kmem(4) [ultrix man page]

kmem(4) 						     Kernel Interfaces Manual							   kmem(4)

Name
       kmem - virtual main memory image

Description
       The  special  file is an image of the virtual main memory of the computer.  It may be used, for example, to examine (and even to patch) the
       running system.

       Byte addresses in are interpreted as virtual memory addresses.  For VAXs, the per-process data  for  the  current  process  is  at  virtual
       address 7ffff000(16).

Restrictions
       The memory file is accessed one byte at a time.

Files
See Also
       MAKEDEV(8)

																	   kmem(4)

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 3.53 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)