e67a8f5058
git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@485 6ac86273-5f31-0410-b378-82cca8765d1b
93 lines
4.5 KiB
C
93 lines
4.5 KiB
C
/****************************************************************/
|
|
/* */
|
|
/* dcb.h */
|
|
/* */
|
|
/* DOS Device Control Block Structure */
|
|
/* */
|
|
/* November 20, 1991 */
|
|
/* */
|
|
/* Copyright (c) 1995 */
|
|
/* Pasquale J. Villani */
|
|
/* All Rights Reserved */
|
|
/* */
|
|
/* This file is part of DOS-C. */
|
|
/* */
|
|
/* DOS-C is free software; you can redistribute it and/or */
|
|
/* modify it under the terms of the GNU General Public License */
|
|
/* as published by the Free Software Foundation; either version */
|
|
/* 2, or (at your option) any later version. */
|
|
/* */
|
|
/* DOS-C is distributed in the hope that it will be useful, but */
|
|
/* WITHOUT ANY WARRANTY; without even the implied warranty of */
|
|
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See */
|
|
/* the GNU General Public License for more details. */
|
|
/* */
|
|
/* You should have received a copy of the GNU General Public */
|
|
/* License along with DOS-C; see the file COPYING. If not, */
|
|
/* write to the Free Software Foundation, 675 Mass Ave, */
|
|
/* Cambridge, MA 02139, USA. */
|
|
/****************************************************************/
|
|
|
|
#ifdef MAIN
|
|
#ifdef VERSION_STRINGS
|
|
static BYTE *clock_hRcsId =
|
|
"$Id$";
|
|
#endif
|
|
#endif
|
|
|
|
/* Internal drive parameter block */
|
|
struct dpb {
|
|
BYTE dpb_unit; /* unit for error reporting */
|
|
BYTE dpb_subunit; /* the sub-unit for driver */
|
|
UWORD dpb_secsize; /* sector size */
|
|
UBYTE dpb_clsmask; /* mask (sectors/cluster-1) */
|
|
UBYTE dpb_shftcnt; /* log base 2 of cluster size */
|
|
UWORD dpb_fatstrt; /* FAT start sector */
|
|
UBYTE dpb_fats; /* # of FAT copies */
|
|
UWORD dpb_dirents; /* # of dir entries */
|
|
UWORD dpb_data; /* start of data area */
|
|
UWORD dpb_size; /* # of clusters+1 on media */
|
|
UWORD dpb_fatsize; /* # of sectors / FAT */
|
|
UWORD dpb_dirstrt; /* start sec. of root dir */
|
|
struct dhdr FAR * /* pointer to device header */
|
|
dpb_device;
|
|
UBYTE dpb_mdb; /* media descr. byte */
|
|
BYTE dpb_flags; /* -1 = force MEDIA CHK */
|
|
struct dpb FAR * /* next dpb in chain */
|
|
dpb_next; /* -1 = end */
|
|
UWORD dpb_cluster; /* cluster # of first free */
|
|
/* -1 if not known */
|
|
#ifndef WITHFAT32
|
|
UWORD dpb_nfreeclst; /* number of free clusters */
|
|
/* -1 if not known */
|
|
#else
|
|
union {
|
|
struct {
|
|
UWORD dpb_nfreeclst_lo;
|
|
UWORD dpb_nfreeclst_hi;
|
|
} dpb_nfreeclst_st;
|
|
ULONG _dpb_xnfreeclst; /* number of free clusters */
|
|
/* -1 if not known */
|
|
} dpb_nfreeclst_un;
|
|
#define dpb_nfreeclst dpb_nfreeclst_un.dpb_nfreeclst_st.dpb_nfreeclst_lo
|
|
#define dpb_xnfreeclst dpb_nfreeclst_un._dpb_xnfreeclst
|
|
|
|
UWORD dpb_xflags; /* extended flags, see bpb */
|
|
UWORD dpb_xfsinfosec; /* FS info sector number, */
|
|
/* 0xFFFF if unknown */
|
|
UWORD dpb_xbackupsec; /* backup boot sector number */
|
|
/* 0xFFFF if unknown */
|
|
ULONG dpb_xdata;
|
|
ULONG dpb_xsize; /* # of clusters+1 on media */
|
|
ULONG dpb_xfatsize; /* # of sectors / FAT */
|
|
ULONG dpb_xrootclst; /* starting cluster of root dir */
|
|
ULONG dpb_xcluster; /* cluster # of first free */
|
|
/* -1 if not known */
|
|
#endif
|
|
};
|
|
|
|
#define UNKNCLUSTER 0x0000 /* see RBIL INT 21/AH=52 entry */
|
|
#define XUNKNCLSTFREE 0xffffffffl /* unknown for DOS */
|
|
#define UNKNCLSTFREE 0xffff /* unknown for DOS */
|
|
|