GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

2026-09-06 03:52:57 +08:00
commit b1928b41c0
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+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Simple xorshift PRNG
+ *   see http://www.jstatsoft.org/v08/i14/paper
+ *
+ * Copyright (c) 2012 Michael Walle
+ * Michael Walle <michael@walle.cc>
+ */
+
+#include <common.h>
+#include <rand.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;
+}