1#------------------------------------------------------------------------------
2#
3# Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
4# This program and the accompanying materials
5# are licensed and made available under the terms and conditions of the BSD License
6# which accompanies this distribution.  The full text of the license may be found at
7# http://opensource.org/licenses/bsd-license.php.
8#
9# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
10# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
11#
12# Module Name:
13#
14#   CompareMem.Asm
15#
16# Abstract:
17#
18#   CompareMem function
19#
20# Notes:
21#
22#   The following BaseMemoryLib instances contain the same copy of this file:
23#
24#       BaseMemoryLibRepStr
25#       BaseMemoryLibMmx
26#       BaseMemoryLibSse2
27#       BaseMemoryLibOptDxe
28#       BaseMemoryLibOptPei
29#
30#------------------------------------------------------------------------------
31
32ASM_GLOBAL ASM_PFX(InternalMemCompareMem)
33
34#------------------------------------------------------------------------------
35# INTN
36# EFIAPI
37# InternalMemCompareMem (
38#   IN      CONST VOID                *DestinationBuffer,
39#   IN      CONST VOID                *SourceBuffer,
40#   IN      UINTN                     Length
41#   );
42#------------------------------------------------------------------------------
43ASM_PFX(InternalMemCompareMem):
44    push    %esi
45    push    %edi
46    movl    12(%esp), %esi
47    movl    16(%esp), %edi
48    movl    20(%esp), %ecx
49    repe    cmpsb
50    movzbl  -1(%esi), %eax
51    movzbl  -1(%edi), %edx
52    subl    %edx, %eax
53    pop     %edi
54    pop     %esi
55    ret
56