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arm64: enable Permission Indirection Extension (PIE)

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

Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20230606145859.697944-17-joey.gouly@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Joey Gouly 2023-06-06 15:58:55 +01:00 committed by Catalin Marinas
parent eeda243dfe
commit 9e9bb6ede0
1 changed files with 15 additions and 0 deletions
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15
arch/arm64/mm/proc.S
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@ -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
*/