diff options
Diffstat (limited to 'EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseMemoryLib/X64/CopyMem.S')
-rw-r--r-- | EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseMemoryLib/X64/CopyMem.S | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseMemoryLib/X64/CopyMem.S b/EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseMemoryLib/X64/CopyMem.S new file mode 100644 index 0000000000..fe67040ff6 --- /dev/null +++ b/EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseMemoryLib/X64/CopyMem.S @@ -0,0 +1,67 @@ +# +# ConvertAsm.py: Automatically generated from CopyMem.asm +# +#------------------------------------------------------------------------------ +# +# 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.S +# +# Abstract: +# +# CopyMem function +# +# Notes: +# +#------------------------------------------------------------------------------ + + +#------------------------------------------------------------------------------ +# VOID * +# EFIAPI +# InternalMemCopyMem ( +# IN VOID *Destination, +# IN VOID *Source, +# IN UINTN Count +# ) +#------------------------------------------------------------------------------ +.intel_syntax +.globl _InternalMemCopyMem +_InternalMemCopyMem: + push rsi + push rdi + mov rsi, rdx # rsi <- Source + mov rdi, rcx # rdi <- Destination + lea r9, [rsi + r8 - 1] # r9 <- End of Source + cmp rsi, rdi + mov rax, rdi # rax <- Destination as return value + jae _InternalMemCopyMem_al_0000 + cmp r9, rdi + jae _atSym_CopyBackward # Copy backward if overlapped +_InternalMemCopyMem_al_0000: + mov rcx, r8 + and r8, 7 + shr rcx, 3 + rep movsq # Copy as many Qwords as possible + jmp _atSym_CopyBytes +_atSym_CopyBackward: + mov rsi, r9 # rsi <- End of Source + lea rdi, [rdi + r8 - 1] # esi <- End of Destination + std # set direction flag +_atSym_CopyBytes: + mov rcx, r8 + rep movsb # Copy bytes backward + cld + pop rdi + pop rsi + ret + |