site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com Yes. I suggest: <http://www.power.org/resources/downloads/PowerISA_Public.pdf> for more reading on what's privileged or not privileged. You also need: -- Terry _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.a... On Jun 1, 2007, at 11:54 AM, Raul Flores wrote: I would like to lock/invalidate/flush cache areas and or set other cpu registers on a 7447A processor (Apple G4 PowerBook) with OS X (Darwin) 10.4. Not sure how to proceed, as many of the commands are "supervisor mode". A simple example would be reading HID0 and HID1 registers. Trying to perform an "mfspr" command for any other than 1,8,or 9 results in an illegal exception, when executed from the user state. Any ideas on how to approach/implement this type of functionality from my software? It appears that the CHUD framework installs a KEXT to control the performance counter registers. Am I looking at the same type of implementation (KEXT) to have my user application query/modify some of the register settings? Control registers require that you be running in supervisor state to examine or modify. <http://www.freescale.com/files/microcontrollers/doc/user_guide/DEMO9RS08KA2U...

But I'm told on good authority that you will find that whatever you change, we will likely either crash or change it back to what it's supposed to be, instead of what you set it to. This email sent to site_archiver@lists.apple.com