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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-24 04:52:22 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-24 04:52:22 +0000
commit3d08cd331c1adcf0d917392f7e527b3f00511748 (patch)
tree312f0d1e1632f48862f044b8bb87e602dcffb5f9 /man4/mem.4
parentAdding debian version 6.7-2. (diff)
downloadmanpages-3d08cd331c1adcf0d917392f7e527b3f00511748.tar.xz
manpages-3d08cd331c1adcf0d917392f7e527b3f00511748.zip
Merging upstream version 6.8.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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-.\" Copyright (c) 1993 Michael Haardt (michael@moria.de),
-.\" Fri Apr 2 11:32:09 MET DST 1993
-.\"
-.\" SPDX-License-Identifier: GPL-2.0-or-later
-.\"
-.\" Modified Sat Jul 24 16:59:10 1993 by Rik Faith (faith@cs.unc.edu)
-.TH mem 4 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-mem, kmem, port \- system memory, kernel memory and system ports
-.SH DESCRIPTION
-.I /dev/mem
-is a character device file
-that is an image of the main memory of the computer.
-It may be used, for example, to examine (and even patch) the system.
-.P
-Byte addresses in
-.I /dev/mem
-are interpreted as physical memory addresses.
-References to nonexistent locations cause errors to be returned.
-.P
-Examining and patching is likely to lead to unexpected results
-when read-only or write-only bits are present.
-.P
-Since Linux 2.6.26, and depending on the architecture, the
-.B CONFIG_STRICT_DEVMEM
-kernel configuration option limits the areas
-which can be accessed through this file.
-For example: on x86, RAM access is not allowed but accessing
-memory-mapped PCI regions is.
-.P
-It is typically created by:
-.P
-.in +4n
-.EX
-mknod \-m 660 /dev/mem c 1 1
-chown root:kmem /dev/mem
-.EE
-.in
-.P
-The file
-.I /dev/kmem
-is the same as
-.IR /dev/mem ,
-except that the kernel virtual memory
-rather than physical memory is accessed.
-Since Linux 2.6.26, this file is available only if the
-.B CONFIG_DEVKMEM
-kernel configuration option is enabled.
-.P
-It is typically created by:
-.P
-.in +4n
-.EX
-mknod \-m 640 /dev/kmem c 1 2
-chown root:kmem /dev/kmem
-.EE
-.in
-.P
-.I /dev/port
-is similar to
-.IR /dev/mem ,
-but the I/O ports are accessed.
-.P
-It is typically created by:
-.P
-.in +4n
-.EX
-mknod \-m 660 /dev/port c 1 4
-chown root:kmem /dev/port
-.EE
-.in
-.SH FILES
-.I /dev/mem
-.br
-.I /dev/kmem
-.br
-.I /dev/port
-.SH SEE ALSO
-.BR chown (1),
-.BR mknod (1),
-.BR ioperm (2)