1 files changed, 12 insertions, 4 deletions

diff --git a/shell/random.h b/shell/random.h
index 180c48abb..c4eb44c13 100644
--- a/shell/random.h
+++ b/shell/random.h
@@ -12,16 +12,24 @@
 PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
 
 typedef struct random_t {
-        /* Random number generators */
-        int32_t galois_LFSR; /* Galois LFSR (fast but weak). signed! */
-        uint32_t LCG;        /* LCG (fast but weak) */
+        /* State of random number generators: */
+
+        /* Galois LFSR (fast but weak) */
+        int32_t galois_LFSR; /* must be signed! */
+
+        /* LCG (fast but weak) */
+        uint32_t LCG;
+
+        /* 64-bit xorshift (fast, moderate strength) */
+        uint32_t xs64_x;
+        uint32_t xs64_y;
 } random_t;
 
 #define UNINITED_RANDOM_T(rnd) \
         ((rnd)->galois_LFSR == 0)
 
 #define INIT_RANDOM_T(rnd, nonzero, v) \
-        ((rnd)->galois_LFSR = (nonzero), (rnd)->LCG = (v))
+        ((rnd)->galois_LFSR = (rnd)->xs64_x = (nonzero), (rnd)->LCG = (rnd)->xs64_y = (v))
 
 #define CLEAR_RANDOM_T(rnd) \
         ((rnd)->galois_LFSR = 0)