| #------------------------------------------------------------------------------ | |
| # | |
| # Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR> | |
| # 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: | |
| # | |
| #------------------------------------------------------------------------------ | |
| ASM_GLOBAL ASM_PFX(InternalMemCopyMem) | |
| #------------------------------------------------------------------------------ | |
| # VOID * | |
| # EFIAPI | |
| # InternalMemCopyMem ( | |
| # IN VOID *Destination, | |
| # IN VOID *Source, | |
| # IN UINTN Count | |
| # ); | |
| #------------------------------------------------------------------------------ | |
| ASM_PFX(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 |