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 .code 25 26 ;------------------------------------------------------------------------------ 27 ; VOID * 28 ; memset ( 29 ; OUT VOID *Buffer, --> rcx 30 ; IN UINT8 Value, --> rdx 31 ; IN UINTN Length --> r8 32 ; ); 33 ;------------------------------------------------------------------------------ 34 memset PROC USES rdi 35 mov rax, rcx 36 cmp r8, 0 ; if Size == 0, do nothing 37 je @SetDone 38 mov rax, rdx ; rdx <-> r8 39 mov rdx, r8 ; rdx <- Length 40 mov r8, rax ; r8 <- Value 41 mov ah, al 42 DB 48h, 0fh, 6eh, 0c0h ; movd mm0, rax 43 mov r8, rcx 44 mov rdi, r8 ; rdi <- Buffer 45 mov rcx, rdx 46 and edx, 7 47 shr rcx, 3 48 jz @SetBytes 49 DB 0fh, 70h, 0C0h, 00h ; pshufw mm0, mm0, 0h 50 @@: 51 DB 48h, 0fh, 7eh, 07h ; movd [rdi], mm0 52 add rdi, 8 53 loop @B 54 @SetBytes: 55 mov ecx, edx 56 rep stosb 57 mov rax, r8 58 @SetDone: 59 ret 60 memset ENDP 61 62 END 63
