xref: /src/sys/arch/i386/stand/lib/biosdisk_ll.h

/*	$NetBSD: biosdisk_ll.h,v 1.6 1999/04/28 23:24:42 fvdl Exp $	 */

/*
 * Copyright (c) 1996
 * 	Matthias Drochner.  All rights reserved.
 * Copyright (c) 1996
 * 	Perry E. Metzger.  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 acknowledgements:
 *	This product includes software developed for the NetBSD Project
 *	by Matthias Drochner.
 *	This product includes software developed for the NetBSD Project
 *	by Perry E. Metzger.
 * 4. The names of the authors 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.
 */

/*
 * shared by bootsector startup (bootsectmain) and biosdisk.c needs lowlevel
 * parts from bios_disk.S
 */

/*
 * Beware that bios_disk.S relies on the offsets of the structure
 * members.
 */
struct biosdisk_ll {
	int             dev;		/* BIOS device number */
	int             sec, head, cyl;	/* geometry */
	int		flags;		/* see below */
	int		chs_sectors;	/* # of sectors addressable by CHS */
};
#define	BIOSDISK_EXT13	1		/* BIOS supports int13 extension */

#if __GNUC__ == 2 && __GNUC_MINOR__ < 7
#pragma pack(1)
#endif

/*
 * Version 1.x drive parameters from int13 extensions. Should be supported
 * by every BIOS that supports the extensions.
 */

struct biosdisk_ext13info {
	u_int16_t	size;		/* size of buffer, set on call */
	u_int16_t	flags;		/* flags, see below */
	u_int32_t	cyl;		/* # of physical cylinders */
	u_int32_t	head;		/* # of physical heads */
	u_int32_t	sec;		/* # of physical sectors per track */
	u_int64_t	totsec;		/* total number of sectors */
	u_int16_t	sbytes;		/* # of bytes per sector */
} __attribute__((packed));

#define EXT13_DMA_TRANS		0x0001	/* transparent DMA boundary errors */
#define EXT13_GEOM_VALID	0x0002	/* geometry in c/h/s in struct valid */
#define EXT13_REMOVABLE		0x0004	/* removable device */
#define EXT13_WRITEVERF		0x0008	/* supports write with verify */
#define EXT13_CHANGELINE	0x0010	/* changeline support */
#define EXT13_LOCKABLE		0x0020	/* device is lockable */
#define EXT13_MAXGEOM		0x0040	/* geometry set to max; no media */

#if __GNUC__ == 2 && __GNUC_MINOR__ < 7
#pragma pack(4)
#endif

#define BIOSDISK_SECSIZE 512

int set_geometry __P((struct biosdisk_ll *, struct biosdisk_ext13info *));
int readsects   __P((struct biosdisk_ll *, int, int, char *, int));