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 .686 25 .model flat,C 26 .mmx 27 .code 28 29;------------------------------------------------------------------------------ 30; VOID * 31; EFIAPI 32; InternalMemCopyMem ( 33; IN VOID *Destination, 34; IN VOID *Source, 35; IN UINTN Count 36; ); 37;------------------------------------------------------------------------------ 38InternalMemCopyMem PROC USES esi edi 39 mov esi, [esp + 16] ; esi <- Source 40 mov edi, [esp + 12] ; edi <- Destination 41 mov edx, [esp + 20] ; edx <- Count 42 lea eax, [esi + edx - 1] ; eax <- End of Source 43 cmp esi, edi 44 jae @F 45 cmp eax, edi ; Overlapped? 46 jae @CopyBackward ; Copy backward if overlapped 47@@: 48 mov ecx, edx 49 and edx, 7 50 shr ecx, 3 ; ecx <- # of Qwords to copy 51 jz @CopyBytes 52 push eax 53 push eax 54 movq [esp], mm0 ; save mm0 55@@: 56 movq mm0, [esi] 57 movq [edi], mm0 58 add esi, 8 59 add edi, 8 60 loop @B 61 movq mm0, [esp] ; restore mm0 62 pop ecx ; stack cleanup 63 pop ecx ; stack cleanup 64 jmp @CopyBytes 65@CopyBackward: 66 mov esi, eax ; esi <- Last byte in Source 67 lea edi, [edi + edx - 1] ; edi <- Last byte in Destination 68 std 69@CopyBytes: 70 mov ecx, edx 71 rep movsb 72 cld 73 mov eax, [esp + 12] 74 ret 75InternalMemCopyMem ENDP 76 77 END 78