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 ;------------------------------------------------------------------------------ 33 InternalMemZeroMem 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 52 InternalMemZeroMem ENDP 53 54 END 55
