mem(4) - NetBSD Manual Pages

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MEM(4)               NetBSD/pc532 Kernel Interfaces Manual              MEM(4)


NAME

     mem, kmem - memory files


DESCRIPTION

     The special 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.  Only offsets within the bounds of /dev/mem are
     allowed.

     Kernel virtual memory is accessed through the interface /dev/kmem in the
     same manner as /dev/mem.  Only kernel virtual addresses that are cur-
     rently mapped to memory are allowed.

     On the pc532, physical memory is contiguous starting at address
     0x00000000, EPROM starts at 0x10000000, and devices start at 0x28000000.


FILES

     /dev/mem
     /dev/kmem


HISTORY

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

NetBSD 2.0                     December 23, 1995                    NetBSD 2.0