2007-07-02 11:34:25 +02:00
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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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# 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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.globl _InternalMemSetMem
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_InternalMemSetMem:
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push %edi
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movl 12(%esp), %edx # edx <- Count
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movl 8(%esp), %edi # edi <- Buffer
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movb 16(%esp), %al # al <- Value
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xorl %ecx, %ecx
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subl %edi, %ecx
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andl $15, %ecx # ecx + edi aligns on 16-byte boundary
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jz L0
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cmpl %edx, %ecx
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cmova %edx, %ecx
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subl %ecx, %edx
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rep
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stosb
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L0:
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movl %edx, %ecx
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andl $15, %edx
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shrl $4, %ecx # ecx <- # of DQwords to set
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jz L_SetBytes
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movb %al, %ah # ax <- Value | (Value << 8)
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addl $-16, %esp
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movdqu %xmm0, (%esp)
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movd %eax, %xmm0
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pshuflw $0, %xmm0, %xmm0
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movlhps %xmm0, %xmm0
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L1:
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movntdq %xmm0, (%edi)
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addl $16, %edi
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loop L1
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mfence
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movdqu (%esp), %xmm0
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addl $16, %esp # stack cleanup
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L_SetBytes:
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movl %edx, %ecx
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rep
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stosb
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movl 8(%esp), %eax # eax <- Buffer as return value
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pop %edi
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ret
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