/*  * 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. */ /* * mass storage transport protocols and subclasses, * from usb mass storage class specification overview rev 1.2 */ typedef struct Umsc Umsc;typedef struct Ums Ums;typedef struct Cbw Cbw;			/* command block wrapper */typedef struct Csw Csw;			/* command status wrapper */ enum{	Protocbi =	0,	/* control/bulk/interrupt; mainly floppies */	Protocb =	1,	/*   "  with no interrupt; mainly floppies */	Protobulk =	0x50,	/* bulk only */ 	Subrbc =	1,	/* reduced blk cmds */	Subatapi =	2,	/* cd/dvd using sff-8020i or mmc-2 cmd blks */	Subqic 	=	3,	/* QIC-157 tapes */	Subufi =	4,	/* floppy */	Sub8070 =	5,	/* removable media, atapi-like */	Subscsi =	6,	/* scsi transparent cmd set */	Subisd200 =	7,	/* ISD200 ATA */	Subdev =	0xff,	/* use device's value */ 	Umsreset =	0xFF,	Getmaxlun =	0xFE, //	Maxlun		= 256,	Maxlun		= 32, 	CMreset = 1, 	Pcmd = 0,	Pdata,	Pstatus, 	CbwLen		= 31,	CbwDataIn	= 0x80,	CbwDataOut	= 0x00,	CswLen		= 13,	CswOk		= 0,	CswFailed	= 1,	CswPhaseErr	= 2,}; /* * corresponds to a lun. * these are ~600+Maxiosize bytes each; ScsiReq is not tiny. */struct Umsc{	ScsiReq;	uvlong	blocks;	vlong	capacity; 	/* from setup */	char	*bufp;	long	off;		/* offset within a block */	long	nb;		/* byte count */ 	uchar 	rawcmd[16];	uchar	phase;	char	*inq;	Ums	*ums;	Usbfs	fs;	char	buf[Maxiosize];}; struct Ums{	QLock;	Dev	*dev;	Dev	*epin;	Dev	*epout;	Umsc	*lun;	uchar	maxlun;	int	seq;	int	nerrs;	int	wrongresidues;}; /* * USB transparent SCSI devices */struct Cbw{	char	signature[4];		/* "USBC" */	long	tag;	long	datalen;	uchar	flags;	uchar	lun;	uchar	len;	char	command[16];}; struct Csw{	char	signature[4];		/* "USBS" */	long	tag;	long	dataresidue;	uchar	status;};  int	diskmain(Dev*, int, char**);