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0f734e6e76
This patch introduces a derating factor to struct hwrng for the random bits going into the kernel input pool, and a common default derating for drivers which do not specify one. Signed-off-by: Torsten Duwe <duwe@suse.de> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Acked-by: H. Peter Anvin <hpa@zytor.com>
57 lines
1.8 KiB
C
57 lines
1.8 KiB
C
/*
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Hardware Random Number Generator
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Please read Documentation/hw_random.txt for details on use.
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----------------------------------------------------------
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This software may be used and distributed according to the terms
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of the GNU General Public License, incorporated herein by reference.
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*/
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#ifndef LINUX_HWRANDOM_H_
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#define LINUX_HWRANDOM_H_
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#include <linux/types.h>
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#include <linux/list.h>
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/**
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* struct hwrng - Hardware Random Number Generator driver
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* @name: Unique RNG name.
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* @init: Initialization callback (can be NULL).
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* @cleanup: Cleanup callback (can be NULL).
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* @data_present: Callback to determine if data is available
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* on the RNG. If NULL, it is assumed that
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* there is always data available. *OBSOLETE*
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* @data_read: Read data from the RNG device.
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* Returns the number of lower random bytes in "data".
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* Must not be NULL. *OBSOLETE*
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* @read: New API. drivers can fill up to max bytes of data
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* into the buffer. The buffer is aligned for any type.
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* @priv: Private data, for use by the RNG driver.
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* @quality: Estimation of true entropy in RNG's bitstream
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* (per mill).
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*/
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struct hwrng {
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const char *name;
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int (*init)(struct hwrng *rng);
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void (*cleanup)(struct hwrng *rng);
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int (*data_present)(struct hwrng *rng, int wait);
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int (*data_read)(struct hwrng *rng, u32 *data);
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int (*read)(struct hwrng *rng, void *data, size_t max, bool wait);
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unsigned long priv;
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unsigned short quality;
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/* internal. */
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struct list_head list;
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};
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/** Register a new Hardware Random Number Generator driver. */
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extern int hwrng_register(struct hwrng *rng);
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/** Unregister a Hardware Random Number Generator driver. */
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extern void hwrng_unregister(struct hwrng *rng);
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/** Feed random bits into the pool. */
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extern void add_hwgenerator_randomness(const char *buffer, size_t count, size_t entropy);
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#endif /* LINUX_HWRANDOM_H_ */
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