/* * Storage Device. */typedef struct SDev SDev;typedef struct SDifc SDifc;typedef struct SDpart SDpart;typedef struct SDreq SDreq;typedef struct SDunit SDunit; typedef struct SDpart {	uvlong	start;	uvlong	end;	char	name[NAMELEN];	char	user[NAMELEN];	ulong	perm;	int	valid;	void	*crud;} SDpart; typedef struct SDunit {	SDev*	dev;	int	subno;	uchar	inquiry[256];		/* format follows SCSI spec */	char	name[NAMELEN];//	Rendez	rendez; //	QLock	ctl;	uvlong	sectors;	ulong	secsize;	SDpart*	part;	int	npart;			/* of valid partitions */	int	changed; //	QLock	raw;	int	state;	SDreq*	req;} SDunit; typedef struct SDev {	SDifc*	ifc;			/* pnp/legacy */	void	*ctlr;	int	idno;	int	index;			/* into unit space */	int	nunit;	SDev*	next; //	QLock;				/* enable/disable */	int	enabled;} SDev; typedef struct SDifc {	char*	name; 	SDev*	(*pnp)(void);	SDev*	(*legacy)(int, int);	SDev*	(*id)(SDev*);	int	(*enable)(SDev*);	int	(*disable)(SDev*); 	int	(*verify)(SDunit*);	int	(*online)(SDunit*);	int	(*rio)(SDreq*);	int	(*rctl)(SDunit*, char*, int);	int	(*wctl)(SDunit*, void*); 	long	(*bio)(SDunit*, int, int, void*, long, uvlong);} SDifc; typedef struct SDreq {	SDunit*	unit;	int	lun;	int	write;	uchar	cmd[16];	int	clen;	void*	data;	int	dlen; 	int	flags; 	int	status;	long	rlen;	uchar	sense[256];} SDreq; enum {	SDnosense	= 0x00000001,	SDvalidsense	= 0x00010000,}; enum {	SDretry		= -5,		/* internal to controllers */	SDmalloc	= -4,	SDeio		= -3,	SDtimeout	= -2,	SDnostatus	= -1, 	SDok		= 0, 	SDcheck		= 0x02,		/* check condition */	SDbusy		= 0x08,		/* busy */ 	SDread	= 0,	SDwrite, 	SDmaxio		= 2048*1024,	SDnpart		= 16,}; /* sdscsi.c */extern int scsiverify(SDunit*);extern int scsionline(SDunit*);extern long scsibio(SDunit*, int, int, void*, long, uvlong);extern SDev* scsiid(SDev*, SDifc*); #define IrqATA0 14#define IrqATA1 15#define qlock(i)	while(0)#define qunlock(i)	while(0) #define putstrn consputs void	sleep(void*, int(*)(void*), void*);void	tsleep(void*, int(*)(void*), void*, int);#define wakeup(x) while(0)long	sdbio(SDunit *unit, SDpart *pp, void *a, long len, uvlong off);void	partition(SDunit*);SDpart* sdfindpart(SDunit*, char*);void	sdaddpart(SDunit*, char*, uvlong, uvlong);void*	sdmalloc(void*, ulong);