/* * 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;}; /* * 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		= 1,		/* default number of transmit buffers */}; /* * Software controller. */struct Ctlr {	Card	card;			/* hardware info */	int	ctlrno;	char	iname[NAMELEN];	char	oname[NAMELEN];	int	present; 	ushort	nrb;			/* number of software receive buffers */	ushort	ntb;			/* number of software transmit buffers */	RingBuf *rb;			/* software receive buffers */	RingBuf *tb;			/* software transmit buffers */ 	ushort	rh;			/* first receive buffer belonging to host */	ushort	ri;			/* first receive buffer belonging to card */	 	ushort	th;			/* first transmit buffer belonging to host */		ushort	ti;			/* first transmit buffer belonging to card */	int	tbusy;			/* transmitter is busy */	 	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)) /* * The Western Digital 8003 and 8013 series, the NE2000 * and the 3Com 503 all use the DP8390 Network Interface * Chip. */extern void dp8390reset(Ctlr*);extern void dp8390attach(Ctlr*);extern void dp8390mode(Ctlr*, int);extern void dp8390getea(Ctlr*);extern void dp8390setea(Ctlr*);extern void *dp8390read(Ctlr*, void*, ulong, ulong);extern void *dp8390write(Ctlr*, ulong, void*, ulong);extern void dp8390receive(Ctlr*);extern void dp8390transmit(Ctlr*);extern void dp8390intr(Ureg*, Ctlr*);extern void dp8390overflow(Ctlr*); /* * The DP8390 needs some time between successive  * chip selects, so we need special I/O routines. * See l.s. * These routines only need to be used for accessing * the chip registers. Data I/O, either through * remote DMA or shared memory, can use the normal * routines. */extern int dp8390inb(ulong);extern void dp8390outb(ulong, uchar); enum {	Dp8390BufSz	= 256,		/* hardware ring buffer size */}; extern int ne2000reset(Ctlr*);extern int ne3210reset(Ctlr*);extern int tcm509reset(Ctlr*);extern int wd8003reset(Ctlr*);