1;------------------------------------------------------------------------------ 2; 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. 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; CopyMem.Asm 15; 16; Abstract: 17; 18; CopyMem function 19; 20; Notes: 21; 22;------------------------------------------------------------------------------ 23 24 .code 25 26;------------------------------------------------------------------------------ 27; VOID * 28; EFIAPI 29; InternalMemCopyMem ( 30; IN VOID *Destination, 31; IN VOID *Source, 32; IN UINTN Count 33; ) 34;------------------------------------------------------------------------------ 35InternalMemCopyMem PROC USES rsi rdi 36 mov rsi, rdx ; rsi <- Source 37 mov rdi, rcx ; rdi <- Destination 38 lea r9, [rsi + r8 - 1] ; r9 <- End of Source 39 cmp rsi, rdi 40 mov rax, rdi ; rax <- Destination as return value 41 jae @F 42 cmp r9, rdi 43 jae @CopyBackward ; Copy backward if overlapped 44@@: 45 mov rcx, r8 46 and r8, 7 47 shr rcx, 3 48 rep movsq ; Copy as many Qwords as possible 49 jmp @CopyBytes 50@CopyBackward: 51 mov rsi, r9 ; rsi <- End of Source 52 lea rdi, [rdi + r8 - 1] ; esi <- End of Destination 53 std ; set direction flag 54@CopyBytes: 55 mov rcx, r8 56 rep movsb ; Copy bytes backward 57 cld 58 ret 59InternalMemCopyMem ENDP 60 61 END 62