mirror of https://github.com/acidanthera/audk.git
73 lines
2.0 KiB
ArmAsm
73 lines
2.0 KiB
ArmAsm
|
#------------------------------------------------------------------------------
|
||
|
|
#
|
||
|
|
# 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:
|
||
|
|
#
|
||
|
|
#------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
|
||
|
|
#------------------------------------------------------------------------------
|
||
|
|
# VOID *
|
||
|
|
# EFIAPI
|
||
|
|
# InternalMemCopyMem (
|
||
|
|
# OUT VOID *DestinationBuffer,
|
||
|
|
# IN CONST VOID *SourceBuffer,
|
||
|
|
# IN UINTN Length
|
||
|
|
# );
|
||
|
|
#------------------------------------------------------------------------------
|
||
|
|
.global _InternalMemCopyMem;
|
||
|
|
_InternalMemCopyMem:
|
||
|
|
push %rsi
|
||
|
|
push %rdi
|
||
|
|
mov %rdi, %rsi
|
||
|
|
mov %rcx, %rdi
|
||
|
|
lea -1(%r8,%rsi,1),%r9
|
||
|
|
cmp %rdi, %rsi
|
||
|
|
mov %rdi, %rax
|
||
|
|
jae L1
|
||
|
|
cmp %rdi, %r9
|
||
|
|
jae LCopyBackward # Copy backward if overlapped
|
||
|
|
L1:
|
||
|
|
mov %r8, %rcx
|
||
|
|
and $7, %r8
|
||
|
|
shr $3, %rcx
|
||
|
|
jz LCopyBytes
|
||
|
|
movd %mm0, %r10 # (Save mm0 in r10)
|
||
|
|
L2:
|
||
|
|
movd (%rsi), %mm0
|
||
|
|
movntq %mm0, (%rdi)
|
||
|
|
add $8, %rsi
|
||
|
|
add $8, %rdi
|
||
|
|
loop L2
|
||
|
|
mfence
|
||
|
|
movd %r10, %mm0 #(Restore mm0)
|
||
|
|
jmp LCopyBytes
|
||
|
|
LCopyBackward:
|
||
|
|
mov %r9, %rsi
|
||
|
|
lea -1(%r8,%rdi,1),%rdi
|
||
|
|
std # set direction flag
|
||
|
|
LCopyBytes:
|
||
|
|
mov %r8, %rcx
|
||
|
|
rep
|
||
|
|
movsb # Copy bytes backward
|
||
|
|
cld
|
||
|
|
pop %rdi
|
||
|
|
pop %rsi
|
||
|
|
ret
|