diskmbr.h

/*-
 * Copyright (c) 1987, 1988, 1993
 *      The Regents of the University of California.  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.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 *
 *      @(#)disklabel.h 8.2 (Berkeley) 7/10/94
 * $FreeBSD: src/sys/sys/diskmbr.h,v 1.99.2.1 2005/01/31 23:26:56 imp Exp $
 */

#ifndef _SYS_DISKMBR_H_
#define _SYS_DISKMBR_H_

#define DOSBBSECTOR     0       /* DOS boot block relative sector number */
#define DOSPARTOFF      446
#define DOSPARTSIZE     16
#define NDOSPART        4
#define NEXTDOSPART     32
#define DOSMAGICOFFSET  510
#define DOSMAGIC        0xAA55

#define DOSPTYP_386BSD  0xa5    /* 386BSD partition type */
#define DOSPTYP_LINSWP  0x82    /* Linux swap partition */
#define DOSPTYP_LINUX   0x83    /* Linux partition */
#define DOSPTYP_PMBR    0xee    /* GPT Protective MBR */
#define DOSPTYP_EXT     5       /* DOS extended partition */
#define DOSPTYP_EXTLBA  15      /* DOS extended partition */

struct dos_partition {
        unsigned char   dp_flag;        /* bootstrap flags */
        unsigned char   dp_shd;         /* starting head */
        unsigned char   dp_ssect;       /* starting sector */
        unsigned char   dp_scyl;        /* starting cylinder */
        unsigned char   dp_typ;         /* partition type */
        unsigned char   dp_ehd;         /* end head */
        unsigned char   dp_esect;       /* end sector */
        unsigned char   dp_ecyl;        /* end cylinder */
        u_int32_t       dp_start;       /* absolute starting sector number */
        u_int32_t       dp_size;        /* partition size in sectors */
};
#ifdef CTASSERT
CTASSERT(sizeof (struct dos_partition) == DOSPARTSIZE);
#endif

#define DPSECT(s) ((s) & 0x3f)          /* isolate relevant bits of sector */
#define DPCYL(c, s) ((c) + (((s) & 0xc0)<<2)) /* and those that are cylinder */

#define DIOCSMBR        _IOW('M', 129, u_char[512])

#endif /* !_SYS_DISKMBR_H_ */