LXR qemu/backends/rng.c

   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
  13#include "qemu/osdep.h"
  14#include "sysemu/rng.h"
  15#include "qapi/error.h"
  16#include "qapi/qmp/qerror.h"
  17#include "qemu/module.h"
  18#include "qom/object_interfaces.h"
  19
  20void rng_backend_request_entropy(RngBackend *s, size_t size,
  21                                 EntropyReceiveFunc *receive_entropy,
  22                                 void *opaque)
  23{
  24    RngBackendClass *k = RNG_BACKEND_GET_CLASS(s);
  25    RngRequest *req;
  26
  27    if (k->request_entropy) {
  28        req = g_malloc(sizeof(*req));
  29
  30        req->offset = 0;
  31        req->size = size;
  32        req->receive_entropy = receive_entropy;
  33        req->opaque = opaque;
  34        req->data = g_malloc(req->size);
  35
  36        k->request_entropy(s, req);
  37
  38        QSIMPLEQ_INSERT_TAIL(&s->requests, req, next);
  39    }
  40}
  41
  42static bool rng_backend_prop_get_opened(Object *obj, Error **errp)
  43{
  44    RngBackend *s = RNG_BACKEND(obj);
  45
  46    return s->opened;
  47}
  48
  49static void rng_backend_complete(UserCreatable *uc, Error **errp)
  50{
  51    RngBackend *s = RNG_BACKEND(uc);
  52    RngBackendClass *k = RNG_BACKEND_GET_CLASS(s);
  53    Error *local_err = NULL;
  54
  55    if (k->opened) {
  56        k->opened(s, &local_err);
  57        if (local_err) {
  58            error_propagate(errp, local_err);
  59            return;
  60        }
  61    }
  62
  63    s->opened = true;
  64}
  65
  66static void rng_backend_free_request(RngRequest *req)
  67{
  68    g_free(req->data);
  69    g_free(req);
  70}
  71
  72static void rng_backend_free_requests(RngBackend *s)
  73{
  74    RngRequest *req, *next;
  75
  76    QSIMPLEQ_FOREACH_SAFE(req, &s->requests, next, next) {
  77        rng_backend_free_request(req);
  78    }
  79
  80    QSIMPLEQ_INIT(&s->requests);
  81}
  82
  83void rng_backend_finalize_request(RngBackend *s, RngRequest *req)
  84{
  85    QSIMPLEQ_REMOVE(&s->requests, req, RngRequest, next);
  86    rng_backend_free_request(req);
  87}
  88
  89static void rng_backend_init(Object *obj)
  90{
  91    RngBackend *s = RNG_BACKEND(obj);
  92
  93    QSIMPLEQ_INIT(&s->requests);
  94}
  95
  96static void rng_backend_finalize(Object *obj)
  97{
  98    RngBackend *s = RNG_BACKEND(obj);
  99
 100    rng_backend_free_requests(s);
 101}
 102
 103static void rng_backend_class_init(ObjectClass *oc, void *data)
 104{
 105    UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
 106
 107    ucc->complete = rng_backend_complete;
 108
 109    object_class_property_add_bool(oc, "opened",
 110                                   rng_backend_prop_get_opened,
 111                                   NULL);
 112}
 113
 114static const TypeInfo rng_backend_info = {
 115    .name = TYPE_RNG_BACKEND,
 116    .parent = TYPE_OBJECT,
 117    .instance_size = sizeof(RngBackend),
 118    .instance_init = rng_backend_init,
 119    .instance_finalize = rng_backend_finalize,
 120    .class_size = sizeof(RngBackendClass),
 121    .class_init = rng_backend_class_init,
 122    .abstract = true,
 123    .interfaces = (InterfaceInfo[]) {
 124        { TYPE_USER_CREATABLE },
 125        { }
 126    }
 127};
 128
 129static void register_types(void)
 130{
 131    type_register_static(&rng_backend_info);
 132}
 133
 134type_init(register_types);
 135