[RFC PATCH v1 02/30] ArmPkg: Add helper function to detect RME

["Sami Mujawar" <sami.mujawar@arm.com>]

Add helper function to check if the Realm Management
Extension (RME) is implemented by the hardware.

Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
---
 ArmPkg/Include/Chipset/AArch64.h           |  3 ++-
 ArmPkg/Include/Library/ArmLib.h            | 15 ++++++++++++++-
 ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c | 16 +++++++++++++++-
 3 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/ArmPkg/Include/Chipset/AArch64.h b/ArmPkg/Include/Chipset/AArch64.h
index bfd2859f51310993a42057a4c68604d492d8d7a8..47ef4d85656f1da32e3b924b18cf21ee83be8206 100644
--- a/ArmPkg/Include/Chipset/AArch64.h
+++ b/ArmPkg/Include/Chipset/AArch64.h
@@ -1,7 +1,7 @@
 /** @file
 
   Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
-  Copyright (c) 2011 - 2021, Arm Limited. All rights reserved.<BR>
+  Copyright (c) 2011 - 2023, Arm Limited. All rights reserved.<BR>
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
 
@@ -27,6 +27,7 @@
 // ID_AA64PFR0 - AArch64 Processor Feature Register 0 definitions
 #define AARCH64_PFR0_FP   (0xF << 16)
 #define AARCH64_PFR0_GIC  (0xF << 24)
+#define AARCH64_PFR0_RME  (0xFULL << 52)
 
 // SCR - Secure Configuration Register definitions
 #define SCR_NS   (1 << 0)
diff --git a/ArmPkg/Include/Library/ArmLib.h b/ArmPkg/Include/Library/ArmLib.h
index fb1ae57b35221b2e96bc6c671398c526a6813fa7..27a6070feaa68ad03f256bcd7c2be751fdaea6b0 100644
--- a/ArmPkg/Include/Library/ArmLib.h
+++ b/ArmPkg/Include/Library/ArmLib.h
@@ -1,7 +1,7 @@
 /** @file
 
   Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
-  Copyright (c) 2011 - 2016, ARM Ltd. All rights reserved.<BR>
+  Copyright (c) 2011 - 2023, Arm Limited. All rights reserved.<BR>
   Copyright (c) 2020 - 2021, NUVIA Inc. All rights reserved.<BR>
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
@@ -783,6 +783,19 @@ ArmHasSecurityExtensions (
   VOID
   );
 
+#else
+
+/** Checks if RME is implemented.
+
+   @retval TRUE  RME is implemented.
+   @retval FALSE RME is not implemented.
+**/
+BOOLEAN
+EFIAPI
+ArmHasRme (
+  VOID
+  );
+
 #endif // MDE_CPU_ARM
 
 #endif // ARM_LIB_H_
diff --git a/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c b/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c
index 7ab28e3e05fe77333b8f315f3754164c4cd30a39..0f36b090effeb9f3eec21177105704a001102fc6 100644
--- a/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c
+++ b/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c
@@ -1,7 +1,7 @@
 /** @file
 
   Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
-  Portions copyright (c) 2011 - 2014, ARM Ltd. All rights reserved.<BR>
+  Portions copyright (c) 2011 - 2023, Arm Limited. All rights reserved.<BR>
   Copyright (c) 2021, NUVIA Inc. All rights reserved.<BR>
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
@@ -104,3 +104,17 @@ ArmHasCcidx (
   Mmfr2 = ArmReadIdAA64Mmfr2 ();
   return (((Mmfr2 >> 20) & 0xF) == 1) ? TRUE : FALSE;
 }
+
+/** Checks if RME is implemented.
+
+   @retval TRUE  RME is implemented.
+   @retval FALSE RME is not implemented.
+**/
+BOOLEAN
+EFIAPI
+ArmHasRme (
+  VOID
+  )
+{
+  return ((ArmReadIdAA64Pfr0 () & AARCH64_PFR0_RME) != 0);
+}
-- 
'Guid(CE165669-3EF3-493F-B85D-6190EE5B9759)'