170 lines
3.5 KiB
HTML
170 lines
3.5 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of CACHEFLUSH</TITLE>
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</HEAD><BODY>
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<H1>CACHEFLUSH</H1>
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Section: Linux Programmer's Manual (2)<BR>Updated: 2017-09-15<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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cacheflush - flush contents of instruction and/or data cache
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<PRE>
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<B>#include <<A HREF="file:///usr/include/asm/cachectl.h">asm/cachectl.h</A>></B>
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<B>int cacheflush(char *</B><I>addr</I><B>, int nbytes</B><I>, int cache</I><B>);</B>
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</PRE>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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<B>cacheflush</B>()
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flushes the contents of the indicated cache(s) for the
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user addresses in the range
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<I>addr</I>
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to
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<I>(addr+nbytes-1)</I>.
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<I>cache</I>
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may be one of:
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<DL COMPACT>
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<DT id="1"><B>ICACHE</B>
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<DD>
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Flush the instruction cache.
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<DT id="2"><B>DCACHE</B>
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<DD>
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Write back to memory and invalidate the affected valid cache lines.
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<DT id="3"><B>BCACHE</B>
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<DD>
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Same as
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<B>(ICACHE|DCACHE)</B>.
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</DL>
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<A NAME="lbAE"> </A>
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<H2>RETURN VALUE</H2>
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<B>cacheflush</B>()
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returns 0 on success or -1 on error.
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If errors are detected,
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<I>errno</I>
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will indicate the error.
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<A NAME="lbAF"> </A>
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<H2>ERRORS</H2>
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<DL COMPACT>
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<DT id="4"><B>EFAULT</B>
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<DD>
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Some or all of the address range
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<I>addr</I>
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to
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<I>(addr+nbytes-1)</I>
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is not accessible.
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<DT id="5"><B>EINVAL</B>
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<DD>
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<I>cache</I>
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is not one of
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<B>ICACHE</B>,
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<B>DCACHE</B>,
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or
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<B>BCACHE</B>
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(but see BUGS).
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</DL>
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<A NAME="lbAG"> </A>
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<H2>CONFORMING TO</H2>
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Historically, this system call was available on all MIPS UNIX variants
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including RISC/os, IRIX, Ultrix, NetBSD, OpenBSD, and FreeBSD
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(and also on some non-UNIX MIPS operating systems), so that
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the existence of this call in MIPS operating systems is a de-facto
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standard.
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<A NAME="lbAH"> </A>
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<H3>Caveat</H3>
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<B>cacheflush</B>()
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should not be used in programs intended to be portable.
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On Linux, this call first appeared on the MIPS architecture,
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but nowadays, Linux provides a
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<B>cacheflush</B>()
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system call on some other architectures, but with different arguments.
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<A NAME="lbAI"> </A>
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<H2>BUGS</H2>
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Linux kernels older than version 2.6.11 ignore the
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<I>addr</I>
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and
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<I>nbytes</I>
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arguments, making this function fairly expensive.
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Therefore, the whole cache is always flushed.
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<P>
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This function always behaves as if
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<B>BCACHE</B>
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has been passed for the
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<I>cache</I>
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argument and does not do any error checking on the
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<I>cache</I>
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argument.
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<A NAME="lbAJ"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="6"><A HREF="#lbAB">NAME</A><DD>
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<DT id="7"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="8"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="9"><A HREF="#lbAE">RETURN VALUE</A><DD>
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<DT id="10"><A HREF="#lbAF">ERRORS</A><DD>
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<DT id="11"><A HREF="#lbAG">CONFORMING TO</A><DD>
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<DL>
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<DT id="12"><A HREF="#lbAH">Caveat</A><DD>
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</DL>
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<DT id="13"><A HREF="#lbAI">BUGS</A><DD>
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<DT id="14"><A HREF="#lbAJ">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:32 GMT, March 31, 2021
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