mirror of https://github.com/acidanthera/audk.git
71 lines
2.4 KiB
NASM
71 lines
2.4 KiB
NASM
|
;------------------------------------------------------------------------------
|
||
|
|
;
|
||
|
|
; Copyright (c) 2006, Intel Corporation
|
||
|
|
; All rights reserved. This program and the accompanying materials
|
||
|
|
; are licensed and made available under the terms and conditions of the BSD License
|
||
|
|
; which accompanies this distribution. The full text of the license may be found at
|
||
|
|
; http://opensource.org/licenses/bsd-license.php
|
||
|
|
;
|
||
|
|
; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
|
||
|
|
; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
|
||
|
|
;
|
||
|
|
; Module Name:
|
||
|
|
;
|
||
|
|
; CopyMem.asm
|
||
|
|
;
|
||
|
|
; Abstract:
|
||
|
|
;
|
||
|
|
; CopyMem function
|
||
|
|
;
|
||
|
|
; Notes:
|
||
|
|
;
|
||
|
|
;------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
.code
|
||
|
|
|
||
|
;------------------------------------------------------------------------------
|
||
|
|
; VOID *
|
||
|
|
; EFIAPI
|
||
|
|
; InternalMemCopyMem (
|
||
|
|
; OUT VOID *DestinationBuffer,
|
||
|
|
; IN CONST VOID *SourceBuffer,
|
||
|
|
; IN UINTN Length
|
||
|
|
; );
|
||
|
|
;------------------------------------------------------------------------------
|
||
|
|
InternalMemCopyMem PROC USES rsi rdi
|
||
|
|
mov rsi, rdx ; rsi <- Source
|
||
|
|
mov rdi, rcx ; rdi <- Destination
|
||
|
|
lea r9, [rsi + r8 - 1] ; r9 <- End of Source
|
||
|
|
cmp rsi, rdi
|
||
|
|
mov rax, rdi ; rax <- Destination as return value
|
||
|
|
jae @F
|
||
|
|
cmp r9, rdi
|
||
|
|
jae @CopyBackward ; Copy backward if overlapped
|
||
|
|
@@:
|
||
|
|
mov rcx, r8
|
||
|
|
and r8, 7
|
||
|
|
shr rcx, 3 ; rcx <- # of Qwords to copy
|
||
|
|
jz @CopyBytes
|
||
|
|
DB 49h, 0fh, 7eh, 0c2h ; movd r10, mm0 (Save mm0 in r10)
|
||
|
|
@@:
|
||
|
|
DB 0fh, 6fh, 06h ; movd mm0, [rsi]
|
||
|
|
DB 0fh, 0e7h, 07h ; movntq [rdi], mm0
|
||
|
|
add rsi, 8
|
||
|
|
add rdi, 8
|
||
|
|
loop @B
|
||
|
|
mfence
|
||
|
|
DB 49h, 0fh, 6eh, 0c2h ; movd mm0, r10 (Restore mm0)
|
||
|
|
jmp @CopyBytes
|
||
|
|
@CopyBackward:
|
||
|
|
mov rsi, r9 ; rsi <- End of Source
|
||
|
|
lea rdi, [rdi + r8 - 1] ; rdi <- End of Destination
|
||
|
|
std ; set direction flag
|
||
|
|
@CopyBytes:
|
||
|
|
mov rcx, r8
|
||
|
|
rep movsb ; Copy bytes backward
|
||
|
|
cld
|
||
|
|
ret
|
||
|
|
InternalMemCopyMem ENDP
|
||
|
|
|
||
|
|
END
|