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6c4e9d48 LV |
1 | /* |
2 | * QEMU Builtin Random Number Generator Backend | |
3 | * | |
4 | * This work is licensed under the terms of the GNU GPL, version 2 or later. | |
5 | * See the COPYING file in the top-level directory. | |
6 | */ | |
7 | ||
8 | #include "qemu/osdep.h" | |
9 | #include "sysemu/rng.h" | |
10 | #include "qemu/main-loop.h" | |
11 | #include "qemu/guest-random.h" | |
db1015e9 | 12 | #include "qom/object.h" |
54550d88 | 13 | #include "sysemu/replay.h" |
6c4e9d48 | 14 | |
8063396b | 15 | OBJECT_DECLARE_SIMPLE_TYPE(RngBuiltin, RNG_BUILTIN) |
6c4e9d48 | 16 | |
db1015e9 | 17 | struct RngBuiltin { |
6c4e9d48 LV |
18 | RngBackend parent; |
19 | QEMUBH *bh; | |
db1015e9 | 20 | }; |
6c4e9d48 LV |
21 | |
22 | static void rng_builtin_receive_entropy_bh(void *opaque) | |
23 | { | |
24 | RngBuiltin *s = opaque; | |
25 | ||
26 | while (!QSIMPLEQ_EMPTY(&s->parent.requests)) { | |
27 | RngRequest *req = QSIMPLEQ_FIRST(&s->parent.requests); | |
28 | ||
29 | qemu_guest_getrandom_nofail(req->data, req->size); | |
30 | ||
31 | req->receive_entropy(req->opaque, req->data, req->size); | |
32 | ||
33 | rng_backend_finalize_request(&s->parent, req); | |
34 | } | |
35 | } | |
36 | ||
37 | static void rng_builtin_request_entropy(RngBackend *b, RngRequest *req) | |
38 | { | |
39 | RngBuiltin *s = RNG_BUILTIN(b); | |
40 | ||
54550d88 | 41 | replay_bh_schedule_event(s->bh); |
6c4e9d48 LV |
42 | } |
43 | ||
44 | static void rng_builtin_init(Object *obj) | |
45 | { | |
46 | RngBuiltin *s = RNG_BUILTIN(obj); | |
47 | ||
48 | s->bh = qemu_bh_new(rng_builtin_receive_entropy_bh, s); | |
49 | } | |
50 | ||
51 | static void rng_builtin_finalize(Object *obj) | |
52 | { | |
53 | RngBuiltin *s = RNG_BUILTIN(obj); | |
54 | ||
55 | qemu_bh_delete(s->bh); | |
56 | } | |
57 | ||
58 | static void rng_builtin_class_init(ObjectClass *klass, void *data) | |
59 | { | |
60 | RngBackendClass *rbc = RNG_BACKEND_CLASS(klass); | |
61 | ||
62 | rbc->request_entropy = rng_builtin_request_entropy; | |
63 | } | |
64 | ||
65 | static const TypeInfo rng_builtin_info = { | |
66 | .name = TYPE_RNG_BUILTIN, | |
67 | .parent = TYPE_RNG_BACKEND, | |
68 | .instance_size = sizeof(RngBuiltin), | |
69 | .instance_init = rng_builtin_init, | |
70 | .instance_finalize = rng_builtin_finalize, | |
71 | .class_init = rng_builtin_class_init, | |
72 | }; | |
73 | ||
74 | static void register_types(void) | |
75 | { | |
76 | type_register_static(&rng_builtin_info); | |
77 | } | |
78 | ||
79 | type_init(register_types); |