1 ;------------------------------------------------------------------------------
3 ; Copyright (c) 2016, 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.
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.
18 ; IsZeroBuffer function
22 ;------------------------------------------------------------------------------
27 ;------------------------------------------------------------------------------
30 ; InternalMemIsZeroBuffer (
31 ; IN CONST VOID *Buffer,
34 ;------------------------------------------------------------------------------
35 global ASM_PFX(InternalMemIsZeroBuffer)
36 ASM_PFX(InternalMemIsZeroBuffer):
38 mov rdi, rcx ; rdi <- Buffer
39 mov rcx, rdx ; rcx <- Length
40 shr rcx, 3 ; rcx <- number of qwords
41 and rdx, 7 ; rdx <- number of trailing bytes
42 xor rax, rax ; rax <- 0, also set ZF
44 jnz @ReturnFalse ; ZF=0 means non-zero element found
49 mov rax, 1 ; return TRUE