9344f09215
https://bugzilla.tianocore.org/show_bug.cgi?id=1373 Replace BSD 2-Clause License with BSD+Patent License. This change is based on the following emails: https://lists.01.org/pipermail/edk2-devel/2019-February/036260.html https://lists.01.org/pipermail/edk2-devel/2018-October/030385.html RFCs with detailed process for the license change: V3: https://lists.01.org/pipermail/edk2-devel/2019-March/038116.html V2: https://lists.01.org/pipermail/edk2-devel/2019-March/037669.html V1: https://lists.01.org/pipermail/edk2-devel/2019-March/037500.html Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com>
50 lines
1.5 KiB
NASM
50 lines
1.5 KiB
NASM
;------------------------------------------------------------------------------
|
|
;
|
|
; Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
|
|
; SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
;
|
|
; Module Name:
|
|
;
|
|
; IsZeroBuffer.nasm
|
|
;
|
|
; Abstract:
|
|
;
|
|
; IsZeroBuffer function
|
|
;
|
|
; Notes:
|
|
;
|
|
;------------------------------------------------------------------------------
|
|
|
|
SECTION .text
|
|
|
|
;------------------------------------------------------------------------------
|
|
; BOOLEAN
|
|
; EFIAPI
|
|
; InternalMemIsZeroBuffer (
|
|
; IN CONST VOID *Buffer,
|
|
; IN UINTN Length
|
|
; );
|
|
;------------------------------------------------------------------------------
|
|
global ASM_PFX(InternalMemIsZeroBuffer)
|
|
ASM_PFX(InternalMemIsZeroBuffer):
|
|
push edi
|
|
mov edi, [esp + 8] ; edi <- Buffer
|
|
mov ecx, [esp + 12] ; ecx <- Length
|
|
mov edx, ecx ; edx <- ecx
|
|
shr ecx, 2 ; ecx <- number of dwords
|
|
and edx, 3 ; edx <- number of trailing bytes
|
|
xor eax, eax ; eax <- 0, also set ZF
|
|
repe scasd
|
|
jnz @ReturnFalse ; ZF=0 means non-zero element found
|
|
mov ecx, edx
|
|
repe scasb
|
|
jnz @ReturnFalse
|
|
pop edi
|
|
mov eax, 1 ; return TRUE
|
|
ret
|
|
@ReturnFalse:
|
|
pop edi
|
|
xor eax, eax
|
|
ret ; return FALSE
|
|
|