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cacheflush() - Unix, Linux System Call


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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:

TagDescription
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

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

BUGS

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

NOTE

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



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