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 DEFAULT REL 25 SECTION .text 26 27;------------------------------------------------------------------------------ 28; VOID * 29; InternalMemZeroMem ( 30; IN VOID *Buffer, 31; IN UINTN Count 32; ); 33;------------------------------------------------------------------------------ 34global ASM_PFX(InternalMemZeroMem) 35ASM_PFX(InternalMemZeroMem): 36 push rdi 37 push rcx ; push Buffer 38 xor rax, rax ; rax = 0 39 mov rdi, rcx ; rdi = Buffer 40 mov rcx, rdx ; rcx = Count 41 shr rcx, 3 ; rcx = rcx / 8 42 and rdx, 7 ; rdx = rdx & 7 43 cld 44 rep stosq 45 mov rcx, rdx ; rcx = rdx 46 rep stosb 47 pop rax ; rax = Buffer 48 pop rdi 49 ret 50 51