mirror of https://github.com/acidanthera/audk.git
87 lines
2.3 KiB
NASM
87 lines
2.3 KiB
NASM
;/*++
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;
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;Copyright (c) 2007, Intel Corporation. All rights reserved.<BR>
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;This program and the accompanying materials
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;are licensed and made available under the terms and conditions of the BSD License
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;which accompanies this distribution. The full text of the license may be found at
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;http://opensource.org/licenses/bsd-license.php
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;
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;THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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;WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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;
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;Module Name:
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;
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; EfiCopyMemRep1.asm
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;
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;Abstract:
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;
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; This is the code that uses rep movsb CopyMem service
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;
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;--*/
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;
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;---------------------------------------------------------------------------
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.686
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.model flat,C
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.code
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;---------------------------------------------------------------------------
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;#include "Tiano.h"
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;
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;VOID
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;EfiCommonLibCopyMem (
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; IN VOID *Destination,
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; IN VOID *Source,
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; IN UINTN Count
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; )
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;/*++
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;
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;Routine Description:
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;
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; Copy Length bytes from Source to Destination.
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;
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;Arguments:
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;
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; Destination - Target of copy
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;
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; Source - Place to copy from
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;
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; Length - Number of bytes to copy
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;
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;Returns:
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;
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; None
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;
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;--*/
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EfiCommonLibCopyMem PROC
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push ebp
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mov ebp, esp
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push esi
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push edi
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mov esi, dword ptr[ebp + 0Ch] ; esi <- Source
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mov edi, dword ptr[ebp + 8] ; edi <- Destination
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mov edx, dword ptr[ebp + 10h] ; edx <- Count
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cmp esi, edi
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je _CopyDone
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cmp edx, 0
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je _CopyDone
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lea eax, [esi + edx - 1] ; eax <- End of Source
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cmp esi, edi
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jae _CopyBytes
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cmp eax, edi
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jb _CopyBytes ; Copy backward if overlapped
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mov esi, eax ; esi <- End of Source
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lea edi, [edi + edx - 1] ; edi <- End of Destination
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std
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_CopyBytes:
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mov ecx, edx
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rep movsb ; Copy bytes backward
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cld
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_CopyDone:
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pop edi
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pop esi
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pop ebp
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ret
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EfiCommonLibCopyMem ENDP
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END
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