mirror of https://github.com/acidanthera/audk.git
49 lines
1.4 KiB
NASM
49 lines
1.4 KiB
NASM
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;------------------------------------------------------------------------------
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;
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; Copyright (c) 2006, Intel Corporation
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; All rights reserved. This program and the accompanying materials
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; are licensed and made available under the terms and conditions of the BSD License
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; which accompanies this distribution. The full text of the license may be found at
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; http://opensource.org/licenses/bsd-license.php
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;
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; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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;
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; Module Name:
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;
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; ZeroMem.Asm
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;
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; Abstract:
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;
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; ZeroMem function
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;
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; Notes:
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;
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;------------------------------------------------------------------------------
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.code
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;------------------------------------------------------------------------------
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; VOID *
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; InternalMemZeroMem (
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; IN VOID *Buffer,
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; IN UINTN Count
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; );
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;------------------------------------------------------------------------------
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InternalMemZeroMem PROC USES rdi
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push rcx ; push Buffer
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xor rax, rax ; rax = 0
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mov rdi, rcx ; rdi = Buffer
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mov rcx, rdx ; rcx = Count
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shr rcx, 3 ; rcx = rcx / 8
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and rdx, 7 ; rdx = rdx & 7
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cld
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rep stosq
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mov rcx, rdx ; rcx = rdx
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rep stosb
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pop rax ; rax = Buffer
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ret
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InternalMemZeroMem ENDP
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END
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