| #------------------------------------------------------------------------------ |
| # |
| # 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: |
| # |
| #------------------------------------------------------------------------------ |
| |
| .globl _InternalMemCopyMem |
| |
| #------------------------------------------------------------------------------ |
| # VOID * |
| # EFIAPI |
| # InternalMemCopyMem ( |
| # IN VOID *Destination, |
| # IN VOID *Source, |
| # IN UINTN Count |
| # ); |
| #------------------------------------------------------------------------------ |
| _InternalMemCopyMem: |
| push %esi |
| push %edi |
| movl 16(%esp), %esi # esi <- Source |
| movl 12(%esp), %edi # edi <- Destination |
| movl 20(%esp), %edx # edx <- Count |
| leal -1(%esi, %edx), %eax # eax <- End of Source |
| cmpl %edi, %esi |
| jae L0 |
| cmpl %edi, %eax |
| jae L_CopyBackward # Copy backward if overlapped |
| L0: |
| movl %edx, %ecx |
| andl $3, %edx |
| shrl $2, %ecx |
| rep |
| movsl # Copy as many Dwords as possible |
| jmp L_CopyBytes |
| L_CopyBackward: |
| movl %eax, %esi # esi <- End of Source |
| leal -1(%edi, %edx), %edi # edi <- End of Destination |
| std |
| L_CopyBytes: |
| movl %edx, %ecx |
| rep |
| movsb # Copy bytes backward |
| cld |
| movl 12(%esp), %eax # eax <- Destination as return value |
| pop %edi |
| pop %esi |
| ret |
