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#------------------------------------------------------------------------------
#
# 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
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