Add diclaimer of copyright to _osname() manual page.

[unix-history] / sys / fs / msdosfs / bootsect.h

/*
* Written by Paul Popelka (paulp@uts.amdahl.com)
* 
* You can do anything you want with this software, just don't say you wrote
* it, and don't remove this notice.
* 
* This software is provided "as is".
* 
* The author supplies this software to be publicly redistributed on the
* understanding that the author is not responsible for the correct
* functioning of this software in any circumstances and is not liable for
* any damages caused by this software.
* 
* October 1992
* 
*      from NetBSD:    bootsect.h,v 1.3 1993/12/01 22:42:29 cgd Exp
*      $Id$
*/

/*
* Format of a boot sector.  This is the first sector on a DOS floppy disk
* or the fist sector of a partition on a hard disk.  But, it is not the
* first sector of a partitioned hard disk.
*/
struct bootsector33 {
       u_char bsJump[3];       /* jump instruction E9xxxx or EBxx90 */
       char bsOemName[8];      /* OEM name and version */
       char bsBPB[19];         /* BIOS parameter block */
       char bsDriveNumber;     /* drive number (0x80) */
       char bsBootCode[474];   /* pad so structure is 512 bytes long */
       u_short bsBootSectSig;
#define BOOTSIG 0xaa55
};

struct bootsector50 {
       u_char bsJump[3];       /* jump instruction E9xxxx or EBxx90 */
       char bsOemName[8];      /* OEM name and version */
       char bsBPB[25];         /* BIOS parameter block */
       char bsDriveNumber;     /* drive number (0x80) */
       char bsReserved1;       /* reserved */
       char bsBootSignature;   /* extended boot signature (0x29) */
#define EXBOOTSIG       0x29
       char bsVolumeID[4];     /* volume ID number */
       char bsVolumeLabel[11]; /* volume label */
       char bsFileSysType[8];  /* file system type (FAT12 or FAT16) */
       char bsBootCode[448];   /* pad so structure is 512 bytes long */
       u_short bsBootSectSig;
#define BOOTSIG 0xaa55
};

union bootsector {
       struct bootsector33 bs33;
       struct bootsector50 bs50;
};

/*
* Shorthand for fields in the bpb.
*/
#define bsBytesPerSec   bsBPB.bpbBytesPerSec
#define bsSectPerClust  bsBPB.bpbSectPerClust
#define bsResSectors    bsBPB.bpbResSectors
#define bsFATS          bsBPB.bpbFATS
#define bsRootDirEnts   bsBPB.bpbRootDirEnts
#define bsSectors       bsBPB.bpbSectors
#define bsMedia         bsBPB.bpbMedia
#define bsFATsecs       bsBPB.bpbFATsecs
#define bsSectPerTrack  bsBPB.bpbSectPerTrack
#define bsHeads         bsBPB.bpbHeads
#define bsHiddenSecs    bsBPB.bpbHiddenSecs
#define bsHugeSectors   bsBPB.bpbHugeSectors