1MEM(4)                     Kernel Interfaces Manual                     MEM(4)
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NAME

6       mem, kmem  -  core memory
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DESCRIPTION

9       Mem  is  a special file that is an image of the core memory of the com‐
10       puter.  It may be used, for example, to examine, and even to patch  the
11       system.   Kmem  is  the  same  as mem except that kernel virtual memory
12       rather than physical memory is accessed.
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14       Byte addresses are interpreted as memory addresses.  References to non-
15       existent locations return errors.
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17       Examining and patching device registers is likely to lead to unexpected
18       results when read-only or write-only bits are present.
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20       On PDP11's, the I/O page begins at location 0160000 of  kmem  and  per-
21       process data for the current process begins at 0140000.
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FILES

24       /dev/mem, /dev/kmem
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BUGS

27       On PDP11's, memory files are accessed one byte at a time, an inapprori‐
28       ate method for some device registers.
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