1 files changed, 40 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/X64/RmpAdjust.nasm b/MdePkg/Library/BaseLib/X64/RmpAdjust.nasm
new file mode 100644
index 0000000000..c307f64b51
--- /dev/null
+++ b/MdePkg/Library/BaseLib/X64/RmpAdjust.nasm
@@ -0,0 +1,40 @@
+;-----------------------------------------------------------------------------
+;
+; Copyright (c) 2021, Advanced Micro Devices, Inc. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+;   RmpAdjust.Asm
+;
+; Abstract:
+;
+;   AsmRmpAdjust function
+;
+; Notes:
+;
+;-----------------------------------------------------------------------------
+
+%include "Nasm.inc"
+
+    SECTION .text
+
+;-----------------------------------------------------------------------------
+;  UINT32
+;  EFIAPI
+;  AsmRmpAdjust (
+;    IN  UINT64  Rax,
+;    IN  UINT64  Rcx,
+;    IN  UINT64  Rdx
+;    )
+;-----------------------------------------------------------------------------
+global ASM_PFX(AsmRmpAdjust)
+ASM_PFX(AsmRmpAdjust):
+  mov     rax, rcx       ; Input Rax is in RCX by calling convention
+  mov     rcx, rdx       ; Input Rcx is in RDX by calling convention
+  mov     rdx, r8        ; Input Rdx is in R8  by calling convention
+
+  RMPADJUST
+
+  ; RMPADJUST returns the status in the EAX register.
+  ret