X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=lib%2Frand.c;h=9c3e0d6a39e181149ad04ac5c36f7220d115de95;hp=cecc4c21ea90a28775f6e187a24c52429ab4f2f5;hb=de4096e8682a064ed9125af7ac30a3fe4021167b;hpb=79c94bd37280c76a4e8e01ea008ba1853f7bef9c

diff --git a/lib/rand.c b/lib/rand.c
index cecc4c21..9c3e0d6a 100644
--- a/lib/rand.c
+++ b/lib/rand.c
@@ -33,27 +33,167 @@
 
 */
 
+#include <string.h>
+#include <assert.h>
 #include "rand.h"
+#include "lib/pattern.h"
+#include "../hash.h"
 
-struct frand_state __fio_rand_state;
+int arch_random;
 
-static inline int __seed(unsigned int x, unsigned int m)
+static inline uint64_t __seed(uint64_t x, uint64_t m)
 {
 	return (x < m) ? x + m : x;
 }
 
-void init_rand(struct frand_state *state)
+static void __init_rand32(struct taus88_state *state, unsigned int seed)
 {
-#define LCG(x)  ((x) * 69069)   /* super-duper LCG */
+	int cranks = 6;
 
-	state->s1 = __seed(LCG((2^31) + (2^17) + (2^7)), 1);
-	state->s2 = __seed(LCG(state->s1), 7);
-	state->s3 = __seed(LCG(state->s2), 15);
+#define LCG(x, seed)  ((x) * 69069 ^ (seed))
 
-	__rand(state);
-	__rand(state);
-	__rand(state);
-	__rand(state);
-	__rand(state);
-	__rand(state);
+	state->s1 = __seed(LCG((2^31) + (2^17) + (2^7), seed), 1);
+	state->s2 = __seed(LCG(state->s1, seed), 7);
+	state->s3 = __seed(LCG(state->s2, seed), 15);
+
+	while (cranks--)
+		__rand32(state);
+}
+
+static void __init_rand64(struct taus258_state *state, uint64_t seed)
+{
+	int cranks = 6;
+
+#define LCG64(x, seed)  ((x) * 6906969069ULL ^ (seed))
+
+	state->s1 = __seed(LCG64((2^31) + (2^17) + (2^7), seed), 1);
+	state->s2 = __seed(LCG64(state->s1, seed), 7);
+	state->s3 = __seed(LCG64(state->s2, seed), 15);
+	state->s4 = __seed(LCG64(state->s3, seed), 33);
+	state->s5 = __seed(LCG64(state->s4, seed), 49);
+
+	while (cranks--)
+		__rand64(state);
+}
+
+void init_rand(struct frand_state *state, bool use64)
+{
+	state->use64 = use64;
+
+	if (!use64)
+		__init_rand32(&state->state32, 1);
+	else
+		__init_rand64(&state->state64, 1);
+}
+
+void init_rand_seed(struct frand_state *state, unsigned int seed, bool use64)
+{
+	state->use64 = use64;
+
+	if (!use64)
+		__init_rand32(&state->state32, seed);
+	else
+		__init_rand64(&state->state64, seed);
+}
+
+void __fill_random_buf(void *buf, unsigned int len, unsigned long seed)
+{
+	void *ptr = buf;
+
+	while (len) {
+		int this_len;
+
+		if (len >= sizeof(int64_t)) {
+			*((int64_t *) ptr) = seed;
+			this_len = sizeof(int64_t);
+		} else if (len >= sizeof(int32_t)) {
+			*((int32_t *) ptr) = seed;
+			this_len = sizeof(int32_t);
+		} else if (len >= sizeof(int16_t)) {
+			*((int16_t *) ptr) = seed;
+			this_len = sizeof(int16_t);
+		} else {
+			*((int8_t *) ptr) = seed;
+			this_len = sizeof(int8_t);
+		}
+		ptr += this_len;
+		len -= this_len;
+		seed *= GOLDEN_RATIO_PRIME;
+		seed >>= 3;
+	}
+}
+
+unsigned long fill_random_buf(struct frand_state *fs, void *buf,
+			      unsigned int len)
+{
+	unsigned long r = __rand(fs);
+
+	if (sizeof(int) != sizeof(long *))
+		r *= (unsigned long) __rand(fs);
+
+	__fill_random_buf(buf, len, r);
+	return r;
+}
+
+void __fill_random_buf_percentage(unsigned long seed, void *buf,
+				  unsigned int percentage,
+				  unsigned int segment, unsigned int len,
+				  char *pattern, unsigned int pbytes)
+{
+	unsigned int this_len;
+
+	if (percentage == 100) {
+		if (pbytes)
+			(void)cpy_pattern(pattern, pbytes, buf, len);
+		else
+			memset(buf, 0, len);
+		return;
+	}
+
+	if (segment > len)
+		segment = len;
+
+	while (len) {
+		/*
+		 * Fill random chunk
+		 */
+		this_len = (segment * (100 - percentage)) / 100;
+		if (this_len > len)
+			this_len = len;
+
+		__fill_random_buf(buf, this_len, seed);
+
+		len -= this_len;
+		if (!len)
+			break;
+		buf += this_len;
+
+		if (this_len > len)
+			this_len = len;
+		else if (len - this_len <= sizeof(long))
+			this_len = len;
+
+		if (pbytes)
+			(void)cpy_pattern(pattern, pbytes, buf, this_len);
+		else
+			memset(buf, 0, this_len);
+
+		len -= this_len;
+		buf += this_len;
+	}
+}
+
+unsigned long fill_random_buf_percentage(struct frand_state *fs, void *buf,
+					 unsigned int percentage,
+					 unsigned int segment, unsigned int len,
+					 char *pattern, unsigned int pbytes)
+{
+	unsigned long r = __rand(fs);
+
+	if (sizeof(int) != sizeof(long *))
+		r *= (unsigned long) __rand(fs);
+
+	__fill_random_buf_percentage(r, buf, percentage, segment, len,
+					pattern, pbytes);
+	return r;
 }