mem - phpMan

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  non-
       existent 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:mem /dev/mem


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

       It is typically created by:

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


       Port is similar to mem, but the IO 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)



Linux                                       1992-11-21                                     MEM(4)

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