| #------------------------------------------------------------------------------ |
| # |
| # 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 |
