Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / lib / rand.c

diff --git a/qemu/roms/u-boot/lib/rand.c b/qemu/roms/u-boot/lib/rand.c
new file mode 100644 (file)
index 0000000..5c367e1
--- /dev/null
+++ b/qemu/roms/u-boot/lib/rand.c
@@ -0,0 +1,32 @@
+/*
+ * Simple xorshift PRNG
+ *   see http://www.jstatsoft.org/v08/i14/paper
+ *
+ * Copyright (c) 2012 Michael Walle
+ * Michael Walle <michael@walle.cc>
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+
+static unsigned int y = 1U;
+
+unsigned int rand_r(unsigned int *seedp)
+{
+       *seedp ^= (*seedp << 13);
+       *seedp ^= (*seedp >> 17);
+       *seedp ^= (*seedp << 5);
+
+       return *seedp;
+}
+
+unsigned int rand(void)
+{
+       return rand_r(&y);
+}
+
+void srand(unsigned int seed)
+{
+       y = seed;
+}