kmem (4)

NAME

mem, kmem, port - system memory, kernel memory and system ports

DESCRIPTION

/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.
Byte addresses in /dev/mem are interpreted as physical memory addresses. 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.
Since Linux 2.6.26, and depending on the architecture, the 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.
It is typically created by:

mknod -m 660 /dev/mem c 1 1
chown root:kmem /dev/mem

The file /dev/kmem is the same as /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 CONFIG_DEVKMEM kernel configuration option is enabled.
It is typically created by:

mknod -m 640 /dev/kmem c 1 2
chown root:kmem /dev/kmem

/dev/port is similar to /dev/mem, but the I/O ports are accessed.
It is typically created by:

mknod -m 660 /dev/port c 1 4
chown root:kmem /dev/port

FILES

/dev/mem
 
/dev/kmem
 
/dev/port

SEE ALSO

chown(1), mknod(1), ioperm(2)

Information

Source
Linux kernel
OS/version
Linux
Source updated
January 2, 2015
Page created
February 9, 2018
Page generated
March 5, 2018