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Annotation of 43BSDReno/share/man/man4/man4.hp300/mem.4, revision 1.1.1.1

1.1       root        1: .\" Copyright (c) 1990 Regents of the University of California.
                      2: .\" All rights reserved.  The Berkeley software License Agreement
                      3: .\" specifies the terms and conditions for redistribution.
                      4: .\"
                      5: .\"    @(#)mem.4       5.1 (Berkeley) 6/29/90
                      6: .\"
                      7: .TH MEM 4 "June 29, 1990"
                      8: .UC 7
                      9: .SH NAME
                     10: mem, kmem \- main memory
                     11: .SH DESCRIPTION
                     12: .lg
                     13: .I Mem
                     14: is a special file that is an image of the main memory
                     15: of the computer.
                     16: It may be used, for example, to examine
                     17: (and even to patch) the system.
                     18: .PP
                     19: Byte addresses in
                     20: .I mem
                     21: are interpreted as physical memory addresses.
                     22: References to non-existent locations cause errors to be returned.
                     23: On the HP300, the last byte of physical memory is always
                     24: 0xFFFFFFFF.
                     25: Hence, on an HP300 with 8Mb of memory, physical memory would
                     26: start at 0xFF800000.
                     27: .PP
                     28: The file
                     29: .I kmem
                     30: is the same as 
                     31: .I mem
                     32: except that kernel virtual memory
                     33: rather than physical memory is accessed.
                     34: Only kernel virtual addresses that are mapped to memory are allowed.
                     35: On the HP300, kernel virtual memory runs from 0 to about 0x2400000.
                     36: .SH FILES
                     37: /dev/mem
                     38: .br
                     39: /dev/kmem

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