LXR qemu/softmmu/timers-state.h

   1/*
   2 * QEMU System Emulator
   3 *
   4 * Copyright (c) 2003-2008 Fabrice Bellard
   5 *
   6 * Permission is hereby granted, free of charge, to any person obtaining a copy
   7 * of this software and associated documentation files (the "Software"), to deal
   8 * in the Software without restriction, including without limitation the rights
   9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10 * copies of the Software, and to permit persons to whom the Software is
  11 * furnished to do so, subject to the following conditions:
  12 *
  13 * The above copyright notice and this permission notice shall be included in
  14 * all copies or substantial portions of the Software.
  15 *
  16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22 * THE SOFTWARE.
  23 */
  24
  25#ifndef TIMERS_STATE_H
  26#define TIMERS_STATE_H
  27
  28/* timers state, for sharing between icount and cpu-timers */
  29
  30typedef struct TimersState {
  31    /* Protected by BQL.  */
  32    int64_t cpu_ticks_prev;
  33    int64_t cpu_ticks_offset;
  34
  35    /*
  36     * Protect fields that can be respectively read outside the
  37     * BQL, and written from multiple threads.
  38     */
  39    QemuSeqLock vm_clock_seqlock;
  40    QemuSpin vm_clock_lock;
  41
  42    int16_t cpu_ticks_enabled;
  43
  44    /* Conversion factor from emulated instructions to virtual clock ticks.  */
  45    int16_t icount_time_shift;
  46    /* Icount delta used for shift auto adjust. */
  47    int64_t last_delta;
  48
  49    /* Compensate for varying guest execution speed.  */
  50    aligned_int64_t qemu_icount_bias;
  51
  52    int64_t vm_clock_warp_start;
  53    int64_t cpu_clock_offset;
  54
  55    /* Only written by TCG thread */
  56    int64_t qemu_icount;
  57
  58    /* for adjusting icount */
  59    QEMUTimer *icount_rt_timer;
  60    QEMUTimer *icount_vm_timer;
  61    QEMUTimer *icount_warp_timer;
  62} TimersState;
  63
  64extern TimersState timers_state;
  65
  66/*
  67 * icount needs this internal from cpu-timers when adjusting the icount shift.
  68 */
  69int64_t cpu_get_clock_locked(void);
  70
  71#endif /* TIMERS_STATE_H */
  72