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Diffstat (limited to '')
| -rw-r--r-- | src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseMemoryLibOptDxe/X64/CompareMem.nasm | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseMemoryLibOptDxe/X64/CompareMem.nasm b/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseMemoryLibOptDxe/X64/CompareMem.nasm new file mode 100644 index 00000000..e367c494 --- /dev/null +++ b/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseMemoryLibOptDxe/X64/CompareMem.nasm @@ -0,0 +1,52 @@ +;------------------------------------------------------------------------------ +; +; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR> +; SPDX-License-Identifier: BSD-2-Clause-Patent +; +; Module Name: +; +; CompareMem.Asm +; +; Abstract: +; +; CompareMem function +; +; Notes: +; +; The following BaseMemoryLib instances contain the same copy of this file: +; +; BaseMemoryLibRepStr +; BaseMemoryLibMmx +; BaseMemoryLibSse2 +; BaseMemoryLibOptDxe +; BaseMemoryLibOptPei +; +;------------------------------------------------------------------------------ + + DEFAULT REL + SECTION .text + +;------------------------------------------------------------------------------ +; INTN +; EFIAPI +; InternalMemCompareMem ( +; IN CONST VOID *DestinationBuffer, +; IN CONST VOID *SourceBuffer, +; IN UINTN Length +; ); +;------------------------------------------------------------------------------ +global ASM_PFX(InternalMemCompareMem) +ASM_PFX(InternalMemCompareMem): + push rsi + push rdi + mov rsi, rcx + mov rdi, rdx + mov rcx, r8 + repe cmpsb + movzx rax, byte [rsi - 1] + movzx rdx, byte [rdi - 1] + sub rax, rdx + pop rdi + pop rsi + ret + |