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 "qapi/error.h"
  13#include "hw/s390x/tod.h"
  14#include "qemu/timer.h"
  15#include "qemu/cutils.h"
  16#include "cpu.h"
  17#include "tcg_s390x.h"
  18
  19static void qemu_s390_tod_get(const S390TODState *td, S390TOD *tod,
  20                              Error **errp)
  21{
  22    *tod = td->base;
  23
  24    tod->low += time2tod(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
  25    if (tod->low < td->base.low) {
  26        tod->high++;
  27    }
  28}
  29
  30static void qemu_s390_tod_set(S390TODState *td, const S390TOD *tod,
  31                              Error **errp)
  32{
  33    CPUState *cpu;
  34
  35    td->base = *tod;
  36
  37    td->base.low -= time2tod(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
  38    if (td->base.low > tod->low) {
  39        td->base.high--;
  40    }
  41
  42    /*
  43     * The TOD has been changed and we have to recalculate the CKC values
  44     * for all CPUs. We do this asynchronously, as "SET CLOCK should be
  45     * issued only while all other activity on all CPUs .. has been
  46     * suspended".
  47     */
  48    CPU_FOREACH(cpu) {
  49        async_run_on_cpu(cpu, tcg_s390_tod_updated, RUN_ON_CPU_NULL);
  50    }
  51}
  52
  53static void qemu_s390_tod_class_init(ObjectClass *oc, void *data)
  54{
  55    S390TODClass *tdc = S390_TOD_CLASS(oc);
  56
  57    tdc->get = qemu_s390_tod_get;
  58    tdc->set = qemu_s390_tod_set;
  59}
  60
  61static void qemu_s390_tod_init(Object *obj)
  62{
  63    S390TODState *td = S390_TOD(obj);
  64    struct tm tm;
  65
  66    qemu_get_timedate(&tm, 0);
  67    td->base.high = 0;
  68    td->base.low = TOD_UNIX_EPOCH + (time2tod(mktimegm(&tm)) * 1000000000ULL);
  69    if (td->base.low < TOD_UNIX_EPOCH) {
  70        td->base.high += 1;
  71    }
  72}
  73
  74static TypeInfo qemu_s390_tod_info = {
  75    .name = TYPE_QEMU_S390_TOD,
  76    .parent = TYPE_S390_TOD,
  77    .instance_size = sizeof(S390TODState),
  78    .instance_init = qemu_s390_tod_init,
  79    .class_init = qemu_s390_tod_class_init,
  80    .class_size = sizeof(S390TODClass),
  81};
  82
  83static void register_types(void)
  84{
  85    type_register_static(&qemu_s390_tod_info);
  86}
  87type_init(register_types);
  88