1 files changed, 35 insertions, 0 deletions
diff --git a/roms/edk2/MdePkg/Library/BaseLib/X64/Mwait.nasm b/roms/edk2/MdePkg/Library/BaseLib/X64/Mwait.nasm
new file mode 100644
index 000000000..83fc89549
--- /dev/null
+++ b/roms/edk2/MdePkg/Library/BaseLib/X64/Mwait.nasm
@@ -0,0 +1,35 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+;   Mwait.Asm
+;
+; Abstract:
+;
+;   AsmMwait function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    DEFAULT REL
+    SECTION .text
+
+;------------------------------------------------------------------------------
+; UINT64
+; EFIAPI
+; AsmMwait (
+;   IN      UINTN                     Eax,
+;   IN      UINTN                     Ecx
+;   );
+;------------------------------------------------------------------------------
+global ASM_PFX(AsmMwait)
+ASM_PFX(AsmMwait):
+    mov     eax, ecx
+    mov     ecx, edx
+    DB      0xf, 1, 0xc9                ; mwait
+    ret
+