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| ;------------------------------------------------------------------------------
| ;
| ; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
| ; SPDX-License-Identifier: BSD-2-Clause-Patent
| ;
| ; Module Name:
| ;
| ; SetMem.Asm
| ;
| ; Abstract:
| ;
| ; SetMem function
| ;
| ; Notes:
| ;
| ;------------------------------------------------------------------------------
|
| DEFAULT REL
| SECTION .text
|
| ;------------------------------------------------------------------------------
| ; VOID *
| ; EFIAPI
| ; InternalMemSetMem (
| ; IN VOID *Buffer,
| ; IN UINTN Count,
| ; IN UINT8 Value
| ; )
| ;------------------------------------------------------------------------------
| global ASM_PFX(InternalMemSetMem)
| ASM_PFX(InternalMemSetMem):
| push rdi
| push rbx
| push rcx ; push Buffer
| mov rax, r8 ; rax = Value
| and rax, 0xff ; rax = lower 8 bits of r8, upper 56 bits are 0
| mov ah, al ; ah = al
| mov bx, ax ; bx = ax
| shl rax, 0x10 ; rax = ax << 16
| mov ax, bx ; ax = bx
| mov rbx, rax ; ebx = eax
| shl rax, 0x20 ; rax = rax << 32
| or rax, rbx ; eax = ebx
| mov rdi, rcx ; rdi = Buffer
| mov rcx, rdx ; rcx = Count
| shr rcx, 3 ; rcx = rcx / 8
| cld
| rep stosq
| mov rcx, rdx ; rcx = rdx
| and rcx, 7 ; rcx = rcx & 7
| rep stosb
| pop rax ; rax = Buffer
| pop rbx
| pop rdi
| ret
|
|
|
