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 push rcx ; push Buffer 35 xor rax, rax ; rax = 0 36 mov rdi, rcx ; rdi = Buffer 37 mov rcx, rdx ; rcx = Count 38 shr rcx, 3 ; rcx = rcx / 8 39 and rdx, 7 ; rdx = rdx & 7 40 cld 41 rep stosq 42 mov rcx, rdx ; rcx = rdx 43 rep stosb 44 pop rax ; rax = Buffer 45 ret 46 InternalMemZeroMem ENDP 47 48 END 49
