1;------------------------------------------------------------------------------ 2; 3; Copyright (c) 2006, 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; CopyMem.Asm 15; 16; Abstract: 17; 18; CopyMem function 19; 20; Notes: 21; 22;------------------------------------------------------------------------------ 23 24 .386 25 .model flat,C 26 .code 27 28;------------------------------------------------------------------------------ 29; VOID * 30; InternalMemCopyMem ( 31; IN VOID *Destination, 32; IN VOID *Source, 33; IN UINTN Count 34; ) 35;------------------------------------------------------------------------------ 36InternalMemCopyMem PROC USES esi edi 37 mov esi, [esp + 16] ; esi <- Source 38 mov edi, [esp + 12] ; edi <- Destination 39 mov edx, [esp + 20] ; edx <- Count 40 lea eax, [esi + edx - 1] ; eax <- End of Source 41 cmp esi, edi 42 jae @F 43 cmp eax, edi 44 jae @CopyBackward ; Copy backward if overlapped 45@@: 46 mov ecx, edx 47 and edx, 3 48 shr ecx, 2 49 rep movsd ; Copy as many Dwords as possible 50 jmp @CopyBytes 51@CopyBackward: 52 mov esi, eax ; esi <- End of Source 53 lea edi, [edi + edx - 1] ; edi <- End of Destination 54 std 55@CopyBytes: 56 mov ecx, edx 57 rep movsb ; Copy bytes backward 58 cld 59 mov eax, [esp + 12] ; eax <- Destination as return value 60 ret 61InternalMemCopyMem ENDP 62 63 END 64