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https://github.com/CloverHackyColor/CloverBootloader.git
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50 lines
1.3 KiB
NASM
50 lines
1.3 KiB
NASM
;------------------------------------------------------------------------------
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;
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; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
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; SPDX-License-Identifier: BSD-2-Clause-Patent
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;
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; Module Name:
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;
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; ScanMem8.Asm
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;
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; Abstract:
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;
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; ScanMem8 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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; CONST VOID *
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; EFIAPI
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; InternalMemScanMem8 (
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; IN CONST VOID *Buffer,
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; IN UINTN Length,
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; IN UINT8 Value
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; );
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;------------------------------------------------------------------------------
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global ASM_PFX(InternalMemScanMem8)
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ASM_PFX(InternalMemScanMem8):
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push rdi
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mov rdi, rcx
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mov rcx, rdx
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mov rax, r8
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repne scasb
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lea rax, [rdi - 1]
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cmovnz rax, rcx ; set rax to 0 if not found
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pop rdi
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ret
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