Commit 9e9bb6ed authored by Joey Gouly's avatar Joey Gouly Committed by Catalin Marinas
Browse files

arm64: enable Permission Indirection Extension (PIE) 



Now that the necessary changes have been made, set the Permission Indirection
registers and enable the Permission Indirection Extension.

Signed-off-by: default avatarJoey Gouly <joey.gouly@arm.com>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20230606145859.697944-17-joey.gouly@arm.com


Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent eeda243d

arch/arm64/mm/proc.S

+15 −0
Original line number Diff line number Diff line
@@ -454,6 +454,21 @@ SYM_FUNC_START(__cpu_setup) 
#endif	/* CONFIG_ARM64_HW_AFDBM */

	msr	mair_el1, mair

	msr	tcr_el1, tcr



	mrs_s	x1, SYS_ID_AA64MMFR3_EL1

	ubfx	x1, x1, #ID_AA64MMFR3_EL1_S1PIE_SHIFT, #4

	cbz	x1, .Lskip_indirection



	mov_q	x0, PIE_E0

	msr	REG_PIRE0_EL1, x0

	mov_q	x0, PIE_E1

	msr	REG_PIR_EL1, x0



	mov	x0, TCR2_EL1x_PIE

	msr	REG_TCR2_EL1, x0



.Lskip_indirection:



	/*

	 * Prepare SCTLR

	 */