1 # 2 # ConvertAsm.py: Automatically generated from CopyMem.asm 3 # 4 #------------------------------------------------------------------------------ 5 # 6 # Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR> 7 # This program and the accompanying materials 8 # are licensed and made available under the terms and conditions of the BSD License 9 # which accompanies this distribution. The full text of the license may be found at 10 # http://opensource.org/licenses/bsd-license.php. 11 # 12 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 13 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 14 # 15 # Module Name: 16 # 17 # CopyMem.S 18 # 19 # Abstract: 20 # 21 # CopyMem function 22 # 23 # Notes: 24 # 25 #------------------------------------------------------------------------------ 26 27 28 #------------------------------------------------------------------------------ 29 # VOID * 30 # EFIAPI 31 # InternalMemCopyMem ( 32 # IN VOID *Destination, 33 # IN VOID *Source, 34 # IN UINTN Count 35 # ) 36 #------------------------------------------------------------------------------ 37 ASM_GLOBAL ASM_PFX(InternalMemCopyMem) 38 ASM_PFX(InternalMemCopyMem): 39 pushq %rsi 40 pushq %rdi 41 movq %rdx, %rsi # rsi <- Source 42 movq %rcx, %rdi # rdi <- Destination 43 leaq -1(%rsi, %r8,), %r9 # r9 <- End of Source 44 cmpq %rdi, %rsi 45 movq %rdi, %rax # rax <- Destination as return value 46 jae L0 47 cmpq %rdi, %r9 48 jae L_CopyBackward # Copy backward if overlapped 49 L0: 50 movq %r8, %rcx 51 andq $7, %r8 52 shrq $3, %rcx # rcx <- # of Qwords to copy 53 jz L_CopyBytes 54 movd %mm0, %r10 # (Save mm0 in r10) 55 L1: 56 movq (%rsi), %mm0 57 movntq %mm0, (%rdi) 58 addq $8, %rsi 59 addq $8, %rdi 60 loop L1 61 mfence 62 movd %r10, %mm0 # (Restore mm0) 63 jmp L_CopyBytes 64 L_CopyBackward: 65 movq %r9, %rsi # rsi <- End of Source 66 leaq -1(%rdi, %r8,), %rdi # rdi <- End of Destination 67 std # set direction flag 68 L_CopyBytes: 69 movq %r8, %rcx 70 rep movsb # Copy bytes backward 71 cld 72 popq %rdi 73 popq %rsi 74 ret 75
