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
  30 typedef 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
  47     /* Compensate for varying guest execution speed.  */
  48     int64_t qemu_icount_bias;
  49
  50     int64_t vm_clock_warp_start;
  51     int64_t cpu_clock_offset;
  52
  53     /* Only written by TCG thread */
  54     int64_t qemu_icount;
  55
  56     /* for adjusting icount */
  57     QEMUTimer *icount_rt_timer;
  58     QEMUTimer *icount_vm_timer;
  59     QEMUTimer *icount_warp_timer;
  60 } TimersState;
  61
  62 extern TimersState timers_state;
  63
  64 /*
  65  * icount needs this internal from cpu-timers when adjusting the icount shift.
  66  */
  67 int64_t cpu_get_clock_locked(void);
  68
  69 #endif /* TIMERS_STATE_H */