1 files changed, 75 insertions, 0 deletions

diff --git a/sys/dev/random/uint128.h b/sys/dev/random/uint128.h
new file mode 100644
index 000000000000..b2cc1e0624b2
--- /dev/null
+++ b/sys/dev/random/uint128.h
@@ -0,0 +1,75 @@
+/*-
+ * Copyright (c) 2014 Mark R V Murray
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer
+ *    in this position and unchanged.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef SYS_DEV_RANDOM_UINT128_H_INCLUDED
+#define SYS_DEV_RANDOM_UINT128_H_INCLUDED
+
+/* This whole thing is a crock :-(
+ *
+ * Everyone knows you always need the __uint128_t types!
+ */
+
+#ifdef __SIZEOF_INT128__
+typedef __uint128_t uint128_t;
+#else
+typedef uint64_t uint128_t[2];
+#endif
+
+static __inline void
+uint128_clear(uint128_t *big_uint)
+{
+#ifdef __SIZEOF_INT128__
+	(*big_uint) = 0ULL;
+#else
+	(*big_uint)[0] = (*big_uint)[1] = 0UL;
+#endif
+}
+
+static __inline void
+uint128_increment(uint128_t *big_uint)
+{
+#ifdef __SIZEOF_INT128__
+	(*big_uint)++;
+#else
+	(*big_uint)[0]++;
+	if ((*big_uint)[0] == 0UL)
+		(*big_uint)[1]++;
+#endif
+}
+
+static __inline int
+uint128_is_zero(uint128_t big_uint)
+{
+#ifdef __SIZEOF_INT128__
+	return (big_uint == 0ULL);
+#else
+	return (big_uint[0] == 0UL && big_uint[1] == 0UL);
+#endif
+}
+
+#endif /* SYS_DEV_RANDOM_UINT128_H_INCLUDED */