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 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 61 InternalMemZeroMem ENDP 62 63 END 64
