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Sample for CP15 C0

Jeff Kirkham
Note: This was originally posted on 30th March 2011 at http://forums.arm.com

I can't see how to use CP 15 various registers. Does anyone have a snippet that retrieves the implementer or perhaps the cache info from the CPU using CP15?
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  • Arm Employee Badge
    Note: This was originally posted on 15th April 2011 at http://forums.arm.com

    Correct - cache setup and maintenance operations are only available from  privileged mode.

    What are you actually trying to do in user space that needs this information? Cache line length is important to know if you are dealing with a hardware peripheral - but because a hardware device typically needs a privileged device driver, then adding a query to the driver to get the line length is the common method.
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  • Arm Employee Badge
    Note: This was originally posted on 15th April 2011 at http://forums.arm.com

    Correct - cache setup and maintenance operations are only available from  privileged mode.

    What are you actually trying to do in user space that needs this information? Cache line length is important to know if you are dealing with a hardware peripheral - but because a hardware device typically needs a privileged device driver, then adding a query to the driver to get the line length is the common method.
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