mem(4) - NetBSD Manual Pages

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MEM(4)              NetBSD/mac68k Kernel Interfaces Manual              MEM(4)


NAME

     mem, kmem -- main memory


DESCRIPTION

     The file /dev/mem is an interface to the physical memory of the computer.
     Byte offsets in this file are interpreted as physical memory addresses.
     Reading and writing this file is equivalent to reading and writing memory
     itself.  An error will be returned if an attempt is made to reference an
     offset outside of /dev/mem.

     Kernel virtual memory is accessed via the file /dev/kmem in the same man-
     ner as /dev/mem.  Only kernel virtual addresses that are currently mapped
     to memory are allowed.

     On the Macintosh, physical memory may be discontiguous; kernel virtual
     memory begins at 0x00000000.


FILES

     /dev/mem
     /dev/kmem


HISTORY

     The files mem and kmem appeared in Version 6 AT&T UNIX.

NetBSD 6.1.3                     June 8, 1997                     NetBSD 6.1.3