1 ;------------------------------------------------------------------------------ 2 ; 3 ; Copyright (c) 2007, 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 ; EfiCommonLibZeroMem ( 29 ; IN VOID *Buffer, 30 ; IN UINTN Size 31 ; ); 32 ;------------------------------------------------------------------------------ 33 EfiCommonLibZeroMem PROC USES rdi 34 mov rdi, rcx 35 xor rcx, rcx 36 xor eax, eax 37 sub rcx, rdi 38 and rcx, 15 39 jz @F 40 cmp rcx, rdx 41 cmova rcx, rdx 42 sub rdx, rcx 43 rep stosb 44 @@: 45 mov rcx, rdx 46 and edx, 15 47 shr rcx, 4 48 jz @ZeroBytes 49 pxor xmm0, xmm0 50 @@: 51 movdqa [rdi], xmm0 ; rdi should be 16-byte aligned 52 add rdi, 16 53 loop @B 54 @ZeroBytes: 55 mov ecx, edx 56 rep stosb 57 ret 58 EfiCommonLibZeroMem ENDP 59 60 END 61
