The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/diskmbr.h

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    1 /*
    2  * Copyright (c) 1987, 1988, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)disklabel.h 8.2 (Berkeley) 7/10/94
   34  * $FreeBSD$
   35  * $DragonFly: src/sys/sys/diskmbr.h,v 1.4 2007/06/17 03:51:11 dillon Exp $
   36  */
   37 
   38 #ifndef _SYS_DISKMBR_H_
   39 #define _SYS_DISKMBR_H_
   40 
   41 #ifndef _SYS_TYPES_H_
   42 #include <sys/types.h>
   43 #endif
   44 #ifndef _SYS_IOCCOM_H_
   45 #include <sys/ioccom.h>
   46 #endif
   47 
   48 #define DOSBBSECTOR     0       /* DOS boot block relative sector number */
   49 #define DOSPARTOFF      446
   50 #define DOSPARTSIZE     16
   51 #define NDOSPART        4
   52 #define NEXTDOSPART     32
   53 #define DOSMAGICOFFSET  510
   54 #define DOSMAGIC        0xAA55
   55 
   56 #define DOSPTYP_386BSD  0xa5    /* 386BSD partition type */
   57 #define DOSPTYP_OPENBSD 0xa6    /* OpenBSD partition type */
   58 #define DOSPTYP_NETBSD  0xa9    /* NetBSD partition type */
   59 #define DOSPTYP_LINSWP  0x82    /* Linux swap partition */
   60 #define DOSPTYP_LINUX   0x83    /* Linux partition */
   61 #define DOSPTYP_PMBR    0xee    /* GPT Protective MBR */
   62 #define DOSPTYP_GPT     0xef    /* GPT Native EFI */
   63 #define DOSPTYP_EXT     5       /* DOS extended partition */
   64 #define DOSPTYP_EXTLBA  15      /* DOS extended partition */
   65 
   66 /*
   67  * Note that sector numbers in a legacy MBR DOS partition start at 1 instead
   68  * of 0, so the first sector of the disk would be cyl 0, head 0, sector 1
   69  * and translate to block 0 in the actual disk I/O.
   70  */
   71 struct dos_partition {
   72         unsigned char   dp_flag;        /* bootstrap flags */
   73         unsigned char   dp_shd;         /* starting head */
   74         unsigned char   dp_ssect;       /* starting sector */
   75         unsigned char   dp_scyl;        /* starting cylinder */
   76         unsigned char   dp_typ;         /* partition type */
   77         unsigned char   dp_ehd;         /* end head */
   78         unsigned char   dp_esect;       /* end sector */
   79         unsigned char   dp_ecyl;        /* end cylinder */
   80         u_int32_t       dp_start;       /* absolute starting sector number */
   81         u_int32_t       dp_size;        /* partition size in sectors */
   82 };
   83 #ifdef CTASSERT
   84 CTASSERT(sizeof (struct dos_partition) == DOSPARTSIZE);
   85 #endif
   86 
   87 #define DPSECT(s) ((s) & 0x3f)          /* isolate relevant bits of sector */
   88 #define DPCYL(c, s) ((c) + (((s) & 0xc0)<<2)) /* and those that are cylinder */
   89 
   90 #define DIOCSMBR        _IOW('M', 129, u_char[512])
   91 
   92 #endif /* !_SYS_DISKMBR_H_ */

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