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.\" $OpenBSD: cacheflush.3,v 1.1 2009/09/27 18:20:13 miod Exp $
.\"
.\" Copyright (c) 2009 Miodrag Vallat.
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: September 27 2009 $
.Dt CACHEFLUSH 3
.Os
.Sh NAME
.Nm cacheflush ,
.Nm _flush_cache
.Nd CPU cache synchronization functions
.Sh SYNOPSIS
.In machine/sysarch.h
.Ft int
.Fn cacheflush "void *addr" "int nbytes" "int cache"
.Ft int
.Fn _flush_cache "char *addr" "int nbytes" "int cache"
.Sh DESCRIPTION
.Fn cacheflush
allows a process to synchronize the contents of the processor caches with
main memory.
Since MIPS processors have separate instruction and data caches, this
function allows for dynamically generated code to run correctly.
.Pp
.Nm
operates on a contiguous memory range in the current process address space,
starting at address
.Fa addr
and
.Fa nbytes
bytes long.
The caches to be synchronized are specified in the
.Fa cache
argument with one of the following values:
.Pp
.Bl -tag -width "ICACHEXXX" -compact -offset ind
.It Dv ICACHE
synchronize the instruction cache
.It Dv DCACHE
synchronize the data cache
.It Dv BCACHE
synchronize both the instruction and data caches
.El
.Pp
.Nm _flush_cache
is an alias for the
.Nm cacheflush
function.
.Sh RETURN VALUES
Upon successful completion,
.Nm
returns zero.
Otherwise, a value of \-1 is returned and
.Va errno
is set to indicate the error.
.Sh ERRORS
.Nm
will fail if:
.Bl -tag -width Er
.It Bq Er EFAULT
The address range specified by
.Fa addr
and
.Fa nbytes
is not part of the process allocated address space.
.It Bq Er EINVAL
.Fa cache
is not valid.
.El
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