2 .\" Copyright (c) 1998 Kenneth D. Merry.
3 .\" All rights reserved.
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28 .\" $FreeBSD: src/share/man/man4/xpt.4,v 1.3.2.7 2001/08/17 13:08:40 ru Exp $
35 .Nd CAM transport layer interface
41 driver provides a way for userland applications to issue certain CAM CCBs
46 driver allows direct access to the CAM subsystem, system administrators
47 should exercise caution when granting access to this driver. If used
48 improperly, this driver can allow userland applications to crash a machine
50 .Sh KERNEL CONFIGURATION
51 There is no kernel configuration required for the
53 driver. It is enabled when
55 support is enabled in the kernel. There is one instance of the xpt driver
56 per CAM transport layer instance. Since there is currently only one CAM
57 transport layer, there will only be one instance of this driver.
59 .Bl -tag -width 01234567890123
61 This ioctl takes certain kinds of CAM CCBs and passes them through to the
62 CAM transport layer for action. Only the following CCB types are
65 .Bl -tag -width XPT_DEV_MATCH -compact
76 The above CCBs are the only ones supported since it makes more sense to
77 send them through a generic passthrough device rather than a passthrough
78 device tied to a particular underlying
82 This ioctl takes an XPT_GDEVLIST CCB, and returns the passthrough device
83 corresponding to the device in question.
86 .Bl -tag -width /dev/xpt0 -compact
88 Character device node for the
100 The CAM transport layer driver first appeared in
103 .An Kenneth Merry Aq Mt ken@FreeBSD.org