Manpage of CACHEFLUSH

CACHEFLUSH

Section: Linux Programmer's Manual (2)
Updated: 2015-02-21
Index
 

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 the contents of the indicated cache(s) for the user addresses in the range addrto (addr+nbytes-1). cachemay 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, errnowill indicate the error.  

ERRORS

EFAULT
Some or all of the address range addrto (addr+nbytes-1)is not accessible.
EINVAL
cacheis not one of ICACHE, DCACHE, or BCACHE(but see BUGS).
 

CONFORMING TO

Historically, this system calls 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.  

BUGS

Linux kernels older than version 2.6.11 ignore the addrand nbytesarguments, making this function fairly expensive. Therefore, the whole cache is always flushed.

This function is always behaving as if BCACHEhas been passed for the cacheargument and does not do any error checking on the cacheargument.


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
CONFORMING TO
Caveat
BUGS

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