7 #include "../arch/arch.h"
9 #define FRAND32_MAX (-1U)
10 #define FRAND64_MAX (-1ULL)
13 unsigned int s1, s2, s3;
16 struct taus258_state {
17 uint64_t s1, s2, s3, s4, s5;
23 struct taus88_state state32;
24 struct taus258_state state64;
28 static inline uint64_t rand_max(struct frand_state *state)
36 static inline void __frand32_copy(struct taus88_state *dst,
37 struct taus88_state *src)
44 static inline void __frand64_copy(struct taus258_state *dst,
45 struct taus258_state *src)
54 static inline void frand_copy(struct frand_state *dst, struct frand_state *src)
57 __frand64_copy(&dst->state64, &src->state64);
59 __frand32_copy(&dst->state32, &src->state32);
61 dst->use64 = src->use64;
64 static inline unsigned int __rand32(struct taus88_state *state)
66 #define TAUSWORTHE(s,a,b,c,d) ((s&c)<<d) ^ (((s <<a) ^ s)>>b)
68 state->s1 = TAUSWORTHE(state->s1, 13, 19, 4294967294UL, 12);
69 state->s2 = TAUSWORTHE(state->s2, 2, 25, 4294967288UL, 4);
70 state->s3 = TAUSWORTHE(state->s3, 3, 11, 4294967280UL, 17);
72 return (state->s1 ^ state->s2 ^ state->s3);
75 static inline uint64_t __rand64(struct taus258_state *state)
79 xval = ((state->s1 << 1) ^ state->s1) >> 53;
80 state->s1 = ((state->s1 & 18446744073709551614ULL) << 10) ^ xval;
82 xval = ((state->s2 << 24) ^ state->s2) >> 50;
83 state->s2 = ((state->s2 & 18446744073709551104ULL) << 5) ^ xval;
85 xval = ((state->s3 << 3) ^ state->s3) >> 23;
86 state->s3 = ((state->s3 & 18446744073709547520ULL) << 29) ^ xval;
88 xval = ((state->s4 << 5) ^ state->s4) >> 24;
89 state->s4 = ((state->s4 & 18446744073709420544ULL) << 23) ^ xval;
91 xval = ((state->s5 << 3) ^ state->s5) >> 33;
92 state->s5 = ((state->s5 & 18446744073701163008ULL) << 8) ^ xval;
94 return (state->s1 ^ state->s2 ^ state->s3 ^ state->s4 ^ state->s5);
97 static inline uint64_t __rand(struct frand_state *state)
100 return __rand64(&state->state64);
102 return __rand32(&state->state32);
105 static inline double __rand_0_1(struct frand_state *state)
108 uint64_t val = __rand64(&state->state64);
110 return (val + 1.0) / (FRAND64_MAX + 1.0);
112 uint32_t val = __rand32(&state->state32);
114 return (val + 1.0) / (FRAND32_MAX + 1.0);
119 * Generate a random value between 'start' and 'end', both inclusive
121 static inline int rand32_between(struct frand_state *state, int start, int end)
125 assert(!state->use64);
127 r = __rand32(&state->state32);
128 return start + (int) ((double)end * (r / (FRAND32_MAX + 1.0)));
131 extern void init_rand(struct frand_state *, bool);
132 extern void init_rand_seed(struct frand_state *, unsigned int seed, bool);
133 extern void __fill_random_buf(void *buf, unsigned int len, unsigned long seed);
134 extern unsigned long fill_random_buf(struct frand_state *, void *buf, unsigned int len);
135 extern void __fill_random_buf_percentage(unsigned long, void *, unsigned int, unsigned int, unsigned int, char *, unsigned int);
136 extern unsigned long fill_random_buf_percentage(struct frand_state *, void *, unsigned int, unsigned int, unsigned int, char *, unsigned int);