1 files changed, 36 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseLib/Ia32/DisableCache.c b/Core/MdePkg/Library/BaseLib/Ia32/DisableCache.c
new file mode 100644
index 0000000000..dbfb429090
--- /dev/null
+++ b/Core/MdePkg/Library/BaseLib/Ia32/DisableCache.c
@@ -0,0 +1,36 @@
+/** @file
+  AsmDisableCache function
+
+  Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+  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.
+
+**/
+
+/**
+  Set CD bit and clear NW bit of CR0 followed by a WBINVD.
+
+  Disables the caches by setting the CD bit of CR0 to 1, clearing the NW bit of CR0 to 0,
+  and executing a WBINVD instruction.  This function is only available on IA-32 and x64.
+
+**/
+VOID
+EFIAPI
+AsmDisableCache (
+  VOID
+  )
+{
+  _asm {
+    mov     eax, cr0
+    bts     eax, 30
+    btr     eax, 29
+    mov     cr0, eax
+    wbinvd
+  }
+}
+