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60 lines
1.3 KiB
NASM
60 lines
1.3 KiB
NASM
;------------------------------------------------------------------------------
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;
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; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
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; SPDX-License-Identifier: BSD-2-Clause-Patent
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;
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; Module Name:
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;
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; ZeroMem.nasm
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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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DEFAULT REL
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SECTION .text
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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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global ASM_PFX(InternalMemZeroMem)
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ASM_PFX(InternalMemZeroMem):
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push rdi
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mov rdi, rcx
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xor rcx, rcx
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xor eax, eax
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sub rcx, rdi
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and rcx, 15
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mov r8, rdi
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jz .0
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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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.0:
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mov rcx, rdx
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and edx, 15
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shr rcx, 4
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jz @ZeroBytes
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pxor xmm0, xmm0
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.1:
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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 .1
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mfence
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@ZeroBytes:
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mov ecx, edx
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rep stosb
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mov rax, r8
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pop rdi
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ret
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