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 ; OUT VOID *DestinationBuffer, 31 ; IN CONST VOID *SourceBuffer, 32 ; IN UINTN Length 33 ; ); 34 ;------------------------------------------------------------------------------ 35 InternalMemCopyMem 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 ; rcx <- # of Qwords to copy 48 jz @CopyBytes 49 DB 49h, 0fh, 7eh, 0c2h ; movd r10, mm0 (Save mm0 in r10) 50 @@: 51 DB 0fh, 6fh, 06h ; movd mm0, [rsi] 52 DB 0fh, 0e7h, 07h ; movntq [rdi], mm0 53 add rsi, 8 54 add rdi, 8 55 loop @B 56 mfence 57 DB 49h, 0fh, 6eh, 0c2h ; movd mm0, r10 (Restore mm0) 58 jmp @CopyBytes 59 @CopyBackward: 60 mov rsi, r9 ; rsi <- End of Source 61 lea rdi, [rdi + r8 - 1] ; rdi <- End of Destination 62 std ; set direction flag 63 @CopyBytes: 64 mov rcx, r8 65 rep movsb ; Copy bytes backward 66 cld 67 ret 68 InternalMemCopyMem ENDP 69 70 END 71
