1 files changed, 57 insertions, 0 deletions
diff --git a/roms/edk2/MdePkg/Library/BaseMemoryLibMmx/Ia32/ScanMem64.nasm b/roms/edk2/MdePkg/Library/BaseMemoryLibMmx/Ia32/ScanMem64.nasm
new file mode 100644
index 000000000..674bcf03e
--- /dev/null
+++ b/roms/edk2/MdePkg/Library/BaseMemoryLibMmx/Ia32/ScanMem64.nasm
@@ -0,0 +1,57 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+;   ScanMem64.Asm
+;
+; Abstract:
+;
+;   ScanMem64 function
+;
+; Notes:
+;
+;   The following BaseMemoryLib instances contain the same copy of this file:
+;
+;       BaseMemoryLibRepStr
+;       BaseMemoryLibMmx
+;       BaseMemoryLibSse2
+;       BaseMemoryLibOptDxe
+;       BaseMemoryLibOptPei
+;
+;------------------------------------------------------------------------------
+
+    SECTION .text
+
+;------------------------------------------------------------------------------
+; CONST VOID *
+; EFIAPI
+; InternalMemScanMem64 (
+;   IN      CONST VOID                *Buffer,
+;   IN      UINTN                     Length,
+;   IN      UINT64                    Value
+;   );
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMemScanMem64)
+ASM_PFX(InternalMemScanMem64):
+    push    edi
+    mov     ecx, [esp + 12]
+    mov     eax, [esp + 16]
+    mov     edx, [esp + 20]
+    mov     edi, [esp + 8]
+.0:
+    cmp     eax, [edi]
+    lea     edi, [edi + 8]
+    loopne  .0
+    jne     .1
+    cmp     edx, [edi - 4]
+    jecxz   .1
+    jne     .0
+.1:
+    lea     eax, [edi - 8]
+    cmovne  eax, ecx
+    pop     edi
+    ret
+