mirror of https://github.com/acidanthera/audk.git
73 lines
2.0 KiB
ArmAsm
73 lines
2.0 KiB
ArmAsm
#------------------------------------------------------------------------------
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#
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# Copyright (c) 2006, Intel Corporation
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# All rights reserved. This program and the accompanying materials
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# are licensed and made available under the terms and conditions of the BSD License
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# which accompanies this distribution. The full text of the license may be found at
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# http://opensource.org/licenses/bsd-license.php
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#
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# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#
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# Module Name:
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#
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# CopyMem.asm
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#
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# Abstract:
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#
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# CopyMem function
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#
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# Notes:
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#
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#------------------------------------------------------------------------------
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#------------------------------------------------------------------------------
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# VOID *
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# EFIAPI
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# InternalMemCopyMem (
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# OUT VOID *DestinationBuffer,
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# IN CONST VOID *SourceBuffer,
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# IN UINTN Length
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# );
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#------------------------------------------------------------------------------
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.global _InternalMemCopyMem;
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_InternalMemCopyMem:
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push %rsi
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push %rdi
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mov %rdi, %rsi
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mov %rcx, %rdi
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lea -1(%r8,%rsi,1),%r9
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cmp %rdi, %rsi
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mov %rdi, %rax
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jae L1
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cmp %rdi, %r9
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jae LCopyBackward # Copy backward if overlapped
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L1:
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mov %r8, %rcx
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and $7, %r8
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shr $3, %rcx
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jz LCopyBytes
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movd %mm0, %r10 # (Save mm0 in r10)
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L2:
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movd (%rsi), %mm0
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movntq %mm0, (%rdi)
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add $8, %rsi
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add $8, %rdi
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loop L2
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mfence
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movd %r10, %mm0 #(Restore mm0)
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jmp LCopyBytes
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LCopyBackward:
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mov %r9, %rsi
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lea -1(%r8,%rdi,1),%rdi
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std # set direction flag
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LCopyBytes:
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mov %r8, %rcx
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rep
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movsb # Copy bytes backward
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cld
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pop %rdi
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pop %rsi
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ret
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