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disklabel.h revision 1.9 
      1 /*	$NetBSD: disklabel.h,v 1.9 2011/08/30 12:39:53 bouyer Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1995 Leo Weppelman.
      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  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #ifndef _MACHINE_DISKLABEL_H_
     29 #define _MACHINE_DISKLABEL_H_
     30 
     31 /*
     32  * On a volume, exclusively used by NetBSD, the boot block starts at
     33  * sector 0. To allow shared use of a volume between two or more OS's,
     34  * the vendor specific AHDI format is supported. In this case the boot
     35  * block is located at the start of an AHDI partition. In any case the
     36  * size of the boot block must be at least 8KB.
     37  */
     38 #define	BBMINSIZE	8192		/* minimum size of boot block      */
     39 #define LABELUSESMBR	0			/* no MBR partitionning */
     40 #define LABELSECTOR	0		/* `natural' start of boot block   */
     41 #define LABELOFFSET	516		/* offset of disk label in bytes,
     42 					   relative to start of boot block */
     43 #define LABELMAXSIZE	1020		/* maximum size of disk label, at
     44 					   least (MAXPARTITIONS * 16 + 152)*/
     45 #define MAXPARTITIONS	16		/* max. # of NetBSD partitions     */
     46 #define SWAP_PART	1		/* xx?b is default swap partition  */
     47 #define RAW_PART	2		/* xx?c is raw partition	   */
     48 
     49 #define MAXAUXROOTS	29		/* max. # of auxiliary root sectors */
     50 
     51 struct cpu_disklabel {
     52 	u_int		cd_bblock;	/* start of NetBSD boot block      */
     53 #define NO_BOOT_BLOCK	((u_int)-1)
     54 	u_int		cd_label;	/* offset of NetBSD disk label     */
     55 #ifdef DISKLABEL_AHDI
     56 	u_int		cd_bslst;	/* start of AHDI bad sector list   */
     57 	u_int		cd_bslend;	/* end of AHDI bad sector list     */
     58 	u_int		cd_roots[MAXAUXROOTS+1]; /* auxiliary root sectors  */
     59 #endif /* DISKLABEL_AHDI */
     60 };
     61 
     62 struct bootblock {
     63 	u_int8_t	bb_xxboot[LABELOFFSET - sizeof(u_int32_t)];
     64 						/* first-stage boot loader */
     65 	u_int32_t	bb_magic;		/* boot block magic number */
     66 #define	NBDAMAGIC	0x4e424441 /* 'NBDA' */
     67 #define	AHDIMAGIC	0x41484449 /* 'AHDI' */
     68 	u_int8_t	bb_label[LABELMAXSIZE];	/* disk pack label         */
     69 	u_int8_t	bb_bootxx[BBMINSIZE - LABELOFFSET - LABELMAXSIZE];
     70 						/* second-stage boot loader*/
     71 };
     72 
     73 struct disklabel;
     74 #define	BBGETLABEL(bb, dl)	*(dl) = *((struct disklabel *)(bb)->bb_label)
     75 #define	BBSETLABEL(bb, dl)	*((struct disklabel *)(bb)->bb_label) = *(dl)
     76 
     77 #endif /* _MACHINE_DISKLABEL_H_ */
     78