b857858f48
git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@7 6ac86273-5f31-0410-b378-82cca8765d1b
110 lines
4.5 KiB
C
110 lines
4.5 KiB
C
/****************************************************************/
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/* */
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/* dcb.h */
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/* */
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/* DOS Device Control Block Structure */
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/* */
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/* November 20, 1991 */
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/* */
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/* Copyright (c) 1995 */
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/* Pasquale J. Villani */
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/* All Rights Reserved */
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/* */
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/* This file is part of DOS-C. */
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/* */
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/* DOS-C is free software; you can redistribute it and/or */
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/* modify it under the terms of the GNU General Public License */
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/* as published by the Free Software Foundation; either version */
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/* 2, or (at your option) any later version. */
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/* */
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/* DOS-C is distributed in the hope that it will be useful, but */
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/* WITHOUT ANY WARRANTY; without even the implied warranty of */
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/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See */
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/* the GNU General Public License for more details. */
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/* */
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/* You should have received a copy of the GNU General Public */
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/* License along with DOS-C; see the file COPYING. If not, */
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/* write to the Free Software Foundation, 675 Mass Ave, */
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/* Cambridge, MA 02139, USA. */
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/****************************************************************/
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#ifdef MAIN
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#ifdef VERSION_STRINGS
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static BYTE *clock_hRcsId = "$Id$";
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#endif
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#endif
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/*
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* $Log$
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* Revision 1.2 2000/05/08 04:28:22 jimtabor
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* Update CVS to 2020
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*
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* Revision 1.3 2000/03/09 06:06:38 kernel
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* 2017f updates by James Tabor
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*
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* Revision 1.2 1999/04/16 00:52:09 jprice
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* Optimized FAT handling
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*
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* Revision 1.1.1.1 1999/03/29 15:39:23 jprice
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* New version without IPL.SYS
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*
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* Revision 1.3 1999/02/01 01:40:06 jprice
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* Clean up
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*
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* Revision 1.2 1999/01/22 04:17:40 jprice
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* Formating
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*
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* Revision 1.1.1.1 1999/01/20 05:51:01 jprice
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* Imported sources
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*
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*
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* Rev 1.5 04 Jan 1998 23:14:18 patv
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* Changed Log for strip utility
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*
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* Rev 1.4 29 May 1996 21:25:20 patv
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* bug fixes for v0.91a
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*
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* Rev 1.3 19 Feb 1996 3:15:30 patv
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* Added NLS, int2f and config.sys processing
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*
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* Rev 1.2 01 Sep 1995 17:35:40 patv
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* First GPL release.
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*
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* Rev 1.1 30 Jul 1995 20:43:48 patv
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* Eliminated version strings in ipl
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*
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* Rev 1.0 02 Jul 1995 10:39:30 patv
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* Initial revision.
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*/
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/* Internal drive parameter block */
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struct dpb
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{
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BYTE dpb_unit; /* unit for error reporting */
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BYTE dpb_subunit; /* the sub-unit for driver */
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UWORD dpb_secsize; /* sector size */
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UBYTE dpb_clsmask; /* mask (sectors/cluster-1) */
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UBYTE dpb_shftcnt; /* log base 2 of cluster size */
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UWORD dpb_fatstrt; /* FAT start sector */
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UBYTE dpb_fats; /* # of FAT copies */
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UWORD dpb_dirents; /* # of dir entries */
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UWORD dpb_data; /* start of data area */
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UWORD dpb_size; /* # of clusters+1 on media */
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UWORD dpb_fatsize; /* # of sectors / FAT */
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UWORD dpb_dirstrt; /* start sec. of root dir */
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struct dhdr FAR * /* pointer to device header */
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dpb_device;
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UBYTE dpb_mdb; /* media descr. byte */
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BYTE dpb_flags; /* -1 = force MEDIA CHK */
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struct dpb FAR * /* next dpb in chain */
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dpb_next; /* -1 = end */
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UWORD dpb_cluster; /* cluster # of first free */
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/* -1 if not known */
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UWORD dpb_nfreeclst; /* number of free clusters */
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/* -1 if not known */
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};
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#define UNKNCLUSTER 0xffff /* 0xffff = unknown for DOS */
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