1 files changed, 35 insertions, 0 deletions
diff --git a/ArmPkg/Drivers/ArmGic/AArch64/ArmGicArchLib.c b/ArmPkg/Drivers/ArmGic/AArch64/ArmGicArchLib.c
new file mode 100644
index 0000000000..5a7837f43d
--- /dev/null
+++ b/ArmPkg/Drivers/ArmGic/AArch64/ArmGicArchLib.c
@@ -0,0 +1,35 @@
+/** @file
+*
+*  Copyright (c) 2014, 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 which accompanies this
+*  distribution.  The full text of the license may be found at
+*  http://opensource.org/licenses/bsd-license.php
+*
+*  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+*  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+*
+**/
+
+#include <Library/ArmLib.h>
+#include <Library/ArmGicLib.h>
+
+ARM_GIC_ARCH_REVISION
+EFIAPI
+ArmGicGetSupportedArchRevision (
+  VOID
+  )
+{
+  // Ideally we would like to use the GICC IIDR Architecture version here, but
+  // this does not seem to be very reliable as the implementation could easily
+  // get it wrong. It is more reliable to check if the GICv3 System Register
+  // feature is implemented on the CPU. This is also convenient as our GICv3
+  // driver requires SRE. If only Memory mapped access is available we try to
+  // drive the GIC as a v2.
+  if (ArmReadIdPfr0 () & AARCH64_PFR0_GIC) {
+    return ARM_GIC_ARCH_REVISION_3;
+  }
+
+  return ARM_GIC_ARCH_REVISION_2;
+}