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 "sysemu/rng.h" 14 #include "qapi/qmp/qerror.h" 15 #include "qom/object_interfaces.h" 16 17 void rng_backend_request_entropy(RngBackend *s, size_t size, 18 EntropyReceiveFunc *receive_entropy, 19 void *opaque) 20 { 21 RngBackendClass *k = RNG_BACKEND_GET_CLASS(s); 22 23 if (k->request_entropy) { 24 k->request_entropy(s, size, receive_entropy, opaque); 25 } 26 } 27 28 void rng_backend_cancel_requests(RngBackend *s) 29 { 30 RngBackendClass *k = RNG_BACKEND_GET_CLASS(s); 31 32 if (k->cancel_requests) { 33 k->cancel_requests(s); 34 } 35 } 36 37 static bool rng_backend_prop_get_opened(Object *obj, Error **errp) 38 { 39 RngBackend *s = RNG_BACKEND(obj); 40 41 return s->opened; 42 } 43 44 static void rng_backend_complete(UserCreatable *uc, Error **errp) 45 { 46 object_property_set_bool(OBJECT(uc), true, "opened", errp); 47 } 48 49 static void rng_backend_prop_set_opened(Object *obj, bool value, Error **errp) 50 { 51 RngBackend *s = RNG_BACKEND(obj); 52 RngBackendClass *k = RNG_BACKEND_GET_CLASS(s); 53 Error *local_err = NULL; 54 55 if (value == s->opened) { 56 return; 57 } 58 59 if (!value && s->opened) { 60 error_set(errp, QERR_PERMISSION_DENIED); 61 return; 62 } 63 64 if (k->opened) { 65 k->opened(s, &local_err); 66 if (local_err) { 67 error_propagate(errp, local_err); 68 return; 69 } 70 } 71 72 s->opened = true; 73 } 74 75 static void rng_backend_init(Object *obj) 76 { 77 object_property_add_bool(obj, "opened", 78 rng_backend_prop_get_opened, 79 rng_backend_prop_set_opened, 80 NULL); 81 } 82 83 static void rng_backend_class_init(ObjectClass *oc, void *data) 84 { 85 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); 86 87 ucc->complete = rng_backend_complete; 88 } 89 90 static const TypeInfo rng_backend_info = { 91 .name = TYPE_RNG_BACKEND, 92 .parent = TYPE_OBJECT, 93 .instance_size = sizeof(RngBackend), 94 .instance_init = rng_backend_init, 95 .class_size = sizeof(RngBackendClass), 96 .class_init = rng_backend_class_init, 97 .abstract = true, 98 .interfaces = (InterfaceInfo[]) { 99 { TYPE_USER_CREATABLE }, 100 { } 101 } 102 }; 103 104 static void register_types(void) 105 { 106 type_register_static(&rng_backend_info); 107 } 108 109 type_init(register_types); 110