LXR qemu/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#include "sysemu/replay.h"
  14
  15OBJECT_DECLARE_SIMPLE_TYPE(RngBuiltin, RNG_BUILTIN)
  16
  17struct RngBuiltin {
  18    RngBackend parent;
  19    QEMUBH *bh;
  20};
  21
  22static 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
  37static void rng_builtin_request_entropy(RngBackend *b, RngRequest *req)
  38{
  39    RngBuiltin *s = RNG_BUILTIN(b);
  40
  41    replay_bh_schedule_event(s->bh);
  42}
  43
  44static 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
  51static void rng_builtin_finalize(Object *obj)
  52{
  53    RngBuiltin *s = RNG_BUILTIN(obj);
  54
  55    qemu_bh_delete(s->bh);
  56}
  57
  58static 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
  65static 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
  74static void register_types(void)
  75{
  76    type_register_static(&rng_builtin_info);
  77}
  78
  79type_init(register_types);
  80