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2 - 1 
enum
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{
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	MaxEther	= 2,
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	Ntypes		= 8,
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};
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typedef struct Ether Ether;
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struct Ether {
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	RWlock;				/* TO DO */
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	ISAConf;			/* hardware info */
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	int	ctlrno;
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	int	minmtu;
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	int	maxmtu;
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	uchar	ea[Eaddrlen];
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	void	*address;
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	int	tbusy;
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	void	(*attach)(Ether*);	/* filled in by reset routine */
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	void	(*closed)(Ether*);
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	void	(*detach)(Ether*);
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	void	(*transmit)(Ether*);
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	void	(*interrupt)(Ureg*, void*);
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	long	(*ifstat)(Ether*, void*, long, ulong);
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	long	(*ctl)(Ether*, void*, long); /* custom ctl messages */
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	void	(*power)(Ether*, int);	/* power on/off */
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	void	(*shutdown)(Ether*);	/* shutdown hardware before reboot */
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	void	*ctlr;
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	int	pcmslot;		/* PCMCIA */
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	int	fullduplex;		/* non-zero if full duplex */
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	int	linkchg;		/* link status changed? */
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	uvlong	starttime;		/* last activity time */
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	Queue*	oq;
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	/* statistics */
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	ulong	interrupts;
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	ulong	dmarxintr;
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	ulong	dmatxintr;
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	ulong	promisc;
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	ulong	pktsdropped;
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	ulong	pktsmisaligned;
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	ulong	resets;			/* after initialisation */
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	ulong	bcasts;			/* broadcast pkts rcv'd */
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	ulong	mcasts;			/* multicast pkts rcv'd */
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	Netif;
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};
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extern Block* etheriq(Ether*, Block*, int);
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extern void addethercard(char*, int(*)(Ether*));
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extern ulong ethercrc(uchar*, int);
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extern int parseether(uchar*, char*);
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#define NEXT(x, l)	(((x)+1)%(l))
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#define PREV(x, l)	(((x) == 0) ? (l)-1: (x)-1)