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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 __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 "cpu-defs.h" |
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#include "qemu-timer.h" |
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#include "exec-all.h" |
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/* Conversion factor from emulated instructions to virtual clock ticks. */
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static 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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static 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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/* real time host monotonic timer */
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static int64_t get_clock_realtime(void) |
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{ |
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struct timeval tv;
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gettimeofday(&tv, NULL);
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return tv.tv_sec * 1000000000LL + (tv.tv_usec * 1000); |
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} |
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#ifdef WIN32
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static int64_t clock_freq;
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static void init_get_clock(void) |
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{ |
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LARGE_INTEGER freq; |
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int ret;
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ret = QueryPerformanceFrequency(&freq); |
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if (ret == 0) { |
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fprintf(stderr, "Could not calibrate ticks\n");
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exit(1);
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} |
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clock_freq = freq.QuadPart; |
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} |
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static int64_t get_clock(void) |
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{ |
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LARGE_INTEGER ti; |
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QueryPerformanceCounter(&ti); |
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return muldiv64(ti.QuadPart, get_ticks_per_sec(), clock_freq);
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} |
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#else
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static int use_rt_clock; |
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static void init_get_clock(void) |
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{ |
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use_rt_clock = 0;
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#if defined(__linux__) || (defined(__FreeBSD__) && __FreeBSD_version >= 500000) \ |
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|| defined(__DragonFly__) || defined(__FreeBSD_kernel__) |
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{ |
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struct timespec ts;
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if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) { |
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use_rt_clock = 1;
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} |
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} |
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#endif
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} |
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static int64_t get_clock(void) |
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{ |
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#if defined(__linux__) || (defined(__FreeBSD__) && __FreeBSD_version >= 500000) \ |
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|| defined(__DragonFly__) || defined(__FreeBSD_kernel__) |
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if (use_rt_clock) {
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struct timespec ts;
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clock_gettime(CLOCK_MONOTONIC, &ts); |
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return ts.tv_sec * 1000000000LL + ts.tv_nsec; |
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} else
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#endif
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{ |
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/* XXX: using gettimeofday leads to problems if the date
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changes, so it should be avoided. */
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return get_clock_realtime();
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} |
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} |
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#endif
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/* Return the virtual CPU time, based on the instruction counter. */
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static int64_t cpu_get_icount(void) |
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{ |
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int64_t icount; |
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CPUState *env = cpu_single_env;; |
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icount = qemu_icount; |
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if (env) {
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if (!can_do_io(env))
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fprintf(stderr, "Bad clock read\n");
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icount -= (env->icount_decr.u16.low + env->icount_extra); |
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} |
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return qemu_icount_bias + (icount << icount_time_shift);
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} |
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/***********************************************************/
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/* guest cycle counter */
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typedef struct TimersState { |
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int64_t cpu_ticks_prev; |
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int64_t cpu_ticks_offset; |
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int64_t cpu_clock_offset; |
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int32_t cpu_ticks_enabled; |
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int64_t dummy; |
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} TimersState; |
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TimersState timers_state; |
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/* return the host CPU cycle counter and handle stop/restart */
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int64_t cpu_get_ticks(void)
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{ |
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if (use_icount) {
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return cpu_get_icount();
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} |
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if (!timers_state.cpu_ticks_enabled) {
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return timers_state.cpu_ticks_offset;
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} else {
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int64_t ticks; |
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ticks = cpu_get_real_ticks(); |
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if (timers_state.cpu_ticks_prev > ticks) {
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/* Note: non increasing ticks may happen if the host uses
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software suspend */
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timers_state.cpu_ticks_offset += timers_state.cpu_ticks_prev - ticks; |
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} |
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timers_state.cpu_ticks_prev = ticks; |
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return ticks + timers_state.cpu_ticks_offset;
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} |
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} |
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/* return the host CPU monotonic timer and handle stop/restart */
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static int64_t cpu_get_clock(void) |
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{ |
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int64_t ti; |
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if (!timers_state.cpu_ticks_enabled) {
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return timers_state.cpu_clock_offset;
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} else {
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ti = get_clock(); |
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return ti + timers_state.cpu_clock_offset;
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} |
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} |
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#ifndef CONFIG_IOTHREAD
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static int64_t qemu_icount_delta(void) |
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{ |
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if (!use_icount) {
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return 5000 * (int64_t) 1000000; |
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} else if (use_icount == 1) { |
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/* When not using an adaptive execution frequency
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we tend to get badly out of sync with real time,
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so just delay for a reasonable amount of time. */
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return 0; |
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} else {
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return cpu_get_icount() - cpu_get_clock();
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} |
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} |
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#endif
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/* enable cpu_get_ticks() */
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void cpu_enable_ticks(void) |
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{ |
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if (!timers_state.cpu_ticks_enabled) {
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timers_state.cpu_ticks_offset -= cpu_get_real_ticks(); |
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timers_state.cpu_clock_offset -= get_clock(); |
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timers_state.cpu_ticks_enabled = 1;
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} |
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} |
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/* disable cpu_get_ticks() : the clock is stopped. You must not call
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cpu_get_ticks() after that. */
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void cpu_disable_ticks(void) |
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{ |
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if (timers_state.cpu_ticks_enabled) {
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timers_state.cpu_ticks_offset = cpu_get_ticks(); |
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timers_state.cpu_clock_offset = cpu_get_clock(); |
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timers_state.cpu_ticks_enabled = 0;
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} |
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} |
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/***********************************************************/
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/* timers */
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#define QEMU_CLOCK_REALTIME 0 |
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#define QEMU_CLOCK_VIRTUAL 1 |
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#define QEMU_CLOCK_HOST 2 |
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struct QEMUClock {
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int type;
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int enabled;
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/* XXX: add frequency */
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}; |
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struct QEMUTimer {
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QEMUClock *clock; |
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int64_t expire_time; |
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QEMUTimerCB *cb; |
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void *opaque;
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struct QEMUTimer *next;
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}; |
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struct qemu_alarm_timer {
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char const *name; |
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int (*start)(struct qemu_alarm_timer *t); |
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void (*stop)(struct qemu_alarm_timer *t); |
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void (*rearm)(struct qemu_alarm_timer *t); |
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void *priv;
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char expired;
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char pending;
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}; |
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static struct qemu_alarm_timer *alarm_timer; |
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int qemu_alarm_pending(void) |
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{ |
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return alarm_timer->pending;
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} |
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static inline int alarm_has_dynticks(struct qemu_alarm_timer *t) |
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{ |
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return !!t->rearm;
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} |
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static void qemu_rearm_alarm_timer(struct qemu_alarm_timer *t) |
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{ |
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if (!alarm_has_dynticks(t))
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return;
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t->rearm(t); |
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} |
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/* TODO: MIN_TIMER_REARM_US should be optimized */
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#define MIN_TIMER_REARM_US 250 |
289 |
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#ifdef _WIN32
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struct qemu_alarm_win32 {
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MMRESULT timerId; |
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unsigned int period; |
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} alarm_win32_data = {0, 0}; |
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static int win32_start_timer(struct qemu_alarm_timer *t); |
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static void win32_stop_timer(struct qemu_alarm_timer *t); |
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static void win32_rearm_timer(struct qemu_alarm_timer *t); |
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#else
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static int unix_start_timer(struct qemu_alarm_timer *t); |
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static void unix_stop_timer(struct qemu_alarm_timer *t); |
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#ifdef __linux__
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static int dynticks_start_timer(struct qemu_alarm_timer *t); |
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static void dynticks_stop_timer(struct qemu_alarm_timer *t); |
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static void dynticks_rearm_timer(struct qemu_alarm_timer *t); |
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static int hpet_start_timer(struct qemu_alarm_timer *t); |
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static void hpet_stop_timer(struct qemu_alarm_timer *t); |
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static int rtc_start_timer(struct qemu_alarm_timer *t); |
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static void rtc_stop_timer(struct qemu_alarm_timer *t); |
317 |
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#endif /* __linux__ */ |
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#endif /* _WIN32 */ |
321 |
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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) |
327 |
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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; |
333 |
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--; |
347 |
} |
348 |
if (delta < 0 |
349 |
&& last_delta - ICOUNT_WOBBLE > delta * 2
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&& icount_time_shift < MAX_ICOUNT_SHIFT) { |
351 |
/* The guest is getting too far behind. Speed time up. */
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icount_time_shift++; |
353 |
} |
354 |
last_delta = delta; |
355 |
qemu_icount_bias = cur_icount - (qemu_icount << icount_time_shift); |
356 |
} |
357 |
|
358 |
static void icount_adjust_rt(void * opaque) |
359 |
{ |
360 |
qemu_mod_timer(icount_rt_timer, |
361 |
qemu_get_clock(rt_clock) + 1000);
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icount_adjust(); |
363 |
} |
364 |
|
365 |
static void icount_adjust_vm(void * opaque) |
366 |
{ |
367 |
qemu_mod_timer(icount_vm_timer, |
368 |
qemu_get_clock(vm_clock) + get_ticks_per_sec() / 10);
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icount_adjust(); |
370 |
} |
371 |
|
372 |
int64_t qemu_icount_round(int64_t count) |
373 |
{ |
374 |
return (count + (1 << icount_time_shift) - 1) >> icount_time_shift; |
375 |
} |
376 |
|
377 |
static struct qemu_alarm_timer alarm_timers[] = { |
378 |
#ifndef _WIN32
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379 |
#ifdef __linux__
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380 |
{"dynticks", dynticks_start_timer,
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381 |
dynticks_stop_timer, dynticks_rearm_timer, NULL},
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382 |
/* HPET - if available - is preferred */
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383 |
{"hpet", hpet_start_timer, hpet_stop_timer, NULL, NULL}, |
384 |
/* ...otherwise try RTC */
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385 |
{"rtc", rtc_start_timer, rtc_stop_timer, NULL, NULL}, |
386 |
#endif
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387 |
{"unix", unix_start_timer, unix_stop_timer, NULL, NULL}, |
388 |
#else
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389 |
{"dynticks", win32_start_timer,
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390 |
win32_stop_timer, win32_rearm_timer, &alarm_win32_data}, |
391 |
{"win32", win32_start_timer,
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392 |
win32_stop_timer, NULL, &alarm_win32_data},
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393 |
#endif
|
394 |
{NULL, }
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395 |
}; |
396 |
|
397 |
static void show_available_alarms(void) |
398 |
{ |
399 |
int i;
|
400 |
|
401 |
printf("Available alarm timers, in order of precedence:\n");
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402 |
for (i = 0; alarm_timers[i].name; i++) |
403 |
printf("%s\n", alarm_timers[i].name);
|
404 |
} |
405 |
|
406 |
void configure_alarms(char const *opt) |
407 |
{ |
408 |
int i;
|
409 |
int cur = 0; |
410 |
int count = ARRAY_SIZE(alarm_timers) - 1; |
411 |
char *arg;
|
412 |
char *name;
|
413 |
struct qemu_alarm_timer tmp;
|
414 |
|
415 |
if (!strcmp(opt, "?")) { |
416 |
show_available_alarms(); |
417 |
exit(0);
|
418 |
} |
419 |
|
420 |
arg = qemu_strdup(opt); |
421 |
|
422 |
/* Reorder the array */
|
423 |
name = strtok(arg, ",");
|
424 |
while (name) {
|
425 |
for (i = 0; i < count && alarm_timers[i].name; i++) { |
426 |
if (!strcmp(alarm_timers[i].name, name))
|
427 |
break;
|
428 |
} |
429 |
|
430 |
if (i == count) {
|
431 |
fprintf(stderr, "Unknown clock %s\n", name);
|
432 |
goto next;
|
433 |
} |
434 |
|
435 |
if (i < cur)
|
436 |
/* Ignore */
|
437 |
goto next;
|
438 |
|
439 |
/* Swap */
|
440 |
tmp = alarm_timers[i]; |
441 |
alarm_timers[i] = alarm_timers[cur]; |
442 |
alarm_timers[cur] = tmp; |
443 |
|
444 |
cur++; |
445 |
next:
|
446 |
name = strtok(NULL, ","); |
447 |
} |
448 |
|
449 |
qemu_free(arg); |
450 |
|
451 |
if (cur) {
|
452 |
/* Disable remaining timers */
|
453 |
for (i = cur; i < count; i++)
|
454 |
alarm_timers[i].name = NULL;
|
455 |
} else {
|
456 |
show_available_alarms(); |
457 |
exit(1);
|
458 |
} |
459 |
} |
460 |
|
461 |
#define QEMU_NUM_CLOCKS 3 |
462 |
|
463 |
QEMUClock *rt_clock; |
464 |
QEMUClock *vm_clock; |
465 |
QEMUClock *host_clock; |
466 |
|
467 |
static QEMUTimer *active_timers[QEMU_NUM_CLOCKS];
|
468 |
|
469 |
static QEMUClock *qemu_new_clock(int type) |
470 |
{ |
471 |
QEMUClock *clock; |
472 |
clock = qemu_mallocz(sizeof(QEMUClock));
|
473 |
clock->type = type; |
474 |
clock->enabled = 1;
|
475 |
return clock;
|
476 |
} |
477 |
|
478 |
void qemu_clock_enable(QEMUClock *clock, int enabled) |
479 |
{ |
480 |
clock->enabled = enabled; |
481 |
} |
482 |
|
483 |
QEMUTimer *qemu_new_timer(QEMUClock *clock, QEMUTimerCB *cb, void *opaque)
|
484 |
{ |
485 |
QEMUTimer *ts; |
486 |
|
487 |
ts = qemu_mallocz(sizeof(QEMUTimer));
|
488 |
ts->clock = clock; |
489 |
ts->cb = cb; |
490 |
ts->opaque = opaque; |
491 |
return ts;
|
492 |
} |
493 |
|
494 |
void qemu_free_timer(QEMUTimer *ts)
|
495 |
{ |
496 |
qemu_free(ts); |
497 |
} |
498 |
|
499 |
/* stop a timer, but do not dealloc it */
|
500 |
void qemu_del_timer(QEMUTimer *ts)
|
501 |
{ |
502 |
QEMUTimer **pt, *t; |
503 |
|
504 |
/* NOTE: this code must be signal safe because
|
505 |
qemu_timer_expired() can be called from a signal. */
|
506 |
pt = &active_timers[ts->clock->type]; |
507 |
for(;;) {
|
508 |
t = *pt; |
509 |
if (!t)
|
510 |
break;
|
511 |
if (t == ts) {
|
512 |
*pt = t->next; |
513 |
break;
|
514 |
} |
515 |
pt = &t->next; |
516 |
} |
517 |
} |
518 |
|
519 |
/* modify the current timer so that it will be fired when current_time
|
520 |
>= expire_time. The corresponding callback will be called. */
|
521 |
void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time)
|
522 |
{ |
523 |
QEMUTimer **pt, *t; |
524 |
|
525 |
qemu_del_timer(ts); |
526 |
|
527 |
/* add the timer in the sorted list */
|
528 |
/* NOTE: this code must be signal safe because
|
529 |
qemu_timer_expired() can be called from a signal. */
|
530 |
pt = &active_timers[ts->clock->type]; |
531 |
for(;;) {
|
532 |
t = *pt; |
533 |
if (!t)
|
534 |
break;
|
535 |
if (t->expire_time > expire_time)
|
536 |
break;
|
537 |
pt = &t->next; |
538 |
} |
539 |
ts->expire_time = expire_time; |
540 |
ts->next = *pt; |
541 |
*pt = ts; |
542 |
|
543 |
/* Rearm if necessary */
|
544 |
if (pt == &active_timers[ts->clock->type]) {
|
545 |
if (!alarm_timer->pending) {
|
546 |
qemu_rearm_alarm_timer(alarm_timer); |
547 |
} |
548 |
/* Interrupt execution to force deadline recalculation. */
|
549 |
if (use_icount)
|
550 |
qemu_notify_event(); |
551 |
} |
552 |
} |
553 |
|
554 |
int qemu_timer_pending(QEMUTimer *ts)
|
555 |
{ |
556 |
QEMUTimer *t; |
557 |
for(t = active_timers[ts->clock->type]; t != NULL; t = t->next) { |
558 |
if (t == ts)
|
559 |
return 1; |
560 |
} |
561 |
return 0; |
562 |
} |
563 |
|
564 |
int qemu_timer_expired(QEMUTimer *timer_head, int64_t current_time)
|
565 |
{ |
566 |
if (!timer_head)
|
567 |
return 0; |
568 |
return (timer_head->expire_time <= current_time);
|
569 |
} |
570 |
|
571 |
static void qemu_run_timers(QEMUClock *clock) |
572 |
{ |
573 |
QEMUTimer **ptimer_head, *ts; |
574 |
int64_t current_time; |
575 |
|
576 |
if (!clock->enabled)
|
577 |
return;
|
578 |
|
579 |
current_time = qemu_get_clock (clock); |
580 |
ptimer_head = &active_timers[clock->type]; |
581 |
for(;;) {
|
582 |
ts = *ptimer_head; |
583 |
if (!ts || ts->expire_time > current_time)
|
584 |
break;
|
585 |
/* remove timer from the list before calling the callback */
|
586 |
*ptimer_head = ts->next; |
587 |
ts->next = NULL;
|
588 |
|
589 |
/* run the callback (the timer list can be modified) */
|
590 |
ts->cb(ts->opaque); |
591 |
} |
592 |
} |
593 |
|
594 |
int64_t qemu_get_clock(QEMUClock *clock) |
595 |
{ |
596 |
switch(clock->type) {
|
597 |
case QEMU_CLOCK_REALTIME:
|
598 |
return get_clock() / 1000000; |
599 |
default:
|
600 |
case QEMU_CLOCK_VIRTUAL:
|
601 |
if (use_icount) {
|
602 |
return cpu_get_icount();
|
603 |
} else {
|
604 |
return cpu_get_clock();
|
605 |
} |
606 |
case QEMU_CLOCK_HOST:
|
607 |
return get_clock_realtime();
|
608 |
} |
609 |
} |
610 |
|
611 |
int64_t qemu_get_clock_ns(QEMUClock *clock) |
612 |
{ |
613 |
switch(clock->type) {
|
614 |
case QEMU_CLOCK_REALTIME:
|
615 |
return get_clock();
|
616 |
default:
|
617 |
case QEMU_CLOCK_VIRTUAL:
|
618 |
if (use_icount) {
|
619 |
return cpu_get_icount();
|
620 |
} else {
|
621 |
return cpu_get_clock();
|
622 |
} |
623 |
case QEMU_CLOCK_HOST:
|
624 |
return get_clock_realtime();
|
625 |
} |
626 |
} |
627 |
|
628 |
void init_clocks(void) |
629 |
{ |
630 |
init_get_clock(); |
631 |
rt_clock = qemu_new_clock(QEMU_CLOCK_REALTIME); |
632 |
vm_clock = qemu_new_clock(QEMU_CLOCK_VIRTUAL); |
633 |
host_clock = qemu_new_clock(QEMU_CLOCK_HOST); |
634 |
|
635 |
rtc_clock = host_clock; |
636 |
} |
637 |
|
638 |
/* save a timer */
|
639 |
void qemu_put_timer(QEMUFile *f, QEMUTimer *ts)
|
640 |
{ |
641 |
uint64_t expire_time; |
642 |
|
643 |
if (qemu_timer_pending(ts)) {
|
644 |
expire_time = ts->expire_time; |
645 |
} else {
|
646 |
expire_time = -1;
|
647 |
} |
648 |
qemu_put_be64(f, expire_time); |
649 |
} |
650 |
|
651 |
void qemu_get_timer(QEMUFile *f, QEMUTimer *ts)
|
652 |
{ |
653 |
uint64_t expire_time; |
654 |
|
655 |
expire_time = qemu_get_be64(f); |
656 |
if (expire_time != -1) { |
657 |
qemu_mod_timer(ts, expire_time); |
658 |
} else {
|
659 |
qemu_del_timer(ts); |
660 |
} |
661 |
} |
662 |
|
663 |
static const VMStateDescription vmstate_timers = { |
664 |
.name = "timer",
|
665 |
.version_id = 2,
|
666 |
.minimum_version_id = 1,
|
667 |
.minimum_version_id_old = 1,
|
668 |
.fields = (VMStateField []) { |
669 |
VMSTATE_INT64(cpu_ticks_offset, TimersState), |
670 |
VMSTATE_INT64(dummy, TimersState), |
671 |
VMSTATE_INT64_V(cpu_clock_offset, TimersState, 2),
|
672 |
VMSTATE_END_OF_LIST() |
673 |
} |
674 |
}; |
675 |
|
676 |
void configure_icount(const char *option) |
677 |
{ |
678 |
vmstate_register(0, &vmstate_timers, &timers_state);
|
679 |
if (!option)
|
680 |
return;
|
681 |
|
682 |
if (strcmp(option, "auto") != 0) { |
683 |
icount_time_shift = strtol(option, NULL, 0); |
684 |
use_icount = 1;
|
685 |
return;
|
686 |
} |
687 |
|
688 |
use_icount = 2;
|
689 |
|
690 |
/* 125MIPS seems a reasonable initial guess at the guest speed.
|
691 |
It will be corrected fairly quickly anyway. */
|
692 |
icount_time_shift = 3;
|
693 |
|
694 |
/* Have both realtime and virtual time triggers for speed adjustment.
|
695 |
The realtime trigger catches emulated time passing too slowly,
|
696 |
the virtual time trigger catches emulated time passing too fast.
|
697 |
Realtime triggers occur even when idle, so use them less frequently
|
698 |
than VM triggers. */
|
699 |
icount_rt_timer = qemu_new_timer(rt_clock, icount_adjust_rt, NULL);
|
700 |
qemu_mod_timer(icount_rt_timer, |
701 |
qemu_get_clock(rt_clock) + 1000);
|
702 |
icount_vm_timer = qemu_new_timer(vm_clock, icount_adjust_vm, NULL);
|
703 |
qemu_mod_timer(icount_vm_timer, |
704 |
qemu_get_clock(vm_clock) + get_ticks_per_sec() / 10);
|
705 |
} |
706 |
|
707 |
void qemu_run_all_timers(void) |
708 |
{ |
709 |
/* rearm timer, if not periodic */
|
710 |
if (alarm_timer->expired) {
|
711 |
alarm_timer->expired = 0;
|
712 |
qemu_rearm_alarm_timer(alarm_timer); |
713 |
} |
714 |
|
715 |
alarm_timer->pending = 0;
|
716 |
|
717 |
/* vm time timers */
|
718 |
if (vm_running) {
|
719 |
qemu_run_timers(vm_clock); |
720 |
} |
721 |
|
722 |
qemu_run_timers(rt_clock); |
723 |
qemu_run_timers(host_clock); |
724 |
} |
725 |
|
726 |
#ifdef _WIN32
|
727 |
static void CALLBACK host_alarm_handler(UINT uTimerID, UINT uMsg, |
728 |
DWORD_PTR dwUser, DWORD_PTR dw1, |
729 |
DWORD_PTR dw2) |
730 |
#else
|
731 |
static void host_alarm_handler(int host_signum) |
732 |
#endif
|
733 |
{ |
734 |
struct qemu_alarm_timer *t = alarm_timer;
|
735 |
if (!t)
|
736 |
return;
|
737 |
|
738 |
#if 0
|
739 |
#define DISP_FREQ 1000
|
740 |
{
|
741 |
static int64_t delta_min = INT64_MAX;
|
742 |
static int64_t delta_max, delta_cum, last_clock, delta, ti;
|
743 |
static int count;
|
744 |
ti = qemu_get_clock(vm_clock);
|
745 |
if (last_clock != 0) {
|
746 |
delta = ti - last_clock;
|
747 |
if (delta < delta_min)
|
748 |
delta_min = delta;
|
749 |
if (delta > delta_max)
|
750 |
delta_max = delta;
|
751 |
delta_cum += delta;
|
752 |
if (++count == DISP_FREQ) {
|
753 |
printf("timer: min=%" PRId64 " us max=%" PRId64 " us avg=%" PRId64 " us avg_freq=%0.3f Hz\n",
|
754 |
muldiv64(delta_min, 1000000, get_ticks_per_sec()),
|
755 |
muldiv64(delta_max, 1000000, get_ticks_per_sec()),
|
756 |
muldiv64(delta_cum, 1000000 / DISP_FREQ, get_ticks_per_sec()),
|
757 |
(double)get_ticks_per_sec() / ((double)delta_cum / DISP_FREQ));
|
758 |
count = 0;
|
759 |
delta_min = INT64_MAX;
|
760 |
delta_max = 0;
|
761 |
delta_cum = 0;
|
762 |
}
|
763 |
}
|
764 |
last_clock = ti;
|
765 |
}
|
766 |
#endif
|
767 |
if (alarm_has_dynticks(t) ||
|
768 |
(!use_icount && |
769 |
qemu_timer_expired(active_timers[QEMU_CLOCK_VIRTUAL], |
770 |
qemu_get_clock(vm_clock))) || |
771 |
qemu_timer_expired(active_timers[QEMU_CLOCK_REALTIME], |
772 |
qemu_get_clock(rt_clock)) || |
773 |
qemu_timer_expired(active_timers[QEMU_CLOCK_HOST], |
774 |
qemu_get_clock(host_clock))) { |
775 |
|
776 |
t->expired = alarm_has_dynticks(t); |
777 |
t->pending = 1;
|
778 |
qemu_notify_event(); |
779 |
} |
780 |
} |
781 |
|
782 |
int64_t qemu_next_deadline(void)
|
783 |
{ |
784 |
/* To avoid problems with overflow limit this to 2^32. */
|
785 |
int64_t delta = INT32_MAX; |
786 |
|
787 |
if (active_timers[QEMU_CLOCK_VIRTUAL]) {
|
788 |
delta = active_timers[QEMU_CLOCK_VIRTUAL]->expire_time - |
789 |
qemu_get_clock(vm_clock); |
790 |
} |
791 |
if (active_timers[QEMU_CLOCK_HOST]) {
|
792 |
int64_t hdelta = active_timers[QEMU_CLOCK_HOST]->expire_time - |
793 |
qemu_get_clock(host_clock); |
794 |
if (hdelta < delta)
|
795 |
delta = hdelta; |
796 |
} |
797 |
|
798 |
if (delta < 0) |
799 |
delta = 0;
|
800 |
|
801 |
return delta;
|
802 |
} |
803 |
|
804 |
#ifndef _WIN32
|
805 |
|
806 |
#if defined(__linux__)
|
807 |
|
808 |
#define RTC_FREQ 1024 |
809 |
|
810 |
static uint64_t qemu_next_deadline_dyntick(void) |
811 |
{ |
812 |
int64_t delta; |
813 |
int64_t rtdelta; |
814 |
|
815 |
if (use_icount)
|
816 |
delta = INT32_MAX; |
817 |
else
|
818 |
delta = (qemu_next_deadline() + 999) / 1000; |
819 |
|
820 |
if (active_timers[QEMU_CLOCK_REALTIME]) {
|
821 |
rtdelta = (active_timers[QEMU_CLOCK_REALTIME]->expire_time - |
822 |
qemu_get_clock(rt_clock))*1000;
|
823 |
if (rtdelta < delta)
|
824 |
delta = rtdelta; |
825 |
} |
826 |
|
827 |
if (delta < MIN_TIMER_REARM_US)
|
828 |
delta = MIN_TIMER_REARM_US; |
829 |
|
830 |
return delta;
|
831 |
} |
832 |
|
833 |
static void enable_sigio_timer(int fd) |
834 |
{ |
835 |
struct sigaction act;
|
836 |
|
837 |
/* timer signal */
|
838 |
sigfillset(&act.sa_mask); |
839 |
act.sa_flags = 0;
|
840 |
act.sa_handler = host_alarm_handler; |
841 |
|
842 |
sigaction(SIGIO, &act, NULL);
|
843 |
fcntl_setfl(fd, O_ASYNC); |
844 |
fcntl(fd, F_SETOWN, getpid()); |
845 |
} |
846 |
|
847 |
static int hpet_start_timer(struct qemu_alarm_timer *t) |
848 |
{ |
849 |
struct hpet_info info;
|
850 |
int r, fd;
|
851 |
|
852 |
fd = qemu_open("/dev/hpet", O_RDONLY);
|
853 |
if (fd < 0) |
854 |
return -1; |
855 |
|
856 |
/* Set frequency */
|
857 |
r = ioctl(fd, HPET_IRQFREQ, RTC_FREQ); |
858 |
if (r < 0) { |
859 |
fprintf(stderr, "Could not configure '/dev/hpet' to have a 1024Hz timer. This is not a fatal\n"
|
860 |
"error, but for better emulation accuracy type:\n"
|
861 |
"'echo 1024 > /proc/sys/dev/hpet/max-user-freq' as root.\n");
|
862 |
goto fail;
|
863 |
} |
864 |
|
865 |
/* Check capabilities */
|
866 |
r = ioctl(fd, HPET_INFO, &info); |
867 |
if (r < 0) |
868 |
goto fail;
|
869 |
|
870 |
/* Enable periodic mode */
|
871 |
r = ioctl(fd, HPET_EPI, 0);
|
872 |
if (info.hi_flags && (r < 0)) |
873 |
goto fail;
|
874 |
|
875 |
/* Enable interrupt */
|
876 |
r = ioctl(fd, HPET_IE_ON, 0);
|
877 |
if (r < 0) |
878 |
goto fail;
|
879 |
|
880 |
enable_sigio_timer(fd); |
881 |
t->priv = (void *)(long)fd; |
882 |
|
883 |
return 0; |
884 |
fail:
|
885 |
close(fd); |
886 |
return -1; |
887 |
} |
888 |
|
889 |
static void hpet_stop_timer(struct qemu_alarm_timer *t) |
890 |
{ |
891 |
int fd = (long)t->priv; |
892 |
|
893 |
close(fd); |
894 |
} |
895 |
|
896 |
static int rtc_start_timer(struct qemu_alarm_timer *t) |
897 |
{ |
898 |
int rtc_fd;
|
899 |
unsigned long current_rtc_freq = 0; |
900 |
|
901 |
TFR(rtc_fd = qemu_open("/dev/rtc", O_RDONLY));
|
902 |
if (rtc_fd < 0) |
903 |
return -1; |
904 |
ioctl(rtc_fd, RTC_IRQP_READ, ¤t_rtc_freq); |
905 |
if (current_rtc_freq != RTC_FREQ &&
|
906 |
ioctl(rtc_fd, RTC_IRQP_SET, RTC_FREQ) < 0) {
|
907 |
fprintf(stderr, "Could not configure '/dev/rtc' to have a 1024 Hz timer. This is not a fatal\n"
|
908 |
"error, but for better emulation accuracy either use a 2.6 host Linux kernel or\n"
|
909 |
"type 'echo 1024 > /proc/sys/dev/rtc/max-user-freq' as root.\n");
|
910 |
goto fail;
|
911 |
} |
912 |
if (ioctl(rtc_fd, RTC_PIE_ON, 0) < 0) { |
913 |
fail:
|
914 |
close(rtc_fd); |
915 |
return -1; |
916 |
} |
917 |
|
918 |
enable_sigio_timer(rtc_fd); |
919 |
|
920 |
t->priv = (void *)(long)rtc_fd; |
921 |
|
922 |
return 0; |
923 |
} |
924 |
|
925 |
static void rtc_stop_timer(struct qemu_alarm_timer *t) |
926 |
{ |
927 |
int rtc_fd = (long)t->priv; |
928 |
|
929 |
close(rtc_fd); |
930 |
} |
931 |
|
932 |
static int dynticks_start_timer(struct qemu_alarm_timer *t) |
933 |
{ |
934 |
struct sigevent ev;
|
935 |
timer_t host_timer; |
936 |
struct sigaction act;
|
937 |
|
938 |
sigfillset(&act.sa_mask); |
939 |
act.sa_flags = 0;
|
940 |
act.sa_handler = host_alarm_handler; |
941 |
|
942 |
sigaction(SIGALRM, &act, NULL);
|
943 |
|
944 |
/*
|
945 |
* Initialize ev struct to 0 to avoid valgrind complaining
|
946 |
* about uninitialized data in timer_create call
|
947 |
*/
|
948 |
memset(&ev, 0, sizeof(ev)); |
949 |
ev.sigev_value.sival_int = 0;
|
950 |
ev.sigev_notify = SIGEV_SIGNAL; |
951 |
ev.sigev_signo = SIGALRM; |
952 |
|
953 |
if (timer_create(CLOCK_REALTIME, &ev, &host_timer)) {
|
954 |
perror("timer_create");
|
955 |
|
956 |
/* disable dynticks */
|
957 |
fprintf(stderr, "Dynamic Ticks disabled\n");
|
958 |
|
959 |
return -1; |
960 |
} |
961 |
|
962 |
t->priv = (void *)(long)host_timer; |
963 |
|
964 |
return 0; |
965 |
} |
966 |
|
967 |
static void dynticks_stop_timer(struct qemu_alarm_timer *t) |
968 |
{ |
969 |
timer_t host_timer = (timer_t)(long)t->priv;
|
970 |
|
971 |
timer_delete(host_timer); |
972 |
} |
973 |
|
974 |
static void dynticks_rearm_timer(struct qemu_alarm_timer *t) |
975 |
{ |
976 |
timer_t host_timer = (timer_t)(long)t->priv;
|
977 |
struct itimerspec timeout;
|
978 |
int64_t nearest_delta_us = INT64_MAX; |
979 |
int64_t current_us; |
980 |
|
981 |
assert(alarm_has_dynticks(t)); |
982 |
if (!active_timers[QEMU_CLOCK_REALTIME] &&
|
983 |
!active_timers[QEMU_CLOCK_VIRTUAL] && |
984 |
!active_timers[QEMU_CLOCK_HOST]) |
985 |
return;
|
986 |
|
987 |
nearest_delta_us = qemu_next_deadline_dyntick(); |
988 |
|
989 |
/* check whether a timer is already running */
|
990 |
if (timer_gettime(host_timer, &timeout)) {
|
991 |
perror("gettime");
|
992 |
fprintf(stderr, "Internal timer error: aborting\n");
|
993 |
exit(1);
|
994 |
} |
995 |
current_us = timeout.it_value.tv_sec * 1000000 + timeout.it_value.tv_nsec/1000; |
996 |
if (current_us && current_us <= nearest_delta_us)
|
997 |
return;
|
998 |
|
999 |
timeout.it_interval.tv_sec = 0;
|
1000 |
timeout.it_interval.tv_nsec = 0; /* 0 for one-shot timer */ |
1001 |
timeout.it_value.tv_sec = nearest_delta_us / 1000000;
|
1002 |
timeout.it_value.tv_nsec = (nearest_delta_us % 1000000) * 1000; |
1003 |
if (timer_settime(host_timer, 0 /* RELATIVE */, &timeout, NULL)) { |
1004 |
perror("settime");
|
1005 |
fprintf(stderr, "Internal timer error: aborting\n");
|
1006 |
exit(1);
|
1007 |
} |
1008 |
} |
1009 |
|
1010 |
#endif /* defined(__linux__) */ |
1011 |
|
1012 |
static int unix_start_timer(struct qemu_alarm_timer *t) |
1013 |
{ |
1014 |
struct sigaction act;
|
1015 |
struct itimerval itv;
|
1016 |
int err;
|
1017 |
|
1018 |
/* timer signal */
|
1019 |
sigfillset(&act.sa_mask); |
1020 |
act.sa_flags = 0;
|
1021 |
act.sa_handler = host_alarm_handler; |
1022 |
|
1023 |
sigaction(SIGALRM, &act, NULL);
|
1024 |
|
1025 |
itv.it_interval.tv_sec = 0;
|
1026 |
/* for i386 kernel 2.6 to get 1 ms */
|
1027 |
itv.it_interval.tv_usec = 999;
|
1028 |
itv.it_value.tv_sec = 0;
|
1029 |
itv.it_value.tv_usec = 10 * 1000; |
1030 |
|
1031 |
err = setitimer(ITIMER_REAL, &itv, NULL);
|
1032 |
if (err)
|
1033 |
return -1; |
1034 |
|
1035 |
return 0; |
1036 |
} |
1037 |
|
1038 |
static void unix_stop_timer(struct qemu_alarm_timer *t) |
1039 |
{ |
1040 |
struct itimerval itv;
|
1041 |
|
1042 |
memset(&itv, 0, sizeof(itv)); |
1043 |
setitimer(ITIMER_REAL, &itv, NULL);
|
1044 |
} |
1045 |
|
1046 |
#endif /* !defined(_WIN32) */ |
1047 |
|
1048 |
|
1049 |
#ifdef _WIN32
|
1050 |
|
1051 |
static int win32_start_timer(struct qemu_alarm_timer *t) |
1052 |
{ |
1053 |
TIMECAPS tc; |
1054 |
struct qemu_alarm_win32 *data = t->priv;
|
1055 |
UINT flags; |
1056 |
|
1057 |
memset(&tc, 0, sizeof(tc)); |
1058 |
timeGetDevCaps(&tc, sizeof(tc));
|
1059 |
|
1060 |
data->period = tc.wPeriodMin; |
1061 |
timeBeginPeriod(data->period); |
1062 |
|
1063 |
flags = TIME_CALLBACK_FUNCTION; |
1064 |
if (alarm_has_dynticks(t))
|
1065 |
flags |= TIME_ONESHOT; |
1066 |
else
|
1067 |
flags |= TIME_PERIODIC; |
1068 |
|
1069 |
data->timerId = timeSetEvent(1, // interval (ms) |
1070 |
data->period, // resolution
|
1071 |
host_alarm_handler, // function
|
1072 |
(DWORD)t, // parameter
|
1073 |
flags); |
1074 |
|
1075 |
if (!data->timerId) {
|
1076 |
fprintf(stderr, "Failed to initialize win32 alarm timer: %ld\n",
|
1077 |
GetLastError()); |
1078 |
timeEndPeriod(data->period); |
1079 |
return -1; |
1080 |
} |
1081 |
|
1082 |
return 0; |
1083 |
} |
1084 |
|
1085 |
static void win32_stop_timer(struct qemu_alarm_timer *t) |
1086 |
{ |
1087 |
struct qemu_alarm_win32 *data = t->priv;
|
1088 |
|
1089 |
timeKillEvent(data->timerId); |
1090 |
timeEndPeriod(data->period); |
1091 |
} |
1092 |
|
1093 |
static void win32_rearm_timer(struct qemu_alarm_timer *t) |
1094 |
{ |
1095 |
struct qemu_alarm_win32 *data = t->priv;
|
1096 |
|
1097 |
assert(alarm_has_dynticks(t)); |
1098 |
if (!active_timers[QEMU_CLOCK_REALTIME] &&
|
1099 |
!active_timers[QEMU_CLOCK_VIRTUAL] && |
1100 |
!active_timers[QEMU_CLOCK_HOST]) |
1101 |
return;
|
1102 |
|
1103 |
timeKillEvent(data->timerId); |
1104 |
|
1105 |
data->timerId = timeSetEvent(1,
|
1106 |
data->period, |
1107 |
host_alarm_handler, |
1108 |
(DWORD)t, |
1109 |
TIME_ONESHOT | TIME_CALLBACK_FUNCTION); |
1110 |
|
1111 |
if (!data->timerId) {
|
1112 |
fprintf(stderr, "Failed to re-arm win32 alarm timer %ld\n",
|
1113 |
GetLastError()); |
1114 |
|
1115 |
timeEndPeriod(data->period); |
1116 |
exit(1);
|
1117 |
} |
1118 |
} |
1119 |
|
1120 |
#endif /* _WIN32 */ |
1121 |
|
1122 |
static void alarm_timer_on_change_state_rearm(void *opaque, int running, int reason) |
1123 |
{ |
1124 |
if (running)
|
1125 |
qemu_rearm_alarm_timer((struct qemu_alarm_timer *) opaque);
|
1126 |
} |
1127 |
|
1128 |
int init_timer_alarm(void) |
1129 |
{ |
1130 |
struct qemu_alarm_timer *t = NULL; |
1131 |
int i, err = -1; |
1132 |
|
1133 |
for (i = 0; alarm_timers[i].name; i++) { |
1134 |
t = &alarm_timers[i]; |
1135 |
|
1136 |
err = t->start(t); |
1137 |
if (!err)
|
1138 |
break;
|
1139 |
} |
1140 |
|
1141 |
if (err) {
|
1142 |
err = -ENOENT; |
1143 |
goto fail;
|
1144 |
} |
1145 |
|
1146 |
/* first event is at time 0 */
|
1147 |
t->pending = 1;
|
1148 |
alarm_timer = t; |
1149 |
qemu_add_vm_change_state_handler(alarm_timer_on_change_state_rearm, t); |
1150 |
|
1151 |
return 0; |
1152 |
|
1153 |
fail:
|
1154 |
return err;
|
1155 |
} |
1156 |
|
1157 |
void quit_timers(void) |
1158 |
{ |
1159 |
struct qemu_alarm_timer *t = alarm_timer;
|
1160 |
alarm_timer = NULL;
|
1161 |
t->stop(t); |
1162 |
} |
1163 |
|
1164 |
int qemu_calculate_timeout(void) |
1165 |
{ |
1166 |
#ifndef CONFIG_IOTHREAD
|
1167 |
int timeout;
|
1168 |
|
1169 |
if (!vm_running)
|
1170 |
timeout = 5000;
|
1171 |
else {
|
1172 |
/* XXX: use timeout computed from timers */
|
1173 |
int64_t add; |
1174 |
int64_t delta; |
1175 |
/* Advance virtual time to the next event. */
|
1176 |
delta = qemu_icount_delta(); |
1177 |
if (delta > 0) { |
1178 |
/* If virtual time is ahead of real time then just
|
1179 |
wait for IO. */
|
1180 |
timeout = (delta + 999999) / 1000000; |
1181 |
} else {
|
1182 |
/* Wait for either IO to occur or the next
|
1183 |
timer event. */
|
1184 |
add = qemu_next_deadline(); |
1185 |
/* We advance the timer before checking for IO.
|
1186 |
Limit the amount we advance so that early IO
|
1187 |
activity won't get the guest too far ahead. */
|
1188 |
if (add > 10000000) |
1189 |
add = 10000000;
|
1190 |
delta += add; |
1191 |
qemu_icount += qemu_icount_round (add); |
1192 |
timeout = delta / 1000000;
|
1193 |
if (timeout < 0) |
1194 |
timeout = 0;
|
1195 |
} |
1196 |
} |
1197 |
|
1198 |
return timeout;
|
1199 |
#else /* CONFIG_IOTHREAD */ |
1200 |
return 1000; |
1201 |
#endif
|
1202 |
} |
1203 |
|