--- /dev/null
+;------------------------------------------------------------------------------\r
+;\r
+; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>\r
+; This program and the accompanying materials\r
+; are licensed and made available under the terms and conditions of the BSD License\r
+; which accompanies this distribution. The full text of the license may be found at\r
+; http://opensource.org/licenses/bsd-license.php.\r
+;\r
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+;\r
+; Module Name:\r
+;\r
+; CompareMem.Asm\r
+;\r
+; Abstract:\r
+;\r
+; CompareMem function\r
+;\r
+; Notes:\r
+;\r
+; The following BaseMemoryLib instances contain the same copy of this file:\r
+;\r
+; BaseMemoryLibRepStr\r
+; BaseMemoryLibMmx\r
+; BaseMemoryLibSse2\r
+; BaseMemoryLibOptDxe\r
+; BaseMemoryLibOptPei\r
+;\r
+;------------------------------------------------------------------------------\r
+\r
+ DEFAULT REL\r
+ SECTION .text\r
+\r
+;------------------------------------------------------------------------------\r
+; INTN\r
+; EFIAPI\r
+; InternalMemCompareMem (\r
+; IN CONST VOID *DestinationBuffer,\r
+; IN CONST VOID *SourceBuffer,\r
+; IN UINTN Length\r
+; );\r
+;------------------------------------------------------------------------------\r
+global ASM_PFX(InternalMemCompareMem)\r
+ASM_PFX(InternalMemCompareMem):\r
+ push rsi\r
+ push rdi\r
+ mov rsi, rcx\r
+ mov rdi, rdx\r
+ mov rcx, r8\r
+ repe cmpsb\r
+ movzx rax, byte [rsi - 1]\r
+ movzx rdx, byte [rdi - 1]\r
+ sub rax, rdx\r
+ pop rdi\r
+ pop rsi\r
+ ret\r
+\r