[PATCH v4 11/21] ArmPkg/ArmLib: Add ArmHasRngExt()

["PierreGondois" <pierre.gondois@arm.com>]

From: Pierre Gondois <pierre.gondois@arm.com>

Add a ArmHasRngExt() to check for the FEAT_RNG extension.
Also add a mask for the RNDR bits.

Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
---
 ArmPkg/Include/Library/ArmLib.h            | 12 +++++++++++-
 ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c | 15 ++++++++++++++-
 ArmPkg/Library/ArmLib/AArch64/AArch64Lib.h |  2 ++
 ArmPkg/Library/ArmLib/Arm/ArmV7Lib.c       | 16 +++++++++++++++-
 4 files changed, 42 insertions(+), 3 deletions(-)

diff --git a/ArmPkg/Include/Library/ArmLib.h b/ArmPkg/Include/Library/ArmLib.h
index 6566deebdde2..8058634dbc53 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 - 2022, Arm Limited. All rights reserved.<BR>
   Copyright (c) 2020 - 2021, NUVIA Inc. All rights reserved.<BR>
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
@@ -769,6 +769,16 @@ ArmHasCcidx (
   VOID
   );
 
+/** Check if FEAT_RNG extension is available.
+
+  @retval TRUE if FEAT_RNG extension is available.
+  @retval FALSE otherwise.
+**/
+BOOLEAN
+ArmHasRngExt (
+  VOID
+  );
+
 #ifdef MDE_CPU_ARM
 ///
 /// AArch32-only ID Register Helper functions
diff --git a/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c b/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c
index 7ab28e3e05fe..124b28e16874 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 - 2022, Arm Limited. All rights reserved.<BR>
   Copyright (c) 2021, NUVIA Inc. All rights reserved.<BR>
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
@@ -104,3 +104,16 @@ ArmHasCcidx (
   Mmfr2 = ArmReadIdAA64Mmfr2 ();
   return (((Mmfr2 >> 20) & 0xF) == 1) ? TRUE : FALSE;
 }
+
+/** Check if FEAT_RNG extension is available.
+
+  @retval TRUE if FEAT_RNG extension is available.
+  @retval FALSE otherwise.
+**/
+BOOLEAN
+ArmHasRngExt (
+  VOID
+  )
+{
+  return ArmReadIdIsar0 () & ID_AA64ISAR0_EL1_RNDR_MASK;
+}
diff --git a/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.h b/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.h
index 105a52ee16fe..61a775ea27e8 100644
--- a/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.h
+++ b/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.h
@@ -11,6 +11,8 @@
 #ifndef AARCH64_LIB_H_
 #define AARCH64_LIB_H_
 
+#define ID_AA64ISAR0_EL1_RNDR_MASK  ((UINT64)0xF << 60U)
+
 typedef VOID (*AARCH64_CACHE_OPERATION)(
   UINTN
   );
diff --git a/ArmPkg/Library/ArmLib/Arm/ArmV7Lib.c b/ArmPkg/Library/ArmLib/Arm/ArmV7Lib.c
index 521d5be0de33..a4ec23c8f8d8 100644
--- a/ArmPkg/Library/ArmLib/Arm/ArmV7Lib.c
+++ b/ArmPkg/Library/ArmLib/Arm/ArmV7Lib.c
@@ -1,7 +1,7 @@
 /** @file
 
   Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
-  Copyright (c) 2011 - 2014, ARM Limited. All rights reserved.
+  Copyright (c) 2011 - 2022, Arm Limited. All rights reserved.
   Copyright (c) 2021, NUVIA Inc. All rights reserved.<BR>
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
@@ -119,3 +119,17 @@ ArmHasCcidx (
   Mmfr4 = ArmReadIdMmfr4 ();
   return (((Mmfr4 >> 24) & 0xF) == 1) ? TRUE : FALSE;
 }
+
+/** Check if FEAT_RNG extension is available.
+
+  @retval TRUE if FEAT_RNG extension is available.
+  @retval FALSE otherwise.
+**/
+BOOLEAN
+ArmHasRngExt (
+  VOID
+  )
+{
+  // Not supported.
+  return FALSE;
+}
-- 
2.25.1