<?xml version="1.0" encoding="ISO8859-1"?>
<fpdoc-descriptions>
<!--  

   $Id$ 
   This file is part of the FPC documentation. 
   Copyright (C) 1997, by Michael Van Canneyt 
 
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   modify it under the terms of the GNU Library General Public License as 
   published by the Free Software Foundation; either version 2 of the 
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU 
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 -->
<package name="rtl">
<module name="x86">
<short>Intel X86 specific routines for unix platforms.</short>
<!-- \FPCexampledir{crtex} -->
<descr>
<p>
The <file>x86</file> unit contains some of the routines that were present in
the 1.0.X Linux unit, and which were Intel (PC) architecture specific.
</p>
<p>
These calls have been preserved for compatibility, but should be considered
deprecated: they are not portable and may not even work on future linux
versions.
</p>
</descr>

<element name="ReadPort">
<short>Read data from a PC port</short>
<descr>
<p>
<var>ReadPort</var> reads one Byte, Word or Longint from port <var>Port</var> into
<var>Value</var>.
</p>
<p>
Note that you need permission to read a port. This permission can be set by 
the root user with the <link id="FpIOPerm"/> call.
</p>
</descr>
<errors>
In case of an error (not enough permissions read this port), runtime 216 
(<em> Access Violation</em>) will occur.
</errors>
<seealso>
<link id="FpIOPerm"/>
<link id="ReadPortB"/>
<link id="ReadPortW"/>
<link id="ReadPortL"/>
<link id="WritePort"/>,
<link id="WritePortB"/>
<link id="WritePortL"/>
<link id="WritePortW"/>
</seealso>
</element>

<element name="ReadPortB">
<short>Read bytes from a PC port</short>
<descr>
<p>
The procedural form of <var>ReadPortB</var> reads <var>Count</var> bytes from port
<var>Port</var> and stores them in <var>Buf</var>. There must be enough memory
allocated at <var>Buf</var> to store <var>Count</var> bytes.
</p>
<p>
The functional form of <var>ReadPortB</var> reads 1 byte from port <var>B</var>
and returns the byte that was read.
</p>
<p>
Note that you need permission to read a port. This permission can be set by 
the root user with the <link id="FpIOPerm"/> call.
</p>
</descr>
<errors>
In case of an error (not enough permissions read this port), runtime 216 
(<em> Access Violation</em>) will occur.
</errors>
<seealso>
<link id="FpIOPerm"/>
<link id="ReadPort"/>
<link id="ReadPortW"/>
<link id="ReadPortL"/>
<link id="WritePort"/>,
<link id="WritePortB"/>
<link id="WritePortL"/>
<link id="WritePortW"/>
</seealso>
</element>

<element name="ReadPortL">
<short>Read longints from a PC port </short>
<descr>
<p>
The procedural form of <var>ReadPortL</var> reads <var>Count</var> longints from port
<var>Port</var> and stores them in <var>Buf</var>. There must be enough memory
allocated at <var>Buf</var> to store <var>Count</var> Longints.
</p>
<p>
The functional form of <var>ReadPortL</var> reads 1 longint from port <var>B</var>
and returns the longint that was read.
</p>
<p>
Note that you need permission to read a port. This permission can be set by 
the root user with the <link id="FpIOPerm"/> call.
</p>
</descr>
<errors>
In case of an error (not enough permissions read this port), runtime 216 
(<em> Access Violation</em>) will occur.
</errors>
<seealso>
<link id="FpIOPerm"/>
<link id="ReadPort"/>
<link id="ReadPortW"/>
<link id="ReadPortB"/>
<link id="WritePort"/>,
<link id="WritePortB"/>
<link id="WritePortL"/>
<link id="WritePortW"/>
</seealso>
</element>

<element name="ReadPortW">
<short>Read Words from a PC port</short>
<descr>
<p>
The procedural form of <var>ReadPortW</var> reads <var>Count</var> words from port
<var>Port</var> and stores them in <var>Buf</var>. There must be enough memory
allocated at <var>Buf</var> to store <var>Count</var> words.
</p>
<p>
The functional form of <var>ReadPortW</var> reads 1 word from port <var>B</var>
and returns the word that was read.
</p>
<p>
Note that you need permission to read a port. This permission can be set by 
the root user with the <link id="FpIOPerm"/> call.
</p>
</descr>
<errors>
In case of an error (not enough permissions read this port), runtime 216 
(<em> Access Violation</em>) will occur.
</errors>
<seealso>
<link id="FpIOPerm"/>
<link id="ReadPort"/>
<link id="ReadPortB"/>
<link id="ReadPortL"/>
<link id="WritePort"/>,
<link id="WritePortB"/>
<link id="WritePortL"/>
<link id="WritePortW"/>
</seealso>
</element>

<element name="WritePort">
<short>Write data to PC port</short>
<descr>
<p>
<var>WritePort</var> writes <var>Value</var> -- 1 byte, Word or longint -- 
to port <var>Port</var>.
</p>
<remark>
You need permission to write to a port. This permission can be set with root
permission with the <link id="FpIOPerm"/> call.
</remark>
</descr>
<errors>
In case of an error (not enough permissions to write to this port), runtime 216 
(<em> Access Violation</em>) will occur.
</errors>
<seealso>
<link id="FpIOPerm"/>
<link id="WritePortB"/>
<link id="WritePortL"/>
<link id="WritePortW"/>
<link id="ReadPortB"/>
<link id="ReadPortL"/>
<link id="ReadPortW"/>
</seealso>
</element>


<element name="WritePortB">
<short>Write byte to PC port</short>
<descr>
<p>
The first form of <var>WritePortB</var> writes 1 byte to port <var>Port</var>.
The second form writes <var>Count</var> bytes from <var>Buf</var> to port <var>Port</var>.
</p>
<remark>
You need permission to write to a port. This permission can be set with root
permission with the <link id="FpIOPerm"/> call.
</remark>
</descr>
<errors>
In case of an error (not enough permissions to write to this port), runtime 216 
(<em> Access Violation</em>) will occur.
</errors>
<seealso>
<link id="FpIOPerm"/>
<link id="WritePort"/>
<link id="WritePortL"/>
<link id="WritePortW"/>
<link id="ReadPortB"/>
<link id="ReadPortL"/>
<link id="ReadPortW"/>
</seealso>
</element>


<element name="WritePortL">
<short>Write longint to PC port.</short>
<descr>
<p>
The first form of <var>WritePortB</var> writes 1 byte to port <var>Port</var>.
The second form writes <var>Count</var> bytes from <var>Buf</var> to port <var>Port</var>.
</p>
<remark>
You need permission to write to a port. This permission can be set with root
permission with the <link id="FpIOPerm"/> call.
</remark>
</descr>
<errors>
In case of an error (not enough permissions to write to this port), runtime 216 
(<em> Access Violation</em>) will occur.
</errors>
<seealso>
<link id="FpIOPerm"/>
<link id="WritePort"/>
<link id="WritePortB"/>
<link id="WritePortW"/>
<link id="ReadPortB"/>
<link id="ReadPortL"/>
<link id="ReadPortW"/>
</seealso>
</element>


<element name="WritePortW">
<short>Write Word to PC port</short>
<descr>
<p>
The first form of <var>WritePortB</var> writes 1 byte to port <var>Port</var>.
The second form writes <var>Count</var> bytes from <var>Buf</var> to port <var>Port</var>.
</p>
<remark>
You need permission to write to a port. This permission can be set with root
permission with the <link id="FpIOPerm"/> call.
</remark>
</descr>
<errors>
In case of an error (not enough permissions to write to this port), runtime 216 
(<em> Access Violation</em>) will occur.
</errors>
<seealso>
<link id="FpIOPerm"/>
<link id="WritePort"/>
<link id="WritePortL"/>
<link id="WritePortB"/>
<link id="ReadPortB"/>
<link id="ReadPortL"/>
<link id="ReadPortW"/>
</seealso>
</element>

<element name="FpIOperm">
<short>Set permission on IO ports</short>
<descr>
<p>
<var>FpIOperm</var>
sets permissions on <var>Num</var> ports starting with port <var>From</var> to 
<var>Value</var>. The function returns zero if the call was successfull,
a nonzero value otherwise.
</p>
<p>
Note:
</p>
<ul>
<li> This works ONLY as root.</li>
<li> Only the first <var>0x03ff</var> ports can be set.</li>
<li> When doing a <link id="#rtl.baseunix.FpFork">FpFork</link>, the permissions are reset. 
When doing a <link id="#rtl.baseunix.FpExecve">FpExecVE</link> they are kept.</li>
</ul>
</descr>
<errors>
Extended error information can be retrieved with <link id="#rtl.baseunix.fpGetErrno">FpGetErrno</link>
</errors>
</element>

<element name="FpIoPL">
<short>Set I/O privilege level</short>
<descr>
<var>FpIoPL</var> sets the I/O privilige level. It is intended for
completeness only, one should normally not use it.
</descr>
</element>

</module>
</package>
</fpdoc-descriptions>
