sc);
sc, sc->sc_dev.dv_xname);
struct mbuf *elget __P((struct el_softc *sc, int));static inline void el_hardreset __P((struct el_softc *));int elprobe __P((struct device *, void *, void *));void elattach __P((struct device *, struct device *, void *));/* isa_driver structure for autoconf */struct cfdriver elcd = {	NULL, "el", elprobe, elattach, DV_IFNET, sizeof(struct el_softc)};/* * Probe routine. * * See if the card is there and at the right place. * (XXX - cgd -- needs help) */intelprobe(parent, match, aux)	struct device *parent;	void *match, *aux;{	struct el_softc *sc = match;	struct isa_attach_args *ia = aux;	int iobase = ia->ia_iobase;	u_char station_addr[ETHER_ADDR_LEN];	int i;	/* First check the base. */	if (iobase < 0x280 || iobase > 0x3f0)		return 0;	/* Grab some info for our structure. */	sc->sc_iobase = iobase;	/*	 * Now attempt to grab the station address from the PROM and see if it	 * contains the 3com vendor code.	 */	dprintf(("Probing 3c501 at 0x%x...\n", iobase));	/* Reset the board. */	dprintf(("Resetting board...\n"));	outb(iobase+EL_AC, EL_AC_RESET);	delay(5);	outb(iobase+EL_AC, 0);	/* Now read the address. */	dprintf(("Reading station address...\n"));	for (i = 0; i < ETHER_ADDR_LEN; i++) {		outb(iobase+EL_GPBL, i);		station_addr[i] = inb(iobase+EL_EAW);	}	dprintf(("Address is %s\n", ether_sprintf(station_addr)));	/*	 * If the vendor code is ok, return a 1.  We'll assume that whoever	 * configured this system is right about the IRQ.	 */	if (station_addr[0] != 0x02 || station_addr[1] != 0x60 ||	    station_addr[2] != 0x8c) {		dprintf(("Bad vendor code.\n"));		return 0;	}	dprintf(("Vendor code ok.\n"));	/* Copy the station address into the arpcom structure. */	bcopy(station_addr, sc->sc_arpcom.ac_enaddr, ETHER_ADDR_LEN);	ia->ia_iosize = 4;	/* XXX */	ia->ia_msize = 0;	return 1;}/* * Attach the interface to the kernel data structures.  By the time this is * called, we know that the card exists at the given I/O address.  We still * assume that the IRQ given is correct. */voidelattach(parent, self, aux)	struct device *parent, *self;	void *aux;{	struct el_softc *sc = (void *)self;	struct isa_attach_args *ia = aux;	struct ifnet *ifp = &sc->sc_arpcom.ac_if;	dprintf(("Attaching %s...\n", sc->sc_dev.dv_xname));	/* Stop the board. */	elstop(sc);	/* Initialize ifnet structure. */	ifp->if_unit = sc->sc_dev.dv_unit;	ifp->if_name = elcd.cd_name;	ifp->if_start = elstart;	ifp->if_ioctl = elioctl;	ifp->if_watchdog = elwatchdog;	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS;	/* Now we can attach the interface. */	dprintf(("Attaching interface...\n"));	if_attach(ifp);	ether_ifattach(ifp);	/* Print out some information for the user. */	printf(": address %s\n", ether_sprintf(sc->sc_arpcom.ac_enaddr));	/* Finally, attach to bpf filter if it is present. */#if NBPFILTER > 0	dprintf(("Attaching to BPF...\n"));	bpfattach(&ifp->if_bpf, ifp, DLT_EN10MB, sizeof(struct ether_header));#endif	sc->sc_ih = isa_intr_establish(ia->ia_irq, IST_EDGE, IPL_NET, elintr,	    sc);	dprintf(("elattach() finished.\n"));}/* * Reset interface. */voidelreset(sc)	struct el_softc *sc;{	int s;	dprintf(("elreset()\n"));	s = splnet();	elstop(sc);	elinit(sc);	splx(s);}/* * Stop interface. */voidelstop(sc)	struct el_softc *sc;{	outb(sc->sc_iobase+EL_AC, 0);}/* * Do a hardware reset of the board, and upload the ethernet address again in * case the board forgets. */static inline voidel_hardreset(sc)	struct el_softc *sc;{	int iobase = sc->sc_iobase;	int i;	outb(iobase+EL_AC, EL_AC_RESET);	delay(5);	outb(iobase+EL_AC, 0);	for (i = 0; i < ETHER_ADDR_LEN; i++)		outb(iobase+i, sc->sc_arpcom.ac_enaddr[i]);}/* * Initialize interface. */intelinit(sc)	struct el_softc *sc;{	struct ifnet *ifp = &sc->sc_arpcom.ac_if;	int iobase = sc->sc_iobase;	/* First, reset the board. */	el_hardreset(sc);	/* Configure rx. */	dprintf(("Configuring rx...\n"));	if (ifp->if_flags & IFF_PROMISC)		outb(iobase+EL_RXC, EL_RXC_AGF | EL_RXC_DSHORT | EL_RXC_DDRIB | EL_RXC_DOFLOW | EL_RXC_PROMISC);	else		outb(iobase+EL_RXC, EL_RXC_AGF | EL_RXC_DSHORT | EL_RXC_DDRIB | EL_RXC_DOFLOW | EL_RXC_ABROAD);	outb(iobase+EL_RBC, 0);	/* Configure TX. */	dprintf(("Configuring tx...\n"));	outb(iobase+EL_TXC, 0);	/* Start reception. */	dprintf(("Starting reception...\n"));	outb(iobase+EL_AC, EL_AC_IRQE | EL_AC_RX);	/* Set flags appropriately. */	ifp->if_flags |= IFF_RUNNING;	ifp->if_flags &= ~IFF_OACTIVE;	/* And start output. */	elstart(ifp);}/* * Start output on interface.  Get datagrams from the queue and output them, * giving the receiver a chance between datagrams.  Call only from splnet or * interrupt level! */voidelstart(ifp)	struct ifnet *ifp;{	struct el_softc *sc = elcd.cd_devs[ifp->if_unit];	int iobase = sc->sc_iobase;	struct mbuf *m, *m0;	int s, i, off, retries;	dprintf(("elstart()...\n"));	s = splnet();	/* Don't do anything if output is active. */	if ((ifp->if_flags & IFF_OACTIVE) != 0) {		splx(s);		return;	}	ifp->if_flags |= IFF_OACTIVE;	/*	 * The main loop.  They warned me against endless loops, but would I	 * listen?  NOOO....	 */	for (;;) {		/* Dequeue the next datagram. */		IF_DEQUEUE(&ifp->if_snd, m0);		/* If there's nothing to send, return. */		if (m0 == 0)			break;#if NBPFILTER > 0		/* Give the packet to the bpf, if any. */		if (ifp->if_bpf)			bpf_mtap(ifp->if_bpf, m0);#endif		/* Disable the receiver. */		outb(iobase+EL_AC, EL_AC_HOST);		outb(iobase+EL_RBC, 0);		/* Transfer datagram to board. */		dprintf(("el: xfr pkt length=%d...\n", m0->m_pkthdr.len));		off = EL_BUFSIZ - max(m0->m_pkthdr.len, ETHER_MIN_LEN);		outb(iobase+EL_GPBL, off);		outb(iobase+EL_GPBH, off >> 8);		/* Copy the datagram to the buffer. */		for (m = m0; m != 0; m = m->m_next)			outsb(iobase+EL_BUF, mtod(m, caddr_t), m->m_len);		m_freem(m0);		/* Now transmit the datagram. */		retries = 0;		for (;;) {			outb(iobase+EL_GPBL, off);			outb(iobase+EL_GPBH, off >> 8);			if (el_xmit(sc)) {				ifp->if_oerrors++;				break;			}			/* Check out status. */			i = inb(iobase+EL_TXS);			dprintf(("tx status=0x%x\n", i));			if ((i & EL_TXS_READY) == 0) {				dprintf(("el: err txs=%x\n", i));				if (i & (EL_TXS_COLL | EL_TXS_COLL16)) {					ifp->if_collisions++;					if ((i & EL_TXC_DCOLL16) == 0 &&					    retries < 15) {						retries++;						outb(iobase+EL_AC, EL_AC_HOST);					}				} else {					ifp->if_oerrors++;					break;				}			} else {				ifp->if_opackets++;				break;			}		}		/*		 * Now give the card a chance to receive.		 * Gotta love 3c501s...		 */		(void)inb(iobase+EL_AS);		outb(iobase+EL_AC, EL_AC_IRQE | EL_AC_RX);		splx(s);		/* Interrupt here. */		s = splnet();	}	(void)inb(iobase+EL_AS);	outb(iobase+EL_AC, EL_AC_IRQE | EL_AC_RX);	ifp->if_flags &= ~IFF_OACTIVE;	splx(s);}/* * This function actually attempts to transmit a datagram downloaded to the * board.  Call at splnet or interrupt, after downloading data!  Returns 0 on * success, non-0 on failure. */static intel_xmit(sc)	struct el_softc *sc;{	int iobase = sc->sc_iobase;	int i;	/*	 * XXX	 * This busy-waits for the tx completion.  Can we get an interrupt	 * instead?	 */	dprintf(("el: xmit..."));	outb(iobase+EL_AC, EL_AC_TXFRX);	i = 20000;	while ((inb(iobase+EL_AS) & EL_AS_TXBUSY) && (i > 0))		i--;	if (i == 0) {		dprintf(("tx not ready\n"));		return -1;	}	dprintf(("%d cycles.\n", 20000 - i));	return 0;}/* * Controller interrupt. */intelintr(arg)	void *arg;{	register struct el_softc *sc = arg;	int iobase = sc->sc_iobase;	int rxstat, len;	dprintf(("elintr: "));	/* Check board status. */	if ((inb(iobase+EL_AS) & EL_AS_RXBUSY) != 0) {		(void)inb(iobase+EL_RXC);		outb(iobase+EL_AC, EL_AC_IRQE | EL_AC_RX);		return 0;	}	for (;;) {		rxstat = inb(iobase+EL_RXS);		if (rxstat & EL_RXS_STALE)			break;		/* If there's an overflow, reinit the board. */		if ((rxstat & EL_RXS_NOFLOW) == 0) {			dprintf(("overflow.\n"));			el_hardreset(sc);			/* Put board back into receive mode. */			if (sc->sc_arpcom.ac_if.if_flags & IFF_PROMISC)				outb(iobase+EL_RXC, EL_RXC_AGF | EL_RXC_DSHORT | EL_RXC_DDRIB | EL_RXC_DOFLOW | EL_RXC_PROMISC);			else				outb(iobase+EL_RXC, EL_RXC_AGF | EL_RXC_DSHORT | EL_RXC_DDRIB | EL_RXC_DOFLOW | EL_RXC_ABROAD);			(void)inb(iobase+EL_AS);			outb(iobase+EL_RBC, 0);			break;		}		/* Incoming packet. */		len = inb(iobase+EL_RBL);		len |= inb(iobase+EL_RBH) << 8;		dprintf(("receive len=%d rxstat=%x ", len, rxstat));		outb(iobase+EL_AC, EL_AC_HOST);		/* Pass data up to upper levels. */		elread(sc, len);		/* Is there another packet? */		if ((inb(iobase+EL_AS) & EL_AS_RXBUSY) != 0)			break;		dprintf(("<rescan> "));	}	(void)inb(iobase+EL_RXC);	outb(iobase+EL_AC, EL_AC_IRQE | EL_AC_RX);	return 1;}/* * Pass a packet to the higher levels. */voidelread(sc, len)	register struct el_softc *sc;	int len;{	struct ifnet *ifp = &sc->sc_arpcom.ac_if;	struct mbuf *m;	struct ether_header *eh;	if (len <= sizeof(struct ether_header) ||	    len > ETHER_MAX_LEN) {		printf("%s: invalid packet size %d; dropping\n",		    sc->sc_dev.dv_xname, len);		ifp->if_ierrors++;		return;	}	/* Pull packet off interface. */	m = elget(sc, len);	if (m == 0) {		ifp->if_ierrors++;		return;	}	ifp->if_ipackets++;	/* We assume that the header fit entirely in one mbuf. */	eh = mtod(m, struct ether_header *);#if NBPFILTER > 0	/*	 * Check if there's a BPF listener on this interface.	 * If so, hand off the raw packet to BPF.	 */	if (ifp->if_bpf) {		bpf_mtap(ifp->if_bpf, m);		/*		 * Note that the interface cannot be in promiscuous mode if		 * there are no BPF listeners.  And if we are in promiscuous		 * mode, we have to check if this packet is really ours.		 */		if ((ifp->if_flags & IFF_PROMISC) &&		    (eh->ether_dhost[0] & 1) == 0 && /* !mcast and !bcast */		    bcmp(eh->ether_dhost, sc->sc_arpcom.ac_enaddr,			    sizeof(eh->ether_dhost)) != 0) {			m_freem(m);			return;		}	}#endif	/* We assume that the header fit entirely in one mbuf. */	m_adj(m, sizeof(struct ether_header));	ether_input(ifp, eh, m);}/* * Pull read data off a interface.  Len is length of data, with local net * header stripped.  We copy the data into mbufs.  When full cluster sized * units are present we copy into clusters. */struct mbuf *elget(sc, totlen)	struct el_softc *sc;	int totlen;{	struct ifnet *ifp = &sc->sc_arpcom.ac_if;	int iobase = sc->sc_iobase;	struct mbuf *top, **mp, *m;	int len;	MGETHDR(m, M_DONTWAIT, MT_DATA);	if (m == 0)		return 0;	m->m_pkthdr.rcvif = ifp;	m->m_pkthdr.len = totlen;	len = MHLEN;	top = 0;	mp = &top;	outb(iobase+EL_GPBL, 0);	outb(iobase+EL_GPBH, 0);	while (totlen > 0) {		if (top) {			MGET(m, M_DONTWAIT, MT_DATA);			if (m == 0) {				m_freem(top);				return 0;			}			len = MLEN;		}		if (totlen >= MINCLSIZE) {			MCLGET(m, M_DONTWAIT);			if (m->m_flags & M_EXT)				len = MCLBYTES;		}		m->m_len = len = min(totlen, len);		insb(iobase+EL_BUF, mtod(m, caddr_t), len);		totlen -= len;		*mp = m;		mp = &m->m_next;	}	outb(iobase+EL_RBC, 0);	outb(iobase+EL_AC, EL_AC_RX);	return top;}