20060303

1 files changed, 62 insertions, 0 deletions

diff --git a/os/boot/pc/dosfs.h b/os/boot/pc/dosfs.h
new file mode 100644
index 00000000..1107c4ce
--- /dev/null
+++ b/os/boot/pc/dosfs.h
@@ -0,0 +1,62 @@
+typedef struct Dosboot	Dosboot;
+typedef struct Dos	Dos;
+typedef struct Dosdir	Dosdir;
+typedef struct Dosfile	Dosfile;
+typedef struct Dospart	Dospart;
+
+struct Dospart
+{
+	uchar flag;		/* active flag */
+	uchar shead;		/* starting head */
+	uchar scs[2];		/* starting cylinder/sector */
+	uchar type;		/* partition type */
+	uchar ehead;		/* ending head */
+	uchar ecs[2];		/* ending cylinder/sector */
+	uchar start[4];		/* starting sector */
+	uchar len[4];		/* length in sectors */
+};
+
+#define FAT12	0x01
+#define FAT16	0x04
+#define EXTEND	0x05
+#define FATHUGE	0x06
+#define FAT32	0x0b
+#define FAT32X	0x0c
+#define EXTHUGE	0x0f
+#define DMDDO	0x54
+#define PLAN9	0x39
+#define LEXTEND 0x85
+
+struct Dosfile{
+	Dos	*dos;		/* owning dos file system */
+	char	name[8];
+	char	ext[3];
+	uchar	attr;
+	long	length;
+	long	pstart;		/* physical start cluster address */
+	long	pcurrent;	/* physical current cluster address */
+	long	lcurrent;	/* logical current cluster address */
+	long	offset;
+};
+
+struct Dos{
+	long	start;		/* start of file system */
+	int	sectsize;	/* in bytes */
+	int	clustsize;	/* in sectors */
+	int	clustbytes;	/* in bytes */
+	int	nresrv;		/* sectors */
+	int	nfats;		/* usually 2 */
+	int	rootsize;	/* number of entries */
+	int	volsize;	/* in sectors */
+	int	mediadesc;
+	int	fatsize;	/* in sectors */
+	int	fatclusters;
+	int	fatbits;	/* 12 or 16 */
+	long	fataddr;	/* sector number */
+	long	rootaddr;
+	long	rootclust;
+	long	dataaddr;
+	long	freeptr;
+};
+
+extern int	dosinit(Fs*);