mirror of https://github.com/acidanthera/audk.git
63 lines
1.9 KiB
NASM
63 lines
1.9 KiB
NASM
;------------------------------------------------------------------------------
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;
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; Copyright (c) 2007, 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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; SetMem.asm
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;
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; Abstract:
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;
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; memset 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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; memset (
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; OUT VOID *Buffer, --> rcx
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; IN UINT8 Value, --> rdx
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; IN UINTN Length --> r8
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; );
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;------------------------------------------------------------------------------
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memset PROC USES rdi
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mov rax, rcx
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cmp r8, 0 ; if Size == 0, do nothing
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je @SetDone
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mov rax, rdx ; rdx <-> r8
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mov rdx, r8 ; rdx <- Length
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mov r8, rax ; r8 <- Value
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mov ah, al
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DB 48h, 0fh, 6eh, 0c0h ; movd mm0, rax
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mov r8, rcx
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mov rdi, r8 ; rdi <- Buffer
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mov rcx, rdx
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and edx, 7
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shr rcx, 3
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jz @SetBytes
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DB 0fh, 70h, 0C0h, 00h ; pshufw mm0, mm0, 0h
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@@:
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DB 48h, 0fh, 7eh, 07h ; movd [rdi], mm0
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add rdi, 8
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loop @B
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@SetBytes:
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mov ecx, edx
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rep stosb
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mov rax, r8
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@SetDone:
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ret
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memset ENDP
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END
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