x86: acpi: introduce AcpiPmInfo::smi_on_cpuhp
[qemu.git] / backends / rng-builtin.c
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"
12 #include "qom/object.h"
13
14 OBJECT_DECLARE_SIMPLE_TYPE(RngBuiltin, RNG_BUILTIN)
15
16 struct RngBuiltin {
17 RngBackend parent;
18 QEMUBH *bh;
19 };
20
21 static void rng_builtin_receive_entropy_bh(void *opaque)
22 {
23 RngBuiltin *s = opaque;
24
25 while (!QSIMPLEQ_EMPTY(&s->parent.requests)) {
26 RngRequest *req = QSIMPLEQ_FIRST(&s->parent.requests);
27
28 qemu_guest_getrandom_nofail(req->data, req->size);
29
30 req->receive_entropy(req->opaque, req->data, req->size);
31
32 rng_backend_finalize_request(&s->parent, req);
33 }
34 }
35
36 static void rng_builtin_request_entropy(RngBackend *b, RngRequest *req)
37 {
38 RngBuiltin *s = RNG_BUILTIN(b);
39
40 qemu_bh_schedule(s->bh);
41 }
42
43 static void rng_builtin_init(Object *obj)
44 {
45 RngBuiltin *s = RNG_BUILTIN(obj);
46
47 s->bh = qemu_bh_new(rng_builtin_receive_entropy_bh, s);
48 }
49
50 static void rng_builtin_finalize(Object *obj)
51 {
52 RngBuiltin *s = RNG_BUILTIN(obj);
53
54 qemu_bh_delete(s->bh);
55 }
56
57 static void rng_builtin_class_init(ObjectClass *klass, void *data)
58 {
59 RngBackendClass *rbc = RNG_BACKEND_CLASS(klass);
60
61 rbc->request_entropy = rng_builtin_request_entropy;
62 }
63
64 static const TypeInfo rng_builtin_info = {
65 .name = TYPE_RNG_BUILTIN,
66 .parent = TYPE_RNG_BACKEND,
67 .instance_size = sizeof(RngBuiltin),
68 .instance_init = rng_builtin_init,
69 .instance_finalize = rng_builtin_finalize,
70 .class_init = rng_builtin_class_init,
71 };
72
73 static void register_types(void)
74 {
75 type_register_static(&rng_builtin_info);
76 }
77
78 type_init(register_types);