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Annotation of 43BSDTahoe/man/man4/vax/mem.4, revision 1.1.1.1

1.1       root        1: .\" Copyright (c) 1980 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       6.2 (Berkeley) 5/16/86
                      6: .\"
                      7: .TH MEM 4 "May 16, 1986"
                      8: .UC 4
                      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: .PP
                     24: The file
                     25: .I kmem
                     26: is the same as 
                     27: .I mem
                     28: except that kernel virtual memory
                     29: rather than physical memory is accessed.
                     30: Only kernel virtual addresses that are mapped to memory are allowed.
                     31: The file
                     32: .I kUmem
                     33: also refers to kernel virtual memory,
                     34: but may be used to access areas mapped to UNIBUS address space
                     35: and other I/O areas.
                     36: It forces all accesses to use word (short integer) accesses.
                     37: Examining and patching device registers is likely
                     38: to lead to unexpected results when read-only or write-only
                     39: bits are present.
                     40: .PP
                     41: On VAX 11/780 the I/O space begins at physical address 20000000(16);
                     42: on an 11/750 I/O space addresses are of the form fxxxxx(16).
                     43: On all VAX'en
                     44: per-process data for the current process is UPAGES long, and ends at virtual
                     45: address 80000000(16).
                     46: .SH FILES
                     47: /dev/mem
                     48: .br
                     49: /dev/kmem
                     50: .br
                     51: /dev/kUmem

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