1 files changed, 36 insertions, 0 deletions
diff --git a/roms/edk2/MdeModulePkg/Universal/CapsuleRuntimeDxe/Arm/CapsuleReset.c b/roms/edk2/MdeModulePkg/Universal/CapsuleRuntimeDxe/Arm/CapsuleReset.c
new file mode 100644
index 000000000..e05f14de6
--- /dev/null
+++ b/roms/edk2/MdeModulePkg/Universal/CapsuleRuntimeDxe/Arm/CapsuleReset.c
@@ -0,0 +1,36 @@
+/** @file
+  ARM implementation of architecture specific routines related to
+  PersistAcrossReset capsules
+
+  Copyright (c) 2018, Linaro, Ltd. All rights reserved.<BR>
+  Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include "CapsuleService.h"
+
+/**
+  Whether the platform supports capsules that persist across reset. Note that
+  some platforms only support such capsules at boot time.
+
+  @return TRUE  if a PersistAcrossReset capsule may be passed to UpdateCapsule()
+                at this time
+          FALSE otherwise
+**/
+BOOLEAN
+IsPersistAcrossResetCapsuleSupported (
+  VOID
+  )
+{
+  //
+  // ARM requires the capsule payload to be cleaned to the point of coherency
+  // (PoC), but only permits doing so using cache maintenance instructions that
+  // operate on virtual addresses. Since at runtime, we don't know the virtual
+  // addresses of the data structures that make up the scatter/gather list, we
+  // cannot perform the maintenance, and all we can do is give up.
+  //
+  return FeaturePcdGet (PcdSupportUpdateCapsuleReset) && !EfiAtRuntime ();
+}
+