Manpage of CACHEFLUSH
CACHEFLUSHSection: Linux Programmer's Manual (2)
NAMEcacheflush - flush of instruction and/or data cache
#include <asm/cachectl.h>int cacheflush(char *addr, int nbytes, int cache);
DESCRIPTIONcacheflush() flushes the of the indicated cache(s) for the user addresses in the range addrto (addr+nbytes-1). cachemay be one of:
- Flush the instruction cache.
- Write back to memory and invalidate the affected valid cache lines.
- Same as (ICACHE|DCACHE).
RETURN VALUEcacheflush() returns 0 on success or -1 on error. If errors are detected, errnowill indicate the error.
- Some or all of the address range addrto (addr+nbytes-1)is not accessible.
- cacheis not one of ICACHE, DCACHE, or BCACHE(but see BUGS).
CONFORMING TOHistorically, 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.
Caveatcacheflush() 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.
BUGSLinux 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.
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