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  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)disklabel.h 8.2 (Berkeley) 7/10/94
   30  * $FreeBSD$
   31  */
   32 
   33 #ifndef _SYS_DISKMBR_H_
   34 #define _SYS_DISKMBR_H_
   35 
   36 #include <sys/ioccom.h>
   37 
   38 #define DOSBBSECTOR     0       /* DOS boot block relative sector number */
   39 #define DOSPARTOFF      446
   40 #define DOSPARTSIZE     16
   41 #define NDOSPART        4
   42 #define NEXTDOSPART     32
   43 #define DOSMAGICOFFSET  510
   44 #define DOSMAGIC        0xAA55
   45 
   46 #define DOSPTYP_386BSD  0xa5    /* 386BSD partition type */
   47 #define DOSPTYP_LINSWP  0x82    /* Linux swap partition */
   48 #define DOSPTYP_LINUX   0x83    /* Linux partition */
   49 #define DOSPTYP_PMBR    0xee    /* GPT Protective MBR */
   50 #define DOSPTYP_EXT     5       /* DOS extended partition */
   51 #define DOSPTYP_EXTLBA  15      /* DOS extended partition */
   52 
   53 struct dos_partition {
   54         unsigned char   dp_flag;        /* bootstrap flags */
   55         unsigned char   dp_shd;         /* starting head */
   56         unsigned char   dp_ssect;       /* starting sector */
   57         unsigned char   dp_scyl;        /* starting cylinder */
   58         unsigned char   dp_typ;         /* partition type */
   59         unsigned char   dp_ehd;         /* end head */
   60         unsigned char   dp_esect;       /* end sector */
   61         unsigned char   dp_ecyl;        /* end cylinder */
   62         u_int32_t       dp_start;       /* absolute starting sector number */
   63         u_int32_t       dp_size;        /* partition size in sectors */
   64 };
   65 #ifdef CTASSERT
   66 CTASSERT(sizeof (struct dos_partition) == DOSPARTSIZE);
   67 #endif
   68 
   69 void dos_partition_dec(void const *pp, struct dos_partition *d);
   70 void dos_partition_enc(void *pp, struct dos_partition *d);
   71 
   72 #define DPSECT(s) ((s) & 0x3f)          /* isolate relevant bits of sector */
   73 #define DPCYL(c, s) ((c) + (((s) & 0xc0)<<2)) /* and those that are cylinder */
   74 
   75 #define DIOCSMBR        _IOW('M', 129, u_char[512])
   76 
   77 #endif /* !_SYS_DISKMBR_H_ */

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