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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051/* SPDX-License-Identifier: GPL-2.0 *//* * include/linux/prandom.h * * Include file for the fast pseudo-random 32-bit * generation. */#ifndef _LINUX_PRANDOM_H#define _LINUX_PRANDOM_H
#include <linux/types.h>#include <linux/once.h>#include <linux/percpu.h>#include <linux/random.h>
struct rnd_state { __u32 s1, s2, s3, s4;};
u32 prandom_u32_state(struct rnd_state *state);void prandom_bytes_state(struct rnd_state *state, void *buf, size_t nbytes);void prandom_seed_full_state(struct rnd_state __percpu *pcpu_state);
#define prandom_init_once(pcpu_state) \ DO_ONCE(prandom_seed_full_state, (pcpu_state))
/* * Handle minimum values for seeds */static inline u32 __seed(u32 x, u32 m){ return (x < m) ? x + m : x;}
/** * prandom_seed_state - set seed for prandom_u32_state(). * @state: pointer to state structure to receive the seed. * @seed: arbitrary 64-bit value to use as a seed. */static inline void prandom_seed_state(struct rnd_state *state, u64 seed){ u32 i = ((seed >> 32) ^ (seed << 10) ^ seed) & 0xffffffffUL;
state->s1 = __seed(i, 2U); state->s2 = __seed(i, 8U); state->s3 = __seed(i, 16U); state->s4 = __seed(i, 128U);}
#endif