mirror of https://github.com/acidanthera/audk.git
67 lines
1.7 KiB
ArmAsm
67 lines
1.7 KiB
ArmAsm
#------------------------------------------------------------------------------
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#
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# Copyright (c) 2008, 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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# EfiCopyMemRep1.S
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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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#include <EfiBind.h>
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.code:
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.global ASM_PFX(EfiCommonLibCopyMem)
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#------------------------------------------------------------------------------
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# VOID
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# EfiCommonLibCopyMem (
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# OUT VOID *Destination,
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# IN VOID *Source,
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# IN UINTN Count
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# );
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#------------------------------------------------------------------------------
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ASM_PFX(EfiCommonLibCopyMem):
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push %rsi
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push %rdi
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cmp %rcx,%rdx
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je CopyMemDone
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cmp $0x0,%r8
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je CopyMemDone
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mov %rdx,%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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jae CopyBytes
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cmp %rdi,%r9
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jb CopyBytes
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mov %r9,%rsi
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lea -1(%r8,%rdi,1),%rdi
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std
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CopyBytes:
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mov %r8,%rcx
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rep movsb %ds:(%rsi),%es:(%rdi)
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cld
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CopyMemDone:
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pop %rdi
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pop %rsi
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retq
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