1 #------------------------------------------------------------------------------ 2 # 3 # Copyright (c) 2006, Intel Corporation. All rights reserved.<BR> 4 # This program and the accompanying materials 5 # are licensed and made available under the terms and conditions of the BSD License 6 # which accompanies this distribution. The full text of the license may be found at 7 # http://opensource.org/licenses/bsd-license.php. 8 # 9 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 10 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 11 # 12 # Module Name: 13 # 14 # CopyMem.asm 15 # 16 # Abstract: 17 # 18 # CopyMem function 19 # 20 # Notes: 21 # 22 #------------------------------------------------------------------------------ 23 24 ASM_GLOBAL ASM_PFX(InternalMemCopyMem) 25 26 #------------------------------------------------------------------------------ 27 # VOID * 28 # EFIAPI 29 # InternalMemCopyMem ( 30 # IN VOID *Destination, 31 # IN VOID *Source, 32 # IN UINTN Count 33 # ); 34 #------------------------------------------------------------------------------ 35 ASM_PFX(InternalMemCopyMem): 36 push %esi 37 push %edi 38 movl 16(%esp), %esi # esi <- Source 39 movl 12(%esp), %edi # edi <- Destination 40 movl 20(%esp), %edx # edx <- Count 41 leal -1(%esi,%edx,), %eax # eax <- End of Source 42 cmpl %edi, %esi 43 jae L0 44 cmpl %edi, %eax # Overlapped? 45 jae L_CopyBackward # Copy backward if overlapped 46 L0: 47 xorl %ecx, %ecx 48 subl %esi, %ecx 49 andl $7, %ecx # ecx + esi aligns on 8-byte boundary 50 jz L1 51 cmpl %edx, %ecx 52 cmova %edx, %ecx 53 subl %ecx, %edx # edx <- remaining bytes to copy 54 rep 55 movsb 56 L1: 57 movl %edx, %ecx 58 andl $7, %edx 59 shrl $3, %ecx # ecx <- # of Qwords to copy 60 jz L_CopyBytes 61 pushl %eax 62 pushl %eax 63 movq %mm0, (%esp) # save mm0 64 L2: 65 movq (%esi), %mm0 66 movq %mm0, (%edi) 67 addl $8, %esi 68 addl $8, %edi 69 loop L2 70 movq (%esp), %mm0 # restore mm0 71 popl %ecx # stack cleanup 72 popl %ecx # stack cleanup 73 jmp L_CopyBytes 74 L_CopyBackward: 75 movl %eax, %esi # esi <- Last byte in Source 76 leal -1(%edi,%edx,), %edi # edi <- Last byte in Destination 77 std 78 L_CopyBytes: 79 movl %edx, %ecx 80 rep 81 movsb 82 cld 83 movl 12(%esp), %eax 84 pop %edi 85 pop %esi 86 ret 87
