Cacheflush Syscall

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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 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.