diff --git a/drivers/net/rtl8139.c b/drivers/net/rtl8139.c
index bb59629..9898f20 100644
--- a/drivers/net/rtl8139.c
+++ b/drivers/net/rtl8139.c
@@ -99,77 +99,96 @@
 #define phys_to_bus(a)	pci_phys_to_mem((pci_dev_t)dev->priv, a)
 
 /* Symbolic offsets to registers. */
-enum RTL8139_registers {
-	MAC0=0,			/* Ethernet hardware address. */
-	MAR0=8,			/* Multicast filter. */
-	TxStatus0=0x10,		/* Transmit status (four 32bit registers). */
-	TxAddr0=0x20,		/* Tx descriptors (also four 32bit). */
-	RxBuf=0x30, RxEarlyCnt=0x34, RxEarlyStatus=0x36,
-	ChipCmd=0x37, RxBufPtr=0x38, RxBufAddr=0x3A,
-	IntrMask=0x3C, IntrStatus=0x3E,
-	TxConfig=0x40, RxConfig=0x44,
-	Timer=0x48,		/* general-purpose counter. */
-	RxMissed=0x4C,		/* 24 bits valid, write clears. */
-	Cfg9346=0x50, Config0=0x51, Config1=0x52,
-	TimerIntrReg=0x54,	/* intr if gp counter reaches this value */
-	MediaStatus=0x58,
-	Config3=0x59,
-	MultiIntr=0x5C,
-	RevisionID=0x5E,	/* revision of the RTL8139 chip */
-	TxSummary=0x60,
-	MII_BMCR=0x62, MII_BMSR=0x64, NWayAdvert=0x66, NWayLPAR=0x68,
-	NWayExpansion=0x6A,
-	DisconnectCnt=0x6C, FalseCarrierCnt=0x6E,
-	NWayTestReg=0x70,
-	RxCnt=0x72,		/* packet received counter */
-	CSCR=0x74,		/* chip status and configuration register */
-	PhyParm1=0x78,TwisterParm=0x7c,PhyParm2=0x80,	/* undocumented */
-	/* from 0x84 onwards are a number of power management/wakeup frame
-	 * definitions we will probably never need to know about.  */
-};
+/* Ethernet hardware address. */
+#define RTL_REG_MAC0				0x00
+/* Multicast filter. */
+#define RTL_REG_MAR0				0x08
+/* Transmit status (four 32bit registers). */
+#define RTL_REG_TXSTATUS0			0x10
+/* Tx descriptors (also four 32bit). */
+#define RTL_REG_TXADDR0				0x20
+#define RTL_REG_RXBUF				0x30
+#define RTL_REG_RXEARLYCNT			0x34
+#define RTL_REG_RXEARLYSTATUS			0x36
+#define RTL_REG_CHIPCMD				0x37
+#define RTL_REG_CHIPCMD_CMDRESET		BIT(4)
+#define RTL_REG_CHIPCMD_CMDRXENB		BIT(3)
+#define RTL_REG_CHIPCMD_CMDTXENB		BIT(2)
+#define RTL_REG_CHIPCMD_RXBUFEMPTY		BIT(0)
+#define RTL_REG_RXBUFPTR			0x38
+#define RTL_REG_RXBUFADDR			0x3A
+#define RTL_REG_INTRMASK			0x3C
+#define RTL_REG_INTRSTATUS			0x3E
+#define RTL_REG_INTRSTATUS_PCIERR		BIT(15)
+#define RTL_REG_INTRSTATUS_PCSTIMEOUT		BIT(14)
+#define RTL_REG_INTRSTATUS_CABLELENCHANGE	BIT(13)
+#define RTL_REG_INTRSTATUS_RXFIFOOVER		BIT(6)
+#define RTL_REG_INTRSTATUS_RXUNDERRUN		BIT(5)
+#define RTL_REG_INTRSTATUS_RXOVERFLOW		BIT(4)
+#define RTL_REG_INTRSTATUS_TXERR		BIT(3)
+#define RTL_REG_INTRSTATUS_TXOK			BIT(2)
+#define RTL_REG_INTRSTATUS_RXERR		BIT(1)
+#define RTL_REG_INTRSTATUS_RXOK			BIT(0)
+#define RTL_REG_TXCONFIG			0x40
+#define RTL_REG_RXCONFIG			0x44
+#define RTL_REG_RXCONFIG_RXCFGWRAP		BIT(7)
+#define RTL_REG_RXCONFIG_ACCEPTERR		BIT(5)
+#define RTL_REG_RXCONFIG_ACCEPTRUNT		BIT(4)
+#define RTL_REG_RXCONFIG_ACCEPTBROADCAST	BIT(3)
+#define RTL_REG_RXCONFIG_ACCEPTMULTICAST	BIT(2)
+#define RTL_REG_RXCONFIG_ACCEPTMYPHYS		BIT(1)
+#define RTL_REG_RXCONFIG_ACCEPTALLPHYS		BIT(0)
+/* general-purpose counter. */
+#define RTL_REG_TIMER				0x48
+/* 24 bits valid, write clears. */
+#define RTL_REG_RXMISSED			0x4C
+#define RTL_REG_CFG9346				0x50
+#define RTL_REG_CONFIG0				0x51
+#define RTL_REG_CONFIG1				0x52
+/* intr if gp counter reaches this value */
+#define RTL_REG_TIMERINTRREG			0x54
+#define RTL_REG_MEDIASTATUS			0x58
+#define RTL_REG_MEDIASTATUS_MSRTXFLOWENABLE	BIT(7)
+#define RTL_REG_MEDIASTATUS_MSRRXFLOWENABLE	BIT(6)
+#define RTL_REG_MEDIASTATUS_MSRSPEED10		BIT(3)
+#define RTL_REG_MEDIASTATUS_MSRLINKFAIL		BIT(2)
+#define RTL_REG_MEDIASTATUS_MSRRXPAUSEFLAG	BIT(1)
+#define RTL_REG_MEDIASTATUS_MSRTXPAUSEFLAG	BIT(0)
+#define RTL_REG_CONFIG3				0x59
+#define RTL_REG_MULTIINTR			0x5C
+/* revision of the RTL8139 chip */
+#define RTL_REG_REVISIONID			0x5E
+#define RTL_REG_TXSUMMARY			0x60
+#define RTL_REG_MII_BMCR			0x62
+#define RTL_REG_MII_BMSR			0x64
+#define RTL_REG_NWAYADVERT			0x66
+#define RTL_REG_NWAYLPAR			0x68
+#define RTL_REG_NWAYEXPANSION			0x6A
+#define RTL_REG_DISCONNECTCNT			0x6C
+#define RTL_REG_FALSECARRIERCNT			0x6E
+#define RTL_REG_NWAYTESTREG			0x70
+/* packet received counter */
+#define RTL_REG_RXCNT				0x72
+/* chip status and configuration register */
+#define RTL_REG_CSCR				0x74
+#define RTL_REG_PHYPARM1			0x78
+#define RTL_REG_TWISTERPARM			0x7c
+/* undocumented */
+#define RTL_REG_PHYPARM2			0x80
+/*
+ * from 0x84 onwards are a number of power management/wakeup frame
+ * definitions we will probably never need to know about.
+ */
 
-enum ChipCmdBits {
-	CmdReset=0x10, CmdRxEnb=0x08, CmdTxEnb=0x04, RxBufEmpty=0x01, };
-
-/* Interrupt register bits, using my own meaningful names. */
-enum IntrStatusBits {
-	PCIErr=0x8000, PCSTimeout=0x4000, CableLenChange= 0x2000,
-	RxFIFOOver=0x40, RxUnderrun=0x20, RxOverflow=0x10,
-	TxErr=0x08, TxOK=0x04, RxErr=0x02, RxOK=0x01,
-};
-enum TxStatusBits {
-	TxHostOwns=0x2000, TxUnderrun=0x4000, TxStatOK=0x8000,
-	TxOutOfWindow=0x20000000, TxAborted=0x40000000,
-	TxCarrierLost=0x80000000,
-};
-enum RxStatusBits {
-	RxMulticast=0x8000, RxPhysical=0x4000, RxBroadcast=0x2000,
-	RxBadSymbol=0x0020, RxRunt=0x0010, RxTooLong=0x0008, RxCRCErr=0x0004,
-	RxBadAlign=0x0002, RxStatusOK=0x0001,
-};
-
-enum MediaStatusBits {
-	MSRTxFlowEnable=0x80, MSRRxFlowEnable=0x40, MSRSpeed10=0x08,
-	MSRLinkFail=0x04, MSRRxPauseFlag=0x02, MSRTxPauseFlag=0x01,
-};
-
-enum MIIBMCRBits {
-	BMCRReset=0x8000, BMCRSpeed100=0x2000, BMCRNWayEnable=0x1000,
-	BMCRRestartNWay=0x0200, BMCRDuplex=0x0100,
-};
-
-enum CSCRBits {
-	CSCR_LinkOKBit=0x0400, CSCR_LinkChangeBit=0x0800,
-	CSCR_LinkStatusBits=0x0f000, CSCR_LinkDownOffCmd=0x003c0,
-	CSCR_LinkDownCmd=0x0f3c0,
-};
-
-/* Bits in RxConfig. */
-enum rx_mode_bits {
-	RxCfgWrap=0x80,
-	AcceptErr=0x20, AcceptRunt=0x10, AcceptBroadcast=0x08,
-	AcceptMulticast=0x04, AcceptMyPhys=0x02, AcceptAllPhys=0x01,
-};
+#define RTL_STS_RXMULTICAST			BIT(15)
+#define RTL_STS_RXPHYSICAL			BIT(14)
+#define RTL_STS_RXBROADCAST			BIT(13)
+#define RTL_STS_RXBADSYMBOL			BIT(5)
+#define RTL_STS_RXRUNT				BIT(4)
+#define RTL_STS_RXTOOLONG			BIT(3)
+#define RTL_STS_RXCRCERR			BIT(2)
+#define RTL_STS_RXBADALIGN			BIT(1)
+#define RTL_STS_RXSTATUSOK			BIT(0)
 
 static int ioaddr;
 static unsigned int cur_rx,cur_tx;
@@ -251,7 +270,7 @@
 	ioaddr = dev->iobase;
 
 	/* Bring the chip out of low-power mode. */
-	outb(0x00, ioaddr + Config1);
+	outb(0x00, ioaddr + RTL_REG_CONFIG1);
 
 	addr_len = read_eeprom(0,8) == 0x8129 ? 8 : 6;
 	for (i = 0; i < 3; i++)
@@ -259,7 +278,7 @@
 
 	rtl_reset(dev);
 
-	if (inb(ioaddr + MediaStatus) & MSRLinkFail) {
+	if (inb(ioaddr + RTL_REG_MEDIASTATUS) & RTL_REG_MEDIASTATUS_MSRLINKFAIL) {
 		printf("Cable not connected or other link failure\n");
 		return -1 ;
 	}
@@ -286,15 +305,15 @@
 #define eeprom_delay()	inl(ee_addr)
 
 /* The EEPROM commands include the alway-set leading bit. */
-#define EE_WRITE_CMD	(5)
-#define EE_READ_CMD	(6)
-#define EE_ERASE_CMD	(7)
+#define EE_WRITE_CMD	5
+#define EE_READ_CMD	6
+#define EE_ERASE_CMD	7
 
 static int read_eeprom(int location, int addr_len)
 {
 	int i;
 	unsigned int retval = 0;
-	long ee_addr = ioaddr + Cfg9346;
+	long ee_addr = ioaddr + RTL_REG_CFG9346;
 	int read_cmd = location | (EE_READ_CMD << addr_len);
 
 	outb(EE_ENB & ~EE_CS, ee_addr);
@@ -335,41 +354,46 @@
 	unsigned int mc_filter[2];
 	int rx_mode;
 	/* !IFF_PROMISC */
-	rx_mode = AcceptBroadcast | AcceptMulticast | AcceptMyPhys;
+	rx_mode = RTL_REG_RXCONFIG_ACCEPTBROADCAST |
+		  RTL_REG_RXCONFIG_ACCEPTMULTICAST |
+		  RTL_REG_RXCONFIG_ACCEPTMYPHYS;
 	mc_filter[1] = mc_filter[0] = 0xffffffff;
 
-	outl(rtl8139_rx_config | rx_mode, ioaddr + RxConfig);
+	outl(rtl8139_rx_config | rx_mode, ioaddr + RTL_REG_RXCONFIG);
 
-	outl(mc_filter[0], ioaddr + MAR0 + 0);
-	outl(mc_filter[1], ioaddr + MAR0 + 4);
+	outl(mc_filter[0], ioaddr + RTL_REG_MAR0 + 0);
+	outl(mc_filter[1], ioaddr + RTL_REG_MAR0 + 4);
 }
 
 static void rtl_reset(struct eth_device *dev)
 {
 	int i;
 
-	outb(CmdReset, ioaddr + ChipCmd);
+	outb(RTL_REG_CHIPCMD_CMDRESET, ioaddr + RTL_REG_CHIPCMD);
 
 	cur_rx = 0;
 	cur_tx = 0;
 
 	/* Give the chip 10ms to finish the reset. */
 	for (i=0; i<100; ++i){
-		if ((inb(ioaddr + ChipCmd) & CmdReset) == 0) break;
+		if ((inb(ioaddr + RTL_REG_CHIPCMD) &
+		     RTL_REG_CHIPCMD_CMDRESET) == 0)
+			break;
 		udelay (100); /* wait 100us */
 	}
 
 
 	for (i = 0; i < ETH_ALEN; i++)
-		outb(dev->enetaddr[i], ioaddr + MAC0 + i);
+		outb(dev->enetaddr[i], ioaddr + RTL_REG_MAC0 + i);
 
 	/* Must enable Tx/Rx before setting transfer thresholds! */
-	outb(CmdRxEnb | CmdTxEnb, ioaddr + ChipCmd);
+	outb(RTL_REG_CHIPCMD_CMDRXENB | RTL_REG_CHIPCMD_CMDTXENB,
+		ioaddr + RTL_REG_CHIPCMD);
 	outl((RX_FIFO_THRESH<<13) | (RX_BUF_LEN_IDX<<11) | (RX_DMA_BURST<<8),
-		ioaddr + RxConfig);		/* accept no frames yet!  */
-	outl((TX_DMA_BURST<<8)|0x03000000, ioaddr + TxConfig);
+		ioaddr + RTL_REG_RXCONFIG);		/* accept no frames yet!  */
+	outl((TX_DMA_BURST<<8)|0x03000000, ioaddr + RTL_REG_TXCONFIG);
 
-	/* The Linux driver changes Config1 here to use a different LED pattern
+	/* The Linux driver changes RTL_REG_CONFIG1 here to use a different LED pattern
 	 * for half duplex or full/autodetect duplex (for full/autodetect, the
 	 * outputs are TX/RX, Link10/100, FULL, while for half duplex it uses
 	 * TX/RX, Link100, Link10).  This is messy, because it doesn't match
@@ -380,24 +404,25 @@
 	debug_cond(DEBUG_RX,
 		"rx ring address is %lX\n",(unsigned long)rx_ring);
 	flush_cache((unsigned long)rx_ring, RX_BUF_LEN);
-	outl(phys_to_bus((int)rx_ring), ioaddr + RxBuf);
+	outl(phys_to_bus((int)rx_ring), ioaddr + RTL_REG_RXBUF);
 
-	/* If we add multicast support, the MAR0 register would have to be
+	/* If we add multicast support, the RTL_REG_MAR0 register would have to be
 	 * initialized to 0xffffffffffffffff (two 32 bit accesses).  Etherboot
 	 * only needs broadcast (for ARP/RARP/BOOTP/DHCP) and unicast.	*/
 
-	outb(CmdRxEnb | CmdTxEnb, ioaddr + ChipCmd);
+	outb(RTL_REG_CHIPCMD_CMDRXENB | RTL_REG_CHIPCMD_CMDTXENB,
+		ioaddr + RTL_REG_CHIPCMD);
 
-	outl(rtl8139_rx_config, ioaddr + RxConfig);
+	outl(rtl8139_rx_config, ioaddr + RTL_REG_RXCONFIG);
 
 	/* Start the chip's Tx and Rx process. */
-	outl(0, ioaddr + RxMissed);
+	outl(0, ioaddr + RTL_REG_RXMISSED);
 
 	/* set_rx_mode */
 	set_rx_mode(dev);
 
 	/* Disable all known interrupts by setting the interrupt mask. */
-	outw(0, ioaddr + IntrMask);
+	outw(0, ioaddr + RTL_REG_INTRMASK);
 }
 
 static int rtl_transmit(struct eth_device *dev, void *packet, int length)
@@ -420,23 +445,32 @@
 	}
 
 	flush_cache((unsigned long)tx_buffer, length);
-	outl(phys_to_bus((int)tx_buffer), ioaddr + TxAddr0 + cur_tx*4);
+	outl(phys_to_bus((int)tx_buffer), ioaddr + RTL_REG_TXADDR0 + cur_tx*4);
 	outl(((TX_FIFO_THRESH<<11) & 0x003f0000) | len,
-		ioaddr + TxStatus0 + cur_tx*4);
+		ioaddr + RTL_REG_TXSTATUS0 + cur_tx*4);
 
 	do {
-		status = inw(ioaddr + IntrStatus);
-		/* Only acknlowledge interrupt sources we can properly handle
-		 * here - the RxOverflow/RxFIFOOver MUST be handled in the
-		 * rtl_poll() function.	 */
-		outw(status & (TxOK | TxErr | PCIErr), ioaddr + IntrStatus);
-		if ((status & (TxOK | TxErr | PCIErr)) != 0) break;
+		status = inw(ioaddr + RTL_REG_INTRSTATUS);
+		/*
+		 * Only acknlowledge interrupt sources we can properly
+		 * handle here - the RTL_REG_INTRSTATUS_RXOVERFLOW/
+		 * RTL_REG_INTRSTATUS_RXFIFOOVER MUST be handled in the
+		 * rtl_poll() function.
+		 */
+		outw(status & (RTL_REG_INTRSTATUS_TXOK |
+			       RTL_REG_INTRSTATUS_TXERR |
+			       RTL_REG_INTRSTATUS_PCIERR),
+			ioaddr + RTL_REG_INTRSTATUS);
+		if ((status & (RTL_REG_INTRSTATUS_TXOK |
+			       RTL_REG_INTRSTATUS_TXERR |
+			       RTL_REG_INTRSTATUS_PCIERR)) != 0)
+			break;
 		udelay(10);
 	} while (i++ < RTL_TIMEOUT);
 
-	txstatus = inl(ioaddr + TxStatus0 + cur_tx*4);
+	txstatus = inl(ioaddr + RTL_REG_TXSTATUS0 + cur_tx*4);
 
-	if (status & TxOK) {
+	if (status & RTL_REG_INTRSTATUS_TXOK) {
 		cur_tx = (cur_tx + 1) % NUM_TX_DESC;
 
 		debug_cond(DEBUG_TX,
@@ -465,13 +499,16 @@
 
 	ioaddr = dev->iobase;
 
-	if (inb(ioaddr + ChipCmd) & RxBufEmpty) {
+	if (inb(ioaddr + RTL_REG_CHIPCMD) & RTL_REG_CHIPCMD_RXBUFEMPTY) {
 		return 0;
 	}
 
-	status = inw(ioaddr + IntrStatus);
+	status = inw(ioaddr + RTL_REG_INTRSTATUS);
 	/* See below for the rest of the interrupt acknowledges.  */
-	outw(status & ~(RxFIFOOver | RxOverflow | RxOK), ioaddr + IntrStatus);
+	outw(status & ~(RTL_REG_INTRSTATUS_RXFIFOOVER |
+			RTL_REG_INTRSTATUS_RXOVERFLOW |
+			RTL_REG_INTRSTATUS_RXOK),
+		ioaddr + RTL_REG_INTRSTATUS);
 
 	debug_cond(DEBUG_RX, "rtl_poll: int %hX ", status);
 
@@ -481,7 +518,9 @@
 	rx_size = rx_status >> 16;
 	rx_status &= 0xffff;
 
-	if ((rx_status & (RxBadSymbol|RxRunt|RxTooLong|RxCRCErr|RxBadAlign)) ||
+	if ((rx_status & (RTL_STS_RXBADSYMBOL | RTL_STS_RXRUNT |
+			  RTL_STS_RXTOOLONG | RTL_STS_RXCRCERR |
+			  RTL_STS_RXBADALIGN)) ||
 	    (rx_size < ETH_ZLEN) || (rx_size > ETH_FRAME_LEN + 4)) {
 		printf("rx error %hX\n", rx_status);
 		rtl_reset(dev); /* this clears all interrupts still pending */
@@ -507,11 +546,13 @@
 	flush_cache((unsigned long)rx_ring, RX_BUF_LEN);
 
 	cur_rx = (cur_rx + rx_size + 4 + 3) & ~3;
-	outw(cur_rx - 16, ioaddr + RxBufPtr);
+	outw(cur_rx - 16, ioaddr + RTL_REG_RXBUFPTR);
 	/* See RTL8139 Programming Guide V0.1 for the official handling of
 	 * Rx overflow situations.  The document itself contains basically no
 	 * usable information, except for a few exception handling rules.  */
-	outw(status & (RxFIFOOver | RxOverflow | RxOK), ioaddr + IntrStatus);
+	outw(status & (RTL_REG_INTRSTATUS_RXFIFOOVER |
+		       RTL_REG_INTRSTATUS_RXOVERFLOW |
+		       RTL_REG_INTRSTATUS_RXOK), ioaddr + RTL_REG_INTRSTATUS);
 	return length;
 }
 
@@ -522,11 +563,11 @@
 	ioaddr = dev->iobase;
 
 	/* reset the chip */
-	outb(CmdReset, ioaddr + ChipCmd);
+	outb(RTL_REG_CHIPCMD_CMDRESET, ioaddr + RTL_REG_CHIPCMD);
 
 	/* Give the chip 10ms to finish the reset. */
 	for (i=0; i<100; ++i){
-		if ((inb(ioaddr + ChipCmd) & CmdReset) == 0) break;
+		if ((inb(ioaddr + RTL_REG_CHIPCMD) & RTL_REG_CHIPCMD_CMDRESET) == 0) break;
 		udelay (100); /* wait 100us */
 	}
 }