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pciconfig_write.html
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<!-- Creator : groff version 1.22.4 -->
<!-- CreationDate: Wed Jan 29 11:27:12 2020 -->
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta name="generator" content="groff -Thtml, see www.gnu.org">
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<meta name="Content-Style" content="text/css">
<style type="text/css">
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table { margin-top: 0; margin-bottom: 0; vertical-align: top }
h1 { text-align: center }
</style>
<title>PCICONFIG_READ</title>
</head>
<body>
<h1 align="center">PCICONFIG_READ</h1>
<a href="#NAME">NAME</a><br>
<a href="#SYNOPSIS">SYNOPSIS</a><br>
<a href="#DESCRIPTION">DESCRIPTION</a><br>
<a href="#RETURN VALUE">RETURN VALUE</a><br>
<a href="#ERRORS">ERRORS</a><br>
<a href="#CONFORMING TO">CONFORMING TO</a><br>
<a href="#SEE ALSO">SEE ALSO</a><br>
<a href="#COLOPHON">COLOPHON</a><br>
<hr>
<h2>NAME
<a name="NAME"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">pciconfig_read,
pciconfig_write, pciconfig_iobase - pci device information
handling</p>
<h2>SYNOPSIS
<a name="SYNOPSIS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>#include
<pci.h></b></p>
<p style="margin-left:11%; margin-top: 1em"><b>int
pciconfig_read(unsigned long</b> <i>bus</i><b>, unsigned
long</b> <i>dfn</i><b>, <br>
unsigned long</b> <i>off</i><b>, unsigned long</b>
<i>len</i><b>, void *</b><i>buf</i><b>); <br>
int pciconfig_write(unsigned long</b> <i>bus</i><b>,
unsigned long</b> <i>dfn</i><b>, <br>
unsigned long</b> <i>off</i><b>, unsigned long</b>
<i>len</i><b>, void *</b><i>buf</i><b>); <br>
int pciconfig_iobase(long</b> <i>which</i><b>, unsigned
long</b> <i>bus</i><b>, <br>
unsigned long</b> <i>devfn</i><b>);</b></p>
<h2>DESCRIPTION
<a name="DESCRIPTION"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">Most of the
interaction with PCI devices is already handled by the
kernel PCI layer, and thus these calls should not normally
need to be accessed from user space. <b><br>
pciconfig_read</b>()</p>
<p style="margin-left:22%;">Reads to <i>buf</i> from device
<i>dev</i> at offset <i>off</i> value.</p>
<p style="margin-left:11%;"><b>pciconfig_write</b>()</p>
<p style="margin-left:22%;">Writes from <i>buf</i> to
device <i>dev</i> at offset <i>off</i> value.</p>
<p style="margin-left:11%;"><b>pciconfig_iobase</b>()</p>
<p style="margin-left:22%;">You pass it a bus/devfn pair
and get a physical address for either the memory offset (for
things like prep, this is 0xc0000000), the IO base for PIO
cycles, or the ISA holes if any.</p>
<h2>RETURN VALUE
<a name="RETURN VALUE"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>pciconfig_read</b>()</p>
<p style="margin-left:22%;">On success, zero is returned.
On error, -1 is returned and <i>errno</i> is set
appropriately.</p>
<p style="margin-left:11%;"><b>pciconfig_write</b>()</p>
<p style="margin-left:22%;">On success, zero is returned.
On error, -1 is returned and <i>errno</i> is set
appropriately.</p>
<p style="margin-left:11%;"><b>pciconfig_iobase</b>()</p>
<p style="margin-left:22%;">Returns information on
locations of various I/O regions in physical memory
according to the <i>which</i> value. Values for <i>which</i>
are: <b>IOBASE_BRIDGE_NUMBER</b>, <b>IOBASE_MEMORY</b>,
<b>IOBASE_IO</b>, <b>IOBASE_ISA_IO</b>,
<b>IOBASE_ISA_MEM</b>.</p>
<h2>ERRORS
<a name="ERRORS"></a>
</h2>
<table width="100%" border="0" rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="9%">
<p style="margin-top: 1em"><b>EINVAL</b></p></td>
<td width="2%"></td>
<td width="78%">
<p style="margin-top: 1em"><i>len</i> value is invalid.
This does not apply to <b>pciconfig_iobase</b>().</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="9%">
<p><b>EIO</b></p></td>
<td width="2%"></td>
<td width="78%">
<p>I/O error.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="9%">
<p><b>ENODEV</b></p></td>
<td width="2%"></td>
<td width="78%">
<p>For <b>pciconfig_iobase</b>(), "hose" value is
NULL. For the other calls, could not find a slot.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="9%">
<p><b>ENOSYS</b></p></td>
<td width="2%"></td>
<td width="78%">
<p>The system has not implemented these calls
(<b>CONFIG_PCI</b> not defined).</p></td></tr>
</table>
<p style="margin-left:11%;"><b>EOPNOTSUPP</b></p>
<p style="margin-left:22%;">This return value is valid only
for <b>pciconfig_iobase</b>(). It is returned if the value
for <i>which</i> is invalid.</p>
<table width="100%" border="0" rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>EPERM</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>User does not have the <b>CAP_SYS_ADMIN</b> capability.
This does not apply to <b>pciconfig_iobase</b>().</p></td></tr>
</table>
<h2>CONFORMING TO
<a name="CONFORMING TO"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">These calls are
Linux-specific, available since Linux 2.0.26/2.1.11.</p>
<h2>SEE ALSO
<a name="SEE ALSO"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>capabilities</b>(7)</p>
<h2>COLOPHON
<a name="COLOPHON"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">This page is
part of release 5.02 of the Linux <i>man-pages</i> project.
A description of the project, information about reporting
bugs, and the latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.</p>
<hr>
</body>
</html>