NetBSD/sys/arch/mvme68k/include/disklabel.h

/*	$NetBSD: disklabel.h,v 1.4 1996/05/16 17:52:51 chuck Exp $	*/

/*
 * Copyright (c) 1995 Dale Rahn.
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *   This product includes software developed by Dale Rahn.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
 */  

#ifndef _MACHINE_DISKLABEL_H_
#define _MACHINE_DISKLABEL_H_

/* number of boot pieces , ie xxboot bootxx */
#define NUMBOOT		0

#define	PARTITIONSHIFT	3 /* could also be 4 if you need 16 partitions */

#define LABELSECTOR     0                       /* sector containing label */
#define LABELOFFSET	0			/* offset of label in sector */
#define MAXPARTITIONS	(1 << PARTITIONSHIFT)	/* number of partitions */
#define RAW_PART	2			/* raw partition: xx?c */

/* 
 * used to encode disk minor numbers
 * this should probably be moved to sys/disklabel.h
 */
#define DISKUNIT(dev)	(minor(dev) / MAXPARTITIONS)
#define DISKPART(dev)	(minor(dev) % MAXPARTITIONS)
#define MAKEDISKDEV(maj, unit, part) \
    (makedev((maj), ((unit) * MAXPARTITIONS) + (part)))

/*
 * a cpu_disklabel is a disklabel that the bug (prom) can understand
 * and live with.   the bug works in terms of 256 byte blocks.   in our
 * case the first two bug blocks make up the cpu_disklabel (which is 512
 * bytes [i.e. one sector] in length).
 *
 * we use a fixed layout the BSD disk structure (in 256 byte blocks):
 *   block 0  = the volume ID block  (part of cpu_disklabel)
 *   block 1  = media configuration area (part of cpu_disklabel)
 *   block 2  = start of first level OS bootstrap (continues ...)
 *   block 31 = end of OS bootstrap
 *   block 32 = BSD filesystem superblock
 *
 * this gives us 30 blocks (30*256 = 7680 bytes) for the bootstrap's text+data
 *
 * disksubr.c translates between cpu_disklabel and BSD disklabel.
 *
 */

struct cpu_disklabel {
	/* VID */
	u_char  vid_id[4];	/* volume ID */
#define VID_ID		"NBSD"
	u_char  vid_0[16];
	u_int   vid_oss;	/* starting block # of bootstrap */
#define VID_OSS		2
	u_short	vid_osl;	/* bootstrap length (30 blocks) */
#define VID_OSL		30
	u_char	vid_1[4];
	u_short	vid_osa_u;	/* bootstrap start address (upper) */
	u_short	vid_osa_l;	/* bootstrap start address (lower) */
#define VID_OSA		0x3f0000	/* MUST match bootstrap code */
#define VID_OSAU	((VID_OSA >> 16) & 0xffff)
#define VID_OSAL	(VID_OSA & 0xffff)
	u_char	vid_2[2];
	u_short	partitions;
	u_char	vid_vd[16];
	u_long	bbsize;
	u_long	magic1;		/* 4 */
	u_short	type;		/* 2 */
	u_short	subtype;	/* 2 */
	u_char	packname[16];	/* 16 */
	u_long	flags;		/* 4 */
	u_long	drivedata[5];	/* 4 */
	u_long	spare[5];	/* 4 */
	u_short	checksum;	/* 2 */

	u_long	secpercyl;	/* 4 */
	u_long	secperunit;	/* 4 */
	u_long	headswitch;	/* 4 */

	u_char	vid_3[4];
	u_int	vid_cas;	/* block # of CFG area, hardwired at 1 */
#define VID_CAS		1
	u_char	vid_cal;	/* length of CFG area, in blocks (1) */
#define VID_CAL		1
	u_char	vid_4_0[3];
	u_char	vid_4[64];
	u_char	vid_4_1[28];
	u_long	sbsize;
	u_char	vid_mot[8];	/* must contain "MOTOROLA" */
#define VID_MOT		"MOTOROLA"

	/* CFG */
	u_char	cfg_0[4];
	u_short	cfg_atm;
	u_short	cfg_prm;
	u_short	cfg_atw;
	u_short	cfg_rec;	/* block size (256) */
#define	CFG_REC		256

	u_short	sparespertrack;
	u_short	sparespercyl;
	u_long	acylinders;
	u_short	rpm;
	u_short	cylskew;

	u_char	cfg_spt;
	u_char	cfg_hds;
	u_short	cfg_trk;
	u_char	cfg_ilv;
	u_char	cfg_sof;
	u_short	cfg_psm;	/* physical sector size (512) */
#define CFG_PSM		512
	u_short	cfg_shd;
	u_char	cfg_2[2];
	u_short	cfg_pcom;
	u_char	cfg_3;
	u_char	cfg_ssr;
	u_short	cfg_rwcc;
	u_short	cfg_ecc;
	u_short	cfg_eatm;
	u_short	cfg_eprm;
	u_short	cfg_eatw;
	u_char	cfg_gpb1;
	u_char	cfg_gpb2;
	u_char	cfg_gpb3;
	u_char	cfg_gpb4;
	u_char	cfg_ssc;
	u_char	cfg_runit;
	u_short	cfg_rsvc1;
	u_short	cfg_rsvc2;
	u_long	magic2;
	u_char	cfg_4[192];
};
#endif _MACHINE_DISKLABEL_H_