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 xor rcx, rcx 36 xor eax, eax 37 sub rcx, rdi 38 and rcx, 15 39 mov r8, rdi 40 jz @F 41 cmp rcx, rdx 42 cmova rcx, rdx 43 sub rdx, rcx 44 rep stosb 45@@: 46 mov rcx, rdx 47 and edx, 15 48 shr rcx, 4 49 jz @ZeroBytes 50 pxor xmm0, xmm0 51@@: 52 movntdq [rdi], xmm0 ; rdi should be 16-byte aligned 53 add rdi, 16 54 loop @B 55 mfence 56@ZeroBytes: 57 mov ecx, edx 58 rep stosb 59 mov rax, r8 60 ret 61InternalMemZeroMem ENDP 62 63 END 64