LXR qemu/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
  17static bool muldiv_needed(void *opaque)
  18{
  19    Clock *clk = opaque;
  20
  21    return clk->multiplier != 1 || clk->divider != 1;
  22}
  23
  24static 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
  39const VMStateDescription vmstate_muldiv = {
  40    .name = "clock/muldiv",
  41    .version_id = 1,
  42    .minimum_version_id = 1,
  43    .needed = muldiv_needed,
  44    .fields = (VMStateField[]) {
  45        VMSTATE_UINT32(multiplier, Clock),
  46        VMSTATE_UINT32(divider, Clock),
  47    },
  48};
  49
  50const VMStateDescription vmstate_clock = {
  51    .name = "clock",
  52    .version_id = 0,
  53    .minimum_version_id = 0,
  54    .pre_load = clock_pre_load,
  55    .fields = (VMStateField[]) {
  56        VMSTATE_UINT64(period, Clock),
  57        VMSTATE_END_OF_LIST()
  58    },
  59    .subsections = (const VMStateDescription*[]) {
  60        &vmstate_muldiv,
  61        NULL
  62    },
  63};
  64