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 54 if (value == s->opened) { 55 return; 56 } 57 58 if (!value && s->opened) { 59 error_set(errp, QERR_PERMISSION_DENIED); 60 return; 61 } 62 63 if (k->opened) { 64 k->opened(s, errp); 65 } 66 67 if (!error_is_set(errp)) { 68 s->opened = value; 69 } 70 } 71 72 static void rng_backend_init(Object *obj) 73 { 74 object_property_add_bool(obj, "opened", 75 rng_backend_prop_get_opened, 76 rng_backend_prop_set_opened, 77 NULL); 78 } 79 80 static void rng_backend_class_init(ObjectClass *oc, void *data) 81 { 82 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); 83 84 ucc->complete = rng_backend_complete; 85 } 86 87 static const TypeInfo rng_backend_info = { 88 .name = TYPE_RNG_BACKEND, 89 .parent = TYPE_OBJECT, 90 .instance_size = sizeof(RngBackend), 91 .instance_init = rng_backend_init, 92 .class_size = sizeof(RngBackendClass), 93 .class_init = rng_backend_class_init, 94 .abstract = true, 95 .interfaces = (InterfaceInfo[]) { 96 { TYPE_USER_CREATABLE }, 97 { } 98 } 99 }; 100 101 static void register_types(void) 102 { 103 type_register_static(&rng_backend_info); 104 } 105 106 type_init(register_types); 107