[edk2-devel] [PATCH v2 01/45] 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.

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Leif Lindholm <quic_llindhol@quicinc.com>
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 5390bf0a2774fb410f33e031cb0367708905c658..33f8df12637b7003b46458ae0680f67ebc3a431a 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
 
@@ -30,6 +30,7 @@
 // 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)
 
 // ID_AA64DFR0 - AArch64 Debug Feature Register 0 definitions
 #define AARCH64_DFR0_TRACEVER  (0xFULL << 4)
diff --git a/ArmPkg/Include/Library/ArmLib.h b/ArmPkg/Include/Library/ArmLib.h
index 6aa8a48f07f39255b70406774d2d803dbfc97b0b..ed876d231bbe82a1655e7455d04c92042aab3a94 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
@@ -824,6 +824,19 @@ 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 87285465871dc100ea0065659959ca845912c549..8952524fb3d56695cce181f852723d8b2a1dc77c 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
@@ -150,3 +150,17 @@ ArmHasEte (
   // The ID_AA64DFR0_EL1.TraceVer field identifies the presence of FEAT_ETE.
   return ((ArmReadIdAA64Dfr0 () & AARCH64_DFR0_TRACEVER) != 0);
 }
+
+/** 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)'



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