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typedef struct RingBuf {
uchar owner;
uchar unused;
ushort len;
uchar pkt[sizeof(Etherpkt)];
} RingBuf;
enum {
Host = 0, /* buffer owned by host */
Interface = 1, /* buffer owned by card */
Nrb = 32, /* default number of receive buffers */
Ntb = 8, /* default number of transmit buffers */
};
typedef struct Ether Ether;
struct Ether {
ISAConf; /* hardware info */
int ctlrno;
int state; /* 0: unfound, 1: found, 2: attaching */
int tbdf;
void (*attach)(Ether*); /* filled in by reset routine */
void (*transmit)(Ether*);
void (*interrupt)(Ureg*, void*);
void (*detach)(Ether*);
void *ctlr;
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 mbps; /* zero means link down */
};
extern void etherrloop(Ether*, Etherpkt*, long);
extern void addethercard(char*, int(*)(Ether*));
#define NEXT(x, l) (((x)+1)%(l))
#define PREV(x, l) (((x) == 0) ? (l)-1: (x)-1)
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