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Anthony Liguoria9b7b2a2012-06-25 10:03:47 -05001/*
2 * QEMU Random Number Generator Backend
3 *
4 * Copyright IBM, Corp. 2012
5 *
6 * Authors:
7 * Anthony Liguori <aliguori@us.ibm.com>
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
Paolo Bonzinidccfcd02013-04-08 16:55:25 +020013#include "sysemu/rng.h"
Paolo Bonzini7b1b5d12012-12-17 18:19:43 +010014#include "qapi/qmp/qerror.h"
Igor Mammedov269e09f2014-01-16 17:34:38 +010015#include "qom/object_interfaces.h"
Anthony Liguoria9b7b2a2012-06-25 10:03:47 -050016
17void rng_backend_request_entropy(RngBackend *s, size_t size,
18 EntropyReceiveFunc *receive_entropy,
19 void *opaque)
20{
21 RngBackendClass *k = RNG_BACKEND_GET_CLASS(s);
22
23 if (k->request_entropy) {
24 k->request_entropy(s, size, receive_entropy, opaque);
25 }
26}
27
28void rng_backend_cancel_requests(RngBackend *s)
29{
30 RngBackendClass *k = RNG_BACKEND_GET_CLASS(s);
31
32 if (k->cancel_requests) {
33 k->cancel_requests(s);
34 }
35}
36
37static bool rng_backend_prop_get_opened(Object *obj, Error **errp)
38{
39 RngBackend *s = RNG_BACKEND(obj);
40
41 return s->opened;
42}
43
Igor Mammedov57d3e1b2014-01-16 17:34:39 +010044static void rng_backend_complete(UserCreatable *uc, Error **errp)
Anthony Liguoria9b7b2a2012-06-25 10:03:47 -050045{
Igor Mammedov57d3e1b2014-01-16 17:34:39 +010046 object_property_set_bool(OBJECT(uc), true, "opened", errp);
Anthony Liguoria9b7b2a2012-06-25 10:03:47 -050047}
48
49static void rng_backend_prop_set_opened(Object *obj, bool value, Error **errp)
50{
51 RngBackend *s = RNG_BACKEND(obj);
52 RngBackendClass *k = RNG_BACKEND_GET_CLASS(s);
Markus Armbruster65cd9062014-04-25 12:44:22 +020053 Error *local_err = NULL;
Anthony Liguoria9b7b2a2012-06-25 10:03:47 -050054
55 if (value == s->opened) {
56 return;
57 }
58
59 if (!value && s->opened) {
60 error_set(errp, QERR_PERMISSION_DENIED);
61 return;
62 }
63
64 if (k->opened) {
Markus Armbruster65cd9062014-04-25 12:44:22 +020065 k->opened(s, &local_err);
66 if (local_err) {
67 error_propagate(errp, local_err);
68 return;
69 }
Anthony Liguoria9b7b2a2012-06-25 10:03:47 -050070 }
71
Markus Armbruster65cd9062014-04-25 12:44:22 +020072 s->opened = true;
Anthony Liguoria9b7b2a2012-06-25 10:03:47 -050073}
74
75static void rng_backend_init(Object *obj)
76{
77 object_property_add_bool(obj, "opened",
78 rng_backend_prop_get_opened,
79 rng_backend_prop_set_opened,
80 NULL);
81}
82
Igor Mammedov57d3e1b2014-01-16 17:34:39 +010083static void rng_backend_class_init(ObjectClass *oc, void *data)
84{
85 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
86
87 ucc->complete = rng_backend_complete;
88}
89
Andreas Färber8c43a6f2013-01-10 16:19:07 +010090static const TypeInfo rng_backend_info = {
Anthony Liguoria9b7b2a2012-06-25 10:03:47 -050091 .name = TYPE_RNG_BACKEND,
92 .parent = TYPE_OBJECT,
93 .instance_size = sizeof(RngBackend),
94 .instance_init = rng_backend_init,
95 .class_size = sizeof(RngBackendClass),
Igor Mammedov57d3e1b2014-01-16 17:34:39 +010096 .class_init = rng_backend_class_init,
Anthony Liguoria9b7b2a2012-06-25 10:03:47 -050097 .abstract = true,
Igor Mammedov269e09f2014-01-16 17:34:38 +010098 .interfaces = (InterfaceInfo[]) {
99 { TYPE_USER_CREATABLE },
100 { }
101 }
Anthony Liguoria9b7b2a2012-06-25 10:03:47 -0500102};
103
104static void register_types(void)
105{
106 type_register_static(&rng_backend_info);
107}
108
109type_init(register_types);