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 ;------------------------------------------------------------------------------ 38 InternalMemCopyMem 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 75 InternalMemCopyMem ENDP 76 77 END 78
