mirror of https://github.com/mkerrisk/man-pages
71 lines
2.1 KiB
Groff
71 lines
2.1 KiB
Groff
.\" Written by Ralf Baechle (ralf@waldorf-gmbh.de),
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.\" Copyright (c) 1994, 1995 Waldorf GMBH
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.\"
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.\" This is free documentation; you can redistribute it and/or
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.\" modify it under the terms of the GNU General Public License as
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.\" published by the Free Software Foundation; either version 2 of
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.\" the License, or (at your option) any later version.
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.\"
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.\" The GNU General Public License's references to "object code"
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.\" and "executables" are to be interpreted as the output of any
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.\" document formatting or typesetting system, including
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.\" intermediate and printed output.
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.\"
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.\" This manual is distributed in the hope that it will be useful,
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.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
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.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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.\" GNU General Public License for more details.
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.\"
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.\" You should have received a copy of the GNU General Public
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.\" License along with this manual; if not, write to the Free
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.\" Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111,
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.\" USA.
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.\"
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.TH CACHEFLUSH 2 1995-06-27 "Linux 2.0.32" "Linux Programmer's Manual"
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.SH NAME
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cacheflush \- flush contents of instruction and/or data cache
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.SH SYNOPSIS
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.nf
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.B #include <asm/cachectl.h>
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.sp
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.BI "int cacheflush(char *" addr ", int "nbytes ", int "cache );
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.fi
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.SH DESCRIPTION
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.BR cacheflush ()
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flushes contents of indicated cache(s) for user addresses in the range
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addr to (addr+nbytes-1).
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Cache may be one of:
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.TP
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.B ICACHE
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Flush the instruction cache.
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.TP
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.B DCACHE
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Write back to memory and invalidate the affected valid cache lines.
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.TP
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.B BCACHE
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Same as
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.BR (ICACHE|DCACHE) .
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.SH "RETURN VALUE"
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.BR cacheflush ()
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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
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will indicate the error.
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.SH ERRORS
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.TP
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.B EFAULT
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Some or all of the address range addr to (addr+nbytes-1) is not accessible.
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.TP
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.B EINVAL
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cache parameter is not one of ICACHE, DCACHE, or BCACHE.
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.SH BUGS
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The current implementation ignores the
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.I addr
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and
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.I nbytes
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arguments.
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Therefore, the whole cache is always flushed.
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.SH NOTE
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This system call is only available on MIPS based systems.
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It should not be used in programs intended to be portable.
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