From a9b7b2ad7b075dba5495271706670e5c6b1304bc Mon Sep 17 00:00:00 2001 From: Anthony Liguori Date: Mon, 25 Jun 2012 10:03:47 -0500 Subject: rng: add RndBackend abstract object class This is the backend used by devices that need to request entropy. Signed-off-by: Anthony Liguori --- backends/Makefile.objs | 1 + backends/rng.c | 93 ++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 94 insertions(+) create mode 100644 backends/Makefile.objs create mode 100644 backends/rng.c (limited to 'backends') diff --git a/backends/Makefile.objs b/backends/Makefile.objs new file mode 100644 index 0000000000..06e08c782d --- /dev/null +++ b/backends/Makefile.objs @@ -0,0 +1 @@ +common-obj-y += rng.o diff --git a/backends/rng.c b/backends/rng.c new file mode 100644 index 0000000000..06f261180c --- /dev/null +++ b/backends/rng.c @@ -0,0 +1,93 @@ +/* + * QEMU Random Number Generator Backend + * + * Copyright IBM, Corp. 2012 + * + * Authors: + * Anthony Liguori + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + */ + +#include "qemu/rng.h" +#include "qerror.h" + +void rng_backend_request_entropy(RngBackend *s, size_t size, + EntropyReceiveFunc *receive_entropy, + void *opaque) +{ + RngBackendClass *k = RNG_BACKEND_GET_CLASS(s); + + if (k->request_entropy) { + k->request_entropy(s, size, receive_entropy, opaque); + } +} + +void rng_backend_cancel_requests(RngBackend *s) +{ + RngBackendClass *k = RNG_BACKEND_GET_CLASS(s); + + if (k->cancel_requests) { + k->cancel_requests(s); + } +} + +static bool rng_backend_prop_get_opened(Object *obj, Error **errp) +{ + RngBackend *s = RNG_BACKEND(obj); + + return s->opened; +} + +void rng_backend_open(RngBackend *s, Error **errp) +{ + object_property_set_bool(OBJECT(s), true, "opened", errp); +} + +static void rng_backend_prop_set_opened(Object *obj, bool value, Error **errp) +{ + RngBackend *s = RNG_BACKEND(obj); + RngBackendClass *k = RNG_BACKEND_GET_CLASS(s); + + if (value == s->opened) { + return; + } + + if (!value && s->opened) { + error_set(errp, QERR_PERMISSION_DENIED); + return; + } + + if (k->opened) { + k->opened(s, errp); + } + + if (!error_is_set(errp)) { + s->opened = value; + } +} + +static void rng_backend_init(Object *obj) +{ + object_property_add_bool(obj, "opened", + rng_backend_prop_get_opened, + rng_backend_prop_set_opened, + NULL); +} + +static TypeInfo rng_backend_info = { + .name = TYPE_RNG_BACKEND, + .parent = TYPE_OBJECT, + .instance_size = sizeof(RngBackend), + .instance_init = rng_backend_init, + .class_size = sizeof(RngBackendClass), + .abstract = true, +}; + +static void register_types(void) +{ + type_register_static(&rng_backend_info); +} + +type_init(register_types); -- cgit v1.2.1