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Commit | Line | Data |
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a9b7b2ad AL |
1 | /* |
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 | ||
9c058332 | 13 | #include "qemu/osdep.h" |
dccfcd0e | 14 | #include "sysemu/rng.h" |
da34e65c | 15 | #include "qapi/error.h" |
0b8fa32f | 16 | #include "qemu/module.h" |
269e09f3 | 17 | #include "qom/object_interfaces.h" |
a9b7b2ad AL |
18 | |
19 | void rng_backend_request_entropy(RngBackend *s, size_t size, | |
20 | EntropyReceiveFunc *receive_entropy, | |
21 | void *opaque) | |
22 | { | |
23 | RngBackendClass *k = RNG_BACKEND_GET_CLASS(s); | |
60253ed1 | 24 | RngRequest *req; |
a9b7b2ad AL |
25 | |
26 | if (k->request_entropy) { | |
60253ed1 LP |
27 | req = g_malloc(sizeof(*req)); |
28 | ||
29 | req->offset = 0; | |
30 | req->size = size; | |
31 | req->receive_entropy = receive_entropy; | |
32 | req->opaque = opaque; | |
33 | req->data = g_malloc(req->size); | |
34 | ||
35 | k->request_entropy(s, req); | |
36 | ||
443590c2 | 37 | QSIMPLEQ_INSERT_TAIL(&s->requests, req, next); |
a9b7b2ad AL |
38 | } |
39 | } | |
40 | ||
a9b7b2ad AL |
41 | static bool rng_backend_prop_get_opened(Object *obj, Error **errp) |
42 | { | |
43 | RngBackend *s = RNG_BACKEND(obj); | |
44 | ||
45 | return s->opened; | |
46 | } | |
47 | ||
57d3e1b3 | 48 | static void rng_backend_complete(UserCreatable *uc, Error **errp) |
a9b7b2ad | 49 | { |
6e577937 | 50 | RngBackend *s = RNG_BACKEND(uc); |
a9b7b2ad | 51 | RngBackendClass *k = RNG_BACKEND_GET_CLASS(s); |
65cd9064 | 52 | Error *local_err = NULL; |
a9b7b2ad | 53 | |
a9b7b2ad | 54 | if (k->opened) { |
65cd9064 MA |
55 | k->opened(s, &local_err); |
56 | if (local_err) { | |
57 | error_propagate(errp, local_err); | |
58 | return; | |
59 | } | |
a9b7b2ad AL |
60 | } |
61 | ||
65cd9064 | 62 | s->opened = true; |
a9b7b2ad AL |
63 | } |
64 | ||
9f14b0ad LP |
65 | static void rng_backend_free_request(RngRequest *req) |
66 | { | |
67 | g_free(req->data); | |
68 | g_free(req); | |
69 | } | |
70 | ||
71 | static void rng_backend_free_requests(RngBackend *s) | |
72 | { | |
443590c2 | 73 | RngRequest *req, *next; |
9f14b0ad | 74 | |
443590c2 LP |
75 | QSIMPLEQ_FOREACH_SAFE(req, &s->requests, next, next) { |
76 | rng_backend_free_request(req); | |
9f14b0ad LP |
77 | } |
78 | ||
443590c2 | 79 | QSIMPLEQ_INIT(&s->requests); |
9f14b0ad LP |
80 | } |
81 | ||
82 | void rng_backend_finalize_request(RngBackend *s, RngRequest *req) | |
83 | { | |
443590c2 | 84 | QSIMPLEQ_REMOVE(&s->requests, req, RngRequest, next); |
9f14b0ad LP |
85 | rng_backend_free_request(req); |
86 | } | |
87 | ||
a9b7b2ad AL |
88 | static void rng_backend_init(Object *obj) |
89 | { | |
443590c2 LP |
90 | RngBackend *s = RNG_BACKEND(obj); |
91 | ||
92 | QSIMPLEQ_INIT(&s->requests); | |
a9b7b2ad AL |
93 | } |
94 | ||
9f14b0ad LP |
95 | static void rng_backend_finalize(Object *obj) |
96 | { | |
97 | RngBackend *s = RNG_BACKEND(obj); | |
98 | ||
99 | rng_backend_free_requests(s); | |
100 | } | |
101 | ||
57d3e1b3 IM |
102 | static void rng_backend_class_init(ObjectClass *oc, void *data) |
103 | { | |
104 | UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); | |
105 | ||
106 | ucc->complete = rng_backend_complete; | |
29ee2a18 EH |
107 | |
108 | object_class_property_add_bool(oc, "opened", | |
109 | rng_backend_prop_get_opened, | |
6e577937 | 110 | NULL); |
57d3e1b3 IM |
111 | } |
112 | ||
8c43a6f0 | 113 | static const TypeInfo rng_backend_info = { |
a9b7b2ad AL |
114 | .name = TYPE_RNG_BACKEND, |
115 | .parent = TYPE_OBJECT, | |
116 | .instance_size = sizeof(RngBackend), | |
117 | .instance_init = rng_backend_init, | |
9f14b0ad | 118 | .instance_finalize = rng_backend_finalize, |
a9b7b2ad | 119 | .class_size = sizeof(RngBackendClass), |
57d3e1b3 | 120 | .class_init = rng_backend_class_init, |
a9b7b2ad | 121 | .abstract = true, |
269e09f3 IM |
122 | .interfaces = (InterfaceInfo[]) { |
123 | { TYPE_USER_CREATABLE }, | |
124 | { } | |
125 | } | |
a9b7b2ad AL |
126 | }; |
127 | ||
128 | static void register_types(void) | |
129 | { | |
130 | type_register_static(&rng_backend_info); | |
131 | } | |
132 | ||
133 | type_init(register_types); |