[boot-wrapper PATCH v3 7/8] aarch64: Prepare for booting with EL2
From: Jaxson Han <hidden>
Date: 2021-05-25 06:30:17
Subsystem:
the rest · Maintainer:
Linus Torvalds
Prepare for allowing boot-wrapper to be entered in EL2. Detect current EL and set the corresponding EL registers. Signed-off-by: Jaxson Han <redacted> Reviewed-by: Andre Przywara <andre.przywara@arm.com> --- arch/aarch64/boot.S | 8 ++++++++ arch/aarch64/utils.S | 10 +++++++++- 2 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/arch/aarch64/boot.S b/arch/aarch64/boot.S
index 5600859..14fd9cf 100644
--- a/arch/aarch64/boot.S
+++ b/arch/aarch64/boot.S@@ -183,10 +183,18 @@ jump_kernel: */ bfi x4, x19, #5, #1 + mrs x5, CurrentEL + cmp x5, #CURRENTEL_EL2 + b.eq 1f + msr elr_el3, x19 msr spsr_el3, x4 eret +1: msr elr_el2, x19 + msr spsr_el2, x4 + eret + .ltorg .data
diff --git a/arch/aarch64/utils.S b/arch/aarch64/utils.S
index ae22ea7..94e9931 100644
--- a/arch/aarch64/utils.S
+++ b/arch/aarch64/utils.S@@ -37,10 +37,18 @@ find_logical_id: ret /* - * Setup EL3 vectors + * Setup EL3/EL2 vectors * x0: vector address */ setup_vector: + mrs x1, CurrentEL + cmp x1, #CURRENTEL_EL2 + b.eq 1f + msr VBAR_EL3, x0 isb ret + +1: msr VBAR_EL2, x0 + isb + ret
--
2.25.1
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel