mirror of https://github.com/acidanthera/audk.git
67 lines
2.0 KiB
NASM
67 lines
2.0 KiB
NASM
;------------------------------------------------------------------------------
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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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; SetMem.asm
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;
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; Abstract:
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;
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; SetMem function
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;
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; Notes:
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;
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;------------------------------------------------------------------------------
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.686
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.model flat,C
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.xmm
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.code
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;------------------------------------------------------------------------------
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; VOID *
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; _mem_SetMem (
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; IN VOID *Buffer,
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; IN UINTN Count,
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; IN UINT8 Value
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; )
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;------------------------------------------------------------------------------
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InternalMemSetMem PROC USES edi
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mov ecx, [esp + 12] ; ecx <- Count
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mov edi, [esp + 8] ; edi <- Buffer
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mov edx, ecx
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shr ecx, 3 ; # of Qwords to set
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mov al, [esp + 16] ; al <- Value
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jz @SetBytes
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mov ah, al ; ax <- Value | (Value << 8)
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push ecx
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push ecx
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movq [esp], mm0 ; save mm0
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movd mm0, eax
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pshufw mm0, mm0, 0 ; fill mm0 with 8 Value's
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@@:
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movntq [edi], mm0
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add edi, 8
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loop @B
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mfence
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movq mm0, [esp] ; restore mm0
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pop ecx ; stack cleanup
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pop ecx
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@SetBytes:
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and edx, 7
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mov ecx, edx
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rep stosb
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mov eax, [esp + 8] ; eax <- Buffer as return value
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ret
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InternalMemSetMem ENDP
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END
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