1 files changed, 52 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseMemoryLibOptPei/Ia32/ScanMem8.S b/MdePkg/Library/BaseMemoryLibOptPei/Ia32/ScanMem8.S
new file mode 100644
index 000000000000..02bb27f36ac6
--- /dev/null
+++ b/MdePkg/Library/BaseMemoryLibOptPei/Ia32/ScanMem8.S
@@ -0,0 +1,52 @@
+#------------------------------------------------------------------------------
+#
+# Copyright (c) 2006 - 2008, 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:
+#
+#   ScanMem8.S
+#
+# Abstract:
+#
+#   ScanMem8 function
+#
+# Notes:
+#
+#   The following BaseMemoryLib instances contain the same copy of this file:
+#
+#       BaseMemoryLibRepStr
+#       BaseMemoryLibMmx
+#       BaseMemoryLibSse2
+#       BaseMemoryLibOptDxe
+#       BaseMemoryLibOptPei
+#
+#------------------------------------------------------------------------------
+
+ASM_GLOBAL ASM_PFX(InternalMemScanMem8)
+
+#------------------------------------------------------------------------------
+# CONST VOID *
+# EFIAPI
+# InternalMemScanMem8 (
+#   IN      CONST VOID                *Buffer,
+#   IN      UINTN                     Length,
+#   IN      UINT8                     Value
+#   );
+#------------------------------------------------------------------------------
+ASM_PFX(InternalMemScanMem8):
+    push    %edi
+    movl    12(%esp), %ecx
+    movl    8(%esp), %edi
+    movb    16(%esp), %al
+    repne   scasb
+    leal    -1(%edi), %eax
+    cmovnz  %ecx, %eax
+    pop     %edi
+    ret