Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * include/linux/random.h | |
3 | * | |
4 | * Include file for the random number generator. | |
5 | */ | |
1da177e4 LT |
6 | #ifndef _LINUX_RANDOM_H |
7 | #define _LINUX_RANDOM_H | |
8 | ||
607ca46e | 9 | #include <uapi/linux/random.h> |
1da177e4 | 10 | |
1da177e4 | 11 | |
a2080a67 | 12 | extern void add_device_randomness(const void *, unsigned int); |
1da177e4 LT |
13 | extern void add_input_randomness(unsigned int type, unsigned int code, |
14 | unsigned int value); | |
775f4b29 | 15 | extern void add_interrupt_randomness(int irq, int irq_flags); |
1da177e4 LT |
16 | |
17 | extern void get_random_bytes(void *buf, int nbytes); | |
c2557a30 | 18 | extern void get_random_bytes_arch(void *buf, int nbytes); |
1da177e4 LT |
19 | void generate_random_uuid(unsigned char uuid_out[16]); |
20 | ||
1da177e4 | 21 | #ifndef MODULE |
54047320 | 22 | extern const struct file_operations random_fops, urandom_fops; |
1da177e4 LT |
23 | #endif |
24 | ||
25 | unsigned int get_random_int(void); | |
26 | unsigned long randomize_range(unsigned long start, unsigned long end, unsigned long len); | |
27 | ||
aaa248f6 SH |
28 | u32 random32(void); |
29 | void srandom32(u32 seed); | |
30 | ||
5960164f JE |
31 | u32 prandom32(struct rnd_state *); |
32 | ||
33 | /* | |
34 | * Handle minimum values for seeds | |
35 | */ | |
36 | static inline u32 __seed(u32 x, u32 m) | |
37 | { | |
38 | return (x < m) ? x + m : x; | |
39 | } | |
40 | ||
41 | /** | |
42 | * prandom32_seed - set seed for prandom32(). | |
43 | * @state: pointer to state structure to receive the seed. | |
44 | * @seed: arbitrary 64-bit value to use as a seed. | |
45 | */ | |
46 | static inline void prandom32_seed(struct rnd_state *state, u64 seed) | |
47 | { | |
48 | u32 i = (seed >> 32) ^ (seed << 10) ^ seed; | |
49 | ||
50 | state->s1 = __seed(i, 1); | |
51 | state->s2 = __seed(i, 7); | |
52 | state->s3 = __seed(i, 15); | |
53 | } | |
54 | ||
63d77173 PA |
55 | #ifdef CONFIG_ARCH_RANDOM |
56 | # include <asm/archrandom.h> | |
57 | #else | |
58 | static inline int arch_get_random_long(unsigned long *v) | |
59 | { | |
60 | return 0; | |
61 | } | |
62 | static inline int arch_get_random_int(unsigned int *v) | |
63 | { | |
64 | return 0; | |
65 | } | |
66 | #endif | |
67 | ||
1da177e4 | 68 | #endif /* _LINUX_RANDOM_H */ |