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, 853 insertions, 0 deletions

diff --git a/linux/src/drivers/net/de600.c b/linux/src/drivers/net/de600.c
new file mode 100644
index 0000000..2488cd7
--- /dev/null
+++ b/linux/src/drivers/net/de600.c
@@ -0,0 +1,853 @@
+static const char *version =
+	"de600.c: $Revision: 1.1 $,  Bjorn Ekwall (bj0rn@blox.se)\n";
+/*
+ *	de600.c
+ *
+ *	Linux driver for the D-Link DE-600 Ethernet pocket adapter.
+ *
+ *	Portions (C) Copyright 1993, 1994 by Bjorn Ekwall
+ *	The Author may be reached as bj0rn@blox.se
+ *
+ *	Based on adapter information gathered from DE600.ASM by D-Link Inc.,
+ *	as included on disk C in the v.2.11 of PC/TCP from FTP Software.
+ *	For DE600.asm:
+ *		Portions (C) Copyright 1990 D-Link, Inc.
+ *		Copyright, 1988-1992, Russell Nelson, Crynwr Software
+ *
+ *	Adapted to the sample network driver core for linux,
+ *	written by: Donald Becker <becker@super.org>
+ *	C/O Supercomputing Research Ctr., 17100 Science Dr., Bowie MD 20715
+ *
+ *	compile-command:
+ *	"gcc -D__KERNEL__  -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer \
+ *	 -m486 -c de600.c
+ *
+ **************************************************************/
+/*
+ *	This program is free software; you can redistribute it and/or modify
+ *	it under the terms of the GNU General Public License as published by
+ *	the Free Software Foundation; either version 2, or (at your option)
+ *	any later version.
+ *
+ *	This program is distributed in the hope that it will be useful,
+ *	but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *	GNU General Public License for more details.
+ *
+ *	You should have received a copy of the GNU General Public License
+ *	along with this program; if not, write to the Free Software
+ *	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 
+ *
+ **************************************************************/
+/* Add another "; SLOW_DOWN_IO" here if your adapter won't work OK: */
+#define DE600_SLOW_DOWN SLOW_DOWN_IO; SLOW_DOWN_IO; SLOW_DOWN_IO
+
+ /*
+ * If you still have trouble reading/writing to the adapter,
+ * modify the following "#define": (see <asm/io.h> for more info)
+#define REALLY_SLOW_IO
+ */
+#define SLOW_IO_BY_JUMPING /* Looks "better" than dummy write to port 0x80 :-) */
+
+/*
+ * If you want to enable automatic continuous checking for the DE600,
+ * keep this #define enabled.
+ * It doesn't cost much per packet, so I think it is worth it!
+ * If you disagree, comment away the #define, and live with it...
+ *
+ */
+#define CHECK_LOST_DE600
+
+/*
+ * Enable this #define if you want the adapter to do a "ifconfig down" on
+ * itself when we have detected that something is possibly wrong with it.
+ * The default behaviour is to retry with "adapter_init()" until success.
+ * This should be used for debugging purposes only.
+ * (Depends on the CHECK_LOST_DE600 above)
+ *
+ */
+#define SHUTDOWN_WHEN_LOST
+
+/*
+ * See comment at "de600_rspace()"!
+ * This is an *ugly* hack, but for now it achieves its goal of
+ * faking a TCP flow-control that will not flood the poor DE600.
+ *
+ * Tricks TCP to announce a small max window (max 2 fast packets please :-)
+ *
+ * Comment away at your own risk!
+ *
+ * Update: Use the more general per-device maxwindow parameter instead.
+ */
+#undef FAKE_SMALL_MAX
+
+/* use 0 for production, 1 for verification, >2 for debug */
+#ifdef DE600_DEBUG
+#define PRINTK(x) if (de600_debug >= 2) printk x
+#else
+#define DE600_DEBUG 0
+#define PRINTK(x) /**/
+#endif
+unsigned int de600_debug = DE600_DEBUG;
+
+#include <linux/module.h>
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/string.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <asm/io.h>
+#include <linux/in.h>
+#include <linux/ptrace.h>
+#include <asm/system.h>
+#include <linux/errno.h>
+
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+
+#ifdef FAKE_SMALL_MAX
+static unsigned long de600_rspace(struct sock *sk);
+#include <net/sock.h>
+#endif
+
+#define netstats enet_statistics
+typedef unsigned char byte;
+
+/**************************************************
+ *                                                *
+ * Definition of D-Link Ethernet Pocket adapter   *
+ *                                                *
+ **************************************************/
+/*
+ * D-Link Ethernet pocket adapter ports
+ */
+/*
+ * OK, so I'm cheating, but there are an awful lot of
+ * reads and writes in order to get anything in and out
+ * of the DE-600 with 4 bits at a time in the parallel port,
+ * so every saved instruction really helps :-)
+ *
+ * That is, I don't care what the device struct says
+ * but hope that Space.c will keep the rest of the drivers happy.
+ */
+#ifndef DE600_IO
+#define DE600_IO 0x378
+#endif
+
+#define DATA_PORT	(DE600_IO)
+#define STATUS_PORT	(DE600_IO + 1)
+#define COMMAND_PORT	(DE600_IO + 2)
+
+#ifndef DE600_IRQ
+#define DE600_IRQ	7
+#endif
+/*
+ * It really should look like this, and autoprobing as well...
+ *
+#define DATA_PORT	(dev->base_addr + 0)
+#define STATUS_PORT	(dev->base_addr + 1)
+#define COMMAND_PORT	(dev->base_addr + 2)
+#define DE600_IRQ	dev->irq
+ */
+
+/*
+ * D-Link COMMAND_PORT commands
+ */
+#define SELECT_NIC	0x04 /* select Network Interface Card */
+#define SELECT_PRN	0x1c /* select Printer */
+#define NML_PRN		0xec /* normal Printer situation */
+#define IRQEN		0x10 /* enable IRQ line */
+
+/*
+ * D-Link STATUS_PORT
+ */
+#define RX_BUSY		0x80
+#define RX_GOOD		0x40
+#define TX_FAILED16	0x10
+#define TX_BUSY		0x08
+
+/*
+ * D-Link DATA_PORT commands
+ * command in low 4 bits
+ * data in high 4 bits
+ * select current data nibble with HI_NIBBLE bit
+ */
+#define WRITE_DATA	0x00 /* write memory */
+#define READ_DATA	0x01 /* read memory */
+#define STATUS		0x02 /* read  status register */
+#define COMMAND		0x03 /* write command register (see COMMAND below) */
+#define NULL_COMMAND	0x04 /* null command */
+#define RX_LEN		0x05 /* read  received packet length */
+#define TX_ADDR		0x06 /* set adapter transmit memory address */
+#define RW_ADDR		0x07 /* set adapter read/write memory address */
+#define HI_NIBBLE	0x08 /* read/write the high nibble of data,
+				or-ed with rest of command */
+
+/*
+ * command register, accessed through DATA_PORT with low bits = COMMAND
+ */
+#define RX_ALL		0x01 /* PROMISCUOUS */
+#define RX_BP		0x02 /* default: BROADCAST & PHYSICAL ADDRESS */
+#define RX_MBP		0x03 /* MULTICAST, BROADCAST & PHYSICAL ADDRESS */
+
+#define TX_ENABLE	0x04 /* bit 2 */
+#define RX_ENABLE	0x08 /* bit 3 */
+
+#define RESET		0x80 /* set bit 7 high */
+#define STOP_RESET	0x00 /* set bit 7 low */
+
+/*
+ * data to command register
+ * (high 4 bits in write to DATA_PORT)
+ */
+#define RX_PAGE2_SELECT	0x10 /* bit 4, only 2 pages to select */
+#define RX_BASE_PAGE	0x20 /* bit 5, always set when specifying RX_ADDR */
+#define FLIP_IRQ	0x40 /* bit 6 */
+
+/*
+ * D-Link adapter internal memory:
+ *
+ * 0-2K 1:st transmit page (send from pointer up to 2K)
+ * 2-4K	2:nd transmit page (send from pointer up to 4K)
+ *
+ * 4-6K 1:st receive page (data from 4K upwards)
+ * 6-8K 2:nd receive page (data from 6K upwards)
+ *
+ * 8K+	Adapter ROM (contains magic code and last 3 bytes of Ethernet address)
+ */
+#define MEM_2K		0x0800 /* 2048 */
+#define MEM_4K		0x1000 /* 4096 */
+#define MEM_6K		0x1800 /* 6144 */
+#define NODE_ADDRESS	0x2000 /* 8192 */
+
+#define RUNT 60		/* Too small Ethernet packet */
+
+/**************************************************
+ *                                                *
+ *             End of definition                  *
+ *                                                *
+ **************************************************/
+
+/*
+ * Index to functions, as function prototypes.
+ */
+/* Routines used internally. (See "convenience macros") */
+static byte	de600_read_status(struct device *dev);
+static byte	de600_read_byte(unsigned char type, struct device *dev);
+
+/* Put in the device structure. */
+static int	de600_open(struct device *dev);
+static int	de600_close(struct device *dev);
+static struct netstats *get_stats(struct device *dev);
+static int	de600_start_xmit(struct sk_buff *skb, struct device *dev);
+
+/* Dispatch from interrupts. */
+static void	de600_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+static int	de600_tx_intr(struct device *dev, int irq_status);
+static void	de600_rx_intr(struct device *dev);
+
+/* Initialization */
+static void	trigger_interrupt(struct device *dev);
+int		de600_probe(struct device *dev);
+static int	adapter_init(struct device *dev);
+
+/*
+ * D-Link driver variables:
+ */
+static volatile int		rx_page		= 0;
+
+#define TX_PAGES 2
+static volatile int		tx_fifo[TX_PAGES];
+static volatile int		tx_fifo_in = 0;
+static volatile int		tx_fifo_out = 0;
+static volatile int		free_tx_pages = TX_PAGES;
+static int			was_down = 0;
+
+/*
+ * Convenience macros/functions for D-Link adapter
+ */
+
+#define select_prn() outb_p(SELECT_PRN, COMMAND_PORT); DE600_SLOW_DOWN
+#define select_nic() outb_p(SELECT_NIC, COMMAND_PORT); DE600_SLOW_DOWN
+
+/* Thanks for hints from Mark Burton <markb@ordern.demon.co.uk> */
+#define de600_put_byte(data) ( \
+	outb_p(((data) << 4)   | WRITE_DATA            , DATA_PORT), \
+	outb_p(((data) & 0xf0) | WRITE_DATA | HI_NIBBLE, DATA_PORT))
+
+/*
+ * The first two outb_p()'s below could perhaps be deleted if there
+ * would be more delay in the last two. Not certain about it yet...
+ */
+#define de600_put_command(cmd) ( \
+	outb_p(( rx_page        << 4)   | COMMAND            , DATA_PORT), \
+	outb_p(( rx_page        & 0xf0) | COMMAND | HI_NIBBLE, DATA_PORT), \
+	outb_p(((rx_page | cmd) << 4)   | COMMAND            , DATA_PORT), \
+	outb_p(((rx_page | cmd) & 0xf0) | COMMAND | HI_NIBBLE, DATA_PORT))
+
+#define de600_setup_address(addr,type) ( \
+	outb_p((((addr) << 4) & 0xf0) | type            , DATA_PORT), \
+	outb_p(( (addr)       & 0xf0) | type | HI_NIBBLE, DATA_PORT), \
+	outb_p((((addr) >> 4) & 0xf0) | type            , DATA_PORT), \
+	outb_p((((addr) >> 8) & 0xf0) | type | HI_NIBBLE, DATA_PORT))
+
+#define rx_page_adr() ((rx_page & RX_PAGE2_SELECT)?(MEM_6K):(MEM_4K))
+
+/* Flip bit, only 2 pages */
+#define next_rx_page() (rx_page ^= RX_PAGE2_SELECT)
+
+#define tx_page_adr(a) (((a) + 1) * MEM_2K)
+
+static inline byte
+de600_read_status(struct device *dev)
+{
+	byte status;
+
+	outb_p(STATUS, DATA_PORT);
+	status = inb(STATUS_PORT);
+	outb_p(NULL_COMMAND | HI_NIBBLE, DATA_PORT);
+
+	return status;
+}
+
+static inline byte
+de600_read_byte(unsigned char type, struct device *dev) { /* dev used by macros */
+	byte lo;
+
+	(void)outb_p((type), DATA_PORT);
+	lo = ((unsigned char)inb(STATUS_PORT)) >> 4;
+	(void)outb_p((type) | HI_NIBBLE, DATA_PORT);
+	return ((unsigned char)inb(STATUS_PORT) & (unsigned char)0xf0) | lo;
+}
+
+/*
+ * Open/initialize the board.  This is called (in the current kernel)
+ * after booting when 'ifconfig <dev->name> $IP_ADDR' is run (in rc.inet1).
+ *
+ * This routine should set everything up anew at each open, even
+ * registers that "should" only need to be set once at boot, so that
+ * there is a non-reboot way to recover if something goes wrong.
+ */
+static int
+de600_open(struct device *dev)
+{
+	if (request_irq(DE600_IRQ, de600_interrupt, 0, "de600", NULL)) {
+		printk ("%s: unable to get IRQ %d\n", dev->name, DE600_IRQ);
+		return 1;
+	}
+	irq2dev_map[DE600_IRQ] = dev;
+
+	MOD_INC_USE_COUNT;
+	dev->start = 1;
+	if (adapter_init(dev)) {
+		return 1;
+	}
+
+	return 0;
+}
+
+/*
+ * The inverse routine to de600_open().
+ */
+static int
+de600_close(struct device *dev)
+{
+	select_nic();
+	rx_page = 0;
+	de600_put_command(RESET);
+	de600_put_command(STOP_RESET);
+	de600_put_command(0);
+	select_prn();
+
+	if (dev->start) {
+		free_irq(DE600_IRQ, NULL);
+		irq2dev_map[DE600_IRQ] = NULL;
+		dev->start = 0;
+		MOD_DEC_USE_COUNT;
+	}
+	return 0;
+}
+
+static struct netstats *
+get_stats(struct device *dev)
+{
+    return (struct netstats *)(dev->priv);
+}
+
+static inline void
+trigger_interrupt(struct device *dev)
+{
+	de600_put_command(FLIP_IRQ);
+	select_prn();
+	DE600_SLOW_DOWN;
+	select_nic();
+	de600_put_command(0);
+}
+
+/*
+ * Copy a buffer to the adapter transmit page memory.
+ * Start sending.
+ */
+static int
+de600_start_xmit(struct sk_buff *skb, struct device *dev)
+{
+	int	transmit_from;
+	int	len;
+	int	tickssofar;
+	byte	*buffer = skb->data;
+
+	/*
+	 * If some higher layer thinks we've missed a
+	 * tx-done interrupt we are passed NULL.
+	 * Caution: dev_tint() handles the cli()/sti() itself.
+	 */
+
+	if (skb == NULL) {
+		dev_tint(dev);
+		return 0;
+	}
+
+	if (free_tx_pages <= 0) {	/* Do timeouts, to avoid hangs. */
+		tickssofar = jiffies - dev->trans_start;
+
+		if (tickssofar < 5)
+			return 1;
+
+		/* else */
+		printk("%s: transmit timed out (%d), %s?\n",
+			dev->name,
+			tickssofar,
+			"network cable problem"
+			);
+		/* Restart the adapter. */
+		if (adapter_init(dev)) {
+			return 1;
+		}
+	}
+
+	/* Start real output */
+	PRINTK(("de600_start_xmit:len=%d, page %d/%d\n", skb->len, tx_fifo_in, free_tx_pages));
+
+	if ((len = skb->len) < RUNT)
+		len = RUNT;
+
+	cli();
+	select_nic();
+	tx_fifo[tx_fifo_in] = transmit_from = tx_page_adr(tx_fifo_in) - len;
+	tx_fifo_in = (tx_fifo_in + 1) % TX_PAGES; /* Next free tx page */
+
+#ifdef CHECK_LOST_DE600
+	/* This costs about 40 instructions per packet... */
+	de600_setup_address(NODE_ADDRESS, RW_ADDR);
+	de600_read_byte(READ_DATA, dev);
+	if (was_down || (de600_read_byte(READ_DATA, dev) != 0xde)) {
+		if (adapter_init(dev)) {
+			sti();
+			return 1;
+		}
+	}
+#endif
+
+	de600_setup_address(transmit_from, RW_ADDR);
+	for ( ; len > 0; --len, ++buffer)
+		de600_put_byte(*buffer);
+
+	if (free_tx_pages-- == TX_PAGES) { /* No transmission going on */
+		dev->trans_start = jiffies;
+		dev->tbusy = 0;	/* allow more packets into adapter */
+		/* Send page and generate a faked interrupt */
+		de600_setup_address(transmit_from, TX_ADDR);
+		de600_put_command(TX_ENABLE);
+	}
+	else {
+		dev->tbusy = !free_tx_pages;
+		select_prn();
+	}
+	
+	sti(); /* interrupts back on */
+	
+#ifdef FAKE_SMALL_MAX
+	/* This will "patch" the socket TCP proto at an early moment */
+	if (skb->sk && (skb->sk->protocol == IPPROTO_TCP) &&
+		(skb->sk->prot->rspace != &de600_rspace))
+		skb->sk->prot->rspace = de600_rspace; /* Ugh! */
+#endif
+
+	dev_kfree_skb (skb, FREE_WRITE);
+
+	return 0;
+}
+
+/*
+ * The typical workload of the driver:
+ * Handle the network interface interrupts.
+ */
+static void
+de600_interrupt(int irq, void *dev_id, struct pt_regs * regs)
+{
+	struct device	*dev = irq2dev_map[irq];
+	byte		irq_status;
+	int		retrig = 0;
+	int		boguscount = 0;
+
+	/* This might just as well be deleted now, no crummy drivers present :-) */
+	if ((dev == NULL) || (dev->start == 0) || (DE600_IRQ != irq)) {
+		printk("%s: bogus interrupt %d\n", dev?dev->name:"DE-600", irq);
+		return;
+	}
+
+	dev->interrupt = 1;
+	select_nic();
+	irq_status = de600_read_status(dev);
+
+	do {
+		PRINTK(("de600_interrupt (%02X)\n", irq_status));
+
+		if (irq_status & RX_GOOD)
+			de600_rx_intr(dev);
+		else if (!(irq_status & RX_BUSY))
+			de600_put_command(RX_ENABLE);
+
+		/* Any transmission in progress? */
+		if (free_tx_pages < TX_PAGES)
+			retrig = de600_tx_intr(dev, irq_status);
+		else
+			retrig = 0;
+
+		irq_status = de600_read_status(dev);
+	} while ( (irq_status & RX_GOOD) || ((++boguscount < 100) && retrig) );
+	/*
+	 * Yeah, it _looks_ like busy waiting, smells like busy waiting
+	 * and I know it's not PC, but please, it will only occur once
+	 * in a while and then only for a loop or so (< 1ms for sure!)
+	 */
+
+	/* Enable adapter interrupts */
+	dev->interrupt = 0;
+	select_prn();
+
+	if (retrig)
+		trigger_interrupt(dev);
+
+	sti();
+	return;
+}
+
+static int
+de600_tx_intr(struct device *dev, int irq_status)
+{
+	/*
+	 * Returns 1 if tx still not done
+	 */
+
+	mark_bh(NET_BH);
+	/* Check if current transmission is done yet */
+	if (irq_status & TX_BUSY)
+		return 1; /* tx not done, try again */
+
+	/* else */
+	/* If last transmission OK then bump fifo index */
+	if (!(irq_status & TX_FAILED16)) {
+		tx_fifo_out = (tx_fifo_out + 1) % TX_PAGES;
+		++free_tx_pages;
+		((struct netstats *)(dev->priv))->tx_packets++;
+		dev->tbusy = 0;
+	}
+
+	/* More to send, or resend last packet? */
+	if ((free_tx_pages < TX_PAGES) || (irq_status & TX_FAILED16)) {
+		dev->trans_start = jiffies;
+		de600_setup_address(tx_fifo[tx_fifo_out], TX_ADDR);
+		de600_put_command(TX_ENABLE);
+		return 1;
+	}
+	/* else */
+
+	return 0;
+}
+
+/*
+ * We have a good packet, get it out of the adapter.
+ */
+static void
+de600_rx_intr(struct device *dev)
+{
+	struct sk_buff	*skb;
+	int		i;
+	int		read_from;
+	int		size;
+	register unsigned char	*buffer;
+
+	cli();
+	/* Get size of received packet */
+	size = de600_read_byte(RX_LEN, dev);	/* low byte */
+	size += (de600_read_byte(RX_LEN, dev) << 8);	/* high byte */
+	size -= 4;	/* Ignore trailing 4 CRC-bytes */
+
+	/* Tell adapter where to store next incoming packet, enable receiver */
+	read_from = rx_page_adr();
+	next_rx_page();
+	de600_put_command(RX_ENABLE);
+	sti();
+
+	if ((size < 32)  ||  (size > 1535)) {
+		printk("%s: Bogus packet size %d.\n", dev->name, size);
+		if (size > 10000)
+			adapter_init(dev);
+		return;
+	}
+
+	skb = dev_alloc_skb(size+2);
+	sti();
+	if (skb == NULL) {
+		printk("%s: Couldn't allocate a sk_buff of size %d.\n",
+			dev->name, size);
+		return;
+	}
+	/* else */
+
+	skb->dev = dev;
+	skb_reserve(skb,2);	/* Align */
+	
+	/* 'skb->data' points to the start of sk_buff data area. */
+	buffer = skb_put(skb,size);
+
+	/* copy the packet into the buffer */
+	de600_setup_address(read_from, RW_ADDR);
+	for (i = size; i > 0; --i, ++buffer)
+		*buffer = de600_read_byte(READ_DATA, dev);
+	
+	((struct netstats *)(dev->priv))->rx_packets++; /* count all receives */
+
+	skb->protocol=eth_type_trans(skb,dev);
+	
+	netif_rx(skb);
+	/*
+	 * If any worth-while packets have been received, netif_rx()
+	 * has done a mark_bh(INET_BH) for us and will work on them
+	 * when we get to the bottom-half routine.
+	 */
+}
+
+int
+de600_probe(struct device *dev)
+{
+	int	i;
+	static struct netstats de600_netstats;
+	/*dev->priv = kmalloc(sizeof(struct netstats), GFP_KERNEL);*/
+
+	printk("%s: D-Link DE-600 pocket adapter", dev->name);
+	/* Alpha testers must have the version number to report bugs. */
+	if (de600_debug > 1)
+		printk(version);
+
+	/* probe for adapter */
+	rx_page = 0;
+	select_nic();
+	(void)de600_read_status(dev);
+	de600_put_command(RESET);
+	de600_put_command(STOP_RESET);
+	if (de600_read_status(dev) & 0xf0) {
+		printk(": not at I/O %#3x.\n", DATA_PORT);
+		return ENODEV;
+	}
+
+	/*
+	 * Maybe we found one,
+	 * have to check if it is a D-Link DE-600 adapter...
+	 */
+
+	/* Get the adapter ethernet address from the ROM */
+	de600_setup_address(NODE_ADDRESS, RW_ADDR);
+	for (i = 0; i < ETH_ALEN; i++) {
+		dev->dev_addr[i] = de600_read_byte(READ_DATA, dev);
+		dev->broadcast[i] = 0xff;
+	}
+
+	/* Check magic code */
+	if ((dev->dev_addr[1] == 0xde) && (dev->dev_addr[2] == 0x15)) {
+		/* OK, install real address */
+		dev->dev_addr[0] = 0x00;
+		dev->dev_addr[1] = 0x80;
+		dev->dev_addr[2] = 0xc8;
+		dev->dev_addr[3] &= 0x0f;
+		dev->dev_addr[3] |= 0x70;
+	} else {
+		printk(" not identified in the printer port\n");
+		return ENODEV;
+	}
+
+#if 0 /* Not yet */
+	if (check_region(DE600_IO, 3)) {
+		printk(", port 0x%x busy\n", DE600_IO);
+		return EBUSY;
+	}
+#endif
+	request_region(DE600_IO, 3, "de600");
+
+	printk(", Ethernet Address: %02X", dev->dev_addr[0]);
+	for (i = 1; i < ETH_ALEN; i++)
+		printk(":%02X",dev->dev_addr[i]);
+	printk("\n");
+
+	/* Initialize the device structure. */
+	/*dev->priv = kmalloc(sizeof(struct netstats), GFP_KERNEL);*/
+	dev->priv = &de600_netstats;
+
+	memset(dev->priv, 0, sizeof(struct netstats));
+	dev->get_stats = get_stats;
+
+	dev->open = de600_open;
+	dev->stop = de600_close;
+	dev->hard_start_xmit = &de600_start_xmit;
+
+	ether_setup(dev);
+	
+	dev->flags&=~IFF_MULTICAST;
+	
+	select_prn();
+	return 0;
+}
+
+static int
+adapter_init(struct device *dev)
+{
+	int	i;
+	long flags;
+
+	save_flags(flags);
+	cli();
+
+	select_nic();
+	rx_page = 0; /* used by RESET */
+	de600_put_command(RESET);
+	de600_put_command(STOP_RESET);
+#ifdef CHECK_LOST_DE600
+	/* Check if it is still there... */
+	/* Get the some bytes of the adapter ethernet address from the ROM */
+	de600_setup_address(NODE_ADDRESS, RW_ADDR);
+	de600_read_byte(READ_DATA, dev);
+	if ((de600_read_byte(READ_DATA, dev) != 0xde) ||
+	    (de600_read_byte(READ_DATA, dev) != 0x15)) {
+	/* was: if (de600_read_status(dev) & 0xf0) { */
+		printk("Something has happened to the DE-600!  Please check it"
+#ifdef SHUTDOWN_WHEN_LOST
+			" and do a new ifconfig"
+#endif /* SHUTDOWN_WHEN_LOST */
+			"!\n");
+#ifdef SHUTDOWN_WHEN_LOST
+		/* Goodbye, cruel world... */
+		dev->flags &= ~IFF_UP;
+		de600_close(dev);
+#endif /* SHUTDOWN_WHEN_LOST */
+		was_down = 1;
+		dev->tbusy = 1;		/* Transmit busy...  */
+		restore_flags(flags);
+		return 1; /* failed */
+	}
+#endif /* CHECK_LOST_DE600 */
+	if (was_down) {
+		printk("Thanks, I feel much better now!\n");
+		was_down = 0;
+	}
+
+	dev->tbusy = 0;		/* Transmit busy...  */
+	dev->interrupt = 0;
+	tx_fifo_in = 0;
+	tx_fifo_out = 0;
+	free_tx_pages = TX_PAGES;
+
+	/* set the ether address. */
+	de600_setup_address(NODE_ADDRESS, RW_ADDR);
+	for (i = 0; i < ETH_ALEN; i++)
+		de600_put_byte(dev->dev_addr[i]);
+
+	/* where to start saving incoming packets */
+	rx_page = RX_BP | RX_BASE_PAGE;
+	de600_setup_address(MEM_4K, RW_ADDR);
+	/* Enable receiver */
+	de600_put_command(RX_ENABLE);
+	select_prn();
+	restore_flags(flags);
+
+	return 0; /* OK */
+}
+
+#ifdef FAKE_SMALL_MAX
+/*
+ *	The new router code (coming soon 8-) ) will fix this properly.
+ */
+#define DE600_MIN_WINDOW 1024
+#define DE600_MAX_WINDOW 2048
+#define DE600_TCP_WINDOW_DIFF 1024
+/*
+ * Copied from "net/inet/sock.c"
+ *
+ * Sets a lower max receive window in order to achieve <= 2
+ * packets arriving at the adapter in fast succession.
+ * (No way that a DE-600 can keep up with a net saturated
+ *  with packets homing in on it :-( )
+ *
+ * Since there are only 2 receive buffers in the DE-600
+ * and it takes some time to copy from the adapter,
+ * this is absolutely necessary for any TCP performance whatsoever!
+ *
+ * Note that the returned window info will never be smaller than
+ * DE600_MIN_WINDOW, i.e. 1024
+ * This differs from the standard function, that can return an
+ * arbitrarily small window!
+ */
+#define min(a,b)	((a)<(b)?(a):(b))
+static unsigned long
+de600_rspace(struct sock *sk)
+{
+  int amt;
+
+  if (sk != NULL) {
+/*
+ * Hack! You might want to play with commenting away the following line,
+ * if you know what you do!
+  	sk->max_unacked = DE600_MAX_WINDOW - DE600_TCP_WINDOW_DIFF;
+ */
+
+	if (sk->rmem_alloc >= sk->rcvbuf-2*DE600_MIN_WINDOW) return(0);
+	amt = min((sk->rcvbuf-sk->rmem_alloc)/2/*-DE600_MIN_WINDOW*/, DE600_MAX_WINDOW);
+	if (amt < 0) return(0);
+	return(amt);
+  }
+  return(0);
+}
+#endif
+
+#ifdef MODULE
+static char nullname[8];
+static struct device de600_dev = {
+	nullname, 0, 0, 0, 0, 0, 0, 0, 0, 0, NULL, de600_probe };
+
+int
+init_module(void)
+{
+	if (register_netdev(&de600_dev) != 0)
+		return -EIO;
+	return 0;
+}
+
+void
+cleanup_module(void)
+{
+	unregister_netdev(&de600_dev);
+	release_region(DE600_IO, 3);
+}
+#endif /* MODULE */
+/*
+ * Local variables:
+ *  kernel-compile-command: "gcc -D__KERNEL__ -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de600.c"
+ *  module-compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de600.c"
+ *  compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de600.c"
+ * End:
+ */