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https://github.com/CloverHackyColor/CloverBootloader.git
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55 lines
1.4 KiB
NASM
55 lines
1.4 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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; SetMem.nasm
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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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DEFAULT REL
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SECTION .text
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;------------------------------------------------------------------------------
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; VOID *
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; EFIAPI
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; InternalMemSetMem(
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; OUT VOID *Buffer,
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; IN UINTN Length,
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; IN UINT8 Value
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; );
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;------------------------------------------------------------------------------
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global ASM_PFX(InternalMemSetMem)
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ASM_PFX(InternalMemSetMem):
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push rdi
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mov rax, r8
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mov ah, al
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DB 0x48, 0xf, 0x6e, 0xc0 ; movd mm0, rax
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mov r8, rcx
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mov rdi, r8 ; rdi <- Buffer
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mov rcx, rdx
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and edx, 7
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shr rcx, 3
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jz @SetBytes
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DB 0xf, 0x70, 0xC0, 0x0 ; pshufw mm0, mm0, 0h
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.0:
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DB 0xf, 0xe7, 0x7 ; movntq [rdi], mm0
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add rdi, 8
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loop .0
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mfence
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@SetBytes:
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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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