1 files changed, 30 insertions, 0 deletions
diff --git a/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseLib/Ia32/EnableCache.c b/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseLib/Ia32/EnableCache.c
new file mode 100644
index 00000000..d5bf82f7
--- /dev/null
+++ b/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseLib/Ia32/EnableCache.c
@@ -0,0 +1,30 @@
+/** @file
+  AsmEnableCache function
+
+  Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+/**
+  Perform a WBINVD and clear both the CD and NW bits of CR0.
+
+  Enables the caches by executing a WBINVD instruction and then clear both the CD and NW
+  bits of CR0 to 0.  This function is only available on IA-32 and x64.
+
+**/
+VOID
+EFIAPI
+AsmEnableCache (
+  VOID
+  )
+{
+  _asm {
+    wbinvd
+    mov     eax, cr0
+    btr     eax, 30
+    btr     eax, 29
+    mov     cr0, eax
+  }
+}
+