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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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static int64_t qemu_icount_delta(void) |
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{ |
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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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/* 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_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 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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} |
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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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} |
282 |
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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, NULL},
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{"win32", win32_start_timer,
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win32_stop_timer, NULL, 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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} |
325 |
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arg = qemu_strdup(opt); |
327 |
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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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} |
340 |
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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; |
349 |
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cur++; |
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next:
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name = strtok(NULL, ","); |
353 |
} |
354 |
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qemu_free(arg); |
356 |
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357 |
if (cur) {
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/* Disable remaining timers */
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for (i = cur; i < count; i++)
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360 |
alarm_timers[i].name = NULL;
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} else {
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show_available_alarms(); |
363 |
exit(1);
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} |
365 |
} |
366 |
|
367 |
#define QEMU_NUM_CLOCKS 3 |
368 |
|
369 |
QEMUClock *rt_clock; |
370 |
QEMUClock *vm_clock; |
371 |
QEMUClock *host_clock; |
372 |
|
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static QEMUTimer *active_timers[QEMU_NUM_CLOCKS];
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374 |
|
375 |
static QEMUClock *qemu_new_clock(int type) |
376 |
{ |
377 |
QEMUClock *clock; |
378 |
clock = qemu_mallocz(sizeof(QEMUClock));
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379 |
clock->type = type; |
380 |
clock->enabled = 1;
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381 |
return clock;
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382 |
} |
383 |
|
384 |
void qemu_clock_enable(QEMUClock *clock, int enabled) |
385 |
{ |
386 |
clock->enabled = enabled; |
387 |
} |
388 |
|
389 |
QEMUTimer *qemu_new_timer(QEMUClock *clock, QEMUTimerCB *cb, void *opaque)
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{ |
391 |
QEMUTimer *ts; |
392 |
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ts = qemu_mallocz(sizeof(QEMUTimer));
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394 |
ts->clock = clock; |
395 |
ts->cb = cb; |
396 |
ts->opaque = opaque; |
397 |
return ts;
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398 |
} |
399 |
|
400 |
void qemu_free_timer(QEMUTimer *ts)
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401 |
{ |
402 |
qemu_free(ts); |
403 |
} |
404 |
|
405 |
/* stop a timer, but do not dealloc it */
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406 |
void qemu_del_timer(QEMUTimer *ts)
|
407 |
{ |
408 |
QEMUTimer **pt, *t; |
409 |
|
410 |
/* NOTE: this code must be signal safe because
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411 |
qemu_timer_expired() can be called from a signal. */
|
412 |
pt = &active_timers[ts->clock->type]; |
413 |
for(;;) {
|
414 |
t = *pt; |
415 |
if (!t)
|
416 |
break;
|
417 |
if (t == ts) {
|
418 |
*pt = t->next; |
419 |
break;
|
420 |
} |
421 |
pt = &t->next; |
422 |
} |
423 |
} |
424 |
|
425 |
/* modify the current timer so that it will be fired when current_time
|
426 |
>= expire_time. The corresponding callback will be called. */
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427 |
void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time)
|
428 |
{ |
429 |
QEMUTimer **pt, *t; |
430 |
|
431 |
qemu_del_timer(ts); |
432 |
|
433 |
/* add the timer in the sorted list */
|
434 |
/* NOTE: this code must be signal safe because
|
435 |
qemu_timer_expired() can be called from a signal. */
|
436 |
pt = &active_timers[ts->clock->type]; |
437 |
for(;;) {
|
438 |
t = *pt; |
439 |
if (!t)
|
440 |
break;
|
441 |
if (t->expire_time > expire_time)
|
442 |
break;
|
443 |
pt = &t->next; |
444 |
} |
445 |
ts->expire_time = expire_time; |
446 |
ts->next = *pt; |
447 |
*pt = ts; |
448 |
|
449 |
/* Rearm if necessary */
|
450 |
if (pt == &active_timers[ts->clock->type]) {
|
451 |
if (!alarm_timer->pending) {
|
452 |
qemu_rearm_alarm_timer(alarm_timer); |
453 |
} |
454 |
/* Interrupt execution to force deadline recalculation. */
|
455 |
if (use_icount)
|
456 |
qemu_notify_event(); |
457 |
} |
458 |
} |
459 |
|
460 |
int qemu_timer_pending(QEMUTimer *ts)
|
461 |
{ |
462 |
QEMUTimer *t; |
463 |
for(t = active_timers[ts->clock->type]; t != NULL; t = t->next) { |
464 |
if (t == ts)
|
465 |
return 1; |
466 |
} |
467 |
return 0; |
468 |
} |
469 |
|
470 |
int qemu_timer_expired(QEMUTimer *timer_head, int64_t current_time)
|
471 |
{ |
472 |
if (!timer_head)
|
473 |
return 0; |
474 |
return (timer_head->expire_time <= current_time);
|
475 |
} |
476 |
|
477 |
static void qemu_run_timers(QEMUClock *clock) |
478 |
{ |
479 |
QEMUTimer **ptimer_head, *ts; |
480 |
int64_t current_time; |
481 |
|
482 |
if (!clock->enabled)
|
483 |
return;
|
484 |
|
485 |
current_time = qemu_get_clock (clock); |
486 |
ptimer_head = &active_timers[clock->type]; |
487 |
for(;;) {
|
488 |
ts = *ptimer_head; |
489 |
if (!ts || ts->expire_time > current_time)
|
490 |
break;
|
491 |
/* remove timer from the list before calling the callback */
|
492 |
*ptimer_head = ts->next; |
493 |
ts->next = NULL;
|
494 |
|
495 |
/* run the callback (the timer list can be modified) */
|
496 |
ts->cb(ts->opaque); |
497 |
} |
498 |
} |
499 |
|
500 |
int64_t qemu_get_clock(QEMUClock *clock) |
501 |
{ |
502 |
switch(clock->type) {
|
503 |
case QEMU_CLOCK_REALTIME:
|
504 |
return get_clock() / 1000000; |
505 |
default:
|
506 |
case QEMU_CLOCK_VIRTUAL:
|
507 |
if (use_icount) {
|
508 |
return cpu_get_icount();
|
509 |
} else {
|
510 |
return cpu_get_clock();
|
511 |
} |
512 |
case QEMU_CLOCK_HOST:
|
513 |
return get_clock_realtime();
|
514 |
} |
515 |
} |
516 |
|
517 |
int64_t qemu_get_clock_ns(QEMUClock *clock) |
518 |
{ |
519 |
switch(clock->type) {
|
520 |
case QEMU_CLOCK_REALTIME:
|
521 |
return get_clock();
|
522 |
default:
|
523 |
case QEMU_CLOCK_VIRTUAL:
|
524 |
if (use_icount) {
|
525 |
return cpu_get_icount();
|
526 |
} else {
|
527 |
return cpu_get_clock();
|
528 |
} |
529 |
case QEMU_CLOCK_HOST:
|
530 |
return get_clock_realtime();
|
531 |
} |
532 |
} |
533 |
|
534 |
void init_clocks(void) |
535 |
{ |
536 |
rt_clock = qemu_new_clock(QEMU_CLOCK_REALTIME); |
537 |
vm_clock = qemu_new_clock(QEMU_CLOCK_VIRTUAL); |
538 |
host_clock = qemu_new_clock(QEMU_CLOCK_HOST); |
539 |
|
540 |
rtc_clock = host_clock; |
541 |
} |
542 |
|
543 |
/* save a timer */
|
544 |
void qemu_put_timer(QEMUFile *f, QEMUTimer *ts)
|
545 |
{ |
546 |
uint64_t expire_time; |
547 |
|
548 |
if (qemu_timer_pending(ts)) {
|
549 |
expire_time = ts->expire_time; |
550 |
} else {
|
551 |
expire_time = -1;
|
552 |
} |
553 |
qemu_put_be64(f, expire_time); |
554 |
} |
555 |
|
556 |
void qemu_get_timer(QEMUFile *f, QEMUTimer *ts)
|
557 |
{ |
558 |
uint64_t expire_time; |
559 |
|
560 |
expire_time = qemu_get_be64(f); |
561 |
if (expire_time != -1) { |
562 |
qemu_mod_timer(ts, expire_time); |
563 |
} else {
|
564 |
qemu_del_timer(ts); |
565 |
} |
566 |
} |
567 |
|
568 |
static const VMStateDescription vmstate_timers = { |
569 |
.name = "timer",
|
570 |
.version_id = 2,
|
571 |
.minimum_version_id = 1,
|
572 |
.minimum_version_id_old = 1,
|
573 |
.fields = (VMStateField []) { |
574 |
VMSTATE_INT64(cpu_ticks_offset, TimersState), |
575 |
VMSTATE_INT64(dummy, TimersState), |
576 |
VMSTATE_INT64_V(cpu_clock_offset, TimersState, 2),
|
577 |
VMSTATE_END_OF_LIST() |
578 |
} |
579 |
}; |
580 |
|
581 |
void configure_icount(const char *option) |
582 |
{ |
583 |
vmstate_register(NULL, 0, &vmstate_timers, &timers_state); |
584 |
if (!option)
|
585 |
return;
|
586 |
|
587 |
if (strcmp(option, "auto") != 0) { |
588 |
icount_time_shift = strtol(option, NULL, 0); |
589 |
use_icount = 1;
|
590 |
return;
|
591 |
} |
592 |
|
593 |
use_icount = 2;
|
594 |
|
595 |
/* 125MIPS seems a reasonable initial guess at the guest speed.
|
596 |
It will be corrected fairly quickly anyway. */
|
597 |
icount_time_shift = 3;
|
598 |
|
599 |
/* Have both realtime and virtual time triggers for speed adjustment.
|
600 |
The realtime trigger catches emulated time passing too slowly,
|
601 |
the virtual time trigger catches emulated time passing too fast.
|
602 |
Realtime triggers occur even when idle, so use them less frequently
|
603 |
than VM triggers. */
|
604 |
icount_rt_timer = qemu_new_timer(rt_clock, icount_adjust_rt, NULL);
|
605 |
qemu_mod_timer(icount_rt_timer, |
606 |
qemu_get_clock(rt_clock) + 1000);
|
607 |
icount_vm_timer = qemu_new_timer(vm_clock, icount_adjust_vm, NULL);
|
608 |
qemu_mod_timer(icount_vm_timer, |
609 |
qemu_get_clock(vm_clock) + get_ticks_per_sec() / 10);
|
610 |
} |
611 |
|
612 |
void qemu_run_all_timers(void) |
613 |
{ |
614 |
alarm_timer->pending = 0;
|
615 |
|
616 |
/* rearm timer, if not periodic */
|
617 |
if (alarm_timer->expired) {
|
618 |
alarm_timer->expired = 0;
|
619 |
qemu_rearm_alarm_timer(alarm_timer); |
620 |
} |
621 |
|
622 |
/* vm time timers */
|
623 |
if (vm_running) {
|
624 |
qemu_run_timers(vm_clock); |
625 |
} |
626 |
|
627 |
qemu_run_timers(rt_clock); |
628 |
qemu_run_timers(host_clock); |
629 |
} |
630 |
|
631 |
static int64_t qemu_next_alarm_deadline(void); |
632 |
|
633 |
#ifdef _WIN32
|
634 |
static void CALLBACK host_alarm_handler(PVOID lpParam, BOOLEAN unused) |
635 |
#else
|
636 |
static void host_alarm_handler(int host_signum) |
637 |
#endif
|
638 |
{ |
639 |
struct qemu_alarm_timer *t = alarm_timer;
|
640 |
if (!t)
|
641 |
return;
|
642 |
|
643 |
#if 0
|
644 |
#define DISP_FREQ 1000
|
645 |
{
|
646 |
static int64_t delta_min = INT64_MAX;
|
647 |
static int64_t delta_max, delta_cum, last_clock, delta, ti;
|
648 |
static int count;
|
649 |
ti = qemu_get_clock(vm_clock);
|
650 |
if (last_clock != 0) {
|
651 |
delta = ti - last_clock;
|
652 |
if (delta < delta_min)
|
653 |
delta_min = delta;
|
654 |
if (delta > delta_max)
|
655 |
delta_max = delta;
|
656 |
delta_cum += delta;
|
657 |
if (++count == DISP_FREQ) {
|
658 |
printf("timer: min=%" PRId64 " us max=%" PRId64 " us avg=%" PRId64 " us avg_freq=%0.3f Hz\n",
|
659 |
muldiv64(delta_min, 1000000, get_ticks_per_sec()),
|
660 |
muldiv64(delta_max, 1000000, get_ticks_per_sec()),
|
661 |
muldiv64(delta_cum, 1000000 / DISP_FREQ, get_ticks_per_sec()),
|
662 |
(double)get_ticks_per_sec() / ((double)delta_cum / DISP_FREQ));
|
663 |
count = 0;
|
664 |
delta_min = INT64_MAX;
|
665 |
delta_max = 0;
|
666 |
delta_cum = 0;
|
667 |
}
|
668 |
}
|
669 |
last_clock = ti;
|
670 |
}
|
671 |
#endif
|
672 |
if (alarm_has_dynticks(t) ||
|
673 |
qemu_next_alarm_deadline () <= 0) {
|
674 |
t->expired = alarm_has_dynticks(t); |
675 |
t->pending = 1;
|
676 |
qemu_notify_event(); |
677 |
} |
678 |
} |
679 |
|
680 |
int64_t qemu_next_deadline(void)
|
681 |
{ |
682 |
/* To avoid problems with overflow limit this to 2^32. */
|
683 |
int64_t delta = INT32_MAX; |
684 |
|
685 |
if (active_timers[QEMU_CLOCK_VIRTUAL]) {
|
686 |
delta = active_timers[QEMU_CLOCK_VIRTUAL]->expire_time - |
687 |
qemu_get_clock_ns(vm_clock); |
688 |
} |
689 |
if (active_timers[QEMU_CLOCK_HOST]) {
|
690 |
int64_t hdelta = active_timers[QEMU_CLOCK_HOST]->expire_time - |
691 |
qemu_get_clock_ns(host_clock); |
692 |
if (hdelta < delta)
|
693 |
delta = hdelta; |
694 |
} |
695 |
|
696 |
if (delta < 0) |
697 |
delta = 0;
|
698 |
|
699 |
return delta;
|
700 |
} |
701 |
|
702 |
static int64_t qemu_next_alarm_deadline(void) |
703 |
{ |
704 |
int64_t delta; |
705 |
int64_t rtdelta; |
706 |
|
707 |
if (!use_icount && active_timers[QEMU_CLOCK_VIRTUAL]) {
|
708 |
delta = active_timers[QEMU_CLOCK_VIRTUAL]->expire_time - |
709 |
qemu_get_clock(vm_clock); |
710 |
} else {
|
711 |
delta = INT32_MAX; |
712 |
} |
713 |
if (active_timers[QEMU_CLOCK_HOST]) {
|
714 |
int64_t hdelta = active_timers[QEMU_CLOCK_HOST]->expire_time - |
715 |
qemu_get_clock_ns(host_clock); |
716 |
if (hdelta < delta)
|
717 |
delta = hdelta; |
718 |
} |
719 |
if (active_timers[QEMU_CLOCK_REALTIME]) {
|
720 |
rtdelta = (active_timers[QEMU_CLOCK_REALTIME]->expire_time * 1000000 -
|
721 |
qemu_get_clock_ns(rt_clock)); |
722 |
if (rtdelta < delta)
|
723 |
delta = rtdelta; |
724 |
} |
725 |
|
726 |
return delta;
|
727 |
} |
728 |
|
729 |
#if defined(__linux__)
|
730 |
|
731 |
#define RTC_FREQ 1024 |
732 |
|
733 |
static void enable_sigio_timer(int fd) |
734 |
{ |
735 |
struct sigaction act;
|
736 |
|
737 |
/* timer signal */
|
738 |
sigfillset(&act.sa_mask); |
739 |
act.sa_flags = 0;
|
740 |
act.sa_handler = host_alarm_handler; |
741 |
|
742 |
sigaction(SIGIO, &act, NULL);
|
743 |
fcntl_setfl(fd, O_ASYNC); |
744 |
fcntl(fd, F_SETOWN, getpid()); |
745 |
} |
746 |
|
747 |
static int hpet_start_timer(struct qemu_alarm_timer *t) |
748 |
{ |
749 |
struct hpet_info info;
|
750 |
int r, fd;
|
751 |
|
752 |
fd = qemu_open("/dev/hpet", O_RDONLY);
|
753 |
if (fd < 0) |
754 |
return -1; |
755 |
|
756 |
/* Set frequency */
|
757 |
r = ioctl(fd, HPET_IRQFREQ, RTC_FREQ); |
758 |
if (r < 0) { |
759 |
fprintf(stderr, "Could not configure '/dev/hpet' to have a 1024Hz timer. This is not a fatal\n"
|
760 |
"error, but for better emulation accuracy type:\n"
|
761 |
"'echo 1024 > /proc/sys/dev/hpet/max-user-freq' as root.\n");
|
762 |
goto fail;
|
763 |
} |
764 |
|
765 |
/* Check capabilities */
|
766 |
r = ioctl(fd, HPET_INFO, &info); |
767 |
if (r < 0) |
768 |
goto fail;
|
769 |
|
770 |
/* Enable periodic mode */
|
771 |
r = ioctl(fd, HPET_EPI, 0);
|
772 |
if (info.hi_flags && (r < 0)) |
773 |
goto fail;
|
774 |
|
775 |
/* Enable interrupt */
|
776 |
r = ioctl(fd, HPET_IE_ON, 0);
|
777 |
if (r < 0) |
778 |
goto fail;
|
779 |
|
780 |
enable_sigio_timer(fd); |
781 |
t->priv = (void *)(long)fd; |
782 |
|
783 |
return 0; |
784 |
fail:
|
785 |
close(fd); |
786 |
return -1; |
787 |
} |
788 |
|
789 |
static void hpet_stop_timer(struct qemu_alarm_timer *t) |
790 |
{ |
791 |
int fd = (long)t->priv; |
792 |
|
793 |
close(fd); |
794 |
} |
795 |
|
796 |
static int rtc_start_timer(struct qemu_alarm_timer *t) |
797 |
{ |
798 |
int rtc_fd;
|
799 |
unsigned long current_rtc_freq = 0; |
800 |
|
801 |
TFR(rtc_fd = qemu_open("/dev/rtc", O_RDONLY));
|
802 |
if (rtc_fd < 0) |
803 |
return -1; |
804 |
ioctl(rtc_fd, RTC_IRQP_READ, ¤t_rtc_freq); |
805 |
if (current_rtc_freq != RTC_FREQ &&
|
806 |
ioctl(rtc_fd, RTC_IRQP_SET, RTC_FREQ) < 0) {
|
807 |
fprintf(stderr, "Could not configure '/dev/rtc' to have a 1024 Hz timer. This is not a fatal\n"
|
808 |
"error, but for better emulation accuracy either use a 2.6 host Linux kernel or\n"
|
809 |
"type 'echo 1024 > /proc/sys/dev/rtc/max-user-freq' as root.\n");
|
810 |
goto fail;
|
811 |
} |
812 |
if (ioctl(rtc_fd, RTC_PIE_ON, 0) < 0) { |
813 |
fail:
|
814 |
close(rtc_fd); |
815 |
return -1; |
816 |
} |
817 |
|
818 |
enable_sigio_timer(rtc_fd); |
819 |
|
820 |
t->priv = (void *)(long)rtc_fd; |
821 |
|
822 |
return 0; |
823 |
} |
824 |
|
825 |
static void rtc_stop_timer(struct qemu_alarm_timer *t) |
826 |
{ |
827 |
int rtc_fd = (long)t->priv; |
828 |
|
829 |
close(rtc_fd); |
830 |
} |
831 |
|
832 |
static int dynticks_start_timer(struct qemu_alarm_timer *t) |
833 |
{ |
834 |
struct sigevent ev;
|
835 |
timer_t host_timer; |
836 |
struct sigaction act;
|
837 |
|
838 |
sigfillset(&act.sa_mask); |
839 |
act.sa_flags = 0;
|
840 |
act.sa_handler = host_alarm_handler; |
841 |
|
842 |
sigaction(SIGALRM, &act, NULL);
|
843 |
|
844 |
/*
|
845 |
* Initialize ev struct to 0 to avoid valgrind complaining
|
846 |
* about uninitialized data in timer_create call
|
847 |
*/
|
848 |
memset(&ev, 0, sizeof(ev)); |
849 |
ev.sigev_value.sival_int = 0;
|
850 |
ev.sigev_notify = SIGEV_SIGNAL; |
851 |
ev.sigev_signo = SIGALRM; |
852 |
|
853 |
if (timer_create(CLOCK_REALTIME, &ev, &host_timer)) {
|
854 |
perror("timer_create");
|
855 |
|
856 |
/* disable dynticks */
|
857 |
fprintf(stderr, "Dynamic Ticks disabled\n");
|
858 |
|
859 |
return -1; |
860 |
} |
861 |
|
862 |
t->priv = (void *)(long)host_timer; |
863 |
|
864 |
return 0; |
865 |
} |
866 |
|
867 |
static void dynticks_stop_timer(struct qemu_alarm_timer *t) |
868 |
{ |
869 |
timer_t host_timer = (timer_t)(long)t->priv;
|
870 |
|
871 |
timer_delete(host_timer); |
872 |
} |
873 |
|
874 |
static void dynticks_rearm_timer(struct qemu_alarm_timer *t) |
875 |
{ |
876 |
timer_t host_timer = (timer_t)(long)t->priv;
|
877 |
struct itimerspec timeout;
|
878 |
int64_t nearest_delta_ns = INT64_MAX; |
879 |
int64_t current_ns; |
880 |
|
881 |
assert(alarm_has_dynticks(t)); |
882 |
if (!active_timers[QEMU_CLOCK_REALTIME] &&
|
883 |
!active_timers[QEMU_CLOCK_VIRTUAL] && |
884 |
!active_timers[QEMU_CLOCK_HOST]) |
885 |
return;
|
886 |
|
887 |
nearest_delta_ns = qemu_next_alarm_deadline(); |
888 |
if (nearest_delta_ns < MIN_TIMER_REARM_NS)
|
889 |
nearest_delta_ns = MIN_TIMER_REARM_NS; |
890 |
|
891 |
/* check whether a timer is already running */
|
892 |
if (timer_gettime(host_timer, &timeout)) {
|
893 |
perror("gettime");
|
894 |
fprintf(stderr, "Internal timer error: aborting\n");
|
895 |
exit(1);
|
896 |
} |
897 |
current_ns = timeout.it_value.tv_sec * 1000000000LL + timeout.it_value.tv_nsec;
|
898 |
if (current_ns && current_ns <= nearest_delta_ns)
|
899 |
return;
|
900 |
|
901 |
timeout.it_interval.tv_sec = 0;
|
902 |
timeout.it_interval.tv_nsec = 0; /* 0 for one-shot timer */ |
903 |
timeout.it_value.tv_sec = nearest_delta_ns / 1000000000;
|
904 |
timeout.it_value.tv_nsec = nearest_delta_ns % 1000000000;
|
905 |
if (timer_settime(host_timer, 0 /* RELATIVE */, &timeout, NULL)) { |
906 |
perror("settime");
|
907 |
fprintf(stderr, "Internal timer error: aborting\n");
|
908 |
exit(1);
|
909 |
} |
910 |
} |
911 |
|
912 |
#endif /* defined(__linux__) */ |
913 |
|
914 |
#if !defined(_WIN32)
|
915 |
|
916 |
static int unix_start_timer(struct qemu_alarm_timer *t) |
917 |
{ |
918 |
struct sigaction act;
|
919 |
struct itimerval itv;
|
920 |
int err;
|
921 |
|
922 |
/* timer signal */
|
923 |
sigfillset(&act.sa_mask); |
924 |
act.sa_flags = 0;
|
925 |
act.sa_handler = host_alarm_handler; |
926 |
|
927 |
sigaction(SIGALRM, &act, NULL);
|
928 |
|
929 |
itv.it_interval.tv_sec = 0;
|
930 |
/* for i386 kernel 2.6 to get 1 ms */
|
931 |
itv.it_interval.tv_usec = 999;
|
932 |
itv.it_value.tv_sec = 0;
|
933 |
itv.it_value.tv_usec = 10 * 1000; |
934 |
|
935 |
err = setitimer(ITIMER_REAL, &itv, NULL);
|
936 |
if (err)
|
937 |
return -1; |
938 |
|
939 |
return 0; |
940 |
} |
941 |
|
942 |
static void unix_stop_timer(struct qemu_alarm_timer *t) |
943 |
{ |
944 |
struct itimerval itv;
|
945 |
|
946 |
memset(&itv, 0, sizeof(itv)); |
947 |
setitimer(ITIMER_REAL, &itv, NULL);
|
948 |
} |
949 |
|
950 |
#endif /* !defined(_WIN32) */ |
951 |
|
952 |
|
953 |
#ifdef _WIN32
|
954 |
|
955 |
static int win32_start_timer(struct qemu_alarm_timer *t) |
956 |
{ |
957 |
HANDLE hTimer; |
958 |
BOOLEAN success; |
959 |
|
960 |
/* If you call ChangeTimerQueueTimer on a one-shot timer (its period
|
961 |
is zero) that has already expired, the timer is not updated. Since
|
962 |
creating a new timer is relatively expensive, set a bogus one-hour
|
963 |
interval in the dynticks case. */
|
964 |
success = CreateTimerQueueTimer(&hTimer, |
965 |
NULL,
|
966 |
host_alarm_handler, |
967 |
t, |
968 |
1,
|
969 |
alarm_has_dynticks(t) ? 3600000 : 1, |
970 |
WT_EXECUTEINTIMERTHREAD); |
971 |
|
972 |
if (!success) {
|
973 |
fprintf(stderr, "Failed to initialize win32 alarm timer: %ld\n",
|
974 |
GetLastError()); |
975 |
return -1; |
976 |
} |
977 |
|
978 |
t->priv = (PVOID) hTimer; |
979 |
return 0; |
980 |
} |
981 |
|
982 |
static void win32_stop_timer(struct qemu_alarm_timer *t) |
983 |
{ |
984 |
HANDLE hTimer = t->priv; |
985 |
|
986 |
if (hTimer) {
|
987 |
DeleteTimerQueueTimer(NULL, hTimer, NULL); |
988 |
} |
989 |
} |
990 |
|
991 |
static void win32_rearm_timer(struct qemu_alarm_timer *t) |
992 |
{ |
993 |
HANDLE hTimer = t->priv; |
994 |
int nearest_delta_ms;
|
995 |
BOOLEAN success; |
996 |
|
997 |
assert(alarm_has_dynticks(t)); |
998 |
if (!active_timers[QEMU_CLOCK_REALTIME] &&
|
999 |
!active_timers[QEMU_CLOCK_VIRTUAL] && |
1000 |
!active_timers[QEMU_CLOCK_HOST]) |
1001 |
return;
|
1002 |
|
1003 |
nearest_delta_ms = (qemu_next_alarm_deadline() + 999999) / 1000000; |
1004 |
if (nearest_delta_ms < 1) { |
1005 |
nearest_delta_ms = 1;
|
1006 |
} |
1007 |
success = ChangeTimerQueueTimer(NULL,
|
1008 |
hTimer, |
1009 |
nearest_delta_ms, |
1010 |
3600000);
|
1011 |
|
1012 |
if (!success) {
|
1013 |
fprintf(stderr, "Failed to rearm win32 alarm timer: %ld\n",
|
1014 |
GetLastError()); |
1015 |
exit(-1);
|
1016 |
} |
1017 |
|
1018 |
} |
1019 |
|
1020 |
#endif /* _WIN32 */ |
1021 |
|
1022 |
static void alarm_timer_on_change_state_rearm(void *opaque, int running, int reason) |
1023 |
{ |
1024 |
if (running)
|
1025 |
qemu_rearm_alarm_timer((struct qemu_alarm_timer *) opaque);
|
1026 |
} |
1027 |
|
1028 |
int init_timer_alarm(void) |
1029 |
{ |
1030 |
struct qemu_alarm_timer *t = NULL; |
1031 |
int i, err = -1; |
1032 |
|
1033 |
for (i = 0; alarm_timers[i].name; i++) { |
1034 |
t = &alarm_timers[i]; |
1035 |
|
1036 |
err = t->start(t); |
1037 |
if (!err)
|
1038 |
break;
|
1039 |
} |
1040 |
|
1041 |
if (err) {
|
1042 |
err = -ENOENT; |
1043 |
goto fail;
|
1044 |
} |
1045 |
|
1046 |
/* first event is at time 0 */
|
1047 |
t->pending = 1;
|
1048 |
alarm_timer = t; |
1049 |
qemu_add_vm_change_state_handler(alarm_timer_on_change_state_rearm, t); |
1050 |
|
1051 |
return 0; |
1052 |
|
1053 |
fail:
|
1054 |
return err;
|
1055 |
} |
1056 |
|
1057 |
void quit_timers(void) |
1058 |
{ |
1059 |
struct qemu_alarm_timer *t = alarm_timer;
|
1060 |
alarm_timer = NULL;
|
1061 |
t->stop(t); |
1062 |
} |
1063 |
|
1064 |
int qemu_calculate_timeout(void) |
1065 |
{ |
1066 |
int timeout;
|
1067 |
int64_t add; |
1068 |
int64_t delta; |
1069 |
|
1070 |
/* When using icount, making forward progress with qemu_icount when the
|
1071 |
guest CPU is idle is critical. We only use the static io-thread timeout
|
1072 |
for non icount runs. */
|
1073 |
if (!use_icount || !vm_running) {
|
1074 |
return 5000; |
1075 |
} |
1076 |
|
1077 |
/* Advance virtual time to the next event. */
|
1078 |
delta = qemu_icount_delta(); |
1079 |
if (delta > 0) { |
1080 |
/* If virtual time is ahead of real time then just
|
1081 |
wait for IO. */
|
1082 |
timeout = (delta + 999999) / 1000000; |
1083 |
} else {
|
1084 |
/* Wait for either IO to occur or the next
|
1085 |
timer event. */
|
1086 |
add = qemu_next_deadline(); |
1087 |
/* We advance the timer before checking for IO.
|
1088 |
Limit the amount we advance so that early IO
|
1089 |
activity won't get the guest too far ahead. */
|
1090 |
if (add > 10000000) |
1091 |
add = 10000000;
|
1092 |
delta += add; |
1093 |
qemu_icount += qemu_icount_round (add); |
1094 |
timeout = delta / 1000000;
|
1095 |
if (timeout < 0) |
1096 |
timeout = 0;
|
1097 |
} |
1098 |
|
1099 |
return timeout;
|
1100 |
} |
1101 |
|