From 377324046335120aa47b686f5595db50d833c6eb Mon Sep 17 00:00:00 2001
From: ken <ken@FreeBSD.org>
Date: Mon, 12 Oct 1998 00:31:42 +0000
Subject: Add a man page for the transport layer driver.... my last commit blew
 up in the middle of adding this file...

---
 share/man/man4/xpt.4 | 104 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 share/man/man4/xpt.4

(limited to 'share/man/man4/xpt.4')

diff --git a/share/man/man4/xpt.4 b/share/man/man4/xpt.4
new file mode 100644
index 0000000..378619a
--- /dev/null
+++ b/share/man/man4/xpt.4
@@ -0,0 +1,104 @@
+.\"
+.\" Copyright (c) 1998 Kenneth D. Merry.
+.\" 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+.\"
+.\"	$Id$
+.\"
+.Dd October 10, 1998
+.Dt XPT 4
+.Os FreeBSD 3.0
+.Sh NAME
+.Nm xpt
+.Nd CAM transport layer interface
+.Sh SYNOPSIS
+None.
+.Sh DESCRIPTION
+The
+.Nm xpt
+driver provides a way for userland applications to issue certain CAM CCBs
+to the kernel. 
+.Pp
+Since the
+.Nm xpt
+driver allows direct access to the CAM subsystem, system administrators
+should exercise caution when granting access to this driver.  If used
+improperly, this driver can allow userland applications to crash a machine
+or cause data loss.
+.Sh KERNEL CONFIGURATION
+There is no kernel configuration required for the
+.Nm xpt
+driver.  It is enabled when
+.Tn SCSI
+support is enabled in the kernel.  There is one instance of the xpt driver
+per CAM transport layer instance.  Since there is currently only one CAM
+transport layer, there will only be one instance of this driver.
+.Sh IOCTLS
+.Bl -tag -width 01234567890123
+.It CAMIOCOMMAND
+This ioctl takes certain kinds of CAM CCBs and passes them through to the
+CAM transport layer for action.  Only the following CCB types are
+supported:
+.Pp
+.Bl -tag -width XPT_DEV_MATCH -compact
+.It XPT_SCAN_BUS
+.It XPT_RESET_BUS
+.It XPT_SCAN_LUN
+.It XPT_ENG_INQ
+.It XPT_ENG_EXEC
+.It XPT_DEBUG
+.It XPT_DEV_MATCH
+.El
+.Pp
+The above CCBs are the only ones supported since it makes more sense to
+send them through a generic passthrough device rather than a passthrough
+device tied to a particular underlying
+.Tn SCSI
+device.
+.It CAMGETPASSTHRU
+This ioctl takes an XPT_GDEVLIST CCB, and returns the passthrough device
+corresponding to the device in question.
+.El
+.Sh FILES
+.Bl -tag -width 01234567890 -compact
+.It Pa /dev/xpt0
+Character device node for the
+.Nm xpt
+driver. 
+.El
+.Sh DIAGNOSTICS
+None.
+.Sh SEE ALSO
+.Xr cam 3 ,
+.Xr pass 4 ,
+.Xr camcontrol 8 ,
+.Xr cam 9 ,
+.Xr ccb 9 ,
+.Xr xpt 9 ,
+.Sh HISTORY
+The CAM transport layer driver first appeared in
+.Fx 3.0 .
+.Sh AUTHORS
+.An Kenneth Merry Aq ken@FreeBSD.ORG
-- 
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