1 files changed, 51 insertions, 0 deletions
diff --git a/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseMemoryLibSse2/Ia32/CompareMem.nasm b/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseMemoryLibSse2/Ia32/CompareMem.nasm
new file mode 100644
index 00000000..e8b51143
--- /dev/null
+++ b/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseMemoryLibSse2/Ia32/CompareMem.nasm
@@ -0,0 +1,51 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+;   CompareMem.Asm
+;
+; Abstract:
+;
+;   CompareMem function
+;
+; Notes:
+;
+;   The following BaseMemoryLib instances contain the same copy of this file:
+;
+;       BaseMemoryLibRepStr
+;       BaseMemoryLibMmx
+;       BaseMemoryLibSse2
+;       BaseMemoryLibOptDxe
+;       BaseMemoryLibOptPei
+;
+;------------------------------------------------------------------------------
+
+    SECTION .text
+
+;------------------------------------------------------------------------------
+; INTN
+; EFIAPI
+; InternalMemCompareMem (
+;   IN      CONST VOID                *DestinationBuffer,
+;   IN      CONST VOID                *SourceBuffer,
+;   IN      UINTN                     Length
+;   );
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMemCompareMem)
+ASM_PFX(InternalMemCompareMem):
+    push    esi
+    push    edi
+    mov     esi, [esp + 12]
+    mov     edi, [esp + 16]
+    mov     ecx, [esp + 20]
+    repe    cmpsb
+    movzx   eax, byte [esi - 1]
+    movzx   edx, byte [edi - 1]
+    sub     eax, edx
+    pop     edi
+    pop     esi
+    ret
+