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WebSVN – planix.SVN – Blame – /os/branches/feature_tlsv12/sys/src/boot/pc/dosfs.h – Rev 2

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