1;------------------------------------------------------------------------------ 2; 3; Copyright (c) 2006, 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; SetMem function 19; 20; Notes: 21; 22;------------------------------------------------------------------------------ 23 24 .686 25 .model flat,C 26 .xmm 27 .code 28 29;------------------------------------------------------------------------------ 30; VOID * 31; EFIAPI 32; InternalMemSetMem ( 33; IN VOID *Buffer, 34; IN UINTN Count, 35; IN UINT8 Value 36; ); 37;------------------------------------------------------------------------------ 38InternalMemSetMem PROC USES edi 39 mov edx, [esp + 12] ; edx <- Count 40 mov edi, [esp + 8] ; edi <- Buffer 41 mov al, [esp + 16] ; al <- Value 42 xor ecx, ecx 43 sub ecx, edi 44 and ecx, 15 ; ecx + edi aligns on 16-byte boundary 45 jz @F 46 cmp ecx, edx 47 cmova ecx, edx 48 sub edx, ecx 49 rep stosb 50@@: 51 mov ecx, edx 52 and edx, 15 53 shr ecx, 4 ; ecx <- # of DQwords to set 54 jz @SetBytes 55 mov ah, al ; ax <- Value | (Value << 8) 56 add esp, -16 57 movdqu [esp], xmm0 ; save xmm0 58 movd xmm0, eax 59 pshuflw xmm0, xmm0, 0 ; xmm0[0..63] <- Value repeats 8 times 60 movlhps xmm0, xmm0 ; xmm0 <- Value repeats 16 times 61@@: 62 movntdq [edi], xmm0 ; edi should be 16-byte aligned 63 add edi, 16 64 loop @B 65 mfence 66 movdqu xmm0, [esp] ; restore xmm0 67 add esp, 16 ; stack cleanup 68@SetBytes: 69 mov ecx, edx 70 rep stosb 71 mov eax, [esp + 8] ; eax <- Buffer as return value 72 ret 73InternalMemSetMem ENDP 74 75 END 76