_start_timer(struct qemu_alarm_timer *t);
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static void win32_stop_timer(struct qemu_alarm_timer *t);
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static void win32_rearm_timer(struct qemu_alarm_timer *t, int64_t delta);
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#else
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static int unix_start_timer(struct qemu_alarm_timer *t);
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static void unix_stop_timer(struct qemu_alarm_timer *t);
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static void unix_rearm_timer(struct qemu_alarm_timer *t, int64_t delta);
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#ifdef __linux__
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static int dynticks_start_timer(struct qemu_alarm_timer *t);
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static void dynticks_stop_timer(struct qemu_alarm_timer *t);
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static void dynticks_rearm_timer(struct qemu_alarm_timer *t, int64_t delta);
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#endif /* __linux__ */
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#endif /* _WIN32 */
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static struct qemu_alarm_timer alarm_timers[] = {
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#ifndef _WIN32
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#ifdef __linux__
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{"dynticks", dynticks_start_timer,
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dynticks_stop_timer, dynticks_rearm_timer},
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#endif
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{"unix", unix_start_timer, unix_stop_timer, unix_rearm_timer},
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#else
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{"mmtimer", mm_start_timer, mm_stop_timer, mm_rearm_timer},
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{"dynticks", win32_start_timer, win32_stop_timer, win32_rearm_timer},
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#endif
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{NULL, }
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};
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static void show_available_alarms(void)
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{
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int i;
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printf("Available alarm timers, in order of precedence:\n");
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for (i = 0; alarm_timers[i].name; i++)
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printf("%s\n", alarm_timers[i].name);
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}
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void configure_alarms(char const *opt)
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{
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int i;
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int cur = 0;
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int count = ARRAY_SIZE(alarm_timers) - 1;
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char *arg;
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char *name;
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struct qemu_alarm_timer tmp;
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if (is_help_option(opt)) {
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show_available_alarms();
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exit(0);
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}
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arg = g_strdup(opt);
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/* Reorder the array */
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name = strtok(arg, ",");
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while (name) {
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for (i = 0; i < count && alarm_timers[i].name; i++) {
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if (!strcmp(alarm_timers[i].name, name))
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break;
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}
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if (i == count) {
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fprintf(stderr, "Unknown clock %s\n", name);
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goto next;
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}
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if (i < cur)
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/* Ignore */
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goto next;
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/* Swap */
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tmp = alarm_timers[i];
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alarm_timers[i] = alarm_timers[cur];
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alarm_timers[cur] = tmp;
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cur++;
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next:
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name = strtok(NULL, ",");
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}
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g_free(arg);
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if (cur) {
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/* Disable remaining timers */
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for (i = cur; i < count; i++)
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alarm_timers[i].name = NULL;
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} else {
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show_available_alarms();
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exit(1);
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}
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}
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QEMUClock *rt_clock;
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QEMUClock *vm_clock;
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QEMUClock *host_clock;
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static QEMUClock *qemu_new_clock(int type)
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{
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QEMUClock *clock;
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clock = g_malloc0(sizeof(QEMUClock));
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clock->type = type;
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clock->enabled = true;
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clock->last = INT64_MIN;
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notifier_list_init(&clock->reset_notifiers);
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return clock;
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}
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void qemu_clock_enable(QEMUClock *clock, bool enabled)
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{
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bool old = clock->enabled;
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clock->enabled = enabled;
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if (enabled && !old) {
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qemu_rearm_alarm_timer(alarm_timer);
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}
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}
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int64_t qemu_clock_has_timers(QEMUClock *clock)
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{
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return !!clock->active_timers;
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}
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int64_t qemu_clock_expired(QEMUClock *clock)
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{
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return (clock->active_timers &&
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clock->active_timers->expire_time < qemu_get_clock_ns(clock));
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}
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int64_t qemu_clock_deadline(QEMUClock *clock)
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{
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/* To avoid problems with overflow limit this to 2^32. */
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int64_t delta = INT32_MAX;
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if (clock->active_timers) {
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delta = clock->active_timers->expire_time - qemu_get_clock_ns(clock);
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}
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if (delta < 0) {
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delta = 0;
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}
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return delta;
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}
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QEMUTimer *qemu_new_timer(QEMUClock *clock, int scale,
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QEMUTimerCB *cb, void *opaque)
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{
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QEMUTimer *ts;
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ts = g_malloc0(sizeof(QEMUTimer));
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ts->clock = clock;
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ts->cb = cb;
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ts->opaque = opaque;
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ts->scale = scale;
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return ts;
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}
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void qemu_free_timer(QEMUTimer *ts)
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{
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g_free(ts);
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}
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/* stop a timer, but do not dealloc it */
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void qemu_del_timer(QEMUTimer *ts)
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{
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QEMUTimer **pt, *t;
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/* NOTE: this code must be signal safe because
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qemu_timer_expired() can be called from a signal. */
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pt = &ts->clock->active_timers;
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for(;;) {
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t = *pt;
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if (!t)
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break;
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if (t == ts) {
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*pt = t->next;
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break;
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}
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pt = &t->next;
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}
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}
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/* modify the current timer so that it will be fired when current_time
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>= expire_time. The corresponding callback will be called. */
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void qemu_mod_timer_ns(QEMUTimer *ts, int64_t expire_time)
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{
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QEMUTimer **pt, *t;
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qemu_del_timer(ts);
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/* add the timer in the sorted list */
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/* NOTE: this code must be signal safe because
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qemu_timer_expired() can be called from a signal. */
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pt = &ts->clock->active_timers;
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for(;;) {
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t = *pt;
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if (!qemu_timer_expired_ns(t, expire_time)) {
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break;
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}
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pt = &t->next;
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}
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ts->expire_time = expire_time;
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ts->next = *pt;
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*pt = ts;
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/* Rearm if necessary */
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if (pt == &ts->clock->active_timers) {
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if (!alarm_timer->pending) {
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qemu_rearm_alarm_timer(alarm_timer);
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}
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/* Interrupt execution to force deadline recalculation. */
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qemu_clock_warp(ts->clock);
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if (use_icount) {
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qemu_notify_event();
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}
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}
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}
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void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time)
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{
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qemu_mod_timer_ns(ts, expire_time * ts->scale);
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}
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bool qemu_timer_pending(QEMUTimer *ts)
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{
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QEMUTimer *t;
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for (t = ts->clock->active_timers; t != NULL; t = t->next) {
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if (t == ts) {
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return true;
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}
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}
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return false;
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}
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bool qemu_timer_expired(QEMUTimer *timer_head, int64_t current_time)
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{
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return qemu_timer_expired_ns(timer_head, current_time * timer_head->scale);
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}
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void qemu_run_timers(QEMUClock *clock)
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{
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QEMUTimer *ts;
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int64_t current_time;
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if (!clock->enabled)
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return;
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current_time = qemu_get_clock_ns(clock);
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for(;;) {
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ts = clock->active_timers;
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if (!qemu_timer_expired_ns(ts, current_time)) {
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break;
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}
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/* remove timer from the list before calling the callback */
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clock->active_timers = ts->next;
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ts->next = NULL;
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/* run the callback (the timer list can be modified) */
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ts->cb(ts->opaque);
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}
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}
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int64_t qemu_get_clock_ns(QEMUClock *clock)
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{
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int64_t now, last;
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switch(clock->type) {
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case QEMU_CLOCK_REALTIME:
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return get_clock();
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default:
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case QEMU_CLOCK_VIRTUAL:
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if (use_icount) {
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return cpu_get_icount();
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} else {
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return cpu_get_clock();
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}
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case QEMU_CLOCK_HOST:
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now = get_clock_realtime();
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last = clock->last;
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clock->last = now;
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if (now < last) {
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notifier_list_notify(&clock->reset_notifiers, &now);
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}
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return now;
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}
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}
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void qemu_register_clock_reset_notifier(QEMUClock *clock, Notifier *notifier)
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{
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notifier_list_add(&clock->reset_notifiers, notifier);
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}
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void qemu_unregister_clock_reset_notifier(QEMUClock *clock, Notifier *notifier)
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{
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notifier_remove(notifier);
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}
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void init_clocks(void)
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{
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if (!rt_clock) {
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rt_clock = qemu_new_clock(QEMU_CLOCK_REALTIME);
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vm_clock = qemu_new_clock(QEMU_CLOCK_VIRTUAL);
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host_clock = qemu_new_clock(QEMU_CLOCK_HOST);
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}
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}
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uint64_t qemu_timer_expire_time_ns(QEMUTimer *ts)
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{
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return qemu_timer_pending(ts) ? ts->expire_time : -1;
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}
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void qemu_run_all_timers(void)
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{
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alarm_timer->pending = false;
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/* vm time timers */
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qemu_run_timers(vm_clock);
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qemu_run_timers(rt_clock);
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qemu_run_timers(host_clock);
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/* rearm timer, if not periodic */
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if (alarm_timer->expired) {
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alarm_timer->expired = false;
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qemu_rearm_alarm_timer(alarm_timer);
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}
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}
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#ifdef _WIN32
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static void CALLBACK host_alarm_handler(PVOID lpParam, BOOLEAN unused)
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#else
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static void host_alarm_handler(int host_signum)
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#endif
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{
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struct qemu_alarm_timer *t = alarm_timer;
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if (!t)
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return;
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t->expired = true;
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t->pending = true;
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qemu_notify_event();
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}
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#if defined(__linux__)
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#include "qemu/compatfd.h"
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static int dynticks_start_timer(struct qemu_alarm_timer *t)
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{
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struct sigevent ev;
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timer_t host_timer;
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struct sigaction act;
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sigfillset(&act.sa_mask);
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act.sa_flags = 0;
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act.sa_handler = host_alarm_handler;
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sigaction(SIGALRM, &act, NULL);
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/*
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* Initialize ev struct to 0 to avoid valgrind complaining
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* about uninitialized data in timer_create call
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*/
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memset(&ev, 0, sizeof(ev));
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ev.sigev_value.sival_int = 0;
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ev.sigev_notify = SIGEV_SIGNAL;
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#ifdef CONFIG_SIGEV_THREAD_ID
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if (qemu_signalfd_available()) {
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ev.sigev_notify = SIGEV_THREAD_ID;
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ev._sigev_un._tid = qemu_get_thread_id();
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}
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#endif /* CONFIG_SIGEV_THREAD_ID */
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ev.sigev_signo = SIGALRM;
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if (timer_create(CLOCK_REALTIME, &ev, &host_timer)) {
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perror("timer_create");
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return -1;
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}
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t->timer = host_timer;
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return 0;
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}
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static void dynticks_stop_timer(struct qemu_alarm_timer *t)
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{
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timer_t host_timer = t->timer;
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timer_delete(host_timer);
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}
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static void dynticks_rearm_timer(struct qemu_alarm_timer *t,
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int64_t nearest_delta_ns)
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{
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timer_t host_timer = t->timer;
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struct itimerspec timeout;
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int64_t current_ns;
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if (nearest_delta_ns < MIN_TIMER_REARM_NS)
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nearest_delta_ns = MIN_TIMER_REARM_NS;
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/* check whether a timer is already running */
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if (timer_gettime(host_timer, &timeout)) {
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perror("gettime");
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fprintf(stderr, "Internal timer error: aborting\n");
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exit(1);
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}
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current_ns = timeout.it_value.tv_sec * 1000000000LL + timeout.it_value.tv_nsec;
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if (current_ns && current_ns <= nearest_delta_ns)
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return;
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|
timeout.it_interval.tv_sec = 0;
|
|
timeout.it_interval.tv_nsec = 0; /* 0 for one-shot timer */
|
|
timeout.it_value.tv_sec = nearest_delta_ns / 1000000000;
|
|
timeout.it_value.tv_nsec = nearest_delta_ns % 1000000000;
|
|
if (timer_settime(host_timer, 0 /* RELATIVE */, &timeout, NULL)) {
|
|
perror("settime");
|
|
fprintf(stderr, "Internal timer error: aborting\n");
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
#endif /* defined(__linux__) */
|
|
|
|
#if !defined(_WIN32)
|
|
|
|
static int unix_start_timer(struct qemu_alarm_timer *t)
|
|
{
|
|
struct sigaction act;
|
|
|
|
/* timer signal */
|
|
sigfillset(&act.sa_mask);
|
|
act.sa_flags = 0;
|
|
act.sa_handler = host_alarm_handler;
|
|
|
|
sigaction(SIGALRM, &act, NULL);
|
|
return 0;
|
|
}
|
|
|
|
static void unix_rearm_timer(struct qemu_alarm_timer *t,
|
|
int64_t nearest_delta_ns)
|
|
{
|
|
struct itimerval itv;
|
|
int err;
|
|
|
|
if (nearest_delta_ns < MIN_TIMER_REARM_NS)
|
|
nearest_delta_ns = MIN_TIMER_REARM_NS;
|
|
|
|
itv.it_interval.tv_sec = 0;
|
|
itv.it_interval.tv_usec = 0; /* 0 for one-shot timer */
|
|
itv.it_value.tv_sec = nearest_delta_ns / 1000000000;
|
|
itv.it_value.tv_usec = (nearest_delta_ns % 1000000000) / 1000;
|
|
err = setitimer(ITIMER_REAL, &itv, NULL);
|
|
if (err) {
|
|
perror("setitimer");
|
|
fprintf(stderr, "Internal timer error: aborting\n");
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
static void unix_stop_timer(struct qemu_alarm_timer *t)
|
|
{
|
|
struct itimerval itv;
|
|
|
|
memset(&itv, 0, sizeof(itv));
|
|
setitimer(ITIMER_REAL, &itv, NULL);
|
|
}
|
|
|
|
#endif /* !defined(_WIN32) */
|
|
|
|
|
|
#ifdef _WIN32
|
|
|
|
static MMRESULT mm_timer;
|
|
static TIMECAPS mm_tc;
|
|
|
|
static void CALLBACK mm_alarm_handler(UINT uTimerID, UINT uMsg,
|
|
DWORD_PTR dwUser, DWORD_PTR dw1,
|
|
DWORD_PTR dw2)
|
|
{
|
|
struct qemu_alarm_timer *t = alarm_timer;
|
|
if (!t) {
|
|
return;
|
|
}
|
|
t->expired = true;
|
|
t->pending = true;
|
|
qemu_notify_event();
|
|
}
|
|
|
|
static int mm_start_timer(struct qemu_alarm_timer *t)
|
|
{
|
|
timeGetDevCaps(&mm_tc, sizeof(mm_tc));
|
|
|
|
timeBeginPeriod(mm_tc.wPeriodMin);
|
|
|
|
mm_timer = timeSetEvent(mm_tc.wPeriodMin, /* interval (ms) */
|
|
mm_tc.wPeriodMin, /* resolution */
|
|
mm_alarm_handler, /* function */
|
|
(DWORD_PTR)t, /* parameter */
|
|
TIME_ONESHOT | TIME_CALLBACK_FUNCTION);
|
|
|
|
if (!mm_timer) {
|
|
fprintf(stderr, "Failed to initialize win32 alarm timer\n");
|
|
timeEndPeriod(mm_tc.wPeriodMin);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void mm_stop_timer(struct qemu_alarm_timer *t)
|
|
{
|
|
timeKillEvent(mm_timer);
|
|
timeEndPeriod(mm_tc.wPeriodMin);
|
|
}
|
|
|
|
static void mm_rearm_timer(struct qemu_alarm_timer *t, int64_t delta)
|
|
{
|
|
int64_t nearest_delta_ms = delta / 1000000;
|
|
if (nearest_delta_ms < mm_tc.wPeriodMin) {
|
|
nearest_delta_ms = mm_tc.wPeriodMin;
|
|
} else if (nearest_delta_ms > mm_tc.wPeriodMax) {
|
|
nearest_delta_ms = mm_tc.wPeriodMax;
|
|
}
|
|
|
|
timeKillEvent(mm_timer);
|
|
mm_timer = timeSetEvent((UINT)nearest_delta_ms,
|
|
mm_tc.wPeriodMin,
|
|
mm_alarm_handler,
|
|
(DWORD_PTR)t,
|
|
TIME_ONESHOT | TIME_CALLBACK_FUNCTION);
|
|
|
|
if (!mm_timer) {
|
|
fprintf(stderr, "Failed to re-arm win32 alarm timer\n");
|
|
timeEndPeriod(mm_tc.wPeriodMin);
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
static int win32_start_timer(struct qemu_alarm_timer *t)
|
|
{
|
|
HANDLE hTimer;
|
|
BOOLEAN success;
|
|
|
|
/* If you call ChangeTimerQueueTimer on a one-shot timer (its period
|
|
is zero) that has already expired, the timer is not updated. Since
|
|
creating a new timer is relatively expensive, set a bogus one-hour
|
|
interval in the dynticks case. */
|
|
success = CreateTimerQueueTimer(&hTimer,
|
|
NULL,
|
|
host_alarm_handler,
|
|
t,
|
|
1,
|
|
3600000,
|
|
WT_EXECUTEINTIMERTHREAD);
|
|
|
|
if (!success) {
|
|
fprintf(stderr, "Failed to initialize win32 alarm timer: %ld\n",
|
|
GetLastError());
|
|
return -1;
|
|
}
|
|
|
|
t->timer = hTimer;
|
|
return 0;
|
|
}
|
|
|
|
static void win32_stop_timer(struct qemu_alarm_timer *t)
|
|
{
|
|
HANDLE hTimer = t->timer;
|
|
|
|
if (hTimer) {
|
|
DeleteTimerQueueTimer(NULL, hTimer, NULL);
|
|
}
|
|
}
|
|
|
|
static void win32_rearm_timer(struct qemu_alarm_timer *t,
|
|
int64_t nearest_delta_ns)
|
|
{
|
|
HANDLE hTimer = t->timer;
|
|
int64_t nearest_delta_ms;
|
|
BOOLEAN success;
|
|
|
|
nearest_delta_ms = nearest_delta_ns / 1000000;
|
|
if (nearest_delta_ms < 1) {
|
|
nearest_delta_ms = 1;
|
|
}
|
|
/* ULONG_MAX can be 32 bit */
|
|
if (nearest_delta_ms > ULONG_MAX) {
|
|
nearest_delta_ms = ULONG_MAX;
|
|
}
|
|
success = ChangeTimerQueueTimer(NULL,
|
|
hTimer,
|
|
(unsigned long) nearest_delta_ms,
|
|
3600000);
|
|
|
|
if (!success) {
|
|
fprintf(stderr, "Failed to rearm win32 alarm timer: %ld\n",
|
|
GetLastError());
|
|
exit(-1);
|
|
}
|
|
|
|
}
|
|
|
|
#endif /* _WIN32 */
|
|
|
|
static void quit_timers(void)
|
|
{
|
|
struct qemu_alarm_timer *t = alarm_timer;
|
|
alarm_timer = NULL;
|
|
t->stop(t);
|
|
}
|
|
|
|
#ifdef CONFIG_POSIX
|
|
static void reinit_timers(void)
|
|
{
|
|
struct qemu_alarm_timer *t = alarm_timer;
|
|
t->stop(t);
|
|
if (t->start(t)) {
|
|
fprintf(stderr, "Internal timer error: aborting\n");
|
|
exit(1);
|
|
}
|
|
qemu_rearm_alarm_timer(t);
|
|
}
|
|
#endif /* CONFIG_POSIX */
|
|
|
|
int init_timer_alarm(void)
|
|
{
|
|
struct qemu_alarm_timer *t = NULL;
|
|
int i, err = -1;
|
|
|
|
if (alarm_timer) {
|
|
return 0;
|
|
}
|
|
|
|
for (i = 0; alarm_timers[i].name; i++) {
|
|
t = &alarm_timers[i];
|
|
|
|
err = t->start(t);
|
|
if (!err)
|
|
break;
|
|
}
|
|
|
|
if (err) {
|
|
err = -ENOENT;
|
|
goto fail;
|
|
}
|
|
|
|
atexit(quit_timers);
|
|
#ifdef CONFIG_POSIX
|
|
pthread_atfork(NULL, NULL, reinit_timers);
|
|
#endif
|
|
alarm_timer = t;
|
|
return 0;
|
|
|
|
fail:
|
|
return err;
|
|
}
|
|
|