MEM

Section: Devices and Network Interfaces (4)
Updated: hp300
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BSD mandoc
 

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 manner as /dev/mem Only kernel virtual addresses that are currently mapped to memory are allowed.  

HP300

On the HP300 the last byte of physical memory is always 0xFFFFFFFF Therefore, on an HP300 with 8Mb of memory, physical memory would start at 0xFF800000 On the HP300 kernel virtual memory runs from 0 to about 0x2400000  

FILES

/dev/mem
/dev/kmem

 

HISTORY

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


 

Index

NAME
DESCRIPTION
HP300
FILES
HISTORY

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Time: 06:48:22 GMT, May 19, 2025