1 ;------------------------------------------------------------------------------
3 ; Copyright (c) 2006, 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.
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.
22 ;------------------------------------------------------------------------------
27 ;------------------------------------------------------------------------------
30 ; InternalMemCopyMem (
31 ; IN VOID *Destination,
35 ;------------------------------------------------------------------------------
36 global ASM_PFX(InternalMemCopyMem)
37 ASM_PFX(InternalMemCopyMem):
40 mov rsi, rdx ; rsi <- Source
41 mov rdi, rcx ; rdi <- Destination
42 lea r9, [rsi + r8 - 1] ; r9 <- End of Source
44 mov rax, rdi ; rax <- Destination as return value
47 jae @CopyBackward ; Copy backward if overlapped
52 rep movsq ; Copy as many Qwords as possible
55 mov rsi, r9 ; rsi <- End of Source
56 lea rdi, [rdi + r8 - 1] ; esi <- End of Destination
57 std ; set direction flag
60 rep movsb ; Copy bytes backward