CACHEFLUSH

Section: Linux Programmer's Manual (2)
Updated: 2007-05-26
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NAME

cacheflush - flush contents of instruction and/or data cache

SYNOPSIS

#include <asm/cachectl.h>

int cacheflush(char *addr, int nbytes, int cache);

DESCRIPTION

cacheflush() flushes the contents of the indicated cache(s) for the user addresses in the range addr to (addr+nbytes-1). cache may be one of:

ICACHE: Flush the instruction cache.
DCACHE: Write back to memory and invalidate the affected valid cache lines.
BCACHE: Same as (ICACHE|DCACHE).

RETURN VALUE

cacheflush() returns 0 on success or -1 on error. If errors are detected, errno will indicate the error.

ERRORS

EFAULT: Some or all of the address range addr to (addr+nbytes-1) is not accessible.
EINVAL: cache is not one of ICACHE, DCACHE, or BCACHE.

CONFORMING TO

This Linux-specific system call is only available on MIPS based systems. It should not be used in programs intended to be portable.

BUGS

The current implementation ignores the addr and nbytes arguments. Therefore, the whole cache is always flushed.

COLOPHON

This page is part of release 3.22 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.