sys/sys/diskmbr.h

   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_LINSWP  0x82    /* Linux swap partition */
  58 #define DOSPTYP_LINUX   0x83    /* Linux partition */
  59 #define DOSPTYP_PMBR    0xee    /* GPT Protective MBR */
  60 #define DOSPTYP_GPT     0xef    /* GPT Native EFI */
  61 #define DOSPTYP_EXT     5       /* DOS extended partition */
  62 #define DOSPTYP_EXTLBA  15      /* DOS extended partition */
  63
  64 /*
  65  * Note that sector numbers in a legacy MBR DOS partition start at 1 instead
  66  * of 0, so the first sector of the disk would be cyl 0, head 0, sector 1
  67  * and translate to block 0 in the actual disk I/O.
  68  */
  69 struct dos_partition {
  70         unsigned char   dp_flag;        /* bootstrap flags */
  71         unsigned char   dp_shd;         /* starting head */
  72         unsigned char   dp_ssect;       /* starting sector */
  73         unsigned char   dp_scyl;        /* starting cylinder */
  74         unsigned char   dp_typ;         /* partition type */
  75         unsigned char   dp_ehd;         /* end head */
  76         unsigned char   dp_esect;       /* end sector */
  77         unsigned char   dp_ecyl;        /* end cylinder */
  78         u_int32_t       dp_start;       /* absolute starting sector number */
  79         u_int32_t       dp_size;        /* partition size in sectors */
  80 };
  81 #ifdef CTASSERT
  82 CTASSERT(sizeof (struct dos_partition) == DOSPARTSIZE);
  83 #endif
  84
  85 #define DPSECT(s) ((s) & 0x3f)          /* isolate relevant bits of sector */
  86 #define DPCYL(c, s) ((c) + (((s) & 0xc0)<<2)) /* and those that are cylinder */
  87
  88 #define DIOCSMBR        _IOW('M', 129, u_char[512])
  89
  90 #endif /* !_SYS_DISKMBR_H_ */