etherif.h

著名操作系统Plan 9的第三版的部分核心源代码。现在很难找到了。Plan 9是bell实验室开发的Unix后继者。

enum {
	MaxEther	= 24,
	Ntypes		= 8,
};

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

	int	ctlrno;
	int	tbdf;			/* type+busno+devno+funcno */
	int	mbps;			/* Mbps */
	uchar	ea[Eaddrlen];

	void	(*attach)(Ether*);	/* filled in by reset routine */
	void	(*transmit)(Ether*);
	void	(*interrupt)(Ureg*, void*);
	long	(*ifstat)(Ether*, void*, long, ulong);
	void	*ctlr;

	Queue*	oq;

	Netif;
};

extern Block* etheriq(Ether*, Block*, int);
extern void addethercard(char*, int(*)(Ether*));
extern ulong ethercrc(uchar*, int);

#define NEXT(x, l)	(((x)+1)%(l))
#define PREV(x, l)	(((x) == 0) ? (l)-1: (x)-1)
#define	HOWMANY(x, y)	(((x)+((y)-1))/(y))
#define ROUNDUP(x, y)	(HOWMANY((x), (y))*(y))