1 files changed, 43 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseLib/X64/Monitor.asm b/Core/MdePkg/Library/BaseLib/X64/Monitor.asm
new file mode 100644
index 0000000000..8ae6e7320c
--- /dev/null
+++ b/Core/MdePkg/Library/BaseLib/X64/Monitor.asm
@@ -0,0 +1,43 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, 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:
+;
+;   Monitor.Asm
+;
+; Abstract:
+;
+;   AsmMonitor function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    .code
+
+;------------------------------------------------------------------------------
+; UINT64
+; EFIAPI
+; AsmMonitor (
+;   IN      UINTN                     Eax,
+;   IN      UINTN                     Ecx,
+;   IN      UINTN                     Edx
+;   );
+;------------------------------------------------------------------------------
+AsmMonitor  PROC
+    mov     eax, ecx
+    mov     ecx, edx
+    mov     edx, r8d
+    DB      0fh, 1, 0c8h                ; monitor
+    ret
+AsmMonitor  ENDP
+
+    END