2 files changed, 44 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/BaseLib.inf b/MdePkg/Library/BaseLib/BaseLib.inf
index 3062b8bbe9..61b49a68c8 100644
--- a/MdePkg/Library/BaseLib/BaseLib.inf
+++ b/MdePkg/Library/BaseLib/BaseLib.inf
@@ -344,6 +344,7 @@
   Ia32/Thunk16.asm | INTEL
   Ia32/EnablePaging64.nasm| INTEL
   Ia32/EnablePaging64.asm | INTEL
+  Ia32/EnableCache.nasm| INTEL
   Ia32/EnableCache.asm | INTEL
   Ia32/DisableCache.asm | INTEL
   Ia32/RdRand.nasm| INTEL
@@ -395,6 +396,7 @@
   Ia32/RShiftU64.S | GCC 
   Ia32/LShiftU64.nasm| GCC
   Ia32/LShiftU64.S | GCC 
+  Ia32/EnableCache.nasm| GCC
   Ia32/EnableCache.S | GCC
   Ia32/DisableCache.S | GCC
   Ia32/RdRand.nasm| GCC
diff --git a/MdePkg/Library/BaseLib/Ia32/EnableCache.nasm b/MdePkg/Library/BaseLib/Ia32/EnableCache.nasm
new file mode 100644
index 0000000000..de61a05e19
--- /dev/null
+++ b/MdePkg/Library/BaseLib/Ia32/EnableCache.nasm
@@ -0,0 +1,42 @@
+;------------------------------------------------------------------------------
+;
+; 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.
+;
+; 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:
+;
+;------------------------------------------------------------------------------
+
+    SECTION .text
+
+;------------------------------------------------------------------------------
+; VOID
+; EFIAPI
+; AsmEnableCache (
+;   VOID
+;   );
+;------------------------------------------------------------------------------
+global ASM_PFX(AsmEnableCache)
+ASM_PFX(AsmEnableCache):
+    wbinvd
+    mov     eax, cr0
+    btr     eax, 29
+    btr     eax, 30
+    mov     cr0, eax
+    ret
+