2004-11-03 13:51:07 +00:00
|
|
|
.\" Written by Ralf Baechle (ralf@waldorf-gmbh.de),
|
|
|
|
|
.\" Copyright (c) 1994, 1995 Waldorf GMBH
|
|
|
|
|
.\"
|
|
|
|
|
.\" This is free documentation; you can redistribute it and/or
|
|
|
|
|
.\" modify it under the terms of the GNU General Public License as
|
|
|
|
|
.\" published by the Free Software Foundation; either version 2 of
|
|
|
|
|
.\" the License, or (at your option) any later version.
|
|
|
|
|
.\"
|
|
|
|
|
.\" The GNU General Public License's references to "object code"
|
|
|
|
|
.\" and "executables" are to be interpreted as the output of any
|
|
|
|
|
.\" document formatting or typesetting system, including
|
|
|
|
|
.\" intermediate and printed output.
|
|
|
|
|
.\"
|
|
|
|
|
.\" This manual is distributed in the hope that it will be useful,
|
|
|
|
|
.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
|
.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
|
|
.\" GNU General Public License for more details.
|
|
|
|
|
.\"
|
|
|
|
|
.\" You should have received a copy of the GNU General Public
|
|
|
|
|
.\" License along with this manual; if not, write to the Free
|
|
|
|
|
.\" Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111,
|
|
|
|
|
.\" USA.
|
|
|
|
|
.\"
|
2007-05-26 07:28:44 +00:00
|
|
|
.TH CACHEFLUSH 2 2007-05-26 "Linux" "Linux Programmer's Manual"
|
2004-11-03 13:51:07 +00:00
|
|
|
.SH NAME
|
|
|
|
|
cacheflush \- flush contents of instruction and/or data cache
|
|
|
|
|
.SH SYNOPSIS
|
|
|
|
|
.nf
|
|
|
|
|
.B #include <asm/cachectl.h>
|
|
|
|
|
.sp
|
|
|
|
|
.BI "int cacheflush(char *" addr ", int "nbytes ", int "cache );
|
|
|
|
|
.fi
|
|
|
|
|
.SH DESCRIPTION
|
2005-10-19 06:54:38 +00:00
|
|
|
.BR cacheflush ()
|
2007-06-21 22:55:04 +00:00
|
|
|
flushes the contents of the indicated cache(s) for the
|
2007-05-26 07:28:44 +00:00
|
|
|
user addresses in the range
|
|
|
|
|
.I addr
|
2007-06-21 22:55:04 +00:00
|
|
|
to
|
2007-05-26 07:28:44 +00:00
|
|
|
.IR (addr+nbytes-1) .
|
|
|
|
|
.IR cache
|
|
|
|
|
may be one of:
|
2004-11-03 13:51:07 +00:00
|
|
|
.TP
|
|
|
|
|
.B ICACHE
|
|
|
|
|
Flush the instruction cache.
|
|
|
|
|
.TP
|
|
|
|
|
.B DCACHE
|
|
|
|
|
Write back to memory and invalidate the affected valid cache lines.
|
|
|
|
|
.TP
|
|
|
|
|
.B BCACHE
|
2007-04-12 22:42:49 +00:00
|
|
|
Same as
|
2005-07-19 15:38:39 +00:00
|
|
|
.BR (ICACHE|DCACHE) .
|
2004-11-03 13:51:07 +00:00
|
|
|
.SH "RETURN VALUE"
|
2005-10-19 06:54:38 +00:00
|
|
|
.BR cacheflush ()
|
2007-04-12 22:42:49 +00:00
|
|
|
returns 0 on success or \-1 on error.
|
|
|
|
|
If errors are detected,
|
|
|
|
|
.I errno
|
|
|
|
|
will indicate the error.
|
2004-11-03 13:51:07 +00:00
|
|
|
.SH ERRORS
|
|
|
|
|
.TP
|
|
|
|
|
.B EFAULT
|
2007-06-21 22:55:04 +00:00
|
|
|
Some or all of the address range
|
2007-05-26 07:28:44 +00:00
|
|
|
.I addr
|
2007-06-21 22:55:04 +00:00
|
|
|
to
|
2007-05-26 07:28:44 +00:00
|
|
|
.I (addr+nbytes-1)
|
|
|
|
|
is not accessible.
|
2004-11-03 13:51:07 +00:00
|
|
|
.TP
|
|
|
|
|
.B EINVAL
|
2007-05-26 07:28:44 +00:00
|
|
|
.I cache
|
2007-06-21 22:55:04 +00:00
|
|
|
is not one of
|
2007-05-26 07:28:44 +00:00
|
|
|
.BR ICACHE ,
|
2007-06-21 22:55:04 +00:00
|
|
|
.BR DCACHE ,
|
|
|
|
|
or
|
2007-05-26 07:28:44 +00:00
|
|
|
.BR BCACHE .
|
|
|
|
|
.SH CONFORMING TO
|
|
|
|
|
This Linux-specific system call is only available on MIPS based systems.
|
2007-06-27 07:26:52 +00:00
|
|
|
.\" FIXME . This system call was only on MIPS back in 1.2 days, but
|
|
|
|
|
.\" by now it is on a number of other architectures (but not x86).
|
|
|
|
|
.\" Investigate the details and update this page.
|
2007-05-18 16:06:42 +00:00
|
|
|
It should not be used in programs intended to be portable.
|
2007-05-26 07:28:44 +00:00
|
|
|
.\" Irix 6.5 appears to have a cacheflush() syscall -- mtk
|
2004-11-03 13:51:07 +00:00
|
|
|
.SH BUGS
|
2007-04-12 22:42:49 +00:00
|
|
|
The current implementation ignores the
|
|
|
|
|
.I addr
|
|
|
|
|
and
|
|
|
|
|
.I nbytes
|
|
|
|
|
arguments.
|
2006-04-27 22:40:34 +00:00
|
|
|
Therefore, the whole cache is always flushed.
|
