Add driver support for PCI fast ethernet adapters based on the

RealTek 8129/8139 chipset like I've been threatening. Update kernel
configs, userconfig.c, relnotes and sysinstall. No man page yet;
comming soon.

I consider this driver stable enough that I want to give it some
exposure in -current.

1 files changed, 1989 insertions, 0 deletions

diff --git a/sys/pci/if_rl.c b/sys/pci/if_rl.c
new file mode 100644
index 0000000..d9ec512
--- /dev/null
+++ b/sys/pci/if_rl.c
@@ -0,0 +1,1989 @@
+/*
+ * Copyright (c) 1997, 1998
+ *	Bill Paul <wpaul@ctr.columbia.edu>.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by Bill Paul.
+ * 4. Neither the name of the author nor the names of any co-contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR THE VOICES IN HIS HEAD
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *	$Id: if_rl.c,v 1.13 1998/10/07 22:51:30 wpaul Exp $
+ */
+
+/*
+ * RealTek 8129/8139 PCI NIC driver
+ *
+ * Supports several extremely cheap PCI 10/100 adapters based on
+ * the RealTek chipset. Datasheets can be obtained from
+ * www.realtek.com.tw.
+ *
+ * Written by Bill Paul <wpaul@ctr.columbia.edu>
+ * Electrical Engineering Department
+ * Columbia University, New York City
+ */
+
+/*
+ * The RealTek 8139 PCI NIC redefines the meaning of 'low end.' This is
+ * probably the worst PCI ethernet controller ever made, with the possible
+ * exception of the FEAST chip made by SMC. The 8139 supports bus-master
+ * DMA, but it has a terrible interface that nullifies any performance
+ * gains that bus-master DMA usually offers.
+ *
+ * For transmission, the chip offers a series of four TX descriptor
+ * registers. Each transmit frame must be in a contiguous buffer, aligned
+ * on a doubleword (32-bit) boundary. This means we almost always have to
+ * do mbuf copies in order to transmit a frame, except in the unlikely
+ * case where a) the packet fits into a single mbuf, and b) the packet
+ * is 32-bit aligned within the mbuf's data area. The presence of only
+ * four descriptor registers means that we can never have more than four
+ * packets queued for transmission at any one time.
+ *
+ * Reception is not much better. The driver has to allocate a single large
+ * buffer area (up to 64K in size) into which the chip will DMA received
+ * frames. Because we don't know where within this region received packets
+ * will begin or end, we have no choice but to copy data from the buffer
+ * area into mbufs in order to pass the packets up to the higher protocol
+ * levels.
+ *
+ * It's impossible given this rotten design to really achieve decent
+ * performance at 100Mbps, unless you happen to have a 400Mhz PII or
+ * some equally overmuscled CPU to drive it.
+ *
+ * On the bright side, the 8139 does have a built-in PHY, although
+ * rather than using an MDIO serial interface like most other NICs, the
+ * PHY registers are directly accessible through the 8139's register
+ * space. The 8139 supports autonegotiation, as well as a 64-bit multicast
+ * filter.
+ *
+ * The 8129 chip is an older version of the 8139 that uses an external PHY
+ * chip. The 8129 has a serial MDIO interface for accessing the MII where
+ * the 8139 lets you directly access the on-board PHY registers. We need
+ * to select which interface to use depending on the chip type.
+ *
+ * Note: beware of trying to use the Linux RealTek driver as a reference
+ * for information about the RealTek chip. It contains several bogosities.
+ * It contains definitions for several undocumented registers which it
+ * claims are 'required for proper operation' yet it does not use these
+ * registers anywhere in the code. It also refers to some undocumented
+ * 'Twister tuning codes' which it doesn't use anywhere. It also contains
+ * bit definitions for several registers which are totally ignored: magic
+ * numbers are used instead, making the code hard to read.
+ */
+
+#include "bpfilter.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/sockio.h>
+#include <sys/mbuf.h>
+#include <sys/malloc.h>
+#include <sys/kernel.h>
+#include <sys/socket.h>
+
+#include <net/if.h>
+#include <net/if_arp.h>
+#include <net/ethernet.h>
+#include <net/if_dl.h>
+#include <net/if_media.h>
+
+#if NBPFILTER > 0
+#include <net/bpf.h>
+#endif
+
+#include <vm/vm.h>              /* for vtophys */
+#include <vm/pmap.h>            /* for vtophys */
+#include <machine/clock.h>      /* for DELAY */
+
+#include <pci/pcireg.h>
+#include <pci/pcivar.h>
+
+/*
+ * Default to using PIO access for this driver. On SMP systems,
+ * there appear to be problems with memory mapped mode: it looks like
+ * doing too many memory mapped access back to back in rapid succession
+ * can hang the bus. I'm inclined to blame this on crummy design/construction
+ * on the part of RealTek. Memory mapped mode does appear to work on
+ * uniprocessor systems though.
+ */
+#define RL_USEIOSPACE
+
+#include <pci/if_rlreg.h>
+
+#ifndef lint
+static char rcsid[] =
+	"$Id: if_rl.c,v 1.13 1998/10/07 22:51:30 wpaul Exp $";
+#endif
+
+/*
+ * Various supported device vendors/types and their names.
+ */
+static struct rl_type rl_devs[] = {
+	{ RT_VENDORID, RT_DEVICEID_8129,
+		"RealTek 8129 10/100BaseTX" },
+	{ RT_VENDORID, RT_DEVICEID_8139,
+		"RealTek 8139 10/100BaseTX" },
+	{ RT_VENDORID_ALT, RT_DEVICEID_8139_ALT,
+		"RealTek 8139 10/100BaseTX" },
+	{ 0, 0, NULL }
+};
+
+/*
+ * Various supported PHY vendors/types and their names. Note that
+ * this driver will work with pretty much any MII-compliant PHY,
+ * so failure to positively identify the chip is not a fatal error.
+ */
+
+static struct rl_type rl_phys[] = {
+	{ TI_PHY_VENDORID, TI_PHY_10BT, "<TI ThunderLAN 10BT (internal)>" },
+	{ TI_PHY_VENDORID, TI_PHY_100VGPMI, "<TI TNETE211 100VG Any-LAN>" },
+	{ NS_PHY_VENDORID, NS_PHY_83840A, "<National Semiconductor DP83840A>"},
+	{ LEVEL1_PHY_VENDORID, LEVEL1_PHY_LXT970, "<Level 1 LXT970>" }, 
+	{ INTEL_PHY_VENDORID, INTEL_PHY_82555, "<Intel 82555>" },
+	{ SEEQ_PHY_VENDORID, SEEQ_PHY_80220, "<SEEQ 80220>" },
+	{ 0, 0, "<MII-compliant physical interface>" }
+};
+
+static unsigned long rl_count = 0;
+static char *rl_probe		__P((pcici_t, pcidi_t));
+static void rl_attach		__P((pcici_t, int));
+
+static int rl_encap		__P((struct rl_softc *, struct rl_chain *,
+						struct mbuf * ));
+
+static void rl_rxeof		__P((struct rl_softc *));
+static void rl_txeof		__P((struct rl_softc *));
+static void rl_txeoc		__P((struct rl_softc *));
+static void rl_intr		__P((void *));
+static void rl_start		__P((struct ifnet *));
+static int rl_ioctl		__P((struct ifnet *, u_long, caddr_t));
+static void rl_init		__P((void *));
+static void rl_stop		__P((struct rl_softc *));
+static void rl_watchdog		__P((struct ifnet *));
+static void rl_shutdown		__P((int, void *));
+static int rl_ifmedia_upd	__P((struct ifnet *));
+static void rl_ifmedia_sts	__P((struct ifnet *, struct ifmediareq *));
+
+static void rl_eeprom_putbyte	__P((struct rl_softc *, u_int8_t));
+static void rl_eeprom_getword	__P((struct rl_softc *, u_int8_t, u_int16_t *));
+static void rl_read_eeprom	__P((struct rl_softc *, caddr_t,
+					int, int, int));
+static void rl_mii_sync		__P((struct rl_softc *));
+static void rl_mii_send		__P((struct rl_softc *, u_int32_t, int));
+static int rl_mii_readreg	__P((struct rl_softc *, struct rl_mii_frame *));
+static int rl_mii_writereg	__P((struct rl_softc *, struct rl_mii_frame *));
+
+static u_int16_t rl_phy_readreg	__P((struct rl_softc *, int));
+static void rl_phy_writereg	__P((struct rl_softc *, u_int16_t, u_int16_t));
+
+static void rl_autoneg_xmit	__P((struct rl_softc *));
+static void rl_autoneg_mii	__P((struct rl_softc *, int, int));
+static void rl_setmode_mii	__P((struct rl_softc *, int));
+static void rl_getmode_mii	__P((struct rl_softc *));
+static u_int8_t rl_calchash	__P((u_int8_t *));
+static void rl_setmulti		__P((struct rl_softc *));
+static void rl_reset		__P((struct rl_softc *));
+static int rl_list_tx_init	__P((struct rl_softc *));
+
+#define EE_SET(x)					\
+	CSR_WRITE_1(sc, RL_EECMD,			\
+		CSR_READ_1(sc, RL_EECMD) | x)
+
+#define EE_CLR(x)					\
+	CSR_WRITE_1(sc, RL_EECMD,			\
+		CSR_READ_1(sc, RL_EECMD) & ~x)
+
+/*
+ * Send a read command and address to the EEPROM, check for ACK.
+ */
+static void rl_eeprom_putbyte(sc, addr)
+	struct rl_softc		*sc;
+	u_int8_t		addr;
+{
+	register int		d, i;
+
+	d = addr | RL_EECMD_READ;
+
+	/*
+	 * Feed in each bit and stobe the clock.
+	 */
+	for (i = 0x400; i; i >>= 1) {
+		if (d & i) {
+			EE_SET(RL_EE_DATAIN);
+		} else {
+			EE_CLR(RL_EE_DATAIN);
+		}
+		DELAY(100);
+		EE_SET(RL_EE_CLK);
+		DELAY(150);
+		EE_CLR(RL_EE_CLK);
+		DELAY(100);
+	}
+
+	return;
+}
+
+/*
+ * Read a word of data stored in the EEPROM at address 'addr.'
+ */
+static void rl_eeprom_getword(sc, addr, dest)
+	struct rl_softc		*sc;
+	u_int8_t		addr;
+	u_int16_t		*dest;
+{
+	register int		i;
+	u_int16_t		word = 0;
+
+	/* Enter EEPROM access mode. */
+	CSR_WRITE_1(sc, RL_EECMD, RL_EEMODE_PROGRAM|RL_EE_SEL);
+
+	/*
+	 * Send address of word we want to read.
+	 */
+	rl_eeprom_putbyte(sc, addr);
+
+	CSR_WRITE_1(sc, RL_EECMD, RL_EEMODE_PROGRAM|RL_EE_SEL);
+
+	/*
+	 * Start reading bits from EEPROM.
+	 */
+	for (i = 0x8000; i; i >>= 1) {
+		EE_SET(RL_EE_CLK);
+		DELAY(100);
+		if (CSR_READ_1(sc, RL_EECMD) & RL_EE_DATAOUT)
+			word |= i;
+		EE_CLR(RL_EE_CLK);
+		DELAY(100);
+	}
+
+	/* Turn off EEPROM access mode. */
+	CSR_WRITE_1(sc, RL_EECMD, RL_EEMODE_OFF);
+
+	*dest = word;
+
+	return;
+}
+
+/*
+ * Read a sequence of words from the EEPROM.
+ */
+static void rl_read_eeprom(sc, dest, off, cnt, swap)
+	struct rl_softc		*sc;
+	caddr_t			dest;
+	int			off;
+	int			cnt;
+	int			swap;
+{
+	int			i;
+	u_int16_t		word = 0, *ptr;
+
+	for (i = 0; i < cnt; i++) {
+		rl_eeprom_getword(sc, off + i, &word);
+		ptr = (u_int16_t *)(dest + (i * 2));
+		if (swap)
+			*ptr = ntohs(word);
+		else
+			*ptr = word;
+	}
+
+	return;
+}
+
+
+/*
+ * MII access routines are provided for the 8129, which
+ * doesn't have a built-in PHY. For the 8139, we fake things
+ * up by diverting rl_phy_readreg()/rl_phy_writereg() to the
+ * direct access PHY registers.
+ */
+#define MII_SET(x)					\
+	CSR_WRITE_1(sc, RL_MII,				\
+		CSR_READ_1(sc, RL_MII) | x)
+
+#define MII_CLR(x)					\
+	CSR_WRITE_1(sc, RL_MII,				\
+		CSR_READ_1(sc, RL_MII) & ~x)
+
+/*
+ * Sync the PHYs by setting data bit and strobing the clock 32 times.
+ */
+static void rl_mii_sync(sc)
+	struct rl_softc		*sc;
+{
+	register int		i;
+
+	MII_SET(RL_MII_DIR|RL_MII_DATAOUT);
+
+	for (i = 0; i < 32; i++) {
+		MII_SET(RL_MII_CLK);
+		DELAY(1);
+		MII_CLR(RL_MII_CLK);
+		DELAY(1);
+	}
+
+	return;
+}
+
+/*
+ * Clock a series of bits through the MII.
+ */
+static void rl_mii_send(sc, bits, cnt)
+	struct rl_softc		*sc;
+	u_int32_t		bits;
+	int			cnt;
+{
+	int			i;
+
+	MII_CLR(RL_MII_CLK);
+
+	for (i = (0x1 << (cnt - 1)); i; i >>= 1) {
+                if (bits & i) {
+			MII_SET(RL_MII_DATAOUT);
+                } else {
+			MII_CLR(RL_MII_DATAOUT);
+                }
+		DELAY(1);
+		MII_CLR(RL_MII_CLK);
+		DELAY(1);
+		MII_SET(RL_MII_CLK);
+	}
+}
+
+/*
+ * Read an PHY register through the MII.
+ */
+static int rl_mii_readreg(sc, frame)
+	struct rl_softc		*sc;
+	struct rl_mii_frame	*frame;
+	
+{
+	int			i, ack, s;
+
+	s = splimp();
+
+	/*
+	 * Set up frame for RX.
+	 */
+	frame->mii_stdelim = RL_MII_STARTDELIM;
+	frame->mii_opcode = RL_MII_READOP;
+	frame->mii_turnaround = 0;
+	frame->mii_data = 0;
+	
+	CSR_WRITE_2(sc, RL_MII, 0);
+
+	/*
+ 	 * Turn on data xmit.
+	 */
+	MII_SET(RL_MII_DIR);
+
+	rl_mii_sync(sc);
+
+	/*
+	 * Send command/address info.
+	 */
+	rl_mii_send(sc, frame->mii_stdelim, 2);
+	rl_mii_send(sc, frame->mii_opcode, 2);
+	rl_mii_send(sc, frame->mii_phyaddr, 5);
+	rl_mii_send(sc, frame->mii_regaddr, 5);
+
+	/* Idle bit */
+	MII_CLR((RL_MII_CLK|RL_MII_DATAOUT));
+	DELAY(1);
+	MII_SET(RL_MII_CLK);
+	DELAY(1);
+
+	/* Turn off xmit. */
+	MII_CLR(RL_MII_DIR);
+
+	/* Check for ack */
+	MII_CLR(RL_MII_CLK);
+	DELAY(1);
+	MII_SET(RL_MII_CLK);
+	DELAY(1);
+	ack = CSR_READ_2(sc, RL_MII) & RL_MII_DATAIN;
+
+	/*
+	 * Now try reading data bits. If the ack failed, we still
+	 * need to clock through 16 cycles to keep the PHY(s) in sync.
+	 */
+	if (ack) {
+		for(i = 0; i < 16; i++) {
+			MII_CLR(RL_MII_CLK);
+			DELAY(1);
+			MII_SET(RL_MII_CLK);
+			DELAY(1);
+		}
+		goto fail;
+	}
+
+	for (i = 0x8000; i; i >>= 1) {
+		MII_CLR(RL_MII_CLK);
+		DELAY(1);
+		if (!ack) {
+			if (CSR_READ_2(sc, RL_MII) & RL_MII_DATAIN)
+				frame->mii_data |= i;
+			DELAY(1);
+		}
+		MII_SET(RL_MII_CLK);
+		DELAY(1);
+	}
+
+fail:
+
+	MII_CLR(RL_MII_CLK);
+	DELAY(1);
+	MII_SET(RL_MII_CLK);
+	DELAY(1);
+
+	splx(s);
+
+	if (ack)
+		return(1);
+	return(0);
+}
+
+/*
+ * Write to a PHY register through the MII.
+ */
+static int rl_mii_writereg(sc, frame)
+	struct rl_softc		*sc;
+	struct rl_mii_frame	*frame;
+	
+{
+	int			s;
+
+	s = splimp();
+	/*
+	 * Set up frame for TX.
+	 */
+
+	frame->mii_stdelim = RL_MII_STARTDELIM;
+	frame->mii_opcode = RL_MII_WRITEOP;
+	frame->mii_turnaround = RL_MII_TURNAROUND;
+	
+	/*
+ 	 * Turn on data output.
+	 */
+	MII_SET(RL_MII_DIR);
+
+	rl_mii_sync(sc);
+
+	rl_mii_send(sc, frame->mii_stdelim, 2);
+	rl_mii_send(sc, frame->mii_opcode, 2);
+	rl_mii_send(sc, frame->mii_phyaddr, 5);
+	rl_mii_send(sc, frame->mii_regaddr, 5);
+	rl_mii_send(sc, frame->mii_turnaround, 2);
+	rl_mii_send(sc, frame->mii_data, 16);
+
+	/* Idle bit. */
+	MII_SET(RL_MII_CLK);
+	DELAY(1);
+	MII_CLR(RL_MII_CLK);
+	DELAY(1);
+
+	/*
+	 * Turn off xmit.
+	 */
+	MII_CLR(RL_MII_DIR);
+
+	splx(s);
+
+	return(0);
+}
+
+static u_int16_t rl_phy_readreg(sc, reg)
+	struct rl_softc		*sc;
+	int			reg;
+{
+	struct rl_mii_frame	frame;
+	u_int16_t		rval = 0;
+	u_int16_t		rl8139_reg = 0;
+
+	if (sc->rl_type == RL_8139) {
+		switch(reg) {
+		case PHY_BMCR:
+			rl8139_reg = RL_BMCR;
+			break;
+		case PHY_BMSR:
+			rl8139_reg = RL_BMSR;
+			break;
+		case PHY_ANAR:
+			rl8139_reg = RL_ANAR;
+			break;
+		case PHY_LPAR:
+			rl8139_reg = RL_LPAR;
+			break;
+		default:
+			printf("rl%d: bad phy register\n", sc->rl_unit);
+			return(0);
+		}
+		rval = CSR_READ_2(sc, rl8139_reg);
+		return(rval);
+	}
+
+	bzero((char *)&frame, sizeof(frame));
+
+	frame.mii_phyaddr = sc->rl_phy_addr;
+	frame.mii_regaddr = reg;
+	rl_mii_readreg(sc, &frame);
+
+	return(frame.mii_data);
+}
+
+static void rl_phy_writereg(sc, reg, data)
+	struct rl_softc		*sc;
+	u_int16_t		reg;
+	u_int16_t		data;
+{
+	struct rl_mii_frame	frame;
+	u_int16_t		rl8139_reg = 0;
+
+	if (sc->rl_type == RL_8139) {
+		switch(reg) {
+		case PHY_BMCR:
+			rl8139_reg = RL_BMCR;
+			break;
+		case PHY_BMSR:
+			rl8139_reg = RL_BMSR;
+			break;
+		case PHY_ANAR:
+			rl8139_reg = RL_ANAR;
+			break;
+		case PHY_LPAR:
+			rl8139_reg = RL_LPAR;
+			break;
+		default:
+			printf("rl%d: bad phy register\n", sc->rl_unit);
+			return;
+		}
+		CSR_WRITE_2(sc, rl8139_reg, data);
+	}
+
+	bzero((char *)&frame, sizeof(frame));
+
+	frame.mii_phyaddr = sc->rl_phy_addr;
+	frame.mii_regaddr = reg;
+	frame.mii_data = data;
+
+	rl_mii_writereg(sc, &frame);
+
+	return;
+}
+
+/*
+ * Calculate CRC of a multicast group address, return the lower 6 bits.
+ */
+static u_int8_t rl_calchash(addr)
+	u_int8_t		*addr;
+{
+	u_int32_t		crc, carry;
+	int			i, j;
+	u_int8_t		c;
+
+	/* Compute CRC for the address value. */
+	crc = 0xFFFFFFFF; /* initial value */
+
+	for (i = 0; i < 6; i++) {
+		c = *(addr + i);
+		for (j = 0; j < 8; j++) {
+			carry = ((crc & 0x80000000) ? 1 : 0) ^ (c & 0x01);
+			crc <<= 1;
+			c >>= 1;
+			if (carry)
+				crc = (crc ^ 0x04c11db6) | carry;
+		}
+	}
+
+	/* return the filter bit position */
+	return(crc & 0x0000003F);
+}
+
+/*
+ * Program the 64-bit multicast hash filter.
+ */
+static void rl_setmulti(sc)
+	struct rl_softc		*sc;
+{
+	struct ifnet		*ifp;
+	int			h = 0;
+	u_int32_t		hashes[2] = { 0, 0 };
+	struct ifmultiaddr	*ifma;
+	u_int32_t		rxfilt;
+	int			mcnt = 0;
+
+	ifp = &sc->arpcom.ac_if;
+
+	rxfilt = CSR_READ_4(sc, RL_RXCFG);
+
+	if (ifp->if_flags & IFF_ALLMULTI) {
+		rxfilt |= RL_RXCFG_RX_MULTI;
+		CSR_WRITE_4(sc, RL_RXCFG, rxfilt);
+		CSR_WRITE_4(sc, RL_MAR0, 0xFFFFFFFF);
+		CSR_WRITE_4(sc, RL_MAR4, 0xFFFFFFFF);
+		return;
+	}
+
+	/* first, zot all the existing hash bits */
+	CSR_WRITE_4(sc, RL_MAR0, 0);
+	CSR_WRITE_4(sc, RL_MAR4, 0);
+
+	/* now program new ones */
+	for (ifma = ifp->if_multiaddrs.lh_first; ifma != NULL;
+				ifma = ifma->ifma_link.le_next) {
+		if (ifma->ifma_addr->sa_family != AF_LINK)
+			continue;
+		h = rl_calchash(LLADDR((struct sockaddr_dl *)ifma->ifma_addr));
+		if (h < 32)
+			hashes[0] |= (1 << h);
+		else
+			hashes[1] |= (1 << (h - 32));
+		mcnt++;
+	}
+
+	if (mcnt)
+		rxfilt |= RL_RXCFG_RX_MULTI;
+	else
+		rxfilt &= ~RL_RXCFG_RX_MULTI;
+
+	CSR_WRITE_4(sc, RL_RXCFG, rxfilt);
+	CSR_WRITE_4(sc, RL_MAR0, hashes[0]);
+	CSR_WRITE_4(sc, RL_MAR4, hashes[1]);
+
+	return;
+}
+
+/*
+ * Initiate an autonegotiation session.
+ */
+static void rl_autoneg_xmit(sc)
+	struct rl_softc		*sc;
+{
+	u_int16_t		phy_sts;
+
+	rl_phy_writereg(sc, PHY_BMCR, PHY_BMCR_RESET);
+	DELAY(500);
+	while(rl_phy_readreg(sc, PHY_BMCR)
+			& PHY_BMCR_RESET);
+
+	phy_sts = rl_phy_readreg(sc, PHY_BMCR);
+	phy_sts |= PHY_BMCR_AUTONEGENBL|PHY_BMCR_AUTONEGRSTR;
+	rl_phy_writereg(sc, PHY_BMCR, phy_sts);
+
+	return;
+}
+
+/*
+ * Invoke autonegotiation on a PHY. Also used with the 8139 internal
+ * transceiver.
+ */
+static void rl_autoneg_mii(sc, flag, verbose)
+	struct rl_softc		*sc;
+	int			flag;
+	int			verbose;
+{
+	u_int16_t		phy_sts = 0, media, advert, ability;
+	struct ifnet		*ifp;
+	struct ifmedia		*ifm;
+
+	ifm = &sc->ifmedia;
+	ifp = &sc->arpcom.ac_if;
+
+	/*
+	 * The 100baseT4 PHY sometimes has the 'autoneg supported'
+	 * bit cleared in the status register, but has the 'autoneg enabled'
+	 * bit set in the control register. This is a contradiction, and
+	 * I'm not sure how to handle it. If you want to force an attempt
+	 * to autoneg for 100baseT4 PHYs, #define FORCE_AUTONEG_TFOUR
+	 * and see what happens.
+	 */
+#ifndef FORCE_AUTONEG_TFOUR
+	/*
+	 * First, see if autoneg is supported. If not, there's
+	 * no point in continuing.
+	 */
+	phy_sts = rl_phy_readreg(sc, PHY_BMSR);
+	if (!(phy_sts & PHY_BMSR_CANAUTONEG)) {
+		if (verbose)
+			printf("rl%d: autonegotiation not supported\n",
+							sc->rl_unit);
+		return;
+	}
+#endif
+
+	switch (flag) {
+	case RL_FLAG_FORCEDELAY:
+		/*
+	 	 * XXX Never use this option anywhere but in the probe
+	 	 * routine: making the kernel stop dead in its tracks
+ 		 * for three whole seconds after we've gone multi-user
+		 * is really bad manners.
+	 	 */
+		rl_autoneg_xmit(sc);
+		DELAY(5000000);
+		break;
+	case RL_FLAG_SCHEDDELAY:
+		/*
+		 * Wait for the transmitter to go idle before starting
+		 * an autoneg session, otherwise rl_start() may clobber
+	 	 * our timeout, and we don't want to allow transmission
+		 * during an autoneg session since that can screw it up.
+	 	 */
+		if (sc->rl_cdata.rl_tx_cnt) {
+			sc->rl_want_auto = 1;
+			return;
+		}
+		rl_autoneg_xmit(sc);
+		ifp->if_timer = 5;
+		sc->rl_autoneg = 1;
+		sc->rl_want_auto = 0;
+		return;
+		break;
+	case RL_FLAG_DELAYTIMEO:
+		ifp->if_timer = 0;
+		sc->rl_autoneg = 0;
+		break;
+	default:
+		printf("rl%d: invalid autoneg flag: %d\n", sc->rl_unit, flag);
+		return;
+	}
+
+	if (rl_phy_readreg(sc, PHY_BMSR) & PHY_BMSR_AUTONEGCOMP) {
+		if (verbose)
+			printf("rl%d: autoneg complete, ", sc->rl_unit);
+		phy_sts = rl_phy_readreg(sc, PHY_BMSR);
+	} else {
+		if (verbose)
+			printf("rl%d: autoneg not complete, ", sc->rl_unit);
+	}
+
+	media = rl_phy_readreg(sc, PHY_BMCR);
+
+	/* Link is good. Report modes and set duplex mode. */
+	if (rl_phy_readreg(sc, PHY_BMSR) & PHY_BMSR_LINKSTAT) {
+		if (verbose)
+			printf("link status good ");
+		advert = rl_phy_readreg(sc, PHY_ANAR);
+		ability = rl_phy_readreg(sc, PHY_LPAR);
+
+		if (advert & PHY_ANAR_100BT4 && ability & PHY_ANAR_100BT4) {
+			ifm->ifm_media = IFM_ETHER|IFM_100_T4;
+			media |= PHY_BMCR_SPEEDSEL;
+			media &= ~PHY_BMCR_DUPLEX;
+			printf("(100baseT4)\n");
+		} else if (advert & PHY_ANAR_100BTXFULL &&
+			ability & PHY_ANAR_100BTXFULL) {
+			ifm->ifm_media = IFM_ETHER|IFM_100_TX|IFM_FDX;
+			media |= PHY_BMCR_SPEEDSEL;
+			media |= PHY_BMCR_DUPLEX;
+			printf("(full-duplex, 100Mbps)\n");
+		} else if (advert & PHY_ANAR_100BTXHALF &&
+			ability & PHY_ANAR_100BTXHALF) {
+			ifm->ifm_media = IFM_ETHER|IFM_100_TX|IFM_HDX;
+			media |= PHY_BMCR_SPEEDSEL;
+			media &= ~PHY_BMCR_DUPLEX;
+			printf("(half-duplex, 100Mbps)\n");
+		} else if (advert & PHY_ANAR_10BTFULL &&
+			ability & PHY_ANAR_10BTFULL) {
+			ifm->ifm_media = IFM_ETHER|IFM_10_T|IFM_FDX;
+			media &= ~PHY_BMCR_SPEEDSEL;
+			media |= PHY_BMCR_DUPLEX;
+			printf("(full-duplex, 10Mbps)\n");
+		} else if (advert & PHY_ANAR_10BTHALF &&
+			ability & PHY_ANAR_10BTHALF) {
+			ifm->ifm_media = IFM_ETHER|IFM_10_T|IFM_HDX;
+			media &= ~PHY_BMCR_SPEEDSEL;
+			media &= ~PHY_BMCR_DUPLEX;
+			printf("(half-duplex, 10Mbps)\n");
+		} else {
+			ifm->ifm_media = IFM_ETHER|IFM_10_T|IFM_HDX;
+			media &= ~PHY_BMCR_SPEEDSEL;
+			media &= ~PHY_BMCR_DUPLEX;
+			printf("(unknown mode! forcing half-duplex, 10Mbps)\n");
+		}
+
+		/* Set ASIC's duplex mode to match the PHY. */
+		rl_phy_writereg(sc, PHY_BMCR, media);
+	} else {
+		if (verbose)
+			printf("no carrier\n");
+	}
+
+	rl_init(sc);
+
+	if (sc->rl_tx_pend) {
+		sc->rl_autoneg = 0;
+		sc->rl_tx_pend = 0;
+		rl_start(ifp);
+	}
+
+	return;
+}
+
+static void rl_getmode_mii(sc)
+	struct rl_softc		*sc;
+{
+	u_int16_t		bmsr;
+	struct ifnet		*ifp;
+
+	ifp = &sc->arpcom.ac_if;
+
+	bmsr = rl_phy_readreg(sc, PHY_BMSR);
+	if (bootverbose)
+		printf("rl%d: PHY status word: %x\n", sc->rl_unit, bmsr);
+
+	/* fallback */
+	sc->ifmedia.ifm_media = IFM_ETHER|IFM_10_T|IFM_HDX;
+
+	if (bmsr & PHY_BMSR_10BTHALF) {
+		if (bootverbose)
+			printf("rl%d: 10Mbps half-duplex mode supported\n",
+								sc->rl_unit);
+		ifmedia_add(&sc->ifmedia,
+			IFM_ETHER|IFM_10_T|IFM_HDX, 0, NULL);
+		ifmedia_add(&sc->ifmedia, IFM_ETHER|IFM_10_T, 0, NULL);
+	}
+
+	if (bmsr & PHY_BMSR_10BTFULL) {
+		if (bootverbose)
+			printf("rl%d: 10Mbps full-duplex mode supported\n",
+								sc->rl_unit);
+		ifmedia_add(&sc->ifmedia,
+			IFM_ETHER|IFM_10_T|IFM_FDX, 0, NULL);
+		sc->ifmedia.ifm_media = IFM_ETHER|IFM_10_T|IFM_FDX;
+	}
+
+	if (bmsr & PHY_BMSR_100BTXHALF) {
+		if (bootverbose)
+			printf("rl%d: 100Mbps half-duplex mode supported\n",
+								sc->rl_unit);
+		ifp->if_baudrate = 100000000;
+		ifmedia_add(&sc->ifmedia, IFM_ETHER|IFM_100_TX, 0, NULL);
+		ifmedia_add(&sc->ifmedia,
+			IFM_ETHER|IFM_100_TX|IFM_HDX, 0, NULL);
+		sc->ifmedia.ifm_media = IFM_ETHER|IFM_100_TX|IFM_HDX;
+	}
+
+	if (bmsr & PHY_BMSR_100BTXFULL) {
+		if (bootverbose)
+			printf("rl%d: 100Mbps full-duplex mode supported\n",
+								sc->rl_unit);
+		ifp->if_baudrate = 100000000;
+		ifmedia_add(&sc->ifmedia,
+			IFM_ETHER|IFM_100_TX|IFM_FDX, 0, NULL);
+		sc->ifmedia.ifm_media = IFM_ETHER|IFM_100_TX|IFM_FDX;
+	}
+
+	/* Some also support 100BaseT4. */
+	if (bmsr & PHY_BMSR_100BT4) {
+		if (bootverbose)
+			printf("rl%d: 100baseT4 mode supported\n", sc->rl_unit);
+		ifp->if_baudrate = 100000000;
+		ifmedia_add(&sc->ifmedia, IFM_ETHER|IFM_100_T4, 0, NULL);
+		sc->ifmedia.ifm_media = IFM_ETHER|IFM_100_T4;
+#ifdef FORCE_AUTONEG_TFOUR
+		if (bootverbose)
+			printf("rl%d: forcing on autoneg support for BT4\n",
+							 sc->rl_unit);
+		ifmedia_add(&sc->ifmedia, IFM_ETHER|IFM_AUTO, 0 NULL):
+		sc->ifmedia.ifm_media = IFM_ETHER|IFM_AUTO;
+#endif
+	}
+
+	if (bmsr & PHY_BMSR_CANAUTONEG) {
+		if (bootverbose)
+			printf("rl%d: autoneg supported\n", sc->rl_unit);
+		ifmedia_add(&sc->ifmedia, IFM_ETHER|IFM_AUTO, 0, NULL);
+		sc->ifmedia.ifm_media = IFM_ETHER|IFM_AUTO;
+	}
+
+	return;
+}
+
+/*
+ * Set speed and duplex mode.
+ */
+static void rl_setmode_mii(sc, media)
+	struct rl_softc		*sc;
+	int			media;
+{
+	u_int16_t		bmcr;
+
+	printf("rl%d: selecting MII, ", sc->rl_unit);
+
+	bmcr = rl_phy_readreg(sc, PHY_BMCR);
+
+	bmcr &= ~(PHY_BMCR_AUTONEGENBL|PHY_BMCR_SPEEDSEL|
+			PHY_BMCR_DUPLEX|PHY_BMCR_LOOPBK);
+
+	if (IFM_SUBTYPE(media) == IFM_100_T4) {
+		printf("100Mbps/T4, half-duplex\n");
+		bmcr |= PHY_BMCR_SPEEDSEL;
+		bmcr &= ~PHY_BMCR_DUPLEX;
+	}
+
+	if (IFM_SUBTYPE(media) == IFM_100_TX) {
+		printf("100Mbps, ");
+		bmcr |= PHY_BMCR_SPEEDSEL;
+	}
+
+	if (IFM_SUBTYPE(media) == IFM_10_T) {
+		printf("10Mbps, ");
+		bmcr &= ~PHY_BMCR_SPEEDSEL;
+	}
+
+	if ((media & IFM_GMASK) == IFM_FDX) {
+		printf("full duplex\n");
+		bmcr |= PHY_BMCR_DUPLEX;
+	} else {
+		printf("half duplex\n");
+		bmcr &= ~PHY_BMCR_DUPLEX;
+	}
+
+	rl_phy_writereg(sc, PHY_BMCR, bmcr);
+
+	return;
+}
+
+static void rl_reset(sc)
+	struct rl_softc		*sc;
+{
+	register int		i;
+
+	CSR_WRITE_1(sc, RL_COMMAND, RL_CMD_RESET);
+
+	for (i = 0; i < RL_TIMEOUT; i++) {
+		DELAY(10);
+		if (!(CSR_READ_1(sc, RL_COMMAND) & RL_CMD_RESET))
+			break;
+	}
+	if (i == RL_TIMEOUT)
+		printf("rl%d: reset never completed!\n", sc->rl_unit);
+
+        return;
+}
+
+/*
+ * Probe for a RealTek 8129/8139 chip. Check the PCI vendor and device
+ * IDs against our list and return a device name if we find a match.
+ */
+static char *
+rl_probe(config_id, device_id)
+	pcici_t			config_id;
+	pcidi_t			device_id;
+{
+	struct rl_type		*t;
+
+	t = rl_devs;
+
+	while(t->rl_name != NULL) {
+		if ((device_id & 0xFFFF) == t->rl_vid &&
+		    ((device_id >> 16) & 0xFFFF) == t->rl_did) {
+			return(t->rl_name);
+		}
+		t++;
+	}
+
+	return(NULL);
+}
+
+/*
+ * Attach the interface. Allocate softc structures, do ifmedia
+ * setup and ethernet/BPF attach.
+ */
+static void
+rl_attach(config_id, unit)
+	pcici_t			config_id;
+	int			unit;
+{
+	int			s, i;
+#ifndef RL_USEIOSPACE
+	vm_offset_t		pbase, vbase;
+#endif
+	u_char			eaddr[ETHER_ADDR_LEN];
+	u_int32_t		command;
+	struct rl_softc		*sc;
+	struct ifnet		*ifp;
+	int			media = IFM_ETHER|IFM_100_TX|IFM_FDX;
+	struct rl_type		*p;
+	u_int16_t		phy_vid, phy_did, phy_sts;
+	u_int16_t		rl_did = 0;
+
+	s = splimp();
+
+	sc = malloc(sizeof(struct rl_softc), M_DEVBUF, M_NOWAIT);
+	if (sc == NULL) {
+		printf("rl%d: no memory for softc struct!\n", unit);
+		return;
+	}
+	bzero(sc, sizeof(struct rl_softc));
+
+	/*
+	 * Handle power management nonsense.
+	 */
+
+	command = pci_conf_read(config_id, RL_PCI_CAPID) & 0x000000FF;
+	if (command == 0x01) {
+
+		command = pci_conf_read(config_id, RL_PCI_PWRMGMTCTRL);
+		if (command & RL_PSTATE_MASK) {
+			u_int32_t		iobase, membase, irq;
+
+			/* Save important PCI config data. */
+			iobase = pci_conf_read(config_id, RL_PCI_LOIO);
+			membase = pci_conf_read(config_id, RL_PCI_LOMEM);
+			irq = pci_conf_read(config_id, RL_PCI_INTLINE);
+
+			/* Reset the power state. */
+			printf("rl%d: chip is is in D%d power mode "
+			"-- setting to D0\n", unit, command & RL_PSTATE_MASK);
+			command &= 0xFFFFFFFC;
+			pci_conf_write(config_id, RL_PCI_PWRMGMTCTRL, command);
+
+			/* Restore PCI config data. */
+			pci_conf_write(config_id, RL_PCI_LOIO, iobase);
+			pci_conf_write(config_id, RL_PCI_LOMEM, membase);
+			pci_conf_write(config_id, RL_PCI_INTLINE, irq);
+		}
+	}
+
+	/*
+	 * Map control/status registers.
+	 */
+	command = pci_conf_read(config_id, PCI_COMMAND_STATUS_REG);
+	command |= (PCIM_CMD_PORTEN|PCIM_CMD_MEMEN|PCIM_CMD_BUSMASTEREN);
+	pci_conf_write(config_id, PCI_COMMAND_STATUS_REG, command);
+	command = pci_conf_read(config_id, PCI_COMMAND_STATUS_REG);
+
+#ifdef RL_USEIOSPACE
+	if (!(command & PCIM_CMD_PORTEN)) {
+		printf("rl%d: failed to enable I/O ports!\n", unit);
+		free(sc, M_DEVBUF);
+		goto fail;
+	}
+
+	sc->iobase = pci_conf_read(config_id, RL_PCI_LOIO) & 0xFFFFFFFC;
+#else
+	if (!(command & PCIM_CMD_MEMEN)) {
+		printf("rl%d: failed to enable memory mapping!\n", unit);
+		goto fail;
+	}
+
+	if (!pci_map_mem(config_id, RL_PCI_LOMEM, &vbase, &pbase)) {
+		printf ("rl%d: couldn't map memory\n", unit);
+		goto fail;
+	}
+	sc->csr = (volatile caddr_t)vbase;
+#endif
+
+	/* Allocate interrupt */
+	if (!pci_map_int(config_id, rl_intr, sc, &net_imask)) {
+		printf("rl%d: couldn't map interrupt\n", unit);
+		goto fail;
+	}
+
+	/* Reset the adapter. */
+	rl_reset(sc);
+
+	/*
+	 * Get station address from the EEPROM.
+	 */
+	rl_read_eeprom(sc, (caddr_t)&eaddr, RL_EE_EADDR, 3, 0);
+
+	/*
+	 * A RealTek chip was detected. Inform the world.
+	 */
+	printf("rl%d: Ethernet address: %6D\n", unit, eaddr, ":");
+
+	sc->rl_unit = unit;
+	bcopy(eaddr, (char *)&sc->arpcom.ac_enaddr, ETHER_ADDR_LEN);
+
+	/*
+	 * Now read the exact device type from the EEPROM to find
+	 * out if it's an 8129 or 8139.
+	 */
+	rl_read_eeprom(sc, (caddr_t)&rl_did, RL_EE_PCI_DID, 1, 0);
+
+	if (rl_did == RT_DEVICEID_8139)
+		sc->rl_type = RL_8139;
+	else if (rl_did == RT_DEVICEID_8129)
+		sc->rl_type = RL_8129;
+	else {
+		printf("rl%d: unknown device ID: %x\n", unit, rl_did);
+		free(sc, M_DEVBUF);
+		goto fail;
+	}
+
+	sc->rl_cdata.rl_rx_buf = contigmalloc(RL_RXBUFLEN + 16, M_DEVBUF,
+		M_NOWAIT, 0x100000, 0xffffffff, PAGE_SIZE, 0);
+
+	if (sc->rl_cdata.rl_rx_buf == NULL) {
+		free(sc, M_DEVBUF);
+		printf("rl%d: no memory for list buffers!\n", unit);
+		goto fail;
+	}
+
+	ifp = &sc->arpcom.ac_if;
+	ifp->if_softc = sc;
+	ifp->if_unit = unit;
+	ifp->if_name = "rl";
+	ifp->if_mtu = ETHERMTU;
+	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
+	ifp->if_ioctl = rl_ioctl;
+	ifp->if_output = ether_output;
+	ifp->if_start = rl_start;
+	ifp->if_watchdog = rl_watchdog;
+	ifp->if_init = rl_init;
+	ifp->if_baudrate = 10000000;
+
+	if (sc->rl_type == RL_8129) {
+		if (bootverbose)
+			printf("rl%d: probing for a PHY\n", sc->rl_unit);
+		for (i = RL_PHYADDR_MIN; i < RL_PHYADDR_MAX + 1; i++) {
+			if (bootverbose)
+				printf("rl%d: checking address: %d\n",
+							sc->rl_unit, i);
+			sc->rl_phy_addr = i;
+			rl_phy_writereg(sc, PHY_BMCR, PHY_BMCR_RESET);
+			DELAY(500);
+			while(rl_phy_readreg(sc, PHY_BMCR)
+					& PHY_BMCR_RESET);
+			if ((phy_sts = rl_phy_readreg(sc, PHY_BMSR)))
+				break;
+		}
+		if (phy_sts) {
+			phy_vid = rl_phy_readreg(sc, PHY_VENID);
+			phy_did = rl_phy_readreg(sc, PHY_DEVID);
+			if (bootverbose)
+				printf("rl%d: found PHY at address %d, ",
+						sc->rl_unit, sc->rl_phy_addr);
+			if (bootverbose)
+				printf("vendor id: %x device id: %x\n",
+					phy_vid, phy_did);
+			p = rl_phys;
+			while(p->rl_vid) {
+				if (phy_vid == p->rl_vid &&
+					(phy_did | 0x000F) == p->rl_did) {
+					sc->rl_pinfo = p;
+					break;
+				}
+				p++;
+			}
+			if (sc->rl_pinfo == NULL)
+				sc->rl_pinfo = &rl_phys[PHY_UNKNOWN];
+			if (bootverbose)
+				printf("rl%d: PHY type: %s\n",
+					sc->rl_unit, sc->rl_pinfo->rl_name);
+		} else {
+			printf("rl%d: MII without any phy!\n", sc->rl_unit);
+		}
+	}
+
+	/*
+	 * Do ifmedia setup.
+	 */
+	ifmedia_init(&sc->ifmedia, 0, rl_ifmedia_upd, rl_ifmedia_sts);
+
+	rl_getmode_mii(sc);
+
+	/* Choose a default media. */
+	media = IFM_ETHER|IFM_AUTO;
+	ifmedia_set(&sc->ifmedia, media);
+
+	rl_autoneg_mii(sc, RL_FLAG_FORCEDELAY, 1);
+
+	/*
+	 * Call MI attach routines.
+	 */
+	if_attach(ifp);
+	ether_ifattach(ifp);
+
+#if NBPFILTER > 0
+	bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header));
+#endif
+	at_shutdown(rl_shutdown, sc, SHUTDOWN_POST_SYNC);
+
+fail:
+	splx(s);
+	return;
+}
+
+/*
+ * Initialize the transmit descriptors.
+ */
+static int rl_list_tx_init(sc)
+	struct rl_softc		*sc;
+{
+	struct rl_chain_data	*cd;
+	int			i;
+
+	cd = &sc->rl_cdata;
+	for (i = 0; i < RL_TX_LIST_CNT; i++) {
+		cd->rl_tx_chain[i].rl_desc = i * 4;
+		CSR_WRITE_4(sc, RL_TXADDR0 + cd->rl_tx_chain[i].rl_desc, 0);
+		CSR_WRITE_4(sc, RL_TXSTAT0 + cd->rl_tx_chain[i].rl_desc, 0);
+		if (i == (RL_TX_LIST_CNT - 1))
+			cd->rl_tx_chain[i].rl_next = &cd->rl_tx_chain[0];
+		else
+			cd->rl_tx_chain[i].rl_next = &cd->rl_tx_chain[i + 1];
+	}
+
+	sc->rl_cdata.rl_tx_cnt = 0;
+	cd->rl_tx_cur = cd->rl_tx_free = &cd->rl_tx_chain[0];
+
+	return(0);
+}
+
+/*
+ * A frame has been uploaded: pass the resulting mbuf chain up to
+ * the higher level protocols.
+ *
+ * You know there's something wrong with a PCI bus-master chip design
+ * when you have to use m_devget().
+ *
+ * The receive operation is badly documented in the datasheet, so I'll
+ * attempt to document it here. The driver provides a buffer area and
+ * places its base address in the RX buffer start address register.
+ * The chip then begins copying frames into the RX buffer. Each frame
+ * is preceeded by a 32-bit RX status word which specifies the length
+ * of the frame and certain other status bits. Each frame (starting with
+ * the status word) is also 32-bit aligned. The frame length is in the
+ * first 16 bits of the status word; the lower 15 bits correspond with
+ * the 'rx status register' mentioned in the datasheet.
+ */
+static void rl_rxeof(sc)
+	struct rl_softc		*sc;
+{
+        struct ether_header	*eh;
+        struct mbuf		*m;
+        struct ifnet		*ifp;
+	int			total_len = 0;
+	u_int32_t		rxstat;
+	caddr_t			rxbufpos;
+	int			wrap = 0;
+	u_int16_t		cur_rx;
+	u_int16_t		limit;
+	u_int16_t		rx_bytes = 0, max_bytes;
+
+	ifp = &sc->arpcom.ac_if;
+
+	cur_rx = (CSR_READ_2(sc, RL_CURRXADDR) + 16) % RL_RXBUFLEN;
+
+	/* Do not try to read past this point. */
+	limit = CSR_READ_2(sc, RL_CURRXBUF) % RL_RXBUFLEN;
+
+	if (limit < cur_rx)
+		max_bytes = (RL_RXBUFLEN - cur_rx) + limit;
+	else
+		max_bytes = limit - cur_rx;
+
+	while((CSR_READ_1(sc, RL_COMMAND) & 1) == 0) {
+		rxbufpos = sc->rl_cdata.rl_rx_buf + cur_rx;
+		rxstat = *(u_int32_t *)rxbufpos;
+
+		/*
+		 * Here's a totally undocumented fact for you. When the
+		 * RealTek chip is in the process of copying a packet into
+		 * RAM for you, the length will be 0xfff0. If you spot a
+		 * packet header with this value, you need to stop. The
+		 * datasheet makes absolutely no mention of this and
+		 * RealTek should be shot for this.
+		 */
+		if ((u_int16_t)(rxstat >> 16) == RL_RXSTAT_UNFINISHED)
+			break;
+	
+		if (!(rxstat & RL_RXSTAT_RXOK)) {
+			ifp->if_ierrors++;
+			if (rxstat & (RL_RXSTAT_BADSYM|RL_RXSTAT_RUNT|
+					RL_RXSTAT_GIANT|RL_RXSTAT_CRCERR|
+					RL_RXSTAT_ALIGNERR)) {
+				CSR_WRITE_2(sc, RL_COMMAND, RL_CMD_TX_ENB);
+				CSR_WRITE_2(sc, RL_COMMAND, RL_CMD_TX_ENB|
+							RL_CMD_RX_ENB);
+				CSR_WRITE_4(sc, RL_RXCFG, RL_RXCFG_CONFIG);
+				CSR_WRITE_4(sc, RL_RXADDR,
+					vtophys(sc->rl_cdata.rl_rx_buf));
+				CSR_WRITE_2(sc, RL_CURRXADDR, cur_rx - 16);
+				cur_rx = 0;
+			}
+			break;
+		}
+
+		/* No errors; receive the packet. */	
+		total_len = rxstat >> 16;
+		rx_bytes += total_len + 4;
+
+		/*
+		 * Avoid trying to read more bytes than we know
+		 * the chip has prepared for us.
+		 */
+		if (rx_bytes > max_bytes)
+			break;
+
+		rxbufpos = sc->rl_cdata.rl_rx_buf +
+			((cur_rx + sizeof(u_int32_t)) % RL_RXBUFLEN);
+
+		if (rxbufpos == (sc->rl_cdata.rl_rx_buf + RL_RXBUFLEN))
+			rxbufpos = sc->rl_cdata.rl_rx_buf;
+
+		wrap = (sc->rl_cdata.rl_rx_buf + RL_RXBUFLEN) - rxbufpos;
+
+		if (total_len > wrap) {
+			m = m_devget(rxbufpos, wrap, 0, ifp, NULL);
+			if (m == NULL) {
+				ifp->if_ierrors++;
+				printf("rl%d: out of mbufs, tried to "
+					"copy %d bytes\n", sc->rl_unit, wrap);
+			}
+			else
+				m_copyback(m, wrap, total_len - wrap,
+					sc->rl_cdata.rl_rx_buf);
+			cur_rx = (total_len - wrap);
+		} else {
+			m = m_devget(rxbufpos, total_len, 0, ifp, NULL);
+			if (m == NULL) {
+				ifp->if_ierrors++;
+				printf("rl%d: out of mbufs, tried to "
+				"copy %d bytes\n", sc->rl_unit, total_len);
+			}
+			cur_rx += total_len + 4;
+		}
+
+		/*
+		 * Round up to 32-bit boundary.
+		 */
+		cur_rx = (cur_rx + 3) & ~3;
+		CSR_WRITE_2(sc, RL_CURRXADDR, cur_rx - 16);
+
+		if (m == NULL)
+			continue;
+
+		eh = mtod(m, struct ether_header *);
+		ifp->if_ipackets++;
+
+#if NBPFILTER > 0
+		/*
+		 * Handle BPF listeners. Let the BPF user see the packet, but
+		 * don't pass it up to the ether_input() layer unless it's
+		 * a broadcast packet, multicast packet, matches our ethernet
+		 * address or the interface is in promiscuous mode.
+		 */
+		if (ifp->if_bpf) {
+			bpf_mtap(ifp, m);
+			if (ifp->if_flags & IFF_PROMISC &&
+				(bcmp(eh->ether_dhost, sc->arpcom.ac_enaddr,
+						ETHER_ADDR_LEN) &&
+					(eh->ether_dhost[0] & 1) == 0)) {
+				m_freem(m);
+				continue;
+			}
+		}
+#endif
+		/* Remove header from mbuf and pass it on. */
+		m_adj(m, sizeof(struct ether_header));
+		ether_input(ifp, eh, m);
+	}
+
+	return;
+}
+
+/*
+ * A frame was downloaded to the chip. It's safe for us to clean up
+ * the list buffers.
+ */
+static void rl_txeof(sc)
+	struct rl_softc		*sc;
+{
+	struct rl_chain		*cur_tx;
+	struct ifnet		*ifp;
+	u_int32_t		txstat;
+
+	ifp = &sc->arpcom.ac_if;
+
+	/* Clear the timeout timer. */
+	ifp->if_timer = 0;
+
+	/*
+	 * Go through our tx list and free mbufs for those
+	 * frames that have been uploaded.
+	 */
+	if (sc->rl_cdata.rl_tx_free == NULL)
+		return;
+
+	while(sc->rl_cdata.rl_tx_free->rl_mbuf != NULL) {
+		cur_tx = sc->rl_cdata.rl_tx_free;
+		txstat = CSR_READ_4(sc, RL_TXSTAT0 + cur_tx->rl_desc);
+
+		if (!(txstat & RL_TXSTAT_TX_OK))
+			break;
+
+		if (txstat & RL_TXSTAT_COLLCNT)
+			ifp->if_collisions +=
+					(txstat & RL_TXSTAT_COLLCNT) >> 24;
+
+		sc->rl_cdata.rl_tx_free = cur_tx->rl_next;
+
+		sc->rl_cdata.rl_tx_cnt--;
+		m_freem(cur_tx->rl_mbuf);
+		cur_tx->rl_mbuf = NULL;
+		ifp->if_opackets++;
+	}
+
+	if (!sc->rl_cdata.rl_tx_cnt) {
+		ifp->if_flags &= ~IFF_OACTIVE;
+		if (sc->rl_want_auto)
+			rl_autoneg_mii(sc, RL_FLAG_SCHEDDELAY, 1);
+	} else {
+		if (ifp->if_snd.ifq_head != NULL)
+			rl_start(ifp);
+	}
+
+	return;
+}
+
+/*
+ * TX error handler.
+ */
+static void rl_txeoc(sc)
+	struct rl_softc		*sc;
+{
+	u_int32_t		txstat;
+	struct rl_chain		*cur_tx;
+	struct ifnet		*ifp;
+
+	ifp = &sc->arpcom.ac_if;
+
+	if (sc->rl_cdata.rl_tx_free == NULL)
+		return;
+
+	while(sc->rl_cdata.rl_tx_free->rl_mbuf != NULL) {
+		cur_tx = sc->rl_cdata.rl_tx_free;
+		txstat = CSR_READ_4(sc, RL_TXSTAT0 + cur_tx->rl_desc);
+
+		if (!(txstat & RL_TXSTAT_OWN))
+			break;
+
+		if (!(txstat & RL_TXSTAT_TX_OK)) {
+			ifp->if_oerrors++;
+			if (txstat & RL_TXSTAT_COLLCNT)
+				ifp->if_collisions +=
+					(txstat & RL_TXSTAT_COLLCNT) >> 24;
+			CSR_WRITE_4(sc, RL_TXADDR0 + cur_tx->rl_desc,
+				vtophys(mtod(cur_tx->rl_mbuf, caddr_t)));
+			CSR_WRITE_4(sc, RL_TXSTAT0 + cur_tx->rl_desc,
+				RL_TX_EARLYTHRESH |
+					cur_tx->rl_mbuf->m_pkthdr.len);
+			break;
+		} else {
+			if (txstat & RL_TXSTAT_COLLCNT)
+				ifp->if_collisions +=
+					(txstat & RL_TXSTAT_COLLCNT) >> 24;
+			sc->rl_cdata.rl_tx_free = cur_tx->rl_next;
+
+			sc->rl_cdata.rl_tx_cnt--;
+			m_freem(cur_tx->rl_mbuf);
+			cur_tx->rl_mbuf = NULL;
+			ifp->if_opackets++;
+		}
+	}
+
+	return;
+}
+
+static void rl_intr(arg)
+	void			*arg;
+{
+	struct rl_softc		*sc;
+	struct ifnet		*ifp;
+	u_int16_t		status;
+
+	sc = arg;
+	ifp = &sc->arpcom.ac_if;
+
+	/* Disable interrupts. */
+	CSR_WRITE_2(sc, RL_IMR, 0x0000);
+
+	for (;;) {
+
+		status = CSR_READ_2(sc, RL_ISR);
+		if (status)
+			CSR_WRITE_2(sc, RL_ISR, status);
+
+		if ((status & RL_INTRS) == 0)
+			break;
+
+		if (status & RL_ISR_RX_OK)
+			rl_rxeof(sc);
+
+		if (status & RL_ISR_RX_ERR)
+			rl_rxeof(sc);
+
+		if (status & RL_ISR_TX_OK)
+			rl_txeof(sc);
+
+		if (status & RL_ISR_TX_ERR)
+			rl_txeoc(sc);
+
+		if (status & RL_ISR_SYSTEM_ERR) {
+			rl_reset(sc);
+			rl_init(sc);
+		}
+
+	}
+
+	/* Re-enable interrupts. */
+	CSR_WRITE_2(sc, RL_IMR, RL_INTRS);
+
+	if (ifp->if_snd.ifq_head != NULL) {
+		rl_start(ifp);
+	}
+
+	return;
+}
+
+/*
+ * Encapsulate an mbuf chain in a descriptor by coupling the mbuf data
+ * pointers to the fragment pointers.
+ */
+static int rl_encap(sc, c, m_head)
+	struct rl_softc		*sc;
+	struct rl_chain		*c;
+	struct mbuf		*m_head;
+{
+	struct mbuf		*m;
+
+	/*
+	 * There are two possible encapsulation mechanisms
+	 * that we can use: an efficient one, and a very lossy
+	 * one. The efficient one only happens very rarely,
+	 * whereas the lossy one can and most likely will happen
+	 * all the time.
+	 * The efficient case happens if:
+	 * - the packet fits in a single mbuf
+	 * - the packet is 32-bit aligned within the mbuf data area
+	 * In this case, we can DMA from the mbuf directly.
+	 * The lossy case covers everything else. Bah.
+	 */
+
+	m = m_head;
+
+	if (m->m_pkthdr.len > MHLEN || (mtod(m, u_int32_t) & 0x00000003)) {
+		struct mbuf		*m_new = NULL;
+
+		MGETHDR(m_new, M_DONTWAIT, MT_DATA);
+		if (m_new == NULL) {
+			printf("rl%d: no memory for tx list", sc->rl_unit);
+			return(1);
+		}
+		if (m_head->m_pkthdr.len > MHLEN) {
+			MCLGET(m_new, M_DONTWAIT);
+			if (!(m_new->m_flags & M_EXT)) {
+				m_freem(m_new);
+				printf("rl%d: no memory for tx list",
+						sc->rl_unit);
+				return(1);
+			}
+		}
+		m_copydata(m_head, 0, m_head->m_pkthdr.len,	
+					mtod(m_new, caddr_t));
+		m_new->m_pkthdr.len = m_new->m_len = m_head->m_pkthdr.len;
+		m_freem(m_head);
+		m_head = m_new;
+	}
+
+	/* Pad frames to at least 60 bytes. */
+	if (m_head->m_pkthdr.len < RL_MIN_FRAMELEN)
+		m_head->m_pkthdr.len +=
+			(RL_MIN_FRAMELEN - m_head->m_pkthdr.len);
+
+	c->rl_mbuf = m_head;
+
+	return(0);
+}
+
+/*
+ * Main transmit routine.
+ */
+
+static void rl_start(ifp)
+	struct ifnet		*ifp;
+{
+	struct rl_softc		*sc;
+	struct mbuf		*m_head = NULL;
+	struct rl_chain		*cur_tx = NULL;
+
+	sc = ifp->if_softc;
+
+	if (sc->rl_autoneg) {
+		sc->rl_tx_pend = 1;
+		return;
+	}
+
+	/*
+	 * Check for an available queue slot. If there are none,
+	 * punt.
+	 */
+	if (sc->rl_cdata.rl_tx_cur->rl_mbuf != NULL) {
+		ifp->if_flags |= IFF_OACTIVE;
+		return;
+	}
+
+	while(sc->rl_cdata.rl_tx_cur->rl_mbuf == NULL) {
+		IF_DEQUEUE(&ifp->if_snd, m_head);
+		if (m_head == NULL)
+			break;
+
+
+		/* Pick a descriptor off the free list. */
+		cur_tx = sc->rl_cdata.rl_tx_cur;
+		sc->rl_cdata.rl_tx_cur = cur_tx->rl_next;
+		sc->rl_cdata.rl_tx_cnt++;
+
+		/* Pack the data into the descriptor. */
+		rl_encap(sc, cur_tx, m_head);
+
+#if NBPFILTER > 0
+		/*
+		 * If there's a BPF listener, bounce a copy of this frame
+		 * to him.
+		 */
+		if (ifp->if_bpf)
+			bpf_mtap(ifp, cur_tx->rl_mbuf);
+#endif
+		/*
+		 * Transmit the frame.
+	 	 */
+		CSR_WRITE_4(sc, RL_TXADDR0 + cur_tx->rl_desc,
+				vtophys(mtod(cur_tx->rl_mbuf, caddr_t)));
+		CSR_WRITE_4(sc, RL_TXSTAT0 + cur_tx->rl_desc,
+			RL_TX_EARLYTHRESH | cur_tx->rl_mbuf->m_pkthdr.len);
+	}
+
+	/*
+	 * Set a timeout in case the chip goes out to lunch.
+	 */
+	ifp->if_timer = 5;
+
+	return;
+}
+
+static void rl_init(xsc)
+	void			*xsc;
+{
+	struct rl_softc		*sc = xsc;
+	struct ifnet		*ifp = &sc->arpcom.ac_if;
+	int			s, i;
+	u_int32_t		rxcfg = 0;
+	u_int16_t		phy_bmcr = 0;
+
+	if (sc->rl_autoneg)
+		return;
+
+	s = splimp();
+
+	/*
+	 * XXX Hack for the 8139: the built-in autoneg logic's state
+	 * gets reset by rl_init() when we don't want it to. Try
+	 * to preserve it. (For 8129 cards with real external PHYs,
+	 * the BMCR register doesn't change, but this doesn't hurt.)
+	 */
+	if (sc->rl_type == RL_8139)
+		phy_bmcr = rl_phy_readreg(sc, PHY_BMCR);
+
+	/*
+	 * Cancel pending I/O and free all RX/TX buffers.
+	 */
+	rl_stop(sc);
+
+	/* Init our MAC address */
+	for (i = 0; i < ETHER_ADDR_LEN; i++) {
+		CSR_WRITE_1(sc, RL_IDR0 + i, sc->arpcom.ac_enaddr[i]);
+	}
+
+	/* Init the RX buffer pointer register. */
+	CSR_WRITE_4(sc, RL_RXADDR, vtophys(sc->rl_cdata.rl_rx_buf));
+
+	/* Init TX descriptors. */
+	rl_list_tx_init(sc);
+
+	/*
+	 * Enable transmit and receive.
+	 */
+	CSR_WRITE_1(sc, RL_COMMAND, RL_CMD_TX_ENB|RL_CMD_RX_ENB);
+
+	/*
+	 * Set the buffer size values.
+	 */
+	CSR_WRITE_4(sc, RL_RXCFG, RL_RXCFG_CONFIG);
+
+	/* Set the individual bit to receive frames for this host only. */
+	rxcfg = CSR_READ_4(sc, RL_RXCFG);
+	rxcfg |= RL_RXCFG_RX_INDIV;
+
+	/* If we want promiscuous mode, set the allframes bit. */
+	if (ifp->if_flags & IFF_PROMISC) {
+		rxcfg |= RL_RXCFG_RX_ALLPHYS;
+		CSR_WRITE_4(sc, RL_RXCFG, rxcfg);
+	} else {
+		rxcfg &= ~RL_RXCFG_RX_ALLPHYS;
+		CSR_WRITE_4(sc, RL_RXCFG, rxcfg);
+	}
+
+	/*
+	 * Set capture broadcast bit to capture broadcast frames.
+	 */
+	if (ifp->if_flags & IFF_BROADCAST) {
+		rxcfg |= RL_RXCFG_RX_BROAD;
+		CSR_WRITE_4(sc, RL_RXCFG, rxcfg);
+	} else {
+		rxcfg &= ~RL_RXCFG_RX_BROAD;
+		CSR_WRITE_4(sc, RL_RXCFG, rxcfg);
+	}
+
+	/*
+	 * Program the multicast filter, if necessary.
+	 */
+	rl_setmulti(sc);
+
+	/*
+	 * Enable interrupts.
+	 */
+	CSR_WRITE_2(sc, RL_IMR, RL_INTRS);
+
+	/* Start RX/TX process. */
+	CSR_WRITE_4(sc, RL_MISSEDPKT, 0);
+
+	/* Enable receiver and transmitter. */
+	CSR_WRITE_1(sc, RL_COMMAND, RL_CMD_TX_ENB|RL_CMD_RX_ENB);
+
+	/* Restore state of BMCR */
+	if (sc->rl_pinfo != NULL)
+		rl_phy_writereg(sc, PHY_BMCR, phy_bmcr);
+
+	CSR_WRITE_1(sc, RL_CFG1, RL_CFG1_DRVLOAD|RL_CFG1_FULLDUPLEX);
+
+	ifp->if_flags |= IFF_RUNNING;
+	ifp->if_flags &= ~IFF_OACTIVE;
+
+	(void)splx(s);
+
+	return;
+}
+
+/*
+ * Set media options.
+ */
+static int rl_ifmedia_upd(ifp)
+	struct ifnet		*ifp;
+{
+	struct rl_softc		*sc;
+	struct ifmedia		*ifm;
+
+	sc = ifp->if_softc;
+	ifm = &sc->ifmedia;
+
+	if (IFM_TYPE(ifm->ifm_media) != IFM_ETHER)
+		return(EINVAL);
+
+	if (IFM_SUBTYPE(ifm->ifm_media) == IFM_AUTO)
+		rl_autoneg_mii(sc, RL_FLAG_SCHEDDELAY, 1);
+	else
+		rl_setmode_mii(sc, ifm->ifm_media);
+
+	return(0);
+}
+
+/*
+ * Report current media status.
+ */
+static void rl_ifmedia_sts(ifp, ifmr)
+	struct ifnet		*ifp;
+	struct ifmediareq	*ifmr;
+{
+	struct rl_softc		*sc;
+	u_int16_t		advert = 0, ability = 0;
+
+	sc = ifp->if_softc;
+
+	if (!(rl_phy_readreg(sc, PHY_BMCR) & PHY_BMCR_AUTONEGENBL)) {
+		if (rl_phy_readreg(sc, PHY_BMCR) & PHY_BMCR_SPEEDSEL)
+			ifmr->ifm_active = IFM_ETHER|IFM_100_TX;
+		else
+			ifmr->ifm_active = IFM_ETHER|IFM_10_T;
+	
+		if (rl_phy_readreg(sc, PHY_BMCR) & PHY_BMCR_DUPLEX)
+			ifmr->ifm_active |= IFM_FDX;
+		else
+			ifmr->ifm_active |= IFM_HDX;
+		return;
+	}
+
+	ability = rl_phy_readreg(sc, PHY_LPAR);
+	advert = rl_phy_readreg(sc, PHY_ANAR);
+	if (advert & PHY_ANAR_100BT4 &&
+		ability & PHY_ANAR_100BT4) {
+		ifmr->ifm_active = IFM_ETHER|IFM_100_T4;
+	} else if (advert & PHY_ANAR_100BTXFULL &&
+		ability & PHY_ANAR_100BTXFULL) {
+		ifmr->ifm_active = IFM_ETHER|IFM_100_TX|IFM_FDX;
+	} else if (advert & PHY_ANAR_100BTXHALF &&
+		ability & PHY_ANAR_100BTXHALF) {
+		ifmr->ifm_active = IFM_ETHER|IFM_100_TX|IFM_HDX;
+	} else if (advert & PHY_ANAR_10BTFULL &&
+		ability & PHY_ANAR_10BTFULL) {
+		ifmr->ifm_active = IFM_ETHER|IFM_10_T|IFM_FDX;
+	} else if (advert & PHY_ANAR_10BTHALF &&
+		ability & PHY_ANAR_10BTHALF) {
+		ifmr->ifm_active = IFM_ETHER|IFM_10_T|IFM_HDX;
+	}
+
+	return;
+}
+
+static int rl_ioctl(ifp, command, data)
+	struct ifnet		*ifp;
+	u_long			command;
+	caddr_t			data;
+{
+	struct rl_softc		*sc = ifp->if_softc;
+	struct ifreq		*ifr = (struct ifreq *) data;
+	int			s, error = 0;
+
+	s = splimp();
+
+	switch(command) {
+	case SIOCSIFADDR:
+	case SIOCGIFADDR:
+	case SIOCSIFMTU:
+		error = ether_ioctl(ifp, command, data);
+		break;
+	case SIOCSIFFLAGS:
+		if (ifp->if_flags & IFF_UP) {
+			rl_init(sc);
+		} else {
+			if (ifp->if_flags & IFF_RUNNING)
+				rl_stop(sc);
+		}
+		error = 0;
+		break;
+	case SIOCADDMULTI:
+	case SIOCDELMULTI:
+		rl_setmulti(sc);
+		error = 0;
+		break;
+	case SIOCGIFMEDIA:
+	case SIOCSIFMEDIA:
+		error = ifmedia_ioctl(ifp, ifr, &sc->ifmedia, command);
+		break;
+	default:
+		error = EINVAL;
+		break;
+	}
+
+	(void)splx(s);
+
+	return(error);
+}
+
+static void rl_watchdog(ifp)
+	struct ifnet		*ifp;
+{
+	struct rl_softc		*sc;
+
+	sc = ifp->if_softc;
+
+	if (sc->rl_autoneg) {
+		rl_autoneg_mii(sc, RL_FLAG_DELAYTIMEO, 1);
+		return;
+	}
+
+	printf("rl%d: watchdog timeout\n", sc->rl_unit);
+	ifp->if_oerrors++;
+	if (!(rl_phy_readreg(sc, PHY_BMSR) & PHY_BMSR_LINKSTAT))
+		printf("rl%d: no carrier - transceiver cable problem?\n",
+								sc->rl_unit);
+	rl_txeoc(sc);
+	rl_txeof(sc);
+	rl_rxeof(sc);
+	rl_init(sc);
+
+	return;
+}
+
+/*
+ * Stop the adapter and free any mbufs allocated to the
+ * RX and TX lists.
+ */
+static void rl_stop(sc)
+	struct rl_softc		*sc;
+{
+	register int		i;
+	struct ifnet		*ifp;
+
+	ifp = &sc->arpcom.ac_if;
+	ifp->if_timer = 0;
+
+	CSR_WRITE_1(sc, RL_COMMAND, 0x00);
+	CSR_WRITE_2(sc, RL_IMR, 0x0000);
+
+	/*
+	 * Free the TX list buffers.
+	 */
+	for (i = 0; i < RL_TX_LIST_CNT; i++) {
+		if (sc->rl_cdata.rl_tx_chain[i].rl_mbuf != NULL) {
+			m_freem(sc->rl_cdata.rl_tx_chain[i].rl_mbuf);
+			sc->rl_cdata.rl_tx_chain[i].rl_mbuf = NULL;
+			CSR_WRITE_4(sc, RL_TXADDR0 +
+			sc->rl_cdata.rl_tx_chain[i].rl_desc, 0x00000000);
+		}
+	}
+
+	ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
+
+	return;
+}
+
+/*
+ * Stop all chip I/O so that the kernel's probe routines don't
+ * get confused by errant DMAs when rebooting.
+ */
+static void rl_shutdown(howto, arg)
+	int			howto;
+	void			*arg;
+{
+	struct rl_softc		*sc = (struct rl_softc *)arg;
+
+	rl_stop(sc);
+
+	return;
+}
+
+
+static struct pci_device rl_device = {
+	"rl",
+	rl_probe,
+	rl_attach,
+	&rl_count,
+	NULL
+};
+DATA_SET(pcidevice_set, rl_device);