2 * Copyright (c) 2000-2013 Mark R. V. Murray
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer
10 * in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 #ifndef _SYS_RANDOM_H_
30 #define _SYS_RANDOM_H_
34 #include <sys/types.h>
38 u_int read_random(void *, u_int);
39 int read_random_uio(struct uio *, bool);
42 * Note: if you add or remove members of random_entropy_source, remember to also update the
43 * KASSERT regarding what valid members are in random_harvest_internal(), and remember the
44 * strings in the static array random_source_descr[] in random_harvestq.c.
46 * NOTE: complain loudly to markm@ or on the lists if this enum gets more than 32
47 * distinct values (0-31)! ENTROPYSOURCE may be == 32, but not > 32.
49 enum random_entropy_source {
52 /* Environmental sources */
62 RANDOM_FAST, /* Special!! Miscellaneous high performance stuff, like UMA/SLAB Allocator */
63 RANDOM_ENVIRONMENTAL_END = RANDOM_FAST,
64 /* Fast hardware random-number sources from here on. */
77 #define RANDOM_HARVEST_EVERYTHING_MASK ((1 << (RANDOM_ENVIRONMENTAL_END + 1)) - 1)
79 #if defined(RANDOM_DUMMY)
80 #define random_harvest_queue(a, b, c, d) do {} while (0)
81 #define random_harvest_fast(a, b, c, d) do {} while (0)
82 #define random_harvest_direct(a, b, c, d) do {} while (0)
83 #else /* !defined(RANDOM_DUMMY) */
84 void random_harvest_queue(const void *, u_int, u_int, enum random_entropy_source);
85 void random_harvest_fast(const void *, u_int, u_int, enum random_entropy_source);
86 void random_harvest_direct(const void *, u_int, u_int, enum random_entropy_source);
87 #endif /* defined(RANDOM_DUMMY) */
91 #endif /* _SYS_RANDOM_H_ */