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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | BUGS | COLOPHON |
CACHEFLUSH(2) Linux Programmer's Manual CACHEFLUSH(2)
cacheflush - flush contents of instruction and/or data cache
#include <asm/cachectl.h>
int cacheflush(char *addr, int nbytes, int cache);
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).
cacheflush() returns 0 on success or -1 on error. If errors are
detected, errno will indicate the error.
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 (but see BUGS).
Historically, this system call was available on all MIPS UNIX
variants including RISC/os, IRIX, Ultrix, NetBSD, OpenBSD, and
FreeBSD (and also on some non-UNIX MIPS operating systems), so that
the existence of this call in MIPS operating systems is a de-facto
standard.
Caveat
cacheflush() should not be used in programs intended to be portable.
On Linux, this call first appeared on the MIPS architecture, but
nowadays, Linux provides a cacheflush() system call on some other
architectures, but with different arguments.
Linux kernels older than version 2.6.11 ignore the addr and nbytes
arguments, making this function fairly expensive. Therefore, the
whole cache is always flushed.
This function always behaves as if BCACHE has been passed for the
cache argument and does not do any error checking on the cache
argument.
This page is part of release 4.12 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
Linux 2015-02-21 CACHEFLUSH(2)
Pages that refer to this page: syscalls(2)