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 ; ZeroMem.asm 15 ; 16 ; Abstract: 17 ; 18 ; ZeroMem function 19 ; 20 ; Notes: 21 ; 22 ;------------------------------------------------------------------------------ 23 24 .686 25 .model flat,C 26 .xmm 27 .code 28 29 ;------------------------------------------------------------------------------ 30 ; VOID * 31 ; EFIAPI 32 ; InternalMemZeroMem ( 33 ; IN VOID *Buffer, 34 ; IN UINTN Count 35 ; ); 36 ;------------------------------------------------------------------------------ 37 InternalMemZeroMem PROC USES edi 38 mov edi, [esp + 8] 39 mov edx, [esp + 12] 40 xor ecx, ecx 41 sub ecx, edi 42 xor eax, eax 43 and ecx, 15 44 jz @F 45 cmp ecx, edx 46 cmova ecx, edx 47 sub edx, ecx 48 rep stosb 49 @@: 50 mov ecx, edx 51 and edx, 15 52 shr ecx, 4 53 jz @ZeroBytes 54 pxor xmm0, xmm0 55 @@: 56 movntdq [edi], xmm0 57 add edi, 16 58 loop @B 59 mfence 60 @ZeroBytes: 61 mov ecx, edx 62 rep stosb 63 mov eax, [esp + 8] 64 ret 65 InternalMemZeroMem ENDP 66 67 END 68
