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 .code 25 26;------------------------------------------------------------------------------ 27; VOID * 28; InternalMemZeroMem ( 29; IN VOID *Buffer, 30; IN UINTN Count 31; ); 32;------------------------------------------------------------------------------ 33InternalMemZeroMem PROC USES rdi 34 mov rdi, rcx 35 mov rcx, rdx 36 mov r8, rdi 37 and edx, 7 38 shr rcx, 3 39 jz @ZeroBytes 40 DB 0fh, 0efh, 0c0h ; pxor mm0, mm0 41@@: 42 DB 0fh, 0e7h, 7 ; movntq [rdi], mm0 43 add rdi, 8 44 loop @B 45 DB 0fh, 0aeh, 0f0h ; mfence 46@ZeroBytes: 47 xor eax, eax 48 mov ecx, edx 49 rep stosb 50 mov rax, r8 51 ret 52InternalMemZeroMem ENDP 53 54 END 55