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cacheflush.html
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<!-- Creator : groff version 1.22.4 -->
<!-- CreationDate: Wed Jan 29 11:26:14 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">
p { margin-top: 0; margin-bottom: 0; vertical-align: top }
pre { margin-top: 0; margin-bottom: 0; vertical-align: top }
table { margin-top: 0; margin-bottom: 0; vertical-align: top }
h1 { text-align: center }
</style>
<title>CACHEFLUSH</title>
</head>
<body>
<h1 align="center">CACHEFLUSH</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="#BUGS">BUGS</a><br>
<a href="#COLOPHON">COLOPHON</a><br>
<hr>
<h2>NAME
<a name="NAME"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">cacheflush -
flush contents of instruction and/or data cache</p>
<h2>SYNOPSIS
<a name="SYNOPSIS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>#include
<asm/cachectl.h></b></p>
<p style="margin-left:11%; margin-top: 1em"><b>int
cacheflush(char *</b><i>addr</i><b>, int</b>
<i>nbytes</i><b>, int</b> <i>cache</i><b>);</b></p>
<h2>DESCRIPTION
<a name="DESCRIPTION"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>cacheflush</b>()
flushes the contents of the indicated cache(s) for the user
addresses in the range <i>addr</i> to
<i>(addr+nbytes-1)</i>. <i>cache</i> may be one of:</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="9%">
<p><b>ICACHE</b></p></td>
<td width="2%"></td>
<td width="78%">
<p>Flush the instruction cache.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="9%">
<p><b>DCACHE</b></p></td>
<td width="2%"></td>
<td width="78%">
<p>Write back to memory and invalidate the affected valid
cache lines.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="9%">
<p><b>BCACHE</b></p></td>
<td width="2%"></td>
<td width="78%">
<p>Same as <b>(ICACHE|DCACHE)</b>.</p></td></tr>
</table>
<h2>RETURN VALUE
<a name="RETURN VALUE"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>cacheflush</b>()
returns 0 on success or -1 on error. If errors are detected,
<i>errno</i> will indicate the error.</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>EFAULT</b></p></td>
<td width="2%"></td>
<td width="78%">
<p style="margin-top: 1em">Some or all of the address range
<i>addr</i> to <i>(addr+nbytes-1)</i> is not accessible.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="9%">
<p><b>EINVAL</b></p></td>
<td width="2%"></td>
<td width="78%">
<p><i>cache</i> is not one of <b>ICACHE</b>, <b>DCACHE</b>,
or <b>BCACHE</b> (but see BUGS).</p></td></tr>
</table>
<h2>CONFORMING TO
<a name="CONFORMING TO"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">Historically,
this system call was available on all MIPS UNIX variants
including RISC/os, IRIX, Ultrix, NetBSD, OpenBSD, and
FreeBSD (and also on some non-UNIX MIPS operating systems),
so that the existence of this call in MIPS operating systems
is a de-facto standard.</p>
<p style="margin-left:11%; margin-top: 1em"><b>Caveat <br>
cacheflush</b>() should not be used in programs intended to
be portable. On Linux, this call first appeared on the MIPS
architecture, but nowadays, Linux provides a
<b>cacheflush</b>() system call on some other architectures,
but with different arguments.</p>
<h2>BUGS
<a name="BUGS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">Linux kernels
older than version 2.6.11 ignore the <i>addr</i> and
<i>nbytes</i> arguments, making this function fairly
expensive. Therefore, the whole cache is always flushed.</p>
<p style="margin-left:11%; margin-top: 1em">This function
always behaves as if <b>BCACHE</b> has been passed for the
<i>cache</i> argument and does not do any error checking on
the <i>cache</i> argument.</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>