142 lines
3.9 KiB
Groff
142 lines
3.9 KiB
Groff
.\"
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.\" Copyright (c) 1994 Joerg Wunsch
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.\"
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.\" All rights reserved.
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.\"
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.\" This program is free software.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by Joerg Wunsch
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.\" 4. The name of the developer may not be used to endorse or promote
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.\" products derived from this software without specific prior written
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.\" permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\" -hm updated 31.12.94
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.\"
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.Dd December 31, 1994
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.Dt VGAIO 8
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.Os
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.Sh NAME
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.Nm vgaio
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.Nd perform input/output on a Video Graphics Array
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.Sh SYNOPSIS
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.Nm
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.Op Fl d
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.Sh DESCRIPTION
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.Ss Purpose
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The
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.Nm
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utility
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is used to perform register-level input/output on a Video Graphics Array.
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Since some of the sequences required to access those registers are very
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silly,
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.Nm
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cares of all the things necessary and allows the user to access the
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registers of several register groups with their symbolic names.
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.Ss Options
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.Bl -tag -width 10n -offset indent
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.It Fl d
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Turn on the grammar parser debugger.
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.El
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.Ss Command language
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The command language of
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.Nm
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constitutes of some very simple tokens and rules.
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Commands are executed
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line by line as they are entered.
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Each line may contain any number of
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semicolon-separated input/output commands.
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.Pp
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Symbolic register names look like:
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.Pp
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.D1 Ao Em reggroup Ac Ns Aq Em regnumber
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.Pp
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with
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.Aq Em regnumber
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being any hexadecimal number
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(without a leading
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.Em 0x ) ,
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and
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.Aq Em reggroup
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one of the strings
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.Dq Em ar ,
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.Dq Em cr ,
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.Dq Em gr ,
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.Dq Em mi ,
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or
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.Dq Em sr ,
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standing for the
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.Em Attribute controller ,
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.Em CRT controller ,
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.Em Graphics controller ,
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.Em Miscellaneous Output Register ,
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or
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.Em Timing sequencer ,
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respectively.
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.Pp
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An input instruction has the form
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.Pp
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.D1 Ao Em regname Ac \&?
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.Pp
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and will cause
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.Nm
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to output a line like
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.Bd -ragged -offset indent
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.Aq Em regname
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.No = 0x Ns Aq Em number
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.Ed
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.Pp
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An output instruction looks like
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.Bd -ragged -offset indent
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.Ao Em regname Ac =
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.Aq Em number
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.Ed
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.Pp
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Spaces or Tabs between the
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.Aq Em reggroup ,
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the
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.Aq Em regnumber ,
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or any of the other tokens are ignored.
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They are not required anyway.
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.Pp
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The
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.Dq Em mi
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needs a single unused argument to satisfy the syntax :-) (-hm).
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.Ss Access control
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The caller must have uid 0 in order to gain the required access to
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the IO registers.
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.Sh HISTORY
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This program is considered
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.Dq hackware .
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It has been developed in order to simplify the process of developing other
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software that needs to program the Video Graphics Array.
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.Pp
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Remember, to use this program, your kernel has to be compiled with XSERVER
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being defined!
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.Sh AUTHORS
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The program has been contributed by
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.An J\(:org Wunsch ,
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Dresden
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.Aq joerg_wunsch@uriah.sax.de .
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