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1 | /** @file\r | |
2 | CopyMem() implementation.\r | |
3 | \r | |
4 | The following BaseMemoryLib instances contain the same copy of this file:\r | |
5 | \r | |
6 | BaseMemoryLib\r | |
7 | BaseMemoryLibMmx\r | |
8 | BaseMemoryLibSse2\r | |
9 | BaseMemoryLibRepStr\r | |
10 | BaseMemoryLibOptDxe\r | |
11 | BaseMemoryLibOptPei\r | |
12 | PeiMemoryLib\r | |
13 | UefiMemoryLib\r | |
14 | \r | |
15 | Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r | |
16 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
17 | \r | |
18 | **/\r | |
19 | \r | |
20 | #include "MemLibInternals.h"\r | |
21 | \r | |
22 | /**\r | |
23 | Copies a source buffer to a destination buffer, and returns the destination buffer.\r | |
24 | \r | |
25 | This function copies Length bytes from SourceBuffer to DestinationBuffer, and returns\r | |
26 | DestinationBuffer. The implementation must be reentrant, and it must handle the case\r | |
27 | where SourceBuffer overlaps DestinationBuffer.\r | |
28 | \r | |
29 | If Length is greater than (MAX_ADDRESS - DestinationBuffer + 1), then ASSERT().\r | |
30 | If Length is greater than (MAX_ADDRESS - SourceBuffer + 1), then ASSERT().\r | |
31 | \r | |
32 | @param DestinationBuffer The pointer to the destination buffer of the memory copy.\r | |
33 | @param SourceBuffer The pointer to the source buffer of the memory copy.\r | |
34 | @param Length The number of bytes to copy from SourceBuffer to DestinationBuffer.\r | |
35 | \r | |
36 | @return DestinationBuffer.\r | |
37 | \r | |
38 | **/\r | |
39 | VOID *\r | |
40 | EFIAPI\r | |
41 | CopyMem (\r | |
42 | OUT VOID *DestinationBuffer,\r | |
43 | IN CONST VOID *SourceBuffer,\r | |
44 | IN UINTN Length\r | |
45 | )\r | |
46 | {\r | |
47 | if (Length == 0) {\r | |
48 | return DestinationBuffer;\r | |
49 | }\r | |
50 | \r | |
51 | ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)DestinationBuffer));\r | |
52 | ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)SourceBuffer));\r | |
53 | \r | |
54 | if (DestinationBuffer == SourceBuffer) {\r | |
55 | return DestinationBuffer;\r | |
56 | }\r | |
57 | \r | |
58 | return InternalMemCopyMem (DestinationBuffer, SourceBuffer, Length);\r | |
59 | }\r |