1998-11-30 OKUJI Yoshinori <okuji@kuicr.kyoto-u.ac.jp>

	Clean up linux emulation code to make it architecture-independent
	as much as possible.

	* linux: Renamed from linuxdev.
	* Makefile.in (objfiles): Add linux.o instead of linuxdev.o.
	(MAKE): New variable. Used for the linux.o target.
	* configure.in: Add AC_CHECK_TOOL(MAKE, make).
	* i386/i386/spl.h: Include <i386/ipl.h>, for compatibility with
	OSF Mach 3.0. Suggested by Elgin Lee <ehl@funghi.com>.
	* linux/src: Renamed from linux/linux.
	* linux/dev: Renamed from linux/mach.
	* linux/Drivers.in (AC_INIT): Use dev/include/linux/autoconf.h,
	instead of mach/include/linux/autoconf.h.
	* Makefile.in (all): Target ../linux.o instead of ../linuxdev.o.
	* linux/dev/drivers/block/genhd.c: Include <machine/spl.h> instead
	of <i386/ipl.h>.
	* linux/dev/drivers/net/auto_irq.c: Remove unneeded header files,
	<i386/ipl.h> and <i386/pic.h>.
	* linux/dev/init/main.c: Many i386-dependent codes moved to ...
	* linux/dev/arch/i386/irq.c: ... here.
	* linux/dev/arch/i386/setup.c: New file.
	* linux/dev/arch/i386/linux_emul.h: Likewise.
	* linux/dev/arch/i386/glue/timer.c: Merged into sched.c.
	* linux/dev/arch/i386/glue/sched.c: Include <machine/spl.h> instead
	of <i386/ipl.h>, and moved to ...
	* linux/dev/kernel/sched.c: ... here.
	* linux/dev/arch/i386/glue/block.c: Include <machine/spl.h> and
	<linux_emul.h>, instead of i386-dependent header files, and
	moved to ...
	* linux/dev/glue/blocl.c: ... here.
	* linux/dev/arch/i386/glue/net.c: Include <machine/spl.h> and
	<linux_emul.h>, instead of i386-dependent header files, and
	moved to ...
	* linux/dev/glue/net.c: ... here.
	* linux/dev/arch/i386/glue/misc.c: Remove `x86' and moved to ...
	* linux/dev/glue/misc.c: ... here.
	* linux/dev/arch/i386/glue/kmem.c: Moved to ...
	* linux/dev/glue/kmem.c: ... here.

1 files changed, 832 insertions, 0 deletions

diff --git a/linux/src/drivers/net/8390.c b/linux/src/drivers/net/8390.c
new file mode 100644
index 0000000..9864106
--- /dev/null
+++ b/linux/src/drivers/net/8390.c
@@ -0,0 +1,832 @@
+/* 8390.c: A general NS8390 ethernet driver core for linux. */
+/*
+	Written 1992-94 by Donald Becker.
+  
+	Copyright 1993 United States Government as represented by the
+	Director, National Security Agency.
+
+	This software may be used and distributed according to the terms
+	of the GNU Public License, incorporated herein by reference.
+
+	The author may be reached as becker@CESDIS.gsfc.nasa.gov, or C/O
+	Center of Excellence in Space Data and Information Sciences
+	   Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771
+  
+  This is the chip-specific code for many 8390-based ethernet adaptors.
+  This is not a complete driver, it must be combined with board-specific
+  code such as ne.c, wd.c, 3c503.c, etc.
+
+  Seeing how at least eight drivers use this code, (not counting the
+  PCMCIA ones either) it is easy to break some card by what seems like
+  a simple innocent change. Please contact me or Donald if you think
+  you have found something that needs changing. -- PG
+
+
+  Changelog:
+
+  Paul Gortmaker	: remove set_bit lock, other cleanups.
+  Paul Gortmaker	: add ei_get_8390_hdr() so we can pass skb's to 
+			  ei_block_input() for eth_io_copy_and_sum().
+  Paul Gortmaker	: exchange static int ei_pingpong for a #define,
+			  also add better Tx error handling.
+  Paul Gortmaker	: rewrite Rx overrun handling as per NS specs.
+
+
+  Sources:
+  The National Semiconductor LAN Databook, and the 3Com 3c503 databook.
+
+  */
+
+static const char *version =
+    "8390.c:v1.10 9/23/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/types.h>
+#include <linux/ptrace.h>
+#include <linux/string.h>
+#include <asm/system.h>
+#include <asm/segment.h>
+#include <asm/bitops.h>
+#include <asm/io.h>
+#include <linux/errno.h>
+#include <linux/fcntl.h>
+#include <linux/in.h>
+#include <linux/interrupt.h>
+
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+
+#include "8390.h"
+
+/* These are the operational function interfaces to board-specific
+   routines.
+	void reset_8390(struct device *dev)
+		Resets the board associated with DEV, including a hardware reset of
+		the 8390.  This is only called when there is a transmit timeout, and
+		it is always followed by 8390_init().
+	void block_output(struct device *dev, int count, const unsigned char *buf,
+					  int start_page)
+		Write the COUNT bytes of BUF to the packet buffer at START_PAGE.  The
+		"page" value uses the 8390's 256-byte pages.
+	void get_8390_hdr(struct device *dev, struct e8390_hdr *hdr, int ring_page)
+		Read the 4 byte, page aligned 8390 header. *If* there is a
+		subsequent read, it will be of the rest of the packet.
+	void block_input(struct device *dev, int count, struct sk_buff *skb, int ring_offset)
+		Read COUNT bytes from the packet buffer into the skb data area. Start 
+		reading from RING_OFFSET, the address as the 8390 sees it.  This will always
+		follow the read of the 8390 header. 
+*/
+#define ei_reset_8390 (ei_local->reset_8390)
+#define ei_block_output (ei_local->block_output)
+#define ei_block_input (ei_local->block_input)
+#define ei_get_8390_hdr (ei_local->get_8390_hdr)
+
+/* use 0 for production, 1 for verification, >2 for debug */
+#ifdef EI_DEBUG
+int ei_debug = EI_DEBUG;
+#else
+int ei_debug = 1;
+#endif
+
+/* Index to functions. */
+static void ei_tx_intr(struct device *dev);
+static void ei_tx_err(struct device *dev);
+static void ei_receive(struct device *dev);
+static void ei_rx_overrun(struct device *dev);
+
+/* Routines generic to NS8390-based boards. */
+static void NS8390_trigger_send(struct device *dev, unsigned int length,
+								int start_page);
+static void set_multicast_list(struct device *dev);
+
+
+/* Open/initialize the board.  This routine goes all-out, setting everything
+   up anew at each open, even though many of these registers should only
+   need to be set once at boot.
+   */
+int ei_open(struct device *dev)
+{
+    struct ei_device *ei_local = (struct ei_device *) dev->priv;
+
+    /* This can't happen unless somebody forgot to call ethdev_init(). */
+    if (ei_local == NULL) {
+	printk(KERN_EMERG "%s: ei_open passed a non-existent device!\n", dev->name);
+	return -ENXIO;
+    }
+    
+    irq2dev_map[dev->irq] = dev;
+    NS8390_init(dev, 1);
+    dev->start = 1;
+    ei_local->irqlock = 0;
+    return 0;
+}
+
+/* Opposite of above. Only used when "ifconfig <devname> down" is done. */
+int ei_close(struct device *dev)
+{
+    NS8390_init(dev, 0);
+    dev->start = 0;
+    return 0;
+}
+
+static int ei_start_xmit(struct sk_buff *skb, struct device *dev)
+{
+    int e8390_base = dev->base_addr;
+    struct ei_device *ei_local = (struct ei_device *) dev->priv;
+    int length, send_length, output_page;
+
+/*
+ *  We normally shouldn't be called if dev->tbusy is set, but the
+ *  existing code does anyway. If it has been too long since the
+ *  last Tx, we assume the board has died and kick it.
+ */
+ 
+    if (dev->tbusy) {	/* Do timeouts, just like the 8003 driver. */
+		int txsr = inb(e8390_base+EN0_TSR), isr;
+		int tickssofar = jiffies - dev->trans_start;
+		if (tickssofar < TX_TIMEOUT ||	(tickssofar < (TX_TIMEOUT+5) && ! (txsr & ENTSR_PTX))) {
+			return 1;
+		}
+		isr = inb(e8390_base+EN0_ISR);
+		if (dev->start == 0) {
+			printk("%s: xmit on stopped card\n", dev->name);
+			return 1;
+		}
+
+		/*
+		 * Note that if the Tx posted a TX_ERR interrupt, then the
+		 * error will have been handled from the interrupt handler.
+		 * and not here.
+		 */
+
+		printk(KERN_DEBUG "%s: Tx timed out, %s TSR=%#2x, ISR=%#2x, t=%d.\n",
+		   dev->name, (txsr & ENTSR_ABT) ? "excess collisions." :
+		   (isr) ? "lost interrupt?" : "cable problem?", txsr, isr, tickssofar);
+
+		if (!isr && !ei_local->stat.tx_packets) {
+		   /* The 8390 probably hasn't gotten on the cable yet. */
+		   ei_local->interface_num ^= 1;   /* Try a different xcvr.  */
+		}
+
+		/* Try to restart the card.  Perhaps the user has fixed something. */
+		ei_reset_8390(dev);
+		NS8390_init(dev, 1);
+		dev->trans_start = jiffies;
+    }
+    
+    /* Sending a NULL skb means some higher layer thinks we've missed an
+       tx-done interrupt. Caution: dev_tint() handles the cli()/sti()
+       itself. */
+    if (skb == NULL) {
+		dev_tint(dev);
+		return 0;
+    }
+    
+    length = skb->len;
+    if (skb->len <= 0)
+		return 0;
+
+    /* Mask interrupts from the ethercard. */
+    outb_p(0x00, e8390_base + EN0_IMR);
+    if (dev->interrupt) {
+	printk("%s: Tx request while isr active.\n",dev->name);
+	outb_p(ENISR_ALL, e8390_base + EN0_IMR);
+	return 1;
+    }
+    ei_local->irqlock = 1;
+
+    send_length = ETH_ZLEN < length ? length : ETH_ZLEN;
+
+#ifdef EI_PINGPONG
+
+    /*
+     * We have two Tx slots available for use. Find the first free
+     * slot, and then perform some sanity checks. With two Tx bufs,
+     * you get very close to transmitting back-to-back packets. With
+     * only one Tx buf, the transmitter sits idle while you reload the
+     * card, leaving a substantial gap between each transmitted packet.
+     */
+
+    if (ei_local->tx1 == 0) {
+	output_page = ei_local->tx_start_page;
+	ei_local->tx1 = send_length;
+	if (ei_debug  &&  ei_local->tx2 > 0)
+		printk("%s: idle transmitter tx2=%d, lasttx=%d, txing=%d.\n",
+			dev->name, ei_local->tx2, ei_local->lasttx, ei_local->txing);
+    } else if (ei_local->tx2 == 0) {
+	output_page = ei_local->tx_start_page + TX_1X_PAGES;
+	ei_local->tx2 = send_length;
+	if (ei_debug  &&  ei_local->tx1 > 0)
+		printk("%s: idle transmitter, tx1=%d, lasttx=%d, txing=%d.\n",
+			dev->name, ei_local->tx1, ei_local->lasttx, ei_local->txing);
+    } else {	/* We should never get here. */
+	if (ei_debug)
+		printk("%s: No Tx buffers free! irq=%d tx1=%d tx2=%d last=%d\n",
+			dev->name, dev->interrupt, ei_local->tx1, ei_local->tx2, ei_local->lasttx);
+	ei_local->irqlock = 0;
+	dev->tbusy = 1;
+	outb_p(ENISR_ALL, e8390_base + EN0_IMR);
+	return 1;
+    }
+
+    /*
+     * Okay, now upload the packet and trigger a send if the transmitter
+     * isn't already sending. If it is busy, the interrupt handler will
+     * trigger the send later, upon receiving a Tx done interrupt.
+     */
+
+    ei_block_output(dev, length, skb->data, output_page);
+    if (! ei_local->txing) {
+	ei_local->txing = 1;
+	NS8390_trigger_send(dev, send_length, output_page);
+	dev->trans_start = jiffies;
+	if (output_page == ei_local->tx_start_page) {
+		ei_local->tx1 = -1;
+		ei_local->lasttx = -1;
+	} else {
+		ei_local->tx2 = -1;
+		ei_local->lasttx = -2;
+	}
+    } else
+	ei_local->txqueue++;
+
+    dev->tbusy = (ei_local->tx1  &&  ei_local->tx2);
+
+#else	/* EI_PINGPONG */
+
+    /*
+     * Only one Tx buffer in use. You need two Tx bufs to come close to
+     * back-to-back transmits. Expect a 20 -> 25% performance hit on
+     * reasonable hardware if you only use one Tx buffer.
+     */
+
+    ei_block_output(dev, length, skb->data, ei_local->tx_start_page);
+    ei_local->txing = 1;
+    NS8390_trigger_send(dev, send_length, ei_local->tx_start_page);
+    dev->trans_start = jiffies;
+    dev->tbusy = 1;
+
+#endif	/* EI_PINGPONG */
+
+    /* Turn 8390 interrupts back on. */
+    ei_local->irqlock = 0;
+    outb_p(ENISR_ALL, e8390_base + EN0_IMR);
+
+    dev_kfree_skb (skb, FREE_WRITE);
+    
+    return 0;
+}
+
+/* The typical workload of the driver:
+   Handle the ether interface interrupts. */
+void ei_interrupt(int irq, void *dev_id, struct pt_regs * regs)
+{
+    struct device *dev = (struct device *)(irq2dev_map[irq]);
+    int e8390_base;
+    int interrupts, nr_serviced = 0;
+    struct ei_device *ei_local;
+    
+    if (dev == NULL) {
+		printk ("net_interrupt(): irq %d for unknown device.\n", irq);
+		return;
+    }
+    e8390_base = dev->base_addr;
+    ei_local = (struct ei_device *) dev->priv;
+    if (dev->interrupt || ei_local->irqlock) {
+		/* The "irqlock" check is only for testing. */
+		printk(ei_local->irqlock
+			   ? "%s: Interrupted while interrupts are masked! isr=%#2x imr=%#2x.\n"
+			   : "%s: Reentering the interrupt handler! isr=%#2x imr=%#2x.\n",
+			   dev->name, inb_p(e8390_base + EN0_ISR),
+			   inb_p(e8390_base + EN0_IMR));
+		return;
+    }
+    
+    dev->interrupt = 1;
+    
+    /* Change to page 0 and read the intr status reg. */
+    outb_p(E8390_NODMA+E8390_PAGE0, e8390_base + E8390_CMD);
+    if (ei_debug > 3)
+		printk("%s: interrupt(isr=%#2.2x).\n", dev->name,
+			   inb_p(e8390_base + EN0_ISR));
+    
+    /* !!Assumption!! -- we stay in page 0.	 Don't break this. */
+    while ((interrupts = inb_p(e8390_base + EN0_ISR)) != 0
+		   && ++nr_serviced < MAX_SERVICE) {
+		if (dev->start == 0) {
+			printk("%s: interrupt from stopped card\n", dev->name);
+			interrupts = 0;
+			break;
+		}
+		if (interrupts & ENISR_OVER) {
+			ei_rx_overrun(dev);
+		} else if (interrupts & (ENISR_RX+ENISR_RX_ERR)) {
+			/* Got a good (?) packet. */
+			ei_receive(dev);
+		}
+		/* Push the next to-transmit packet through. */
+		if (interrupts & ENISR_TX) {
+			ei_tx_intr(dev);
+		} else if (interrupts & ENISR_TX_ERR) {
+			ei_tx_err(dev);
+		}
+
+		if (interrupts & ENISR_COUNTERS) {
+			ei_local->stat.rx_frame_errors += inb_p(e8390_base + EN0_COUNTER0);
+			ei_local->stat.rx_crc_errors   += inb_p(e8390_base + EN0_COUNTER1);
+			ei_local->stat.rx_missed_errors+= inb_p(e8390_base + EN0_COUNTER2);
+			outb_p(ENISR_COUNTERS, e8390_base + EN0_ISR); /* Ack intr. */
+		}
+		
+		/* Ignore any RDC interrupts that make it back to here. */
+		if (interrupts & ENISR_RDC) {
+			outb_p(ENISR_RDC, e8390_base + EN0_ISR);
+		}
+
+		outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base + E8390_CMD);
+    }
+    
+    if (interrupts && ei_debug) {
+		outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base + E8390_CMD);
+		if (nr_serviced >= MAX_SERVICE) {
+			printk("%s: Too much work at interrupt, status %#2.2x\n",
+				   dev->name, interrupts);
+			outb_p(ENISR_ALL, e8390_base + EN0_ISR); /* Ack. most intrs. */
+		} else {
+			printk("%s: unknown interrupt %#2x\n", dev->name, interrupts);
+			outb_p(0xff, e8390_base + EN0_ISR); /* Ack. all intrs. */
+		}
+    }
+    dev->interrupt = 0;
+    return;
+}
+
+/*
+ * A transmitter error has happened. Most likely excess collisions (which
+ * is a fairly normal condition). If the error is one where the Tx will
+ * have been aborted, we try and send another one right away, instead of
+ * letting the failed packet sit and collect dust in the Tx buffer. This
+ * is a much better solution as it avoids kernel based Tx timeouts, and
+ * an unnecessary card reset.
+ */
+
+static void ei_tx_err(struct device *dev)
+{
+    int e8390_base = dev->base_addr;
+    unsigned char txsr = inb_p(e8390_base+EN0_TSR);
+    unsigned char tx_was_aborted = txsr & (ENTSR_ABT+ENTSR_FU);
+    struct ei_device *ei_local = (struct ei_device *) dev->priv;
+
+#ifdef VERBOSE_ERROR_DUMP
+    printk(KERN_DEBUG "%s: transmitter error (%#2x): ", dev->name, txsr);
+    if (txsr & ENTSR_ABT)
+		printk("excess-collisions ");
+    if (txsr & ENTSR_ND)
+		printk("non-deferral ");
+    if (txsr & ENTSR_CRS)
+		printk("lost-carrier ");
+    if (txsr & ENTSR_FU)
+		printk("FIFO-underrun ");
+    if (txsr & ENTSR_CDH)
+		printk("lost-heartbeat ");
+    printk("\n");
+#endif
+
+    outb_p(ENISR_TX_ERR, e8390_base + EN0_ISR); /* Ack intr. */
+
+    if (tx_was_aborted)
+		ei_tx_intr(dev);
+
+    /*
+     * Note: NCR reads zero on 16 collisions so we add them
+     * in by hand. Somebody might care...
+     */
+    if (txsr & ENTSR_ABT)
+	ei_local->stat.collisions += 16;
+	
+}
+
+/* We have finished a transmit: check for errors and then trigger the next
+   packet to be sent. */
+static void ei_tx_intr(struct device *dev)
+{
+    int e8390_base = dev->base_addr;
+    int status = inb(e8390_base + EN0_TSR);
+    struct ei_device *ei_local = (struct ei_device *) dev->priv;
+    
+    outb_p(ENISR_TX, e8390_base + EN0_ISR); /* Ack intr. */
+
+#ifdef EI_PINGPONG
+
+    /*
+     * There are two Tx buffers, see which one finished, and trigger
+     * the send of another one if it exists.
+     */
+    ei_local->txqueue--;
+    if (ei_local->tx1 < 0) {
+	if (ei_local->lasttx != 1 && ei_local->lasttx != -1)
+		printk("%s: bogus last_tx_buffer %d, tx1=%d.\n",
+			   ei_local->name, ei_local->lasttx, ei_local->tx1);
+	ei_local->tx1 = 0;
+	dev->tbusy = 0;
+	if (ei_local->tx2 > 0) {
+		ei_local->txing = 1;
+		NS8390_trigger_send(dev, ei_local->tx2, ei_local->tx_start_page + 6);
+		dev->trans_start = jiffies;
+		ei_local->tx2 = -1,
+		ei_local->lasttx = 2;
+	} else
+		ei_local->lasttx = 20, ei_local->txing = 0;
+    } else if (ei_local->tx2 < 0) {
+	if (ei_local->lasttx != 2  &&  ei_local->lasttx != -2)
+		printk("%s: bogus last_tx_buffer %d, tx2=%d.\n",
+			   ei_local->name, ei_local->lasttx, ei_local->tx2);
+	ei_local->tx2 = 0;
+	dev->tbusy = 0;
+	if (ei_local->tx1 > 0) {
+		ei_local->txing = 1;
+		NS8390_trigger_send(dev, ei_local->tx1, ei_local->tx_start_page);
+		dev->trans_start = jiffies;
+		ei_local->tx1 = -1;
+		ei_local->lasttx = 1;
+	} else
+		ei_local->lasttx = 10, ei_local->txing = 0;
+    } else
+	printk("%s: unexpected TX-done interrupt, lasttx=%d.\n",
+		   dev->name, ei_local->lasttx);
+
+#else	/* EI_PINGPONG */
+    /*
+     *  Single Tx buffer: mark it free so another packet can be loaded.
+     */
+    ei_local->txing = 0;
+    dev->tbusy = 0;
+#endif
+
+    /* Minimize Tx latency: update the statistics after we restart TXing. */
+    if (status & ENTSR_COL)
+	ei_local->stat.collisions++;
+    if (status & ENTSR_PTX)
+	ei_local->stat.tx_packets++;
+    else {
+	ei_local->stat.tx_errors++;
+	if (status & ENTSR_ABT) ei_local->stat.tx_aborted_errors++;
+	if (status & ENTSR_CRS) ei_local->stat.tx_carrier_errors++;
+	if (status & ENTSR_FU)  ei_local->stat.tx_fifo_errors++;
+	if (status & ENTSR_CDH) ei_local->stat.tx_heartbeat_errors++;
+	if (status & ENTSR_OWC) ei_local->stat.tx_window_errors++;
+    }
+
+    mark_bh (NET_BH);
+}
+
+/* We have a good packet(s), get it/them out of the buffers. */
+
+static void ei_receive(struct device *dev)
+{
+    int e8390_base = dev->base_addr;
+    struct ei_device *ei_local = (struct ei_device *) dev->priv;
+    unsigned char rxing_page, this_frame, next_frame;
+    unsigned short current_offset;
+    int rx_pkt_count = 0;
+    struct e8390_pkt_hdr rx_frame;
+    int num_rx_pages = ei_local->stop_page-ei_local->rx_start_page;
+    
+    while (++rx_pkt_count < 10) {
+		int pkt_len;
+		
+		/* Get the rx page (incoming packet pointer). */
+		outb_p(E8390_NODMA+E8390_PAGE1, e8390_base + E8390_CMD);
+		rxing_page = inb_p(e8390_base + EN1_CURPAG);
+		outb_p(E8390_NODMA+E8390_PAGE0, e8390_base + E8390_CMD);
+		
+		/* Remove one frame from the ring.  Boundary is always a page behind. */
+		this_frame = inb_p(e8390_base + EN0_BOUNDARY) + 1;
+		if (this_frame >= ei_local->stop_page)
+			this_frame = ei_local->rx_start_page;
+		
+		/* Someday we'll omit the previous, iff we never get this message.
+		   (There is at least one clone claimed to have a problem.)  */
+		if (ei_debug > 0  &&  this_frame != ei_local->current_page)
+			printk("%s: mismatched read page pointers %2x vs %2x.\n",
+				   dev->name, this_frame, ei_local->current_page);
+		
+		if (this_frame == rxing_page)	/* Read all the frames? */
+			break;				/* Done for now */
+		
+		current_offset = this_frame << 8;
+		ei_get_8390_hdr(dev, &rx_frame, this_frame);
+		
+		pkt_len = rx_frame.count - sizeof(struct e8390_pkt_hdr);
+		
+		next_frame = this_frame + 1 + ((pkt_len+4)>>8);
+		
+		/* Check for bogosity warned by 3c503 book: the status byte is never
+		   written.  This happened a lot during testing! This code should be
+		   cleaned up someday. */
+		if (rx_frame.next != next_frame
+			&& rx_frame.next != next_frame + 1
+			&& rx_frame.next != next_frame - num_rx_pages
+			&& rx_frame.next != next_frame + 1 - num_rx_pages) {
+			ei_local->current_page = rxing_page;
+			outb(ei_local->current_page-1, e8390_base+EN0_BOUNDARY);
+			ei_local->stat.rx_errors++;
+			continue;
+		}
+
+		if (pkt_len < 60  ||  pkt_len > 1518) {
+			if (ei_debug)
+				printk("%s: bogus packet size: %d, status=%#2x nxpg=%#2x.\n",
+					   dev->name, rx_frame.count, rx_frame.status,
+					   rx_frame.next);
+			ei_local->stat.rx_errors++;
+		} else if ((rx_frame.status & 0x0F) == ENRSR_RXOK) {
+			struct sk_buff *skb;
+			
+			skb = dev_alloc_skb(pkt_len+2);
+			if (skb == NULL) {
+				if (ei_debug > 1)
+					printk("%s: Couldn't allocate a sk_buff of size %d.\n",
+						   dev->name, pkt_len);
+				ei_local->stat.rx_dropped++;
+				break;
+			} else {
+				skb_reserve(skb,2);	/* IP headers on 16 byte boundaries */
+				skb->dev = dev;
+				skb_put(skb, pkt_len);	/* Make room */
+				ei_block_input(dev, pkt_len, skb, current_offset + sizeof(rx_frame));
+				skb->protocol=eth_type_trans(skb,dev);
+				netif_rx(skb);
+				ei_local->stat.rx_packets++;
+			}
+		} else {
+			int errs = rx_frame.status;
+			if (ei_debug)
+				printk("%s: bogus packet: status=%#2x nxpg=%#2x size=%d\n",
+					   dev->name, rx_frame.status, rx_frame.next,
+					   rx_frame.count);
+			if (errs & ENRSR_FO)
+				ei_local->stat.rx_fifo_errors++;
+		}
+		next_frame = rx_frame.next;
+		
+		/* This _should_ never happen: it's here for avoiding bad clones. */
+		if (next_frame >= ei_local->stop_page) {
+			printk("%s: next frame inconsistency, %#2x\n", dev->name,
+				   next_frame);
+			next_frame = ei_local->rx_start_page;
+		}
+		ei_local->current_page = next_frame;
+		outb_p(next_frame-1, e8390_base+EN0_BOUNDARY);
+    }
+
+    /* We used to also ack ENISR_OVER here, but that would sometimes mask
+    a real overrun, leaving the 8390 in a stopped state with rec'vr off. */
+    outb_p(ENISR_RX+ENISR_RX_ERR, e8390_base+EN0_ISR);
+    return;
+}
+
+/* 
+ * We have a receiver overrun: we have to kick the 8390 to get it started
+ * again. Problem is that you have to kick it exactly as NS prescribes in
+ * the updated datasheets, or "the NIC may act in an unpredictable manner."
+ * This includes causing "the NIC to defer indefinitely when it is stopped
+ * on a busy network."  Ugh.
+ */
+static void ei_rx_overrun(struct device *dev)
+{
+    int e8390_base = dev->base_addr;
+    unsigned long wait_start_time;
+    unsigned char was_txing, must_resend = 0;
+    struct ei_device *ei_local = (struct ei_device *) dev->priv;
+    
+    /*
+     * Record whether a Tx was in progress and then issue the
+     * stop command.
+     */
+    was_txing = inb_p(e8390_base+E8390_CMD) & E8390_TRANS;
+    outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD);
+    
+    if (ei_debug > 1)
+	printk("%s: Receiver overrun.\n", dev->name);
+    ei_local->stat.rx_over_errors++;
+    
+    /* 
+     * Wait a full Tx time (1.2ms) + some guard time, NS says 1.6ms total.
+     * Early datasheets said to poll the reset bit, but now they say that
+     * it "is not a reliable indicator and subsequently should be ignored."
+     * We wait at least 10ms.
+     */
+    wait_start_time = jiffies;
+    while (jiffies - wait_start_time <= 1*HZ/100)
+	barrier();
+
+    /*
+     * Reset RBCR[01] back to zero as per magic incantation.
+     */
+    outb_p(0x00, e8390_base+EN0_RCNTLO);
+    outb_p(0x00, e8390_base+EN0_RCNTHI);
+
+    /*
+     * See if any Tx was interrupted or not. According to NS, this
+     * step is vital, and skipping it will cause no end of havoc.
+     */
+    if (was_txing) { 
+	unsigned char tx_completed = inb_p(e8390_base+EN0_ISR) & (ENISR_TX+ENISR_TX_ERR);
+	if (!tx_completed) must_resend = 1;
+    }
+
+    /*
+     * Have to enter loopback mode and then restart the NIC before
+     * you are allowed to slurp packets up off the ring.
+     */
+    outb_p(E8390_TXOFF, e8390_base + EN0_TXCR);
+    outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START, e8390_base + E8390_CMD);
+
+    /*
+     * Clear the Rx ring of all the debris, and ack the interrupt.
+     */
+    ei_receive(dev);
+    outb_p(ENISR_OVER, e8390_base+EN0_ISR);
+
+    /*
+     * Leave loopback mode, and resend any packet that got stopped.
+     */
+    outb_p(E8390_TXCONFIG, e8390_base + EN0_TXCR); 
+    if (must_resend)
+    	outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START + E8390_TRANS, e8390_base + E8390_CMD);
+	
+}
+
+static struct enet_statistics *get_stats(struct device *dev)
+{
+    short ioaddr = dev->base_addr;
+    struct ei_device *ei_local = (struct ei_device *) dev->priv;
+    
+    /* If the card is stopped, just return the present stats. */
+    if (dev->start == 0) return &ei_local->stat;
+
+    /* Read the counter registers, assuming we are in page 0. */
+    ei_local->stat.rx_frame_errors += inb_p(ioaddr + EN0_COUNTER0);
+    ei_local->stat.rx_crc_errors   += inb_p(ioaddr + EN0_COUNTER1);
+    ei_local->stat.rx_missed_errors+= inb_p(ioaddr + EN0_COUNTER2);
+    
+    return &ei_local->stat;
+}
+
+/*
+ *	Set or clear the multicast filter for this adaptor.
+ */
+ 
+static void set_multicast_list(struct device *dev)
+{
+	short ioaddr = dev->base_addr;
+    
+	if(dev->flags&IFF_PROMISC)
+	{
+		outb_p(E8390_RXCONFIG | 0x18, ioaddr + EN0_RXCR);
+	}
+	else if((dev->flags&IFF_ALLMULTI)||dev->mc_list)
+	{
+		/* The multicast-accept list is initialized to accept-all, and we
+		   rely on higher-level filtering for now. */
+		outb_p(E8390_RXCONFIG | 0x08, ioaddr + EN0_RXCR);
+	} 
+	else
+		outb_p(E8390_RXCONFIG, ioaddr + EN0_RXCR);
+}
+
+/* Initialize the rest of the 8390 device structure. */
+int ethdev_init(struct device *dev)
+{
+    if (ei_debug > 1)
+		printk(version);
+    
+    if (dev->priv == NULL) {
+		struct ei_device *ei_local;
+		
+		dev->priv = kmalloc(sizeof(struct ei_device), GFP_KERNEL);
+		if (dev->priv == NULL)
+			return -ENOMEM;
+		memset(dev->priv, 0, sizeof(struct ei_device));
+		ei_local = (struct ei_device *)dev->priv;
+    }
+    
+    dev->hard_start_xmit = &ei_start_xmit;
+    dev->get_stats	= get_stats;
+    dev->set_multicast_list = &set_multicast_list;
+
+    ether_setup(dev);
+        
+    return 0;
+}
+
+
+/* This page of functions should be 8390 generic */
+/* Follow National Semi's recommendations for initializing the "NIC". */
+void NS8390_init(struct device *dev, int startp)
+{
+    int e8390_base = dev->base_addr;
+    struct ei_device *ei_local = (struct ei_device *) dev->priv;
+    int i;
+    int endcfg = ei_local->word16 ? (0x48 | ENDCFG_WTS) : 0x48;
+    unsigned long flags;
+    
+    /* Follow National Semi's recommendations for initing the DP83902. */
+    outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base); /* 0x21 */
+    outb_p(endcfg, e8390_base + EN0_DCFG);	/* 0x48 or 0x49 */
+    /* Clear the remote byte count registers. */
+    outb_p(0x00,  e8390_base + EN0_RCNTLO);
+    outb_p(0x00,  e8390_base + EN0_RCNTHI);
+    /* Set to monitor and loopback mode -- this is vital!. */
+    outb_p(E8390_RXOFF, e8390_base + EN0_RXCR); /* 0x20 */
+    outb_p(E8390_TXOFF, e8390_base + EN0_TXCR); /* 0x02 */
+    /* Set the transmit page and receive ring. */
+    outb_p(ei_local->tx_start_page,	 e8390_base + EN0_TPSR);
+    ei_local->tx1 = ei_local->tx2 = 0;
+    outb_p(ei_local->rx_start_page,	 e8390_base + EN0_STARTPG);
+    outb_p(ei_local->stop_page-1, e8390_base + EN0_BOUNDARY); /* 3c503 says 0x3f,NS0x26*/
+    ei_local->current_page = ei_local->rx_start_page;		/* assert boundary+1 */
+    outb_p(ei_local->stop_page,	  e8390_base + EN0_STOPPG);
+    /* Clear the pending interrupts and mask. */
+    outb_p(0xFF, e8390_base + EN0_ISR);
+    outb_p(0x00,  e8390_base + EN0_IMR);
+    
+    /* Copy the station address into the DS8390 registers,
+       and set the multicast hash bitmap to receive all multicasts. */
+    save_flags(flags);
+    cli();
+    outb_p(E8390_NODMA + E8390_PAGE1 + E8390_STOP, e8390_base); /* 0x61 */
+    for(i = 0; i < 6; i++) {
+		outb_p(dev->dev_addr[i], e8390_base + EN1_PHYS + i);
+    }
+    /* Initialize the multicast list to accept-all.  If we enable multicast
+       the higher levels can do the filtering. */
+    for(i = 0; i < 8; i++)
+		outb_p(0xff, e8390_base + EN1_MULT + i);
+    
+    outb_p(ei_local->rx_start_page,	 e8390_base + EN1_CURPAG);
+    outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base);
+    restore_flags(flags);
+    dev->tbusy = 0;
+    dev->interrupt = 0;
+    ei_local->tx1 = ei_local->tx2 = 0;
+    ei_local->txing = 0;
+    if (startp) {
+		outb_p(0xff,  e8390_base + EN0_ISR);
+		outb_p(ENISR_ALL,  e8390_base + EN0_IMR);
+		outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base);
+		outb_p(E8390_TXCONFIG, e8390_base + EN0_TXCR); /* xmit on. */
+		/* 3c503 TechMan says rxconfig only after the NIC is started. */
+		outb_p(E8390_RXCONFIG,	e8390_base + EN0_RXCR); /* rx on,  */
+		dev->set_multicast_list(dev);		/* Get the multicast status right if this
+							   was a reset. */
+    }
+    return;
+}
+
+/* Trigger a transmit start, assuming the length is valid. */
+static void NS8390_trigger_send(struct device *dev, unsigned int length,
+								int start_page)
+{
+    int e8390_base = dev->base_addr;
+    
+    outb_p(E8390_NODMA+E8390_PAGE0, e8390_base);
+    
+    if (inb_p(e8390_base) & E8390_TRANS) {
+		printk("%s: trigger_send() called with the transmitter busy.\n",
+			   dev->name);
+		return;
+    }
+    outb_p(length & 0xff, e8390_base + EN0_TCNTLO);
+    outb_p(length >> 8, e8390_base + EN0_TCNTHI);
+    outb_p(start_page, e8390_base + EN0_TPSR);
+    outb_p(E8390_NODMA+E8390_TRANS+E8390_START, e8390_base);
+    return;
+}
+
+#ifdef MODULE
+
+int init_module(void)
+{
+     return 0;
+}
+
+void
+cleanup_module(void)
+{
+}
+#endif /* MODULE */
+
+/*
+ * Local variables:
+ *  compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -m486 -c 8390.c"
+ *  version-control: t
+ *  kept-new-versions: 5
+ *  c-indent-level: 4
+ *  tab-width: 4
+ * End:
+ */