diff options
Diffstat (limited to 'src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseMemoryLibOptDxe/CopyMemWrapper.c')
-rw-r--r-- | src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseMemoryLibOptDxe/CopyMemWrapper.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseMemoryLibOptDxe/CopyMemWrapper.c b/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseMemoryLibOptDxe/CopyMemWrapper.c new file mode 100644 index 00000000..9db53b0b --- /dev/null +++ b/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseMemoryLibOptDxe/CopyMemWrapper.c @@ -0,0 +1,57 @@ +/** @file + CopyMem() implementation. + + The following BaseMemoryLib instances contain the same copy of this file: + + BaseMemoryLib + BaseMemoryLibMmx + BaseMemoryLibSse2 + BaseMemoryLibRepStr + BaseMemoryLibOptDxe + BaseMemoryLibOptPei + PeiMemoryLib + UefiMemoryLib + + Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR> + SPDX-License-Identifier: BSD-2-Clause-Patent + +**/ + +#include "MemLibInternals.h" + +/** + Copies a source buffer to a destination buffer, and returns the destination buffer. + + This function copies Length bytes from SourceBuffer to DestinationBuffer, and returns + DestinationBuffer. The implementation must be reentrant, and it must handle the case + where SourceBuffer overlaps DestinationBuffer. + + If Length is greater than (MAX_ADDRESS - DestinationBuffer + 1), then ASSERT(). + If Length is greater than (MAX_ADDRESS - SourceBuffer + 1), then ASSERT(). + + @param DestinationBuffer The pointer to the destination buffer of the memory copy. + @param SourceBuffer The pointer to the source buffer of the memory copy. + @param Length The number of bytes to copy from SourceBuffer to DestinationBuffer. + + @return DestinationBuffer. + +**/ +VOID * +EFIAPI +CopyMem ( + OUT VOID *DestinationBuffer, + IN CONST VOID *SourceBuffer, + IN UINTN Length + ) +{ + if (Length == 0) { + return DestinationBuffer; + } + ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)DestinationBuffer)); + ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)SourceBuffer)); + + if (DestinationBuffer == SourceBuffer) { + return DestinationBuffer; + } + return InternalMemCopyMem (DestinationBuffer, SourceBuffer, Length); +} |