MirOS Manual: kmem(4), mem(4)

MEM(4)                  BSD Programmer's Manual (i386)                  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 al-
     lowed.

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

     On ISA the I/O memory space begins at physical address 0x000a0000 and
     runs to 0x00100000. The per-process data size for the current process is
     UPAGES long, and ends at virtual address 0xfe000000.

     Writeability of these devices is controlled by the system securelevel(7).

FILES

     /dev/mem
     /dev/kmem

SEE ALSO

     securelevel(7)

HISTORY

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

MirOS BSD #10-current            May 2, 1991                                 1

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