Re: [PATCH] ArmPkg/Library: Add ArmReadSctlr for aarch64

Supreeth Venkatesh

Thanks Ard.

-----Original Message-----
From: Ard Biesheuvel []
Sent: Monday, August 01, 2016 7:11 AM
To: Supreeth Venkatesh
Cc: edk2-devel-01; Leif Lindholm; John Powell
Subject: Re: [PATCH] ArmPkg/Library: Add ArmReadSctlr for aarch64

On 30 July 2016 at 01:06, Supreeth Venkatesh <> wrote:
One of the UEFI Self Certification tests (UEFI-SCT) need to read the
current exception level SCTLR Register.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: John Powell <>
Signed-off-by: Supreeth Venkatesh <>
Thanks for the patch. I don't think mentioning the UEFI-SCT here makes any sense, since the function is defined in ArmLIb.h, and simply missing from the AARCH64 implementation.

I fixed this up when applying (07783fdd67e4)


ArmPkg/Library/ArmLib/Common/AArch64/ArmLibSupport.S | 12
1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/ArmPkg/Library/ArmLib/Common/AArch64/ArmLibSupport.S
index a6fd5e3..c9f3bd1 100644
--- a/ArmPkg/Library/ArmLib/Common/AArch64/ArmLibSupport.S
+++ b/ArmPkg/Library/ArmLib/Common/AArch64/ArmLibSupport.S
@@ -1,7 +1,7 @@

# Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR> -#
Copyright (c) 2011 - 2014, ARM Limited. All rights reserved.
+# Copyright (c) 2011 - 2016, ARM Limited. All rights reserved.
# This program and the accompanying materials # are licensed and
made available under the terms and conditions of the BSD License @@
+GCC_ASM_EXPORT (ArmReadSctlr)


@@ -205,4 +206,13 @@ ASM_PFX(ArmWriteCpuActlr):

+ EL1_OR_EL2_OR_EL3(x1)
+1:mrs x0, sctlr_el1
+ ret
+2:mrs x0, sctlr_el2
+ ret
+3:mrs x0, sctlr_el3
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