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disklabel.h revision 1.7
      1 /*	$NetBSD: disklabel.h,v 1.7 2001/07/26 23:07:57 wiz 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  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *      This product includes software developed by Leo Weppelman.
     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 /*
     37  * On a volume, exclusively used by NetBSD, the boot block starts at
     38  * sector 0. To allow shared use of a volume between two or more OS's,
     39  * the vendor specific AHDI format is supported. In this case the boot
     40  * block is located at the start of an AHDI partition. In any case the
     41  * size of the boot block must be at least 8KB.
     42  */
     43 #define	BBMINSIZE	8192		/* minimum size of boot block      */
     44 #define LABELSECTOR	0		/* `natural' start of boot block   */
     45 #define LABELOFFSET	516		/* offset of disk label in bytes,
     46 					   relative to start of boot block */
     47 #define LABELMAXSIZE	1020		/* maximum size of disk label, at
     48 					   least (MAXPARTITIONS * 16 + 152)*/
     49 #define MAXPARTITIONS	16		/* max. # of NetBSD partitions     */
     50 #define SWAP_PART	1		/* xx?b is default swap partition  */
     51 #define RAW_PART	2		/* xx?c is raw partition	   */
     52 
     53 #define MAXAUXROOTS	29		/* max. # of auxiliary root sectors */
     54 
     55 struct cpu_disklabel {
     56 	u_int		cd_bblock;	/* start of NetBSD boot block      */
     57 #define NO_BOOT_BLOCK	((u_int)-1)
     58 	u_int		cd_label;	/* offset of NetBSD disk label     */
     59 #ifdef DISKLABEL_AHDI
     60 	u_int		cd_bslst;	/* start of AHDI bad sector list   */
     61 	u_int		cd_bslend;	/* end of AHDI bad sector list     */
     62 	u_int		cd_roots[MAXAUXROOTS+1]; /* auxiliary root sectors  */
     63 #endif /* DISKLABEL_AHDI */
     64 };
     65 
     66 struct bootblock {
     67 	u_int8_t	bb_xxboot[LABELOFFSET - sizeof(u_int32_t)];
     68 						/* first-stage boot loader */
     69 	u_int32_t	bb_magic;		/* boot block magic number */
     70 #define	NBDAMAGIC	0x4e424441 /* 'NBDA' */
     71 #define	AHDIMAGIC	0x41484449 /* 'AHDI' */
     72 	u_int8_t	bb_label[LABELMAXSIZE];	/* disk pack label         */
     73 	u_int8_t	bb_bootxx[BBMINSIZE - LABELOFFSET - LABELMAXSIZE];
     74 						/* second-stage boot loader*/
     75 };
     76 
     77 struct disklabel;
     78 #define	BBGETLABEL(bb, dl)	*(dl) = *((struct disklabel *)(bb)->bb_label)
     79 #define	BBSETLABEL(bb, dl)	*((struct disklabel *)(bb)->bb_label) = *(dl)
     80 
     81 #endif /* _MACHINE_DISKLABEL_H_ */
     82