;------------------------------------------------------------------------------ ; ; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR> ; This program and the accompanying materials ; are licensed and made available under the terms and conditions of the BSD License ; which accompanies this distribution. The full text of the license may be found at ; http://opensource.org/licenses/bsd-license.php. ; ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. ; ; Module Name: ; ; ZeroMem.nasm ; ; Abstract: ; ; ZeroMem function ; ; Notes: ; ;------------------------------------------------------------------------------ DEFAULT REL SECTION .text ;------------------------------------------------------------------------------ ; VOID * ; InternalMemZeroMem ( ; IN VOID *Buffer, ; IN UINTN Count ; ) ;------------------------------------------------------------------------------ global ASM_PFX(InternalMemZeroMem) ASM_PFX(InternalMemZeroMem): push rdi mov rdi, rcx xor rcx, rcx xor eax, eax sub rcx, rdi and rcx, 15 mov r8, rdi jz .0 cmp rcx, rdx cmova rcx, rdx sub rdx, rcx rep stosb .0: mov rcx, rdx and edx, 15 shr rcx, 4 jz @ZeroBytes pxor xmm0, xmm0 .1: movntdq [rdi], xmm0 ; rdi should be 16-byte aligned add rdi, 16 loop .1 mfence @ZeroBytes: mov ecx, edx rep stosb mov rax, r8 pop rdi ret