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.nasm 15 ; 16 ; Abstract: 17 ; 18 ; ZeroMem function 19 ; 20 ; Notes: 21 ; 22 ;------------------------------------------------------------------------------ 23 24 DEFAULT REL 25 SECTION .text 26 27 ;------------------------------------------------------------------------------ 28 ; VOID * 29 ; InternalMemZeroMem ( 30 ; IN VOID *Buffer, 31 ; IN UINTN Count 32 ; ); 33 ;------------------------------------------------------------------------------ 34 global ASM_PFX(InternalMemZeroMem) 35 ASM_PFX(InternalMemZeroMem): 36 push rdi 37 mov rdi, rcx 38 mov rcx, rdx 39 mov r8, rdi 40 and edx, 7 41 shr rcx, 3 42 jz @ZeroBytes 43 DB 0xf, 0xef, 0xc0 ; pxor mm0, mm0 44 .0: 45 DB 0xf, 0xe7, 7 ; movntq [rdi], mm0 46 add rdi, 8 47 loop .0 48 DB 0xf, 0xae, 0xf0 ; mfence 49 @ZeroBytes: 50 xor eax, eax 51 mov ecx, edx 52 rep stosb 53 mov rax, r8 54 pop rdi 55 ret 56 57
