1 files changed, 63 insertions, 0 deletions
diff --git a/StdLib/Include/Aarch64/machine/byte_swap.h b/StdLib/Include/Aarch64/machine/byte_swap.h
new file mode 100644
index 0000000000..8e1272c518
--- /dev/null
+++ b/StdLib/Include/Aarch64/machine/byte_swap.h
@@ -0,0 +1,63 @@
+/*-
+ * Copyright (c) 1997, 1999, 2002 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Charles M. Hannum, Neil A. Carson, and Jason R. Thorpe.
+ *
+ * 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.
+ * 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``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 FOUNDATION OR CONTRIBUTORS
+ * 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.
+ */
+
+#ifndef _AARCH64_BYTE_SWAP_H_
+#define _AARCH64_BYTE_SWAP_H_
+
+#ifdef __GNUC__
+#include <sys/types.h>
+__BEGIN_DECLS
+
+#define __BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable
+static __inline uint32_t
+__byte_swap_u32_variable(uint32_t v)
+{
+        uint32_t t1;
+
+        t1 = v ^ ((v << 16) | (v >> 16));
+        t1 &= 0xff00ffffU;
+        v = (v >> 8) | (v << 24);
+        v ^= (t1 >> 8);
+        return (v);
+}
+
+#define __BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable
+static __inline uint16_t
+__byte_swap_u16_variable(uint16_t v)
+{
+
+        v &= 0xffff;
+        v = (v >> 8) | (v << 8);
+        return (v);
+}
+
+__END_DECLS
+#endif
+
+#endif /* _AARCH64_BYTE_SWAP_H_ */