out into its own source file so that it can be excluded from a build for a\r
particular platform easily if an optimized version is desired.\r
\r
- Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>\r
- This program and the accompanying materials\r
- are licensed and made available under the terms and conditions of the BSD License\r
- which accompanies this distribution. The full text of the license may be found at\r
- http://opensource.org/licenses/bsd-license.php.\r
+ Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>\r
+ Copyright (c) 2012 - 2013, ARM Ltd. All rights reserved.<BR>\r
+ Copyright (c) 2016, Linaro Ltd. All rights reserved.<BR>\r
\r
- THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
- WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+ SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
-\r
-\r
-\r
#include "MemLibInternals.h"\r
\r
/**\r
VOID *\r
EFIAPI\r
InternalMemCopyMem (\r
- OUT VOID *DestinationBuffer,\r
- IN CONST VOID *SourceBuffer,\r
- IN UINTN Length\r
+ OUT VOID *DestinationBuffer,\r
+ IN CONST VOID *SourceBuffer,\r
+ IN UINTN Length\r
)\r
{\r
//\r
// volatile to prevent the optimizer from replacing this function with\r
// the intrinsic memcpy()\r
//\r
- volatile UINT8 *Destination8;\r
- CONST UINT8 *Source8;\r
-\r
- if (SourceBuffer > DestinationBuffer) {\r
- Destination8 = (UINT8*)DestinationBuffer;\r
- Source8 = (CONST UINT8*)SourceBuffer;\r
- while (Length-- != 0) {\r
- *(Destination8++) = *(Source8++);\r
+ volatile UINT8 *Destination8;\r
+ CONST UINT8 *Source8;\r
+ volatile UINT32 *Destination32;\r
+ CONST UINT32 *Source32;\r
+ volatile UINT64 *Destination64;\r
+ CONST UINT64 *Source64;\r
+ UINTN Alignment;\r
+\r
+ if ((((UINTN)DestinationBuffer & 0x7) == 0) && (((UINTN)SourceBuffer & 0x7) == 0) && (Length >= 8)) {\r
+ if (SourceBuffer > DestinationBuffer) {\r
+ Destination64 = (UINT64 *)DestinationBuffer;\r
+ Source64 = (CONST UINT64 *)SourceBuffer;\r
+ while (Length >= 8) {\r
+ *(Destination64++) = *(Source64++);\r
+ Length -= 8;\r
+ }\r
+\r
+ // Finish if there are still some bytes to copy\r
+ Destination8 = (UINT8 *)Destination64;\r
+ Source8 = (CONST UINT8 *)Source64;\r
+ while (Length-- != 0) {\r
+ *(Destination8++) = *(Source8++);\r
+ }\r
+ } else if (SourceBuffer < DestinationBuffer) {\r
+ Destination64 = (UINT64 *)((UINTN)DestinationBuffer + Length);\r
+ Source64 = (CONST UINT64 *)((UINTN)SourceBuffer + Length);\r
+\r
+ // Destination64 and Source64 were aligned on a 64-bit boundary\r
+ // but if length is not a multiple of 8 bytes then they won't be\r
+ // anymore.\r
+\r
+ Alignment = Length & 0x7;\r
+ if (Alignment != 0) {\r
+ Destination8 = (UINT8 *)Destination64;\r
+ Source8 = (CONST UINT8 *)Source64;\r
+\r
+ while (Alignment-- != 0) {\r
+ *(--Destination8) = *(--Source8);\r
+ --Length;\r
+ }\r
+\r
+ Destination64 = (UINT64 *)Destination8;\r
+ Source64 = (CONST UINT64 *)Source8;\r
+ }\r
+\r
+ while (Length > 0) {\r
+ *(--Destination64) = *(--Source64);\r
+ Length -= 8;\r
+ }\r
}\r
- } else if (SourceBuffer < DestinationBuffer) {\r
- Destination8 = (UINT8*)DestinationBuffer + Length;\r
- Source8 = (CONST UINT8*)SourceBuffer + Length;\r
- while (Length-- != 0) {\r
- *(--Destination8) = *(--Source8);\r
+ } else if ((((UINTN)DestinationBuffer & 0x3) == 0) && (((UINTN)SourceBuffer & 0x3) == 0) && (Length >= 4)) {\r
+ if (SourceBuffer > DestinationBuffer) {\r
+ Destination32 = (UINT32 *)DestinationBuffer;\r
+ Source32 = (CONST UINT32 *)SourceBuffer;\r
+ while (Length >= 4) {\r
+ *(Destination32++) = *(Source32++);\r
+ Length -= 4;\r
+ }\r
+\r
+ // Finish if there are still some bytes to copy\r
+ Destination8 = (UINT8 *)Destination32;\r
+ Source8 = (CONST UINT8 *)Source32;\r
+ while (Length-- != 0) {\r
+ *(Destination8++) = *(Source8++);\r
+ }\r
+ } else if (SourceBuffer < DestinationBuffer) {\r
+ Destination32 = (UINT32 *)((UINTN)DestinationBuffer + Length);\r
+ Source32 = (CONST UINT32 *)((UINTN)SourceBuffer + Length);\r
+\r
+ // Destination32 and Source32 were aligned on a 32-bit boundary\r
+ // but if length is not a multiple of 4 bytes then they won't be\r
+ // anymore.\r
+\r
+ Alignment = Length & 0x3;\r
+ if (Alignment != 0) {\r
+ Destination8 = (UINT8 *)Destination32;\r
+ Source8 = (CONST UINT8 *)Source32;\r
+\r
+ while (Alignment-- != 0) {\r
+ *(--Destination8) = *(--Source8);\r
+ --Length;\r
+ }\r
+\r
+ Destination32 = (UINT32 *)Destination8;\r
+ Source32 = (CONST UINT32 *)Source8;\r
+ }\r
+\r
+ while (Length > 0) {\r
+ *(--Destination32) = *(--Source32);\r
+ Length -= 4;\r
+ }\r
+ }\r
+ } else {\r
+ if (SourceBuffer > DestinationBuffer) {\r
+ Destination8 = (UINT8 *)DestinationBuffer;\r
+ Source8 = (CONST UINT8 *)SourceBuffer;\r
+ while (Length-- != 0) {\r
+ *(Destination8++) = *(Source8++);\r
+ }\r
+ } else if (SourceBuffer < DestinationBuffer) {\r
+ Destination8 = (UINT8 *)DestinationBuffer + (Length - 1);\r
+ Source8 = (CONST UINT8 *)SourceBuffer + (Length - 1);\r
+ while (Length-- != 0) {\r
+ *(Destination8--) = *(Source8--);\r
+ }\r
}\r
}\r
+\r
return DestinationBuffer;\r
}\r
projects / mirror_edk2.git / blobdiff