redhat man page for cacheflush

CACHEFLUSH(2)						     Linux Programmer's Manual						     CACHEFLUSH(2)

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 contents of indicated cache(s) for 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
       EINVAL cache parameter is not one of ICACHE, DCACHE, or BCACHE.

       EFAULT Some or all of the address range addr to (addr+nbytes-1) is not accessible.

BUGS
       The current implementation ignores the addr and nbytes parameters.  Therefore always the whole cache is flushed.

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

Linux 2.0.32							    1995-06-27							     CACHEFLUSH(2)