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/*
* TOD (Time Of Day) clock - QEMU implementation
*
* Copyright 2018 Red Hat, Inc.
* Author(s): David Hildenbrand <david@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "hw/s390x/tod.h"
#include "qemu/timer.h"
#include "qemu/cutils.h"
#include "qemu/module.h"
#include "cpu.h"
#include "tcg_s390x.h"
static void qemu_s390_tod_get(const S390TODState *td, S390TOD *tod,
Error **errp)
{
*tod = td->base;
tod->low += time2tod(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
if (tod->low < td->base.low) {
tod->high++;
}
}
static void qemu_s390_tod_set(S390TODState *td, const S390TOD *tod,
Error **errp)
{
CPUState *cpu;
td->base = *tod;
td->base.low -= time2tod(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
if (td->base.low > tod->low) {
td->base.high--;
}
/*
* The TOD has been changed and we have to recalculate the CKC values
* for all CPUs. We do this asynchronously, as "SET CLOCK should be
* issued only while all other activity on all CPUs .. has been
* suspended".
*/
CPU_FOREACH(cpu) {
async_run_on_cpu(cpu, tcg_s390_tod_updated, RUN_ON_CPU_NULL);
}
}
static void qemu_s390_tod_class_init(ObjectClass *oc, void *data)
{
S390TODClass *tdc = S390_TOD_CLASS(oc);
tdc->get = qemu_s390_tod_get;
tdc->set = qemu_s390_tod_set;
}
static void qemu_s390_tod_init(Object *obj)
{
S390TODState *td = S390_TOD(obj);
struct tm tm;
qemu_get_timedate(&tm, 0);
td->base.high = 0;
td->base.low = TOD_UNIX_EPOCH + (time2tod(mktimegm(&tm)) * 1000000000ULL);
if (td->base.low < TOD_UNIX_EPOCH) {
td->base.high += 1;
}
}
static TypeInfo qemu_s390_tod_info = {
.name = TYPE_QEMU_S390_TOD,
.parent = TYPE_S390_TOD,
.instance_size = sizeof(S390TODState),
.instance_init = qemu_s390_tod_init,
.class_init = qemu_s390_tod_class_init,
.class_size = sizeof(S390TODClass),
};
static void register_types(void)
{
type_register_static(&qemu_s390_tod_info);
}
type_init(register_types);
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