1 files changed, 45 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/Ia32/DisableCache.asm b/MdePkg/Library/BaseLib/Ia32/DisableCache.asm
new file mode 100644
index 0000000000..0d92472687
--- /dev/null
+++ b/MdePkg/Library/BaseLib/Ia32/DisableCache.asm
@@ -0,0 +1,45 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, Intel Corporation
+; 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.
+;
+; Module Name:
+;
+;   DisableCache.Asm
+;
+; Abstract:
+;
+;   Set the CD bit of CR0 to 1, clear the NW bit of CR0 to 0, and flush all caches with a
+;   WBINVD instruction.
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    .386p
+    .model  flat,C
+    .code
+
+;------------------------------------------------------------------------------
+; VOID
+; EFIAPI
+; AsmDisableCache (
+;   VOID
+;   );
+;------------------------------------------------------------------------------
+AsmDisableCache PROC
+    mov     eax, cr0
+    bts     eax, 30
+    btr     eax, 29
+    mov     cr0, eax
+    wbinvd
+    ret
+AsmDisableCache ENDP
+
+    END