packetLen = packetSize;

    /* copy separated frame to a temporary buffer */
    ne2000DataIn (pDrvCtrl,
		  ((UINT)pDrvCtrl->nextPacket << 8) + sizeof (NE2000_HEADER),
		  packetLen,
		  pData);

doneGet:
    pDrvCtrl->nextPacket = h.next;
    SYS_OUT_CHAR (pDrvCtrl, ENE_BOUND,
		  (pDrvCtrl->nextPacket != NE2000_PSTART ?
		   pDrvCtrl->nextPacket - 1 : NE2000_PSTOP - 1));

    return (packetLen);
    }


/******************************************************************************
*
* ne2000PollRecv - routine to receive a packet in polled mode.
*
* This routine is called by a user to try and get a packet from the
* device.
*/

LOCAL STATUS ne2000PollRecv
    (
    void*	pCookie,	/* device ptr */
    M_BLK_ID	pMblk
    )
    {
    int len;
    NE2000END_DEVICE* pDrvCtrl = (NE2000END_DEVICE *) pCookie;

    /* If no packet is available return immediately */
    pDrvCtrl->current = ne2000GetCurr (pDrvCtrl);
    if (pDrvCtrl->nextPacket == pDrvCtrl->current)
        return ((STATUS) (EAGAIN));

    /* Upper layer provides the buffer, make sure it's big enough. */
    if ((pMblk->mBlkHdr.mLen < NE2000_BUFSIZ)
	|| !(pMblk->mBlkHdr.mFlags & M_EXT))
	{
        return ((STATUS) (EAGAIN));
	}

    ENDLOGMSG (("ne2000PollRecv: enter: imask=%02x\n",
		pDrvCtrl->imask, 0, 0, 0, 0, 0));

    len = ne2000PacketGet (pDrvCtrl, pMblk->mBlkHdr.mData + pDrvCtrl->offset);
    if (len <= 0)
        return ((STATUS) (EAGAIN));
    pMblk->mBlkHdr.mFlags |= M_PKTHDR;
    pMblk->mBlkHdr.mLen   = len;
    pMblk->mBlkPktHdr.len = len;
    /* Adjust mData to match n23000PacketGet() above */
    pMblk->mBlkHdr.mData += pDrvCtrl->offset;

    ENDLOGMSG (("ne2000PollRecv: done: imask=%02x\n",
		pDrvCtrl->imask, 0, 0, 0, 0, 0));
    return (OK);
    }

/*******************************************************************************
*
* ne2000PollSend - routine to send a packet in polled mode.
*
* This routine is called by a user to try and send a packet on the
* device.
*/

static STATUS ne2000PollSend
    (
    void*	pCookie,	/* device ptr */
    M_BLK_ID	pMblk
    )
    {
    char *	pBuf;
    UCHAR	cmdStat;
    int		len;
    NE2000END_DEVICE* pDrvCtrl = (NE2000END_DEVICE *) pCookie;

    ENDLOGMSG (("ne2000PollSend: enter: imask=%x flags=%x\n",
		pDrvCtrl->imask, pDrvCtrl->flags, 0, 0, 0, 0));

    SYS_IN_CHAR (pDrvCtrl, ENE_CMD, &cmdStat);
    while (cmdStat & CMD_TXP)
	SYS_IN_CHAR (pDrvCtrl, ENE_DATA, &cmdStat);

    /* Get the next TXD */

    pBuf = pDrvCtrl->packetBuf;
    len = netMblkToBufCopy (pMblk, pBuf, NULL);
    len = max (len, ETHERSMALL);

    /* Transfer to the device */

    ne2000DataOut (pDrvCtrl, pDrvCtrl->packetBuf, len, (NE2000_TSTART << 8));

    /* Flush the write pipe */

    CACHE_PIPE_FLUSH ();

    /* kick Transmitter */

    SYS_OUT_CHAR (pDrvCtrl, ENE_TSTART, NE2000_TSTART);
    SYS_OUT_CHAR (pDrvCtrl, ENE_TCNTH, len >> 8);
    SYS_OUT_CHAR (pDrvCtrl, ENE_TCNTL, len & 0xff);
    SYS_OUT_CHAR (pDrvCtrl, ENE_CMD, CMD_TXP | CMD_START);

    /* update statistics */

    END_ERR_ADD (&pDrvCtrl->endObj, MIB2_OUT_UCAST, +1);

    /* Flush the write pipe */

    CACHE_PIPE_FLUSH ();

    /* Spin until the packet has been sent */

    SYS_IN_CHAR (pDrvCtrl, ENE_CMD, &cmdStat);
    while (cmdStat & CMD_TXP)
	SYS_IN_CHAR (pDrvCtrl, ENE_CMD, &cmdStat);

    ENDLOGMSG (("ne2000PollSend: done: imask=%x flags=%x\n",
		pDrvCtrl->imask, pDrvCtrl->flags, 0, 0, 0, 0));

    return (OK);
    }

/*******************************************************************************
*
* ne2000PollStart - start polled mode operations
*
* RETURNS: OK or ERROR.
*/

LOCAL STATUS ne2000PollStart
    (
    NE2000END_DEVICE* pDrvCtrl
    )
    {
    int oldLevel;

    oldLevel = intLock ();
    ENDLOGMSG (("ne2000PollStart: imask=%x flags=%x\n",
		pDrvCtrl->imask, pDrvCtrl->flags, 0, 0, 0, 0));
    pDrvCtrl->flags |= END_POLLING;
    pDrvCtrl->imask = 0;
    SYS_OUT_CHAR (pDrvCtrl, ENE_INTMASK, pDrvCtrl->imask);
    intUnlock (oldLevel);

    return (OK);
    }

/*******************************************************************************
*
* ne2000PollStop - stop polled mode operations
*
* This function terminates polled mode operation.  The device returns to
* interrupt mode.
*
* The device interrupts are enabled, the current mode flag is switched
* to indicate interrupt mode and the device is then reconfigured for
* interrupt operation.
*
* RETURNS: OK or ERROR.
*/

LOCAL STATUS ne2000PollStop
    (
    NE2000END_DEVICE* pDrvCtrl
    )
    {
    int oldLevel;

    oldLevel = intLock ();
    pDrvCtrl->flags &= ~END_POLLING;
    pDrvCtrl->imask = NE2000_ALL_INTS;
    /* leave recv int disabled if in receive loop. */
    if (pDrvCtrl->flags & END_RECV_HANDLING_FLAG)
	pDrvCtrl->imask &= ~IM_PRXE;
    SYS_OUT_CHAR (pDrvCtrl, ENE_INTMASK, pDrvCtrl->imask);

    ENDLOGMSG (("ne2000PollStop: imask=%x flags=%x\n",
		pDrvCtrl->imask, pDrvCtrl->flags, 0, 0, 0, 0));
    intUnlock (oldLevel);
    return (OK);
    }

/******************************************************************************
*
* ne2000AddrFilterSet - set the address filter for multicast addresses
*
* This routine loops through all of the multicast addresses on the list
* of addresses (added with the endAddrAdd() routine) and sets the
* device's filter appropriately.
*
* NOMANUAL
*/
LOCAL void ne2000AddrFilterSet
    (
    NE2000END_DEVICE *pDrvCtrl
    )
    {
    int i;
    int eAddr;
    u_char enetChar;
    u_char *pCp;
    u_long crc;
    ETHER_MULTI* pCurr;

    ENDLOGMSG (("ne2000AddrFilterSet\n", 0, 0, 0, 0, 0, 0));

    /*
     * There are 8 multicast address registers (MAR0-7) which
     * decode the multicast addresses to be received.  These
     * registers provide filtering of multicast addresses hashed
     * by the CRC hardware logic.  All destination addresses are
     * fed through the CRC hardware logic and when the last bit
     * of the destination address enters the CRC hardware, the
     * 6 MSB's of the CRC generator are latched.  These six bits
     * are then used to index a unique filter bit (FB0-63, 64 since
     * there are eight-8bit registers, and 2^6 = 64) in the multicast
     * address registers.   If the index filter bit is set,
     * the packet is accepted.
     *
     * To configure MAR0-7 to accept a specific multicast address,
     * the above sequence must be also be duplicated in software to
     * determine which filter bit in the multicast registers should
     * be set for a given multicast address.   Several bits can be
     * set to accept several multicast addresses.
     *
     * The standard AUTODIN-II polynomial is used for the 32-bit CRC
     * hash index calculation.  The AUTODIN-II, FDDI, ethernet
     * polynomial for 32 bit CRC is 0x04c11db7, as deemed kosher
     * by the mighty polynomial gods of error awareness.
     *
     * The polynomial is expressed:
     *
     *   ( x^32 + x^26 + x^23 + x^22 + x^16 +
     *     x^12 + x^11 + x^10 + x^8  + x^7  +
     *            x^5  + x^4  + x^2  + x^1  + 1 ) = 0x04c11db7
     *
     * Where x = base 2 (binary) and x^32 is ignored for CRC.
     *
     */

    /* initialize (clear) all filter bits */

    for (i = 0; i < 8; ++i)
	pDrvCtrl->mcastFilter[i] = 0;


    /* set the proper MAR0-7 filter bit(s) for every address */

    for (pCurr = END_MULTI_LST_FIRST (&pDrvCtrl->endObj);
	 pCurr != NULL;
	 pCurr = END_MULTI_LST_NEXT(pCurr))
	{
	pCp = (unsigned char *)&pCurr->addr;

	crc = 0xffffffff;  /* initial CRC seed */

	/* build the CRC for the 6 byte adrs */

	for (eAddr = 0; eAddr < 6; eAddr++)
	    {
	    enetChar = *pCp++;
            crc = ne2000CrcWork (enetChar, crc);
	    }

	/*
	 * We now have the crc for the current address and we are
	 * interested in the 6 most significant bits of the crc
	 * for indexing because that is whats latched by the CRC
	 * hardware logic.
	 *
	 * Which of the eight MAR registers, 0-7, is indexed with
	 * the upper three bits of the six.  Which of the eight bits
	 * to set in that MAR register is indexed by the lower three
	 * bits of the six.
	 */

	/* get six msb */

	crc >>= 26;
	crc &= 0x3f;


	/* high 3 bit index MAR reg, low three bits index reg bit */

	pDrvCtrl->mcastFilter[crc >> 3] |= (1 << (crc & 7));
	}
    }

/*****************************************************************************
*
* ne2000CrcWork - return CRC using a 32 bit polynomial
*
* This is a work routine used by ne2000AddrFilterSet
*
* NOMANUAL
*
*/

LOCAL UINT32 ne2000CrcWork
    (
    UINT8 inChar,
    UINT32 inCrc
    )
    {
    UINT8 work = 0;
    UINT8 wrap;
    int i;

    /*
     * standard CRC algorithm, 8 bit stream.
     */

    for (i = 0; i < 8; i++)
        {
        wrap = (inCrc >> 31);
        inCrc <<= 1;
        work  = ((work << 1) | wrap) ^ inChar;
        if (work & 1)
            {
            inCrc ^= CRC32_POLYNOMIAL;
            }
         work >>= 1;
         inChar >>= 1;
         }
     return (inCrc);
     }


/*****************************************************************************
*
* ne2000MCastAdd - add a multicast address for the device
*
* This routine adds a multicast address to whatever the driver
* is already listening for.  It then resets the address filter.
*/

LOCAL STATUS ne2000MCastAdd
    (
    void*	pCookie,	/* device ptr */
    char*	pAddress
    )
    {
    NE2000END_DEVICE* pDrvCtrl = (NE2000END_DEVICE *) pCookie;

    ENDLOGMSG (("ne2000MCastAdd - %02x:%02x:%02x:%02x:%02x:%02x\n",
		pAddress[0]&0xff, pAddress[1]&0xff, pAddress[2]&0xff,
		pAddress[3]&0xff, pAddress[4]&0xff, pAddress[5]&0xff));

    if (etherMultiAdd (&pDrvCtrl->endObj.multiList, pAddress) == ENETRESET)
	{
	ne2000Config (pDrvCtrl, TRUE);
	}

    return (OK);
    }

/*****************************************************************************
*
* ne2000MCastDel - delete a multicast address for the device
*
* This routine removes a multicast address from whatever the driver
* is listening for.  It then resets the address filter.
*/

LOCAL STATUS ne2000MCastDel
    (
    void*	pCookie,	/* device ptr */
    char*	pAddress
    )
    {
    NE2000END_DEVICE* pDrvCtrl = (NE2000END_DEVICE *) pCookie;

    ENDLOGMSG (("ne2000MCastDel - %02x:%02x:%02x:%02x:%02x:%02x\n",
		pAddress[0]&0xff, pAddress[1]&0xff, pAddress[2]&0xff,
		pAddress[3]&0xff, pAddress[4]&0xff, pAddress[5]&0xff));

    if (etherMultiDel (&pDrvCtrl->endObj.multiList,
		       (char *)pAddress) == ENETRESET)
	{
	ne2000Config (pDrvCtrl, TRUE);
	}

    return (OK);
    }

/*****************************************************************************
*
* ne2000MCastGet - get the multicast address list for the device
*
* This routine gets the multicast list of whatever the driver
* is already listening for.
*/

LOCAL STATUS ne2000MCastGet
    (
    void*		pCookie,	/* device ptr */
    MULTI_TABLE*	pTable
    )
    {
    int error;
    NE2000END_DEVICE* pDrvCtrl = (NE2000END_DEVICE *) pCookie;

    ENDLOGMSG (("ne2000MCastGet\n", 0, 0, 0, 0, 0, 0));
    error = etherMultiGet (&pDrvCtrl->endObj.multiList, pTable);

    return (error);
    }

/******************************************************************************
*
* ne2000Stop - stop the device
*
* This function calls BSP functions to disconnect interrupts and stop
* the device from operating in interrupt mode.
*
* RETURNS: OK or ERROR
*/

LOCAL STATUS ne2000Stop
    (
    void *pCookie
    )
    {
    STATUS result = OK;
    NE2000END_DEVICE* pDrvCtrl;

    pDrvCtrl = (NE2000END_DEVICE *) pCookie;

    /* mark the interface -- down */

    END_FLAGS_CLR (&pDrvCtrl->endObj, IFF_UP | IFF_RUNNING);

    /* Disable device interru