1 files changed, 37 insertions, 0 deletions
diff --git a/roms/edk2/MdePkg/Library/BaseLib/X64/EnableCache.nasm b/roms/edk2/MdePkg/Library/BaseLib/X64/EnableCache.nasm
new file mode 100644
index 000000000..b6fae3cbf
--- /dev/null
+++ b/roms/edk2/MdePkg/Library/BaseLib/X64/EnableCache.nasm
@@ -0,0 +1,37 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+;   EnableCache.Asm
+;
+; Abstract:
+;
+;  Flush all caches with a WBINVD instruction, clear the CD bit of CR0 to 0, and clear
+;  the NW bit of CR0 to 0
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    DEFAULT REL
+    SECTION .text
+
+;------------------------------------------------------------------------------
+; VOID
+; EFIAPI
+; AsmEnableCache (
+;   VOID
+;   );
+;------------------------------------------------------------------------------
+global ASM_PFX(AsmEnableCache)
+ASM_PFX(AsmEnableCache):
+    wbinvd
+    mov     rax, cr0
+    btr     rax, 29
+    btr     rax, 30
+    mov     cr0, rax
+    ret
+