183 lines
5.1 KiB
Groff
183 lines
5.1 KiB
Groff
.\" $FreeBSD$
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.\" Copyright (c) 1997
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.\" Stefan Esser <se@freebsd.org>. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\"
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd February 7, 1997
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.Dt PCICONF 8
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.Os FreeBSD
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.Sh NAME
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.Nm pciconf
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.Nd diagnostic utility for the PCI bus
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.Sh SYNOPSIS
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.Nm pciconf Fl l
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.Nm pciconf Fl a Ar selector
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.Nm pciconf Fl r Ar selector
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.Op Fl b | Fl h
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.Ar reg
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.Nm pciconf Fl w Ar selector
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.Op Fl b | Fl h
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.Ar reg value
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.Sh DESCRIPTION
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The
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.Em pciconf
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command provides a command line interface to the functionality provided by
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.Pa /dev/pci Ns 's
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.Xr ioctl 2
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interface.
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With the
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.Fl l
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option, it lists all devices found by the boot probe in the following format:
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.Bd -literal
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pci0:4:0: class=0x010000 card=0x00000000 chip=0x000f1000 rev=0x01 hdr=0x00
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pci0:5:0: class=0x000100 card=0x00000000 chip=0x88c15333 rev=0x00 hdr=0x00
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pci0:6:0: class=0x020000 card=0x00000000 chip=0x802910ec rev=0x00 hdr=0x00
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.Ed
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.Pp
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The first column gives the
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.Ar selector
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in a form which may directly be used for the other forms of the command.
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The second column is the class code, with the class byte printed as two
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hex digits, followed by the sub-class and the interface bytes.
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The third column gives the contents of the subvendorid register, introduced
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in revision 2.1 of the
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.Tn PCI
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standard. It is 0 for most current (2.0)
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.Tn PCI
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cards, but is supposed to be loaded with a unique card identification code
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in newly developed
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.Tn PCI
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cards. The field consists of the card ID in the upper
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half and the card vendor ID in the lower half of the value.
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.Pp
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The fourth column contains the chip device ID, which identifies the chip
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this card is based on. It consists of two fields, identifying the chip and
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its vendor, as above.
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The fifth column prints the chip's revision.
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The sixth column describes the header type.
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Currently assigned header types are 0 for all devices except
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.Tn PCI
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to
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.Tn PCI
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bridges, and 1 for such bridge chips. If the most significant bit
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of the header type register is set for
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function 0 of a
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.Tn PCI
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device, it is a
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.Em multi-function
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device, which contains several (similar or independent) functions on
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one chip.
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.Pp
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The
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.Fl l
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option is the only one available to non-root users.
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All other invocations of
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.Nm pciconf
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require a
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.Ar selector
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of the form
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.Li pci Ns Va bus Ns \&: Ns Va device
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(optionally followed by
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.Li \&: Ns Va function ) .
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A final colon may be appended and
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will be ignored; this is so that the first column in the output of
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.Nm pciconf
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.Fl l
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can be used without modification. All numbers are base 10.
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.Pp
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With the
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.Fl a
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flag,
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.Nm pciconf
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determines whether any driver has been assigned to the device
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identified by
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.Ar selector .
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An exit status of zero indicates that the device has a driver;
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non-zero indicates that it does not.
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.Pp
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The
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.Fl r
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option reads a configuration space register at byte offset
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.Ar reg
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of device
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.Ar selector
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and prints out its value in hexadecimal.
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The
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.Fl w
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option writes the
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.Ar value
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into a configuration space register at byte offset
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.Ar reg
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of device
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.Ar selector .
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For both operations, the flags
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.Fl b
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and
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.Fl h
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select the width of the operation;
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.Fl b
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indicates a byte operation, and
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.Fl h
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indicates a halfword (two-byte) operation. The default is to read or
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write a longword (four bytes).
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.Sh SEE ALSO
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.Xr ioctl 2 ,
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.\" .Xr pci 4 ,
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.Xr modload 8
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.Sh HISTORY
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The
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.Nm pciconf
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command appeared first in
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.Fx 2.2 .
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The
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.Fl a
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option was added for
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.Tn PCI
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LKM support in
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.Fx 3.0 .
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.Sh AUTHORS
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The
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.Nm
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facility was written by Stefan Esser and Garrett Wollman.
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.Sh BUGS
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The
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.Fl b
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and
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.Fl h
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options are implemented in
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.Nm pciconf ,
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but not in the underlying
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.Fn ioctl .
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.Pp
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It might be useful to give non-root users access to the
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.Fl a
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and
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.Fl r
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options. But only root will be able to execute a
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.Nm modload
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to provide the device with a driver LKM, and reading of configuration space
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registers may cause a failure in badly designed
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.Tn PCI
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chips.
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