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authorHao Wu <hao.a.wu@intel.com>2016-08-17 14:24:04 +0800
committerHao Wu <hao.a.wu@intel.com>2016-08-22 18:54:30 +0800
commit1944b02b03e14d023e8f2cd3d614df6eca9dc8f0 (patch)
tree9e2a414e4971aa0b627f27833d40fdb1772f81a8 /MdePkg/Library/UefiMemoryLib
parentbce0133b7f0d5583c53fae0e80597568a3c8c411 (diff)
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MdePkg BaseMemoryLib: Add C implementation of API IsZeroBuffer()
Add the implementation of API IsZeroBuffer() via C language for the following library instances: BaseMemoryLib PeiMemoryLib UefiMemoryLib Cc: Michael D Kinney <michael.d.kinney@intel.com> Cc: Liming Gao <liming.gao@intel.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Hao Wu <hao.a.wu@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com>
Diffstat (limited to 'MdePkg/Library/UefiMemoryLib')
-rw-r--r--MdePkg/Library/UefiMemoryLib/IsZeroBufferWrapper.c54
-rw-r--r--MdePkg/Library/UefiMemoryLib/MemLibGeneric.c31
-rw-r--r--MdePkg/Library/UefiMemoryLib/MemLibInternals.h19
-rw-r--r--MdePkg/Library/UefiMemoryLib/UefiMemoryLib.inf3
4 files changed, 104 insertions, 3 deletions
diff --git a/MdePkg/Library/UefiMemoryLib/IsZeroBufferWrapper.c b/MdePkg/Library/UefiMemoryLib/IsZeroBufferWrapper.c
new file mode 100644
index 0000000000..c42c1aa509
--- /dev/null
+++ b/MdePkg/Library/UefiMemoryLib/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/MdePkg/Library/UefiMemoryLib/MemLibGeneric.c b/MdePkg/Library/UefiMemoryLib/MemLibGeneric.c
index 1ec8bf6bad..da02b6c52f 100644
--- a/MdePkg/Library/UefiMemoryLib/MemLibGeneric.c
+++ b/MdePkg/Library/UefiMemoryLib/MemLibGeneric.c
@@ -6,7 +6,7 @@
PeiMemoryLib
UefiMemoryLib
- Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
+ Copyright (c) 2006 - 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
@@ -258,3 +258,32 @@ 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/MdePkg/Library/UefiMemoryLib/MemLibInternals.h b/MdePkg/Library/UefiMemoryLib/MemLibInternals.h
index 0443b508bb..cafbb4dd30 100644
--- a/MdePkg/Library/UefiMemoryLib/MemLibInternals.h
+++ b/MdePkg/Library/UefiMemoryLib/MemLibInternals.h
@@ -1,7 +1,7 @@
/** @file
Declaration of internal functions for Base Memory Library.
- Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>
+ Copyright (c) 2006 - 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
@@ -229,4 +229,21 @@ 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
diff --git a/MdePkg/Library/UefiMemoryLib/UefiMemoryLib.inf b/MdePkg/Library/UefiMemoryLib/UefiMemoryLib.inf
index e82732f8b0..7382204f63 100644
--- a/MdePkg/Library/UefiMemoryLib/UefiMemoryLib.inf
+++ b/MdePkg/Library/UefiMemoryLib/UefiMemoryLib.inf
@@ -4,7 +4,7 @@
# Base Memory Library implementation that uses EFI Boot Services
# where possible for size reduction.
#
-# Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2006 - 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
@@ -42,6 +42,7 @@
SetMem16Wrapper.c
SetMemWrapper.c
CopyMemWrapper.c
+ IsZeroBufferWrapper.c
MemLibGeneric.c
MemLibGuid.c
MemLib.c