/** @file\r
Architecture Independent Base Memory Library Implementation.\r
\r
- Copyright (c) 2006, Intel Corporation<BR>\r
- All rights reserved. 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
-\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
-\r
The following BaseMemoryLib instances contain the same copy of this file:\r
-\r
BaseMemoryLib\r
PeiMemoryLib\r
- DxeMemoryLib\r
-\r
-**/\r
-\r
+ UefiMemoryLib\r
\r
+ Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>\r
+ SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
+**/\r
\r
#include "MemLibInternals.h"\r
\r
/**\r
Fills a target buffer with a 16-bit value, and returns the target buffer.\r
\r
- @param Buffer Pointer to the target buffer to fill.\r
- @param Length Number of bytes in Buffer to fill.\r
- @param Value Value with which to fill Length bytes of Buffer.\r
+ @param Buffer The pointer to the target buffer to fill.\r
+ @param Length The count of 16-bit value to fill.\r
+ @param Value The value with which to fill Length bytes of Buffer.\r
\r
@return Buffer\r
\r
VOID *\r
EFIAPI\r
InternalMemSetMem16 (\r
- OUT VOID *Buffer,\r
- IN UINTN Length,\r
- IN UINT16 Value\r
+ OUT VOID *Buffer,\r
+ IN UINTN Length,\r
+ IN UINT16 Value\r
)\r
{\r
- do {\r
- ((UINT16*)Buffer)[--Length] = Value;\r
- } while (Length != 0);\r
+ for ( ; Length != 0; Length--) {\r
+ ((UINT16 *)Buffer)[Length - 1] = Value;\r
+ }\r
+\r
return Buffer;\r
}\r
\r
/**\r
Fills a target buffer with a 32-bit value, and returns the target buffer.\r
\r
- @param Buffer Pointer to the target buffer to fill.\r
- @param Length Number of bytes in Buffer to fill.\r
- @param Value Value with which to fill Length bytes of Buffer.\r
+ @param Buffer The pointer to the target buffer to fill.\r
+ @param Length The count of 32-bit value to fill.\r
+ @param Value The value with which to fill Length bytes of Buffer.\r
\r
@return Buffer\r
\r
VOID *\r
EFIAPI\r
InternalMemSetMem32 (\r
- OUT VOID *Buffer,\r
- IN UINTN Length,\r
- IN UINT32 Value\r
+ OUT VOID *Buffer,\r
+ IN UINTN Length,\r
+ IN UINT32 Value\r
)\r
{\r
- do {\r
- ((UINT32*)Buffer)[--Length] = Value;\r
- } while (Length != 0);\r
+ for ( ; Length != 0; Length--) {\r
+ ((UINT32 *)Buffer)[Length - 1] = Value;\r
+ }\r
+\r
return Buffer;\r
}\r
\r
/**\r
Fills a target buffer with a 64-bit value, and returns the target buffer.\r
\r
- @param Buffer Pointer to the target buffer to fill.\r
- @param Length Number of bytes in Buffer to fill.\r
- @param Value Value with which to fill Length bytes of Buffer.\r
+ @param Buffer The pointer to the target buffer to fill.\r
+ @param Length The count of 64-bit value to fill.\r
+ @param Value The value with which to fill Length bytes of Buffer.\r
\r
@return Buffer\r
\r
VOID *\r
EFIAPI\r
InternalMemSetMem64 (\r
- OUT VOID *Buffer,\r
- IN UINTN Length,\r
- IN UINT64 Value\r
+ OUT VOID *Buffer,\r
+ IN UINTN Length,\r
+ IN UINT64 Value\r
)\r
{\r
- do {\r
- ((UINT64*)Buffer)[--Length] = Value;\r
- } while (Length != 0);\r
+ for ( ; Length != 0; Length--) {\r
+ ((UINT64 *)Buffer)[Length - 1] = Value;\r
+ }\r
+\r
return Buffer;\r
}\r
\r
Set Buffer to 0 for Size bytes.\r
\r
@param Buffer Memory to set.\r
- @param Length Number of bytes to set\r
+ @param Length The number of bytes to set.\r
\r
@return Buffer\r
\r
VOID *\r
EFIAPI\r
InternalMemZeroMem (\r
- OUT VOID *Buffer,\r
- IN UINTN Length\r
+ OUT VOID *Buffer,\r
+ IN UINTN Length\r
)\r
{\r
return InternalMemSetMem (Buffer, Length, 0);\r
/**\r
Compares two memory buffers of a given length.\r
\r
- @param DestinationBuffer First memory buffer\r
- @param SourceBuffer Second memory buffer\r
+ @param DestinationBuffer The first memory buffer.\r
+ @param SourceBuffer The second memory buffer.\r
@param Length Length of DestinationBuffer and SourceBuffer memory\r
regions to compare. Must be non-zero.\r
\r
- @retval 0 if MemOne == MemTwo\r
+ @return 0 All Length bytes of the two buffers are identical.\r
+ @retval Non-zero The first mismatched byte in SourceBuffer subtracted from the first\r
+ mismatched byte in DestinationBuffer.\r
\r
**/\r
INTN\r
EFIAPI\r
InternalMemCompareMem (\r
- IN CONST VOID *DestinationBuffer,\r
- IN CONST VOID *SourceBuffer,\r
- IN UINTN Length\r
+ IN CONST VOID *DestinationBuffer,\r
+ IN CONST VOID *SourceBuffer,\r
+ IN UINTN Length\r
)\r
{\r
while ((--Length != 0) &&\r
- (*(INT8*)DestinationBuffer == *(INT8*)SourceBuffer)) {\r
- DestinationBuffer = (INT8*)DestinationBuffer + 1;\r
- SourceBuffer = (INT8*)SourceBuffer + 1;\r
+ (*(INT8 *)DestinationBuffer == *(INT8 *)SourceBuffer))\r
+ {\r
+ DestinationBuffer = (INT8 *)DestinationBuffer + 1;\r
+ SourceBuffer = (INT8 *)SourceBuffer + 1;\r
}\r
- return (INTN)*(UINT8*)DestinationBuffer - (INTN)*(UINT8*)SourceBuffer;\r
+\r
+ return (INTN)*(UINT8 *)DestinationBuffer - (INTN)*(UINT8 *)SourceBuffer;\r
}\r
\r
/**\r
Scans a target buffer for an 8-bit value, and returns a pointer to the\r
matching 8-bit value in the target buffer.\r
\r
- @param Buffer Pointer to the target buffer to scan.\r
- @param Length Number of bytes in Buffer to scan. Must be non-zero.\r
- @param Value Value to search for in the target buffer.\r
+ @param Buffer The pointer to the target buffer to scan.\r
+ @param Length The count of 8-bit value to scan. Must be non-zero.\r
+ @param Value The value to search for in the target buffer.\r
\r
- @return Pointer to the first occurrence or NULL if not found.\r
+ @return The pointer to the first occurrence, or NULL if not found.\r
\r
**/\r
CONST VOID *\r
EFIAPI\r
InternalMemScanMem8 (\r
- IN CONST VOID *Buffer,\r
- IN UINTN Length,\r
- IN UINT8 Value\r
+ IN CONST VOID *Buffer,\r
+ IN UINTN Length,\r
+ IN UINT8 Value\r
)\r
{\r
- CONST UINT8 *Pointer;\r
+ CONST UINT8 *Pointer;\r
\r
- Pointer = (CONST UINT8*)Buffer;\r
+ Pointer = (CONST UINT8 *)Buffer;\r
do {\r
- if (*(Pointer++) == Value) {\r
+ if (*Pointer == Value) {\r
return Pointer;\r
}\r
+\r
+ ++Pointer;\r
} while (--Length != 0);\r
+\r
return NULL;\r
}\r
\r
Scans a target buffer for a 16-bit value, and returns a pointer to the\r
matching 16-bit value in the target buffer.\r
\r
- @param Buffer Pointer to the target buffer to scan.\r
- @param Length Number of bytes in Buffer to scan. Must be non-zero.\r
- @param Value Value to search for in the target buffer.\r
+ @param Buffer The pointer to the target buffer to scan.\r
+ @param Length The count of 16-bit value to scan. Must be non-zero.\r
+ @param Value The value to search for in the target buffer.\r
\r
- @return Pointer to the first occurrence or NULL if not found.\r
+ @return The pointer to the first occurrence, or NULL if not found.\r
\r
**/\r
CONST VOID *\r
EFIAPI\r
InternalMemScanMem16 (\r
- IN CONST VOID *Buffer,\r
- IN UINTN Length,\r
- IN UINT16 Value\r
+ IN CONST VOID *Buffer,\r
+ IN UINTN Length,\r
+ IN UINT16 Value\r
)\r
{\r
- CONST UINT16 *Pointer;\r
+ CONST UINT16 *Pointer;\r
\r
- Pointer = (CONST UINT16*)Buffer;\r
+ Pointer = (CONST UINT16 *)Buffer;\r
do {\r
- if (*(Pointer++) == Value) {\r
+ if (*Pointer == Value) {\r
return Pointer;\r
}\r
+\r
+ ++Pointer;\r
} while (--Length != 0);\r
+\r
return NULL;\r
}\r
\r
Scans a target buffer for a 32-bit value, and returns a pointer to the\r
matching 32-bit value in the target buffer.\r
\r
- @param Buffer Pointer to the target buffer to scan.\r
- @param Length Number of bytes in Buffer to scan. Must be non-zero.\r
- @param Value Value to search for in the target buffer.\r
+ @param Buffer The pointer to the target buffer to scan.\r
+ @param Length The count of 32-bit value to scan. Must be non-zero.\r
+ @param Value The value to search for in the target buffer.\r
\r
- @return Pointer to the first occurrence or NULL if not found.\r
+ @return The pointer to the first occurrence, or NULL if not found.\r
\r
**/\r
CONST VOID *\r
EFIAPI\r
InternalMemScanMem32 (\r
- IN CONST VOID *Buffer,\r
- IN UINTN Length,\r
- IN UINT32 Value\r
+ IN CONST VOID *Buffer,\r
+ IN UINTN Length,\r
+ IN UINT32 Value\r
)\r
{\r
- CONST UINT32 *Pointer;\r
+ CONST UINT32 *Pointer;\r
\r
- Pointer = (CONST UINT32*)Buffer;\r
+ Pointer = (CONST UINT32 *)Buffer;\r
do {\r
- if (*(Pointer++) == Value) {\r
+ if (*Pointer == Value) {\r
return Pointer;\r
}\r
+\r
+ ++Pointer;\r
} while (--Length != 0);\r
+\r
return NULL;\r
}\r
\r
Scans a target buffer for a 64-bit value, and returns a pointer to the\r
matching 64-bit value in the target buffer.\r
\r
- @param Buffer Pointer to the target buffer to scan.\r
- @param Length Number of bytes in Buffer to scan. Must be non-zero.\r
- @param Value Value to search for in the target buffer.\r
+ @param Buffer The pointer to the target buffer to scan.\r
+ @param Length The count of 64-bit value to scan. Must be non-zero.\r
+ @param Value The value to search for in the target buffer.\r
\r
- @return Pointer to the first occurrence or NULL if not found.\r
+ @return The pointer to the first occurrence, or NULL if not found.\r
\r
**/\r
CONST VOID *\r
EFIAPI\r
InternalMemScanMem64 (\r
- IN CONST VOID *Buffer,\r
- IN UINTN Length,\r
- IN UINT64 Value\r
+ IN CONST VOID *Buffer,\r
+ IN UINTN Length,\r
+ IN UINT64 Value\r
)\r
{\r
- CONST UINT64 *Pointer;\r
+ CONST UINT64 *Pointer;\r
\r
- Pointer = (CONST UINT64*)Buffer;\r
+ Pointer = (CONST UINT64 *)Buffer;\r
do {\r
- if (*(Pointer++) == Value) {\r
+ if (*Pointer == Value) {\r
return Pointer;\r
}\r
+\r
+ ++Pointer;\r
} while (--Length != 0);\r
+\r
return NULL;\r
}\r
+\r
+/**\r
+ Checks whether the contents of a buffer are all zeros.\r
+\r
+ @param Buffer The pointer to the buffer to be checked.\r
+ @param Length The size of the buffer (in bytes) to be checked.\r
+\r
+ @retval TRUE Contents of the buffer are all zeros.\r
+ @retval FALSE Contents of the buffer are not all zeros.\r
+\r
+**/\r
+BOOLEAN\r
+EFIAPI\r
+InternalMemIsZeroBuffer (\r
+ IN CONST VOID *Buffer,\r
+ IN UINTN Length\r
+ )\r
+{\r
+ CONST UINT8 *BufferData;\r
+ UINTN Index;\r
+\r
+ BufferData = Buffer;\r
+ for (Index = 0; Index < Length; Index++) {\r
+ if (BufferData[Index] != 0) {\r
+ return FALSE;\r
+ }\r
+ }\r
+\r
+ return TRUE;\r
+}\r
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