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From: "PierreGondois" <pierre.gondois@arm.com>
To: devel@edk2.groups.io
Cc: Sami Mujawar <sami.mujawar@arm.com>,
	Leif Lindholm <quic_llindhol@quicinc.com>,
	Ard Biesheuvel <ardb+tianocore@kernel.org>,
	Rebecca Cran <rebecca@bsdio.com>,
	Michael D Kinney <michael.d.kinney@intel.com>,
	Liming Gao <gaoliming@byosoft.com.cn>,
	Edward Pickup <Edward.Pickup@arm.com>
Subject: [PATCH RESEND v1 3/7] ArmPkg/ArmLib: Add ArmReadIdIsaR5() helper
Date: Wed, 29 Jun 2022 21:13:51 +0200
Message-Id: <20220629191355.2618844-4-Pierre.Gondois@arm.com>
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From: Pierre Gondois <Pierre.Gondois@arm.com>

Add a ArmReadIdIsaR5() helper function to access the AArch32
ID_ISAR5 register.

Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
---
 ArmPkg/Library/ArmLib/Arm/ArmLibSupport.S |  7 ++++++-
 ArmPkg/Library/ArmLib/Arm/ArmV7Lib.h      | 11 +++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/ArmPkg/Library/ArmLib/Arm/ArmLibSupport.S b/ArmPkg/Library/A=
rmLib/Arm/ArmLibSupport.S
index 0856740e3290..bc2be5331c7d 100644
--- a/ArmPkg/Library/ArmLib/Arm/ArmLibSupport.S
+++ b/ArmPkg/Library/ArmLib/Arm/ArmLibSupport.S
@@ -1,7 +1,7 @@
 #-----------------------------------------------------------------------=
-------
 #
 # Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
-# Copyright (c) 2011 - 2016, ARM Limited. All rights reserved.
+# Copyright (c) 2011 - 2022, Arm Limited. All rights reserved.
 # Copyright (c) 2016, Linaro Limited. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-2-Clause-Patent
@@ -167,4 +167,9 @@ ASM_FUNC (ArmGetPhysicalAddressBits)
   movge   r0, #40                 // 40 bits if LPAE
   bx      lr
=20
+// UINTN ArmReadIdIsaR5(VOID)
+ASM_FUNC(ArmReadIdIsaR5)
+  mrc     p15, 0, r0, c0, c2, 5
+  bx      lr
+
 ASM_FUNCTION_REMOVE_IF_UNREFERENCED
diff --git a/ArmPkg/Library/ArmLib/Arm/ArmV7Lib.h b/ArmPkg/Library/ArmLib=
/Arm/ArmV7Lib.h
index 404ff92c4e06..1cfd6e5f65ac 100644
--- a/ArmPkg/Library/ArmLib/Arm/ArmV7Lib.h
+++ b/ArmPkg/Library/ArmLib/Arm/ArmV7Lib.h
@@ -1,6 +1,7 @@
 /** @file
=20
   Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
+  Copyright (c) 2022, Arm Ltd. All rights reserved.<BR>
=20
   SPDX-License-Identifier: BSD-2-Clause-Patent
=20
@@ -66,4 +67,14 @@ ArmReadIdPfr1 (
   VOID
   );
=20
+/** Reads the ID_ISAR5 register.
+
+   @return The contents of the ID_ISAR5 register.
+**/
+UINTN
+EFIAPI
+ArmReadIdIsaR5 (
+  VOID
+  );
+
 #endif // ARM_V7_LIB_H_
--=20
2.25.1