11fbbf72e16c27a6fda636db3891a41cd37dc6666Jens Axboe#ifndef FIO_RAND_H 21fbbf72e16c27a6fda636db3891a41cd37dc6666Jens Axboe#define FIO_RAND_H 31fbbf72e16c27a6fda636db3891a41cd37dc6666Jens Axboe 42615cc4b28e7d0e436a625dff92e6a71ccc6c49bJens Axboe#define FRAND_MAX (-1U) 52615cc4b28e7d0e436a625dff92e6a71ccc6c49bJens Axboe 61fbbf72e16c27a6fda636db3891a41cd37dc6666Jens Axboestruct frand_state { 71fbbf72e16c27a6fda636db3891a41cd37dc6666Jens Axboe unsigned int s1, s2, s3; 81fbbf72e16c27a6fda636db3891a41cd37dc6666Jens Axboe}; 91fbbf72e16c27a6fda636db3891a41cd37dc6666Jens Axboe 101fbbf72e16c27a6fda636db3891a41cd37dc6666Jens Axboestatic inline unsigned int __rand(struct frand_state *state) 111fbbf72e16c27a6fda636db3891a41cd37dc6666Jens Axboe{ 121fbbf72e16c27a6fda636db3891a41cd37dc6666Jens Axboe#define TAUSWORTHE(s,a,b,c,d) ((s&c)<<d) ^ (((s <<a) ^ s)>>b) 131fbbf72e16c27a6fda636db3891a41cd37dc6666Jens Axboe 141fbbf72e16c27a6fda636db3891a41cd37dc6666Jens Axboe state->s1 = TAUSWORTHE(state->s1, 13, 19, 4294967294UL, 12); 151fbbf72e16c27a6fda636db3891a41cd37dc6666Jens Axboe state->s2 = TAUSWORTHE(state->s2, 2, 25, 4294967288UL, 4); 161fbbf72e16c27a6fda636db3891a41cd37dc6666Jens Axboe state->s3 = TAUSWORTHE(state->s3, 3, 11, 4294967280UL, 17); 171fbbf72e16c27a6fda636db3891a41cd37dc6666Jens Axboe 181fbbf72e16c27a6fda636db3891a41cd37dc6666Jens Axboe return (state->s1 ^ state->s2 ^ state->s3); 191fbbf72e16c27a6fda636db3891a41cd37dc6666Jens Axboe} 201fbbf72e16c27a6fda636db3891a41cd37dc6666Jens Axboe 211fbbf72e16c27a6fda636db3891a41cd37dc6666Jens Axboeextern void init_rand(struct frand_state *); 222615cc4b28e7d0e436a625dff92e6a71ccc6c49bJens Axboeextern void init_rand_seed(struct frand_state *, unsigned int seed); 237d9fb455aadc0c0363489591775496f27f4a560aJens Axboeextern void __fill_random_buf(void *buf, unsigned int len, unsigned long seed); 243545a109a2cfe5ab22969ef453dc049db47f0b68Jens Axboeextern unsigned long fill_random_buf(struct frand_state *, void *buf, unsigned int len); 259c42684e32325da26e862280388798343c5f1305Jens Axboeextern unsigned long fill_random_buf_percentage(struct frand_state *, void *buf, unsigned int percentage, unsigned int segment, unsigned int len); 261fbbf72e16c27a6fda636db3891a41cd37dc6666Jens Axboe 271fbbf72e16c27a6fda636db3891a41cd37dc6666Jens Axboe#endif 28