From 7efbb964fdff1348e01bdcd7d4bb59551c389bef Mon Sep 17 00:00:00 2001
From: dfr <dfr@FreeBSD.org>
Date: Mon, 19 Sep 1994 15:41:57 +0000
Subject: Added msdosfs.

Obtained from: NetBSD
---
 sys/msdosfs/bpb.h | 120 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 sys/msdosfs/bpb.h

(limited to 'sys/msdosfs/bpb.h')

diff --git a/sys/msdosfs/bpb.h b/sys/msdosfs/bpb.h
new file mode 100644
index 0000000..70e4de2
--- /dev/null
+++ b/sys/msdosfs/bpb.h
@@ -0,0 +1,120 @@
+/*	$Id$ */
+/*	$NetBSD: bpb.h,v 1.3 1994/06/29 06:35:29 cgd Exp $	*/
+
+/*
+ * 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
+ */
+
+/*
+ * BIOS Parameter Block (BPB) for DOS 3.3
+ */
+struct bpb33 {
+	u_short bpbBytesPerSec;	/* bytes per sector */
+	u_char bpbSecPerClust;	/* sectors per cluster */
+	u_short bpbResSectors;	/* number of reserved sectors */
+	u_char bpbFATs;		/* number of FATs */
+	u_short bpbRootDirEnts;	/* number of root directory entries */
+	u_short bpbSectors;	/* total number of sectors */
+	u_char bpbMedia;	/* media descriptor */
+	u_short bpbFATsecs;	/* number of sectors per FAT */
+	u_short bpbSecPerTrack;	/* sectors per track */
+	u_short bpbHeads;	/* number of heads */
+	u_short bpbHiddenSecs;	/* number of hidden sectors */
+};
+
+/*
+ * BPB for DOS 5.0 The difference is bpbHiddenSecs is a short for DOS 3.3,
+ * and bpbHugeSectors is not in the 3.3 bpb.
+ */
+struct bpb50 {
+	u_short bpbBytesPerSec;	/* bytes per sector */
+	u_char bpbSecPerClust;	/* sectors per cluster */
+	u_short bpbResSectors;	/* number of reserved sectors */
+	u_char bpbFATs;		/* number of FATs */
+	u_short bpbRootDirEnts;	/* number of root directory entries */
+	u_short bpbSectors;	/* total number of sectors */
+	u_char bpbMedia;	/* media descriptor */
+	u_short bpbFATsecs;	/* number of sectors per FAT */
+	u_short bpbSecPerTrack;	/* sectors per track */
+	u_short bpbHeads;	/* number of heads */
+	u_long bpbHiddenSecs;	/* number of hidden sectors */
+	u_long bpbHugeSectors;	/* number of sectrs if bpbSectors == 0 */
+};
+
+/*
+ * The following structures represent how the bpb's look on disk.  shorts
+ * and longs are just character arrays of the appropriate length.  This is
+ * because the compiler forces shorts and longs to align on word or
+ * halfword boundaries.
+ *
+ * XXX The little-endian code here assumes that the processor can access
+ * 16-bit and 32-bit quantities on byte boundaries.  If this is not true,
+ * use the macros for the big-endian case.
+ */
+#include <machine/endian.h>
+#if BYTE_ORDER == LITTLE_ENDIAN		/* && can do unaligned accesses */
+#define	getushort(x)	*((u_short *)(x))
+#define	getulong(x)	*((u_long *)(x))
+#define	putushort(p, v)	(*((u_short *)(p)) = (v))
+#define	putulong(p, v)	(*((u_long *)(p)) = (v))
+
+#else
+#define getushort(x)	(((u_char *)(x))[0] + (((u_char *)(x))[1] << 8))
+#define getulong(x)	(((u_char *)(x))[0] + (((u_char *)(x))[1] << 8) \
+			 + (((u_char *)(x))[2] << 16)	\
+			 + (((u_char *)(x))[3] << 24))
+#define putushort(p, v)	(((u_char *)(p))[0] = (v),	\
+			 ((u_char *)(p))[1] = (v) >> 8)
+#define putulong(p, v)	(((u_char *)(p))[0] = (v),	\
+			 ((u_char *)(p))[1] = (v) >> 8, \
+			 ((u_char *)(p))[2] = (v) >> 16,\
+			 ((u_char *)(p))[3] = (v) >> 24)
+#endif
+
+/*
+ * BIOS Parameter Block (BPB) for DOS 3.3
+ */
+struct byte_bpb33 {
+	char bpbBytesPerSec[2];	/* bytes per sector */
+	char bpbSecPerClust;	/* sectors per cluster */
+	char bpbResSectors[2];	/* number of reserved sectors */
+	char bpbFATs;		/* number of FATs */
+	char bpbRootDirEnts[2];	/* number of root directory entries */
+	char bpbSectors[2];	/* total number of sectors */
+	char bpbMedia;		/* media descriptor */
+	char bpbFATsecs[2];	/* number of sectors per FAT */
+	char bpbSecPerTrack[2];	/* sectors per track */
+	char bpbHeads[2];	/* number of heads */
+	char bpbHiddenSecs[2];	/* number of hidden sectors */
+};
+
+/*
+ * BPB for DOS 5.0 The difference is bpbHiddenSecs is a short for DOS 3.3,
+ * and bpbHugeSectors is not in the 3.3 bpb.
+ */
+struct byte_bpb50 {
+	char bpbBytesPerSec[2];	/* bytes per sector */
+	char bpbSecPerClust;	/* sectors per cluster */
+	char bpbResSectors[2];	/* number of reserved sectors */
+	char bpbFATs;		/* number of FATs */
+	char bpbRootDirEnts[2];	/* number of root directory entries */
+	char bpbSectors[2];	/* total number of sectors */
+	char bpbMedia;		/* media descriptor */
+	char bpbFATsecs[2];	/* number of sectors per FAT */
+	char bpbSecPerTrack[2];	/* sectors per track */
+	char bpbHeads[2];	/* number of heads */
+	char bpbHiddenSecs[4];	/* number of hidden sectors */
+	char bpbHugeSectors[4];	/* number of sectrs if bpbSectors == 0 */
+};
-- 
cgit v1.1