LXR qemu/hw/s390x/tod-qemu.c

   1/*
   2 * TOD (Time Of Day) clock - QEMU implementation
   3 *
   4 * Copyright 2018 Red Hat, Inc.
   5 * Author(s): David Hildenbrand <david@redhat.com>
   6 *
   7 * This work is licensed under the terms of the GNU GPL, version 2 or later.
   8 * See the COPYING file in the top-level directory.
   9 */
  10
  11#include "qemu/osdep.h"
  12#include "qemu-common.h"
  13#include "qapi/error.h"
  14#include "hw/s390x/tod.h"
  15#include "qemu/timer.h"
  16#include "qemu/cutils.h"
  17#include "qemu/module.h"
  18#include "cpu.h"
  19#include "tcg_s390x.h"
  20
  21static void qemu_s390_tod_get(const S390TODState *td, S390TOD *tod,
  22                              Error **errp)
  23{
  24    *tod = td->base;
  25
  26    tod->low += time2tod(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
  27    if (tod->low < td->base.low) {
  28        tod->high++;
  29    }
  30}
  31
  32static void qemu_s390_tod_set(S390TODState *td, const S390TOD *tod,
  33                              Error **errp)
  34{
  35    CPUState *cpu;
  36
  37    td->base = *tod;
  38
  39    td->base.low -= time2tod(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
  40    if (td->base.low > tod->low) {
  41        td->base.high--;
  42    }
  43
  44    /*
  45     * The TOD has been changed and we have to recalculate the CKC values
  46     * for all CPUs. We do this asynchronously, as "SET CLOCK should be
  47     * issued only while all other activity on all CPUs .. has been
  48     * suspended".
  49     */
  50    CPU_FOREACH(cpu) {
  51        async_run_on_cpu(cpu, tcg_s390_tod_updated, RUN_ON_CPU_NULL);
  52    }
  53}
  54
  55static void qemu_s390_tod_class_init(ObjectClass *oc, void *data)
  56{
  57    S390TODClass *tdc = S390_TOD_CLASS(oc);
  58
  59    tdc->get = qemu_s390_tod_get;
  60    tdc->set = qemu_s390_tod_set;
  61}
  62
  63static void qemu_s390_tod_init(Object *obj)
  64{
  65    S390TODState *td = S390_TOD(obj);
  66    struct tm tm;
  67
  68    qemu_get_timedate(&tm, 0);
  69    td->base.high = 0;
  70    td->base.low = TOD_UNIX_EPOCH + (time2tod(mktimegm(&tm)) * 1000000000ULL);
  71    if (td->base.low < TOD_UNIX_EPOCH) {
  72        td->base.high += 1;
  73    }
  74}
  75
  76static TypeInfo qemu_s390_tod_info = {
  77    .name = TYPE_QEMU_S390_TOD,
  78    .parent = TYPE_S390_TOD,
  79    .instance_size = sizeof(S390TODState),
  80    .instance_init = qemu_s390_tod_init,
  81    .class_init = qemu_s390_tod_class_init,
  82    .class_size = sizeof(S390TODClass),
  83};
  84
  85static void register_types(void)
  86{
  87    type_register_static(&qemu_s390_tod_info);
  88}
  89type_init(register_types);
  90