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1 /*
2  * TOD (Time Of Day) clock - QEMU implementation
3  *
4  * Copyright 2018 Red Hat, Inc.
5  * Author(s): David Hildenbrand <[email protected]>
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
19 static 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
30 static 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
53 static 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
61 static 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
74 static 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
83 static void register_types(void)
84 {
85     type_register_static(&qemu_s390_tod_info);
86 }
87 type_init(register_types);
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