diff options
| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2016-08-31 10:07:33 +0100 |
|---|---|---|
| committer | Leif Lindholm <leif.lindholm@linaro.org> | 2016-09-02 20:10:49 +0100 |
| commit | 0b09c212a8aecf18bab2377b0c4cf43aef0f8ed3 (patch) | |
| tree | cf502134bf1a7abd9668df3d16179158644abbf8 /ArmPkg | |
| parent | a548a5421f98f0890e3ab9703a5209d3ef8a9183 (diff) | |
| download | edk2-platforms-0b09c212a8aecf18bab2377b0c4cf43aef0f8ed3.tar.xz | |
ArmPkg/BaseMemoryLibStm: implement new IsZeroBuffer() API function
BaseMemoryLib has recently been extended with an API function
IsZeroBuffer(), so copy the default implementation into BaseMemoryLibStm
as well.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
Diffstat (limited to 'ArmPkg')
4 files changed, 101 insertions, 0 deletions
diff --git a/ArmPkg/Library/BaseMemoryLibStm/BaseMemoryLibStm.inf b/ArmPkg/Library/BaseMemoryLibStm/BaseMemoryLibStm.inf index eac6cef96b..30e2459bfd 100644 --- a/ArmPkg/Library/BaseMemoryLibStm/BaseMemoryLibStm.inf +++ b/ArmPkg/Library/BaseMemoryLibStm/BaseMemoryLibStm.inf @@ -45,6 +45,7 @@ SetMem16Wrapper.c
SetMemWrapper.c
CopyMemWrapper.c
+ IsZeroBufferWrapper.c
MemLibGeneric.c
MemLibGuid.c
MemLibInternals.h
diff --git a/ArmPkg/Library/BaseMemoryLibStm/IsZeroBufferWrapper.c b/ArmPkg/Library/BaseMemoryLibStm/IsZeroBufferWrapper.c new file mode 100644 index 0000000000..c42c1aa509 --- /dev/null +++ b/ArmPkg/Library/BaseMemoryLibStm/IsZeroBufferWrapper.c @@ -0,0 +1,54 @@ +/** @file
+ Implementation of IsZeroBuffer function.
+
+ The following BaseMemoryLib instances contain the same copy of this file:
+
+ BaseMemoryLib
+ BaseMemoryLibMmx
+ BaseMemoryLibSse2
+ BaseMemoryLibRepStr
+ BaseMemoryLibOptDxe
+ BaseMemoryLibOptPei
+ PeiMemoryLib
+ UefiMemoryLib
+
+ Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
+ This program and the accompanying materials
+ are licensed and made available under the terms and conditions of the BSD License
+ which accompanies this distribution. The full text of the license may be found at
+ http://opensource.org/licenses/bsd-license.php
+
+ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include "MemLibInternals.h"
+
+/**
+ Checks if the contents of a buffer are all zeros.
+
+ This function checks whether the contents of a buffer are all zeros. If the
+ contents are all zeros, return TRUE. Otherwise, return FALSE.
+
+ If Length > 0 and Buffer is NULL, then ASSERT().
+ If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
+
+ @param Buffer The pointer to the buffer to be checked.
+ @param Length The size of the buffer (in bytes) to be checked.
+
+ @retval TRUE Contents of the buffer are all zeros.
+ @retval FALSE Contents of the buffer are not all zeros.
+
+**/
+BOOLEAN
+EFIAPI
+IsZeroBuffer (
+ IN CONST VOID *Buffer,
+ IN UINTN Length
+ )
+{
+ ASSERT (!(Buffer == NULL && Length > 0));
+ ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));
+ return InternalMemIsZeroBuffer (Buffer, Length);
+}
diff --git a/ArmPkg/Library/BaseMemoryLibStm/MemLibGeneric.c b/ArmPkg/Library/BaseMemoryLibStm/MemLibGeneric.c index 54c2701295..43fbcb6b20 100644 --- a/ArmPkg/Library/BaseMemoryLibStm/MemLibGeneric.c +++ b/ArmPkg/Library/BaseMemoryLibStm/MemLibGeneric.c @@ -262,3 +262,32 @@ InternalMemScanMem64 ( } while (--Length != 0);
return NULL;
}
+
+/**
+ Checks whether the contents of a buffer are all zeros.
+
+ @param Buffer The pointer to the buffer to be checked.
+ @param Length The size of the buffer (in bytes) to be checked.
+
+ @retval TRUE Contents of the buffer are all zeros.
+ @retval FALSE Contents of the buffer are not all zeros.
+
+**/
+BOOLEAN
+EFIAPI
+InternalMemIsZeroBuffer (
+ IN CONST VOID *Buffer,
+ IN UINTN Length
+ )
+{
+ CONST UINT8 *BufferData;
+ UINTN Index;
+
+ BufferData = Buffer;
+ for (Index = 0; Index < Length; Index++) {
+ if (BufferData[Index] != 0) {
+ return FALSE;
+ }
+ }
+ return TRUE;
+}
diff --git a/ArmPkg/Library/BaseMemoryLibStm/MemLibInternals.h b/ArmPkg/Library/BaseMemoryLibStm/MemLibInternals.h index 10c741f2c3..f7b44f5270 100644 --- a/ArmPkg/Library/BaseMemoryLibStm/MemLibInternals.h +++ b/ArmPkg/Library/BaseMemoryLibStm/MemLibInternals.h @@ -231,4 +231,21 @@ InternalMemScanMem64 ( IN UINT64 Value
);
+/**
+ Checks whether the contents of a buffer are all zeros.
+
+ @param Buffer The pointer to the buffer to be checked.
+ @param Length The size of the buffer (in bytes) to be checked.
+
+ @retval TRUE Contents of the buffer are all zeros.
+ @retval FALSE Contents of the buffer are not all zeros.
+
+**/
+BOOLEAN
+EFIAPI
+InternalMemIsZeroBuffer (
+ IN CONST VOID *Buffer,
+ IN UINTN Length
+ );
+
#endif
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