On Mon, Jan 08, 2001 at 05:23:20PM +0100, Carsten Langgaard wrote:
> What we need is a mechanism to partial invalidate the I-cache and a mechanism
> to write-back and/or invalidate the D-cache.
There is this nice little man page which should even be installed on your
Linux/Inhell box:
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 27 June 95 1
