On 05/07/13 18:30, Gedare Bloom wrote:
On Fri, Jul 5, 2013 at 12:11 PM, Hesham Moustafa
<heshamelmat...@gmail.com> wrote:
>Hi,
>
>I am working on a use case for cortex-a9/realview BSP that deals with page
>tables and MMU. I need your help in gathering the required API and calls and
>any other details to implement the following case (if applicable) :
>
>1- A thread running on a core that updates the page table.
>2- On another core another thread is running and trying to update the page
>table.
>
>Is that use case possible, or disabling dispatches, MMU, and interrupts
>avoids that situation ?
>
I think this is a possible situation. I suppose right now the page
tables are statically initialized by a boot processor, but if you
enable dynamically modifying the page table, then you need to protect
that memory somehow. Probably with a spin lock.
Currently the cache and MMU support on the Cortex-A9 BSPs is broken,
e.g. it doesn't work on real hardware. We work on this issue, but it
will take a couple of weeks to get it fixed.
The MMU management on SMP will be hard. Please read the ARMv7 reference
manual carefully.
--
Sebastian Huber, embedded brains GmbH
Address : Dornierstr. 4, D-82178 Puchheim, Germany
Phone : +49 89 189 47 41-16
Fax : +49 89 189 47 41-09
E-Mail : sebastian.hu...@embedded-brains.de
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Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
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