1 /* 2 * include/linux/random.h 3 * 4 * Include file for the random number generator. 5 */ 6 #ifndef _LINUX_RANDOM_H 7 #define _LINUX_RANDOM_H 8 9 #include <uapi/linux/random.h> 10 11 12 extern void add_device_randomness(const void *, unsigned int); 13 extern void add_input_randomness(unsigned int type, unsigned int code, 14 unsigned int value); 15 extern void add_interrupt_randomness(int irq, int irq_flags); 16 17 extern void get_random_bytes(void *buf, int nbytes); 18 extern void get_random_bytes_arch(void *buf, int nbytes); 19 void generate_random_uuid(unsigned char uuid_out[16]); 20 21 #ifndef MODULE 22 extern const struct file_operations random_fops, urandom_fops; 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 28 u32 random32(void); 29 void srandom32(u32 seed); 30 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 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 68 #endif /* _LINUX_RANDOM_H */ 69