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enum
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{
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	MaxEther	= 4,
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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;
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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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	Netif;
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	void	(*attach)(Ether*);	/* filled in by reset routine */
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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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	uchar	ea[Eaddrlen];
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	void*	address;
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	int	irq;
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	Queue*	oq;
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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)