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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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}; |
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struct QEMUTimer {
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QEMUClock *clock; |
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int64_t expire_time; /* in nanoseconds */
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int scale;
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QEMUTimerCB *cb; |
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void *opaque;
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struct QEMUTimer *next;
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}; |
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struct qemu_alarm_timer {
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char const *name; |
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int (*start)(struct qemu_alarm_timer *t); |
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void (*stop)(struct qemu_alarm_timer *t); |
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void (*rearm)(struct qemu_alarm_timer *t); |
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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_ns(vm_clock); |
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delta = cur_icount - cur_time; |
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/* FIXME: This is a very crude algorithm, somewhat prone to oscillation. */
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if (delta > 0 |
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&& last_delta + ICOUNT_WOBBLE < delta * 2
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&& icount_time_shift > 0) {
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/* The guest is getting too far ahead. Slow time down. */
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icount_time_shift--; |
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} |
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if (delta < 0 |
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&& last_delta - ICOUNT_WOBBLE > delta * 2
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&& icount_time_shift < MAX_ICOUNT_SHIFT) { |
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/* The guest is getting too far behind. Speed time up. */
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icount_time_shift++; |
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} |
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last_delta = delta; |
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qemu_icount_bias = cur_icount - (qemu_icount << icount_time_shift); |
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} |
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static void icount_adjust_rt(void * opaque) |
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{ |
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qemu_mod_timer(icount_rt_timer, |
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qemu_get_clock_ms(rt_clock) + 1000);
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icount_adjust(); |
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} |
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static void icount_adjust_vm(void * opaque) |
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{ |
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qemu_mod_timer(icount_vm_timer, |
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qemu_get_clock_ns(vm_clock) + get_ticks_per_sec() / 10);
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icount_adjust(); |
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} |
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int64_t qemu_icount_round(int64_t count) |
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{ |
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return (count + (1 << icount_time_shift) - 1) >> icount_time_shift; |
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} |
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static struct qemu_alarm_timer alarm_timers[] = { |
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#ifndef _WIN32
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#ifdef __linux__
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{"dynticks", dynticks_start_timer,
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dynticks_stop_timer, dynticks_rearm_timer, 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); |
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/* Reorder the array */
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name = strtok(arg, ",");
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while (name) {
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for (i = 0; i < count && alarm_timers[i].name; i++) { |
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if (!strcmp(alarm_timers[i].name, name))
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break;
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} |
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if (i == count) {
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fprintf(stderr, "Unknown clock %s\n", name);
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goto next;
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} |
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if (i < cur)
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/* Ignore */
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goto next;
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/* Swap */
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tmp = alarm_timers[i]; |
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alarm_timers[i] = alarm_timers[cur]; |
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alarm_timers[cur] = tmp; |
349 |
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cur++; |
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next:
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name = strtok(NULL, ","); |
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} |
354 |
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qemu_free(arg); |
356 |
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if (cur) {
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/* Disable remaining timers */
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for (i = cur; i < count; i++)
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alarm_timers[i].name = NULL;
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} else {
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show_available_alarms(); |
363 |
exit(1);
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} |
365 |
} |
366 |
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#define QEMU_NUM_CLOCKS 3 |
368 |
|
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QEMUClock *rt_clock; |
370 |
QEMUClock *vm_clock; |
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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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return clock;
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} |
383 |
|
384 |
void qemu_clock_enable(QEMUClock *clock, int enabled) |
385 |
{ |
386 |
clock->enabled = enabled; |
387 |
} |
388 |
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389 |
QEMUTimer *qemu_new_timer(QEMUClock *clock, int scale,
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QEMUTimerCB *cb, void *opaque)
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{ |
392 |
QEMUTimer *ts; |
393 |
|
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ts = qemu_mallocz(sizeof(QEMUTimer));
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395 |
ts->clock = clock; |
396 |
ts->cb = cb; |
397 |
ts->opaque = opaque; |
398 |
ts->scale = scale; |
399 |
return ts;
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400 |
} |
401 |
|
402 |
void qemu_free_timer(QEMUTimer *ts)
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403 |
{ |
404 |
qemu_free(ts); |
405 |
} |
406 |
|
407 |
/* stop a timer, but do not dealloc it */
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408 |
void qemu_del_timer(QEMUTimer *ts)
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409 |
{ |
410 |
QEMUTimer **pt, *t; |
411 |
|
412 |
/* NOTE: this code must be signal safe because
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413 |
qemu_timer_expired() can be called from a signal. */
|
414 |
pt = &active_timers[ts->clock->type]; |
415 |
for(;;) {
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416 |
t = *pt; |
417 |
if (!t)
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418 |
break;
|
419 |
if (t == ts) {
|
420 |
*pt = t->next; |
421 |
break;
|
422 |
} |
423 |
pt = &t->next; |
424 |
} |
425 |
} |
426 |
|
427 |
/* modify the current timer so that it will be fired when current_time
|
428 |
>= expire_time. The corresponding callback will be called. */
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429 |
static void qemu_mod_timer_ns(QEMUTimer *ts, int64_t expire_time) |
430 |
{ |
431 |
QEMUTimer **pt, *t; |
432 |
|
433 |
qemu_del_timer(ts); |
434 |
|
435 |
/* add the timer in the sorted list */
|
436 |
/* NOTE: this code must be signal safe because
|
437 |
qemu_timer_expired() can be called from a signal. */
|
438 |
pt = &active_timers[ts->clock->type]; |
439 |
for(;;) {
|
440 |
t = *pt; |
441 |
if (!t)
|
442 |
break;
|
443 |
if (t->expire_time > expire_time)
|
444 |
break;
|
445 |
pt = &t->next; |
446 |
} |
447 |
ts->expire_time = expire_time; |
448 |
ts->next = *pt; |
449 |
*pt = ts; |
450 |
|
451 |
/* Rearm if necessary */
|
452 |
if (pt == &active_timers[ts->clock->type]) {
|
453 |
if (!alarm_timer->pending) {
|
454 |
qemu_rearm_alarm_timer(alarm_timer); |
455 |
} |
456 |
/* Interrupt execution to force deadline recalculation. */
|
457 |
if (use_icount)
|
458 |
qemu_notify_event(); |
459 |
} |
460 |
} |
461 |
|
462 |
/* modify the current timer so that it will be fired when current_time
|
463 |
>= expire_time. The corresponding callback will be called. */
|
464 |
void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time)
|
465 |
{ |
466 |
qemu_mod_timer_ns(ts, expire_time * ts->scale); |
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 * timer_head->scale);
|
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_ns(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_ns(QEMUClock *clock) |
510 |
{ |
511 |
switch(clock->type) {
|
512 |
case QEMU_CLOCK_REALTIME:
|
513 |
return get_clock();
|
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 |
void init_clocks(void) |
527 |
{ |
528 |
rt_clock = qemu_new_clock(QEMU_CLOCK_REALTIME); |
529 |
vm_clock = qemu_new_clock(QEMU_CLOCK_VIRTUAL); |
530 |
host_clock = qemu_new_clock(QEMU_CLOCK_HOST); |
531 |
|
532 |
rtc_clock = host_clock; |
533 |
} |
534 |
|
535 |
/* save a timer */
|
536 |
void qemu_put_timer(QEMUFile *f, QEMUTimer *ts)
|
537 |
{ |
538 |
uint64_t expire_time; |
539 |
|
540 |
if (qemu_timer_pending(ts)) {
|
541 |
expire_time = ts->expire_time; |
542 |
} else {
|
543 |
expire_time = -1;
|
544 |
} |
545 |
qemu_put_be64(f, expire_time); |
546 |
} |
547 |
|
548 |
void qemu_get_timer(QEMUFile *f, QEMUTimer *ts)
|
549 |
{ |
550 |
uint64_t expire_time; |
551 |
|
552 |
expire_time = qemu_get_be64(f); |
553 |
if (expire_time != -1) { |
554 |
qemu_mod_timer_ns(ts, expire_time); |
555 |
} else {
|
556 |
qemu_del_timer(ts); |
557 |
} |
558 |
} |
559 |
|
560 |
static const VMStateDescription vmstate_timers = { |
561 |
.name = "timer",
|
562 |
.version_id = 2,
|
563 |
.minimum_version_id = 1,
|
564 |
.minimum_version_id_old = 1,
|
565 |
.fields = (VMStateField []) { |
566 |
VMSTATE_INT64(cpu_ticks_offset, TimersState), |
567 |
VMSTATE_INT64(dummy, TimersState), |
568 |
VMSTATE_INT64_V(cpu_clock_offset, TimersState, 2),
|
569 |
VMSTATE_END_OF_LIST() |
570 |
} |
571 |
}; |
572 |
|
573 |
void configure_icount(const char *option) |
574 |
{ |
575 |
vmstate_register(NULL, 0, &vmstate_timers, &timers_state); |
576 |
if (!option)
|
577 |
return;
|
578 |
|
579 |
if (strcmp(option, "auto") != 0) { |
580 |
icount_time_shift = strtol(option, NULL, 0); |
581 |
use_icount = 1;
|
582 |
return;
|
583 |
} |
584 |
|
585 |
use_icount = 2;
|
586 |
|
587 |
/* 125MIPS seems a reasonable initial guess at the guest speed.
|
588 |
It will be corrected fairly quickly anyway. */
|
589 |
icount_time_shift = 3;
|
590 |
|
591 |
/* Have both realtime and virtual time triggers for speed adjustment.
|
592 |
The realtime trigger catches emulated time passing too slowly,
|
593 |
the virtual time trigger catches emulated time passing too fast.
|
594 |
Realtime triggers occur even when idle, so use them less frequently
|
595 |
than VM triggers. */
|
596 |
icount_rt_timer = qemu_new_timer_ms(rt_clock, icount_adjust_rt, NULL);
|
597 |
qemu_mod_timer(icount_rt_timer, |
598 |
qemu_get_clock_ms(rt_clock) + 1000);
|
599 |
icount_vm_timer = qemu_new_timer_ns(vm_clock, icount_adjust_vm, NULL);
|
600 |
qemu_mod_timer(icount_vm_timer, |
601 |
qemu_get_clock_ns(vm_clock) + get_ticks_per_sec() / 10);
|
602 |
} |
603 |
|
604 |
void qemu_run_all_timers(void) |
605 |
{ |
606 |
alarm_timer->pending = 0;
|
607 |
|
608 |
/* rearm timer, if not periodic */
|
609 |
if (alarm_timer->expired) {
|
610 |
alarm_timer->expired = 0;
|
611 |
qemu_rearm_alarm_timer(alarm_timer); |
612 |
} |
613 |
|
614 |
/* vm time timers */
|
615 |
if (vm_running) {
|
616 |
qemu_run_timers(vm_clock); |
617 |
} |
618 |
|
619 |
qemu_run_timers(rt_clock); |
620 |
qemu_run_timers(host_clock); |
621 |
} |
622 |
|
623 |
static int64_t qemu_next_alarm_deadline(void); |
624 |
|
625 |
#ifdef _WIN32
|
626 |
static void CALLBACK host_alarm_handler(PVOID lpParam, BOOLEAN unused) |
627 |
#else
|
628 |
static void host_alarm_handler(int host_signum) |
629 |
#endif
|
630 |
{ |
631 |
struct qemu_alarm_timer *t = alarm_timer;
|
632 |
if (!t)
|
633 |
return;
|
634 |
|
635 |
#if 0
|
636 |
#define DISP_FREQ 1000
|
637 |
{
|
638 |
static int64_t delta_min = INT64_MAX;
|
639 |
static int64_t delta_max, delta_cum, last_clock, delta, ti;
|
640 |
static int count;
|
641 |
ti = qemu_get_clock_ns(vm_clock);
|
642 |
if (last_clock != 0) {
|
643 |
delta = ti - last_clock;
|
644 |
if (delta < delta_min)
|
645 |
delta_min = delta;
|
646 |
if (delta > delta_max)
|
647 |
delta_max = delta;
|
648 |
delta_cum += delta;
|
649 |
if (++count == DISP_FREQ) {
|
650 |
printf("timer: min=%" PRId64 " us max=%" PRId64 " us avg=%" PRId64 " us avg_freq=%0.3f Hz\n",
|
651 |
muldiv64(delta_min, 1000000, get_ticks_per_sec()),
|
652 |
muldiv64(delta_max, 1000000, get_ticks_per_sec()),
|
653 |
muldiv64(delta_cum, 1000000 / DISP_FREQ, get_ticks_per_sec()),
|
654 |
(double)get_ticks_per_sec() / ((double)delta_cum / DISP_FREQ));
|
655 |
count = 0;
|
656 |
delta_min = INT64_MAX;
|
657 |
delta_max = 0;
|
658 |
delta_cum = 0;
|
659 |
}
|
660 |
}
|
661 |
last_clock = ti;
|
662 |
}
|
663 |
#endif
|
664 |
if (alarm_has_dynticks(t) ||
|
665 |
qemu_next_alarm_deadline () <= 0) {
|
666 |
t->expired = alarm_has_dynticks(t); |
667 |
t->pending = 1;
|
668 |
qemu_notify_event(); |
669 |
} |
670 |
} |
671 |
|
672 |
int64_t qemu_next_deadline(void)
|
673 |
{ |
674 |
/* To avoid problems with overflow limit this to 2^32. */
|
675 |
int64_t delta = INT32_MAX; |
676 |
|
677 |
if (active_timers[QEMU_CLOCK_VIRTUAL]) {
|
678 |
delta = active_timers[QEMU_CLOCK_VIRTUAL]->expire_time - |
679 |
qemu_get_clock_ns(vm_clock); |
680 |
} |
681 |
if (active_timers[QEMU_CLOCK_HOST]) {
|
682 |
int64_t hdelta = active_timers[QEMU_CLOCK_HOST]->expire_time - |
683 |
qemu_get_clock_ns(host_clock); |
684 |
if (hdelta < delta)
|
685 |
delta = hdelta; |
686 |
} |
687 |
|
688 |
if (delta < 0) |
689 |
delta = 0;
|
690 |
|
691 |
return delta;
|
692 |
} |
693 |
|
694 |
static int64_t qemu_next_alarm_deadline(void) |
695 |
{ |
696 |
int64_t delta; |
697 |
int64_t rtdelta; |
698 |
|
699 |
if (!use_icount && active_timers[QEMU_CLOCK_VIRTUAL]) {
|
700 |
delta = active_timers[QEMU_CLOCK_VIRTUAL]->expire_time - |
701 |
qemu_get_clock_ns(vm_clock); |
702 |
} else {
|
703 |
delta = INT32_MAX; |
704 |
} |
705 |
if (active_timers[QEMU_CLOCK_HOST]) {
|
706 |
int64_t hdelta = active_timers[QEMU_CLOCK_HOST]->expire_time - |
707 |
qemu_get_clock_ns(host_clock); |
708 |
if (hdelta < delta)
|
709 |
delta = hdelta; |
710 |
} |
711 |
if (active_timers[QEMU_CLOCK_REALTIME]) {
|
712 |
rtdelta = (active_timers[QEMU_CLOCK_REALTIME]->expire_time - |
713 |
qemu_get_clock_ns(rt_clock)); |
714 |
if (rtdelta < delta)
|
715 |
delta = rtdelta; |
716 |
} |
717 |
|
718 |
return delta;
|
719 |
} |
720 |
|
721 |
#if defined(__linux__)
|
722 |
|
723 |
#define RTC_FREQ 1024 |
724 |
|
725 |
static void enable_sigio_timer(int fd) |
726 |
{ |
727 |
struct sigaction act;
|
728 |
|
729 |
/* timer signal */
|
730 |
sigfillset(&act.sa_mask); |
731 |
act.sa_flags = 0;
|
732 |
act.sa_handler = host_alarm_handler; |
733 |
|
734 |
sigaction(SIGIO, &act, NULL);
|
735 |
fcntl_setfl(fd, O_ASYNC); |
736 |
fcntl(fd, F_SETOWN, getpid()); |
737 |
} |
738 |
|
739 |
static int hpet_start_timer(struct qemu_alarm_timer *t) |
740 |
{ |
741 |
struct hpet_info info;
|
742 |
int r, fd;
|
743 |
|
744 |
fd = qemu_open("/dev/hpet", O_RDONLY);
|
745 |
if (fd < 0) |
746 |
return -1; |
747 |
|
748 |
/* Set frequency */
|
749 |
r = ioctl(fd, HPET_IRQFREQ, RTC_FREQ); |
750 |
if (r < 0) { |
751 |
fprintf(stderr, "Could not configure '/dev/hpet' to have a 1024Hz timer. This is not a fatal\n"
|
752 |
"error, but for better emulation accuracy type:\n"
|
753 |
"'echo 1024 > /proc/sys/dev/hpet/max-user-freq' as root.\n");
|
754 |
goto fail;
|
755 |
} |
756 |
|
757 |
/* Check capabilities */
|
758 |
r = ioctl(fd, HPET_INFO, &info); |
759 |
if (r < 0) |
760 |
goto fail;
|
761 |
|
762 |
/* Enable periodic mode */
|
763 |
r = ioctl(fd, HPET_EPI, 0);
|
764 |
if (info.hi_flags && (r < 0)) |
765 |
goto fail;
|
766 |
|
767 |
/* Enable interrupt */
|
768 |
r = ioctl(fd, HPET_IE_ON, 0);
|
769 |
if (r < 0) |
770 |
goto fail;
|
771 |
|
772 |
enable_sigio_timer(fd); |
773 |
t->priv = (void *)(long)fd; |
774 |
|
775 |
return 0; |
776 |
fail:
|
777 |
close(fd); |
778 |
return -1; |
779 |
} |
780 |
|
781 |
static void hpet_stop_timer(struct qemu_alarm_timer *t) |
782 |
{ |
783 |
int fd = (long)t->priv; |
784 |
|
785 |
close(fd); |
786 |
} |
787 |
|
788 |
static int rtc_start_timer(struct qemu_alarm_timer *t) |
789 |
{ |
790 |
int rtc_fd;
|
791 |
unsigned long current_rtc_freq = 0; |
792 |
|
793 |
TFR(rtc_fd = qemu_open("/dev/rtc", O_RDONLY));
|
794 |
if (rtc_fd < 0) |
795 |
return -1; |
796 |
ioctl(rtc_fd, RTC_IRQP_READ, ¤t_rtc_freq); |
797 |
if (current_rtc_freq != RTC_FREQ &&
|
798 |
ioctl(rtc_fd, RTC_IRQP_SET, RTC_FREQ) < 0) {
|
799 |
fprintf(stderr, "Could not configure '/dev/rtc' to have a 1024 Hz timer. This is not a fatal\n"
|
800 |
"error, but for better emulation accuracy either use a 2.6 host Linux kernel or\n"
|
801 |
"type 'echo 1024 > /proc/sys/dev/rtc/max-user-freq' as root.\n");
|
802 |
goto fail;
|
803 |
} |
804 |
if (ioctl(rtc_fd, RTC_PIE_ON, 0) < 0) { |
805 |
fail:
|
806 |
close(rtc_fd); |
807 |
return -1; |
808 |
} |
809 |
|
810 |
enable_sigio_timer(rtc_fd); |
811 |
|
812 |
t->priv = (void *)(long)rtc_fd; |
813 |
|
814 |
return 0; |
815 |
} |
816 |
|
817 |
static void rtc_stop_timer(struct qemu_alarm_timer *t) |
818 |
{ |
819 |
int rtc_fd = (long)t->priv; |
820 |
|
821 |
close(rtc_fd); |
822 |
} |
823 |
|
824 |
static int dynticks_start_timer(struct qemu_alarm_timer *t) |
825 |
{ |
826 |
struct sigevent ev;
|
827 |
timer_t host_timer; |
828 |
struct sigaction act;
|
829 |
|
830 |
sigfillset(&act.sa_mask); |
831 |
act.sa_flags = 0;
|
832 |
act.sa_handler = host_alarm_handler; |
833 |
|
834 |
sigaction(SIGALRM, &act, NULL);
|
835 |
|
836 |
/*
|
837 |
* Initialize ev struct to 0 to avoid valgrind complaining
|
838 |
* about uninitialized data in timer_create call
|
839 |
*/
|
840 |
memset(&ev, 0, sizeof(ev)); |
841 |
ev.sigev_value.sival_int = 0;
|
842 |
ev.sigev_notify = SIGEV_SIGNAL; |
843 |
ev.sigev_signo = SIGALRM; |
844 |
|
845 |
if (timer_create(CLOCK_REALTIME, &ev, &host_timer)) {
|
846 |
perror("timer_create");
|
847 |
|
848 |
/* disable dynticks */
|
849 |
fprintf(stderr, "Dynamic Ticks disabled\n");
|
850 |
|
851 |
return -1; |
852 |
} |
853 |
|
854 |
t->priv = (void *)(long)host_timer; |
855 |
|
856 |
return 0; |
857 |
} |
858 |
|
859 |
static void dynticks_stop_timer(struct qemu_alarm_timer *t) |
860 |
{ |
861 |
timer_t host_timer = (timer_t)(long)t->priv;
|
862 |
|
863 |
timer_delete(host_timer); |
864 |
} |
865 |
|
866 |
static void dynticks_rearm_timer(struct qemu_alarm_timer *t) |
867 |
{ |
868 |
timer_t host_timer = (timer_t)(long)t->priv;
|
869 |
struct itimerspec timeout;
|
870 |
int64_t nearest_delta_ns = INT64_MAX; |
871 |
int64_t current_ns; |
872 |
|
873 |
assert(alarm_has_dynticks(t)); |
874 |
if (!active_timers[QEMU_CLOCK_REALTIME] &&
|
875 |
!active_timers[QEMU_CLOCK_VIRTUAL] && |
876 |
!active_timers[QEMU_CLOCK_HOST]) |
877 |
return;
|
878 |
|
879 |
nearest_delta_ns = qemu_next_alarm_deadline(); |
880 |
if (nearest_delta_ns < MIN_TIMER_REARM_NS)
|
881 |
nearest_delta_ns = MIN_TIMER_REARM_NS; |
882 |
|
883 |
/* check whether a timer is already running */
|
884 |
if (timer_gettime(host_timer, &timeout)) {
|
885 |
perror("gettime");
|
886 |
fprintf(stderr, "Internal timer error: aborting\n");
|
887 |
exit(1);
|
888 |
} |
889 |
current_ns = timeout.it_value.tv_sec * 1000000000LL + timeout.it_value.tv_nsec;
|
890 |
if (current_ns && current_ns <= nearest_delta_ns)
|
891 |
return;
|
892 |
|
893 |
timeout.it_interval.tv_sec = 0;
|
894 |
timeout.it_interval.tv_nsec = 0; /* 0 for one-shot timer */ |
895 |
timeout.it_value.tv_sec = nearest_delta_ns / 1000000000;
|
896 |
timeout.it_value.tv_nsec = nearest_delta_ns % 1000000000;
|
897 |
if (timer_settime(host_timer, 0 /* RELATIVE */, &timeout, NULL)) { |
898 |
perror("settime");
|
899 |
fprintf(stderr, "Internal timer error: aborting\n");
|
900 |
exit(1);
|
901 |
} |
902 |
} |
903 |
|
904 |
#endif /* defined(__linux__) */ |
905 |
|
906 |
#if !defined(_WIN32)
|
907 |
|
908 |
static int unix_start_timer(struct qemu_alarm_timer *t) |
909 |
{ |
910 |
struct sigaction act;
|
911 |
struct itimerval itv;
|
912 |
int err;
|
913 |
|
914 |
/* timer signal */
|
915 |
sigfillset(&act.sa_mask); |
916 |
act.sa_flags = 0;
|
917 |
act.sa_handler = host_alarm_handler; |
918 |
|
919 |
sigaction(SIGALRM, &act, NULL);
|
920 |
|
921 |
itv.it_interval.tv_sec = 0;
|
922 |
/* for i386 kernel 2.6 to get 1 ms */
|
923 |
itv.it_interval.tv_usec = 999;
|
924 |
itv.it_value.tv_sec = 0;
|
925 |
itv.it_value.tv_usec = 10 * 1000; |
926 |
|
927 |
err = setitimer(ITIMER_REAL, &itv, NULL);
|
928 |
if (err)
|
929 |
return -1; |
930 |
|
931 |
return 0; |
932 |
} |
933 |
|
934 |
static void unix_stop_timer(struct qemu_alarm_timer *t) |
935 |
{ |
936 |
struct itimerval itv;
|
937 |
|
938 |
memset(&itv, 0, sizeof(itv)); |
939 |
setitimer(ITIMER_REAL, &itv, NULL);
|
940 |
} |
941 |
|
942 |
#endif /* !defined(_WIN32) */ |
943 |
|
944 |
|
945 |
#ifdef _WIN32
|
946 |
|
947 |
static int win32_start_timer(struct qemu_alarm_timer *t) |
948 |
{ |
949 |
HANDLE hTimer; |
950 |
BOOLEAN success; |
951 |
|
952 |
/* If you call ChangeTimerQueueTimer on a one-shot timer (its period
|
953 |
is zero) that has already expired, the timer is not updated. Since
|
954 |
creating a new timer is relatively expensive, set a bogus one-hour
|
955 |
interval in the dynticks case. */
|
956 |
success = CreateTimerQueueTimer(&hTimer, |
957 |
NULL,
|
958 |
host_alarm_handler, |
959 |
t, |
960 |
1,
|
961 |
alarm_has_dynticks(t) ? 3600000 : 1, |
962 |
WT_EXECUTEINTIMERTHREAD); |
963 |
|
964 |
if (!success) {
|
965 |
fprintf(stderr, "Failed to initialize win32 alarm timer: %ld\n",
|
966 |
GetLastError()); |
967 |
return -1; |
968 |
} |
969 |
|
970 |
t->priv = (PVOID) hTimer; |
971 |
return 0; |
972 |
} |
973 |
|
974 |
static void win32_stop_timer(struct qemu_alarm_timer *t) |
975 |
{ |
976 |
HANDLE hTimer = t->priv; |
977 |
|
978 |
if (hTimer) {
|
979 |
DeleteTimerQueueTimer(NULL, hTimer, NULL); |
980 |
} |
981 |
} |
982 |
|
983 |
static void win32_rearm_timer(struct qemu_alarm_timer *t) |
984 |
{ |
985 |
HANDLE hTimer = t->priv; |
986 |
int nearest_delta_ms;
|
987 |
BOOLEAN success; |
988 |
|
989 |
assert(alarm_has_dynticks(t)); |
990 |
if (!active_timers[QEMU_CLOCK_REALTIME] &&
|
991 |
!active_timers[QEMU_CLOCK_VIRTUAL] && |
992 |
!active_timers[QEMU_CLOCK_HOST]) |
993 |
return;
|
994 |
|
995 |
nearest_delta_ms = (qemu_next_alarm_deadline() + 999999) / 1000000; |
996 |
if (nearest_delta_ms < 1) { |
997 |
nearest_delta_ms = 1;
|
998 |
} |
999 |
success = ChangeTimerQueueTimer(NULL,
|
1000 |
hTimer, |
1001 |
nearest_delta_ms, |
1002 |
3600000);
|
1003 |
|
1004 |
if (!success) {
|
1005 |
fprintf(stderr, "Failed to rearm win32 alarm timer: %ld\n",
|
1006 |
GetLastError()); |
1007 |
exit(-1);
|
1008 |
} |
1009 |
|
1010 |
} |
1011 |
|
1012 |
#endif /* _WIN32 */ |
1013 |
|
1014 |
static void alarm_timer_on_change_state_rearm(void *opaque, int running, int reason) |
1015 |
{ |
1016 |
if (running)
|
1017 |
qemu_rearm_alarm_timer((struct qemu_alarm_timer *) opaque);
|
1018 |
} |
1019 |
|
1020 |
int init_timer_alarm(void) |
1021 |
{ |
1022 |
struct qemu_alarm_timer *t = NULL; |
1023 |
int i, err = -1; |
1024 |
|
1025 |
for (i = 0; alarm_timers[i].name; i++) { |
1026 |
t = &alarm_timers[i]; |
1027 |
|
1028 |
err = t->start(t); |
1029 |
if (!err)
|
1030 |
break;
|
1031 |
} |
1032 |
|
1033 |
if (err) {
|
1034 |
err = -ENOENT; |
1035 |
goto fail;
|
1036 |
} |
1037 |
|
1038 |
/* first event is at time 0 */
|
1039 |
t->pending = 1;
|
1040 |
alarm_timer = t; |
1041 |
qemu_add_vm_change_state_handler(alarm_timer_on_change_state_rearm, t); |
1042 |
|
1043 |
return 0; |
1044 |
|
1045 |
fail:
|
1046 |
return err;
|
1047 |
} |
1048 |
|
1049 |
void quit_timers(void) |
1050 |
{ |
1051 |
struct qemu_alarm_timer *t = alarm_timer;
|
1052 |
alarm_timer = NULL;
|
1053 |
t->stop(t); |
1054 |
} |
1055 |
|
1056 |
int qemu_calculate_timeout(void) |
1057 |
{ |
1058 |
int timeout;
|
1059 |
int64_t add; |
1060 |
int64_t delta; |
1061 |
|
1062 |
/* When using icount, making forward progress with qemu_icount when the
|
1063 |
guest CPU is idle is critical. We only use the static io-thread timeout
|
1064 |
for non icount runs. */
|
1065 |
if (!use_icount || !vm_running) {
|
1066 |
return 5000; |
1067 |
} |
1068 |
|
1069 |
/* Advance virtual time to the next event. */
|
1070 |
delta = qemu_icount_delta(); |
1071 |
if (delta > 0) { |
1072 |
/* If virtual time is ahead of real time then just
|
1073 |
wait for IO. */
|
1074 |
timeout = (delta + 999999) / 1000000; |
1075 |
} else {
|
1076 |
/* Wait for either IO to occur or the next
|
1077 |
timer event. */
|
1078 |
add = qemu_next_deadline(); |
1079 |
/* We advance the timer before checking for IO.
|
1080 |
Limit the amount we advance so that early IO
|
1081 |
activity won't get the guest too far ahead. */
|
1082 |
if (add > 10000000) |
1083 |
add = 10000000;
|
1084 |
delta += add; |
1085 |
qemu_icount += qemu_icount_round (add); |
1086 |
timeout = delta / 1000000;
|
1087 |
if (timeout < 0) |
1088 |
timeout = 0;
|
1089 |
} |
1090 |
|
1091 |
return timeout;
|
1092 |
} |
1093 |
|