hw/core/clock-vmstate.c

   1 /*
   2  * Clock migration structure
   3  *
   4  * Copyright GreenSocs 2019-2020
   5  *
   6  * Authors:
   7  *  Damien Hedde
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  10  * See the COPYING file in the top-level directory.
  11  */
  12
  13 #include "qemu/osdep.h"
  14 #include "migration/vmstate.h"
  15 #include "hw/clock.h"
  16
  17 static bool muldiv_needed(void *opaque)
  18 {
  19     Clock *clk = opaque;
  20
  21     return clk->multiplier != 1 || clk->divider != 1;
  22 }
  23
  24 static int clock_pre_load(void *opaque)
  25 {
  26     Clock *clk = opaque;
  27     /*
  28      * The initial out-of-reset settings of the Clock might have been
  29      * configured by the device to be different from what we set
  30      * in clock_initfn(), so we must here set the default values to
  31      * be used if they are not in the inbound migration state.
  32      */
  33     clk->multiplier = 1;
  34     clk->divider = 1;
  35
  36     return 0;
  37 }
  38
  39 const VMStateDescription vmstate_muldiv = {
  40     .name = "clock/muldiv",
  41     .version_id = 1,
  42     .minimum_version_id = 1,
  43     .needed = muldiv_needed,
  44     .fields = (const VMStateField[]) {
  45         VMSTATE_UINT32(multiplier, Clock),
  46         VMSTATE_UINT32(divider, Clock),
  47         VMSTATE_END_OF_LIST()
  48     },
  49 };
  50
  51 const VMStateDescription vmstate_clock = {
  52     .name = "clock",
  53     .version_id = 0,
  54     .minimum_version_id = 0,
  55     .pre_load = clock_pre_load,
  56     .fields = (const VMStateField[]) {
  57         VMSTATE_UINT64(period, Clock),
  58         VMSTATE_END_OF_LIST()
  59     },
  60     .subsections = (const VMStateDescription * const []) {
  61         &vmstate_muldiv,
  62         NULL
  63     },
  64 };