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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 __linux__
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#include <sys/ioctl.h> |
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#include <linux/rtc.h> |
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/* For the benefit of older linux systems which don't supply it,
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we use a local copy of hpet.h. */
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/* #include <linux/hpet.h> */
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#include "hpet.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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#ifndef CONFIG_IOTHREAD
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static int64_t qemu_icount_delta(void) |
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{ |
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if (!use_icount) {
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return 5000 * (int64_t) 1000000; |
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} else if (use_icount == 1) { |
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/* When not using an adaptive execution frequency
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we tend to get badly out of sync with real time,
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so just delay for a reasonable amount of time. */
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return 0; |
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} else {
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return cpu_get_icount() - cpu_get_clock();
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} |
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} |
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#endif
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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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/* XXX: add frequency */
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}; |
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struct QEMUTimer {
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QEMUClock *clock; |
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int64_t expire_time; |
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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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void *priv;
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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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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_US should be optimized */
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#define MIN_TIMER_REARM_US 250 |
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#ifdef _WIN32
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struct qemu_alarm_win32 {
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MMRESULT timerId; |
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unsigned int period; |
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} alarm_win32_data = {0, 0}; |
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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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#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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static int hpet_start_timer(struct qemu_alarm_timer *t); |
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static void hpet_stop_timer(struct qemu_alarm_timer *t); |
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static int rtc_start_timer(struct qemu_alarm_timer *t); |
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static void rtc_stop_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(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(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(vm_clock) + get_ticks_per_sec() / 10);
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icount_adjust(); |
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} |
286 |
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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, NULL},
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/* HPET - if available - is preferred */
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{"hpet", hpet_start_timer, hpet_stop_timer, NULL, NULL}, |
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/* ...otherwise try RTC */
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{"rtc", rtc_start_timer, rtc_stop_timer, NULL, NULL}, |
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#endif
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{"unix", unix_start_timer, unix_stop_timer, NULL, NULL}, |
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#else
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{"dynticks", win32_start_timer,
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win32_stop_timer, win32_rearm_timer, &alarm_win32_data}, |
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{"win32", win32_start_timer,
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win32_stop_timer, NULL, &alarm_win32_data},
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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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} |
320 |
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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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} |
334 |
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arg = qemu_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++) { |
341 |
if (!strcmp(alarm_timers[i].name, name))
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break;
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} |
344 |
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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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} |
349 |
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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]; |
356 |
alarm_timers[i] = alarm_timers[cur]; |
357 |
alarm_timers[cur] = tmp; |
358 |
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cur++; |
360 |
next:
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name = strtok(NULL, ","); |
362 |
} |
363 |
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qemu_free(arg); |
365 |
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if (cur) {
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/* Disable remaining timers */
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368 |
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(); |
372 |
exit(1);
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} |
374 |
} |
375 |
|
376 |
#define QEMU_NUM_CLOCKS 3 |
377 |
|
378 |
QEMUClock *rt_clock; |
379 |
QEMUClock *vm_clock; |
380 |
QEMUClock *host_clock; |
381 |
|
382 |
static QEMUTimer *active_timers[QEMU_NUM_CLOCKS];
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383 |
|
384 |
static QEMUClock *qemu_new_clock(int type) |
385 |
{ |
386 |
QEMUClock *clock; |
387 |
clock = qemu_mallocz(sizeof(QEMUClock));
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clock->type = type; |
389 |
clock->enabled = 1;
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return clock;
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} |
392 |
|
393 |
void qemu_clock_enable(QEMUClock *clock, int enabled) |
394 |
{ |
395 |
clock->enabled = enabled; |
396 |
} |
397 |
|
398 |
QEMUTimer *qemu_new_timer(QEMUClock *clock, QEMUTimerCB *cb, void *opaque)
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399 |
{ |
400 |
QEMUTimer *ts; |
401 |
|
402 |
ts = qemu_mallocz(sizeof(QEMUTimer));
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403 |
ts->clock = clock; |
404 |
ts->cb = cb; |
405 |
ts->opaque = opaque; |
406 |
return ts;
|
407 |
} |
408 |
|
409 |
void qemu_free_timer(QEMUTimer *ts)
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410 |
{ |
411 |
qemu_free(ts); |
412 |
} |
413 |
|
414 |
/* stop a timer, but do not dealloc it */
|
415 |
void qemu_del_timer(QEMUTimer *ts)
|
416 |
{ |
417 |
QEMUTimer **pt, *t; |
418 |
|
419 |
/* NOTE: this code must be signal safe because
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420 |
qemu_timer_expired() can be called from a signal. */
|
421 |
pt = &active_timers[ts->clock->type]; |
422 |
for(;;) {
|
423 |
t = *pt; |
424 |
if (!t)
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425 |
break;
|
426 |
if (t == ts) {
|
427 |
*pt = t->next; |
428 |
break;
|
429 |
} |
430 |
pt = &t->next; |
431 |
} |
432 |
} |
433 |
|
434 |
/* modify the current timer so that it will be fired when current_time
|
435 |
>= expire_time. The corresponding callback will be called. */
|
436 |
void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time)
|
437 |
{ |
438 |
QEMUTimer **pt, *t; |
439 |
|
440 |
qemu_del_timer(ts); |
441 |
|
442 |
/* add the timer in the sorted list */
|
443 |
/* NOTE: this code must be signal safe because
|
444 |
qemu_timer_expired() can be called from a signal. */
|
445 |
pt = &active_timers[ts->clock->type]; |
446 |
for(;;) {
|
447 |
t = *pt; |
448 |
if (!t)
|
449 |
break;
|
450 |
if (t->expire_time > expire_time)
|
451 |
break;
|
452 |
pt = &t->next; |
453 |
} |
454 |
ts->expire_time = expire_time; |
455 |
ts->next = *pt; |
456 |
*pt = ts; |
457 |
|
458 |
/* Rearm if necessary */
|
459 |
if (pt == &active_timers[ts->clock->type]) {
|
460 |
if (!alarm_timer->pending) {
|
461 |
qemu_rearm_alarm_timer(alarm_timer); |
462 |
} |
463 |
/* Interrupt execution to force deadline recalculation. */
|
464 |
if (use_icount)
|
465 |
qemu_notify_event(); |
466 |
} |
467 |
} |
468 |
|
469 |
int qemu_timer_pending(QEMUTimer *ts)
|
470 |
{ |
471 |
QEMUTimer *t; |
472 |
for(t = active_timers[ts->clock->type]; t != NULL; t = t->next) { |
473 |
if (t == ts)
|
474 |
return 1; |
475 |
} |
476 |
return 0; |
477 |
} |
478 |
|
479 |
int qemu_timer_expired(QEMUTimer *timer_head, int64_t current_time)
|
480 |
{ |
481 |
if (!timer_head)
|
482 |
return 0; |
483 |
return (timer_head->expire_time <= current_time);
|
484 |
} |
485 |
|
486 |
static void qemu_run_timers(QEMUClock *clock) |
487 |
{ |
488 |
QEMUTimer **ptimer_head, *ts; |
489 |
int64_t current_time; |
490 |
|
491 |
if (!clock->enabled)
|
492 |
return;
|
493 |
|
494 |
current_time = qemu_get_clock (clock); |
495 |
ptimer_head = &active_timers[clock->type]; |
496 |
for(;;) {
|
497 |
ts = *ptimer_head; |
498 |
if (!ts || ts->expire_time > current_time)
|
499 |
break;
|
500 |
/* remove timer from the list before calling the callback */
|
501 |
*ptimer_head = ts->next; |
502 |
ts->next = NULL;
|
503 |
|
504 |
/* run the callback (the timer list can be modified) */
|
505 |
ts->cb(ts->opaque); |
506 |
} |
507 |
} |
508 |
|
509 |
int64_t qemu_get_clock(QEMUClock *clock) |
510 |
{ |
511 |
switch(clock->type) {
|
512 |
case QEMU_CLOCK_REALTIME:
|
513 |
return get_clock() / 1000000; |
514 |
default:
|
515 |
case QEMU_CLOCK_VIRTUAL:
|
516 |
if (use_icount) {
|
517 |
return cpu_get_icount();
|
518 |
} else {
|
519 |
return cpu_get_clock();
|
520 |
} |
521 |
case QEMU_CLOCK_HOST:
|
522 |
return get_clock_realtime();
|
523 |
} |
524 |
} |
525 |
|
526 |
int64_t qemu_get_clock_ns(QEMUClock *clock) |
527 |
{ |
528 |
switch(clock->type) {
|
529 |
case QEMU_CLOCK_REALTIME:
|
530 |
return get_clock();
|
531 |
default:
|
532 |
case QEMU_CLOCK_VIRTUAL:
|
533 |
if (use_icount) {
|
534 |
return cpu_get_icount();
|
535 |
} else {
|
536 |
return cpu_get_clock();
|
537 |
} |
538 |
case QEMU_CLOCK_HOST:
|
539 |
return get_clock_realtime();
|
540 |
} |
541 |
} |
542 |
|
543 |
void init_clocks(void) |
544 |
{ |
545 |
rt_clock = qemu_new_clock(QEMU_CLOCK_REALTIME); |
546 |
vm_clock = qemu_new_clock(QEMU_CLOCK_VIRTUAL); |
547 |
host_clock = qemu_new_clock(QEMU_CLOCK_HOST); |
548 |
|
549 |
rtc_clock = host_clock; |
550 |
} |
551 |
|
552 |
/* save a timer */
|
553 |
void qemu_put_timer(QEMUFile *f, QEMUTimer *ts)
|
554 |
{ |
555 |
uint64_t expire_time; |
556 |
|
557 |
if (qemu_timer_pending(ts)) {
|
558 |
expire_time = ts->expire_time; |
559 |
} else {
|
560 |
expire_time = -1;
|
561 |
} |
562 |
qemu_put_be64(f, expire_time); |
563 |
} |
564 |
|
565 |
void qemu_get_timer(QEMUFile *f, QEMUTimer *ts)
|
566 |
{ |
567 |
uint64_t expire_time; |
568 |
|
569 |
expire_time = qemu_get_be64(f); |
570 |
if (expire_time != -1) { |
571 |
qemu_mod_timer(ts, expire_time); |
572 |
} else {
|
573 |
qemu_del_timer(ts); |
574 |
} |
575 |
} |
576 |
|
577 |
static const VMStateDescription vmstate_timers = { |
578 |
.name = "timer",
|
579 |
.version_id = 2,
|
580 |
.minimum_version_id = 1,
|
581 |
.minimum_version_id_old = 1,
|
582 |
.fields = (VMStateField []) { |
583 |
VMSTATE_INT64(cpu_ticks_offset, TimersState), |
584 |
VMSTATE_INT64(dummy, TimersState), |
585 |
VMSTATE_INT64_V(cpu_clock_offset, TimersState, 2),
|
586 |
VMSTATE_END_OF_LIST() |
587 |
} |
588 |
}; |
589 |
|
590 |
void configure_icount(const char *option) |
591 |
{ |
592 |
vmstate_register(NULL, 0, &vmstate_timers, &timers_state); |
593 |
if (!option)
|
594 |
return;
|
595 |
|
596 |
if (strcmp(option, "auto") != 0) { |
597 |
icount_time_shift = strtol(option, NULL, 0); |
598 |
use_icount = 1;
|
599 |
return;
|
600 |
} |
601 |
|
602 |
use_icount = 2;
|
603 |
|
604 |
/* 125MIPS seems a reasonable initial guess at the guest speed.
|
605 |
It will be corrected fairly quickly anyway. */
|
606 |
icount_time_shift = 3;
|
607 |
|
608 |
/* Have both realtime and virtual time triggers for speed adjustment.
|
609 |
The realtime trigger catches emulated time passing too slowly,
|
610 |
the virtual time trigger catches emulated time passing too fast.
|
611 |
Realtime triggers occur even when idle, so use them less frequently
|
612 |
than VM triggers. */
|
613 |
icount_rt_timer = qemu_new_timer(rt_clock, icount_adjust_rt, NULL);
|
614 |
qemu_mod_timer(icount_rt_timer, |
615 |
qemu_get_clock(rt_clock) + 1000);
|
616 |
icount_vm_timer = qemu_new_timer(vm_clock, icount_adjust_vm, NULL);
|
617 |
qemu_mod_timer(icount_vm_timer, |
618 |
qemu_get_clock(vm_clock) + get_ticks_per_sec() / 10);
|
619 |
} |
620 |
|
621 |
void qemu_run_all_timers(void) |
622 |
{ |
623 |
alarm_timer->pending = 0;
|
624 |
|
625 |
/* rearm timer, if not periodic */
|
626 |
if (alarm_timer->expired) {
|
627 |
alarm_timer->expired = 0;
|
628 |
qemu_rearm_alarm_timer(alarm_timer); |
629 |
} |
630 |
|
631 |
/* vm time timers */
|
632 |
if (vm_running) {
|
633 |
qemu_run_timers(vm_clock); |
634 |
} |
635 |
|
636 |
qemu_run_timers(rt_clock); |
637 |
qemu_run_timers(host_clock); |
638 |
} |
639 |
|
640 |
#ifdef _WIN32
|
641 |
static void CALLBACK host_alarm_handler(UINT uTimerID, UINT uMsg, |
642 |
DWORD_PTR dwUser, DWORD_PTR dw1, |
643 |
DWORD_PTR dw2) |
644 |
#else
|
645 |
static void host_alarm_handler(int host_signum) |
646 |
#endif
|
647 |
{ |
648 |
struct qemu_alarm_timer *t = alarm_timer;
|
649 |
if (!t)
|
650 |
return;
|
651 |
|
652 |
#if 0
|
653 |
#define DISP_FREQ 1000
|
654 |
{
|
655 |
static int64_t delta_min = INT64_MAX;
|
656 |
static int64_t delta_max, delta_cum, last_clock, delta, ti;
|
657 |
static int count;
|
658 |
ti = qemu_get_clock(vm_clock);
|
659 |
if (last_clock != 0) {
|
660 |
delta = ti - last_clock;
|
661 |
if (delta < delta_min)
|
662 |
delta_min = delta;
|
663 |
if (delta > delta_max)
|
664 |
delta_max = delta;
|
665 |
delta_cum += delta;
|
666 |
if (++count == DISP_FREQ) {
|
667 |
printf("timer: min=%" PRId64 " us max=%" PRId64 " us avg=%" PRId64 " us avg_freq=%0.3f Hz\n",
|
668 |
muldiv64(delta_min, 1000000, get_ticks_per_sec()),
|
669 |
muldiv64(delta_max, 1000000, get_ticks_per_sec()),
|
670 |
muldiv64(delta_cum, 1000000 / DISP_FREQ, get_ticks_per_sec()),
|
671 |
(double)get_ticks_per_sec() / ((double)delta_cum / DISP_FREQ));
|
672 |
count = 0;
|
673 |
delta_min = INT64_MAX;
|
674 |
delta_max = 0;
|
675 |
delta_cum = 0;
|
676 |
}
|
677 |
}
|
678 |
last_clock = ti;
|
679 |
}
|
680 |
#endif
|
681 |
if (alarm_has_dynticks(t) ||
|
682 |
(!use_icount && |
683 |
qemu_timer_expired(active_timers[QEMU_CLOCK_VIRTUAL], |
684 |
qemu_get_clock(vm_clock))) || |
685 |
qemu_timer_expired(active_timers[QEMU_CLOCK_REALTIME], |
686 |
qemu_get_clock(rt_clock)) || |
687 |
qemu_timer_expired(active_timers[QEMU_CLOCK_HOST], |
688 |
qemu_get_clock(host_clock))) { |
689 |
|
690 |
t->expired = alarm_has_dynticks(t); |
691 |
t->pending = 1;
|
692 |
qemu_notify_event(); |
693 |
} |
694 |
} |
695 |
|
696 |
int64_t qemu_next_deadline(void)
|
697 |
{ |
698 |
/* To avoid problems with overflow limit this to 2^32. */
|
699 |
int64_t delta = INT32_MAX; |
700 |
|
701 |
if (active_timers[QEMU_CLOCK_VIRTUAL]) {
|
702 |
delta = active_timers[QEMU_CLOCK_VIRTUAL]->expire_time - |
703 |
qemu_get_clock(vm_clock); |
704 |
} |
705 |
if (active_timers[QEMU_CLOCK_HOST]) {
|
706 |
int64_t hdelta = active_timers[QEMU_CLOCK_HOST]->expire_time - |
707 |
qemu_get_clock(host_clock); |
708 |
if (hdelta < delta)
|
709 |
delta = hdelta; |
710 |
} |
711 |
|
712 |
if (delta < 0) |
713 |
delta = 0;
|
714 |
|
715 |
return delta;
|
716 |
} |
717 |
|
718 |
#ifndef _WIN32
|
719 |
|
720 |
#if defined(__linux__)
|
721 |
|
722 |
#define RTC_FREQ 1024 |
723 |
|
724 |
static uint64_t qemu_next_deadline_dyntick(void) |
725 |
{ |
726 |
int64_t delta; |
727 |
int64_t rtdelta; |
728 |
|
729 |
if (use_icount)
|
730 |
delta = INT32_MAX; |
731 |
else
|
732 |
delta = (qemu_next_deadline() + 999) / 1000; |
733 |
|
734 |
if (active_timers[QEMU_CLOCK_REALTIME]) {
|
735 |
rtdelta = (active_timers[QEMU_CLOCK_REALTIME]->expire_time - |
736 |
qemu_get_clock(rt_clock))*1000;
|
737 |
if (rtdelta < delta)
|
738 |
delta = rtdelta; |
739 |
} |
740 |
|
741 |
if (delta < MIN_TIMER_REARM_US)
|
742 |
delta = MIN_TIMER_REARM_US; |
743 |
|
744 |
return delta;
|
745 |
} |
746 |
|
747 |
static void enable_sigio_timer(int fd) |
748 |
{ |
749 |
struct sigaction act;
|
750 |
|
751 |
/* timer signal */
|
752 |
sigfillset(&act.sa_mask); |
753 |
act.sa_flags = 0;
|
754 |
act.sa_handler = host_alarm_handler; |
755 |
|
756 |
sigaction(SIGIO, &act, NULL);
|
757 |
fcntl_setfl(fd, O_ASYNC); |
758 |
fcntl(fd, F_SETOWN, getpid()); |
759 |
} |
760 |
|
761 |
static int hpet_start_timer(struct qemu_alarm_timer *t) |
762 |
{ |
763 |
struct hpet_info info;
|
764 |
int r, fd;
|
765 |
|
766 |
fd = qemu_open("/dev/hpet", O_RDONLY);
|
767 |
if (fd < 0) |
768 |
return -1; |
769 |
|
770 |
/* Set frequency */
|
771 |
r = ioctl(fd, HPET_IRQFREQ, RTC_FREQ); |
772 |
if (r < 0) { |
773 |
fprintf(stderr, "Could not configure '/dev/hpet' to have a 1024Hz timer. This is not a fatal\n"
|
774 |
"error, but for better emulation accuracy type:\n"
|
775 |
"'echo 1024 > /proc/sys/dev/hpet/max-user-freq' as root.\n");
|
776 |
goto fail;
|
777 |
} |
778 |
|
779 |
/* Check capabilities */
|
780 |
r = ioctl(fd, HPET_INFO, &info); |
781 |
if (r < 0) |
782 |
goto fail;
|
783 |
|
784 |
/* Enable periodic mode */
|
785 |
r = ioctl(fd, HPET_EPI, 0);
|
786 |
if (info.hi_flags && (r < 0)) |
787 |
goto fail;
|
788 |
|
789 |
/* Enable interrupt */
|
790 |
r = ioctl(fd, HPET_IE_ON, 0);
|
791 |
if (r < 0) |
792 |
goto fail;
|
793 |
|
794 |
enable_sigio_timer(fd); |
795 |
t->priv = (void *)(long)fd; |
796 |
|
797 |
return 0; |
798 |
fail:
|
799 |
close(fd); |
800 |
return -1; |
801 |
} |
802 |
|
803 |
static void hpet_stop_timer(struct qemu_alarm_timer *t) |
804 |
{ |
805 |
int fd = (long)t->priv; |
806 |
|
807 |
close(fd); |
808 |
} |
809 |
|
810 |
static int rtc_start_timer(struct qemu_alarm_timer *t) |
811 |
{ |
812 |
int rtc_fd;
|
813 |
unsigned long current_rtc_freq = 0; |
814 |
|
815 |
TFR(rtc_fd = qemu_open("/dev/rtc", O_RDONLY));
|
816 |
if (rtc_fd < 0) |
817 |
return -1; |
818 |
ioctl(rtc_fd, RTC_IRQP_READ, ¤t_rtc_freq); |
819 |
if (current_rtc_freq != RTC_FREQ &&
|
820 |
ioctl(rtc_fd, RTC_IRQP_SET, RTC_FREQ) < 0) {
|
821 |
fprintf(stderr, "Could not configure '/dev/rtc' to have a 1024 Hz timer. This is not a fatal\n"
|
822 |
"error, but for better emulation accuracy either use a 2.6 host Linux kernel or\n"
|
823 |
"type 'echo 1024 > /proc/sys/dev/rtc/max-user-freq' as root.\n");
|
824 |
goto fail;
|
825 |
} |
826 |
if (ioctl(rtc_fd, RTC_PIE_ON, 0) < 0) { |
827 |
fail:
|
828 |
close(rtc_fd); |
829 |
return -1; |
830 |
} |
831 |
|
832 |
enable_sigio_timer(rtc_fd); |
833 |
|
834 |
t->priv = (void *)(long)rtc_fd; |
835 |
|
836 |
return 0; |
837 |
} |
838 |
|
839 |
static void rtc_stop_timer(struct qemu_alarm_timer *t) |
840 |
{ |
841 |
int rtc_fd = (long)t->priv; |
842 |
|
843 |
close(rtc_fd); |
844 |
} |
845 |
|
846 |
static int dynticks_start_timer(struct qemu_alarm_timer *t) |
847 |
{ |
848 |
struct sigevent ev;
|
849 |
timer_t host_timer; |
850 |
struct sigaction act;
|
851 |
|
852 |
sigfillset(&act.sa_mask); |
853 |
act.sa_flags = 0;
|
854 |
act.sa_handler = host_alarm_handler; |
855 |
|
856 |
sigaction(SIGALRM, &act, NULL);
|
857 |
|
858 |
/*
|
859 |
* Initialize ev struct to 0 to avoid valgrind complaining
|
860 |
* about uninitialized data in timer_create call
|
861 |
*/
|
862 |
memset(&ev, 0, sizeof(ev)); |
863 |
ev.sigev_value.sival_int = 0;
|
864 |
ev.sigev_notify = SIGEV_SIGNAL; |
865 |
ev.sigev_signo = SIGALRM; |
866 |
|
867 |
if (timer_create(CLOCK_REALTIME, &ev, &host_timer)) {
|
868 |
perror("timer_create");
|
869 |
|
870 |
/* disable dynticks */
|
871 |
fprintf(stderr, "Dynamic Ticks disabled\n");
|
872 |
|
873 |
return -1; |
874 |
} |
875 |
|
876 |
t->priv = (void *)(long)host_timer; |
877 |
|
878 |
return 0; |
879 |
} |
880 |
|
881 |
static void dynticks_stop_timer(struct qemu_alarm_timer *t) |
882 |
{ |
883 |
timer_t host_timer = (timer_t)(long)t->priv;
|
884 |
|
885 |
timer_delete(host_timer); |
886 |
} |
887 |
|
888 |
static void dynticks_rearm_timer(struct qemu_alarm_timer *t) |
889 |
{ |
890 |
timer_t host_timer = (timer_t)(long)t->priv;
|
891 |
struct itimerspec timeout;
|
892 |
int64_t nearest_delta_us = INT64_MAX; |
893 |
int64_t current_us; |
894 |
|
895 |
assert(alarm_has_dynticks(t)); |
896 |
if (!active_timers[QEMU_CLOCK_REALTIME] &&
|
897 |
!active_timers[QEMU_CLOCK_VIRTUAL] && |
898 |
!active_timers[QEMU_CLOCK_HOST]) |
899 |
return;
|
900 |
|
901 |
nearest_delta_us = qemu_next_deadline_dyntick(); |
902 |
|
903 |
/* check whether a timer is already running */
|
904 |
if (timer_gettime(host_timer, &timeout)) {
|
905 |
perror("gettime");
|
906 |
fprintf(stderr, "Internal timer error: aborting\n");
|
907 |
exit(1);
|
908 |
} |
909 |
current_us = timeout.it_value.tv_sec * 1000000 + timeout.it_value.tv_nsec/1000; |
910 |
if (current_us && current_us <= nearest_delta_us)
|
911 |
return;
|
912 |
|
913 |
timeout.it_interval.tv_sec = 0;
|
914 |
timeout.it_interval.tv_nsec = 0; /* 0 for one-shot timer */ |
915 |
timeout.it_value.tv_sec = nearest_delta_us / 1000000;
|
916 |
timeout.it_value.tv_nsec = (nearest_delta_us % 1000000) * 1000; |
917 |
if (timer_settime(host_timer, 0 /* RELATIVE */, &timeout, NULL)) { |
918 |
perror("settime");
|
919 |
fprintf(stderr, "Internal timer error: aborting\n");
|
920 |
exit(1);
|
921 |
} |
922 |
} |
923 |
|
924 |
#endif /* defined(__linux__) */ |
925 |
|
926 |
static int unix_start_timer(struct qemu_alarm_timer *t) |
927 |
{ |
928 |
struct sigaction act;
|
929 |
struct itimerval itv;
|
930 |
int err;
|
931 |
|
932 |
/* timer signal */
|
933 |
sigfillset(&act.sa_mask); |
934 |
act.sa_flags = 0;
|
935 |
act.sa_handler = host_alarm_handler; |
936 |
|
937 |
sigaction(SIGALRM, &act, NULL);
|
938 |
|
939 |
itv.it_interval.tv_sec = 0;
|
940 |
/* for i386 kernel 2.6 to get 1 ms */
|
941 |
itv.it_interval.tv_usec = 999;
|
942 |
itv.it_value.tv_sec = 0;
|
943 |
itv.it_value.tv_usec = 10 * 1000; |
944 |
|
945 |
err = setitimer(ITIMER_REAL, &itv, NULL);
|
946 |
if (err)
|
947 |
return -1; |
948 |
|
949 |
return 0; |
950 |
} |
951 |
|
952 |
static void unix_stop_timer(struct qemu_alarm_timer *t) |
953 |
{ |
954 |
struct itimerval itv;
|
955 |
|
956 |
memset(&itv, 0, sizeof(itv)); |
957 |
setitimer(ITIMER_REAL, &itv, NULL);
|
958 |
} |
959 |
|
960 |
#endif /* !defined(_WIN32) */ |
961 |
|
962 |
|
963 |
#ifdef _WIN32
|
964 |
|
965 |
static int win32_start_timer(struct qemu_alarm_timer *t) |
966 |
{ |
967 |
TIMECAPS tc; |
968 |
struct qemu_alarm_win32 *data = t->priv;
|
969 |
UINT flags; |
970 |
|
971 |
memset(&tc, 0, sizeof(tc)); |
972 |
timeGetDevCaps(&tc, sizeof(tc));
|
973 |
|
974 |
data->period = tc.wPeriodMin; |
975 |
timeBeginPeriod(data->period); |
976 |
|
977 |
flags = TIME_CALLBACK_FUNCTION; |
978 |
if (alarm_has_dynticks(t))
|
979 |
flags |= TIME_ONESHOT; |
980 |
else
|
981 |
flags |= TIME_PERIODIC; |
982 |
|
983 |
data->timerId = timeSetEvent(1, // interval (ms) |
984 |
data->period, // resolution
|
985 |
host_alarm_handler, // function
|
986 |
(DWORD)t, // parameter
|
987 |
flags); |
988 |
|
989 |
if (!data->timerId) {
|
990 |
fprintf(stderr, "Failed to initialize win32 alarm timer: %ld\n",
|
991 |
GetLastError()); |
992 |
timeEndPeriod(data->period); |
993 |
return -1; |
994 |
} |
995 |
|
996 |
return 0; |
997 |
} |
998 |
|
999 |
static void win32_stop_timer(struct qemu_alarm_timer *t) |
1000 |
{ |
1001 |
struct qemu_alarm_win32 *data = t->priv;
|
1002 |
|
1003 |
timeKillEvent(data->timerId); |
1004 |
timeEndPeriod(data->period); |
1005 |
} |
1006 |
|
1007 |
static void win32_rearm_timer(struct qemu_alarm_timer *t) |
1008 |
{ |
1009 |
struct qemu_alarm_win32 *data = t->priv;
|
1010 |
|
1011 |
assert(alarm_has_dynticks(t)); |
1012 |
if (!active_timers[QEMU_CLOCK_REALTIME] &&
|
1013 |
!active_timers[QEMU_CLOCK_VIRTUAL] && |
1014 |
!active_timers[QEMU_CLOCK_HOST]) |
1015 |
return;
|
1016 |
|
1017 |
timeKillEvent(data->timerId); |
1018 |
|
1019 |
data->timerId = timeSetEvent(1,
|
1020 |
data->period, |
1021 |
host_alarm_handler, |
1022 |
(DWORD)t, |
1023 |
TIME_ONESHOT | TIME_CALLBACK_FUNCTION); |
1024 |
|
1025 |
if (!data->timerId) {
|
1026 |
fprintf(stderr, "Failed to re-arm win32 alarm timer %ld\n",
|
1027 |
GetLastError()); |
1028 |
|
1029 |
timeEndPeriod(data->period); |
1030 |
exit(1);
|
1031 |
} |
1032 |
} |
1033 |
|
1034 |
#endif /* _WIN32 */ |
1035 |
|
1036 |
static void alarm_timer_on_change_state_rearm(void *opaque, int running, int reason) |
1037 |
{ |
1038 |
if (running)
|
1039 |
qemu_rearm_alarm_timer((struct qemu_alarm_timer *) opaque);
|
1040 |
} |
1041 |
|
1042 |
int init_timer_alarm(void) |
1043 |
{ |
1044 |
struct qemu_alarm_timer *t = NULL; |
1045 |
int i, err = -1; |
1046 |
|
1047 |
for (i = 0; alarm_timers[i].name; i++) { |
1048 |
t = &alarm_timers[i]; |
1049 |
|
1050 |
err = t->start(t); |
1051 |
if (!err)
|
1052 |
break;
|
1053 |
} |
1054 |
|
1055 |
if (err) {
|
1056 |
err = -ENOENT; |
1057 |
goto fail;
|
1058 |
} |
1059 |
|
1060 |
/* first event is at time 0 */
|
1061 |
t->pending = 1;
|
1062 |
alarm_timer = t; |
1063 |
qemu_add_vm_change_state_handler(alarm_timer_on_change_state_rearm, t); |
1064 |
|
1065 |
return 0; |
1066 |
|
1067 |
fail:
|
1068 |
return err;
|
1069 |
} |
1070 |
|
1071 |
void quit_timers(void) |
1072 |
{ |
1073 |
struct qemu_alarm_timer *t = alarm_timer;
|
1074 |
alarm_timer = NULL;
|
1075 |
t->stop(t); |
1076 |
} |
1077 |
|
1078 |
int qemu_calculate_timeout(void) |
1079 |
{ |
1080 |
#ifndef CONFIG_IOTHREAD
|
1081 |
int timeout;
|
1082 |
|
1083 |
if (!vm_running)
|
1084 |
timeout = 5000;
|
1085 |
else {
|
1086 |
/* XXX: use timeout computed from timers */
|
1087 |
int64_t add; |
1088 |
int64_t delta; |
1089 |
/* Advance virtual time to the next event. */
|
1090 |
delta = qemu_icount_delta(); |
1091 |
if (delta > 0) { |
1092 |
/* If virtual time is ahead of real time then just
|
1093 |
wait for IO. */
|
1094 |
timeout = (delta + 999999) / 1000000; |
1095 |
} else {
|
1096 |
/* Wait for either IO to occur or the next
|
1097 |
timer event. */
|
1098 |
add = qemu_next_deadline(); |
1099 |
/* We advance the timer before checking for IO.
|
1100 |
Limit the amount we advance so that early IO
|
1101 |
activity won't get the guest too far ahead. */
|
1102 |
if (add > 10000000) |
1103 |
add = 10000000;
|
1104 |
delta += add; |
1105 |
qemu_icount += qemu_icount_round (add); |
1106 |
timeout = delta / 1000000;
|
1107 |
if (timeout < 0) |
1108 |
timeout = 0;
|
1109 |
} |
1110 |
} |
1111 |
|
1112 |
return timeout;
|
1113 |
#else /* CONFIG_IOTHREAD */ |
1114 |
return 1000; |
1115 |
#endif
|
1116 |
} |
1117 |
|