Anthony Liguori | a9b7b2a | 2012-06-25 10:03:47 -0500 | [diff] [blame] | 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 | |
Paolo Bonzini | dccfcd0 | 2013-04-08 16:55:25 +0200 | [diff] [blame] | 13 | #include "sysemu/rng.h" |
Paolo Bonzini | 7b1b5d1 | 2012-12-17 18:19:43 +0100 | [diff] [blame] | 14 | #include "qapi/qmp/qerror.h" |
Igor Mammedov | 269e09f | 2014-01-16 17:34:38 +0100 | [diff] [blame] | 15 | #include "qom/object_interfaces.h" |
Anthony Liguori | a9b7b2a | 2012-06-25 10:03:47 -0500 | [diff] [blame] | 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 | |
Igor Mammedov | 57d3e1b | 2014-01-16 17:34:39 +0100 | [diff] [blame] | 44 | static void rng_backend_complete(UserCreatable *uc, Error **errp) |
Anthony Liguori | a9b7b2a | 2012-06-25 10:03:47 -0500 | [diff] [blame] | 45 | { |
Igor Mammedov | 57d3e1b | 2014-01-16 17:34:39 +0100 | [diff] [blame] | 46 | object_property_set_bool(OBJECT(uc), true, "opened", errp); |
Anthony Liguori | a9b7b2a | 2012-06-25 10:03:47 -0500 | [diff] [blame] | 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); |
Markus Armbruster | 65cd906 | 2014-04-25 12:44:22 +0200 | [diff] [blame] | 53 | Error *local_err = NULL; |
Anthony Liguori | a9b7b2a | 2012-06-25 10:03:47 -0500 | [diff] [blame] | 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) { |
Markus Armbruster | 65cd906 | 2014-04-25 12:44:22 +0200 | [diff] [blame] | 65 | k->opened(s, &local_err); |
| 66 | if (local_err) { |
| 67 | error_propagate(errp, local_err); |
| 68 | return; |
| 69 | } |
Anthony Liguori | a9b7b2a | 2012-06-25 10:03:47 -0500 | [diff] [blame] | 70 | } |
| 71 | |
Markus Armbruster | 65cd906 | 2014-04-25 12:44:22 +0200 | [diff] [blame] | 72 | s->opened = true; |
Anthony Liguori | a9b7b2a | 2012-06-25 10:03:47 -0500 | [diff] [blame] | 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 | |
Igor Mammedov | 57d3e1b | 2014-01-16 17:34:39 +0100 | [diff] [blame] | 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 | |
Andreas Färber | 8c43a6f | 2013-01-10 16:19:07 +0100 | [diff] [blame] | 90 | static const TypeInfo rng_backend_info = { |
Anthony Liguori | a9b7b2a | 2012-06-25 10:03:47 -0500 | [diff] [blame] | 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), |
Igor Mammedov | 57d3e1b | 2014-01-16 17:34:39 +0100 | [diff] [blame] | 96 | .class_init = rng_backend_class_init, |
Anthony Liguori | a9b7b2a | 2012-06-25 10:03:47 -0500 | [diff] [blame] | 97 | .abstract = true, |
Igor Mammedov | 269e09f | 2014-01-16 17:34:38 +0100 | [diff] [blame] | 98 | .interfaces = (InterfaceInfo[]) { |
| 99 | { TYPE_USER_CREATABLE }, |
| 100 | { } |
| 101 | } |
Anthony Liguori | a9b7b2a | 2012-06-25 10:03:47 -0500 | [diff] [blame] | 102 | }; |
| 103 | |
| 104 | static void register_types(void) |
| 105 | { |
| 106 | type_register_static(&rng_backend_info); |
| 107 | } |
| 108 | |
| 109 | type_init(register_types); |