1 files changed, 109 insertions, 0 deletions
diff --git a/qemu/backends/rng.c b/qemu/backends/rng.c
new file mode 100644
index 000000000..5065fdc15
--- /dev/null
+++ b/qemu/backends/rng.c
@@ -0,0 +1,109 @@
+/*
+ * QEMU Random Number Generator Backend
+ *
+ * Copyright IBM, Corp. 2012
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "sysemu/rng.h"
+#include "qapi/qmp/qerror.h"
+#include "qom/object_interfaces.h"
+
+void rng_backend_request_entropy(RngBackend *s, size_t size,
+                                 EntropyReceiveFunc *receive_entropy,
+                                 void *opaque)
+{
+    RngBackendClass *k = RNG_BACKEND_GET_CLASS(s);
+
+    if (k->request_entropy) {
+        k->request_entropy(s, size, receive_entropy, opaque);
+    }
+}
+
+void rng_backend_cancel_requests(RngBackend *s)
+{
+    RngBackendClass *k = RNG_BACKEND_GET_CLASS(s);
+
+    if (k->cancel_requests) {
+        k->cancel_requests(s);
+    }
+}
+
+static bool rng_backend_prop_get_opened(Object *obj, Error **errp)
+{
+    RngBackend *s = RNG_BACKEND(obj);
+
+    return s->opened;
+}
+
+static void rng_backend_complete(UserCreatable *uc, Error **errp)
+{
+    object_property_set_bool(OBJECT(uc), true, "opened", errp);
+}
+
+static void rng_backend_prop_set_opened(Object *obj, bool value, Error **errp)
+{
+    RngBackend *s = RNG_BACKEND(obj);
+    RngBackendClass *k = RNG_BACKEND_GET_CLASS(s);
+    Error *local_err = NULL;
+
+    if (value == s->opened) {
+        return;
+    }
+
+    if (!value && s->opened) {
+        error_setg(errp, QERR_PERMISSION_DENIED);
+        return;
+    }
+
+    if (k->opened) {
+        k->opened(s, &local_err);
+        if (local_err) {
+            error_propagate(errp, local_err);
+            return;
+        }
+    }
+
+    s->opened = true;
+}
+
+static void rng_backend_init(Object *obj)
+{
+    object_property_add_bool(obj, "opened",
+                             rng_backend_prop_get_opened,
+                             rng_backend_prop_set_opened,
+                             NULL);
+}
+
+static void rng_backend_class_init(ObjectClass *oc, void *data)
+{
+    UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
+
+    ucc->complete = rng_backend_complete;
+}
+
+static const TypeInfo rng_backend_info = {
+    .name = TYPE_RNG_BACKEND,
+    .parent = TYPE_OBJECT,
+    .instance_size = sizeof(RngBackend),
+    .instance_init = rng_backend_init,
+    .class_size = sizeof(RngBackendClass),
+    .class_init = rng_backend_class_init,
+    .abstract = true,
+    .interfaces = (InterfaceInfo[]) {
+        { TYPE_USER_CREATABLE },
+        { }
+    }
+};
+
+static void register_types(void)
+{
+    type_register_static(&rng_backend_info);
+}
+
+type_init(register_types);