Ralf Baechle wrote:
> On Mon, Jan 08, 2001 at 04:07:31PM +0100, Maciej W. Rozycki wrote:
> > The only case caches need to be synchronized is modifying some code. The
> > ptrace syscall does it automatically for text writes -- it's needed and
> > used by gdb to set breakpoints, for example. For other code there is
> > cacheflush() which allows you to flush a cache range relevant to a given
> > virtual address (I see it's not implemented very well at the moment).
> > Obviously, you don't want to allow unprivileged users to flush caches as
> > a whole as it could lead to a DoS.
> You obviously want to allow partial cache flushes or trampolines don't work
> and flushing the entire cache can be constructed from that.
What we need is a mechanism to partial invalidate the I-cache and a mechanism
to write-back and/or invalidate the D-cache.
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