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70 lines
1.8 KiB

4 years ago
;------------------------------------------------------------------------------
;
; Copyright (c) 2006, 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:
;
; SetMem16.nasm
;
; Abstract:
;
; SetMem16 function
;
; Notes:
;
;------------------------------------------------------------------------------
SECTION .text
;------------------------------------------------------------------------------
; VOID *
; EFIAPI
; InternalMemSetMem16 (
; IN VOID *Buffer,
; IN UINTN Count,
; IN UINT16 Value
; );
;------------------------------------------------------------------------------
global ASM_PFX(InternalMemSetMem16)
ASM_PFX(InternalMemSetMem16):
push edi
mov edx, [esp + 12]
mov edi, [esp + 8]
xor ecx, ecx
sub ecx, edi
and ecx, 15 ; ecx + edi aligns on 16-byte boundary
mov eax, [esp + 16]
jz .0
shr ecx, 1
cmp ecx, edx
cmova ecx, edx
sub edx, ecx
rep stosw
.0:
mov ecx, edx
and edx, 7
shr ecx, 3
jz @SetWords
movd xmm0, eax
pshuflw xmm0, xmm0, 0
movlhps xmm0, xmm0
.1:
movntdq [edi], xmm0 ; edi should be 16-byte aligned
add edi, 16
loop .1
mfence
@SetWords:
mov ecx, edx
rep stosw
mov eax, [esp + 8]
pop edi
ret