6 #include "../arch/arch.h"
8 #define FRAND32_MAX (-1U)
9 #define FRAND64_MAX (-1ULL)
12 unsigned int s1, s2, s3;
15 struct taus258_state {
16 uint64_t s1, s2, s3, s4, s5;
22 struct taus88_state state32;
23 struct taus258_state state64;
27 struct frand64_state {
28 uint64_t s1, s2, s3, s4, s5;
31 static inline uint64_t rand_max(struct frand_state *state)
39 static inline void __frand32_copy(struct taus88_state *dst,
40 struct taus88_state *src)
47 static inline void __frand64_copy(struct taus258_state *dst,
48 struct taus258_state *src)
57 static inline void frand_copy(struct frand_state *dst, struct frand_state *src)
60 __frand64_copy(&dst->state64, &src->state64);
62 __frand32_copy(&dst->state32, &src->state32);
64 dst->use64 = src->use64;
67 static inline unsigned int __rand32(struct taus88_state *state)
69 #define TAUSWORTHE(s,a,b,c,d) ((s&c)<<d) ^ (((s <<a) ^ s)>>b)
71 state->s1 = TAUSWORTHE(state->s1, 13, 19, 4294967294UL, 12);
72 state->s2 = TAUSWORTHE(state->s2, 2, 25, 4294967288UL, 4);
73 state->s3 = TAUSWORTHE(state->s3, 3, 11, 4294967280UL, 17);
75 return (state->s1 ^ state->s2 ^ state->s3);
78 static inline uint64_t __rand64(struct taus258_state *state)
82 xval = ((state->s1 << 1) ^ state->s1) >> 53;
83 state->s1 = ((state->s1 & 18446744073709551614ULL) << 10) ^ xval;
85 xval = ((state->s2 << 24) ^ state->s2) >> 50;
86 state->s2 = ((state->s2 & 18446744073709551104ULL) << 5) ^ xval;
88 xval = ((state->s3 << 3) ^ state->s3) >> 23;
89 state->s3 = ((state->s3 & 18446744073709547520ULL) << 29) ^ xval;
91 xval = ((state->s4 << 5) ^ state->s4) >> 24;
92 state->s4 = ((state->s4 & 18446744073709420544ULL) << 23) ^ xval;
94 xval = ((state->s5 << 3) ^ state->s5) >> 33;
95 state->s5 = ((state->s5 & 18446744073701163008ULL) << 8) ^ xval;
97 return (state->s1 ^ state->s2 ^ state->s3 ^ state->s4 ^ state->s5);
100 static inline uint64_t __rand(struct frand_state *state)
103 return __rand64(&state->state64);
105 return __rand32(&state->state32);
108 static inline double __rand_0_1(struct frand_state *state)
111 uint64_t val = __rand64(&state->state64);
113 return (val + 1.0) / (FRAND64_MAX + 1.0);
115 uint32_t val = __rand32(&state->state32);
117 return (val + 1.0) / (FRAND32_MAX + 1.0);
122 * Generate a random value between 'start' and 'end', both inclusive
124 static inline int rand_between(struct frand_state *state, int start, int end)
129 return start + (int) ((double)end * (r / (rand_max(state) + 1.0)));
132 extern void init_rand(struct frand_state *, bool);
133 extern void init_rand_seed(struct frand_state *, unsigned int seed, bool);
134 extern void __fill_random_buf(void *buf, unsigned int len, unsigned long seed);
135 extern unsigned long fill_random_buf(struct frand_state *, void *buf, unsigned int len);
136 extern void __fill_random_buf_percentage(unsigned long, void *, unsigned int, unsigned int, unsigned int, char *, unsigned int);
137 extern unsigned long fill_random_buf_percentage(struct frand_state *, void *, unsigned int, unsigned int, unsigned int, char *, unsigned int);