mem(7) [osf1 man page]

mem(7)							 Miscellaneous Information Manual						    mem(7)

NAME

       mem - physical memory interface

DESCRIPTION

       The mem character special device file provides access to physical main memory.

       Byte addresses in mem are equivalent to physical memory in RAM. References to I/O space addresses or to nonexistent RAM will return errors.
       Write accesses to console or PAL memory will also return errors.

RESTRICTIONS

       Because memory is read and written in aligned quadwords (eight contiguous bytes), writing fewer than all the bytes in an  aligned  quadword
       is a read-modify-write operation that is not protected against concurrent writes to the same quadword.

FILES

       /dev/mem

RELATED INFORMATION

       kmem(7) delim off

																	    mem(7)

MEM(4)							     Linux Programmer's Manual							    MEM(4)

NAME

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

DESCRIPTION

       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 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.

       It is typically created by:

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

       The file kmem is the same as mem, except that the kernel virtual memory rather than physical memory is accessed.

       It is typically created by:

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

       port is similar to mem, but the I/O ports are accessed.

       It is typically created by:

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

FILES

       /dev/mem
       /dev/kmem
       /dev/port

SEE ALSO

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

COLOPHON

       This page is part of release 3.25 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    1992-11-21								    MEM(4)