1 files changed, 57 insertions, 0 deletions
diff --git a/src/VBox/Devices/EFI/Firmware/MdeModulePkg/Universal/CapsuleRuntimeDxe/CapsuleCache.c b/src/VBox/Devices/EFI/Firmware/MdeModulePkg/Universal/CapsuleRuntimeDxe/CapsuleCache.c
new file mode 100644
index 00000000..f59d1fb2
--- /dev/null
+++ b/src/VBox/Devices/EFI/Firmware/MdeModulePkg/Universal/CapsuleRuntimeDxe/CapsuleCache.c
@@ -0,0 +1,57 @@
+/** @file
+  Flush the cache is required for most architectures while do capsule
+  update. It is not support at Runtime.
+
+  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"
+
+#include <Library/CacheMaintenanceLib.h>
+
+/**
+  Writes Back a range of data cache lines covering a set of capsules in memory.
+
+  Writes Back the data cache lines specified by ScatterGatherList.
+
+  @param  ScatterGatherList Physical address of the data structure that
+                            describes a set of capsules in memory
+
+**/
+VOID
+CapsuleCacheWriteBack (
+  IN  EFI_PHYSICAL_ADDRESS    ScatterGatherList
+  )
+{
+  EFI_CAPSULE_BLOCK_DESCRIPTOR    *Desc;
+
+  if (!EfiAtRuntime ()) {
+    Desc = (EFI_CAPSULE_BLOCK_DESCRIPTOR *)(UINTN)ScatterGatherList;
+    do {
+      WriteBackDataCacheRange (
+        (VOID *)(UINTN)Desc,
+        (UINTN)sizeof (*Desc)
+        );
+
+      if (Desc->Length > 0) {
+        WriteBackDataCacheRange (
+          (VOID *)(UINTN)Desc->Union.DataBlock,
+          (UINTN)Desc->Length
+          );
+        Desc++;
+      } else if (Desc->Union.ContinuationPointer > 0) {
+        Desc = (EFI_CAPSULE_BLOCK_DESCRIPTOR *)(UINTN)Desc->Union.ContinuationPointer;
+      }
+    } while (Desc->Length > 0 || Desc->Union.ContinuationPointer > 0);
+
+    WriteBackDataCacheRange (
+      (VOID *)(UINTN)Desc,
+      (UINTN)sizeof (*Desc)
+      );
+  }
+}
+