/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ typedef struct Dosboot	Dosboot;typedef struct Dos	Dos;typedef struct Dosdir	Dosdir;typedef struct Dosfile	Dosfile;typedef struct Dospart	Dospart;typedef struct File File;typedef struct Bootfs Bootfs; int fsread(File *file, void *a, long n);int fsboot(Bootfs *fs, char *path, Boot *b);int fswalk(Bootfs *fs, char *path, File *f); 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;}; typedef struct Dosboot Dosboot;typedef struct Dosdir Dosdir; struct Dosboot{	uchar	magic[3];	uchar	version[8];	uchar	sectsize[2];	uchar	clustsize;	uchar	nresrv[2];	uchar	nfats;	uchar	rootsize[2];	uchar	volsize[2];	uchar	mediadesc;	uchar	fatsize[2];	uchar	trksize[2];	uchar	nheads[2];	uchar	nhidden[4];	uchar	bigvolsize[4];/* fat 32 */	uchar	bigfatsize[4];	uchar	extflags[2];	uchar	fsversion[2];	uchar	rootdirstartclust[4];	uchar	fsinfosect[2];	uchar	backupbootsect[2];/* ???	uchar	driveno;	uchar	reserved0;	uchar	bootsig;	uchar	volid[4];	uchar	label[11];	uchar	reserved1[8];*/}; struct Dosdir{	uchar	name[8];	uchar	ext[3];	uchar	attr;	uchar	lowercase;	uchar	hundredth;	uchar	ctime[2];	uchar	cdate[2];	uchar	adate[2];	uchar	highstart[2];	uchar	mtime[2];	uchar	mdate[2];	uchar	start[2];	uchar	length[4];}; #define	DOSRONLY	0x01#define	DOSHIDDEN	0x02#define	DOSSYSTEM	0x04#define	DOSVLABEL	0x08#define	DOSDIR	0x10#define	DOSARCH	0x20 // #pragma incomplete Bootfs struct File{	union{		Dosfile	dos;		int walked;	};	Bootfs	*fs;	char	*path;}; struct Bootfs{	union {		Dos dos;	};	Chan	*devch;	char	*disk; 	/* for *bios.c */	int	dev;				/* device id */	long	(*diskread)(Bootfs*, void*, long);	/* disk read routine */	vlong	(*diskseek)(Bootfs*, vlong);	/* disk seek routine */ 	long	(*read)(File*, void*, long);	int	(*walk)(File*, char*);	File	root;}; extern int	dosinit(Bootfs*, char *); #define BADPTR(x) ((ulong)(x) < 0x80000000)