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, 30 ; IN UINT8 Value, 31 ; IN UINTN Count 32 ; ) 33 ;------------------------------------------------------------------------------ 34 memset PROC USES rdi 35 cmp r8, 0 ; if Size == 0, do nothing 36 mov r9, rcx 37 je @SetDone 38 mov al, dl 39 mov ah, al 40 shrd edx, eax, 16 41 shld eax, edx, 16 42 mov rdi, rcx 43 mov rcx, r8 44 shr rcx, 2 45 rep stosd 46 mov rcx, r8 47 and rcx, 3 48 rep stosb 49 @SetDone: 50 mov rax, r9 51 ret 52 memset ENDP 53 54 END 55 56
