94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
/*
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* QEMU Random Number Generator Backend
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*
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* Copyright IBM, Corp. 2012
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#ifndef QEMU_RNG_H
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#define QEMU_RNG_H
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#include "qom/object.h"
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#include "qemu-common.h"
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#define TYPE_RNG_BACKEND "rng-backend"
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#define RNG_BACKEND(obj) \
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OBJECT_CHECK(RngBackend, (obj), TYPE_RNG_BACKEND)
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#define RNG_BACKEND_GET_CLASS(obj) \
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OBJECT_GET_CLASS(RngBackendClass, (obj), TYPE_RNG_BACKEND)
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#define RNG_BACKEND_CLASS(klass) \
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OBJECT_CLASS_CHECK(RngBackendClass, (klass), TYPE_RNG_BACKEND)
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typedef struct RngRequest RngRequest;
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typedef struct RngBackendClass RngBackendClass;
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typedef struct RngBackend RngBackend;
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typedef void (EntropyReceiveFunc)(void *opaque,
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const void *data,
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size_t size);
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struct RngRequest
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{
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EntropyReceiveFunc *receive_entropy;
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uint8_t *data;
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void *opaque;
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size_t offset;
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size_t size;
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QSIMPLEQ_ENTRY(RngRequest) next;
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};
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struct RngBackendClass
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{
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ObjectClass parent_class;
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void (*request_entropy)(RngBackend *s, RngRequest *req);
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void (*opened)(RngBackend *s, Error **errp);
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};
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struct RngBackend
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{
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Object parent;
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/*< protected >*/
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bool opened;
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QSIMPLEQ_HEAD(requests, RngRequest) requests;
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};
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/**
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* rng_backend_request_entropy:
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* @s: the backend to request entropy from
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* @size: the number of bytes of data to request
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* @receive_entropy: a function to be invoked when entropy is available
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* @opaque: data that should be passed to @receive_entropy
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*
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* This function is used by the front-end to request entropy from an entropy
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* source. This function can be called multiple times before @receive_entropy
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* is invoked with different values of @receive_entropy and @opaque. The
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* backend will queue each request and handle appropriately.
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*
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* The backend does not need to pass the full amount of data to @receive_entropy
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* but will pass a value greater than 0.
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*/
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void rng_backend_request_entropy(RngBackend *s, size_t size,
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EntropyReceiveFunc *receive_entropy,
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void *opaque);
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/**
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* rng_backend_free_request:
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* @s: the backend that created the request
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* @req: the request to finalize
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*
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* Used by child rng backend classes to finalize requests once they've been
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* processed. The request is removed from the list of active requests and
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* deleted.
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*/
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void rng_backend_finalize_request(RngBackend *s, RngRequest *req);
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#endif
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