diff --git a/diskmbr.h b/diskmbr.h
new file mode 100644
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--- /dev/null
+++ b/diskmbr.h
@@ -0,0 +1,72 @@
+/*-
+ * Copyright (c) 1987, 1988, 1993
+ *      The Regents of the University of California.  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.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+ *
+ *      @(#)disklabel.h 8.2 (Berkeley) 7/10/94
+ * $FreeBSD: src/sys/sys/diskmbr.h,v 1.99.2.1 2005/01/31 23:26:56 imp Exp $
+ */
+
+#ifndef _SYS_DISKMBR_H_
+#define _SYS_DISKMBR_H_
+
+#define DOSBBSECTOR     0       /* DOS boot block relative sector number */
+#define DOSPARTOFF      446
+#define DOSPARTSIZE     16
+#define NDOSPART        4
+#define NEXTDOSPART     32
+#define DOSMAGICOFFSET  510
+#define DOSMAGIC        0xAA55
+
+#define DOSPTYP_386BSD  0xa5    /* 386BSD partition type */
+#define DOSPTYP_LINSWP  0x82    /* Linux swap partition */
+#define DOSPTYP_LINUX   0x83    /* Linux partition */
+#define DOSPTYP_PMBR    0xee    /* GPT Protective MBR */
+#define DOSPTYP_EXT     5       /* DOS extended partition */
+#define DOSPTYP_EXTLBA  15      /* DOS extended partition */
+
+struct dos_partition {
+        unsigned char   dp_flag;        /* bootstrap flags */
+        unsigned char   dp_shd;         /* starting head */
+        unsigned char   dp_ssect;       /* starting sector */
+        unsigned char   dp_scyl;        /* starting cylinder */
+        unsigned char   dp_typ;         /* partition type */
+        unsigned char   dp_ehd;         /* end head */
+        unsigned char   dp_esect;       /* end sector */
+        unsigned char   dp_ecyl;        /* end cylinder */
+        u_int32_t       dp_start;       /* absolute starting sector number */
+        u_int32_t       dp_size;        /* partition size in sectors */
+};
+#ifdef CTASSERT
+CTASSERT(sizeof (struct dos_partition) == DOSPARTSIZE);
+#endif
+
+#define DPSECT(s) ((s) & 0x3f)          /* isolate relevant bits of sector */
+#define DPCYL(c, s) ((c) + (((s) & 0xc0)<<2)) /* and those that are cylinder */
+
+#define DIOCSMBR        _IOW('M', 129, u_char[512])
+
+#endif /* !_SYS_DISKMBR_H_ */