;------------------------------------------------------------------------------ | |
; | |
; Copyright (c) 2006, Intel Corporation | |
; All rights reserved. This program and the accompanying materials | |
; are licensed and made available under the terms and conditions of the BSD License | |
; which accompanies this distribution. The full text of the license may be found at | |
; http://opensource.org/licenses/bsd-license.php | |
; | |
; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
; | |
; Module Name: | |
; | |
; ZeroMem.asm | |
; | |
; Abstract: | |
; | |
; ZeroMem function | |
; | |
; Notes: | |
; | |
;------------------------------------------------------------------------------ | |
.code | |
;------------------------------------------------------------------------------ | |
; VOID * | |
; _mem_ZeroMem ( | |
; IN VOID *Buffer, | |
; IN UINTN Count | |
; ) | |
;------------------------------------------------------------------------------ | |
InternalMemZeroMem PROC USES rdi | |
mov rdi, rcx | |
xor rcx, rcx | |
xor eax, eax | |
sub rcx, rdi | |
and rcx, 15 | |
mov r8, rdi | |
jz @F | |
cmp rcx, rdx | |
cmova rcx, rdx | |
sub rdx, rcx | |
rep stosb | |
@@: | |
mov rcx, rdx | |
and edx, 15 | |
shr rcx, 4 | |
jz @ZeroBytes | |
pxor xmm0, xmm0 | |
@@: | |
movntdq [rdi], xmm0 ; rdi should be 16-byte aligned | |
add rdi, 16 | |
loop @B | |
mfence | |
@ZeroBytes: | |
mov ecx, edx | |
rep stosb | |
mov rax, r8 | |
ret | |
InternalMemZeroMem ENDP | |
END |