Home | History | Annotate | Line # | Download | only in include
disklabel.h revision 1.7 
      1 /*	$NetBSD: disklabel.h,v 1.7 2013/04/04 12:50:03 martin Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1994 Christopher G. Demetriou
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *      This product includes software developed by Christopher G. Demetriou.
     18  * 4. The name of the author may not be used to endorse or promote products
     19  *    derived from this software without specific prior written permission
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 #ifndef _MACHINE_DISKLABEL_H_
     34 #define _MACHINE_DISKLABEL_H_
     35 
     36 #define LABELUSESMBR		0	/* no MBR partitionning */
     37 #define	LABELSECTOR		0	/* sector containing label */
     38 #define	LABELOFFSET		64	/* offset of label in sector */
     39 #define	MAXPARTITIONS		12	/* number of partitions */
     40 #define	OLDMAXPARTITIONS 	8	/* number of partitions before nb-6 */
     41 #define	RAW_PART		2	/* raw partition: xx?c */
     42 /*
     43  * In NetBSD 6 we eroneously used a too large MAXPARTITIONS value (disklabel
     44  * overlapped with important parts of the bootblocks and made some machines
     45  * unbootable).
     46  */
     47 #define	__TMPBIGMAXPARTITIONS	16	/* compatibility with 6.0 installs */
     48 
     49 /*
     50  * We use the highest bit of the minor number for the partition number.
     51  * This maintains backward compatibility with device nodes created before
     52  * MAXPARTITIONS was increased.
     53  * Temporarily MAXPARTITIONS was 16, so we use that to keep compatibility
     54  * with existing installations.
     55  */
     56 #define __VAX_MAXDISKS	((1 << 20) / __TMPBIGMAXPARTITIONS)
     57 #define DISKUNIT(dev)	((minor(dev) / OLDMAXPARTITIONS) % __VAX_MAXDISKS)
     58 #define DISKPART(dev)	((minor(dev) % OLDMAXPARTITIONS) + \
     59     ((minor(dev) / (__VAX_MAXDISKS * OLDMAXPARTITIONS)) * OLDMAXPARTITIONS))
     60 #define	DISKMINOR(unit, part) \
     61     (((unit) * OLDMAXPARTITIONS) + ((part) % OLDMAXPARTITIONS) + \
     62      ((part) / OLDMAXPARTITIONS) * (__VAX_MAXDISKS * OLDMAXPARTITIONS))
     63 
     64 /* Just a dummy */
     65 #ifndef _LOCORE
     66 struct cpu_disklabel {
     67 	int	cd_dummy;			/* must have one element. */
     68 };
     69 #endif
     70 #endif /* _MACHINE_DISKLABEL_H_ */
     71