New parallel port support for PC98. Old PC98s which have

uni-directional parallel port should use olpt driver instead of lpt
driver.

Files ppc.c and ppcreg.h are copied form i386/isa directory with PC98
change.

Submitted by:	Akio Morita <amorita@meadow.scphys.kyoto-u.ac.jp>

1 files changed, 1473 insertions, 0 deletions

diff --git a/sys/pc98/cbus/olpt.c b/sys/pc98/cbus/olpt.c
new file mode 100644
index 0000000..57caf91
--- /dev/null
+++ b/sys/pc98/cbus/olpt.c
@@ -0,0 +1,1473 @@
+/*
+ * Copyright (c) 1990 William F. Jolitz, TeleMuse
+ * 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 software is a component of "386BSD" developed by
+ *	William F. Jolitz, TeleMuse.
+ * 4. Neither the name of the developer nor the name "386BSD"
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ
+ * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS
+ * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT.
+ * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT
+ * NOT MAKE USE OF THIS WORK.
+ *
+ * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED
+ * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN
+ * REFERENCES SUCH AS THE  "PORTING UNIX TO THE 386" SERIES
+ * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING
+ * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND
+ * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE
+ * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS
+ * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``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 THE DEVELOPER 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.
+ *
+ *	from: unknown origin, 386BSD 0.1
+ *	$Id$
+ */
+
+/*
+ * Device Driver for AT parallel printer port
+ * Written by William Jolitz 12/18/90
+ */
+
+/*
+ * Parallel port TCP/IP interfaces added.  I looked at the driver from
+ * MACH but this is a complete rewrite, and btw. incompatible, and it
+ * should perform better too.  I have never run the MACH driver though.
+ *
+ * This driver sends two bytes (0x08, 0x00) in front of each packet,
+ * to allow us to distinguish another format later.
+ *
+ * Now added an Linux/Crynwr compatibility mode which is enabled using
+ * IF_LINK0 - Tim Wilkinson.
+ *
+ * TODO:
+ *    Make HDLC/PPP mode, use IF_LLC1 to enable.
+ *
+ * Connect the two computers using a Laplink parallel cable to use this
+ * feature:
+ *
+ *      +----------------------------------------+
+ * 	|A-name	A-End	B-End	Descr.	Port/Bit |
+ *      +----------------------------------------+
+ *	|DATA0	2	15	Data	0/0x01   |
+ *	|-ERROR	15	2	   	1/0x08   |
+ *      +----------------------------------------+
+ *	|DATA1	3	13	Data	0/0x02	 |
+ *	|+SLCT	13	3	   	1/0x10   |
+ *      +----------------------------------------+
+ *	|DATA2	4	12	Data	0/0x04   |
+ *	|+PE	12	4	   	1/0x20   |
+ *      +----------------------------------------+
+ *	|DATA3	5	10	Strobe	0/0x08   |
+ *	|-ACK	10	5	   	1/0x40   |
+ *      +----------------------------------------+
+ *	|DATA4	6	11	Data	0/0x10   |
+ *	|BUSY	11	6	   	1/~0x80  |
+ *      +----------------------------------------+
+ *	|GND	18-25	18-25	GND	-        |
+ *      +----------------------------------------+
+ *
+ * Expect transfer-rates up to 75 kbyte/sec.
+ *
+ * If GCC could correctly grok
+ *	register int port asm("edx")
+ * the code would be cleaner
+ *
+ * Poul-Henning Kamp <phk@freebsd.org>
+ */
+
+#include "olpt.h"
+#include "opt_devfs.h"
+#include "opt_inet.h"
+#ifdef PC98
+#undef INET	/* PLIP is not supported for old PC-98 */
+#endif
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/conf.h>
+#include <sys/buf.h>
+#include <sys/kernel.h>
+#include <sys/uio.h>
+#include <sys/syslog.h>
+#ifdef DEVFS
+#include <sys/devfsext.h>
+#endif /*DEVFS*/
+
+#include <machine/clock.h>
+#include <machine/lpt.h>
+
+#include <vm/vm.h>
+#include <vm/vm_param.h>
+#include <vm/pmap.h>
+
+#ifdef PC98
+#include <pc98/pc98/pc98.h>
+#else
+#include <i386/isa/isa.h>
+#endif
+#include <i386/isa/isa_device.h>
+#include <i386/isa/lptreg.h>
+
+#ifdef INET
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#include <sys/socket.h>
+#include <sys/sockio.h>
+
+#include <net/if.h>
+#include <net/if_types.h>
+#include <net/netisr.h>
+#include <netinet/in.h>
+#include <netinet/in_var.h>
+#include "bpfilter.h"
+#if NBPFILTER > 0
+#include <net/bpf.h>
+#endif
+#endif /* INET */
+
+
+#define	LPINITRDY	4	/* wait up to 4 seconds for a ready */
+#define	LPTOUTINITIAL	10	/* initial timeout to wait for ready 1/10 s */
+#define	LPTOUTMAX	1	/* maximal timeout 1 s */
+#define	LPPRI		(PZERO+8)
+#define	BUFSIZE		1024
+
+#ifdef INET
+#ifndef LPMTU			/* MTU for the lp# interfaces */
+#define	LPMTU	1500
+#endif
+
+#ifndef LPMAXSPIN1		/* DELAY factor for the lp# interfaces */
+#define	LPMAXSPIN1	8000   /* Spinning for remote intr to happen */
+#endif
+
+#ifndef LPMAXSPIN2		/* DELAY factor for the lp# interfaces */
+#define	LPMAXSPIN2	500	/* Spinning for remote handshake to happen */
+#endif
+
+#ifndef LPMAXERRS		/* Max errors before !RUNNING */
+#define	LPMAXERRS	100
+#endif
+
+#define CLPIPHDRLEN	14	/* We send dummy ethernet addresses (two) + packet type in front of packet */
+#define	CLPIP_SHAKE	0x80	/* This bit toggles between nibble reception */
+#define MLPIPHDRLEN	CLPIPHDRLEN
+
+#define LPIPHDRLEN	2	/* We send 0x08, 0x00 in front of packet */
+#define	LPIP_SHAKE	0x40	/* This bit toggles between nibble reception */
+#if !defined(MLPIPHDRLEN) || LPIPHDRLEN > MLPIPHDRLEN
+#define MLPIPHDRLEN	LPIPHDRLEN
+#endif
+
+#define	LPIPTBLSIZE	256	/* Size of octet translation table */
+
+#endif /* INET */
+
+#ifndef PC98
+/* BIOS printer list - used by BIOS probe*/
+#define	BIOS_LPT_PORTS	0x408
+#define	BIOS_PORTS	(short *)(KERNBASE+BIOS_LPT_PORTS)
+#define	BIOS_MAX_LPT	4
+#endif
+
+
+#ifndef DEBUG
+#define lprintf(args)
+#else
+#define lprintf(args)	do {				\
+				if (lptflag)		\
+					printf args;	\
+			} while (0)
+static int volatile lptflag = 1;
+#endif
+
+#define	LPTUNIT(s)	((s)&0x03)
+#define	LPTFLAGS(s)	((s)&0xfc)
+
+static struct lpt_softc {
+	int	sc_port;
+	short	sc_state;
+	/* default case: negative prime, negative ack, handshake strobe,
+	   prime once */
+	u_char	sc_control;
+	char	sc_flags;
+#define LP_POS_INIT	0x04	/* if we are a postive init signal */
+#define LP_POS_ACK	0x08	/* if we are a positive going ack */
+#define LP_NO_PRIME	0x10	/* don't prime the printer at all */
+#define LP_PRIMEOPEN	0x20	/* prime on every open */
+#define LP_AUTOLF	0x40	/* tell printer to do an automatic lf */
+#define LP_BYPASS	0x80	/* bypass  printer ready checks */
+	struct	buf *sc_inbuf;
+	short	sc_xfercnt ;
+	char	sc_primed;
+	char	*sc_cp ;
+	u_char	sc_irq ;	/* IRQ status of port */
+#define LP_HAS_IRQ	0x01	/* we have an irq available */
+#define LP_USE_IRQ	0x02	/* we are using our irq */
+#define LP_ENABLE_IRQ	0x04	/* enable IRQ on open */
+	u_char	sc_backoff ;	/* time to call lptout() again */
+
+#ifdef INET
+	struct  ifnet	sc_if;
+	u_char		*sc_ifbuf;
+	int		sc_iferrs;
+#endif
+#ifdef DEVFS
+	void	*devfs_token;
+	void	*devfs_token_ctl;
+#endif
+} lpt_sc[NOLPT] ;
+
+/* bits for state */
+#define	OPEN		(1<<0)	/* device is open */
+#define	ASLP		(1<<1)	/* awaiting draining of printer */
+#define	ERROR		(1<<2)	/* error was received from printer */
+#define	OBUSY		(1<<3)	/* printer is busy doing output */
+#define LPTOUT		(1<<4)	/* timeout while not selected */
+#define TOUT		(1<<5)	/* timeout while not selected */
+#define INIT		(1<<6)	/* waiting to initialize for open */
+#define INTERRUPTED	(1<<7)	/* write call was interrupted */
+
+
+/* status masks to interrogate printer status */
+#define RDY_MASK	(LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)	/* ready ? */
+#define LP_READY	(LPS_SEL|LPS_NBSY|LPS_NERR)
+
+/* Printer Ready condition  - from lpa.c */
+/* Only used in polling code */
+#ifdef PC98
+#define	NOT_READY(x)	((inb(x) & LPS_NBSY) != LPS_NBSY)
+#else	/* IBM-PC */
+#define	LPS_INVERT	(LPS_NBSY | LPS_NACK |           LPS_SEL | LPS_NERR)
+#define	LPS_MASK	(LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR)
+#define	NOT_READY(x)	((inb(x)^LPS_INVERT)&LPS_MASK)
+#endif
+
+#define	MAX_SLEEP	(hz*5)	/* Timeout while waiting for device ready */
+#define	MAX_SPIN	20	/* Max delay for device ready in usecs */
+
+static timeout_t lptout;
+static int	lptprobe (struct isa_device *dvp);
+static int	lptattach (struct isa_device *isdp);
+static ointhand2_t	lptintr;
+
+#ifdef INET
+
+/* Tables for the lp# interface */
+static u_char *txmith;
+#define txmitl (txmith+(1*LPIPTBLSIZE))
+#define trecvh (txmith+(2*LPIPTBLSIZE))
+#define trecvl (txmith+(3*LPIPTBLSIZE))
+
+static u_char *ctxmith;
+#define ctxmitl (ctxmith+(1*LPIPTBLSIZE))
+#define ctrecvh (ctxmith+(2*LPIPTBLSIZE))
+#define ctrecvl (ctxmith+(3*LPIPTBLSIZE))
+
+/* Functions for the lp# interface */
+static void lpattach(struct lpt_softc *,int);
+#ifndef PC98
+static int lpinittables(void);
+#endif
+static int lpioctl(struct ifnet *, u_long, caddr_t);
+static int lpoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
+	struct rtentry *);
+static void lpintr(int);
+#endif /* INET */
+
+struct	isa_driver olptdriver = {
+	lptprobe, lptattach, "olpt"
+};
+
+static	d_open_t	lptopen;
+static	d_close_t	lptclose;
+static	d_write_t	lptwrite;
+static	d_ioctl_t	lptioctl;
+
+#define CDEV_MAJOR 16
+static struct cdevsw lpt_cdevsw = {
+	/* open */	lptopen,
+	/* close */	lptclose,
+	/* read */	noread,
+	/* write */	lptwrite,
+	/* ioctl */	lptioctl,
+	/* stop */	nostop,
+	/* reset */	noreset,
+	/* devtotty */	nodevtotty,
+	/* poll */	nopoll,
+	/* mmap */	nommap,
+	/* strategy */	nostrategy,
+	/* name */	"lpt",
+	/* parms */	noparms,
+	/* maj */	CDEV_MAJOR,
+	/* dump */	nodump,
+	/* psize */	nopsize,
+	/* flags */	0,
+	/* maxio */	0,
+	/* bmaj */	-1
+};
+
+#ifndef PC98
+/*
+ * Internal routine to lptprobe to do port tests of one byte value
+ */
+static int
+lpt_port_test (int port, u_char data, u_char mask)
+{
+	int	temp, timeout;
+
+	data = data & mask;
+	outb(port, data);
+	timeout = 10000;
+	do {
+		DELAY(10);
+		temp = inb(port) & mask;
+	}
+	while (temp != data && --timeout);
+	lprintf(("Port 0x%x\tout=%x\tin=%x\ttout=%d\n",
+		port, data, temp, timeout));
+	return (temp == data);
+}
+#endif /* PC98 */
+
+/*
+ * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94
+ * Based partially on Rod Grimes' printer probe
+ *
+ * Logic:
+ *	1) If no port address was given, use the bios detected ports
+ *	   and autodetect what ports the printers are on.
+ *	2) Otherwise, probe the data port at the address given,
+ *	   using the method in Rod Grimes' port probe.
+ *	   (Much code ripped off directly from Rod's probe.)
+ *
+ * Comments from Rod's probe:
+ * Logic:
+ *	1) You should be able to write to and read back the same value
+ *	   to the data port.  Do an alternating zeros, alternating ones,
+ *	   walking zero, and walking one test to check for stuck bits.
+ *
+ *	2) You should be able to write to and read back the same value
+ *	   to the control port lower 5 bits, the upper 3 bits are reserved
+ *	   per the IBM PC technical reference manauls and different boards
+ *	   do different things with them.  Do an alternating zeros, alternating
+ *	   ones, walking zero, and walking one test to check for stuck bits.
+ *
+ *	   Some printers drag the strobe line down when the are powered off
+ * 	   so this bit has been masked out of the control port test.
+ *
+ *	   XXX Some printers may not like a fast pulse on init or strobe, I
+ *	   don't know at this point, if that becomes a problem these bits
+ *	   should be turned off in the mask byte for the control port test.
+ *
+ *	   We are finally left with a mask of 0x14, due to some printers
+ *	   being adamant about holding other bits high ........
+ *
+ *	   Before probing the control port, we write a 0 to the data port -
+ *	   If not, some printers chuck out garbage when the strobe line
+ *	   gets toggled.
+ *
+ *	3) Set the data and control ports to a value of 0
+ *
+ *	This probe routine has been tested on Epson Lx-800, HP LJ3P,
+ *	Epson FX-1170 and C.Itoh 8510RM
+ *	printers.
+ *	Quick exit on fail added.
+ */
+
+int
+lptprobe(struct isa_device *dvp)
+{
+#ifdef PC98
+#define PC98_OLD_LPT 0x40
+#define PC98_IEEE_1284_FUNCTION 0x149
+	unsigned int pc98_ieee_mode, tmp;
+
+	if (dvp->id_iobase == PC98_OLD_LPT) {
+		tmp = inb(PC98_IEEE_1284_FUNCTION);
+		pc98_ieee_mode = tmp;
+		if ((tmp & 0x10) == 0x10) {
+			outb(PC98_IEEE_1284_FUNCTION, tmp & ~0x10);
+			tmp = inb(PC98_IEEE_1284_FUNCTION);
+			if ((tmp & 0x10) != 0x10) {
+				outb(PC98_IEEE_1284_FUNCTION, pc98_ieee_mode);
+				return 0;
+			}
+		}
+	}
+	return 8;
+#else
+	int		port;
+	static short	next_bios_lpt = 0;
+	int		status;
+	static u_char	testbyte[18] = {
+		0x55,			/* alternating zeros */
+		0xaa,			/* alternating ones */
+		0xfe, 0xfd, 0xfb, 0xf7,
+		0xef, 0xdf, 0xbf, 0x7f,	/* walking zero */
+		0x01, 0x02, 0x04, 0x08,
+		0x10, 0x20, 0x40, 0x80	/* walking one */
+	};
+	int		i;
+
+	/*
+	 * Make sure there is some way for lptopen to see that
+	 * the port is not configured
+	 * This 0 will remain if the port isn't attached
+	 */
+	(lpt_sc + dvp->id_unit)->sc_port = 0;
+
+	status = IO_LPTSIZE;
+	/* If port not specified, use bios list */
+	if(dvp->id_iobase < 0) {	/* port? */
+		if((next_bios_lpt < BIOS_MAX_LPT) &&
+				(*(BIOS_PORTS+next_bios_lpt) != 0) ) {
+			dvp->id_iobase = *(BIOS_PORTS+next_bios_lpt++);
+			goto end_probe;
+		} else
+			return (0);
+	}
+
+	/* Port was explicitly specified */
+	/* This allows probing of ports unknown to the BIOS */
+	port = dvp->id_iobase + lpt_data;
+	for (i = 0; i < 18; i++) {
+		if (!lpt_port_test(port, testbyte[i], 0xff)) {
+			status = 0;
+			goto end_probe;
+		}
+	}
+
+end_probe:
+	/* write 0's to control and data ports */
+	outb(dvp->id_iobase+lpt_data, 0);
+	outb(dvp->id_iobase+lpt_control, 0);
+
+	return (status);
+#endif
+}
+
+/* XXX Todo - try and detect if interrupt is working */
+int
+lptattach(struct isa_device *isdp)
+{
+	struct	lpt_softc	*sc;
+	int	unit;
+
+	isdp->id_ointr = lptintr;
+	unit = isdp->id_unit;
+	sc = lpt_sc + unit;
+	sc->sc_port = isdp->id_iobase;
+	sc->sc_primed = 0;	/* not primed yet */
+#ifdef PC98
+	outb(sc->sc_port+lpt_pstb_ctrl,	LPC_DIS_PSTB);	/* PSTB disable */
+	outb(sc->sc_port+lpt_control,	LPC_MODE8255);	/* 8255 mode set */
+	outb(sc->sc_port+lpt_control,	LPC_NIRQ8);	/* IRQ8 inactive */
+	outb(sc->sc_port+lpt_control,	LPC_NPSTB);	/* PSTB inactive */
+	outb(sc->sc_port+lpt_pstb_ctrl,	LPC_EN_PSTB);	/* PSTB enable */
+#else
+	outb(sc->sc_port+lpt_control, LPC_NINIT);
+#endif
+
+	/* check if we can use interrupt */
+	lprintf(("oldirq %x\n", sc->sc_irq));
+	if (isdp->id_irq) {
+		sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ;
+		printf("lpt%d: Interrupt-driven port\n", unit);
+#ifdef INET
+		lpattach(sc, unit);
+#endif
+	} else {
+		sc->sc_irq = 0;
+		lprintf(("lpt%d: Polled port\n", unit));
+	}
+	lprintf(("irq %x\n", sc->sc_irq));
+
+#ifdef DEVFS
+	/* XXX what to do about the flags in the minor number? */
+	sc->devfs_token = devfs_add_devswf(&lpt_cdevsw,
+		unit, DV_CHR,
+		UID_ROOT, GID_WHEEL, 0600, "lpt%d", unit);
+	sc->devfs_token_ctl = devfs_add_devswf(&lpt_cdevsw,
+		unit | LP_BYPASS, DV_CHR,
+		UID_ROOT, GID_WHEEL, 0600, "lpctl%d", unit);
+#endif
+	return (1);
+}
+
+/*
+ * lptopen -- reset the printer, then wait until it's selected and not busy.
+ *	If LP_BYPASS flag is selected, then we do not try to select the
+ *	printer -- this is just used for passing ioctls.
+ */
+
+static	int
+lptopen (dev_t dev, int flags, int fmt, struct proc *p)
+{
+	struct lpt_softc *sc;
+	int s;
+#ifdef PC98
+	int port;
+#else
+	int trys, port;
+#endif
+	u_int unit = LPTUNIT(minor(dev));
+
+	sc = lpt_sc + unit;
+	if ((unit >= NOLPT) || (sc->sc_port == 0))
+		return (ENXIO);
+
+#ifdef INET
+	if (sc->sc_if.if_flags & IFF_UP)
+		return(EBUSY);
+#endif
+
+	if (sc->sc_state) {
+		lprintf(("lp: still open %x\n", sc->sc_state));
+		return(EBUSY);
+	} else
+		sc->sc_state |= INIT;
+
+	sc->sc_flags = LPTFLAGS(minor(dev));
+
+	/* Check for open with BYPASS flag set. */
+	if (sc->sc_flags & LP_BYPASS) {
+		sc->sc_state = OPEN;
+		return(0);
+	}
+
+	s = spltty();
+	lprintf(("lp flags 0x%x\n", sc->sc_flags));
+	port = sc->sc_port;
+
+	/* set IRQ status according to ENABLE_IRQ flag */
+	if (sc->sc_irq & LP_ENABLE_IRQ)
+		sc->sc_irq |= LP_USE_IRQ;
+	else
+		sc->sc_irq &= ~LP_USE_IRQ;
+
+	/* init printer */
+#ifndef PC98
+	if ((sc->sc_flags & LP_NO_PRIME) == 0) {
+		if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) {
+			outb(port+lpt_control, 0);
+			sc->sc_primed++;
+			DELAY(500);
+		}
+	}
+
+	outb (port+lpt_control, LPC_SEL|LPC_NINIT);
+
+	/* wait till ready (printer running diagnostics) */
+	trys = 0;
+	do {
+		/* ran out of waiting for the printer */
+		if (trys++ >= LPINITRDY*4) {
+			splx(s);
+			sc->sc_state = 0;
+			lprintf(("status %x\n", inb(port+lpt_status)));
+			return (EBUSY);
+		}
+
+		/* wait 1/4 second, give up if we get a signal */
+		if (tsleep ((caddr_t)sc, LPPRI|PCATCH, "lptinit", hz/4) !=
+		    EWOULDBLOCK) {
+			sc->sc_state = 0;
+			splx(s);
+			return (EBUSY);
+		}
+
+		/* is printer online and ready for output */
+	} while ((inb(port+lpt_status) & (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
+		 (LPS_SEL|LPS_NBSY|LPS_NERR));
+
+	sc->sc_control = LPC_SEL|LPC_NINIT;
+	if (sc->sc_flags & LP_AUTOLF)
+		sc->sc_control |= LPC_AUTOL;
+
+	/* enable interrupt if interrupt-driven */
+	if (sc->sc_irq & LP_USE_IRQ)
+		sc->sc_control |= LPC_ENA;
+
+	outb(port+lpt_control, sc->sc_control);
+#endif
+
+	sc->sc_state = OPEN;
+	sc->sc_inbuf = geteblk(BUFSIZE);
+	sc->sc_xfercnt = 0;
+	splx(s);
+
+	/* only use timeout if using interrupt */
+	lprintf(("irq %x\n", sc->sc_irq));
+	if (sc->sc_irq & LP_USE_IRQ) {
+		sc->sc_state |= TOUT;
+		timeout (lptout, (caddr_t)sc,
+			 (sc->sc_backoff = hz/LPTOUTINITIAL));
+	}
+
+	lprintf(("opened.\n"));
+	return(0);
+}
+
+static void
+lptout (void *arg)
+{
+	struct lpt_softc *sc = arg;
+	int pl;
+
+	lprintf(("T %x ", inb(sc->sc_port+lpt_status)));
+	if (sc->sc_state & OPEN) {
+		sc->sc_backoff++;
+		if (sc->sc_backoff > hz/LPTOUTMAX)
+			sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX;
+		timeout (lptout, (caddr_t)sc, sc->sc_backoff);
+	} else
+		sc->sc_state &= ~TOUT;
+
+	if (sc->sc_state & ERROR)
+		sc->sc_state &= ~ERROR;
+
+	/*
+	 * Avoid possible hangs do to missed interrupts
+	 */
+	if (sc->sc_xfercnt) {
+		pl = spltty();
+		lptintr(sc - lpt_sc);
+		splx(pl);
+	} else {
+		sc->sc_state &= ~OBUSY;
+		wakeup((caddr_t)sc);
+	}
+}
+
+/*
+ * lptclose -- close the device, free the local line buffer.
+ *
+ * Check for interrupted write call added.
+ */
+
+static	int
+lptclose(dev_t dev, int flags, int fmt, struct proc *p)
+{
+	struct lpt_softc *sc = lpt_sc + LPTUNIT(minor(dev));
+#ifndef PC98
+	int port = sc->sc_port;
+#endif
+
+	if(sc->sc_flags & LP_BYPASS)
+		goto end_close;
+
+	sc->sc_state &= ~OPEN;
+
+#ifndef PC98
+	/* if the last write was interrupted, don't complete it */
+	if((!(sc->sc_state  & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ))
+		while ((inb(port+lpt_status) & (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
+			(LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt)
+			/* wait 1/4 second, give up if we get a signal */
+			if (tsleep ((caddr_t)sc, LPPRI|PCATCH,
+				"lpclose", hz) != EWOULDBLOCK)
+				break;
+
+	outb(sc->sc_port+lpt_control, LPC_NINIT);
+#endif
+	brelse(sc->sc_inbuf);
+
+end_close:
+	sc->sc_state = 0;
+	sc->sc_xfercnt = 0;
+	lprintf(("closed.\n"));
+	return(0);
+}
+
+/*
+ * pushbytes()
+ *	Workhorse for actually spinning and writing bytes to printer
+ *	Derived from lpa.c
+ *	Originally by ?
+ *
+ *	This code is only used when we are polling the port
+ */
+static int
+pushbytes(struct lpt_softc * sc)
+{
+	int spin, err, tic;
+	char ch;
+	int port = sc->sc_port;
+
+	lprintf(("p"));
+	/* loop for every character .. */
+	while (sc->sc_xfercnt > 0) {
+		/* printer data */
+		ch = *(sc->sc_cp);
+		sc->sc_cp++;
+		sc->sc_xfercnt--;
+
+		/*
+		 * Wait for printer ready.
+		 * Loop 20 usecs testing BUSY bit, then sleep
+		 * for exponentially increasing timeout. (vak)
+		 */
+		for (spin=0; NOT_READY(port+lpt_status) && spin<MAX_SPIN; ++spin)
+			DELAY(1);	/* XXX delay is NOT this accurate! */
+		if (spin >= MAX_SPIN) {
+			tic = 0;
+			while (NOT_READY(port+lpt_status)) {
+				/*
+				 * Now sleep, every cycle a
+				 * little longer ..
+				 */
+				tic = tic + tic + 1;
+				/*
+				 * But no more than 10 seconds. (vak)
+				 */
+				if (tic > MAX_SLEEP)
+					tic = MAX_SLEEP;
+				err = tsleep((caddr_t)sc, LPPRI,
+					"lptpoll", tic);
+				if (err != EWOULDBLOCK) {
+					return (err);
+				}
+			}
+		}
+
+		/* output data */
+		outb(port+lpt_data, ch);
+#ifdef PC98
+		DELAY(1);
+		outb(port+lpt_control, LPC_PSTB);
+		DELAY(1);
+		outb(port+lpt_control, LPC_NPSTB);
+#else
+		/* strobe */
+		outb(port+lpt_control, sc->sc_control|LPC_STB);
+		outb(port+lpt_control, sc->sc_control);
+#endif
+
+	}
+	return(0);
+}
+
+/*
+ * lptwrite --copy a line from user space to a local buffer, then call
+ * putc to get the chars moved to the output queue.
+ *
+ * Flagging of interrupted write added.
+ */
+
+static	int
+lptwrite(dev_t dev, struct uio * uio, int ioflag)
+{
+	register unsigned n;
+	int pl, err;
+	struct lpt_softc *sc = lpt_sc + LPTUNIT(minor(dev));
+
+	if(sc->sc_flags & LP_BYPASS) {
+		/* we can't do writes in bypass mode */
+		return(EPERM);
+	}
+
+	sc->sc_state &= ~INTERRUPTED;
+	while ((n = min(BUFSIZE, uio->uio_resid)) != 0) {
+		sc->sc_cp = sc->sc_inbuf->b_data ;
+		uiomove(sc->sc_cp, n, uio);
+		sc->sc_xfercnt = n ;
+		while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) {
+			lprintf(("i"));
+			/* if the printer is ready for a char, */
+			/* give it one */
+			if ((sc->sc_state & OBUSY) == 0){
+				lprintf(("\nC %d. ", sc->sc_xfercnt));
+				pl = spltty();
+				lptintr(sc - lpt_sc);
+				(void) splx(pl);
+			}
+			lprintf(("W "));
+			if (sc->sc_state & OBUSY)
+				if ((err = tsleep ((caddr_t)sc,
+					 LPPRI|PCATCH, "lpwrite", 0))) {
+					sc->sc_state |= INTERRUPTED;
+					return(err);
+				}
+		}
+		/* check to see if we must do a polled write */
+		if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) {
+			lprintf(("p"));
+			if((err = pushbytes(sc)))
+				return(err);
+		}
+	}
+	return(0);
+}
+
+/*
+ * lptintr -- handle printer interrupts which occur when the printer is
+ * ready to accept another char.
+ *
+ * do checking for interrupted write call.
+ */
+
+static void
+lptintr(int unit)
+{
+	struct lpt_softc *sc = lpt_sc + unit;
+#ifndef PC98
+	int port = sc->sc_port, sts;
+	int i;
+#endif
+
+#ifdef INET
+	if(sc->sc_if.if_flags & IFF_UP) {
+	    lpintr(unit);
+	    return;
+	}
+#endif /* INET */
+
+#ifndef PC98
+	/*
+	 * Is printer online and ready for output?
+	 *
+	 * Avoid falling back to lptout() too quickly.  First spin-loop
+	 * to see if the printer will become ready ``really soon now''.
+	 */
+	for (i = 0;
+	     i < 100 &&
+	     ((sts=inb(port+lpt_status)) & RDY_MASK) != LP_READY;
+	     i++) ;
+	if ((sts & RDY_MASK) == LP_READY) {
+		sc->sc_state = (sc->sc_state | OBUSY) & ~ERROR;
+		sc->sc_backoff = hz/LPTOUTINITIAL;
+
+		if (sc->sc_xfercnt) {
+			/* send char */
+			/*lprintf(("%x ", *sc->sc_cp)); */
+			outb(port+lpt_data, *sc->sc_cp++) ;
+			outb(port+lpt_control, sc->sc_control|LPC_STB);
+			/* DELAY(X) */
+			outb(port+lpt_control, sc->sc_control);
+
+			/* any more data for printer */
+			if(--(sc->sc_xfercnt) > 0) return;
+		}
+
+		/*
+		 * No more data waiting for printer.
+		 * Wakeup is not done if write call was interrupted.
+		 */
+		sc->sc_state &= ~OBUSY;
+		if(!(sc->sc_state & INTERRUPTED))
+			wakeup((caddr_t)sc);
+		lprintf(("w "));
+		return;
+	} else	{	/* check for error */
+		if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) &&
+				(sc->sc_state & OPEN))
+			sc->sc_state |= ERROR;
+		/* lptout() will jump in and try to restart. */
+	}
+#endif
+	lprintf(("sts %x ", sts));
+}
+
+static	int
+lptioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p)
+{
+	int	error = 0;
+        struct	lpt_softc *sc;
+        u_int	unit = LPTUNIT(minor(dev));
+	u_char	old_sc_irq;	/* old printer IRQ status */
+
+        sc = lpt_sc + unit;
+
+	switch (cmd) {
+	case LPT_IRQ :
+		if(sc->sc_irq & LP_HAS_IRQ) {
+			/*
+			 * NOTE:
+			 * If the IRQ status is changed,
+			 * this will only be visible on the
+			 * next open.
+			 *
+			 * If interrupt status changes,
+			 * this gets syslog'd.
+			 */
+			old_sc_irq = sc->sc_irq;
+			if(*(int*)data == 0)
+				sc->sc_irq &= (~LP_ENABLE_IRQ);
+			else
+				sc->sc_irq |= LP_ENABLE_IRQ;
+			if (old_sc_irq != sc->sc_irq )
+				log(LOG_NOTICE, "lpt%c switched to %s mode\n",
+					(char)unit+'0',
+					(sc->sc_irq & LP_ENABLE_IRQ)?
+					"interrupt-driven":"polled");
+		} else /* polled port */
+			error = EOPNOTSUPP;
+		break;
+	default:
+		error = ENODEV;
+	}
+
+	return(error);
+}
+
+#ifdef INET
+
+static void
+lpattach (struct lpt_softc *sc, int unit)
+{
+	struct ifnet *ifp = &sc->sc_if;
+
+	ifp->if_softc = sc;
+	ifp->if_name = "lp";
+	ifp->if_unit = unit;
+	ifp->if_mtu = LPMTU;
+	ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST;
+	ifp->if_ioctl = lpioctl;
+	ifp->if_output = lpoutput;
+	ifp->if_type = IFT_PARA;
+	ifp->if_hdrlen = 0;
+	ifp->if_addrlen = 0;
+	ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
+	if_attach(ifp);
+	printf("lp%d: TCP/IP capable interface\n", unit);
+
+#if NBPFILTER > 0
+	bpfattach(ifp, DLT_NULL, LPIPHDRLEN);
+#endif
+}
+
+#ifndef PC98
+/*
+ * Build the translation tables for the LPIP (BSD unix) protocol.
+ * We don't want to calculate these nasties in our tight loop, so we
+ * precalculate them when we initialize.
+ */
+static int
+lpinittables (void)
+{
+    int i;
+
+    if (!txmith)
+	txmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_NOWAIT);
+
+    if (!txmith)
+	return 1;
+
+    if (!ctxmith)
+	ctxmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_NOWAIT);
+
+    if (!ctxmith)
+	return 1;
+
+    for (i=0; i < LPIPTBLSIZE; i++) {
+	ctxmith[i] = (i & 0xF0) >> 4;
+	ctxmitl[i] = 0x10 | (i & 0x0F);
+	ctrecvh[i] = (i & 0x78) << 1;
+	ctrecvl[i] = (i & 0x78) >> 3;
+    }
+
+    for (i=0; i < LPIPTBLSIZE; i++) {
+	txmith[i] = ((i & 0x80) >> 3) | ((i & 0x70) >> 4) | 0x08;
+	txmitl[i] = ((i & 0x08) << 1) | (i & 0x07);
+	trecvh[i] = ((~i) & 0x80) | ((i & 0x38) << 1);
+	trecvl[i] = (((~i) & 0x80) >> 4) | ((i & 0x38) >> 3);
+    }
+
+    return 0;
+}
+#endif /* PC98 */
+
+/*
+ * Process an ioctl request.
+ */
+
+static int
+lpioctl (struct ifnet *ifp, u_long cmd, caddr_t data)
+{
+    struct lpt_softc *sc = lpt_sc + ifp->if_unit;
+    struct ifaddr *ifa = (struct ifaddr *)data;
+    struct ifreq *ifr = (struct ifreq *)data;
+    u_char *ptr;
+
+    switch (cmd) {
+
+    case SIOCSIFDSTADDR:
+    case SIOCAIFADDR:
+    case SIOCSIFADDR:
+	if (ifa->ifa_addr->sa_family != AF_INET)
+	    return EAFNOSUPPORT;
+	ifp->if_flags |= IFF_UP;
+	/* FALLTHROUGH */
+    case SIOCSIFFLAGS:
+	if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) {
+	    outb(sc->sc_port + lpt_control, 0x00);
+	    ifp->if_flags &= ~IFF_RUNNING;
+	    break;
+	}
+#ifdef PC98
+	/* XXX */
+	return ENOBUFS;
+#else
+	if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) {
+	    if (lpinittables())
+		return ENOBUFS;
+	    sc->sc_ifbuf = malloc(sc->sc_if.if_mtu + MLPIPHDRLEN,
+				  M_DEVBUF, M_WAITOK);
+	    if (!sc->sc_ifbuf)
+		return ENOBUFS;
+
+	    outb(sc->sc_port + lpt_control, LPC_ENA);
+	    ifp->if_flags |= IFF_RUNNING;
+	}
+	break;
+#endif
+    case SIOCSIFMTU:
+	ptr = sc->sc_ifbuf;
+	sc->sc_ifbuf = malloc(ifr->ifr_mtu+MLPIPHDRLEN, M_DEVBUF, M_NOWAIT);
+	if (!sc->sc_ifbuf) {
+	    sc->sc_ifbuf = ptr;
+	    return ENOBUFS;
+	}
+	if (ptr)
+	    free(ptr,M_DEVBUF);
+	sc->sc_if.if_mtu = ifr->ifr_mtu;
+	break;
+
+    case SIOCGIFMTU:
+	ifr->ifr_mtu = sc->sc_if.if_mtu;
+	break;
+
+    case SIOCADDMULTI:
+    case SIOCDELMULTI:
+	if (ifr == 0) {
+	    return EAFNOSUPPORT;		/* XXX */
+	}
+	switch (ifr->ifr_addr.sa_family) {
+
+#ifdef INET
+	case AF_INET:
+	    break;
+#endif
+
+	default:
+	    return EAFNOSUPPORT;
+	}
+	break;
+
+    default:
+	lprintf(("LP:ioctl(0x%lx)\n", cmd));
+	return EINVAL;
+    }
+    return 0;
+}
+
+static __inline int
+clpoutbyte (u_char byte, int spin, int data_port, int status_port)
+{
+	outb(data_port, ctxmitl[byte]);
+	while (inb(status_port) & CLPIP_SHAKE)
+		if (--spin == 0) {
+			return 1;
+		}
+	outb(data_port, ctxmith[byte]);
+	while (!(inb(status_port) & CLPIP_SHAKE))
+		if (--spin == 0) {
+			return 1;
+		}
+	return 0;
+}
+
+static __inline int
+clpinbyte (int spin, int data_port, int status_port)
+{
+	int c, cl;
+
+	while((inb(status_port) & CLPIP_SHAKE))
+	    if(!--spin) {
+		return -1;
+	    }
+	cl = inb(status_port);
+	outb(data_port, 0x10);
+
+	while(!(inb(status_port) & CLPIP_SHAKE))
+	    if(!--spin) {
+		return -1;
+	    }
+	c = inb(status_port);
+	outb(data_port, 0x00);
+
+	return (ctrecvl[cl] | ctrecvh[c]);
+}
+
+static void
+lpintr (int unit)
+{
+	struct   lpt_softc *sc = lpt_sc + unit;
+	register int lpt_data_port = sc->sc_port + lpt_data;
+	register int lpt_stat_port = sc->sc_port + lpt_status;
+		 int lpt_ctrl_port = sc->sc_port + lpt_control;
+	int len, s, j;
+	u_char *bp;
+	u_char c, cl;
+	struct mbuf *top;
+
+	s = splhigh();
+
+	if (sc->sc_if.if_flags & IFF_LINK0) {
+
+	    /* Ack. the request */
+	    outb(lpt_data_port, 0x01);
+
+	    /* Get the packet length */
+	    j = clpinbyte(LPMAXSPIN2, lpt_data_port, lpt_stat_port);
+	    if (j == -1)
+		goto err;
+	    len = j;
+	    j = clpinbyte(LPMAXSPIN2, lpt_data_port, lpt_stat_port);
+	    if (j == -1)
+		goto err;
+	    len = len + (j << 8);
+	    if (len > sc->sc_if.if_mtu + MLPIPHDRLEN)
+		goto err;
+
+	    bp  = sc->sc_ifbuf;
+	
+	    while (len--) {
+	        j = clpinbyte(LPMAXSPIN2, lpt_data_port, lpt_stat_port);
+	        if (j == -1) {
+		    goto err;
+	        }
+	        *bp++ = j;
+	    }
+	    /* Get and ignore checksum */
+	    j = clpinbyte(LPMAXSPIN2, lpt_data_port, lpt_stat_port);
+	    if (j == -1) {
+	        goto err;
+	    }
+
+	    len = bp - sc->sc_ifbuf;
+	    if (len <= CLPIPHDRLEN)
+	        goto err;
+
+	    sc->sc_iferrs = 0;
+
+	    if (IF_QFULL(&ipintrq)) {
+	        lprintf(("DROP"));
+	        IF_DROP(&ipintrq);
+		goto done;
+	    }
+	    len -= CLPIPHDRLEN;
+	    sc->sc_if.if_ipackets++;
+	    sc->sc_if.if_ibytes += len;
+	    top = m_devget(sc->sc_ifbuf + CLPIPHDRLEN, len, 0, &sc->sc_if, 0);
+	    if (top) {
+	        IF_ENQUEUE(&ipintrq, top);
+	        schednetisr(NETISR_IP);
+	    }
+	    goto done;
+	}
+	while ((inb(lpt_stat_port) & LPIP_SHAKE)) {
+	    len = sc->sc_if.if_mtu + LPIPHDRLEN;
+	    bp  = sc->sc_ifbuf;
+	    while (len--) {
+
+		cl = inb(lpt_stat_port);
+		outb(lpt_data_port, 8);
+
+		j = LPMAXSPIN2;
+		while((inb(lpt_stat_port) & LPIP_SHAKE))
+		    if(!--j) goto err;
+
+		c = inb(lpt_stat_port);
+		outb(lpt_data_port, 0);
+
+		*bp++= trecvh[cl] | trecvl[c];
+
+		j = LPMAXSPIN2;
+		while (!((cl=inb(lpt_stat_port)) & LPIP_SHAKE)) {
+		    if (cl != c &&
+			(((cl = inb(lpt_stat_port)) ^ 0xb8) & 0xf8) ==
+			  (c & 0xf8))
+			goto end;
+		    if (!--j) goto err;
+		}
+	    }
+
+	end:
+	    len = bp - sc->sc_ifbuf;
+	    if (len <= LPIPHDRLEN)
+		goto err;
+
+	    sc->sc_iferrs = 0;
+
+	    if (IF_QFULL(&ipintrq)) {
+		lprintf(("DROP"));
+		IF_DROP(&ipintrq);
+		goto done;
+	    }
+#if NBPFILTER > 0
+	    if (sc->sc_if.if_bpf) {
+		bpf_tap(&sc->sc_if, sc->sc_ifbuf, len);
+	    }
+#endif
+	    len -= LPIPHDRLEN;
+	    sc->sc_if.if_ipackets++;
+	    sc->sc_if.if_ibytes += len;
+	    top = m_devget(sc->sc_ifbuf + LPIPHDRLEN, len, 0, &sc->sc_if, 0);
+	    if (top) {
+		    IF_ENQUEUE(&ipintrq, top);
+		    schednetisr(NETISR_IP);
+	    }
+	}
+	goto done;
+
+    err:
+	outb(lpt_data_port, 0);
+	lprintf(("R"));
+	sc->sc_if.if_ierrors++;
+	sc->sc_iferrs++;
+
+	/*
+	 * We are not able to send receive anything for now,
+	 * so stop wasting our time
+	 */
+	if (sc->sc_iferrs > LPMAXERRS) {
+	    printf("lp%d: Too many errors, Going off-line.\n", unit);
+	    outb(lpt_ctrl_port, 0x00);
+	    sc->sc_if.if_flags &= ~IFF_RUNNING;
+	    sc->sc_iferrs=0;
+	}
+
+    done:
+	splx(s);
+	return;
+}
+
+static __inline int
+lpoutbyte (u_char byte, int spin, int data_port, int status_port)
+{
+    outb(data_port, txmith[byte]);
+    while (!(inb(status_port) & LPIP_SHAKE))
+	if (--spin == 0)
+		return 1;
+    outb(data_port, txmitl[byte]);
+    while (inb(status_port) & LPIP_SHAKE)
+	if (--spin == 0)
+		return 1;
+    return 0;
+}
+
+static int
+lpoutput (struct ifnet *ifp, struct mbuf *m,
+	  struct sockaddr *dst, struct rtentry *rt)
+{
+    register int lpt_data_port = lpt_sc[ifp->if_unit].sc_port + lpt_data;
+    register int lpt_stat_port = lpt_sc[ifp->if_unit].sc_port + lpt_status;
+#ifndef PC98
+	     int lpt_ctrl_port = lpt_sc[ifp->if_unit].sc_port + lpt_control;
+#endif
+
+    int s, err;
+    struct mbuf *mm;
+    u_char *cp = "\0\0";
+    u_char chksum = 0;
+    int count = 0;
+    int i;
+    int spin;
+
+    /* We need a sensible value if we abort */
+    cp++;
+    ifp->if_flags |= IFF_RUNNING;
+
+    err = 1;			/* assume we're aborting because of an error */
+
+    s = splhigh();
+
+#ifndef PC98
+    /* Suspend (on laptops) or receive-errors might have taken us offline */
+    outb(lpt_ctrl_port, LPC_ENA);
+#endif
+
+    if (ifp->if_flags & IFF_LINK0) {
+
+	if (!(inb(lpt_stat_port) & CLPIP_SHAKE)) {
+	    lprintf(("&"));
+	    lptintr(ifp->if_unit);
+	}
+
+	/* Alert other end to pending packet */
+	spin = LPMAXSPIN1;
+	outb(lpt_data_port, 0x08);
+	while ((inb(lpt_stat_port) & 0x08) == 0)
+		if (--spin == 0) {
+			goto nend;
+		}
+
+	/* Calculate length of packet, then send that */
+
+	count += 14;		/* Ethernet header len */
+
+	mm = m;
+	for (mm = m; mm; mm = mm->m_next) {
+		count += mm->m_len;
+	}
+	if (clpoutbyte(count & 0xFF, LPMAXSPIN1, lpt_data_port, lpt_stat_port))
+		goto nend;
+	if (clpoutbyte((count >> 8) & 0xFF, LPMAXSPIN1, lpt_data_port, lpt_stat_port))
+		goto nend;
+
+	/* Send dummy ethernet header */
+	for (i = 0; i < 12; i++) {
+		if (clpoutbyte(i, LPMAXSPIN1, lpt_data_port, lpt_stat_port))
+			goto nend;
+		chksum += i;
+	}
+
+	if (clpoutbyte(0x08, LPMAXSPIN1, lpt_data_port, lpt_stat_port))
+		goto nend;
+	if (clpoutbyte(0x00, LPMAXSPIN1, lpt_data_port, lpt_stat_port))
+		goto nend;
+	chksum += 0x08 + 0x00;		/* Add into checksum */
+
+	mm = m;
+	do {
+		cp = mtod(mm, u_char *);
+		while (mm->m_len--) {
+			chksum += *cp;
+			if (clpoutbyte(*cp++, LPMAXSPIN2, lpt_data_port, lpt_stat_port))
+				goto nend;
+		}
+	} while ((mm = mm->m_next));
+
+	/* Send checksum */
+	if (clpoutbyte(chksum, LPMAXSPIN2, lpt_data_port, lpt_stat_port))
+		goto nend;
+
+	/* Go quiescent */
+	outb(lpt_data_port, 0);
+
+	err = 0;			/* No errors */
+
+	nend:
+	if (err)  {				/* if we didn't timeout... */
+		ifp->if_oerrors++;
+		lprintf(("X"));
+	} else {
+		ifp->if_opackets++;
+		ifp->if_obytes += m->m_pkthdr.len;
+	}
+
+	m_freem(m);
+
+	if (!(inb(lpt_stat_port) & CLPIP_SHAKE)) {
+		lprintf(("^"));
+		lptintr(ifp->if_unit);
+	}
+	(void) splx(s);
+	return 0;
+    }
+
+    if (inb(lpt_stat_port) & LPIP_SHAKE) {
+        lprintf(("&"));
+        lptintr(ifp->if_unit);
+    }
+
+    if (lpoutbyte(0x08, LPMAXSPIN1, lpt_data_port, lpt_stat_port))
+        goto end;
+    if (lpoutbyte(0x00, LPMAXSPIN2, lpt_data_port, lpt_stat_port))
+        goto end;
+
+    mm = m;
+    do {
+        cp = mtod(mm,u_char *);
+        while (mm->m_len--)
+	    if (lpoutbyte(*cp++, LPMAXSPIN2, lpt_data_port, lpt_stat_port))
+	        goto end;
+    } while ((mm = mm->m_next));
+
+    err = 0;				/* no errors were encountered */
+
+    end:
+    --cp;
+    outb(lpt_data_port, txmitl[*cp] ^ 0x17);
+
+    if (err)  {				/* if we didn't timeout... */
+	ifp->if_oerrors++;
+        lprintf(("X"));
+    } else {
+	ifp->if_opackets++;
+	ifp->if_obytes += m->m_pkthdr.len;
+#if NBPFILTER > 0
+	if (ifp->if_bpf) {
+	    /*
+	     * We need to prepend the packet type as
+	     * a two byte field.  Cons up a dummy header
+	     * to pacify bpf.  This is safe because bpf
+	     * will only read from the mbuf (i.e., it won't
+	     * try to free it or keep a pointer to it).
+	     */
+	    struct mbuf m0;
+	    u_short hdr = 0x800;
+
+	    m0.m_next = m;
+	    m0.m_len = 2;
+	    m0.m_data = (char *)&hdr;
+
+	    bpf_mtap(ifp, &m0);
+	}
+#endif
+    }
+
+    m_freem(m);
+
+    if (inb(lpt_stat_port) & LPIP_SHAKE) {
+	lprintf(("^"));
+	lptintr(ifp->if_unit);
+    }
+
+    (void) splx(s);
+    return 0;
+}
+
+#endif /* INET */
+
+static int lpt_devsw_installed;
+
+static void 	lpt_drvinit(void *unused)
+{
+
+	if( ! lpt_devsw_installed ) {
+		cdevsw_add(&lpt_cdevsw);
+		lpt_devsw_installed = 1;
+    	}
+}
+
+SYSINIT(lptdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,lpt_drvinit,NULL)
+