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https://github.com/CloverHackyColor/CloverBootloader.git
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57 lines
1.5 KiB
NASM
57 lines
1.5 KiB
NASM
;------------------------------------------------------------------------------
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;
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; Copyright (c) 2006 - 2008, 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.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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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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; 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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global ASM_PFX(InternalMemSetMem)
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ASM_PFX(InternalMemSetMem):
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push rdi
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push rbx
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push rcx ; push Buffer
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mov rax, r8 ; rax = Value
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and rax, 0xff ; rax = lower 8 bits of r8, upper 56 bits are 0
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mov ah, al ; ah = al
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mov bx, ax ; bx = ax
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shl rax, 0x10 ; rax = ax << 16
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mov ax, bx ; ax = bx
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mov rbx, rax ; ebx = eax
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shl rax, 0x20 ; rax = rax << 32
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or rax, rbx ; eax = ebx
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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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cld
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rep stosq
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mov rcx, rdx ; rcx = rdx
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and rcx, 7 ; rcx = rcx & 7
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rep stosb
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pop rax ; rax = Buffer
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pop rbx
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pop rdi
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ret
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