1 files changed, 37 insertions, 0 deletions
diff --git a/roms/edk2/MdePkg/Library/BaseLib/X64/Monitor.nasm b/roms/edk2/MdePkg/Library/BaseLib/X64/Monitor.nasm
new file mode 100644
index 000000000..e1ccb83a8
--- /dev/null
+++ b/roms/edk2/MdePkg/Library/BaseLib/X64/Monitor.nasm
@@ -0,0 +1,37 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+;   Monitor.Asm
+;
+; Abstract:
+;
+;   AsmMonitor function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    DEFAULT REL
+    SECTION .text
+
+;------------------------------------------------------------------------------
+; UINT64
+; EFIAPI
+; AsmMonitor (
+;   IN      UINTN                     Eax,
+;   IN      UINTN                     Ecx,
+;   IN      UINTN                     Edx
+;   );
+;------------------------------------------------------------------------------
+global ASM_PFX(AsmMonitor)
+ASM_PFX(AsmMonitor):
+    mov     eax, ecx
+    mov     ecx, edx
+    mov     edx, r8d
+    DB      0xf, 1, 0xc8                ; monitor
+    ret
+