1 ;------------------------------------------------------------------------------ 2 ; 3 ; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR> 4 ; This program and the accompanying materials 5 ; are licensed and made available under the terms and conditions of the BSD License 6 ; which accompanies this distribution. The full text of the license may be found at 7 ; http://opensource.org/licenses/bsd-license.php. 8 ; 9 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 10 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 11 ; 12 ; Module Name: 13 ; 14 ; SetMem.Asm 15 ; 16 ; Abstract: 17 ; 18 ; SetMem function 19 ; 20 ; Notes: 21 ; 22 ;------------------------------------------------------------------------------ 23 24 DEFAULT REL 25 SECTION .text 26 27 ;------------------------------------------------------------------------------ 28 ; VOID * 29 ; EFIAPI 30 ; InternalMemSetMem ( 31 ; IN VOID *Buffer, 32 ; IN UINTN Count, 33 ; IN UINT8 Value 34 ; ) 35 ;------------------------------------------------------------------------------ 36 global ASM_PFX(InternalMemSetMem) 37 ASM_PFX(InternalMemSetMem): 38 push rdi 39 push rbx 40 push rcx ; push Buffer 41 mov rax, r8 ; rax = Value 42 and rax, 0xff ; rax = lower 8 bits of r8, upper 56 bits are 0 43 mov ah, al ; ah = al 44 mov bx, ax ; bx = ax 45 shl rax, 0x10 ; rax = ax << 16 46 mov ax, bx ; ax = bx 47 mov rbx, rax ; ebx = eax 48 shl rax, 0x20 ; rax = rax << 32 49 or rax, rbx ; eax = ebx 50 mov rdi, rcx ; rdi = Buffer 51 mov rcx, rdx ; rcx = Count 52 shr rcx, 3 ; rcx = rcx / 8 53 cld 54 rep stosq 55 mov rcx, rdx ; rcx = rdx 56 and rcx, 7 ; rcx = rcx & 7 57 rep stosb 58 pop rax ; rax = Buffer 59 pop rbx 60 pop rdi 61 ret 62 63
