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mem.4: Add CONFIG_STRICT_DEVMEM 

Since 2.6.26 the CONFIG_NONPROMISC_DEVMEM options limits the physical
addresses which can be accessed through /dev/mem.

Sources:
 - Changelog: http://kernelnewbies.org/Linux_2_6_26
 - Initial commit: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ae531c26c5c2a28ca1b35a75b39b3b256850f2c8
 - Rename of name: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d092633bff3b19faffc480fe9810805e7792a029

Signed-off-by: Elie De Brauwer <eliedebrauwer@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Elie De Brauwer 2015-01-02 14:11:38 +01:00 committed by Michael Kerrisk
parent 463f35e1c9
commit 639dfde82f
1 changed files with 8 additions and 1 deletions
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man4/mem.4
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@ -23,7 +23,7 @@
.\" %%%LICENSE_END
.\"
.\" Modified Sat Jul 24 16:59:10 1993 by Rik Faith (faith@cs.unc.edu)
.TH MEM 4 1992-11-21 "Linux" "Linux Programmer's Manual"
.TH MEM 4 2015-01-02 "Linux" "Linux Programmer's Manual"
.SH NAME
mem, kmem, port \- system memory, kernel memory and system ports
.SH DESCRIPTION
@ -40,6 +40,13 @@ References to nonexistent locations cause errors to be returned.
Examining and patching is likely to lead to unexpected results
when read-only or write-only bits are present.
.LP
Since 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.
.LP
It is typically created by:
.RS
.sp