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