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 16 void rng_backend_request_entropy(RngBackend *s, size_t size, 17 EntropyReceiveFunc *receive_entropy, 18 void *opaque) 19 { 20 RngBackendClass *k = RNG_BACKEND_GET_CLASS(s); 21 22 if (k->request_entropy) { 23 k->request_entropy(s, size, receive_entropy, opaque); 24 } 25 } 26 27 void rng_backend_cancel_requests(RngBackend *s) 28 { 29 RngBackendClass *k = RNG_BACKEND_GET_CLASS(s); 30 31 if (k->cancel_requests) { 32 k->cancel_requests(s); 33 } 34 } 35 36 static bool rng_backend_prop_get_opened(Object *obj, Error **errp) 37 { 38 RngBackend *s = RNG_BACKEND(obj); 39 40 return s->opened; 41 } 42 43 void rng_backend_open(RngBackend *s, Error **errp) 44 { 45 object_property_set_bool(OBJECT(s), true, "opened", errp); 46 } 47 48 static void rng_backend_prop_set_opened(Object *obj, bool value, Error **errp) 49 { 50 RngBackend *s = RNG_BACKEND(obj); 51 RngBackendClass *k = RNG_BACKEND_GET_CLASS(s); 52 53 if (value == s->opened) { 54 return; 55 } 56 57 if (!value && s->opened) { 58 error_set(errp, QERR_PERMISSION_DENIED); 59 return; 60 } 61 62 if (k->opened) { 63 k->opened(s, errp); 64 } 65 66 if (!error_is_set(errp)) { 67 s->opened = value; 68 } 69 } 70 71 static void rng_backend_init(Object *obj) 72 { 73 object_property_add_bool(obj, "opened", 74 rng_backend_prop_get_opened, 75 rng_backend_prop_set_opened, 76 NULL); 77 } 78 79 static const TypeInfo rng_backend_info = { 80 .name = TYPE_RNG_BACKEND, 81 .parent = TYPE_OBJECT, 82 .instance_size = sizeof(RngBackend), 83 .instance_init = rng_backend_init, 84 .class_size = sizeof(RngBackendClass), 85 .abstract = true, 86 }; 87 88 static void register_types(void) 89 { 90 type_register_static(&rng_backend_info); 91 } 92 93 type_init(register_types); 94