If adding/removing to the domain of the current running
thread, we need to update the hardware MPU regions or else
the addition or removal would not be reflected to current
running thread.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
This adds a spinlock to make sure writing to hardware MPU
regions is atomic, and cannot be interrupted until all
regions are written to hardware.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
This adds a new function xtensa_mem_kernel_has_access() to
determine if a memory region can be accessed by kernel threads.
This allows checking for valid mapped memory before accessing
them to avoid relying on page faults to detect invalid access.
Also fixed an issue with arch_buffer_validate() on MPU where
it may return okay even if the incoming memory region has no
corresponding entry in the MPU table.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
This allows the SoC to have total control on what MPU ranges
to be programmed at boot. This overrides the generic ranges
in the architecture core code.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
