/* * All the goo for PC ethernet cards. */typedef struct Card Card;typedef struct RingBuf RingBuf;typedef struct Type Type;typedef struct Ctlr Ctlr; /* * Hardware interface. */struct Card {	ISAConf; 	int	(*reset)(Ctlr*);	void	(*attach)(Ctlr*); 	void	*(*read)(Ctlr*, void*, ulong, ulong);	void	*(*write)(Ctlr*, ulong, void*, ulong); 	void	(*receive)(Ctlr*);	void	(*transmit)(Ctlr*);	void	(*intr)(Ureg*, Ctlr*);	void	(*overflow)(Ctlr*); 	uchar	bit16;			/* true if a 16 bit interface */	uchar	ram;			/* true if card has shared memory */ 	ulong	dp8390;			/* I/O address of 8390 (if any) */	ulong	data;			/* I/O data port if no shared memory */	uchar	nxtpkt;			/* software bndry */	uchar	tstart;			/* 8390 ring addresses */	uchar	pstart;	uchar	pstop; 	uchar	dummyrr;		/* do dummy remote read */}; /* * Software ring buffer. */struct RingBuf {	uchar	owner;	uchar	busy;			/* unused */	ushort	len;	uchar	pkt[sizeof(Etherpkt)];}; enum {	Host		= 0,		/* buffer owned by host */	Interface	= 1,		/* buffer owned by card */ 	Nrb		= 16,		/* default number of receive buffers */	Ntb		= 2,		/* default number of transmit buffers */}; /* * Software controller. */struct Ctlr {	Card	card;			/* hardware info */	int	ctlrno;	int	present; 	Queue*	iq;	Queue*	oq; 	int	inpackets;	int	outpackets;	int	crcs;			/* input crc errors */	int	oerrs;			/* output errors */	int	frames;			/* framing errors */	int	overflows;		/* packet overflows */	int	buffs;			/* buffering errors */}; #define NEXT(x, l)	(((x)+1)%(l))#define	HOWMANY(x, y)	(((x)+((y)-1))/(y))#define ROUNDUP(x, y)	(HOWMANY((x), (y))*(y)) extern int cs8900reset(Ctlr*);extern int	etheriq(Ctlr*, Block*, int);