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+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+/*
+ * Copyright (c) 1987, 1988 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley.  The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ *	@(#)disklabel.h	7.10 (Berkeley) 6/27/88
+ */
+
+#ifndef	_DISK_STATUS_H_
+#define	_DISK_STATUS_H_
+
+/*
+ * Each disk has a label which includes information about the hardware
+ * disk geometry, filesystem partitions, and drive specific information.
+ * The label is in block 0 or 1, possibly offset from the beginning
+ * to leave room for a bootstrap, etc.
+ */
+
+#define LABELSECTOR	0			/* sector containing label */
+#define LABELOFFSET	64			/* offset of label in sector */
+#define DISKMAGIC	((unsigned int) 0x82564557U)	/* The disk magic number */
+#ifndef MAXPARTITIONS
+#define	MAXPARTITIONS	8
+#endif
+
+
+#ifndef LOCORE
+struct disklabel {
+	unsigned int	d_magic;		/* the magic number */
+	short	d_type;			/* drive type */
+	short	d_subtype;		/* controller/d_type specific */
+	char	d_typename[16];		/* type name, e.g. "eagle" */
+	/* 
+	 * d_packname contains the pack identifier and is returned when
+	 * the disklabel is read off the disk or in-core copy.
+	 * d_boot0 and d_boot1 are the (optional) names of the
+	 * primary (block 0) and secondary (block 1-15) bootstraps
+	 * as found in /usr/mdec.  These are returned when using
+	 * getdiskbyname(3) to retrieve the values from /etc/disktab.
+	 */
+#if defined(MACH_KERNEL) || defined(STANDALONE)
+	char	d_packname[16];			/* pack identifier */ 
+#else
+	union {
+		char	un_d_packname[16];	/* pack identifier */ 
+		struct {
+			char *un_d_boot0;	/* primary bootstrap name */
+			char *un_d_boot1;	/* secondary bootstrap name */
+		} un_b; 
+	} d_un; 
+#define d_packname	d_un.un_d_packname
+#define d_boot0		d_un.un_b.un_d_boot0
+#define d_boot1		d_un.un_b.un_d_boot1
+#endif	/* ! MACH_KERNEL or STANDALONE */
+			/* disk geometry: */
+	unsigned int	d_secsize;		/* # of bytes per sector */
+	unsigned int	d_nsectors;		/* # of data sectors per track */
+	unsigned int	d_ntracks;		/* # of tracks per cylinder */
+	unsigned int	d_ncylinders;		/* # of data cylinders per unit */
+	unsigned int	d_secpercyl;		/* # of data sectors per cylinder */
+	unsigned int	d_secperunit;		/* # of data sectors per unit */
+	/*
+	 * Spares (bad sector replacements) below
+	 * are not counted in d_nsectors or d_secpercyl.
+	 * Spare sectors are assumed to be physical sectors
+	 * which occupy space at the end of each track and/or cylinder.
+	 */
+	unsigned short	d_sparespertrack;	/* # of spare sectors per track */
+	unsigned short	d_sparespercyl;		/* # of spare sectors per cylinder */
+	/*
+	 * Alternate cylinders include maintenance, replacement,
+	 * configuration description areas, etc.
+	 */
+	unsigned int	d_acylinders;		/* # of alt. cylinders per unit */
+
+			/* hardware characteristics: */
+	/*
+	 * d_interleave, d_trackskew and d_cylskew describe perturbations
+	 * in the media format used to compensate for a slow controller.
+	 * Interleave is physical sector interleave, set up by the formatter
+	 * or controller when formatting.  When interleaving is in use,
+	 * logically adjacent sectors are not physically contiguous,
+	 * but instead are separated by some number of sectors.
+	 * It is specified as the ratio of physical sectors traversed
+	 * per logical sector.  Thus an interleave of 1:1 implies contiguous
+	 * layout, while 2:1 implies that logical sector 0 is separated
+	 * by one sector from logical sector 1.
+	 * d_trackskew is the offset of sector 0 on track N
+	 * relative to sector 0 on track N-1 on the same cylinder.
+	 * Finally, d_cylskew is the offset of sector 0 on cylinder N
+	 * relative to sector 0 on cylinder N-1.
+	 */
+	unsigned short	d_rpm;			/* rotational speed */
+	unsigned short	d_interleave;		/* hardware sector interleave */
+	unsigned short	d_trackskew;		/* sector 0 skew, per track */
+	unsigned short	d_cylskew;		/* sector 0 skew, per cylinder */
+	unsigned int	d_headswitch;		/* head switch time, usec */
+	unsigned int	d_trkseek;		/* track-to-track seek, usec */
+	unsigned int	d_flags;		/* generic flags */
+#define NDDATA 5
+	unsigned int	d_drivedata[NDDATA];	/* drive-type specific information */
+#define NSPARE 5
+	unsigned int	d_spare[NSPARE];	/* reserved for future use */
+	unsigned int	d_magic2;		/* the magic number (again) */
+	unsigned short	d_checksum;		/* xor of data incl. partitions */
+
+			/* filesystem and partition information: */
+	unsigned short	d_npartitions;		/* number of partitions in following */
+	unsigned int	d_bbsize;		/* size of boot area at sn0, bytes */
+	unsigned int	d_sbsize;		/* max size of fs superblock, bytes */
+	struct	partition {		/* the partition table */
+		unsigned int	p_size;		/* number of sectors in partition */
+		unsigned int	p_offset;	/* starting sector */
+		unsigned int	p_fsize;	/* filesystem basic fragment size */
+		unsigned char	p_fstype;	/* filesystem type, see below */
+		unsigned char	p_frag;		/* filesystem fragments per block */
+		unsigned short	p_cpg;		/* filesystem cylinders per group */
+	} d_partitions[MAXPARTITIONS+1];	/* actually may be more */
+
+#if	defined(alpha) && defined(MACH_KERNEL)
+	/*
+	 * Disgusting hack. If this structure contains a pointer,
+	 * as it does for non-kernel, then the compiler rounds
+	 * the size to make it pointer-sized properly (arrays of..).
+	 * But if I define the pointer for the kernel then instances
+	 * of this structure better be aligned otherwise picking
+	 * up a short might be done by too-smart compilers (GCC) with
+	 * a load-long instruction expecting the short to be aligned.
+	 * I bet the OSF folks stomped into this too, since they use
+	 * the same disgusting hack below.. [whatelse can I do ??]
+	 */
+	int	bugfix;
+#endif
+};
+#else LOCORE
+	/*
+	 * offsets for asm boot files.
+	 */
+	.set	d_secsize,40
+	.set	d_nsectors,44
+	.set	d_ntracks,48
+	.set	d_ncylinders,52
+	.set	d_secpercyl,56
+	.set	d_secperunit,60
+	.set	d_end_,276		/* size of disk label */
+#endif LOCORE
+
+/* d_type values: */
+#define	DTYPE_SMD		1		/* SMD, XSMD; VAX hp/up */
+#define	DTYPE_MSCP		2		/* MSCP */
+#define	DTYPE_DEC		3		/* other DEC (rk, rl) */
+#define	DTYPE_SCSI		4		/* SCSI */
+#define	DTYPE_ESDI		5		/* ESDI interface */
+#define	DTYPE_ST506		6		/* ST506 etc. */
+#define	DTYPE_FLOPPY		10		/* floppy */
+
+#ifdef DKTYPENAMES
+static char *dktypenames[] = {
+	"unknown",
+	"SMD",
+	"MSCP",
+	"old DEC",
+	"SCSI",
+	"ESDI",
+	"type 6",
+	"type 7",
+	"type 8",
+	"type 9",
+	"floppy",
+	0
+};
+#define DKMAXTYPES	(sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
+#endif
+
+/*
+ * Filesystem type and version.
+ * Used to interpret other filesystem-specific
+ * per-partition information.
+ */
+#define	FS_UNUSED	0		/* unused */
+#define	FS_SWAP		1		/* swap */
+#define	FS_V6		2		/* Sixth Edition */
+#define	FS_V7		3		/* Seventh Edition */
+#define	FS_SYSV		4		/* System V */
+#define	FS_V71K		5		/* V7 with 1K blocks (4.1, 2.9) */
+#define	FS_V8		6		/* Eighth Edition, 4K blocks */
+#define	FS_BSDFFS	7		/* 4.2BSD fast file system */
+#define FS_LINUXFS	8		/* Linux file system */
+
+#ifdef	DKTYPENAMES
+static char *fstypenames[] = {
+	"unused",
+	"swap",
+	"Version 6",
+	"Version 7",
+	"System V",
+	"4.1BSD",
+	"Eighth Edition",
+	"4.2BSD",
+	"Linux",
+	0
+};
+#define FSMAXTYPES	(sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
+#endif
+
+/*
+ * flags shared by various drives:
+ */
+#define		D_REMOVABLE	0x01		/* removable media */
+#define		D_ECC		0x02		/* supports ECC */
+#define		D_BADSECT	0x04		/* supports bad sector forw. */
+#define		D_RAMDISK	0x08		/* disk emulator */
+#define		D_CHAIN		0x10		/* can do back-back transfers */
+
+/*
+ * Drive data for SMD.
+ */
+#define	d_smdflags	d_drivedata[0]
+#define		D_SSE		0x1		/* supports skip sectoring */
+#define	d_mindist	d_drivedata[1]
+#define	d_maxdist	d_drivedata[2]
+#define	d_sdist		d_drivedata[3]
+
+/*
+ * Drive data for ST506.
+ */
+#define d_precompcyl	d_drivedata[0]
+#define d_gap3		d_drivedata[1]		/* used only when formatting */
+
+/*
+ * IBM controller info (d_precompcyl used, too)
+ */
+#define	d_step		d_drivedata[2]
+
+#ifndef LOCORE
+/*
+ * Structure used to perform a format
+ * or other raw operation, returning data
+ * and/or register values.
+ * Register identification and format
+ * are device- and driver-dependent.
+ */
+struct format_op {
+	char	*df_buf;
+	int	df_count;		/* value-result */
+	recnum_t	df_startblk;
+	int	df_reg[8];		/* result */
+};
+
+/*
+ * Disk-specific ioctls.
+ */
+		/* get and set disklabel; DIOCGPART used internally */
+#define DIOCGDINFO	_IOR('d', 101, struct disklabel)/* get */
+#define DIOCSDINFO	_IOW('d', 102, struct disklabel)/* set */
+#define DIOCWDINFO	_IOW('d', 103, struct disklabel)/* set, update disk */
+
+/* do format operation, read or write */
+#define DIOCRFORMAT	_IOWR('d', 105, struct format_op)
+#define DIOCWFORMAT	_IOWR('d', 106, struct format_op)
+
+#define DIOCSSTEP	_IOW('d', 107, int)	/* set step rate */
+#define DIOCSRETRIES	_IOW('d', 108, int)	/* set # of retries */
+#define DIOCWLABEL	_IOW('d', 109, int)	/* write en/disable label */
+
+#define DIOCSBAD	_IOW('d', 110, struct dkbad)	/* set kernel dkbad */
+
+#endif LOCORE
+
+#endif	/* _DISK_STATUS_H_ */