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" |
Anthony Liguori | a9b7b2a | 2012-06-25 10:03:47 -0500 | [diff] [blame] | 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 | |
Andreas Färber | 8c43a6f | 2013-01-10 16:19:07 +0100 | [diff] [blame] | 79 | static const TypeInfo rng_backend_info = { |
Anthony Liguori | a9b7b2a | 2012-06-25 10:03:47 -0500 | [diff] [blame] | 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); |