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https://github.com/CloverHackyColor/CloverBootloader.git
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45 lines
1.1 KiB
NASM
45 lines
1.1 KiB
NASM
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;------------------------------------------------------------------------------
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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.Asm
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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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push rcx ; push Buffer
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xor rax, rax ; rax = 0
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mov rdi, rcx ; rdi = Buffer
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mov rcx, rdx ; rcx = Count
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shr rcx, 3 ; rcx = rcx / 8
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and rdx, 7 ; rdx = rdx & 7
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cld
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rep stosq
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mov rcx, rdx ; rcx = rdx
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rep stosb
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pop rax ; rax = Buffer
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pop rdi
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ret
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