1 files changed, 45 insertions, 0 deletions
diff --git a/roms/edk2/MdePkg/Library/BaseLib/Ia32/ARShiftU64.c b/roms/edk2/MdePkg/Library/BaseLib/Ia32/ARShiftU64.c
new file mode 100644
index 000000000..836108364
--- /dev/null
+++ b/roms/edk2/MdePkg/Library/BaseLib/Ia32/ARShiftU64.c
@@ -0,0 +1,45 @@
+/** @file
+  64-bit arithmetic right shift function for IA-32.
+
+  Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+
+
+
+/**
+  Shifts a 64-bit integer right between 0 and 63 bits. The high bits
+  are filled with original integer's bit 63. The shifted value is returned.
+
+  This function shifts the 64-bit value Operand to the right by Count bits. The
+  high Count bits are set to bit 63 of Operand.  The shifted value is returned.
+
+  @param  Operand The 64-bit operand to shift right.
+  @param  Count   The number of bits to shift right.
+
+  @return Operand arithmetically shifted right by Count.
+
+**/
+UINT64
+EFIAPI
+InternalMathARShiftU64 (
+  IN      UINT64                    Operand,
+  IN      UINTN                     Count
+  )
+{
+  _asm {
+    mov     cl, byte ptr [Count]
+    mov     eax, dword ptr [Operand + 4]
+    cdq
+    test    cl, 32
+    jnz     L0
+    mov     edx, eax
+    mov     eax, dword ptr [Operand + 0]
+L0:
+    shrd    eax, edx, cl
+    sar     edx, cl
+  }
+}
+