1;------------------------------------------------------------------------------ 2; 3; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR> 4; This program and the accompanying materials 5; are licensed and made available under the terms and conditions of the BSD License 6; which accompanies this distribution. The full text of the license may be found at 7; http://opensource.org/licenses/bsd-license.php. 8; 9; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 10; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 11; 12; Module Name: 13; 14; CompareMem.Asm 15; 16; Abstract: 17; 18; CompareMem function 19; 20; Notes: 21; 22; The following BaseMemoryLib instances contain the same copy of this file: 23; 24; BaseMemoryLibRepStr 25; BaseMemoryLibMmx 26; BaseMemoryLibSse2 27; BaseMemoryLibOptDxe 28; BaseMemoryLibOptPei 29; 30;------------------------------------------------------------------------------ 31 32 DEFAULT REL 33 SECTION .text 34 35;------------------------------------------------------------------------------ 36; INTN 37; EFIAPI 38; InternalMemCompareMem ( 39; IN CONST VOID *DestinationBuffer, 40; IN CONST VOID *SourceBuffer, 41; IN UINTN Length 42; ); 43;------------------------------------------------------------------------------ 44global ASM_PFX(InternalMemCompareMem) 45ASM_PFX(InternalMemCompareMem): 46 push rsi 47 push rdi 48 mov rsi, rcx 49 mov rdi, rdx 50 mov rcx, r8 51 repe cmpsb 52 movzx rax, byte [rsi - 1] 53 movzx rdx, byte [rdi - 1] 54 sub rax, rdx 55 pop rdi 56 pop rsi 57 ret 58 59