1 ;------------------------------------------------------------------------------ 2 ; 3 ; Copyright (c) 2007, 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 ; SetMem.asm 15 ; 16 ; Abstract: 17 ; 18 ; memset function 19 ; 20 ; Notes: 21 ; 22 ;------------------------------------------------------------------------------ 23 24 .686 25 .model flat,C 26 .mmx 27 .code 28 29 ;------------------------------------------------------------------------------ 30 ; VOID * 31 ; memset ( 32 ; OUT VOID *Buffer, 33 ; IN UINT8 Value, 34 ; IN UINTN Count 35 ; ) 36 ;------------------------------------------------------------------------------ 37 memset PROC USES edi 38 mov al, [esp + 12] 39 mov ah, al 40 shrd edx, eax, 16 41 shld eax, edx, 16 42 mov ecx, [esp + 16] ; ecx <- Count 43 cmp ecx, 0 ; if Count == 0, do nothing 44 je @SetDone 45 mov edi, [esp + 8] ; edi <- Buffer 46 mov edx, ecx 47 and edx, 7 48 shr ecx, 3 ; # of Qwords to set 49 jz @SetBytes 50 add esp, -10h 51 movq [esp], mm0 ; save mm0 52 movq [esp + 8], mm1 ; save mm1 53 movd mm0, eax 54 movd mm1, eax 55 psllq mm0, 32 56 por mm0, mm1 ; fill mm0 with 8 Value's 57 @@: 58 movq [edi], mm0 59 add edi, 8 60 loop @B 61 movq mm0, [esp] ; restore mm0 62 movq mm1, [esp + 8] ; restore mm1 63 add esp, 10h ; stack cleanup 64 @SetBytes: 65 mov ecx, edx 66 rep stosb 67 @SetDone: 68 mov eax, [esp + 8] ; eax <- Buffer as return value 69 ret 70 memset ENDP 71 72 END 73
