kernel/arm: set PXN for user memory

* 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 <[email protected]> Reviewed-by: waddlesplash <[email protected]>
2022-09-02 16:24:08 +00:00
parent c0a7601219
commit 3d79cd3332
3 changed files with 7 additions and 8 deletions
@@ -38,6 +38,7 @@
 	// 31                                  10 9 8      5 432 10
 	// | page table address                  |0| domain |000|01|

+#define ARM_MMU_L1_FLAG_PXN				0x00000004

 // the domain is not used so and the ? is implementation specified... have not
 // found it in the cortex A8 reference... so I set t to 0