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* set PXN for all page tables below KERNEL_BASE * also set PXN for physical page mapper PXN, Privileged execute-never When the PXN bit is 1, a Permission fault is generated if the processor is executing at PL1 and attempts to execute an instruction fetched from the corresponding memory region. Change-Id: I3056cbed151004ac9edfbc81ebeada328aeb603c Reviewed-on: https://review.haiku-os.org/c/haiku/+/5607 Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org> Reviewed-by: waddlesplash <waddlesplash@gmail.com>