diff --git a/sys/alpha/include/swiz.h b/sys/alpha/include/swiz.h
new file mode 100644
index 000000000000..0305952360a4
--- /dev/null
+++ b/sys/alpha/include/swiz.h
@@ -0,0 +1,67 @@
+/*-
+ * Copyright (c) 1998 Doug Rabson
+ * 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.
+ * 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 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 AUTHOR 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.
+ *
+ *	$Id$
+ */
+
+#ifndef _MACHINE_SWIZ_H_
+#define	_MACHINE_SWIZ_H_
+
+/*
+ * Macros for accessing device ports or memory in a sparse address space.
+ */
+
+#define SPARSE_READ(o)			(*(u_int32_t*) (o))
+#define SPARSE_WRITE(o, d)		(*(u_int32_t*) (o) = (d))
+
+#define SPARSE_BYTE_OFFSET(o)		(((o) << 5) | (0 << 3))
+#define SPARSE_WORD_OFFSET(o)		(((o) << 5) | (1 << 3))
+#define SPARSE_LONG_OFFSET(o)		(((o) << 5) | (3 << 3))
+
+#define SPARSE_BYTE_EXTRACT(o, d)	((d) >> (8*((o) & 3)))
+#define SPARSE_WORD_EXTRACT(o, d)	((d) >> (8*((o) & 2)))
+
+#define SPARSE_BYTE_INSERT(o, d)	((d) << (8*((o) & 3)))
+#define SPARSE_WORD_INSERT(o, d)	((d) << (8*((o) & 2)))
+
+#define SPARSE_READ_BYTE(base, o)	\
+	SPARSE_BYTE_EXTRACT(o, SPARSE_READ(base + SPARSE_BYTE_OFFSET(o)))
+
+#define SPARSE_READ_WORD(base, o)	\
+	SPARSE_WORD_EXTRACT(o, SPARSE_READ(base + SPARSE_WORD_OFFSET(o)))
+
+#define SPARSE_READ_LONG(base, o)	\
+	SPARSE_READ(base + SPARSE_LONG_OFFSET(o))
+
+#define SPARSE_WRITE_BYTE(base, o, d)	\
+	SPARSE_WRITE(base + SPARSE_BYTE_OFFSET(o), SPARSE_BYTE_INSERT(o, d))
+
+#define SPARSE_WRITE_WORD(base, o, d)	\
+	SPARSE_WRITE(base + SPARSE_WORD_OFFSET(o), SPARSE_WORD_INSERT(o, d))
+
+#define SPARSE_WRITE_LONG(base, o, d)	\
+	SPARSE_WRITE(base + SPARSE_LONG_OFFSET(o), d)
+
+#endif /* !_MACHINE_SWIZ_H_ */