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 ; OUT VOID *DestinationBuffer,
32 ; IN CONST VOID *SourceBuffer,
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
51 shr rcx, 3 ; rcx <- # of Qwords to copy
53 DB 0x49, 0xf, 0x7e, 0xc2 ; movd r10, mm0 (Save mm0 in r10)
55 DB 0xf, 0x6f, 0x6 ; movd mm0, [rsi]
56 DB 0xf, 0xe7, 0x7 ; movntq [rdi], mm0
61 DB 0x49, 0xf, 0x6e, 0xc2 ; movd mm0, r10 (Restore mm0)
64 mov rsi, r9 ; rsi <- End of Source
65 lea rdi, [rdi + r8 - 1] ; rdi <- End of Destination
66 std ; set direction flag
69 rep movsb ; Copy bytes backward