mirror of https://github.com/acidanthera/audk.git
59 lines
1.7 KiB
NASM
59 lines
1.7 KiB
NASM
;------------------------------------------------------------------------------
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;
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; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
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; 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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; CompareMem.Asm
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;
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; Abstract:
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;
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; CompareMem function
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;
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; Notes:
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;
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; The following BaseMemoryLib instances contain the same copy of this file:
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;
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; BaseMemoryLibRepStr
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; BaseMemoryLibMmx
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; BaseMemoryLibSse2
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; BaseMemoryLibOptDxe
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; BaseMemoryLibOptPei
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;
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;------------------------------------------------------------------------------
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DEFAULT REL
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SECTION .text
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;------------------------------------------------------------------------------
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; INTN
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; EFIAPI
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; InternalMemCompareMem (
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; IN CONST 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 ASM_PFX(InternalMemCompareMem)
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ASM_PFX(InternalMemCompareMem):
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push rsi
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push rdi
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mov rsi, rcx
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mov rdi, rdx
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mov rcx, r8
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repe cmpsb
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movzx rax, byte [rsi - 1]
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movzx rdx, byte [rdi - 1]
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sub rax, rdx
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pop rdi
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pop rsi
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ret
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