78 lines
1.8 KiB
C
78 lines
1.8 KiB
C
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/*
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* QEMU Builtin Random Number Generator Backend
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "sysemu/rng.h"
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#include "qemu/main-loop.h"
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#include "qemu/guest-random.h"
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#define RNG_BUILTIN(obj) OBJECT_CHECK(RngBuiltin, (obj), TYPE_RNG_BUILTIN)
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typedef struct RngBuiltin {
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RngBackend parent;
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QEMUBH *bh;
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} RngBuiltin;
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static void rng_builtin_receive_entropy_bh(void *opaque)
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{
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RngBuiltin *s = opaque;
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while (!QSIMPLEQ_EMPTY(&s->parent.requests)) {
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RngRequest *req = QSIMPLEQ_FIRST(&s->parent.requests);
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qemu_guest_getrandom_nofail(req->data, req->size);
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req->receive_entropy(req->opaque, req->data, req->size);
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rng_backend_finalize_request(&s->parent, req);
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}
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}
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static void rng_builtin_request_entropy(RngBackend *b, RngRequest *req)
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{
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RngBuiltin *s = RNG_BUILTIN(b);
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qemu_bh_schedule(s->bh);
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}
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static void rng_builtin_init(Object *obj)
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{
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RngBuiltin *s = RNG_BUILTIN(obj);
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s->bh = qemu_bh_new(rng_builtin_receive_entropy_bh, s);
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}
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static void rng_builtin_finalize(Object *obj)
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{
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RngBuiltin *s = RNG_BUILTIN(obj);
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qemu_bh_delete(s->bh);
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}
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static void rng_builtin_class_init(ObjectClass *klass, void *data)
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{
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RngBackendClass *rbc = RNG_BACKEND_CLASS(klass);
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rbc->request_entropy = rng_builtin_request_entropy;
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}
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static const TypeInfo rng_builtin_info = {
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.name = TYPE_RNG_BUILTIN,
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.parent = TYPE_RNG_BACKEND,
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.instance_size = sizeof(RngBuiltin),
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.instance_init = rng_builtin_init,
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.instance_finalize = rng_builtin_finalize,
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.class_init = rng_builtin_class_init,
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};
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static void register_types(void)
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{
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type_register_static(&rng_builtin_info);
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}
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type_init(register_types);
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