Add PC-Card/ISA SCSI host adpater drivers from NetBSD/pc98

(a NetBSD port for NEC PC-98x1 machines). They are ncv for NCR 53C500,
nsp for Workbit Ninja SCSI-3, and stg for TMC 18C30 and 18C50.

I thank NetBSD/pc98 and bsd-nomads people.

Obtained from:	NetBSD/pc98

5 files changed, 3490 insertions, 0 deletions

diff --git a/sys/cam/scsi/scsi_dvcfg.h b/sys/cam/scsi/scsi_dvcfg.h
new file mode 100644
index 0000000..b963e5d
--- /dev/null
+++ b/sys/cam/scsi/scsi_dvcfg.h
@@ -0,0 +1,58 @@
+/*	$FreeBSD$	*/
+/*	$NecBSD: scsi_dvcfg.h,v 1.4 1998/03/14 07:05:06 kmatsuda Exp $	*/
+/*	$NetBSD$	*/
+
+/*
+ * [NetBSD for NEC PC-98 series]
+ *  Copyright (c) 1994, 1995, 1996, 1997, 1998
+ *	NetBSD/pc98 porting staff. All rights reserved.
+ *  Copyright (c) 1994, 1995, 1996, 1997, 1998
+ *	Naofumi HONDA. 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. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ */
+
+#ifndef	_SCSI_DVCFG_H_
+#define	_SCSI_DVCFG_H_
+
+/* common dvcfg flags defitions for bs, ncv, stg */
+
+#define	DVF_SCSI_SYNC		0x01
+#define	DVF_SCSI_DISC		0x02
+#define	DVF_SCSI_WAIT		0x04
+#define	DVF_SCSI_LINK		0x08
+#define	DVF_SCSI_QTAG		0x10
+#define	DVF_SCSI_SP0		0x100
+#define	DVF_SCSI_NOPARITY	0x200
+#define	DVF_SCSI_SAVESP		0x400
+#define	DVF_SCSI_SP1		0x800
+#define	DVF_SCSI_PERIOD(XXX)	(((XXX) >> 24) & 0xff)
+#define	DVF_SCSI_OFFSET(XXX)	(((XXX) >> 16) & 0xff)
+#define DVF_SCSI_SYNCMASK	0xffff0000
+
+#define	DVF_SCSI_DEFCFG	(DVF_SCSI_SYNC | DVF_SCSI_NOPARITY | DVF_SCSI_SYNCMASK)
+
+#define	DVF_SCSI_BITS		"\020\13fssp\12noparity\11nosat\005qtag\004cmdlnk\003wait\002disc\001sync"
+
+#endif	/* !_SCSI_DVCFG_H_ */
diff --git a/sys/cam/scsi/scsi_low.c b/sys/cam/scsi/scsi_low.c
new file mode 100644
index 0000000..1d0a01d
--- /dev/null
+++ b/sys/cam/scsi/scsi_low.c
@@ -0,0 +1,2590 @@
+/*	$FreeBSD$	*/
+/*	$NecBSD: scsi_low.c,v 1.24 1999/07/26 06:27:01 honda Exp $	*/
+/*	$NetBSD$	*/
+
+#define	SCSI_LOW_STATICS
+#define SCSI_LOW_WARNINGS
+#ifdef __NetBSD__
+#define	SCSI_LOW_TARGET_OPEN
+#define SCSI_LOW_INFORM
+#endif
+#ifdef __FreeBSD__
+#define CAM
+#endif
+
+/*
+ * [NetBSD for NEC PC-98 series]
+ *  Copyright (c) 1995, 1996, 1997, 1998, 1999
+ *	NetBSD/pc98 porting staff. All rights reserved.
+ *  Copyright (c) 1995, 1996, 1997, 1998, 1999
+ *	Naofumi HONDA. 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. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ */
+
+/* <On the nexus establishment>
+ * When our host is reselected, 
+ * nexus establish processes are little complicated.
+ * Normal steps are followings:
+ * 1) Our host selected by target => target nexus (slp->sl_nexus) 
+ * 2) Identify msgin => lun nexus (ti->ti_li)
+ * 3) Qtag msg => slccb nexus (ti->ti_nexus)
+ */
+#include "opt_ddb.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/disklabel.h>
+#if defined(__FreeBSD__) && __FreeBSD_version >= 500001
+#include <sys/bio.h>
+#endif
+#include <sys/buf.h>
+#include <sys/queue.h>
+#include <sys/malloc.h>
+#include <sys/device_port.h>
+#include <sys/errno.h>
+
+#include <vm/vm.h>
+
+#include <machine/bus.h>
+#ifdef __NetBSD__
+#include <machine/intr.h>
+#endif
+#include <machine/dvcfg.h>
+
+#ifdef __NetBSD__
+#include <dev/cons.h>
+
+#include <dev/scsipi/scsipi_all.h>
+#include <dev/scsipi/scsipiconf.h>
+#include <dev/scsipi/scsipi_disk.h>
+#include <dev/scsipi/scsi_all.h>
+#include <dev/scsipi/scsiconf.h>
+
+#include <i386/Cbus/dev/scsi_low.h>
+#endif
+#ifdef __FreeBSD__
+#include <cam/cam.h>
+#include <cam/cam_ccb.h>
+#include <cam/cam_sim.h>
+#include <cam/cam_xpt_sim.h>
+#include <cam/cam_debug.h>
+#include <cam/cam_periph.h>
+
+#include <cam/scsi/scsi_all.h>
+#include <cam/scsi/scsi_message.h>
+
+#include <cam/scsi/scsi_low.h>
+
+#if !defined(__FreeBSD__) || __FreeBSD_version < 400001
+#include <i386/i386/cons.h>
+#else
+#include <sys/cons.h>
+#endif
+#include <machine/clock.h>
+#define delay(time) DELAY(time)
+
+/* from sys/dev/usb/usb_port.h 
+  XXX Change this when FreeBSD has memset
+ */
+#define memset(d, v, s)	\
+		do{			\
+		if ((v) == 0)		\
+			bzero((d), (s));	\
+		else			\
+			panic("Non zero filler for memset, cannot handle!"); \
+		} while (0)
+#endif
+
+#define	SCSI_LOW_DONE_COMPLETE	0
+#define	SCSI_LOW_DONE_RETRY	1
+
+static void scsi_low_engage __P((void *));
+static void scsi_low_info __P((struct scsi_low_softc *, struct targ_info *, u_char *));
+static void scsi_low_init_msgsys __P((struct scsi_low_softc *, struct targ_info *));
+static struct slccb *scsi_low_establish_ccb __P((struct targ_info *, struct lun_info *, scsi_low_tag_t));
+static int scsi_low_done __P((struct scsi_low_softc *, struct slccb *));
+static void scsi_low_twiddle_wait __P((void));
+static struct lun_info *scsi_low_alloc_li __P((struct targ_info *, int, int));
+static struct targ_info *scsi_low_alloc_ti __P((struct scsi_low_softc *, int));
+static void scsi_low_calcf __P((struct targ_info *, struct lun_info *));
+static struct lun_info *scsi_low_establish_lun __P((struct targ_info *, int));
+#ifndef CAM
+static void scsi_low_scsi_minphys __P((struct buf *));
+#endif
+#ifdef	SCSI_LOW_TARGET_OPEN
+static int scsi_low_target_open __P((struct scsipi_link *, struct cfdata *));
+#endif	/* SCSI_LOW_TARGET_OPEN */
+#ifdef CAM
+void scsi_low_scsi_action(struct cam_sim *sim, union ccb *ccb);
+static void scsi_low_poll (struct cam_sim *sim);
+#else
+static int scsi_low_scsi_cmd __P((struct scsipi_xfer *));
+#endif
+static void scsi_low_reset_nexus __P((struct scsi_low_softc *, int));
+static int scsi_low_init __P((struct scsi_low_softc *, u_int));
+static void scsi_low_start __P((struct scsi_low_softc *));
+static void scsi_low_free_ti __P((struct scsi_low_softc *));
+static void scsi_low_clear_ccb __P((struct slccb *));
+
+#ifdef	SCSI_LOW_STATICS
+struct scsi_low_statics {
+	int nexus_win;
+	int nexus_fail;
+	int nexus_disconnected;
+	int nexus_reselected;
+	int nexus_conflict;
+} scsi_low_statics;
+#endif	/* SCSI_LOW_STATICS */
+/**************************************************************
+ * power control
+ **************************************************************/
+static void
+scsi_low_engage(arg)
+	void *arg;
+{
+	struct scsi_low_softc *slp = arg;
+	int s = splbio();
+
+	switch (slp->sl_rstep)
+	{
+	case 0:
+		slp->sl_rstep ++;
+		(*slp->sl_funcs->scsi_low_power) (slp, SCSI_LOW_ENGAGE);
+#ifdef __FreeBSD__
+		slp->engage_ch = 
+#endif
+		timeout(scsi_low_engage, slp, 1);
+		break;
+
+	case 1:
+		slp->sl_rstep ++;
+		slp->sl_flags &= ~HW_RESUME;
+		scsi_low_start(slp);
+		break;
+
+	case 2:
+		break;
+	}
+	splx(s);
+}
+
+static int
+scsi_low_init(slp, flags)
+	struct scsi_low_softc *slp;
+	u_int flags;
+{
+
+	if ((slp->sl_flags & HW_POWERCTRL) != 0)
+	{
+#ifdef __FreeBSD__
+		untimeout(scsi_low_engage, slp, slp->engage_ch);
+#else /* NetBSD */
+		untimeout(scsi_low_engage, slp);
+#endif
+		slp->sl_flags &= ~(HW_POWDOWN | HW_RESUME);
+		slp->sl_active = 1;
+		slp->sl_powc = SCSI_LOW_POWDOWN_TC;
+	}
+
+	/* reset current nexus */
+	scsi_low_reset_nexus(slp, flags);
+	if ((slp->sl_flags & HW_INACTIVE) != 0)
+		return EBUSY;
+
+	if (flags == SCSI_LOW_RESTART_SOFT)
+		return 0;
+
+	return ((*slp->sl_funcs->scsi_low_init) (slp, flags));
+}
+
+/**************************************************************
+ * allocate lun_info
+ **************************************************************/
+static struct lun_info *
+scsi_low_alloc_li(ti, lun, alloc)
+	struct targ_info *ti;
+	int lun;
+	int alloc;
+{
+	struct scsi_low_softc *slp = ti->ti_sc;
+	struct lun_info *li;
+
+	li = LIST_FIRST(&ti->ti_litab); 
+	if (li != NULL)
+	{ 
+		if (li->li_lun == lun)
+			return li;
+
+		while ((li = LIST_NEXT(li, lun_chain)) != NULL)
+		{
+			if (li->li_lun == lun)
+			{
+				LIST_REMOVE(li, lun_chain);
+				LIST_INSERT_HEAD(&ti->ti_litab, li, lun_chain);
+				return li;
+			}
+		}
+	}
+
+	if (alloc == 0)
+		return li;
+
+	li = malloc(ti->ti_lunsize, M_DEVBUF, M_NOWAIT);
+	if (li == NULL)
+		panic("no lun info mem\n");
+
+	memset(li, 0, ti->ti_lunsize);
+	li->li_lun = lun;
+	li->li_ti = ti;
+#if	defined(SDEV_NOPARITY) && defined(SDEV_NODISC)
+	li->li_quirks = SDEV_NOPARITY | SDEV_NODISC;
+#endif	/* SDEV_NOPARITY && SDEV_NODISC */
+	li->li_cfgflags = 0xffff0000 | SCSI_LOW_SYNC;
+
+	LIST_INSERT_HEAD(&ti->ti_litab, li, lun_chain);
+
+	/* host specific structure initialization per lun */
+	(void) ((*slp->sl_funcs->scsi_low_lun_init) (slp, ti, li));
+
+	return li;
+}
+
+/**************************************************************
+ * allocate targ_info
+ **************************************************************/
+static struct targ_info *
+scsi_low_alloc_ti(slp, targ)
+	struct scsi_low_softc *slp;
+	int targ;
+{
+	struct targ_info *ti;
+
+	if (slp->sl_titab.tqh_first == NULL)
+		TAILQ_INIT(&slp->sl_titab);
+
+	ti = malloc(sizeof(struct targ_info), M_DEVBUF, M_NOWAIT);
+	if (ti == NULL)
+		panic("%s short of memory\n", slp->sl_xname);
+
+	memset(ti, 0, sizeof(struct targ_info));
+	ti->ti_id = targ;
+	ti->ti_sc = slp;
+
+	slp->sl_ti[targ] = ti;
+	TAILQ_INSERT_TAIL(&slp->sl_titab, ti, ti_chain);
+	TAILQ_INIT(&ti->ti_discq);
+	LIST_INIT(&ti->ti_litab);
+
+	return ti;
+}
+
+static void
+scsi_low_free_ti(slp)
+	struct scsi_low_softc *slp;
+{
+	struct targ_info *ti, *tib;
+	struct lun_info *li, *nli;
+
+	for (ti = slp->sl_titab.tqh_first; ti; ti = tib)
+	{
+		tib = ti->ti_chain.tqe_next;
+		for (li = LIST_FIRST(&ti->ti_litab); li != NULL; li = nli)
+		{
+			nli = LIST_NEXT(li, lun_chain);
+			free(li, M_DEVBUF);
+		}
+		free(ti, M_DEVBUF);
+	}
+}
+
+/**************************************************************
+ * timeout
+ **************************************************************/
+void
+scsi_low_timeout(arg)
+	void *arg;
+{
+	struct scsi_low_softc *slp = arg;
+	struct targ_info *ti;
+	struct slccb *cb = NULL;		/* XXX */
+	int s = splbio();
+
+	/* check */
+	if ((ti = slp->sl_nexus) != NULL && (cb = ti->ti_nexus) != NULL)
+	{
+		cb->ccb_tc -= SCSI_LOW_TIMEOUT_CHECK_INTERVAL;
+		if (cb->ccb_tc < 0)
+			goto bus_reset;
+	}
+	else if (slp->sl_disc > 0)
+	{
+		struct targ_info *ti;
+
+		for (ti = slp->sl_titab.tqh_first; ti != NULL;
+		     ti = ti->ti_chain.tqe_next)
+		{
+			for (cb = ti->ti_discq.tqh_first; cb != NULL;
+			     cb = cb->ccb_chain.tqe_next)
+			{
+				cb->ccb_tc -= SCSI_LOW_TIMEOUT_CHECK_INTERVAL;
+				if (cb->ccb_tc < 0)
+					goto bus_reset;
+			}
+		}
+	}
+	else
+	{
+		cb = slp->sl_start.tqh_first;
+		if (cb != NULL)
+		{
+			cb->ccb_tc -= SCSI_LOW_TIMEOUT_CHECK_INTERVAL;
+			if (cb->ccb_tc < 0)
+				goto bus_reset;
+		}
+		else if ((slp->sl_flags & HW_POWERCTRL) != 0)
+		{
+			if ((slp->sl_flags & (HW_POWDOWN | HW_RESUME)) != 0)
+				goto out;
+
+			if (slp->sl_active != 0)
+			{
+				slp->sl_powc = SCSI_LOW_POWDOWN_TC;
+				slp->sl_active = 0;
+				goto out;
+			}
+
+			slp->sl_powc --;
+			if (slp->sl_powc < 0)
+			{
+				slp->sl_powc = SCSI_LOW_POWDOWN_TC;
+				slp->sl_flags |= HW_POWDOWN;
+				(*slp->sl_funcs->scsi_low_power)
+						(slp, SCSI_LOW_POWDOWN);
+			}
+		}
+	}
+
+out:
+#ifdef __FreeBSD__
+	slp->timeout_ch = 
+#endif
+	timeout(scsi_low_timeout, slp, SCSI_LOW_TIMEOUT_CHECK_INTERVAL * hz);
+
+	splx(s);
+	return;
+
+bus_reset:
+	cb->ccb_error |= TIMEOUTIO;
+	scsi_low_info(slp, NULL, "scsi bus hangup. try to recover.");
+	scsi_low_init(slp, SCSI_LOW_RESTART_HARD);
+	scsi_low_start(slp);
+#ifdef __FreeBSD__
+	slp->timeout_ch = 
+#endif
+	timeout(scsi_low_timeout, slp, SCSI_LOW_TIMEOUT_CHECK_INTERVAL * hz);
+
+	splx(s);
+}
+
+/**************************************************************
+ * CCB
+ **************************************************************/
+GENERIC_CCB_STATIC_ALLOC(scsi_low, slccb)
+GENERIC_CCB(scsi_low, slccb, ccb_chain)
+
+/**************************************************************
+ * SCSI INTERFACE (XS)
+ **************************************************************/
+#define	SCSI_LOW_MINPHYS	0x10000
+
+#ifdef __NetBSD__
+struct scsipi_device scsi_low_dev = {
+	NULL,	/* Use default error handler */
+	NULL,	/* have a queue, served by this */
+	NULL,	/* have no async handler */
+	NULL,	/* Use default 'done' routine */
+};
+#endif
+
+#ifdef CAM
+static void
+scsi_low_cam_rescan_callback(struct cam_periph *periph, union ccb *ccb)
+{
+	xpt_free_path(ccb->ccb_h.path);
+	free(ccb, M_DEVBUF);
+#if defined(__FreeBSD__) && __FreeBSD_version < 400001
+	free(periph, M_DEVBUF);
+#endif
+}
+
+static void
+scsi_low_rescan_bus(struct scsi_low_softc *slp)
+{
+  	struct cam_path *path;
+	union ccb *ccb = malloc(sizeof(union ccb), M_DEVBUF, M_WAITOK);
+#if defined(__FreeBSD__) && __FreeBSD_version < 400001
+	struct cam_periph *xpt_periph = malloc(sizeof(struct cam_periph),
+					       M_DEVBUF, M_WAITOK);
+#endif
+	cam_status status;
+
+	bzero(ccb, sizeof(union ccb));
+
+	status = xpt_create_path(&path, xpt_periph,
+				 cam_sim_path(slp->sim), -1, 0);
+	if (status != CAM_REQ_CMP)
+		return;
+
+	xpt_setup_ccb(&ccb->ccb_h, path, 5);
+	ccb->ccb_h.func_code = XPT_SCAN_BUS;
+	ccb->ccb_h.cbfcnp = scsi_low_cam_rescan_callback;
+	ccb->crcn.flags = CAM_FLAG_NONE;
+	xpt_action(ccb);
+}
+#endif
+
+int
+scsi_low_attach(slp, openings, ntargs, nluns, lunsize)
+	struct scsi_low_softc *slp;
+	int openings, ntargs, nluns, lunsize;
+{
+	struct targ_info *ti;
+	struct lun_info *li;
+#ifdef CAM
+	struct cam_devq *devq;
+#else
+	struct scsipi_adapter *sap;
+#endif
+	int i, nccb;
+
+#ifdef CAM
+	OS_DEPEND(sprintf(slp->sl_xname, "%s%d",
+			  DEVPORT_DEVNAME(slp->sl_dev), DEVPORT_DEVUNIT(slp->sl_dev)));
+#else
+	OS_DEPEND(strncpy(slp->sl_xname, DEVPORT_DEVNAME(slp->sl_dev), 16));
+#endif
+	if (ntargs > SCSI_LOW_NTARGETS)
+	{
+		printf("scsi_low: %d targets are too large\n", ntargs);
+		printf("change kernel options SCSI_LOW_NTARGETS");
+	}
+
+	if (lunsize < sizeof(struct lun_info))
+		lunsize = sizeof(struct lun_info);
+
+	for (i = 0; i < ntargs; i ++)
+	{
+		ti = scsi_low_alloc_ti(slp, i);
+		ti->ti_lunsize = lunsize;
+		li = scsi_low_alloc_li(ti, 0, 1);
+	}
+
+#ifndef CAM
+	sap = malloc(sizeof(*sap), M_DEVBUF, M_NOWAIT);
+	if (sap == NULL)
+		return ENOMEM;
+
+	memset(sap, 0, sizeof(*sap));
+	sap->scsipi_cmd = scsi_low_scsi_cmd;
+	sap->scsipi_minphys = scsi_low_scsi_minphys;
+#ifdef	SCSI_LOW_TARGET_OPEN
+	sap->open_target_lu = scsi_low_target_open;
+#endif	/* SCSI_LOW_TARGET_OPEN */
+#endif
+
+	if (scsi_low_init(slp, SCSI_LOW_RESTART_HARD) != 0)
+		return EINVAL;
+
+	/* initialize queue */
+	nccb = openings * (ntargs - 1);
+	if (nccb >= SCSI_LOW_NCCB || nccb <= 0)
+		nccb = SCSI_LOW_NCCB;
+	scsi_low_init_ccbque(nccb);
+	TAILQ_INIT(&slp->sl_start);
+
+	slp->sl_openings = openings;
+	slp->sl_ntargs = ntargs;
+	slp->sl_nluns = nluns;
+
+#ifdef CAM
+	/*
+	 * Prepare the scsibus_data area for the upperlevel
+	 * scsi code.
+	 */
+	devq = cam_simq_alloc(256/*MAX_START*/);
+	if (devq == NULL)
+		return (0);
+	/*	scbus->adapter_link = &slp->sc_link; */
+	/*
+	 * ask the adapter what subunits are present
+	 */
+	
+	slp->sim = cam_sim_alloc(scsi_low_scsi_action, scsi_low_poll,
+				 DEVPORT_DEVNAME(slp->sl_dev), slp,
+				 DEVPORT_DEVUNIT(slp->sl_dev), 1, 32/*MAX_TAGS*/, devq);
+       if (slp->sim == NULL) {
+	 cam_simq_free(devq);
+	 return 0;
+       }
+
+       if (xpt_bus_register(slp->sim, 0) != CAM_SUCCESS) {
+	 free(slp->sim, M_DEVBUF);
+	 return 0;
+       }
+       
+       if (xpt_create_path(&slp->path, /*periph*/NULL,
+                           cam_sim_path(slp->sim), CAM_TARGET_WILDCARD,
+			   CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
+	 xpt_bus_deregister(cam_sim_path(slp->sim));
+	 cam_sim_free(slp->sim, /*free_simq*/TRUE);
+	 free(slp->sim, M_DEVBUF);
+	 return 0;
+       }
+#else /* !CAM */
+	slp->sl_link.adapter_softc = slp;
+	slp->sl_link.scsipi_scsi.adapter_target = slp->sl_hostid;
+	slp->sl_link.scsipi_scsi.max_target = ntargs - 1;
+	slp->sl_link.scsipi_scsi.max_lun = nluns - 1;
+	slp->sl_link.scsipi_scsi.channel = SCSI_CHANNEL_ONLY_ONE;
+	slp->sl_link.openings = openings;
+	slp->sl_link.type = BUS_SCSI;
+	slp->sl_link.adapter_softc = slp;
+	slp->sl_link.adapter = sap;
+	slp->sl_link.device = &scsi_low_dev;
+#endif
+
+	/* start watch dog */
+	slp->sl_max_retry = SCSI_LOW_MAX_RETRY;
+#ifdef __FreeBSD__
+	slp->timeout_ch = 
+#endif
+	timeout(scsi_low_timeout, slp, SCSI_LOW_TIMEOUT_CHECK_INTERVAL * hz);
+#ifdef CAM
+	if (!cold)
+		scsi_low_rescan_bus(slp);
+#endif
+
+	return 0;
+}
+
+#ifndef CAM
+static void
+scsi_low_scsi_minphys(bp)
+	struct buf *bp;
+{
+
+	if (bp->b_bcount > SCSI_LOW_MINPHYS)
+		bp->b_bcount = SCSI_LOW_MINPHYS;
+	minphys(bp);
+}
+#endif
+
+int
+scsi_low_dettach(slp)
+	struct scsi_low_softc *slp;
+{
+
+	if (slp->sl_disc > 0 || slp->sl_start.tqh_first != NULL)
+		return EBUSY;
+
+	/*
+	 * scsipi does not have dettach bus fucntion.
+	 *
+	scsipi_dettach_scsibus(&slp->sl_link);
+	*/
+
+#ifdef CAM
+	xpt_async(AC_LOST_DEVICE, slp->path, NULL);
+	xpt_free_path(slp->path);
+	xpt_bus_deregister(cam_sim_path(slp->sim));
+	cam_sim_free(slp->sim, /* free_devq */ TRUE);
+#endif
+
+	scsi_low_free_ti(slp);
+	return 0;
+}
+
+#ifdef CAM
+static void
+scsi_low_poll(struct cam_sim *sim)
+{
+	struct scsi_low_softc *slp = (struct scsi_low_softc *) cam_sim_softc(sim);
+	(*slp->sl_funcs->scsi_low_poll) (slp);
+}
+
+void
+scsi_low_scsi_action(struct cam_sim *sim, union ccb *ccb)
+{
+	struct scsi_low_softc *slp = (struct scsi_low_softc *) cam_sim_softc(sim);
+	int s, target = (u_int) (ccb->ccb_h.target_id);
+	struct targ_info *ti;
+	struct lun_info *li;
+	struct slccb *cb;
+
+#if 0
+	printf("scsi_low_scsi_action() func code %d Target: %d, LUN: %d\n",
+	       ccb->ccb_h.func_code, target, ccb->ccb_h.target_lun);
+#endif
+	switch (ccb->ccb_h.func_code) {
+	case XPT_SCSI_IO:	/* Execute the requested I/O operation */
+		if (((cb = scsi_low_get_ccb()) == NULL)) {
+			ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
+			xpt_done(ccb);
+			return;
+		}
+
+		cb->ccb = ccb;
+		cb->ccb_tag = SCSI_LOW_UNKTAG;
+		cb->bp = (struct buf *)NULL;
+		cb->ti = ti = slp->sl_ti[target];
+		cb->li = scsi_low_alloc_li(ti, ccb->ccb_h.target_lun, 1);
+		cb->ccb_flags = 0;
+		cb->ccb_rcnt = 0;
+
+		s = splcam();
+
+		TAILQ_INSERT_TAIL(&slp->sl_start, cb, ccb_chain);
+
+		if (slp->sl_nexus == NULL) {
+			scsi_low_start(slp);
+		}
+
+		splx(s);
+		break;
+	case XPT_RESET_DEV:	/* Bus Device Reset the specified SCSI device */
+	case XPT_EN_LUN:		/* Enable LUN as a target */
+	case XPT_TARGET_IO:		/* Execute target I/O request */
+	case XPT_ACCEPT_TARGET_IO:	/* Accept Host Target Mode CDB */
+	case XPT_CONT_TARGET_IO:	/* Continue Host Target I/O Connection*/
+	case XPT_ABORT:			/* Abort the specified CCB */
+		/* XXX Implement */
+		ccb->ccb_h.status = CAM_REQ_INVALID;
+		xpt_done(ccb);
+		break;
+	case XPT_SET_TRAN_SETTINGS:
+		/* XXX Implement */
+		ccb->ccb_h.status = CAM_FUNC_NOTAVAIL;
+		xpt_done(ccb);
+		break;
+	case XPT_GET_TRAN_SETTINGS: {
+		struct ccb_trans_settings *cts;
+		struct targ_info *ti;
+		int lun = ccb->ccb_h.target_lun;
+		/*int s;*/
+
+		cts = &ccb->cts;
+		ti = slp->sl_ti[ccb->ccb_h.target_id];
+		li = LIST_FIRST(&ti->ti_litab); 
+		if (li != NULL && li->li_lun != lun)
+			while ((li = LIST_NEXT(li, lun_chain)) != NULL)
+				if (li->li_lun == lun)
+					break;
+		s = splcam();
+		if (li != NULL && (cts->flags & CCB_TRANS_USER_SETTINGS) != 0) {
+			if (li->li_cfgflags & SCSI_LOW_DISC)
+				cts->flags = CCB_TRANS_DISC_ENB;
+			else
+				cts->flags = 0;
+			if (li->li_cfgflags & SCSI_LOW_QTAG)
+				cts->flags |= CCB_TRANS_TAG_ENB;
+
+			cts->bus_width = 0;/*HN2*/
+
+			cts->valid = CCB_TRANS_SYNC_RATE_VALID
+				   | CCB_TRANS_SYNC_OFFSET_VALID
+				   | CCB_TRANS_BUS_WIDTH_VALID
+				   | CCB_TRANS_DISC_VALID
+				   | CCB_TRANS_TQ_VALID;
+			ccb->ccb_h.status = CAM_REQ_CMP;
+		} else
+			ccb->ccb_h.status = CAM_FUNC_NOTAVAIL;
+
+		splx(s);
+		xpt_done(ccb);
+		break;
+	}
+	case XPT_CALC_GEOMETRY: { /* not yet HN2 */
+		struct	  ccb_calc_geometry *ccg;
+		u_int32_t size_mb;
+		u_int32_t secs_per_cylinder;
+		int       extended;
+
+		extended = 1;
+		ccg = &ccb->ccg;
+		size_mb = ccg->volume_size
+			/ ((1024L * 1024L) / ccg->block_size);
+		
+		if (size_mb > 1024 && extended) {
+		        ccg->heads = 255;
+		        ccg->secs_per_track = 63;
+		} else {
+		        ccg->heads = 64;
+		        ccg->secs_per_track = 32;
+		}
+		secs_per_cylinder = ccg->heads * ccg->secs_per_track;
+		ccg->cylinders = ccg->volume_size / secs_per_cylinder;
+		ccb->ccb_h.status = CAM_REQ_CMP;
+		xpt_done(ccb);
+		break;
+	}
+	case XPT_RESET_BUS:		/* Reset the specified SCSI bus */
+#if 0
+	  	scsi_low_bus_reset(slp);
+#endif
+		ccb->ccb_h.status = CAM_REQ_CMP;
+		xpt_done(ccb);
+		break;
+	case XPT_TERM_IO:		/* Terminate the I/O process */
+		/* XXX Implement */
+		ccb->ccb_h.status = CAM_REQ_INVALID;
+		xpt_done(ccb);
+		break;
+	case XPT_PATH_INQ: {		/* Path routing inquiry */
+		struct ccb_pathinq *cpi = &ccb->cpi;
+		
+		cpi->version_num = 1; /* XXX??? */
+		cpi->hba_inquiry = PI_SDTR_ABLE;
+		cpi->target_sprt = 0;
+		cpi->hba_misc = 0;
+		cpi->hba_eng_cnt = 0;
+		cpi->max_target = SCSI_LOW_NTARGETS - 1;
+		cpi->max_lun = 7;
+		cpi->initiator_id = 7; /* HOST_SCSI_ID */
+		cpi->bus_id = cam_sim_bus(sim);
+		cpi->base_transfer_speed = 3300;
+		strncpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
+		strncpy(cpi->hba_vid, "SCSI_LOW", HBA_IDLEN);
+		strncpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN);
+		cpi->unit_number = cam_sim_unit(sim);
+		cpi->ccb_h.status = CAM_REQ_CMP;
+		xpt_done(ccb);
+		break;
+	}
+	default:
+	        printf("scsi_low: non support func_code = %d ", ccb->ccb_h.func_code);
+		ccb->ccb_h.status = CAM_REQ_INVALID;
+		xpt_done(ccb);
+		break;
+	}
+}
+#else /* !CAM */
+static int
+scsi_low_scsi_cmd(xs)
+	struct scsipi_xfer *xs;
+{
+	struct scsi_low_softc *slp = xs->sc_link->adapter_softc;
+	struct targ_info *ti;
+	struct slccb *cb;
+	int s, lun, timeo;
+
+	if (slp->sl_cfgflags & CFG_NOATTEN)
+	{
+		if (xs->sc_link->scsipi_scsi.lun > 0)
+		{
+			xs->error = XS_DRIVER_STUFFUP;
+			return COMPLETE;
+		}
+	}
+
+	if ((cb = scsi_low_get_ccb(xs->flags & SCSI_NOSLEEP)) == NULL)
+		return TRY_AGAIN_LATER;
+
+	lun = xs->sc_link->scsipi_scsi.lun;
+	cb->xs = xs;
+	cb->ccb_tag = SCSI_LOW_UNKTAG;
+	cb->ti = ti = slp->sl_ti[xs->sc_link->scsipi_scsi.target];
+	cb->li = scsi_low_alloc_li(ti, lun, 1);
+	cb->ccb_flags = 0;
+	cb->ccb_rcnt = 0;
+
+	s = splbio();
+
+	TAILQ_INSERT_TAIL(&slp->sl_start, cb, ccb_chain);
+	if (slp->sl_nexus == NULL)
+		scsi_low_start(slp);
+
+	if ((xs->flags & SCSI_POLL) == 0)
+	{
+		splx(s);
+		return SUCCESSFULLY_QUEUED;
+	}
+
+#define	SCSI_LOW_POLL_INTERVAL	1000		/* 1 ms */
+	timeo = xs->timeout * (1000 / SCSI_LOW_POLL_INTERVAL);
+
+	while ((xs->flags & ITSDONE) == 0 && timeo -- > 0)
+	{
+		delay(SCSI_LOW_POLL_INTERVAL);
+		(*slp->sl_funcs->scsi_low_poll) (slp);
+	}
+
+	if ((xs->flags & ITSDONE) == 0)
+	{
+		cb->ccb_error |= (TIMEOUTIO | ABORTIO);
+		SCSI_LOW_SETUP_MSGPHASE(slp, MSGPH_NULL);
+		scsi_low_disconnected(slp, ti);
+		scsi_low_init(slp, SCSI_LOW_RESTART_HARD);
+	}
+
+	scsipi_done(xs);
+	splx(s);
+	return COMPLETE;
+}
+#endif
+
+/**************************************************************
+ * Start & Done
+ **************************************************************/
+#ifdef __NetBSD__
+static struct scsipi_start_stop ss_cmd = { START_STOP, 0, {0,0,}, SSS_START, };
+static struct scsipi_test_unit_ready unit_ready_cmd;
+#endif
+#ifdef __FreeBSD__
+static struct scsi_start_stop_unit ss_cmd = { START_STOP, 0, {0,0,}, SSS_START, };
+static struct scsi_test_unit_ready unit_ready_cmd;
+#endif
+static void scsi_low_unit_ready_cmd __P((struct slccb *));
+
+static void
+scsi_low_unit_ready_cmd(cb)
+	struct slccb *cb;
+{
+
+	cb->ccb_scp.scp_cmd = (u_int8_t *) &unit_ready_cmd;
+	cb->ccb_scp.scp_cmdlen = sizeof(unit_ready_cmd);
+	cb->ccb_scp.scp_datalen = 0;
+	cb->ccb_scp.scp_direction = SCSI_LOW_READ;
+	cb->ccb_tcmax = 15;
+}
+
+static void
+scsi_low_start(slp)
+	struct scsi_low_softc *slp;
+{
+#ifdef CAM
+        union ccb *ccb;
+#else
+	struct scsipi_xfer *xs;
+#endif
+	struct targ_info *ti;
+	struct lun_info *li;
+	struct slccb *cb;
+	int rv;
+
+	/* check hardware exists ? */
+	if ((slp->sl_flags & HW_INACTIVE) != 0)
+		return;
+
+	/* check hardware power up ? */
+	if ((slp->sl_flags & HW_POWERCTRL) != 0)
+	{
+		slp->sl_active ++;
+		if (slp->sl_flags & (HW_POWDOWN | HW_RESUME))
+		{
+			if (slp->sl_flags & HW_RESUME)
+				return;
+			slp->sl_flags &= ~HW_POWDOWN;
+			if (slp->sl_funcs->scsi_low_power != NULL)
+			{
+				slp->sl_flags |= HW_RESUME;
+				slp->sl_rstep = 0;
+				(*slp->sl_funcs->scsi_low_power)
+					(slp, SCSI_LOW_ENGAGE);
+#ifdef __FreeBSD__
+				slp->engage_ch =
+#endif
+				timeout(scsi_low_engage, slp, 1);
+				return;
+			}
+		}
+	}
+
+	/* setup nexus */
+#ifdef	SCSI_LOW_DIAGNOSTIC
+	ti = slp->sl_nexus;
+	if (ti != NULL)
+	{
+		scsi_low_info(slp, NULL, "NEXUS INCOSISTENT");
+		panic("%s: inconsistent(target)\n", slp->sl_xname);
+	}
+#endif	/* SCSI_LOW_DIAGNOSTIC */
+
+	for (cb = slp->sl_start.tqh_first; cb != NULL;
+	     cb = cb->ccb_chain.tqe_next)
+	{
+		ti = cb->ti;
+		li = cb->li;
+		if (ti->ti_phase == PH_NULL)
+			goto scsi_low_cmd_start;
+		if (ti->ti_phase == PH_DISC && li->li_disc < li->li_maxnexus)
+			goto scsi_low_cmd_start;
+	}
+	return;
+
+scsi_low_cmd_start:
+#ifdef CAM
+	ccb = cb->ccb;
+#else
+	xs = cb->xs;
+#endif
+#ifdef	SCSI_LOW_DIAGNOSTIC
+	if (ti->ti_nexus != NULL || ti->ti_li != NULL)
+	{
+		scsi_low_info(slp, NULL, "NEXUS INCOSISTENT");
+		panic("%s: inconsistent(lun or ccb)\n", slp->sl_xname);
+	}
+#endif	/* SCSI_LOW_DIAGNOSTIC */
+
+	/* clear all error flag bits (for restart) */
+	cb->ccb_error = 0;
+
+	/* setup nexus pointer */
+	ti->ti_nexus = cb;
+	ti->ti_li = li;
+	slp->sl_nexus = ti;
+
+	/* initialize msgsys */
+	scsi_low_init_msgsys(slp, ti);
+
+	/* target lun state check */
+#ifdef CAM
+		li->li_maxstate = UNIT_OK;
+#else
+	if ((xs->flags & SCSI_POLL) != 0)
+		li->li_maxstate = UNIT_NEGSTART;
+	else
+		li->li_maxstate = UNIT_OK;
+#endif
+
+	/* exec cmds */
+scsi_low_cmd_exec:
+	if ((cb->ccb_flags & CCB_SENSE) != 0)
+	{
+		memset(&cb->ccb_sense, 0, sizeof(cb->ccb_sense));
+#ifdef CAM
+#else
+		cb->ccb_sense_cmd.opcode = REQUEST_SENSE;
+		cb->ccb_sense_cmd.byte2 = (li->li_lun << 5);
+		cb->ccb_sense_cmd.length = sizeof(cb->ccb_sense);
+#endif
+		cb->ccb_scp.scp_cmd = (u_int8_t *) &cb->ccb_sense_cmd;
+		cb->ccb_scp.scp_cmdlen = sizeof(cb->ccb_sense_cmd);
+		cb->ccb_scp.scp_data = (u_int8_t *) &cb->ccb_sense;
+		cb->ccb_scp.scp_datalen = sizeof(cb->ccb_sense);
+		cb->ccb_scp.scp_direction = SCSI_LOW_READ;
+		cb->ccb_tcmax = 15;
+	}
+	else if (li->li_state >= li->li_maxstate)
+	{
+#ifdef CAM
+		cb->ccb_scp.scp_cmd = ccb->csio.cdb_io.cdb_bytes;
+		cb->ccb_scp.scp_cmdlen = (int) ccb->csio.cdb_len;
+		cb->ccb_scp.scp_data = ccb->csio.data_ptr;
+		cb->ccb_scp.scp_datalen = (int) ccb->csio.dxfer_len;
+		if((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_OUT)
+			cb->ccb_scp.scp_direction = SCSI_LOW_WRITE;
+		else /* if((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) */
+			cb->ccb_scp.scp_direction = SCSI_LOW_READ;
+		cb->ccb_tcmax = (ccb->ccb_h.timeout >> 10);
+#else
+		cb->ccb_scp.scp_cmd = (u_int8_t *) xs->cmd;
+		cb->ccb_scp.scp_cmdlen = xs->cmdlen;
+		cb->ccb_scp.scp_data = xs->data;
+		cb->ccb_scp.scp_datalen = xs->datalen;
+		cb->ccb_scp.scp_direction = (xs->flags & SCSI_DATA_OUT) ? 
+				SCSI_LOW_WRITE : SCSI_LOW_READ;
+		cb->ccb_tcmax = (xs->timeout >> 10);
+#endif
+
+	}
+	else switch(li->li_state)
+	{
+	case UNIT_SLEEP:
+		scsi_low_unit_ready_cmd(cb);
+		break;
+
+	case UNIT_START:
+		cb->ccb_scp.scp_cmd = (u_int8_t *) &ss_cmd;
+		cb->ccb_scp.scp_cmdlen = sizeof(ss_cmd);
+		cb->ccb_scp.scp_datalen = 0;
+		cb->ccb_scp.scp_direction = SCSI_LOW_READ;
+		cb->ccb_tcmax = 30;
+		break;
+
+	case UNIT_SYNCH:
+		if (li->li_maxsynch.offset > 0)
+		{
+			scsi_low_assert_msg(slp, ti, SCSI_LOW_MSG_SYNCH, 0);
+			scsi_low_unit_ready_cmd(cb);
+			break;
+		}
+		li->li_state = UNIT_WIDE;
+
+	case UNIT_WIDE:
+#ifdef	SCSI_LOW_SUPPORT_WIDE
+		if (li->li_width > 0)
+		{
+			scsi_low_assert_msg(slp, ti, SCSI_LOW_MSG_WIDE, 0);
+			scsi_low_unit_ready_cmd(cb);
+			break;
+		}
+#endif	/* SCSI_LOW_SUPPORT_WIDE */
+		li->li_state = UNIT_OK;
+
+	case UNIT_OK:
+		goto scsi_low_cmd_exec;
+	}
+
+	/* timeout */
+	if (cb->ccb_tcmax < SCSI_LOW_MIN_TOUT)
+		cb->ccb_tcmax = SCSI_LOW_MIN_TOUT;
+	cb->ccb_tc = cb->ccb_tcmax;
+
+	/* setup saved scsi data pointer */
+	cb->ccb_sscp = cb->ccb_scp;
+
+	/* setup current scsi pointer */ 
+	slp->sl_scp = cb->ccb_sscp;
+	slp->sl_error = cb->ccb_error;
+
+	/* selection start */
+	slp->sl_selid = ti;
+	rv = ((*slp->sl_funcs->scsi_low_start_bus) (slp, cb));
+	if (rv == SCSI_LOW_START_OK)
+	{
+#ifdef	SCSI_LOW_STATICS
+		scsi_low_statics.nexus_win ++;
+#endif	/* SCSI_LOW_STATICS */
+		return;
+	}
+
+#ifdef	SCSI_LOW_STATICS
+	scsi_low_statics.nexus_fail ++;
+#endif	/* SCSI_LOW_STATICS */
+	SCSI_LOW_SETUP_PHASE(ti, PH_NULL);
+	scsi_low_clear_nexus(slp, ti);
+}
+
+void
+scsi_low_clear_nexus(slp, ti)
+	struct scsi_low_softc *slp;
+	struct targ_info *ti;
+{
+
+	/* clear all nexus pointer */
+	ti->ti_nexus = NULL;
+	ti->ti_li = NULL;
+	slp->sl_nexus = NULL;
+
+	/* clear selection assert */
+	slp->sl_selid = NULL;
+
+	/* clear nexus data */
+	slp->sl_nexus_call = 0;
+	slp->sl_scp.scp_direction = SCSI_LOW_RWUNK;
+}
+
+static int
+scsi_low_done(slp, cb)
+	struct scsi_low_softc *slp;
+	struct slccb *cb;
+{
+#ifdef CAM
+	union ccb *ccb;
+#else
+	struct scsipi_xfer *xs;
+#endif
+	struct targ_info *ti;
+	struct lun_info *li;
+
+	ti = cb->ti;
+	li = cb->li;
+#ifdef CAM
+	ccb = cb->ccb;
+#else
+	xs = cb->xs;
+#endif
+	if (cb->ccb_error == 0)
+	{
+		if ((cb->ccb_flags & CCB_SENSE) != 0)
+		{
+			cb->ccb_flags &= ~CCB_SENSE;
+#ifdef CAM
+			ccb->csio.sense_data = cb->ccb_sense;
+			/* ccb->ccb_h.status = CAM_AUTOSENSE_FAIL; */
+			ccb->ccb_h.status = CAM_REQ_CMP;
+			/* ccb->ccb_h.status = CAM_AUTOSNS_VALID|CAM_SCSI_STATUS_ERROR; */
+#else
+			xs->sense.scsi_sense = cb->ccb_sense;
+			xs->error = XS_SENSE;
+#endif
+		}
+		else switch (ti->ti_status)
+		{
+		case ST_GOOD:
+			if (slp->sl_scp.scp_datalen == 0)
+			{
+#ifdef CAM
+				ccb->ccb_h.status = CAM_REQ_CMP;
+#else
+				xs->error = XS_NOERROR;
+#endif
+				break;
+			}
+
+#define	SCSIPI_SCSI_CD_COMPLETELY_BUGGY	"YES"
+#ifdef	SCSIPI_SCSI_CD_COMPLETELY_BUGGY
+#ifdef CAM
+			if (/* cb->bp == NULL &&  */
+			    slp->sl_scp.scp_datalen < cb->ccb_scp.scp_datalen)
+#else
+			if (xs->bp == NULL &&
+			    slp->sl_scp.scp_datalen < cb->ccb_scp.scp_datalen)
+#endif
+			{
+#ifdef CAM
+				ccb->ccb_h.status = CAM_REQ_CMP;
+#else
+				xs->error = XS_NOERROR;
+#endif
+				break;
+			}	
+#endif	/* SCSIPI_SCSI_CD_COMPLETELY_BUGGY */
+
+			cb->ccb_error |= PDMAERR;
+#ifdef CAM
+			ccb->ccb_h.status = CAM_REQ_CMP_ERR;
+#else
+			xs->error = XS_DRIVER_STUFFUP;
+#endif
+			break;
+
+		case ST_CHKCOND:
+		case ST_MET:
+			cb->ccb_flags |= CCB_SENSE;
+#ifdef CAM
+			ccb->ccb_h.status = CAM_AUTOSENSE_FAIL;
+#else
+			xs->error = XS_SENSE;
+#endif
+			goto retry;
+
+		case ST_BUSY:
+			cb->ccb_error |= BUSYERR;
+#ifdef CAM
+			ccb->ccb_h.status = CAM_BUSY; /* SCSI_STATUS_ERROR; */
+#else
+			xs->error = XS_BUSY;
+#endif
+			break;
+
+		default:
+			cb->ccb_error |= FATALIO;
+#ifdef CAM
+			ccb->ccb_h.status = CAM_REQ_CMP_ERR;
+#else
+			xs->error = XS_DRIVER_STUFFUP;
+#endif
+			break;
+		}
+	}
+	else
+	{
+		cb->ccb_flags &= ~CCB_SENSE;
+		if (ti->ti_phase == PH_SELSTART)
+		{
+#ifdef CAM
+			ccb->ccb_h.status = CAM_CMD_TIMEOUT;
+#else
+			xs->error = XS_TIMEOUT;
+#endif
+			slp->sl_error |= SELTIMEOUTIO;
+			if (li->li_state == UNIT_SLEEP)
+				cb->ccb_error |= ABORTIO;
+		}
+		else
+		{
+#ifdef CAM
+			ccb->ccb_h.status = CAM_REQ_CMP_ERR;
+#else
+			xs->error = XS_DRIVER_STUFFUP;
+#endif
+		}
+
+		if ((cb->ccb_error & ABORTIO) != 0)
+		{
+			cb->ccb_rcnt = slp->sl_max_retry;
+#ifdef CAM
+			ccb->ccb_h.status = CAM_REQ_ABORTED;
+#endif
+		}
+	}
+
+	/* target state check */
+	if (li->li_state < li->li_maxstate)
+	{
+		if (cb->ccb_rcnt < slp->sl_max_retry)
+		{
+			li->li_state ++;
+			cb->ccb_rcnt = 0;
+			goto retry;
+		}
+	}
+
+	/* internal retry check */
+#ifdef CAM
+	if (ccb->ccb_h.status == CAM_REQ_CMP)
+	{
+		ccb->csio.resid = 0;
+	}
+	else
+	{
+#if 0
+		if (ccb->ccb_h.status != CAM_AUTOSENSE_FAIL && 
+		    cb->ccb_rcnt < slp->sl_max_retry)
+			goto retry;
+#endif
+#else
+	if (xs->error == XS_NOERROR)
+	{
+		xs->resid = 0;
+	}
+	else
+	{
+		if (xs->error != XS_SENSE && 
+		    cb->ccb_rcnt < slp->sl_max_retry)
+			goto retry;
+#endif
+
+#ifndef CAM
+#ifdef SCSI_LOW_WARNINGS
+		if (xs->bp != NULL)
+		{
+			scsi_low_print(slp, ti);
+			printf("%s: WARNING: File system IO abort\n",
+				slp->sl_xname);
+		}
+#endif	/* SCSI_LOW_WARNINGS */
+#endif
+	}
+
+#ifdef CAM
+	ccb->csio.scsi_status = ti->ti_status;
+	xpt_done(ccb);
+#else
+	xs->flags |= ITSDONE;
+	if ((xs->flags & SCSI_POLL) == 0)
+		scsipi_done(xs);
+#endif
+
+	/* free our target */
+	TAILQ_REMOVE(&slp->sl_start, cb, ccb_chain);
+	scsi_low_free_ccb(cb);
+	return SCSI_LOW_DONE_COMPLETE;
+
+retry:
+	cb->ccb_rcnt ++;
+	if (slp->sl_start.tqh_first != cb)
+	{
+		TAILQ_REMOVE(&slp->sl_start, cb, ccb_chain);
+		TAILQ_INSERT_HEAD(&slp->sl_start, cb, ccb_chain);
+	}
+	return SCSI_LOW_DONE_RETRY;
+}
+
+/**************************************************************
+ * Reset
+ **************************************************************/
+static void
+scsi_low_clear_ccb(cb)
+	struct slccb *cb;
+{
+
+	cb->ccb_flags &= ~CCB_SENSE;
+	cb->ccb_tag = SCSI_LOW_UNKTAG;
+}
+
+static void
+scsi_low_reset_nexus(slp, fdone)
+	struct scsi_low_softc *slp;
+	int fdone;
+{
+	struct targ_info *ti;
+	struct lun_info *li;
+	struct slccb *cb, *ncb;
+
+	/* current nexus */
+	ti = slp->sl_nexus;
+	if (ti != NULL && (cb = ti->ti_nexus) != NULL)
+	{
+		scsi_low_clear_ccb(cb);
+		if (fdone != 0 && cb->ccb_rcnt ++ >= slp->sl_max_retry)
+		{
+			cb->ccb_error |= FATALIO;
+			scsi_low_done(slp, cb);
+		}
+	}
+
+	/* disconnected nexus */
+	for (ti = slp->sl_titab.tqh_first; ti != NULL;
+	     ti = ti->ti_chain.tqe_next)
+	{
+		for (cb = ti->ti_discq.tqh_first; cb != NULL; cb = ncb)
+		{
+		     	ncb = cb->ccb_chain.tqe_next;
+			TAILQ_REMOVE(&ti->ti_discq, cb, ccb_chain);
+			TAILQ_INSERT_HEAD(&slp->sl_start, cb, ccb_chain);
+			scsi_low_clear_ccb(cb);
+			if (fdone != 0 && cb->ccb_rcnt ++ >= slp->sl_max_retry)
+			{
+				cb->ccb_error |= FATALIO;
+				scsi_low_done(slp, cb);
+			}
+		}
+
+		for (li = LIST_FIRST(&ti->ti_litab); li != NULL;
+		     li = LIST_NEXT(li, lun_chain))
+		{
+			li->li_state = UNIT_SLEEP;
+			li->li_disc = 0;
+			((*slp->sl_funcs->scsi_low_lun_init) (slp, ti, li));
+			scsi_low_calcf(ti, li);
+		}
+
+		scsi_low_init_msgsys(slp, ti);
+		scsi_low_clear_nexus(slp, ti);
+		SCSI_LOW_SETUP_PHASE(ti, PH_NULL);
+	}
+
+	slp->sl_flags &= ~HW_PDMASTART;
+	slp->sl_disc = 0;
+}
+
+/* misc */
+static int tw_pos;
+static char tw_chars[] = "|/-\\";
+
+static void
+scsi_low_twiddle_wait(void)
+{
+
+	cnputc('\b');
+	cnputc(tw_chars[tw_pos++]);
+	tw_pos %= (sizeof(tw_chars) - 1);
+	delay(TWIDDLEWAIT);
+}
+
+void
+scsi_low_bus_reset(slp)
+	struct scsi_low_softc *slp;
+{
+	int i;
+
+	(*slp->sl_funcs->scsi_low_bus_reset) (slp);
+
+	printf("%s: try to reset scsi bus  ", slp->sl_xname);
+	for (i = 0; i <= SCSI2_RESET_DELAY / TWIDDLEWAIT ; i++)
+		scsi_low_twiddle_wait();
+	cnputc('\b');
+	printf("\n");
+}
+
+int
+scsi_low_restart(slp, flags, s)
+	struct scsi_low_softc *slp;
+	int flags;
+	u_char *s;
+{
+	int error;
+
+	if (s != NULL)
+		printf("%s: scsi bus restart. reason: %s\n", slp->sl_xname, s);
+
+	if ((error = scsi_low_init(slp, flags)) != 0)
+		return error;
+
+	scsi_low_start(slp);
+	return 0;
+}
+
+/**************************************************************
+ * disconnect and reselect
+ **************************************************************/
+#define	MSGCMD_LUN(msg)	(msg & 0x07)
+
+static struct lun_info *
+scsi_low_establish_lun(ti, lun)
+	struct targ_info *ti;
+	int lun;
+{
+	struct lun_info *li;
+
+	li = scsi_low_alloc_li(ti, lun, 0);
+	if (li == NULL)
+		return li;
+
+	ti->ti_li = li;
+	return li;
+}
+
+static struct slccb *
+scsi_low_establish_ccb(ti, li, tag)
+	struct targ_info *ti;
+	struct lun_info *li;
+	scsi_low_tag_t tag;
+{
+	struct scsi_low_softc *slp = ti->ti_sc;
+	struct slccb *cb;
+
+	/*
+	 * Search ccb matching with lun and tag.
+	 */
+	cb = ti->ti_discq.tqh_first;
+	for ( ; cb != NULL; cb = cb->ccb_chain.tqe_next)
+		if (cb->li == li && cb->ccb_tag == tag)
+			goto found;
+	return cb;
+
+	/* 
+	 * establish our ccb nexus
+	 */
+found:
+	TAILQ_REMOVE(&ti->ti_discq, cb, ccb_chain);
+	TAILQ_INSERT_HEAD(&slp->sl_start, cb, ccb_chain);
+	ti->ti_nexus = cb;
+
+	slp->sl_scp = cb->ccb_sscp;
+	slp->sl_error |= cb->ccb_error;
+
+	slp->sl_disc --;
+	li->li_disc --;
+
+	/* inform "ccb nexus established" to the host driver */
+	slp->sl_nexus_call = 1;
+	(*slp->sl_funcs->scsi_low_establish_nexus) (slp, ti);
+	return cb;
+}
+
+struct targ_info *
+scsi_low_reselected(slp, targ)
+	struct scsi_low_softc *slp;
+	u_int targ;
+{
+	struct targ_info *ti;
+	u_char *s;
+
+	/* 
+	 * Check select vs reselected collision.
+	 */
+
+	if ((ti = slp->sl_selid) != NULL)
+	{
+		scsi_low_clear_nexus(slp, ti);
+		SCSI_LOW_SETUP_PHASE(ti, PH_NULL);
+#ifdef	SCSI_LOW_STATICS
+		scsi_low_statics.nexus_conflict ++;
+#endif	/* SCSI_LOW_STATICS */
+	}
+	else if (slp->sl_nexus != NULL)
+	{
+		s = "host busy";
+		goto world_restart;
+	}
+
+	/* 
+	 * Check a valid target id asserted ?
+	 */
+	if (targ >= slp->sl_ntargs || targ == slp->sl_hostid)
+	{
+		s = "scsi id illegal";
+		goto world_restart;
+	}
+
+	/* 
+	 * Check the target scsi status.
+	 */
+	ti = slp->sl_ti[targ];
+	if (ti->ti_phase != PH_DISC)
+	{
+		s = "phase mismatch";
+		goto world_restart;
+	}
+
+	/* 
+	 * Setup lun and init msgsys
+	 */
+	slp->sl_error = 0;
+	scsi_low_init_msgsys(slp, ti);
+
+	/* 
+	 * Establish our target nexus
+	 * Remark: ccb and scsi pointer not yet restored 
+	 * 	   if lun != SCSI_LOW_UNKLUN.
+	 */
+	SCSI_LOW_SETUP_PHASE(ti, PH_RESEL);
+	slp->sl_nexus = ti;
+#ifdef	SCSI_LOW_STATICS
+	scsi_low_statics.nexus_reselected ++;
+#endif	/* SCSI_LOW_STATICS */
+	return ti;
+
+world_restart:
+	printf("%s: reselect(%x:unknown) %s\n", slp->sl_xname, targ, s);
+	scsi_low_restart(slp, SCSI_LOW_RESTART_HARD, 
+		         "reselect: scsi world confused");
+	return NULL;
+}
+
+int
+scsi_low_disconnected(slp, ti)
+	struct scsi_low_softc *slp;
+	struct targ_info *ti;
+{
+	struct slccb *cb = ti->ti_nexus;
+
+	/* check phase completion */
+	switch (slp->sl_msgphase)
+	{
+	case MSGPH_DISC:
+		if (cb != NULL)
+		{
+			TAILQ_REMOVE(&slp->sl_start, cb, ccb_chain);
+			TAILQ_INSERT_TAIL(&ti->ti_discq, cb, ccb_chain);
+			cb->ccb_error |= slp->sl_error;
+			cb->li->li_disc ++;
+			slp->sl_disc ++;
+		}
+		SCSI_LOW_SETUP_PHASE(ti, PH_DISC);
+#ifdef	SCSI_LOW_STATICS
+		scsi_low_statics.nexus_disconnected ++;
+#endif	/* SCSI_LOW_STATICS */
+		break;
+
+	case MSGPH_NULL:
+		slp->sl_error |= FATALIO;
+
+	case MSGPH_CMDC:
+		if (cb != NULL)
+		{
+			cb->ccb_error |= slp->sl_error;
+			scsi_low_done(slp, cb);
+		}
+		SCSI_LOW_SETUP_PHASE(ti, PH_NULL);
+		break;
+	}
+
+	scsi_low_clear_nexus(slp, ti);	
+	scsi_low_start(slp);
+	return 1;
+}
+
+/**************************************************************
+ * cmd out pointer setup
+ **************************************************************/
+int
+scsi_low_cmd(slp, ti)
+	struct scsi_low_softc *slp;
+	struct targ_info *ti;
+{
+	struct slccb *cb = ti->ti_nexus;
+	
+	if (cb == NULL)
+	{
+		/*
+		 * no slccb, abort!
+		 */
+		slp->sl_scp.scp_cmd = (u_int8_t *) &unit_ready_cmd;
+		slp->sl_scp.scp_cmdlen = sizeof(unit_ready_cmd);
+		slp->sl_scp.scp_datalen = 0;
+		slp->sl_scp.scp_direction = SCSI_LOW_READ;
+		scsi_low_assert_msg(slp, ti, SCSI_LOW_MSG_ABORT, 1);
+		scsi_low_info(slp, ti, "CMDOUT: slccb nexus not found");
+	}
+	else if (slp->sl_nexus_call == 0)
+	{
+		slp->sl_nexus_call = 1;
+		(*slp->sl_funcs->scsi_low_establish_nexus) (slp, ti);
+	}
+	return 0;
+}
+
+/**************************************************************
+ * data out pointer setup
+ **************************************************************/
+int
+scsi_low_data(slp, ti, bp, direction)
+	struct scsi_low_softc *slp;
+	struct targ_info *ti;
+	struct buf **bp;
+	int direction;
+{
+	struct slccb *cb = ti->ti_nexus;
+
+	if (cb == NULL)
+	{
+		scsi_low_assert_msg(slp, ti, SCSI_LOW_MSG_ABORT, 1);
+		scsi_low_info(slp, ti, "DATA PHASE: slccb nexus not found");
+		return EINVAL;
+	}
+
+	if (direction != cb->ccb_scp.scp_direction)
+	{
+		scsi_low_info(slp, ti, "DATA PHASE: xfer direction mismatch");
+		return EINVAL;
+	}
+
+#ifdef CAM
+	*bp = NULL; /* (cb->ccb == NULL) ? NULL : cb->bp; */
+#else
+	*bp = (cb->xs == NULL) ? NULL : cb->xs->bp;
+#endif
+	return 0;
+}
+
+/**************************************************************
+ * MSG_SYS 
+ **************************************************************/
+#define	MSGINPTR_CLR(ti) {(ti)->ti_msginptr = 0; (ti)->ti_msginlen = 0;}
+#define	MSGIN_PERIOD(ti) ((ti)->ti_msgin[3])
+#define	MSGIN_OFFSET(ti) ((ti)->ti_msgin[4])
+#define	MSGIN_DATA_LAST	0x30
+
+static int scsi_low_errfunc_synch __P((struct targ_info *, u_int));
+static int scsi_low_errfunc_wide __P((struct targ_info *, u_int));
+static int scsi_low_errfunc_identify __P((struct targ_info *, u_int));
+
+static int scsi_low_msgfunc_synch __P((struct targ_info *));
+static int scsi_low_msgfunc_wide __P((struct targ_info *));
+static int scsi_low_msgfunc_identify __P((struct targ_info *));
+static int scsi_low_msgfunc_user __P((struct targ_info *));
+static int scsi_low_msgfunc_abort __P((struct targ_info *));
+
+struct scsi_low_msgout_data {
+	u_int	md_flags;
+	u_int8_t md_msg;
+	int (*md_msgfunc) __P((struct targ_info *));
+	int (*md_errfunc) __P((struct targ_info *, u_int));
+};
+
+struct scsi_low_msgout_data scsi_low_msgout_data[] = {
+/* 0 */	{SCSI_LOW_MSG_RESET, MSG_RESET, scsi_low_msgfunc_abort, NULL},
+/* 1 */ {SCSI_LOW_MSG_ABORT, MSG_ABORT, scsi_low_msgfunc_abort, NULL},
+/* 2 */ {SCSI_LOW_MSG_REJECT, MSG_REJECT, NULL, NULL},
+/* 3 */ {SCSI_LOW_MSG_PARITY, MSG_PARITY, NULL, NULL},
+/* 4 */ {SCSI_LOW_MSG_ERROR, MSG_I_ERROR, NULL, NULL},
+/* 5 */ {SCSI_LOW_MSG_IDENTIFY, 0, scsi_low_msgfunc_identify, scsi_low_errfunc_identify},
+/* 6 */ {SCSI_LOW_MSG_SYNCH, 0, scsi_low_msgfunc_synch, scsi_low_errfunc_synch},
+/* 7 */ {SCSI_LOW_MSG_WIDE, 0, scsi_low_msgfunc_wide, scsi_low_errfunc_wide},
+/* 8 */ {SCSI_LOW_MSG_USER, 0, scsi_low_msgfunc_user, NULL},
+/* 9 */ {SCSI_LOW_MSG_NOOP, MSG_NOOP, NULL, NULL},
+/* 10 */ {SCSI_LOW_MSG_ALL, 0},
+};
+
+static int scsi_low_msginfunc_ext __P((struct targ_info *));
+static int scsi_low_synch __P((struct targ_info *));
+static int scsi_low_msginfunc_msg_reject __P((struct targ_info *));
+static int scsi_low_msginfunc_rejop __P((struct targ_info *));
+static int scsi_low_msginfunc_rdp __P((struct targ_info *));
+static int scsi_low_msginfunc_sdp __P((struct targ_info *));
+static int scsi_low_msginfunc_disc __P((struct targ_info *));
+static int scsi_low_msginfunc_cc __P((struct targ_info *));
+static int scsi_low_msginfunc_parity __P((struct targ_info *));
+static int scsi_low_msginfunc_noop __P((struct targ_info *));
+static void scsi_low_retry_phase __P((struct targ_info *));
+
+struct scsi_low_msgin_data {
+	u_int md_len;
+	int (*md_msgfunc) __P((struct targ_info *));
+};
+
+struct scsi_low_msgin_data scsi_low_msgin_data[] = {
+/* 0 */	{1,	scsi_low_msginfunc_cc},
+/* 1 */ {2,	scsi_low_msginfunc_ext},
+/* 2 */ {1,	scsi_low_msginfunc_sdp},
+/* 3 */ {1,	scsi_low_msginfunc_rdp},
+/* 4 */ {1,	scsi_low_msginfunc_disc},
+/* 5 */ {1,	scsi_low_msginfunc_rejop},
+/* 6 */ {1,	scsi_low_msginfunc_rejop},
+/* 7 */ {1,	scsi_low_msginfunc_msg_reject},
+/* 8 */ {1,	scsi_low_msginfunc_noop},
+/* 9 */ {1,	scsi_low_msginfunc_parity},
+/* a */ {1,	scsi_low_msginfunc_rejop},
+/* b */ {1,	scsi_low_msginfunc_rejop},
+/* c */ {1,	scsi_low_msginfunc_rejop},
+/* d */ {2,	scsi_low_msginfunc_rejop},
+/* e */ {1,	scsi_low_msginfunc_rejop},
+/* f */ {1,	scsi_low_msginfunc_rejop},
+/* 0x10 */ {1,	scsi_low_msginfunc_rejop},
+/* 0x11 */ {1,	scsi_low_msginfunc_rejop},
+/* 0x12 */ {1,	scsi_low_msginfunc_rejop},
+/* 0x13 */ {1,	scsi_low_msginfunc_rejop},
+/* 0x14 */ {1,	scsi_low_msginfunc_rejop},
+/* 0x15 */ {1,	scsi_low_msginfunc_rejop},
+/* 0x16 */ {1,	scsi_low_msginfunc_rejop},
+/* 0x17 */ {1,	scsi_low_msginfunc_rejop},
+/* 0x18 */ {1,	scsi_low_msginfunc_rejop},
+/* 0x19 */ {1,	scsi_low_msginfunc_rejop},
+/* 0x1a */ {1,	scsi_low_msginfunc_rejop},
+/* 0x1b */ {1,	scsi_low_msginfunc_rejop},
+/* 0x1c */ {1,	scsi_low_msginfunc_rejop},
+/* 0x1d */ {1,	scsi_low_msginfunc_rejop},
+/* 0x1e */ {1,	scsi_low_msginfunc_rejop},
+/* 0x1f */ {1,	scsi_low_msginfunc_rejop},
+/* 0x20 */ {2,	scsi_low_msginfunc_rejop},
+/* 0x21 */ {2,	scsi_low_msginfunc_rejop},
+/* 0x22 */ {2,	scsi_low_msginfunc_rejop},
+/* 0x23 */ {2,	scsi_low_msginfunc_rejop},
+/* 0x24 */ {2,	scsi_low_msginfunc_rejop},
+/* 0x25 */ {2,	scsi_low_msginfunc_rejop},
+/* 0x26 */ {2,	scsi_low_msginfunc_rejop},
+/* 0x27 */ {2,	scsi_low_msginfunc_rejop},
+/* 0x28 */ {2,	scsi_low_msginfunc_rejop},
+/* 0x29 */ {2,	scsi_low_msginfunc_rejop},
+/* 0x2a */ {2,	scsi_low_msginfunc_rejop},
+/* 0x2b */ {2,	scsi_low_msginfunc_rejop},
+/* 0x2c */ {2,	scsi_low_msginfunc_rejop},
+/* 0x2d */ {2,	scsi_low_msginfunc_rejop},
+/* 0x2e */ {2,	scsi_low_msginfunc_rejop},
+/* 0x2f */ {2,	scsi_low_msginfunc_rejop},
+/* 0x30 */ {1,	scsi_low_msginfunc_rejop}	/* default rej op */
+};
+
+static void
+scsi_low_init_msgsys(slp, ti)
+	struct scsi_low_softc *slp;
+	struct targ_info *ti;
+{
+
+	ti->ti_msginptr = 0;
+	ti->ti_emsgflags = ti->ti_msgflags = ti->ti_omsgflags = 0;
+	ti->ti_tflags &= ~TARG_ASSERT_ATN;
+	SCSI_LOW_SETUP_MSGPHASE(slp, MSGPH_NULL);
+}
+
+/**************************************************************
+ * msgout
+ **************************************************************/
+static int
+scsi_low_msgfunc_synch(ti)
+	struct targ_info *ti;
+{
+	struct lun_info *li = ti->ti_li;
+	int ptr = ti->ti_msgoutlen;
+
+	if (li == NULL)
+	{
+		scsi_low_assert_msg(ti->ti_sc, ti, SCSI_LOW_MSG_ABORT, 0);
+		return EINVAL;
+	}
+
+	ti->ti_msgoutstr[ptr + 0] = MSG_EXTEND;
+	ti->ti_msgoutstr[ptr + 1] = MSG_EXTEND_SYNCHLEN;
+	ti->ti_msgoutstr[ptr + 2] = MSG_EXTEND_SYNCHCODE;
+	ti->ti_msgoutstr[ptr + 3] = li->li_maxsynch.period;
+	ti->ti_msgoutstr[ptr + 4] = li->li_maxsynch.offset;
+	return MSG_EXTEND_SYNCHLEN + 2;
+}
+
+static int
+scsi_low_msgfunc_wide(ti)
+	struct targ_info *ti;
+{
+	struct lun_info *li = ti->ti_li;
+	int ptr = ti->ti_msgoutlen;
+
+	if (li == NULL)
+	{
+		scsi_low_assert_msg(ti->ti_sc, ti, SCSI_LOW_MSG_ABORT, 0);
+		return EINVAL;
+	}
+
+	ti->ti_msgoutstr[ptr + 0] = MSG_EXTEND;
+	ti->ti_msgoutstr[ptr + 1] = MSG_EXTEND_WIDELEN;
+	ti->ti_msgoutstr[ptr + 2] = MSG_EXTEND_WIDECODE;
+	ti->ti_msgoutstr[ptr + 3] = li->li_width;
+	return MSG_EXTEND_WIDELEN + 2;
+}
+
+static int
+scsi_low_msgfunc_identify(ti)
+	struct targ_info *ti;
+{
+	int ptr = ti->ti_msgoutlen;;
+
+	if (ti->ti_li == NULL)
+	{
+		ti->ti_msgoutstr[ptr + 0] = 0x80;
+		scsi_low_info(ti->ti_sc, ti, "MSGOUT: lun unknown");
+		scsi_low_assert_msg(ti->ti_sc, ti, SCSI_LOW_MSG_ABORT, 0);
+	}
+	else
+	{
+		ti->ti_msgoutstr[ptr + 0] = ID_MSG_SETUP(ti);
+	}
+	return 1;
+}
+
+static int
+scsi_low_msgfunc_user(ti)
+	struct targ_info *ti;
+{
+#ifdef	SCSI_LOW_SUPPORT_USER_MSGOUT
+	struct slccb *cb = ti->ti_nexus;
+	int ptr = ti->ti_msgoutlen;;
+
+	if (ti->ti_nexus == NULL)
+	{
+		ti->ti_msgoutstr[ptr + 0] = MSG_NOOP;
+		return 1;
+	}
+	else
+	{
+		bcopy(cb->msgout, ti->ti_msgoutstr + ptr, SCSI_LOW_MAX_MSGLEN);
+		return cb->msgoutlen;
+	}
+#else	/* !SCSI_LOW_SUPPORT_USER_MSGOUT */
+	return 0;
+#endif	/* !SCSI_LOW_SUPPORT_USER_MSGOUT */
+}
+
+static int
+scsi_low_msgfunc_abort(ti)
+	struct targ_info *ti;
+{
+	struct scsi_low_softc *slp = ti->ti_sc;
+
+	/* The target should releases bus */
+	SCSI_LOW_SETUP_MSGPHASE(slp, MSGPH_CMDC);
+	slp->sl_error |= /* ABORTIO */ FATALIO;
+	return 1;
+}
+
+/*
+ * The following functions are called when targets give unexpected
+ * responces in msgin (after msgout).
+ */
+static int
+scsi_low_errfunc_identify(ti, msgflags)
+	struct targ_info *ti;
+	u_int msgflags;
+{
+	struct lun_info *li = ti->ti_li;
+
+	li->li_flags &= ~SCSI_LOW_DISC;
+	return 0;
+}
+
+static int
+scsi_low_errfunc_synch(ti, msgflags)
+	struct targ_info *ti;
+	u_int msgflags;
+{
+
+	/* XXX:
+	 * illegal behavior, however
+	 * there are buggy devices!
+	 */
+	MSGIN_PERIOD(ti) = 0;
+	MSGIN_OFFSET(ti) = 0;
+	scsi_low_synch(ti);
+	return 0;
+}
+
+static int
+scsi_low_errfunc_wide(ti, msgflags)
+	struct targ_info *ti;
+	u_int msgflags;
+{
+	struct lun_info *li = ti->ti_li;
+
+	li->li_width = 0;
+	return 0;
+}
+
+int
+scsi_low_msgout(slp, ti)
+	struct scsi_low_softc *slp;
+	struct targ_info *ti;
+{
+	struct scsi_low_msgout_data *mdp;
+	int len = 0;
+
+	/* STEP I.
+	 * Scsi phase changes.
+	 * Previously msgs asserted are accepted by our target or
+	 * processed by scsi_low_msgin.
+	 * Thus clear all saved informations.
+	 */
+	if (ti->ti_ophase != ti->ti_phase)
+	{
+		ti->ti_omsgflags = 0;
+		ti->ti_emsgflags = 0;
+	}
+
+	/* STEP II.
+	 * We did not assert attention, however still our target required
+	 * msgs. Resend previous msgs. 
+	 */
+	if (ti->ti_ophase == PH_MSGOUT && !(ti->ti_tflags & TARG_ASSERT_ATN))
+	{
+		ti->ti_msgflags |= ti->ti_omsgflags;
+#ifdef	SCSI_LOW_DIAGNOSTIC
+		printf("%s: scsi_low_msgout: retry msgout\n", slp->sl_xname);
+#endif	/* SCSI_LOW_DIAGNOSTIC */
+	}
+
+	/*
+	 * OK. clear flags.
+	 */
+	ti->ti_tflags &= ~TARG_ASSERT_ATN;
+
+	/* STEP III.
+	 * We have no msgs. send MSG_LOOP (OK?)
+	 */
+	if (scsi_low_is_msgout_continue(ti) == 0)
+		scsi_low_assert_msg(slp, ti, SCSI_LOW_MSG_NOOP, 0);
+
+	/* STEP IV.
+	 * Process all msgs
+	 */
+	ti->ti_msgoutlen = 0;
+	mdp = &scsi_low_msgout_data[0];
+	for ( ; mdp->md_flags != SCSI_LOW_MSG_ALL; mdp ++)
+	{
+		if ((ti->ti_msgflags & mdp->md_flags) != 0)
+		{
+			ti->ti_omsgflags |= mdp->md_flags;
+			ti->ti_msgflags &= ~mdp->md_flags;
+			ti->ti_emsgflags = mdp->md_flags;
+
+			ti->ti_msgoutstr[ti->ti_msgoutlen] = mdp->md_msg;
+			if (mdp->md_msgfunc != NULL)
+				len = (*mdp->md_msgfunc) (ti);
+			else
+				len = 1;
+
+			ti->ti_msgoutlen += len;
+			if ((slp->sl_cfgflags & CFG_MSGUNIFY) == 0 || 
+			    ti->ti_msgflags == 0)
+				break;
+			if (ti->ti_msgoutlen >= SCSI_LOW_MAX_MSGLEN - 5)
+				break;
+		}
+	}
+
+	if (scsi_low_is_msgout_continue(ti) != 0)
+	{
+#ifdef	SCSI_LOW_DIAGNOSTIC
+		printf("SCSI_LOW_ATTENTION(msgout): 0x%x\n", ti->ti_msgflags);
+#endif	/* SCSI_LOW_DIAGNOSTIC */
+		scsi_low_attention(slp, ti);
+	}
+
+	/*
+	 * OK. advance old phase.
+	 */
+	ti->ti_ophase = ti->ti_phase;
+	return ti->ti_msgoutlen;
+}
+
+/**************************************************************
+ * msgin
+ **************************************************************/
+static int
+scsi_low_msginfunc_noop(ti)
+	struct targ_info *ti;
+{
+
+	return 0;
+}
+
+static int
+scsi_low_msginfunc_rejop(ti)
+	struct targ_info *ti;
+{
+	struct scsi_low_softc *slp = ti->ti_sc;
+	u_int8_t msg = ti->ti_msgin[0];
+
+	printf("%s: MSGIN: msg 0x%x reject\n", slp->sl_xname, (u_int) msg);
+	scsi_low_assert_msg(slp, ti, SCSI_LOW_MSG_REJECT, 0);
+	return 0;
+}
+
+static int
+scsi_low_msginfunc_cc(ti)
+	struct targ_info *ti;
+{
+	struct scsi_low_softc *slp = ti->ti_sc;
+
+	SCSI_LOW_SETUP_MSGPHASE(slp, MSGPH_CMDC);
+	return 0;
+}
+
+static int
+scsi_low_msginfunc_disc(ti)
+	struct targ_info *ti;
+{
+	struct scsi_low_softc *slp = ti->ti_sc;
+
+	SCSI_LOW_SETUP_MSGPHASE(slp, MSGPH_DISC);
+	return 0;
+}
+
+static int
+scsi_low_msginfunc_sdp(ti)
+	struct targ_info *ti;
+{
+	struct scsi_low_softc *slp = ti->ti_sc;
+
+	if (ti->ti_nexus != NULL)
+		ti->ti_nexus->ccb_sscp = slp->sl_scp;
+	else
+		scsi_low_assert_msg(slp, ti, SCSI_LOW_MSG_REJECT, 0);
+	return 0;
+}
+
+static int
+scsi_low_msginfunc_rdp(ti)
+	struct targ_info *ti;
+{
+	struct scsi_low_softc *slp = ti->ti_sc;
+
+	if (ti->ti_nexus != NULL)
+		slp->sl_scp = ti->ti_nexus->ccb_sscp;
+	else
+		scsi_low_assert_msg(slp, ti, SCSI_LOW_MSG_REJECT, 0);
+	return 0;
+}
+
+static int
+scsi_low_synch(ti)
+	struct targ_info *ti;
+{
+	struct scsi_low_softc *slp = ti->ti_sc;
+	struct lun_info *li = ti->ti_li;
+	u_int period = 0, offset = 0, speed;
+	u_char *s;
+	int error;
+
+	if (MSGIN_PERIOD(ti) >= li->li_maxsynch.period &&
+	    MSGIN_OFFSET(ti) <= li->li_maxsynch.offset)
+	{
+		if ((offset = MSGIN_OFFSET(ti)) != 0)
+			period = MSGIN_PERIOD(ti);
+		s = offset ? "synchronous" : "async";
+	}
+	else
+	{
+		/* XXX:
+		 * Target seems to be brain damaged.
+		 * Force async transfer.
+		 */
+		li->li_maxsynch.period = 0;
+		li->li_maxsynch.offset = 0;
+		printf("%s: target brain damaged. async transfer\n",
+			slp->sl_xname);
+		return EINVAL;
+	}
+
+	li->li_maxsynch.period = period;
+	li->li_maxsynch.offset = offset;
+
+	error = (*slp->sl_funcs->scsi_low_msg) (slp, ti, SCSI_LOW_MSG_SYNCH);
+	if (error != 0)
+	{
+		/* XXX:
+		 * Current period and offset are not acceptable 
+		 * for our adapter.
+		 * The adapter changes max synch and max offset.
+		 */
+		printf("%s: synch neg failed. retry synch msg neg ...\n",
+			slp->sl_xname);
+		return error;
+	}
+
+#ifdef SCSI_LOW_INFORM
+	/* inform data */
+	printf("%s(%d:%d): <%s> offset %d period %dns ",
+		slp->sl_xname, ti->ti_id, li->li_lun, s, offset, period * 4);
+	if (period != 0)
+	{
+		speed = 1000 * 10 / (period * 4);
+		printf("%d.%d M/s", speed / 10, speed % 10);
+	}
+	printf("\n");
+#endif
+
+	return 0;
+}
+
+static int
+scsi_low_msginfunc_ext(ti)
+	struct targ_info *ti;
+{
+	struct scsi_low_softc *slp = ti->ti_sc;
+	struct slccb *cb = ti->ti_nexus;
+	struct lun_info *li = ti->ti_li;
+	int count, retry;
+	u_int32_t *ptr;
+
+	if (ti->ti_msginptr == 2)
+	{
+		ti->ti_msginlen = ti->ti_msgin[1] + 2;
+		return 0;
+	}
+
+	switch (MKMSG_EXTEND(ti->ti_msgin[1], ti->ti_msgin[2]))
+	{
+	case MKMSG_EXTEND(MSG_EXTEND_MDPLEN, MSG_EXTEND_MDPCODE):
+		if (cb == NULL)
+			break;
+
+		ptr = (u_int32_t *)(&ti->ti_msgin[3]);
+		count = (int) htonl((long) (*ptr));
+		if(slp->sl_scp.scp_datalen - count < 0 || 
+		   slp->sl_scp.scp_datalen - count > cb->ccb_scp.scp_datalen)
+			break;
+
+		slp->sl_scp.scp_datalen -= count;
+		slp->sl_scp.scp_data += count;
+		return 0;
+
+	case MKMSG_EXTEND(MSG_EXTEND_SYNCHLEN, MSG_EXTEND_SYNCHCODE):
+		if (li == NULL)
+			break;
+
+		retry = scsi_low_synch(ti);
+		if (retry != 0 || (ti->ti_emsgflags & SCSI_LOW_MSG_SYNCH) == 0)
+			scsi_low_assert_msg(slp, ti, SCSI_LOW_MSG_SYNCH, 0);
+		return 0;
+
+	case MKMSG_EXTEND(MSG_EXTEND_WIDELEN, MSG_EXTEND_WIDECODE):
+		if (li == NULL)
+			break;
+
+		scsi_low_assert_msg(slp, ti, SCSI_LOW_MSG_WIDE, 0);
+		return 0;
+
+	default:
+		break;
+	}
+
+	scsi_low_assert_msg(slp, ti, SCSI_LOW_MSG_REJECT, 0);
+	return EINVAL;
+}
+
+static void
+scsi_low_retry_phase(ti)
+	struct targ_info *ti;
+{
+
+	switch (ti->ti_sphase)
+	{
+	case PH_MSGOUT:
+		ti->ti_msgflags |= ti->ti_omsgflags;	
+		break;
+
+	default:
+		break;
+	}
+}
+
+static int
+scsi_low_msginfunc_parity(ti)
+	struct targ_info *ti;
+{
+	struct scsi_low_softc *slp = ti->ti_sc;
+
+	if (ti->ti_sphase != PH_MSGOUT)
+		slp->sl_error |= PARITYERR;
+	scsi_low_retry_phase(ti);
+	return 0;
+}
+
+static int
+scsi_low_msginfunc_msg_reject(ti)
+	struct targ_info *ti;
+{
+	struct scsi_low_softc *slp = ti->ti_sc;
+	struct lun_info *li = ti->ti_li;
+	struct scsi_low_msgout_data *mdp;
+	u_int msgflags;
+
+	if (li == NULL)
+	{
+		/* not yet lun nexus established! */
+		goto out;
+	}
+
+	switch (ti->ti_sphase)
+	{
+	case PH_CMD:
+		slp->sl_error |= CMDREJECT;
+		break;
+
+	case PH_MSGOUT:
+		if (ti->ti_emsgflags == 0)
+			break;
+
+		msgflags = SCSI_LOW_MSG_REJECT;
+		mdp = &scsi_low_msgout_data[0];
+		for ( ; mdp->md_flags != SCSI_LOW_MSG_ALL; mdp ++)
+		{
+			if ((ti->ti_emsgflags & mdp->md_flags) != 0)
+			{
+				ti->ti_emsgflags &= ~mdp->md_flags;
+				if (mdp->md_errfunc != NULL)
+					(*mdp->md_errfunc) (ti, msgflags);
+				break;
+			}
+		}
+		break;
+
+	default:
+		break;
+	}
+
+out:
+	scsi_low_info(slp, ti, "msg rejected");
+	slp->sl_error |= MSGERR;
+	return 0;
+}
+
+void
+scsi_low_msgin(slp, ti, c)
+	struct scsi_low_softc *slp;
+	struct targ_info *ti;
+	u_int8_t c;
+{
+	struct scsi_low_msgin_data *sdp;
+	struct lun_info *li;
+	u_int8_t msg;
+
+	/*
+	 * Phase changes, clear the pointer.
+	 */
+	if (ti->ti_ophase != ti->ti_phase)
+	{
+		ti->ti_sphase = ti->ti_ophase;
+		ti->ti_ophase = ti->ti_phase;
+		MSGINPTR_CLR(ti);
+#ifdef	SCSI_LOW_DIAGNOSTIC
+		ti->ti_msgin_hist_pointer = 0;
+#endif	/* SCSI_LOW_DIAGNOSTIC */
+	}
+
+	/*
+	 * Store a current messages byte into buffer and 
+	 * wait for the completion of the current msg.
+	 */
+	ti->ti_msgin[ti->ti_msginptr ++] = c;
+	if (ti->ti_msginptr >= SCSI_LOW_MAX_MSGLEN)
+	{
+		ti->ti_msginptr = SCSI_LOW_MAX_MSGLEN - 1;
+		scsi_low_assert_msg(slp, ti, SCSI_LOW_MSG_REJECT, 0);
+	}	
+
+	/*
+	 * Calculate messages length.
+	 */
+	msg = ti->ti_msgin[0];
+	if (msg < MSGIN_DATA_LAST)
+		sdp = &scsi_low_msgin_data[msg];
+	else
+		sdp = &scsi_low_msgin_data[MSGIN_DATA_LAST];
+
+	if (ti->ti_msginlen == 0)
+	{
+		ti->ti_msginlen = sdp->md_len;
+#ifdef	SCSI_LOW_DIAGNOSTIC
+	    	if (ti->ti_msgin_hist_pointer < MSGIN_HISTORY_LEN)
+		{
+			ti->ti_msgin_history[ti->ti_msgin_hist_pointer] = msg;
+			ti->ti_msgin_hist_pointer ++;
+		}
+#endif	/* SCSI_LOW_DIAGNOSTIC */
+	}
+
+	/*
+	 * Check comletion.
+	 */
+	if (ti->ti_msginptr < ti->ti_msginlen)
+		return;
+
+	/*
+	 * Do process.
+	 */
+	if ((msg & MSG_IDENTIFY) == 0)
+	{
+		(void) ((*sdp->md_msgfunc) (ti));
+	}
+	else
+	{
+		li = ti->ti_li;
+		if (li == NULL)
+		{
+			li = scsi_low_establish_lun(ti, MSGCMD_LUN(msg));
+			if (li == NULL)
+				goto badlun;
+		}	
+
+		if (ti->ti_nexus == NULL)
+		{
+			/* XXX:
+		 	 * move the following functions to
+			 * tag queue msg process in the future.
+			 */
+			if (!scsi_low_establish_ccb(ti, li, SCSI_LOW_UNKTAG))
+				goto badlun;
+		}
+
+		if (MSGCMD_LUN(msg) != li->li_lun)
+			goto badlun;
+	}
+
+	/*
+	 * Msg process completed, reset msin pointer and assert ATN if desired.
+	 */
+	if (ti->ti_msginptr >= ti->ti_msginlen)
+	{
+		ti->ti_sphase = ti->ti_phase;
+		MSGINPTR_CLR(ti);
+
+		if (scsi_low_is_msgout_continue(ti) != 0)
+		{
+#ifdef	SCSI_LOW_DIAGNOSTIC
+			printf("SCSI_LOW_ATTETION(msgin): 0x%x\n", 
+				ti->ti_msgflags);
+#endif	/* SCSI_LOW_DIAGNOSTIC */
+			scsi_low_attention(slp, ti);
+		}
+	}
+	return;
+
+badlun:
+	scsi_low_info(slp, ti, "MSGIN: identify lun mismatch");
+	scsi_low_assert_msg(slp, ti, SCSI_LOW_MSG_ABORT, 0);
+}
+
+/**************************************************************
+ * Qurik setup
+ **************************************************************/
+#define	MAXOFFSET	0x10
+
+static void
+scsi_low_calcf(ti, li)
+	struct targ_info *ti;
+	struct lun_info *li;
+{
+	u_int period;
+	u_int8_t offset;
+	struct scsi_low_softc *slp = ti->ti_sc;
+
+	li->li_flags &= ~SCSI_LOW_DISC;
+	if ((slp->sl_cfgflags & CFG_NODISC) == 0 &&
+#ifdef	SDEV_NODISC
+	    (li->li_quirks & SDEV_NODISC) == 0 &&
+#endif	/* SDEV_NODISC */
+	    (li->li_cfgflags & SCSI_LOW_DISC) != 0)
+		li->li_flags |= SCSI_LOW_DISC;
+
+	li->li_flags |= SCSI_LOW_NOPARITY;
+	if ((slp->sl_cfgflags & CFG_NOPARITY) == 0 &&
+#ifdef	SDEV_NOPARITY
+	    (li->li_quirks & SDEV_NOPARITY) == 0 &&
+#endif	/* SDEV_NOPARITY */
+	    (li->li_cfgflags & SCSI_LOW_NOPARITY) == 0)
+		li->li_flags &= ~SCSI_LOW_NOPARITY;
+
+	li->li_flags &= ~SCSI_LOW_SYNC;
+	if ((li->li_cfgflags & SCSI_LOW_SYNC) &&
+	    (slp->sl_cfgflags & CFG_ASYNC) == 0)
+	{
+		offset = SCSI_LOW_OFFSET(li->li_cfgflags);
+		if (offset > li->li_maxsynch.offset)
+			offset = li->li_maxsynch.offset;
+		li->li_flags |= SCSI_LOW_SYNC;
+	}
+	else
+		offset = 0;
+	
+	if (offset > 0)
+	{
+		period = SCSI_LOW_PERIOD(li->li_cfgflags);
+		if (period > SCSI_LOW_MAX_SYNCH_SPEED)
+			period = SCSI_LOW_MAX_SYNCH_SPEED;
+		if (period != 0)
+			period = 1000 * 10 / (period * 4);
+		if (period < li->li_maxsynch.period)
+			period = li->li_maxsynch.period;
+	}
+	else
+		period = 0;
+
+	li->li_maxsynch.offset = offset;
+	li->li_maxsynch.period = period;
+}
+
+#ifdef	SCSI_LOW_TARGET_OPEN
+static int
+scsi_low_target_open(link, cf)
+	struct scsipi_link *link;
+	struct cfdata *cf;
+{
+	u_int target = link->scsipi_scsi.target;
+	u_int lun = link->scsipi_scsi.lun;
+	struct scsi_low_softc *slp;
+	struct targ_info *ti;
+	struct lun_info *li;
+
+	slp = (struct scsi_low_softc *) link->adapter_softc;
+	ti = slp->sl_ti[target];
+	li = scsi_low_alloc_li(ti, lun, 0);
+	if (li == NULL)
+		return 0;
+
+	li->li_quirks = (u_int) link->quirks;
+	li->li_cfgflags = cf->cf_flags;
+	if (li->li_state > UNIT_SYNCH)
+		li->li_state = UNIT_SYNCH;
+
+	scsi_low_calcf(ti, li);
+
+	printf("%s(%d:%d): max period(%dns) max offset(%d) flags 0x%b\n",
+		slp->sl_xname, target, lun,
+		li->li_maxsynch.period * 4,
+		li->li_maxsynch.offset,
+		li->li_flags, SCSI_LOW_BITS);
+	return 0;
+}
+#endif	/* SCSI_LOW_TARGET_OPEN */
+
+/**********************************************************
+ * DEBUG SECTION
+ **********************************************************/
+static void
+scsi_low_info(slp, ti, s)
+	struct scsi_low_softc *slp;
+	struct targ_info *ti;
+	u_char *s;
+{
+
+	printf("%s: SCSI_LOW: %s\n", slp->sl_xname, s);
+	if (ti == NULL)
+	{
+		for (ti = slp->sl_titab.tqh_first; ti != NULL;
+		     ti = ti->ti_chain.tqe_next)
+			scsi_low_print(slp, ti);
+	}
+	else
+		scsi_low_print(slp, ti);
+			
+}
+
+static u_char *phase[] =
+{
+	"FREE", "ARBSTART", "SELSTART", "SELECTED",
+	"CMDOUT", "DATA", "MSGIN", "MSGOUT", "STATIN", "DISC", "RESEL"
+};
+
+void
+scsi_low_print(slp, ti)
+	struct scsi_low_softc *slp;
+	struct targ_info *ti;
+{
+	struct slccb *cb = NULL;
+
+	if (ti == NULL)
+		ti = slp->sl_nexus;
+	if (ti != NULL)
+		cb = ti->ti_nexus;
+
+	printf("%s: TARGET(0x%lx) T_NEXUS(0x%lx) C_NEXUS(0x%lx) NDISCS(%d)\n",
+	       slp->sl_xname, (u_long) ti, (u_long) slp->sl_nexus,
+	       (u_long) cb, slp->sl_disc);
+
+	/* target stat */
+	if (ti != NULL)
+	{
+		struct sc_p *sp = &slp->sl_scp;
+		struct lun_info *li = ti->ti_li;
+		u_int flags = 0;
+		int lun = -1;
+
+		if (li != NULL)
+		{
+			lun = li->li_lun;
+			flags = li->li_flags;
+		}
+
+		printf("%s(%d:%d) ph<%s> => ph<%s>\n", slp->sl_xname,
+		       ti->ti_id, lun, phase[(int) ti->ti_ophase], 
+		       phase[(int) ti->ti_phase]);
+
+printf("MSGIN: ptr(%x) [%x][%x][%x][%x][%x] STATUSIN: 0x%x T_FLAGS: 0x%x\n",
+		       (u_int) (ti->ti_msginptr), 
+		       (u_int) (ti->ti_msgin[0]),
+		       (u_int) (ti->ti_msgin[1]),
+		       (u_int) (ti->ti_msgin[2]),
+		       (u_int) (ti->ti_msgin[3]),
+		       (u_int) (ti->ti_msgin[4]),
+		       ti->ti_status, ti->ti_tflags);
+#ifdef	SCSI_LOW_DIAGNOSTIC
+printf("MSGIN HISTORY: (%d) [0x%x] => [0x%x] => [0x%x] => [0x%x] => [0x%x]\n",
+			ti->ti_msgin_hist_pointer,
+			(u_int) (ti->ti_msgin_history[0]),
+			(u_int) (ti->ti_msgin_history[1]),
+			(u_int) (ti->ti_msgin_history[2]),
+			(u_int) (ti->ti_msgin_history[3]),
+			(u_int) (ti->ti_msgin_history[4]));
+#endif	/* SCSI_LOW_DIAGNOSTIC */
+
+printf("MSGOUT: msgflags 0x%x [%x][%x][%x][%x][%x] msgoutlen %d C_FLAGS: %b\n",
+			(u_int) ti->ti_msgflags,
+			(u_int) (ti->ti_msgoutstr[0]), 
+			(u_int) (ti->ti_msgoutstr[1]), 
+			(u_int) (ti->ti_msgoutstr[2]), 
+			(u_int) (ti->ti_msgoutstr[3]), 
+			(u_int) (ti->ti_msgoutstr[4]), 
+		        ti->ti_msgoutlen,
+			flags, SCSI_LOW_BITS);
+
+printf("SCP: datalen 0x%x dataaddr 0x%lx ",
+			sp->scp_datalen,
+			(u_long) sp->scp_data);
+
+		if (cb != NULL)
+		{
+printf("CCB: cmdlen %x cmdaddr %lx cmd[0] %x datalen %x",
+		       cb->ccb_scp.scp_cmdlen, 
+		       (u_long) cb->ccb_scp.scp_cmd,
+		       (u_int) cb->ccb_scp.scp_cmd[0],
+		       cb->ccb_scp.scp_datalen);
+		}
+		printf("\n");
+	}
+	printf("error flags %b\n", slp->sl_error, SCSI_LOW_ERRORBITS);
+}
diff --git a/sys/cam/scsi/scsi_low.h b/sys/cam/scsi/scsi_low.h
new file mode 100644
index 0000000..0d8f996
--- /dev/null
+++ b/sys/cam/scsi/scsi_low.h
@@ -0,0 +1,615 @@
+/*	$FreeBSD$	*/
+/*	$NecBSD: scsi_low.h,v 1.24 1999/07/23 21:00:05 honda Exp $	*/
+/*	$NetBSD$	*/
+
+#define	SCSI_LOW_DIAGNOSTIC
+
+/*
+ * [NetBSD for NEC PC-98 series]
+ *  Copyright (c) 1995, 1996, 1997, 1998
+ *	NetBSD/pc98 porting staff. All rights reserved.
+ *  Copyright (c) 1995, 1996, 1997, 1998
+ *	Naofumi HONDA. 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. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ */
+
+#ifndef	_SCSI_LOW_H_
+#define	_SCSI_LOW_H_
+
+#ifdef __NetBSD__
+#include <i386/Cbus/dev/scsi_dvcfg.h>
+#endif
+#ifdef __FreeBSD__
+#include <sys/device_port.h>
+#define CAM
+#include <cam/cam.h>
+#include <cam/cam_ccb.h>
+#include <cam/cam_sim.h>
+#include <cam/cam_xpt_sim.h>
+#include <cam/cam_debug.h>
+
+#include <cam/scsi/scsi_dvcfg.h>
+#endif
+
+/* user configuration flags defs */
+#define	SCSI_LOW_SYNC		DVF_SCSI_SYNC
+#define	SCSI_LOW_DISC		DVF_SCSI_DISC
+#define	SCSI_LOW_WAIT		DVF_SCSI_WAIT
+#define	SCSI_LOW_LINK		DVF_SCSI_LINK
+#define	SCSI_LOW_QTAG		DVF_SCSI_QTAG
+#define	SCSI_LOW_NOPARITY	DVF_SCSI_NOPARITY
+#define	SCSI_LOW_SAVESP		DVF_SCSI_SAVESP
+#define	SCSI_LOW_DEFCFG		DVF_SCSI_DEFCFG
+#define	SCSI_LOW_BITS		DVF_SCSI_BITS
+
+#define	SCSI_LOW_PERIOD(n)	DVF_SCSI_PERIOD(n)
+#define	SCSI_LOW_OFFSET(n)	DVF_SCSI_OFFSET(n)
+
+/* host scsi id and targets macro */
+#ifndef	SCSI_LOW_NTARGETS
+#define	SCSI_LOW_NTARGETS			8
+#endif	/* SCSI_LOW_NTARGETS */
+#define	SCSI_LOW_NCCB				32
+
+#define	SCSI_LOW_MAX_MSGLEN			16
+#define	SCSI_LOW_MAX_RETRY			3
+
+/* timeout control macro */
+#define SCSI_LOW_MIN_TOUT			24
+#define SCSI_LOW_TIMEOUT_CHECK_INTERVAL 	4
+#define	SCSI_LOW_POWDOWN_TC			15
+#define	SCSI_LOW_MAX_PHCHANGES			256
+
+/* max synch period */
+#ifndef	SCSI_LOW_MAX_SYNCH_SPEED
+#define	SCSI_LOW_MAX_SYNCH_SPEED		(100)	/* 10.0M */
+#endif	/* !SCSI_LOW_MAX_SYNCH_SPEED */
+
+/*************************************************
+ * Scsi Data Pointer
+ *************************************************/
+/* scsi pointer */
+struct sc_p {
+	u_int8_t *scp_data;
+	int scp_datalen;
+
+	u_int8_t *scp_cmd;
+	int scp_cmdlen;
+
+	u_int scp_direction;
+#define	SCSI_LOW_RWUNK	(-1)
+#define	SCSI_LOW_WRITE	0
+#define	SCSI_LOW_READ	1
+};
+
+#define	SCSI_LOW_SETUP_PHASE(ti, phase)			\
+{							\
+	if ((ti)->ti_phase != (phase))			\
+	{						\
+		(ti)->ti_ophase = ti->ti_phase;		\
+		(ti)->ti_phase = (phase);		\
+	}						\
+}
+
+#define	SCSI_LOW_SETUP_MSGPHASE(slp, PHASE)		\
+{							\
+	(slp)->sl_msgphase = (PHASE);			\
+}
+
+#define	SCSI_LOW_TARGET_ASSERT_ATN(slp)			\
+{							\
+	(ti)->ti_tflags |= TARG_ASSERT_ATN;		\
+}
+
+/*************************************************
+ * Command Control Block Structure
+ *************************************************/
+typedef int scsi_low_tag_t;			
+struct targ_info;
+
+#define	SCSI_LOW_UNKLUN	((u_int) -1)
+#define	SCSI_LOW_UNKTAG	((scsi_low_tag_t) -1)
+
+struct slccb {
+	TAILQ_ENTRY(slccb) ccb_chain;
+
+#ifdef CAM
+	union ccb *ccb;
+	struct buf *bp;
+#else
+	struct scsipi_xfer *xs;		/* scsi upper */
+#endif
+	struct targ_info *ti;		/* targ_info */
+	struct lun_info *li;		/* lun info */
+	scsi_low_tag_t ccb_tag;		/* tag */
+
+	/*****************************************
+	 * Scsi data pointers (original and saved)
+	 *****************************************/
+	struct sc_p ccb_scp;		/* given */
+	struct sc_p ccb_sscp;		/* saved scsi data pointer */
+
+#ifdef	SCSI_LOW_SUPPORT_USER_MSGOUT
+	u_int8_t msgout[SCSI_LOW_MAX_MSGLEN];	/* scsi msgout */
+	u_int msgoutlen;
+#endif	/* SCSI_LOW_SUPPORT_USER_MSGOUT */
+
+	/*****************************************
+	 * Error or Timeout counters
+	 *****************************************/
+	u_int ccb_flags;
+#define	CCB_SENSE	0x01
+	u_int ccb_error;
+
+	int ccb_rcnt;			/* retry counter */
+	int ccb_tc;			/* timer counter */
+	int ccb_tcmax;			/* max timeout */
+
+	/*****************************************
+	 * Sense data buffer
+	 *****************************************/
+#ifdef __NetBSD__
+	struct scsipi_sense ccb_sense_cmd;
+	struct scsipi_sense_data ccb_sense;
+#endif
+#ifdef __FreeBSD__
+	struct scsi_sense ccb_sense_cmd;
+	struct scsi_sense_data ccb_sense;
+#endif
+};
+
+/* ccb assert */
+#ifdef __NetBSD__
+#include <dev/isa/ccbque.h>
+#endif
+#ifdef __FreeBSD__
+#include <i386/isa/ccbque.h>
+#endif
+GENERIC_CCB_ASSERT(scsi_low, slccb)
+
+/*************************************************
+ * Target structures
+ *************************************************/
+struct scsi_low_softc;
+TAILQ_HEAD(targ_info_tab, targ_info);
+LIST_HEAD(lun_info_tab, lun_info);
+
+struct lun_info {
+	int li_lun;
+	struct targ_info *li_ti;		/* my target */
+
+	LIST_ENTRY(lun_info) lun_chain;		/* targ_info link */
+
+	int li_disc;				/* num disconnects */
+	int li_maxnexus;
+
+	/*
+	 * lun state
+	 */
+#define	UNIT_SLEEP	0x00
+#define	UNIT_START	0x01
+#define	UNIT_SYNCH	0x02
+#define	UNIT_WIDE	0x03
+#define	UNIT_OK		0x04
+#define	UNIT_NEGSTART	UNIT_SYNCH
+	u_int li_state;				/* target lun state */
+	u_int li_maxstate;			/* max state */
+
+	/*
+	 * lun control flags
+ 	 */
+	u_int li_flags;				/* real control flags */
+	u_int li_cfgflags;			/* given target cfgflags */
+	u_int li_quirks;			/* given target quirk */
+
+	/*
+	 * lun synch and wide data
+ 	 */
+	struct synch {
+		u_int8_t offset;
+		u_int8_t period;
+	} li_maxsynch;		/* synch data */
+
+	u_int li_width;
+};
+
+struct targ_info {
+	TAILQ_ENTRY(targ_info) ti_chain;	/* targ_info link */
+
+	struct scsi_low_softc *ti_sc;		/* our softc */
+	u_int ti_id;				/* scsi id */
+
+	/*
+	 * Lun chain
+	 */
+	struct lun_info_tab ti_litab;		/* lun chain */
+
+	/*
+	 * Nexus
+	 */
+	struct slccb *ti_nexus;			/* current nexus */
+	struct lun_info *ti_li;			/* current nexus lun_info */
+
+	/*
+	 * Target status
+ 	 */
+#define	TARG_ASSERT_ATN	0x01
+	u_int ti_tflags;			/* target state I */
+
+	/*
+	 * Scsi phase control
+ 	 */
+	struct slccbtab ti_discq;			/* disconnect queue */
+
+#define	PH_NULL		0x00
+#define	PH_ARBSTART	0x01
+#define	PH_SELSTART	0x02
+#define	PH_SELECTED	0x03
+#define	PH_CMD		0x04
+#define	PH_DATA		0x05
+#define	PH_MSGIN	0x06
+#define	PH_MSGOUT	0x07
+#define	PH_STAT		0x08
+#define	PH_DISC		0x09
+#define	PH_RESEL	0x0a
+	u_int ti_phase;				/* scsi phase */
+	u_int ti_ophase;			/* old scsi phase */
+
+	/*
+	 * Status in
+ 	 */
+	u_int8_t ti_status;			/* status in */
+
+	/*
+	 * Msg in
+ 	 */
+	u_int ti_msginptr;			/* msgin ptr */
+	u_int ti_msginlen;			/* expected msg length */
+	u_int8_t ti_msgin[SCSI_LOW_MAX_MSGLEN];	/* msgin buffer */
+	u_int ti_sphase;
+
+#ifdef	SCSI_LOW_DIAGNOSTIC
+#define	MSGIN_HISTORY_LEN	5
+	u_int8_t ti_msgin_history[MSGIN_HISTORY_LEN];
+	int ti_msgin_hist_pointer;
+#endif	/* SCSI_LOW_DIAGNOSTIC */
+
+	/*
+	 * Msg out
+ 	 */
+	u_int ti_msgflags;			/* msgs to be asserted */
+	u_int ti_omsgflags;			/* msgs asserted */
+	u_int ti_emsgflags;			/* a msg currently asserted */
+#define	SCSI_LOW_MSG_RESET	0x00000001
+#define	SCSI_LOW_MSG_ABORT	0x00000002
+#define	SCSI_LOW_MSG_REJECT	0x00000004
+#define	SCSI_LOW_MSG_PARITY	0x00000008
+#define	SCSI_LOW_MSG_ERROR	0x00000010
+#define	SCSI_LOW_MSG_IDENTIFY	0x00000020
+#define	SCSI_LOW_MSG_SYNCH	0x00000040
+#define	SCSI_LOW_MSG_WIDE	0x00000080
+#define	SCSI_LOW_MSG_USER	0x00000100
+#define	SCSI_LOW_MSG_NOOP	0x00000200
+#define	SCSI_LOW_MSG_ALL	0xffffffff
+
+	/* msgout buffer */
+	u_int8_t ti_msgoutstr[SCSI_LOW_MAX_MSGLEN];	/* scsi msgout */
+	u_int ti_msgoutlen;			/* msgout strlen */
+
+	/*
+	 * lun info size.
+ 	 */
+	int ti_lunsize;	
+};
+
+/*************************************************
+ * COMMON HEADER STRUCTURE
+ *************************************************/
+struct scsi_low_softc;
+typedef struct scsi_low_softc *sc_low_t;
+
+#define	SCSI_LOW_START_OK	0
+#define	SCSI_LOW_START_FAIL	1
+
+#define	SC_LOW_INIT_T (int (*) __P((sc_low_t, int)))
+#define	SC_LOW_BUSRST_T (void (*) __P((sc_low_t)))
+#define	SC_LOW_LUN_INIT_T (int (*) __P((sc_low_t, struct targ_info *, struct lun_info *)))
+#define	SC_LOW_SELECT_T (int (*) __P((sc_low_t, struct slccb *)))
+#define	SC_LOW_ATTEN_T (void (*) __P((sc_low_t)))
+#define	SC_LOW_NEXUS_T (int (*) __P((sc_low_t, struct targ_info *)))
+#define	SC_LOW_MSG_T (int (*) __P((sc_low_t, struct targ_info *, u_int)))
+#define	SC_LOW_POLL_T (int (*) __P((void *)))
+#define	SC_LOW_POWER_T (int (*) __P((sc_low_t, u_int)))
+
+struct scsi_low_funcs {
+	int (*scsi_low_init) __P((sc_low_t, int));
+	void (*scsi_low_bus_reset) __P((sc_low_t));
+	int (*scsi_low_lun_init) __P((sc_low_t, struct targ_info *, struct lun_info *));
+
+	int (*scsi_low_start_bus) __P((sc_low_t, struct slccb *));
+	int (*scsi_low_establish_nexus) __P((sc_low_t, struct targ_info *));
+
+	void (*scsi_low_attention) __P((sc_low_t));
+	int (*scsi_low_msg) __P((sc_low_t, struct targ_info *, u_int));
+
+	int (*scsi_low_poll) __P((void *));
+
+#define	SCSI_LOW_POWDOWN	1
+#define	SCSI_LOW_ENGAGE		2
+	int (*scsi_low_power) __P((sc_low_t, u_int));
+};
+
+/*************************************************
+ * SCSI LOW SOFTC
+ *************************************************/
+struct scsi_low_softc {
+	DEVPORT_DEVICE sl_dev;
+	u_char sl_xname[16];
+				
+	/* upper interface */
+#ifdef CAM
+	struct cam_sim *sim;
+	struct cam_path *path;
+#else
+	struct scsipi_link sl_link;
+#endif
+
+	/* my targets */
+	struct targ_info *sl_ti[SCSI_LOW_NTARGETS];
+	struct targ_info_tab sl_titab;
+
+	/* current active nexus */
+	int sl_nexus_call;
+	struct targ_info *sl_nexus;
+
+	/* ccb start queue */
+	struct slccbtab sl_start;	
+
+	/* retry limit and phase change counter */
+	int sl_max_retry;
+	int sl_ph_count;
+
+	/* selection & total num disconnect targets */
+	int sl_disc;
+	struct targ_info *sl_selid;
+
+	/* scsi phased suggested by scsi msg */
+	u_int sl_msgphase;	
+#define	MSGPH_NULL	0x00		/* no msg */
+#define	MSGPH_DISC	0x01		/* disconnect msg */
+#define	MSGPH_CMDC	0x02		/* cmd complete msg */
+
+	/* error */
+#define	FATALIO		0x01		/* generic io error & retry io */
+#define	ABORTIO		0x02		/* generic io error & terminate io */
+#define	TIMEOUTIO	0x04		/* watch dog timeout */
+#define	SELTIMEOUTIO	0x08		/* selection timeout */
+#define	PDMAERR		0x10		/* dma xfer error */
+#define	MSGERR		0x20		/* msgsys error */
+#define	PARITYERR	0x40		/* parity error */
+#define	BUSYERR		0x80		/* target busy error */
+#define	CMDREJECT	0x100		/* cmd reject error */
+#define	SCSI_LOW_ERRORBITS "\020\009cmdrej\008busy\007parity\006msgerr\005pdmaerr\004seltimeout\003timeout\002abort\001fatal"
+	u_int sl_error;				/* error flags */
+
+	/* current scsi data pointer */
+	struct sc_p sl_scp;
+
+	/* power control */
+	u_int sl_active;		/* host is busy state */
+	int sl_powc;			/* power down timer counter */
+	u_int sl_rstep;			/* resume step */
+
+	/* configuration flags */
+	u_int sl_flags;		
+#define	HW_POWDOWN	0x01
+#define	HW_RESUME	0x02
+#define	HW_PDMASTART	0x04
+#define	HW_INACTIVE	0x08
+#define	HW_POWERCTRL	0x10
+
+	u_int sl_cfgflags;
+#define	CFG_NODISC	0x01
+#define	CFG_NOPARITY	0x02
+#define	CFG_NOATTEN	0x04
+#define	CFG_ASYNC	0x08
+#define	CFG_MSGUNIFY	0x10
+
+	/* host informations */
+	u_int sl_hostid;
+	int sl_nluns;
+	int sl_ntargs;
+	int sl_openings;
+
+	/* interface functions */
+	struct scsi_low_funcs *sl_funcs;
+
+#if	defined(i386)
+	u_int sl_irq;		/* XXX */
+#endif	/* i386 */
+#ifdef __FreeBSD__
+	struct callout_handle engage_ch;
+	struct callout_handle timeout_ch;
+#ifdef	SCSI_LOW_POWFUNC
+	struct callout_handle recover_ch;
+#endif
+#endif /* __FreeBSD__ */
+};
+
+/*************************************************
+ * SCSI LOW service functions
+ *************************************************/
+/* 
+ * Scsi low attachment function.
+ */
+int scsi_low_attach __P((struct scsi_low_softc *, int, int, int, int));
+int scsi_low_dettach __P((struct scsi_low_softc *));
+
+/* 
+ * Scsi phase "bus service" functions.
+ * These functions are corresponding to each scsi bus phaeses.
+ */
+/* nexus abort (selection failed) */
+void scsi_low_clear_nexus __P((struct scsi_low_softc *, struct targ_info *));
+/* msgout phase */
+int scsi_low_msgout __P((struct scsi_low_softc *, struct targ_info *));
+/* msgin phase */
+void scsi_low_msgin __P((struct scsi_low_softc *, struct targ_info *, u_int8_t));
+/* data phase */
+int scsi_low_data __P((struct scsi_low_softc *, struct targ_info *, struct buf **, int));
+/* cmd phase */
+int scsi_low_cmd __P((struct scsi_low_softc *, struct targ_info *));
+
+/* reselection phase */
+struct targ_info *scsi_low_reselected __P((struct scsi_low_softc *, u_int));
+/* disconnection phase */
+int scsi_low_disconnected __P((struct scsi_low_softc *, struct targ_info *));
+
+/* 
+ * Scsi bus restart function.
+ * Canncel all established nexuses => scsi system initialized => restart jobs.
+ */
+#define	SCSI_LOW_RESTART_HARD	1
+#define	SCSI_LOW_RESTART_SOFT	0
+int scsi_low_restart __P((struct scsi_low_softc *, int, u_char *));
+
+/* 
+ * Scsi utility fucntions
+ */
+/* print current status */
+void scsi_low_print __P((struct scsi_low_softc *, struct targ_info *));
+/* timeout utility (only in used scsi_low_pisa) */
+void scsi_low_timeout __P((void *));
+#define	SCSI2_RESET_DELAY	5000000
+#define	TWIDDLEWAIT	10000
+/* bus reset utility */
+void scsi_low_bus_reset __P((struct scsi_low_softc *));
+
+/*************************************************
+ * Inline utility
+ *************************************************/
+static __inline u_int8_t scsi_low_identify __P((struct targ_info *ti));
+static __inline void scsi_low_attention __P((struct scsi_low_softc *, struct targ_info *));
+static __inline int scsi_low_is_msgout_continue __P((struct targ_info *));
+static __inline int scsi_low_assert_msg __P((struct scsi_low_softc *, struct targ_info *, u_int, int));
+static __inline void scsi_low_arbit_win __P((struct scsi_low_softc *, struct targ_info *));
+
+static __inline int
+scsi_low_is_msgout_continue(ti)
+	struct targ_info *ti;
+{
+	
+	return (ti->ti_msgflags != 0);
+}
+
+static __inline u_int8_t
+scsi_low_identify(ti)
+	struct targ_info *ti;
+{
+	u_int8_t msg;
+	struct lun_info *li = ti->ti_li;
+
+	msg = (li->li_flags & SCSI_LOW_DISC) ? 0xc0 : 0x80;
+	msg |= li->li_lun;
+	return msg;
+}
+
+#define	ID_MSG_SETUP(ti) (scsi_low_identify(ti))
+
+static __inline void
+scsi_low_attention(slp, ti)
+	struct scsi_low_softc *slp;
+	struct targ_info *ti;
+{
+
+	(*slp->sl_funcs->scsi_low_attention) (slp);
+	SCSI_LOW_TARGET_ASSERT_ATN(slp);
+}
+
+static __inline int
+scsi_low_assert_msg(slp, ti, msg, now)
+	struct scsi_low_softc *slp;
+	struct targ_info *ti;
+	u_int msg;
+	int now;
+{
+
+	ti->ti_msgflags |= msg;
+	if (now != 0)
+		scsi_low_attention(slp, ti);
+	return 0;
+}
+
+static __inline void
+scsi_low_arbit_win(slp, ti)
+	struct scsi_low_softc *slp;
+	struct targ_info *ti;
+{
+
+	slp->sl_selid = NULL;
+}
+
+/*************************************************
+ * Message out defs
+ *************************************************/
+/* XXX: use scsi_message.h */
+#define	ST_GOOD		0x00
+#define	ST_CHKCOND	0x02
+#define	ST_MET		0x04
+#define	ST_BUSY		0x08
+#define	ST_INTERGOOD	0x10
+#define	ST_INTERMET	0x14
+#define	ST_CONFLICT	0x18
+#define	ST_QUEFULL	0x28
+
+#define	MSG_COMP	0x00
+#define	MSG_EXTEND	0x01
+
+#define	MKMSG_EXTEND(XLEN, XCODE) ((((u_int)(XLEN)) << NBBY) | ((u_int)(XCODE)))
+#define	MSG_EXTEND_MDPCODE	0x00
+#define	MSG_EXTEND_MDPLEN	0x05
+#define	MSG_EXTEND_SYNCHCODE	0x01
+#define	MSG_EXTEND_SYNCHLEN	0x03
+#define	MSG_EXTEND_WIDECODE	0x03
+#define	MSG_EXTEND_WIDELEN	0x02
+
+#define	MSG_SAVESP	0x02
+#define	MSG_RESTORESP	0x03
+#define	MSG_DISCON	0x04
+#define	MSG_I_ERROR	0x05
+#define	MSG_ABORT	0x06
+#define	MSG_REJECT	0x07
+#define	MSG_NOOP	0x08
+#define	MSG_PARITY	0x09
+#define	MSG_LCOMP	0x0a
+#define	MSG_LCOMP_F	0x0b
+#define	MSG_RESET	0x0c
+#ifdef __FreeBSD__
+#undef	MSG_IDENTIFY
+#endif
+#define	MSG_IDENTIFY	0x80
+
+#define	OS_DEPEND(s)	(s)
+#endif	/* !_SCSI_LOW_H_ */
diff --git a/sys/cam/scsi/scsi_low_pisa.c b/sys/cam/scsi/scsi_low_pisa.c
new file mode 100644
index 0000000..3c530cb
--- /dev/null
+++ b/sys/cam/scsi/scsi_low_pisa.c
@@ -0,0 +1,181 @@
+/*	$FreeBSD$	*/
+/*	$NecBSD: scsi_low_pisa.c,v 1.13 1998/11/26 14:26:11 honda Exp $	*/
+/*	$NetBSD$	*/
+
+/*
+ * [NetBSD for NEC PC-98 series]
+ *  Copyright (c) 1995, 1996, 1997, 1998
+ *	NetBSD/pc98 porting staff. All rights reserved.
+ *  Copyright (c) 1995, 1996, 1997, 1998
+ *	Naofumi HONDA. 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. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/disklabel.h>
+#if defined(__FreeBSD__) && __FreeBSD_version >= 500001
+#include <sys/bio.h>
+#endif
+#include <sys/buf.h>
+#include <sys/queue.h>
+#include <sys/malloc.h>
+#include <sys/device_port.h>
+#include <sys/errno.h>
+
+#include <vm/vm.h>
+
+#include <machine/bus.h>
+#ifdef __NetBSD__
+#include <machine/intr.h>
+#endif
+
+#ifdef __NetBSD__
+#include <dev/isa/isareg.h>
+#include <dev/isa/isavar.h>
+
+#include <dev/isa/pisaif.h>
+#endif
+
+#include <machine/dvcfg.h>
+
+#ifdef __NetBSD__
+#include <dev/scsipi/scsi_all.h>
+#include <dev/scsipi/scsipi_all.h>
+#include <dev/scsipi/scsiconf.h>
+#include <dev/scsipi/scsi_disk.h>
+
+#include <i386/Cbus/dev/scsi_low.h>
+#include <i386/Cbus/dev/scsi_low_pisa.h>
+
+#define	SCSIBUS_RESCAN
+#else
+#ifdef __FreeBSD__
+#include <i386/isa/isa_device.h>
+#include <i386/isa/icu.h>
+
+#include <cam/scsi/scsi_low.h>
+#include <cam/scsi/scsi_low_pisa.h>
+#endif
+#endif
+
+#ifdef __FreeBSD__
+int
+scsi_low_deactivate(struct scsi_low_softc *sc)
+{
+#else
+#ifdef __NetBSD__
+int
+scsi_low_deactivate(dh)
+	pisa_device_handle_t dh;
+{
+	struct scsi_low_softc *sc = PISA_DEV_SOFTC(dh);
+#endif
+#endif
+	sc->sl_flags |= HW_INACTIVE;
+
+#ifdef __NetBSD__
+#ifdef	SCSI_LOW_POWFUNC
+	untimeout(scsi_low_recover, sc);
+#endif	/* SCSI_LOW_POWFUNC */
+	untimeout(scsi_low_timeout, sc);
+#else
+#ifdef __FreeBSD__
+#ifdef	SCSI_LOW_POWFUNC
+	untimeout(scsi_low_recover, sc, sc->recover_ch);
+#endif	/* SCSI_LOW_POWFUNC */
+	untimeout(scsi_low_timeout, sc, sc->timeout_ch);
+#endif
+#endif
+
+	return 0;
+}
+
+#ifdef __FreeBSD__
+int
+scsi_low_activate(struct scsi_low_softc *sc, struct isa_device *dev)
+{
+#else
+#ifdef __NetBSD__
+int
+scsi_low_activate(dh)
+	pisa_device_handle_t dh;
+{
+	struct scsi_low_softc *sc = PISA_DEV_SOFTC(dh);
+	slot_device_res_t dr = PISA_RES_DR(dh);
+#endif
+#endif
+	int error;
+
+	sc->sl_flags &= ~HW_INACTIVE;
+#ifdef	__FreeBSD__
+	sc->sl_cfgflags = ((sc->sl_cfgflags << 16) | ((dev->id_flags) & 0xffff));
+#else	/* __NetBSD__ */
+	sc->sl_cfgflags = DVCFG_MKCFG(DVCFG_MAJOR(sc->sl_cfgflags), \
+				      DVCFG_MINOR(PISA_DR_DVCFG(dr)));
+	sc->sl_irq = PISA_DR_IRQ(dr);
+#endif
+
+	if ((error = scsi_low_restart(sc, SCSI_LOW_RESTART_HARD, NULL)) != 0)
+	{
+		sc->sl_flags |= HW_INACTIVE;
+		return error;
+	}
+
+#ifdef __FreeBSD__
+	sc->timeout_ch = 
+#endif
+	timeout(scsi_low_timeout, sc, SCSI_LOW_TIMEOUT_CHECK_INTERVAL * hz);
+	/* rescan the scsi bus */
+#ifdef	SCSIBUS_RESCAN
+	if (PISA_RES_EVENT(dh) == PISA_EVENT_INSERT &&
+	    sc->sl_start.tqh_first == NULL)
+		scsi_probe_busses((int) sc->sl_link.scsipi_scsi.scsibus, -1, -1);
+#endif
+	return 0;
+}
+
+#ifdef __NetBSD__
+int
+scsi_low_notify(dh, ev)
+	pisa_device_handle_t dh;
+	pisa_event_t ev;
+{
+	struct scsi_low_softc *sc = PISA_DEV_SOFTC(dh);
+
+	switch(ev)
+	{
+	case PISA_EVENT_QUERY_SUSPEND:
+		if (sc->sl_start.tqh_first != NULL)
+			return SD_EVENT_STATUS_BUSY;
+		break;
+
+	default:
+		break;
+	}
+	return 0;
+}
+#endif
diff --git a/sys/cam/scsi/scsi_low_pisa.h b/sys/cam/scsi/scsi_low_pisa.h
new file mode 100644
index 0000000..551465a
--- /dev/null
+++ b/sys/cam/scsi/scsi_low_pisa.h
@@ -0,0 +1,46 @@
+/*	$FreeBSD$	*/
+/*	$NecBSD: scsi_low_pisa.h,v 1.3 1999/04/15 01:35:57 kmatsuda Exp $	*/
+/*	$NetBSD$	*/
+
+/*
+ * [NetBSD for NEC PC-98 series]
+ *  Copyright (c) 1998
+ *	NetBSD/pc98 porting staff. 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. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ */
+
+#ifndef	_SCSI_LOW_PISA_H_
+#define	_SCSI_LOW_PISA_H_
+
+#ifdef __NetBSD__
+int scsi_low_activate __P((pisa_device_handle_t));
+int scsi_low_deactivate __P((pisa_device_handle_t));
+int scsi_low_notify __P((pisa_device_handle_t, pisa_event_t));
+#endif
+#ifdef __FreeBSD__
+int scsi_low_activate __P((struct scsi_low_softc *, struct isa_device *));
+int scsi_low_deactivate __P((struct scsi_low_softc *));
+#endif
+#endif	/* !_SCSI_LOW_PISA_H_ */