2 * QEMU Random Number Generator Backend
4 * Copyright IBM, Corp. 2012
7 * Anthony Liguori <aliguori@us.ibm.com>
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.
16 #include "qom/object.h"
18 #define TYPE_RNG_BACKEND "rng-backend"
19 #define RNG_BACKEND(obj) \
20 OBJECT_CHECK(RngBackend, (obj), TYPE_RNG_BACKEND)
21 #define RNG_BACKEND_GET_CLASS(obj) \
22 OBJECT_GET_CLASS(RngBackendClass, (obj), TYPE_RNG_BACKEND)
23 #define RNG_BACKEND_CLASS(klass) \
24 OBJECT_CLASS_CHECK(RngBackendClass, (klass), TYPE_RNG_BACKEND)
26 typedef struct RngRequest RngRequest
;
27 typedef struct RngBackendClass RngBackendClass
;
28 typedef struct RngBackend RngBackend
;
30 typedef void (EntropyReceiveFunc
)(void *opaque
,
36 EntropyReceiveFunc
*receive_entropy
;
41 QSIMPLEQ_ENTRY(RngRequest
) next
;
44 struct RngBackendClass
46 ObjectClass parent_class
;
48 void (*request_entropy
)(RngBackend
*s
, RngRequest
*req
);
50 void (*opened
)(RngBackend
*s
, Error
**errp
);
59 QSIMPLEQ_HEAD(, RngRequest
) requests
;
64 * rng_backend_request_entropy:
65 * @s: the backend to request entropy from
66 * @size: the number of bytes of data to request
67 * @receive_entropy: a function to be invoked when entropy is available
68 * @opaque: data that should be passed to @receive_entropy
70 * This function is used by the front-end to request entropy from an entropy
71 * source. This function can be called multiple times before @receive_entropy
72 * is invoked with different values of @receive_entropy and @opaque. The
73 * backend will queue each request and handle appropriately.
75 * The backend does not need to pass the full amount of data to @receive_entropy
76 * but will pass a value greater than 0.
78 void rng_backend_request_entropy(RngBackend
*s
, size_t size
,
79 EntropyReceiveFunc
*receive_entropy
,
83 * rng_backend_free_request:
84 * @s: the backend that created the request
85 * @req: the request to finalize
87 * Used by child rng backend classes to finalize requests once they've been
88 * processed. The request is removed from the list of active requests and
91 void rng_backend_finalize_request(RngBackend
*s
, RngRequest
*req
);