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/qmp/qerror.h" 16 #include "qom/object_interfaces.h" 17 18 void rng_backend_request_entropy(RngBackend *s, size_t size, 19 EntropyReceiveFunc *receive_entropy, 20 void *opaque) 21 { 22 RngBackendClass *k = RNG_BACKEND_GET_CLASS(s); 23 24 if (k->request_entropy) { 25 k->request_entropy(s, size, receive_entropy, opaque); 26 } 27 } 28 29 void rng_backend_cancel_requests(RngBackend *s) 30 { 31 RngBackendClass *k = RNG_BACKEND_GET_CLASS(s); 32 33 if (k->cancel_requests) { 34 k->cancel_requests(s); 35 } 36 } 37 38 static bool rng_backend_prop_get_opened(Object *obj, Error **errp) 39 { 40 RngBackend *s = RNG_BACKEND(obj); 41 42 return s->opened; 43 } 44 45 static void rng_backend_complete(UserCreatable *uc, Error **errp) 46 { 47 object_property_set_bool(OBJECT(uc), true, "opened", errp); 48 } 49 50 static void rng_backend_prop_set_opened(Object *obj, bool value, Error **errp) 51 { 52 RngBackend *s = RNG_BACKEND(obj); 53 RngBackendClass *k = RNG_BACKEND_GET_CLASS(s); 54 Error *local_err = NULL; 55 56 if (value == s->opened) { 57 return; 58 } 59 60 if (!value && s->opened) { 61 error_setg(errp, QERR_PERMISSION_DENIED); 62 return; 63 } 64 65 if (k->opened) { 66 k->opened(s, &local_err); 67 if (local_err) { 68 error_propagate(errp, local_err); 69 return; 70 } 71 } 72 73 s->opened = true; 74 } 75 76 static void rng_backend_init(Object *obj) 77 { 78 object_property_add_bool(obj, "opened", 79 rng_backend_prop_get_opened, 80 rng_backend_prop_set_opened, 81 NULL); 82 } 83 84 static void rng_backend_class_init(ObjectClass *oc, void *data) 85 { 86 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); 87 88 ucc->complete = rng_backend_complete; 89 } 90 91 static const TypeInfo rng_backend_info = { 92 .name = TYPE_RNG_BACKEND, 93 .parent = TYPE_OBJECT, 94 .instance_size = sizeof(RngBackend), 95 .instance_init = rng_backend_init, 96 .class_size = sizeof(RngBackendClass), 97 .class_init = rng_backend_class_init, 98 .abstract = true, 99 .interfaces = (InterfaceInfo[]) { 100 { TYPE_USER_CREATABLE }, 101 { } 102 } 103 }; 104 105 static void register_types(void) 106 { 107 type_register_static(&rng_backend_info); 108 } 109 110 type_init(register_types); 111