Invalidate Data Cache from User Space

[Josh Boyer]

On Mon, Nov 09, 2009 at 11:10:42AM -0700, Jonathan Haws wrote:
>All,
>What is happening is the dcbi instruction will fail.  I get an Illegal Instruction message on the console and my program exits.
>
>Is there a reason I cannot call dbci from a user space application, or is there something wrong in my code?  Even better, is there a working and tested function that I can call from user space to invalidate a portion of the data cache?

dcbi is a priviledged instruction on 4xx.  You can only execute it from
supervisor mode (kernel).

josh