1 files changed, 50 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseLib/Ia32/RRotU64.nasm b/Core/MdePkg/Library/BaseLib/Ia32/RRotU64.nasm
new file mode 100644
index 0000000000..81102022cf
--- /dev/null
+++ b/Core/MdePkg/Library/BaseLib/Ia32/RRotU64.nasm
@@ -0,0 +1,50 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006 - 2015, 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:
+;
+;   RRotU64.nasm
+;
+; Abstract:
+;
+;   64-bit right rotation for Ia32
+;
+;------------------------------------------------------------------------------
+
+    SECTION .text
+
+;------------------------------------------------------------------------------
+; UINT64
+; EFIAPI
+; InternalMathRRotU64 (
+;   IN      UINT64                    Operand,
+;   IN      UINTN                     Count
+;   );
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMathRRotU64)
+ASM_PFX(InternalMathRRotU64):
+    push    ebx
+    mov     cl, [esp + 16]
+    mov     eax, [esp + 8]
+    mov     edx, [esp + 12]
+    shrd    ebx, eax, cl
+    shrd    eax, edx, cl
+    rol     ebx, cl
+    shrd    edx, ebx, cl
+    test    cl, 32                      ; Count >= 32?
+    jz      .0
+    mov     ecx, eax                    ; switch eax & edx if Count >= 32
+    mov     eax, edx
+    mov     edx, ecx
+.0:
+    pop     ebx
+    ret
+