enum {
	MaxEther	= 4,
	Ntypes		= 8,
};

typedef struct Ether Ether;
struct Ether {
	ISAConf;			/* hardware info */

	void	(*attach)(Ether*);	/* filled in by reset routine */
	long	(*write)(Ether*, void*, long);
	void	(*interrupt)(Ether*);
	void	*private;

	Etherpkt tpkt;			/* transmit buffer */
	Etherpkt rpkt;			/* receive buffer */

	QLock	tlock;			/* lock for grabbing transmitter queue */
	Rendez	tr;			/* wait here for free xmit buffer */
	long	tlen;			/* length of data in tb for txfifo management */

	Netif;
};

#define NEXT(x, l)	(((x)+1)%(l))
#define	HOWMANY(x, y)	(((x)+((y)-1))/(y))
#define ROUNDUP(x, y)	(HOWMANY((x), (y))*(y))

extern void addethercard(char*, int(*)(Ether*));