MEM

Section: Devices and Network Interfaces (4)
Updated: i386
Index Return to Main Contents

BSD mandoc
 

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 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.  

FILES

/dev/mem
/dev/kmem

 

HISTORY

The mem kmem files appeared in AT&T System v6 .


 

Index

NAME
DESCRIPTION
FILES
HISTORY

This document was created by man2html, using the manual pages.
Time: 06:48:18 GMT, May 19, 2025