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;------------------------------------------------------------------------------
;
; Copyright (c) 2007, Intel Corporation. All rights reserved.<BR>
; This program and the accompanying materials
; are licensed and made available under the terms and conditions of the BSD License
; which accompanies this distribution. The full text of the license may be found at
; http://opensource.org/licenses/bsd-license.php
;
; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
;
; Module Name:
;
; SetMem.asm
;
; Abstract:
;
; memset function
;
; Notes:
;
;------------------------------------------------------------------------------
.code
;------------------------------------------------------------------------------
; VOID *
; memset (
; OUT VOID *Buffer, --> rcx
; IN UINT8 Value, --> rdx
; IN UINTN Length --> r8
; );
;------------------------------------------------------------------------------
memset PROC USES rdi
mov rax, rcx
cmp r8, 0 ; if Size == 0, do nothing
je @SetDone
mov rax, rdx ; rdx <-> r8
mov rdx, r8 ; rdx <- Length
mov r8, rax ; r8 <- Value
mov ah, al
DB 48h, 0fh, 6eh, 0c0h ; movd mm0, rax
mov r8, rcx
mov rdi, r8 ; rdi <- Buffer
mov rcx, rdx
and edx, 7
shr rcx, 3
jz @SetBytes
DB 0fh, 70h, 0C0h, 00h ; pshufw mm0, mm0, 0h
@@:
DB 48h, 0fh, 7eh, 07h ; movd [rdi], mm0
add rdi, 8
loop @B
@SetBytes:
mov ecx, edx
rep stosb
mov rax, r8
@SetDone:
ret
memset ENDP
END
|
