From 865cb6c6af012022a987acb17eb2fdea419d725d Mon Sep 17 00:00:00 2001
From: Jordan Justen <jordan.l.justen@intel.com>
Date: Mon, 30 May 2016 18:52:08 -0700
Subject: [PATCH] MdePkg BaseMemoryLibOptDxe: Convert X64/ScanMem8.asm to NASM

The BaseTools/Scripts/ConvertMasmToNasm.py script was used to convert
X64/ScanMem8.asm to X64/ScanMem8.nasm

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
---
 .../BaseMemoryLibOptDxe.inf                   |  1 +
 .../BaseMemoryLibOptDxe/X64/ScanMem8.nasm     | 55 +++++++++++++++++++
 2 files changed, 56 insertions(+)
 create mode 100644 MdePkg/Library/BaseMemoryLibOptDxe/X64/ScanMem8.nasm

diff --git a/MdePkg/Library/BaseMemoryLibOptDxe/BaseMemoryLibOptDxe.inf b/MdePkg/Library/BaseMemoryLibOptDxe/BaseMemoryLibOptDxe.inf
index da232034d7..94d628fe84 100644
--- a/MdePkg/Library/BaseMemoryLibOptDxe/BaseMemoryLibOptDxe.inf
+++ b/MdePkg/Library/BaseMemoryLibOptDxe/BaseMemoryLibOptDxe.inf
@@ -101,6 +101,7 @@
   X64/ScanMem16.nasm
   X64/ScanMem16.asm
   X64/ScanMem16.S
+  X64/ScanMem8.nasm
   X64/ScanMem8.asm
   X64/ScanMem8.S
   X64/CompareMem.asm
diff --git a/MdePkg/Library/BaseMemoryLibOptDxe/X64/ScanMem8.nasm b/MdePkg/Library/BaseMemoryLibOptDxe/X64/ScanMem8.nasm
new file mode 100644
index 0000000000..f3f7e8e213
--- /dev/null
+++ b/MdePkg/Library/BaseMemoryLibOptDxe/X64/ScanMem8.nasm
@@ -0,0 +1,55 @@
+;------------------------------------------------------------------------------
+;
+; 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.Asm
+;
+; Abstract:
+;
+;   ScanMem8 function
+;
+; Notes:
+;
+;   The following BaseMemoryLib instances contain the same copy of this file:
+;
+;       BaseMemoryLibRepStr
+;       BaseMemoryLibMmx
+;       BaseMemoryLibSse2
+;       BaseMemoryLibOptDxe
+;       BaseMemoryLibOptPei
+;
+;------------------------------------------------------------------------------
+
+    DEFAULT REL
+    SECTION .text
+
+;------------------------------------------------------------------------------
+; CONST VOID *
+; EFIAPI
+; InternalMemScanMem8 (
+;   IN      CONST VOID                *Buffer,
+;   IN      UINTN                     Length,
+;   IN      UINT8                     Value
+;   );
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMemScanMem8)
+ASM_PFX(InternalMemScanMem8):
+    push    rdi
+    mov     rdi, rcx
+    mov     rcx, rdx
+    mov     rax, r8
+    repne   scasb
+    lea     rax, [rdi - 1]
+    cmovnz  rax, rcx                    ; set rax to 0 if not found
+    pop     rdi
+    ret
+