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/*
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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.h" |
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#include "net.h" |
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#include "monitor.h" |
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#include "console.h" |
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#include "hw/hw.h" |
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#include <unistd.h> |
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#include <fcntl.h> |
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#include <time.h> |
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#include <errno.h> |
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#include <sys/time.h> |
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#include <signal.h> |
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#ifdef __FreeBSD__
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#include <sys/param.h> |
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#endif
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#ifdef _WIN32
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#include <windows.h> |
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#include <mmsystem.h> |
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#endif
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#include "qemu-timer.h" |
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/* Conversion factor from emulated instructions to virtual clock ticks. */
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int icount_time_shift;
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/* Arbitrarily pick 1MIPS as the minimum allowable speed. */
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#define MAX_ICOUNT_SHIFT 10 |
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/* Compensate for varying guest execution speed. */
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int64_t qemu_icount_bias; |
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static QEMUTimer *icount_rt_timer;
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static QEMUTimer *icount_vm_timer;
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/***********************************************************/
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/* guest cycle counter */
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typedef struct TimersState { |
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int64_t cpu_ticks_prev; |
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int64_t cpu_ticks_offset; |
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int64_t cpu_clock_offset; |
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int32_t cpu_ticks_enabled; |
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int64_t dummy; |
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} TimersState; |
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TimersState timers_state; |
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/* return the host CPU cycle counter and handle stop/restart */
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int64_t cpu_get_ticks(void)
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{ |
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if (use_icount) {
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return cpu_get_icount();
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} |
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if (!timers_state.cpu_ticks_enabled) {
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return timers_state.cpu_ticks_offset;
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} else {
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int64_t ticks; |
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ticks = cpu_get_real_ticks(); |
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if (timers_state.cpu_ticks_prev > ticks) {
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/* Note: non increasing ticks may happen if the host uses
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software suspend */
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timers_state.cpu_ticks_offset += timers_state.cpu_ticks_prev - ticks; |
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} |
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timers_state.cpu_ticks_prev = ticks; |
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return ticks + timers_state.cpu_ticks_offset;
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} |
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} |
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/* return the host CPU monotonic timer and handle stop/restart */
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static int64_t cpu_get_clock(void) |
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{ |
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int64_t ti; |
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if (!timers_state.cpu_ticks_enabled) {
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return timers_state.cpu_clock_offset;
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} else {
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ti = get_clock(); |
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return ti + timers_state.cpu_clock_offset;
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} |
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} |
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/* enable cpu_get_ticks() */
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void cpu_enable_ticks(void) |
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{ |
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if (!timers_state.cpu_ticks_enabled) {
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timers_state.cpu_ticks_offset -= cpu_get_real_ticks(); |
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timers_state.cpu_clock_offset -= get_clock(); |
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timers_state.cpu_ticks_enabled = 1;
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} |
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} |
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/* disable cpu_get_ticks() : the clock is stopped. You must not call
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cpu_get_ticks() after that. */
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void cpu_disable_ticks(void) |
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{ |
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if (timers_state.cpu_ticks_enabled) {
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timers_state.cpu_ticks_offset = cpu_get_ticks(); |
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timers_state.cpu_clock_offset = cpu_get_clock(); |
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timers_state.cpu_ticks_enabled = 0;
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} |
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} |
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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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int type;
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int enabled;
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QEMUTimer *warp_timer; |
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NotifierList reset_notifiers; |
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int64_t last; |
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}; |
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struct QEMUTimer {
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QEMUClock *clock; |
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int64_t expire_time; /* in nanoseconds */
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int scale;
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QEMUTimerCB *cb; |
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void *opaque;
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struct QEMUTimer *next;
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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); |
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#if defined(__linux__)
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int fd;
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timer_t timer; |
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#elif defined(_WIN32)
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HANDLE timer; |
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#endif
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char expired;
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char 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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int qemu_alarm_pending(void) |
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{ |
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return alarm_timer->pending;
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} |
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static inline int alarm_has_dynticks(struct qemu_alarm_timer *t) |
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{ |
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return !!t->rearm;
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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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if (!alarm_has_dynticks(t))
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return;
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t->rearm(t); |
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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); |
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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); |
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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); |
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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); |
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#endif /* __linux__ */ |
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#endif /* _WIN32 */ |
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/* Correlation between real and virtual time is always going to be
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fairly approximate, so ignore small variation.
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When the guest is idle real and virtual time will be aligned in
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the IO wait loop. */
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#define ICOUNT_WOBBLE (get_ticks_per_sec() / 10) |
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static void icount_adjust(void) |
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{ |
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int64_t cur_time; |
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int64_t cur_icount; |
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int64_t delta; |
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static int64_t last_delta;
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/* If the VM is not running, then do nothing. */
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if (!vm_running)
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return;
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cur_time = cpu_get_clock(); |
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cur_icount = qemu_get_clock_ns(vm_clock); |
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delta = cur_icount - cur_time; |
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/* FIXME: This is a very crude algorithm, somewhat prone to oscillation. */
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if (delta > 0 |
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&& last_delta + ICOUNT_WOBBLE < delta * 2
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&& icount_time_shift > 0) {
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/* The guest is getting too far ahead. Slow time down. */
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icount_time_shift--; |
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} |
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if (delta < 0 |
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&& last_delta - ICOUNT_WOBBLE > delta * 2
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&& icount_time_shift < MAX_ICOUNT_SHIFT) { |
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/* The guest is getting too far behind. Speed time up. */
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icount_time_shift++; |
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} |
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last_delta = delta; |
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qemu_icount_bias = cur_icount - (qemu_icount << icount_time_shift); |
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} |
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static void icount_adjust_rt(void * opaque) |
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{ |
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qemu_mod_timer(icount_rt_timer, |
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qemu_get_clock_ms(rt_clock) + 1000);
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icount_adjust(); |
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} |
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static void icount_adjust_vm(void * opaque) |
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{ |
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qemu_mod_timer(icount_vm_timer, |
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qemu_get_clock_ns(vm_clock) + get_ticks_per_sec() / 10);
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icount_adjust(); |
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} |
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int64_t qemu_icount_round(int64_t count) |
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{ |
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return (count + (1 << icount_time_shift) - 1) >> icount_time_shift; |
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} |
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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, NULL}, |
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{"mmtimer2", 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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{"win32", win32_start_timer, win32_stop_timer, NULL}, |
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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 (!strcmp(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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#define QEMU_NUM_CLOCKS 3 |
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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 QEMUTimer *active_timers[QEMU_NUM_CLOCKS];
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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 = 1;
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notifier_list_init(&clock->reset_notifiers); |
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/* required to detect & report backward jumps */
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if (type == QEMU_CLOCK_HOST) {
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clock->last = get_clock_realtime(); |
374 |
} |
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return clock;
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} |
377 |
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void qemu_clock_enable(QEMUClock *clock, int enabled) |
379 |
{ |
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clock->enabled = enabled; |
381 |
} |
382 |
|
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static int64_t vm_clock_warp_start;
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static void icount_warp_rt(void *opaque) |
386 |
{ |
387 |
if (vm_clock_warp_start == -1) { |
388 |
return;
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} |
390 |
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if (vm_running) {
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int64_t clock = qemu_get_clock_ns(rt_clock); |
393 |
int64_t warp_delta = clock - vm_clock_warp_start; |
394 |
if (use_icount == 1) { |
395 |
qemu_icount_bias += warp_delta; |
396 |
} else {
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397 |
/*
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398 |
* In adaptive mode, do not let the vm_clock run too
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399 |
* far ahead of real time.
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*/
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int64_t cur_time = cpu_get_clock(); |
402 |
int64_t cur_icount = qemu_get_clock_ns(vm_clock); |
403 |
int64_t delta = cur_time - cur_icount; |
404 |
qemu_icount_bias += MIN(warp_delta, delta); |
405 |
} |
406 |
if (qemu_timer_expired(active_timers[QEMU_CLOCK_VIRTUAL],
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qemu_get_clock_ns(vm_clock))) { |
408 |
qemu_notify_event(); |
409 |
} |
410 |
} |
411 |
vm_clock_warp_start = -1;
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412 |
} |
413 |
|
414 |
void qemu_clock_warp(QEMUClock *clock)
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{ |
416 |
int64_t deadline; |
417 |
|
418 |
if (!clock->warp_timer) {
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return;
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420 |
} |
421 |
|
422 |
/*
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* There are too many global variables to make the "warp" behavior
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424 |
* applicable to other clocks. But a clock argument removes the
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* need for if statements all over the place.
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*/
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427 |
assert(clock == vm_clock); |
428 |
|
429 |
/*
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430 |
* If the CPUs have been sleeping, advance the vm_clock timer now. This
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431 |
* ensures that the deadline for the timer is computed correctly below.
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432 |
* This also makes sure that the insn counter is synchronized before the
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433 |
* CPU starts running, in case the CPU is woken by an event other than
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434 |
* the earliest vm_clock timer.
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435 |
*/
|
436 |
icount_warp_rt(NULL);
|
437 |
if (!all_cpu_threads_idle() || !active_timers[clock->type]) {
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438 |
qemu_del_timer(clock->warp_timer); |
439 |
return;
|
440 |
} |
441 |
|
442 |
vm_clock_warp_start = qemu_get_clock_ns(rt_clock); |
443 |
deadline = qemu_next_icount_deadline(); |
444 |
if (deadline > 0) { |
445 |
/*
|
446 |
* Ensure the vm_clock proceeds even when the virtual CPU goes to
|
447 |
* sleep. Otherwise, the CPU might be waiting for a future timer
|
448 |
* interrupt to wake it up, but the interrupt never comes because
|
449 |
* the vCPU isn't running any insns and thus doesn't advance the
|
450 |
* vm_clock.
|
451 |
*
|
452 |
* An extreme solution for this problem would be to never let VCPUs
|
453 |
* sleep in icount mode if there is a pending vm_clock timer; rather
|
454 |
* time could just advance to the next vm_clock event. Instead, we
|
455 |
* do stop VCPUs and only advance vm_clock after some "real" time,
|
456 |
* (related to the time left until the next event) has passed. This
|
457 |
* rt_clock timer will do this. This avoids that the warps are too
|
458 |
* visible externally---for example, you will not be sending network
|
459 |
* packets continously instead of every 100ms.
|
460 |
*/
|
461 |
qemu_mod_timer(clock->warp_timer, vm_clock_warp_start + deadline); |
462 |
} else {
|
463 |
qemu_notify_event(); |
464 |
} |
465 |
} |
466 |
|
467 |
QEMUTimer *qemu_new_timer(QEMUClock *clock, int scale,
|
468 |
QEMUTimerCB *cb, void *opaque)
|
469 |
{ |
470 |
QEMUTimer *ts; |
471 |
|
472 |
ts = g_malloc0(sizeof(QEMUTimer));
|
473 |
ts->clock = clock; |
474 |
ts->cb = cb; |
475 |
ts->opaque = opaque; |
476 |
ts->scale = scale; |
477 |
return ts;
|
478 |
} |
479 |
|
480 |
void qemu_free_timer(QEMUTimer *ts)
|
481 |
{ |
482 |
g_free(ts); |
483 |
} |
484 |
|
485 |
/* stop a timer, but do not dealloc it */
|
486 |
void qemu_del_timer(QEMUTimer *ts)
|
487 |
{ |
488 |
QEMUTimer **pt, *t; |
489 |
|
490 |
/* NOTE: this code must be signal safe because
|
491 |
qemu_timer_expired() can be called from a signal. */
|
492 |
pt = &active_timers[ts->clock->type]; |
493 |
for(;;) {
|
494 |
t = *pt; |
495 |
if (!t)
|
496 |
break;
|
497 |
if (t == ts) {
|
498 |
*pt = t->next; |
499 |
break;
|
500 |
} |
501 |
pt = &t->next; |
502 |
} |
503 |
} |
504 |
|
505 |
/* modify the current timer so that it will be fired when current_time
|
506 |
>= expire_time. The corresponding callback will be called. */
|
507 |
static void qemu_mod_timer_ns(QEMUTimer *ts, int64_t expire_time) |
508 |
{ |
509 |
QEMUTimer **pt, *t; |
510 |
|
511 |
qemu_del_timer(ts); |
512 |
|
513 |
/* add the timer in the sorted list */
|
514 |
/* NOTE: this code must be signal safe because
|
515 |
qemu_timer_expired() can be called from a signal. */
|
516 |
pt = &active_timers[ts->clock->type]; |
517 |
for(;;) {
|
518 |
t = *pt; |
519 |
if (!qemu_timer_expired_ns(t, expire_time)) {
|
520 |
break;
|
521 |
} |
522 |
pt = &t->next; |
523 |
} |
524 |
ts->expire_time = expire_time; |
525 |
ts->next = *pt; |
526 |
*pt = ts; |
527 |
|
528 |
/* Rearm if necessary */
|
529 |
if (pt == &active_timers[ts->clock->type]) {
|
530 |
if (!alarm_timer->pending) {
|
531 |
qemu_rearm_alarm_timer(alarm_timer); |
532 |
} |
533 |
/* Interrupt execution to force deadline recalculation. */
|
534 |
qemu_clock_warp(ts->clock); |
535 |
if (use_icount) {
|
536 |
qemu_notify_event(); |
537 |
} |
538 |
} |
539 |
} |
540 |
|
541 |
/* modify the current timer so that it will be fired when current_time
|
542 |
>= expire_time. The corresponding callback will be called. */
|
543 |
void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time)
|
544 |
{ |
545 |
qemu_mod_timer_ns(ts, expire_time * ts->scale); |
546 |
} |
547 |
|
548 |
int qemu_timer_pending(QEMUTimer *ts)
|
549 |
{ |
550 |
QEMUTimer *t; |
551 |
for(t = active_timers[ts->clock->type]; t != NULL; t = t->next) { |
552 |
if (t == ts)
|
553 |
return 1; |
554 |
} |
555 |
return 0; |
556 |
} |
557 |
|
558 |
int qemu_timer_expired(QEMUTimer *timer_head, int64_t current_time)
|
559 |
{ |
560 |
return qemu_timer_expired_ns(timer_head, current_time * timer_head->scale);
|
561 |
} |
562 |
|
563 |
static void qemu_run_timers(QEMUClock *clock) |
564 |
{ |
565 |
QEMUTimer **ptimer_head, *ts; |
566 |
int64_t current_time; |
567 |
|
568 |
if (!clock->enabled)
|
569 |
return;
|
570 |
|
571 |
current_time = qemu_get_clock_ns(clock); |
572 |
ptimer_head = &active_timers[clock->type]; |
573 |
for(;;) {
|
574 |
ts = *ptimer_head; |
575 |
if (!qemu_timer_expired_ns(ts, current_time)) {
|
576 |
break;
|
577 |
} |
578 |
/* remove timer from the list before calling the callback */
|
579 |
*ptimer_head = ts->next; |
580 |
ts->next = NULL;
|
581 |
|
582 |
/* run the callback (the timer list can be modified) */
|
583 |
ts->cb(ts->opaque); |
584 |
} |
585 |
} |
586 |
|
587 |
int64_t qemu_get_clock_ns(QEMUClock *clock) |
588 |
{ |
589 |
int64_t now, last; |
590 |
|
591 |
switch(clock->type) {
|
592 |
case QEMU_CLOCK_REALTIME:
|
593 |
return get_clock();
|
594 |
default:
|
595 |
case QEMU_CLOCK_VIRTUAL:
|
596 |
if (use_icount) {
|
597 |
return cpu_get_icount();
|
598 |
} else {
|
599 |
return cpu_get_clock();
|
600 |
} |
601 |
case QEMU_CLOCK_HOST:
|
602 |
now = get_clock_realtime(); |
603 |
last = clock->last; |
604 |
clock->last = now; |
605 |
if (now < last) {
|
606 |
notifier_list_notify(&clock->reset_notifiers, &now); |
607 |
} |
608 |
return now;
|
609 |
} |
610 |
} |
611 |
|
612 |
void qemu_register_clock_reset_notifier(QEMUClock *clock, Notifier *notifier)
|
613 |
{ |
614 |
notifier_list_add(&clock->reset_notifiers, notifier); |
615 |
} |
616 |
|
617 |
void qemu_unregister_clock_reset_notifier(QEMUClock *clock, Notifier *notifier)
|
618 |
{ |
619 |
notifier_list_remove(&clock->reset_notifiers, notifier); |
620 |
} |
621 |
|
622 |
void init_clocks(void) |
623 |
{ |
624 |
rt_clock = qemu_new_clock(QEMU_CLOCK_REALTIME); |
625 |
vm_clock = qemu_new_clock(QEMU_CLOCK_VIRTUAL); |
626 |
host_clock = qemu_new_clock(QEMU_CLOCK_HOST); |
627 |
|
628 |
rtc_clock = host_clock; |
629 |
} |
630 |
|
631 |
/* save a timer */
|
632 |
void qemu_put_timer(QEMUFile *f, QEMUTimer *ts)
|
633 |
{ |
634 |
uint64_t expire_time; |
635 |
|
636 |
if (qemu_timer_pending(ts)) {
|
637 |
expire_time = ts->expire_time; |
638 |
} else {
|
639 |
expire_time = -1;
|
640 |
} |
641 |
qemu_put_be64(f, expire_time); |
642 |
} |
643 |
|
644 |
void qemu_get_timer(QEMUFile *f, QEMUTimer *ts)
|
645 |
{ |
646 |
uint64_t expire_time; |
647 |
|
648 |
expire_time = qemu_get_be64(f); |
649 |
if (expire_time != -1) { |
650 |
qemu_mod_timer_ns(ts, expire_time); |
651 |
} else {
|
652 |
qemu_del_timer(ts); |
653 |
} |
654 |
} |
655 |
|
656 |
static const VMStateDescription vmstate_timers = { |
657 |
.name = "timer",
|
658 |
.version_id = 2,
|
659 |
.minimum_version_id = 1,
|
660 |
.minimum_version_id_old = 1,
|
661 |
.fields = (VMStateField []) { |
662 |
VMSTATE_INT64(cpu_ticks_offset, TimersState), |
663 |
VMSTATE_INT64(dummy, TimersState), |
664 |
VMSTATE_INT64_V(cpu_clock_offset, TimersState, 2),
|
665 |
VMSTATE_END_OF_LIST() |
666 |
} |
667 |
}; |
668 |
|
669 |
void configure_icount(const char *option) |
670 |
{ |
671 |
vmstate_register(NULL, 0, &vmstate_timers, &timers_state); |
672 |
if (!option)
|
673 |
return;
|
674 |
|
675 |
vm_clock->warp_timer = qemu_new_timer_ns(rt_clock, icount_warp_rt, NULL);
|
676 |
|
677 |
if (strcmp(option, "auto") != 0) { |
678 |
icount_time_shift = strtol(option, NULL, 0); |
679 |
use_icount = 1;
|
680 |
return;
|
681 |
} |
682 |
|
683 |
use_icount = 2;
|
684 |
|
685 |
/* 125MIPS seems a reasonable initial guess at the guest speed.
|
686 |
It will be corrected fairly quickly anyway. */
|
687 |
icount_time_shift = 3;
|
688 |
|
689 |
/* Have both realtime and virtual time triggers for speed adjustment.
|
690 |
The realtime trigger catches emulated time passing too slowly,
|
691 |
the virtual time trigger catches emulated time passing too fast.
|
692 |
Realtime triggers occur even when idle, so use them less frequently
|
693 |
than VM triggers. */
|
694 |
icount_rt_timer = qemu_new_timer_ms(rt_clock, icount_adjust_rt, NULL);
|
695 |
qemu_mod_timer(icount_rt_timer, |
696 |
qemu_get_clock_ms(rt_clock) + 1000);
|
697 |
icount_vm_timer = qemu_new_timer_ns(vm_clock, icount_adjust_vm, NULL);
|
698 |
qemu_mod_timer(icount_vm_timer, |
699 |
qemu_get_clock_ns(vm_clock) + get_ticks_per_sec() / 10);
|
700 |
} |
701 |
|
702 |
void qemu_run_all_timers(void) |
703 |
{ |
704 |
alarm_timer->pending = 0;
|
705 |
|
706 |
/* rearm timer, if not periodic */
|
707 |
if (alarm_timer->expired) {
|
708 |
alarm_timer->expired = 0;
|
709 |
qemu_rearm_alarm_timer(alarm_timer); |
710 |
} |
711 |
|
712 |
/* vm time timers */
|
713 |
if (vm_running) {
|
714 |
qemu_run_timers(vm_clock); |
715 |
} |
716 |
|
717 |
qemu_run_timers(rt_clock); |
718 |
qemu_run_timers(host_clock); |
719 |
} |
720 |
|
721 |
static int64_t qemu_next_alarm_deadline(void); |
722 |
|
723 |
#ifdef _WIN32
|
724 |
static void CALLBACK host_alarm_handler(PVOID lpParam, BOOLEAN unused) |
725 |
#else
|
726 |
static void host_alarm_handler(int host_signum) |
727 |
#endif
|
728 |
{ |
729 |
struct qemu_alarm_timer *t = alarm_timer;
|
730 |
if (!t)
|
731 |
return;
|
732 |
|
733 |
#if 0
|
734 |
#define DISP_FREQ 1000
|
735 |
{
|
736 |
static int64_t delta_min = INT64_MAX;
|
737 |
static int64_t delta_max, delta_cum, last_clock, delta, ti;
|
738 |
static int count;
|
739 |
ti = qemu_get_clock_ns(vm_clock);
|
740 |
if (last_clock != 0) {
|
741 |
delta = ti - last_clock;
|
742 |
if (delta < delta_min)
|
743 |
delta_min = delta;
|
744 |
if (delta > delta_max)
|
745 |
delta_max = delta;
|
746 |
delta_cum += delta;
|
747 |
if (++count == DISP_FREQ) {
|
748 |
printf("timer: min=%" PRId64 " us max=%" PRId64 " us avg=%" PRId64 " us avg_freq=%0.3f Hz\n",
|
749 |
muldiv64(delta_min, 1000000, get_ticks_per_sec()),
|
750 |
muldiv64(delta_max, 1000000, get_ticks_per_sec()),
|
751 |
muldiv64(delta_cum, 1000000 / DISP_FREQ, get_ticks_per_sec()),
|
752 |
(double)get_ticks_per_sec() / ((double)delta_cum / DISP_FREQ));
|
753 |
count = 0;
|
754 |
delta_min = INT64_MAX;
|
755 |
delta_max = 0;
|
756 |
delta_cum = 0;
|
757 |
}
|
758 |
}
|
759 |
last_clock = ti;
|
760 |
}
|
761 |
#endif
|
762 |
if (alarm_has_dynticks(t) ||
|
763 |
qemu_next_alarm_deadline () <= 0) {
|
764 |
t->expired = alarm_has_dynticks(t); |
765 |
t->pending = 1;
|
766 |
qemu_notify_event(); |
767 |
} |
768 |
} |
769 |
|
770 |
int64_t qemu_next_icount_deadline(void)
|
771 |
{ |
772 |
/* To avoid problems with overflow limit this to 2^32. */
|
773 |
int64_t delta = INT32_MAX; |
774 |
|
775 |
assert(use_icount); |
776 |
if (active_timers[QEMU_CLOCK_VIRTUAL]) {
|
777 |
delta = active_timers[QEMU_CLOCK_VIRTUAL]->expire_time - |
778 |
qemu_get_clock_ns(vm_clock); |
779 |
} |
780 |
|
781 |
if (delta < 0) |
782 |
delta = 0;
|
783 |
|
784 |
return delta;
|
785 |
} |
786 |
|
787 |
static int64_t qemu_next_alarm_deadline(void) |
788 |
{ |
789 |
int64_t delta; |
790 |
int64_t rtdelta; |
791 |
|
792 |
if (!use_icount && active_timers[QEMU_CLOCK_VIRTUAL]) {
|
793 |
delta = active_timers[QEMU_CLOCK_VIRTUAL]->expire_time - |
794 |
qemu_get_clock_ns(vm_clock); |
795 |
} else {
|
796 |
delta = INT32_MAX; |
797 |
} |
798 |
if (active_timers[QEMU_CLOCK_HOST]) {
|
799 |
int64_t hdelta = active_timers[QEMU_CLOCK_HOST]->expire_time - |
800 |
qemu_get_clock_ns(host_clock); |
801 |
if (hdelta < delta)
|
802 |
delta = hdelta; |
803 |
} |
804 |
if (active_timers[QEMU_CLOCK_REALTIME]) {
|
805 |
rtdelta = (active_timers[QEMU_CLOCK_REALTIME]->expire_time - |
806 |
qemu_get_clock_ns(rt_clock)); |
807 |
if (rtdelta < delta)
|
808 |
delta = rtdelta; |
809 |
} |
810 |
|
811 |
return delta;
|
812 |
} |
813 |
|
814 |
#if defined(__linux__)
|
815 |
|
816 |
#include "compatfd.h" |
817 |
|
818 |
static int dynticks_start_timer(struct qemu_alarm_timer *t) |
819 |
{ |
820 |
struct sigevent ev;
|
821 |
timer_t host_timer; |
822 |
struct sigaction act;
|
823 |
|
824 |
sigfillset(&act.sa_mask); |
825 |
act.sa_flags = 0;
|
826 |
act.sa_handler = host_alarm_handler; |
827 |
|
828 |
sigaction(SIGALRM, &act, NULL);
|
829 |
|
830 |
/*
|
831 |
* Initialize ev struct to 0 to avoid valgrind complaining
|
832 |
* about uninitialized data in timer_create call
|
833 |
*/
|
834 |
memset(&ev, 0, sizeof(ev)); |
835 |
ev.sigev_value.sival_int = 0;
|
836 |
ev.sigev_notify = SIGEV_SIGNAL; |
837 |
#ifdef SIGEV_THREAD_ID
|
838 |
if (qemu_signalfd_available()) {
|
839 |
ev.sigev_notify = SIGEV_THREAD_ID; |
840 |
ev._sigev_un._tid = qemu_get_thread_id(); |
841 |
} |
842 |
#endif /* SIGEV_THREAD_ID */ |
843 |
ev.sigev_signo = SIGALRM; |
844 |
|
845 |
if (timer_create(CLOCK_REALTIME, &ev, &host_timer)) {
|
846 |
perror("timer_create");
|
847 |
|
848 |
/* disable dynticks */
|
849 |
fprintf(stderr, "Dynamic Ticks disabled\n");
|
850 |
|
851 |
return -1; |
852 |
} |
853 |
|
854 |
t->timer = host_timer; |
855 |
|
856 |
return 0; |
857 |
} |
858 |
|
859 |
static void dynticks_stop_timer(struct qemu_alarm_timer *t) |
860 |
{ |
861 |
timer_t host_timer = t->timer; |
862 |
|
863 |
timer_delete(host_timer); |
864 |
} |
865 |
|
866 |
static void dynticks_rearm_timer(struct qemu_alarm_timer *t) |
867 |
{ |
868 |
timer_t host_timer = t->timer; |
869 |
struct itimerspec timeout;
|
870 |
int64_t nearest_delta_ns = INT64_MAX; |
871 |
int64_t current_ns; |
872 |
|
873 |
assert(alarm_has_dynticks(t)); |
874 |
if (!active_timers[QEMU_CLOCK_REALTIME] &&
|
875 |
!active_timers[QEMU_CLOCK_VIRTUAL] && |
876 |
!active_timers[QEMU_CLOCK_HOST]) |
877 |
return;
|
878 |
|
879 |
nearest_delta_ns = qemu_next_alarm_deadline(); |
880 |
if (nearest_delta_ns < MIN_TIMER_REARM_NS)
|
881 |
nearest_delta_ns = MIN_TIMER_REARM_NS; |
882 |
|
883 |
/* check whether a timer is already running */
|
884 |
if (timer_gettime(host_timer, &timeout)) {
|
885 |
perror("gettime");
|
886 |
fprintf(stderr, "Internal timer error: aborting\n");
|
887 |
exit(1);
|
888 |
} |
889 |
current_ns = timeout.it_value.tv_sec * 1000000000LL + timeout.it_value.tv_nsec;
|
890 |
if (current_ns && current_ns <= nearest_delta_ns)
|
891 |
return;
|
892 |
|
893 |
timeout.it_interval.tv_sec = 0;
|
894 |
timeout.it_interval.tv_nsec = 0; /* 0 for one-shot timer */ |
895 |
timeout.it_value.tv_sec = nearest_delta_ns / 1000000000;
|
896 |
timeout.it_value.tv_nsec = nearest_delta_ns % 1000000000;
|
897 |
if (timer_settime(host_timer, 0 /* RELATIVE */, &timeout, NULL)) { |
898 |
perror("settime");
|
899 |
fprintf(stderr, "Internal timer error: aborting\n");
|
900 |
exit(1);
|
901 |
} |
902 |
} |
903 |
|
904 |
#endif /* defined(__linux__) */ |
905 |
|
906 |
#if !defined(_WIN32)
|
907 |
|
908 |
static int unix_start_timer(struct qemu_alarm_timer *t) |
909 |
{ |
910 |
struct sigaction act;
|
911 |
|
912 |
/* timer signal */
|
913 |
sigfillset(&act.sa_mask); |
914 |
act.sa_flags = 0;
|
915 |
act.sa_handler = host_alarm_handler; |
916 |
|
917 |
sigaction(SIGALRM, &act, NULL);
|
918 |
return 0; |
919 |
} |
920 |
|
921 |
static void unix_rearm_timer(struct qemu_alarm_timer *t) |
922 |
{ |
923 |
struct itimerval itv;
|
924 |
int64_t nearest_delta_ns = INT64_MAX; |
925 |
int err;
|
926 |
|
927 |
assert(alarm_has_dynticks(t)); |
928 |
if (!active_timers[QEMU_CLOCK_REALTIME] &&
|
929 |
!active_timers[QEMU_CLOCK_VIRTUAL] && |
930 |
!active_timers[QEMU_CLOCK_HOST]) |
931 |
return;
|
932 |
|
933 |
nearest_delta_ns = qemu_next_alarm_deadline(); |
934 |
if (nearest_delta_ns < MIN_TIMER_REARM_NS)
|
935 |
nearest_delta_ns = MIN_TIMER_REARM_NS; |
936 |
|
937 |
itv.it_interval.tv_sec = 0;
|
938 |
itv.it_interval.tv_usec = 0; /* 0 for one-shot timer */ |
939 |
itv.it_value.tv_sec = nearest_delta_ns / 1000000000;
|
940 |
itv.it_value.tv_usec = (nearest_delta_ns % 1000000000) / 1000; |
941 |
err = setitimer(ITIMER_REAL, &itv, NULL);
|
942 |
if (err) {
|
943 |
perror("setitimer");
|
944 |
fprintf(stderr, "Internal timer error: aborting\n");
|
945 |
exit(1);
|
946 |
} |
947 |
} |
948 |
|
949 |
static void unix_stop_timer(struct qemu_alarm_timer *t) |
950 |
{ |
951 |
struct itimerval itv;
|
952 |
|
953 |
memset(&itv, 0, sizeof(itv)); |
954 |
setitimer(ITIMER_REAL, &itv, NULL);
|
955 |
} |
956 |
|
957 |
#endif /* !defined(_WIN32) */ |
958 |
|
959 |
|
960 |
#ifdef _WIN32
|
961 |
|
962 |
static MMRESULT mm_timer;
|
963 |
static unsigned mm_period; |
964 |
|
965 |
static void CALLBACK mm_alarm_handler(UINT uTimerID, UINT uMsg, |
966 |
DWORD_PTR dwUser, DWORD_PTR dw1, |
967 |
DWORD_PTR dw2) |
968 |
{ |
969 |
struct qemu_alarm_timer *t = alarm_timer;
|
970 |
if (!t) {
|
971 |
return;
|
972 |
} |
973 |
if (alarm_has_dynticks(t) || qemu_next_alarm_deadline() <= 0) { |
974 |
t->expired = alarm_has_dynticks(t); |
975 |
t->pending = 1;
|
976 |
qemu_notify_event(); |
977 |
} |
978 |
} |
979 |
|
980 |
static int mm_start_timer(struct qemu_alarm_timer *t) |
981 |
{ |
982 |
TIMECAPS tc; |
983 |
UINT flags; |
984 |
|
985 |
memset(&tc, 0, sizeof(tc)); |
986 |
timeGetDevCaps(&tc, sizeof(tc));
|
987 |
|
988 |
mm_period = tc.wPeriodMin; |
989 |
timeBeginPeriod(mm_period); |
990 |
|
991 |
flags = TIME_CALLBACK_FUNCTION; |
992 |
if (alarm_has_dynticks(t)) {
|
993 |
flags |= TIME_ONESHOT; |
994 |
} else {
|
995 |
flags |= TIME_PERIODIC; |
996 |
} |
997 |
|
998 |
mm_timer = timeSetEvent(1, /* interval (ms) */ |
999 |
mm_period, /* resolution */
|
1000 |
mm_alarm_handler, /* function */
|
1001 |
(DWORD_PTR)t, /* parameter */
|
1002 |
flags); |
1003 |
|
1004 |
if (!mm_timer) {
|
1005 |
fprintf(stderr, "Failed to initialize win32 alarm timer: %ld\n",
|
1006 |
GetLastError()); |
1007 |
timeEndPeriod(mm_period); |
1008 |
return -1; |
1009 |
} |
1010 |
|
1011 |
return 0; |
1012 |
} |
1013 |
|
1014 |
static void mm_stop_timer(struct qemu_alarm_timer *t) |
1015 |
{ |
1016 |
timeKillEvent(mm_timer); |
1017 |
timeEndPeriod(mm_period); |
1018 |
} |
1019 |
|
1020 |
static void mm_rearm_timer(struct qemu_alarm_timer *t) |
1021 |
{ |
1022 |
int nearest_delta_ms;
|
1023 |
|
1024 |
assert(alarm_has_dynticks(t)); |
1025 |
if (!active_timers[QEMU_CLOCK_REALTIME] &&
|
1026 |
!active_timers[QEMU_CLOCK_VIRTUAL] && |
1027 |
!active_timers[QEMU_CLOCK_HOST]) { |
1028 |
return;
|
1029 |
} |
1030 |
|
1031 |
timeKillEvent(mm_timer); |
1032 |
|
1033 |
nearest_delta_ms = (qemu_next_alarm_deadline() + 999999) / 1000000; |
1034 |
if (nearest_delta_ms < 1) { |
1035 |
nearest_delta_ms = 1;
|
1036 |
} |
1037 |
mm_timer = timeSetEvent(nearest_delta_ms, |
1038 |
mm_period, |
1039 |
mm_alarm_handler, |
1040 |
(DWORD_PTR)t, |
1041 |
TIME_ONESHOT | TIME_CALLBACK_FUNCTION); |
1042 |
|
1043 |
if (!mm_timer) {
|
1044 |
fprintf(stderr, "Failed to re-arm win32 alarm timer %ld\n",
|
1045 |
GetLastError()); |
1046 |
|
1047 |
timeEndPeriod(mm_period); |
1048 |
exit(1);
|
1049 |
} |
1050 |
} |
1051 |
|
1052 |
static int win32_start_timer(struct qemu_alarm_timer *t) |
1053 |
{ |
1054 |
HANDLE hTimer; |
1055 |
BOOLEAN success; |
1056 |
|
1057 |
/* If you call ChangeTimerQueueTimer on a one-shot timer (its period
|
1058 |
is zero) that has already expired, the timer is not updated. Since
|
1059 |
creating a new timer is relatively expensive, set a bogus one-hour
|
1060 |
interval in the dynticks case. */
|
1061 |
success = CreateTimerQueueTimer(&hTimer, |
1062 |
NULL,
|
1063 |
host_alarm_handler, |
1064 |
t, |
1065 |
1,
|
1066 |
alarm_has_dynticks(t) ? 3600000 : 1, |
1067 |
WT_EXECUTEINTIMERTHREAD); |
1068 |
|
1069 |
if (!success) {
|
1070 |
fprintf(stderr, "Failed to initialize win32 alarm timer: %ld\n",
|
1071 |
GetLastError()); |
1072 |
return -1; |
1073 |
} |
1074 |
|
1075 |
t->timer = hTimer; |
1076 |
return 0; |
1077 |
} |
1078 |
|
1079 |
static void win32_stop_timer(struct qemu_alarm_timer *t) |
1080 |
{ |
1081 |
HANDLE hTimer = t->timer; |
1082 |
|
1083 |
if (hTimer) {
|
1084 |
DeleteTimerQueueTimer(NULL, hTimer, NULL); |
1085 |
} |
1086 |
} |
1087 |
|
1088 |
static void win32_rearm_timer(struct qemu_alarm_timer *t) |
1089 |
{ |
1090 |
HANDLE hTimer = t->timer; |
1091 |
int nearest_delta_ms;
|
1092 |
BOOLEAN success; |
1093 |
|
1094 |
assert(alarm_has_dynticks(t)); |
1095 |
if (!active_timers[QEMU_CLOCK_REALTIME] &&
|
1096 |
!active_timers[QEMU_CLOCK_VIRTUAL] && |
1097 |
!active_timers[QEMU_CLOCK_HOST]) |
1098 |
return;
|
1099 |
|
1100 |
nearest_delta_ms = (qemu_next_alarm_deadline() + 999999) / 1000000; |
1101 |
if (nearest_delta_ms < 1) { |
1102 |
nearest_delta_ms = 1;
|
1103 |
} |
1104 |
success = ChangeTimerQueueTimer(NULL,
|
1105 |
hTimer, |
1106 |
nearest_delta_ms, |
1107 |
3600000);
|
1108 |
|
1109 |
if (!success) {
|
1110 |
fprintf(stderr, "Failed to rearm win32 alarm timer: %ld\n",
|
1111 |
GetLastError()); |
1112 |
exit(-1);
|
1113 |
} |
1114 |
|
1115 |
} |
1116 |
|
1117 |
#endif /* _WIN32 */ |
1118 |
|
1119 |
static void alarm_timer_on_change_state_rearm(void *opaque, int running, int reason) |
1120 |
{ |
1121 |
if (running)
|
1122 |
qemu_rearm_alarm_timer((struct qemu_alarm_timer *) opaque);
|
1123 |
} |
1124 |
|
1125 |
int init_timer_alarm(void) |
1126 |
{ |
1127 |
struct qemu_alarm_timer *t = NULL; |
1128 |
int i, err = -1; |
1129 |
|
1130 |
for (i = 0; alarm_timers[i].name; i++) { |
1131 |
t = &alarm_timers[i]; |
1132 |
|
1133 |
err = t->start(t); |
1134 |
if (!err)
|
1135 |
break;
|
1136 |
} |
1137 |
|
1138 |
if (err) {
|
1139 |
err = -ENOENT; |
1140 |
goto fail;
|
1141 |
} |
1142 |
|
1143 |
/* first event is at time 0 */
|
1144 |
t->pending = 1;
|
1145 |
alarm_timer = t; |
1146 |
qemu_add_vm_change_state_handler(alarm_timer_on_change_state_rearm, t); |
1147 |
|
1148 |
return 0; |
1149 |
|
1150 |
fail:
|
1151 |
return err;
|
1152 |
} |
1153 |
|
1154 |
void quit_timers(void) |
1155 |
{ |
1156 |
struct qemu_alarm_timer *t = alarm_timer;
|
1157 |
alarm_timer = NULL;
|
1158 |
t->stop(t); |
1159 |
} |
1160 |
|
1161 |
int qemu_calculate_timeout(void) |
1162 |
{ |
1163 |
return 1000; |
1164 |
} |
1165 |
|