mirror of https://github.com/acidanthera/audk.git
70 lines
2.3 KiB
NASM
70 lines
2.3 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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.code
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;------------------------------------------------------------------------------
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; VOID *
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; InternalMemSetMem (
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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 rdi
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mov rdi, rcx ; rdi <- Buffer
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mov al, r8b ; al <- Value
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mov r9, rdi ; r9 <- Buffer as return value
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xor rcx, rcx
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sub rcx, rdi
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and rcx, 15 ; rcx + rdi aligns on 16-byte boundary
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jz @F
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cmp rcx, rdx
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cmova rcx, rdx
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sub rdx, rcx
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rep stosb
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@@:
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mov rcx, rdx
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and rdx, 15
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shr rcx, 4
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jz @SetBytes
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mov ah, al ; ax <- Value repeats twice
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movdqa [rsp + 10h], xmm0 ; save xmm0
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movd xmm0, eax ; xmm0[0..16] <- Value repeats twice
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pshuflw xmm0, xmm0, 0 ; xmm0[0..63] <- Value repeats 8 times
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movlhps xmm0, xmm0 ; xmm0 <- Value repeats 16 times
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@@:
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movntdq [rdi], xmm0 ; rdi should be 16-byte aligned
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add rdi, 16
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loop @B
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mfence
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movdqa xmm0, [rsp + 10h] ; restore xmm0
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@SetBytes:
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mov ecx, edx ; high 32 bits of rcx are always zero
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rep stosb
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mov rax, r9 ; rax <- Return value
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ret
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InternalMemSetMem ENDP
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END
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