| 1 | #ifndef FIO_LFSR_H |
| 2 | #define FIO_LFSR_H |
| 3 | |
| 4 | #include <inttypes.h> |
| 5 | |
| 6 | #define FIO_MAX_TAPS 6 |
| 7 | |
| 8 | struct lfsr_taps { |
| 9 | unsigned int length; |
| 10 | unsigned int taps[FIO_MAX_TAPS]; |
| 11 | }; |
| 12 | |
| 13 | |
| 14 | struct fio_lfsr { |
| 15 | uint64_t xormask; |
| 16 | uint64_t last_val; |
| 17 | uint64_t cached_bit; |
| 18 | uint64_t max_val; |
| 19 | uint64_t num_vals; |
| 20 | uint64_t cycle_length; |
| 21 | uint64_t cached_cycle_length; |
| 22 | unsigned int spin; |
| 23 | }; |
| 24 | |
| 25 | int lfsr_next(struct fio_lfsr *fl, uint64_t *off); |
| 26 | int lfsr_init(struct fio_lfsr *fl, uint64_t size, |
| 27 | uint64_t seed, unsigned int spin); |
| 28 | int lfsr_reset(struct fio_lfsr *fl, uint64_t seed); |
| 29 | |
| 30 | #endif |