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Linux ip-172-31-46-210 5.15.0-1033-aws #37~20.04.1-Ubuntu SMP Fri Mar 17 11:39:30 UTC 2023 x86_64
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hw_random.h
/* Hardware Random Number Generator Please read Documentation/admin-guide/hw_random.rst for details on use. ---------------------------------------------------------- This software may be used and distributed according to the terms of the GNU General Public License, incorporated herein by reference. */ #ifndef LINUX_HWRANDOM_H_ #define LINUX_HWRANDOM_H_ #include <linux/completion.h> #include <linux/types.h> #include <linux/list.h> #include <linux/kref.h> /** * struct hwrng - Hardware Random Number Generator driver * @name: Unique RNG name. * @init: Initialization callback (can be NULL). * @cleanup: Cleanup callback (can be NULL). * @data_present: Callback to determine if data is available * on the RNG. If NULL, it is assumed that * there is always data available. *OBSOLETE* * @data_read: Read data from the RNG device. * Returns the number of lower random bytes in "data". * Must not be NULL. *OBSOLETE* * @read: New API. drivers can fill up to max bytes of data * into the buffer. The buffer is aligned for any type * and max is a multiple of 4 and >= 32 bytes. * @priv: Private data, for use by the RNG driver. * @quality: Estimation of true entropy in RNG's bitstream * (in bits of entropy per 1024 bits of input; * valid values: 1 to 1024, or 0 for unknown). */ struct hwrng { const char *name; int (*init)(struct hwrng *rng); void (*cleanup)(struct hwrng *rng); int (*data_present)(struct hwrng *rng, int wait); int (*data_read)(struct hwrng *rng, u32 *data); int (*read)(struct hwrng *rng, void *data, size_t max, bool wait); unsigned long priv; unsigned short quality; /* internal. */ struct list_head list; struct kref ref; struct completion cleanup_done; }; struct device; /** Register a new Hardware Random Number Generator driver. */ extern int hwrng_register(struct hwrng *rng); extern int devm_hwrng_register(struct device *dev, struct hwrng *rng); /** Unregister a Hardware Random Number Generator driver. */ extern void hwrng_unregister(struct hwrng *rng); extern void devm_hwrng_unregister(struct device *dve, struct hwrng *rng); #endif /* LINUX_HWRANDOM_H_ */