[PATCH 2/3] MdePkg BaseMemoryLib: Add implementation of API IsZeroBuffer()


Wu, Hao A
 

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>
---
MdePkg/Include/Library/BaseMemoryLib.h | 23 ++++++++
MdePkg/Library/BaseMemoryLib/BaseMemoryLib.inf | 1 +
MdePkg/Library/BaseMemoryLib/IsZeroBuffer.c | 65 ++++++++++++++++++++++
.../Library/BaseMemoryLibMmx/BaseMemoryLibMmx.inf | 1 +
MdePkg/Library/BaseMemoryLibMmx/IsZeroBuffer.c | 65 ++++++++++++++++++++++
.../BaseMemoryLibOptDxe/BaseMemoryLibOptDxe.inf | 2 +
MdePkg/Library/BaseMemoryLibOptDxe/IsZeroBuffer.c | 65 ++++++++++++++++++++++
.../BaseMemoryLibOptPei/BaseMemoryLibOptPei.inf | 2 +
MdePkg/Library/BaseMemoryLibOptPei/IsZeroBuffer.c | 65 ++++++++++++++++++++++
.../BaseMemoryLibRepStr/BaseMemoryLibRepStr.inf | 1 +
MdePkg/Library/BaseMemoryLibRepStr/IsZeroBuffer.c | 65 ++++++++++++++++++++++
.../BaseMemoryLibSse2/BaseMemoryLibSse2.inf | 1 +
MdePkg/Library/BaseMemoryLibSse2/IsZeroBuffer.c | 65 ++++++++++++++++++++++
MdePkg/Library/PeiMemoryLib/IsZeroBuffer.c | 65 ++++++++++++++++++++++
MdePkg/Library/PeiMemoryLib/PeiMemoryLib.inf | 1 +
MdePkg/Library/UefiMemoryLib/IsZeroBuffer.c | 65 ++++++++++++++++++++++
MdePkg/Library/UefiMemoryLib/UefiMemoryLib.inf | 1 +
17 files changed, 553 insertions(+)
create mode 100644 MdePkg/Library/BaseMemoryLib/IsZeroBuffer.c
create mode 100644 MdePkg/Library/BaseMemoryLibMmx/IsZeroBuffer.c
create mode 100644 MdePkg/Library/BaseMemoryLibOptDxe/IsZeroBuffer.c
create mode 100644 MdePkg/Library/BaseMemoryLibOptPei/IsZeroBuffer.c
create mode 100644 MdePkg/Library/BaseMemoryLibRepStr/IsZeroBuffer.c
create mode 100644 MdePkg/Library/BaseMemoryLibSse2/IsZeroBuffer.c
create mode 100644 MdePkg/Library/PeiMemoryLib/IsZeroBuffer.c
create mode 100644 MdePkg/Library/UefiMemoryLib/IsZeroBuffer.c

diff --git a/MdePkg/Include/Library/BaseMemoryLib.h b/MdePkg/Include/Library/BaseMemoryLib.h
index 5a57dee..1338c27 100644
--- a/MdePkg/Include/Library/BaseMemoryLib.h
+++ b/MdePkg/Include/Library/BaseMemoryLib.h
@@ -463,4 +463,27 @@ IsZeroGuid (
IN CONST GUID *Guid
);

+/**
+ 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
+ );
+
#endif
diff --git a/MdePkg/Library/BaseMemoryLib/BaseMemoryLib.inf b/MdePkg/Library/BaseMemoryLib/BaseMemoryLib.inf
index 5dfab35..51b4d16 100644
--- a/MdePkg/Library/BaseMemoryLib/BaseMemoryLib.inf
+++ b/MdePkg/Library/BaseMemoryLib/BaseMemoryLib.inf
@@ -45,6 +45,7 @@
MemLibGeneric.c
MemLibGuid.c
CopyMem.c
+ IsZeroBuffer.c
MemLibInternals.h

[Packages]
diff --git a/MdePkg/Library/BaseMemoryLib/IsZeroBuffer.c b/MdePkg/Library/BaseMemoryLib/IsZeroBuffer.c
new file mode 100644
index 0000000..fda0c7c
--- /dev/null
+++ b/MdePkg/Library/BaseMemoryLib/IsZeroBuffer.c
@@ -0,0 +1,65 @@
+/** @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 <Base.h>
+#include <Library/DebugLib.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
+ )
+{
+ CONST UINT8 *BufferData;
+ UINTN Index;
+
+ ASSERT (!(Buffer == NULL && Length > 0));
+ ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));
+
+ BufferData = Buffer;
+ for (Index = 0; Index < Length; Index++) {
+ if (BufferData[Index] != 0) {
+ return FALSE;
+ }
+ }
+ return TRUE;
+}
diff --git a/MdePkg/Library/BaseMemoryLibMmx/BaseMemoryLibMmx.inf b/MdePkg/Library/BaseMemoryLibMmx/BaseMemoryLibMmx.inf
index a609073..59261f9 100644
--- a/MdePkg/Library/BaseMemoryLibMmx/BaseMemoryLibMmx.inf
+++ b/MdePkg/Library/BaseMemoryLibMmx/BaseMemoryLibMmx.inf
@@ -47,6 +47,7 @@
SetMemWrapper.c
CopyMemWrapper.c
MemLibGuid.c
+ IsZeroBuffer.c
MemLibInternals.h

[Sources.Ia32]
diff --git a/MdePkg/Library/BaseMemoryLibMmx/IsZeroBuffer.c b/MdePkg/Library/BaseMemoryLibMmx/IsZeroBuffer.c
new file mode 100644
index 0000000..fda0c7c
--- /dev/null
+++ b/MdePkg/Library/BaseMemoryLibMmx/IsZeroBuffer.c
@@ -0,0 +1,65 @@
+/** @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 <Base.h>
+#include <Library/DebugLib.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
+ )
+{
+ CONST UINT8 *BufferData;
+ UINTN Index;
+
+ ASSERT (!(Buffer == NULL && Length > 0));
+ ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));
+
+ BufferData = Buffer;
+ for (Index = 0; Index < Length; Index++) {
+ if (BufferData[Index] != 0) {
+ return FALSE;
+ }
+ }
+ return TRUE;
+}
diff --git a/MdePkg/Library/BaseMemoryLibOptDxe/BaseMemoryLibOptDxe.inf b/MdePkg/Library/BaseMemoryLibOptDxe/BaseMemoryLibOptDxe.inf
index e637034..a75270b 100644
--- a/MdePkg/Library/BaseMemoryLibOptDxe/BaseMemoryLibOptDxe.inf
+++ b/MdePkg/Library/BaseMemoryLibOptDxe/BaseMemoryLibOptDxe.inf
@@ -90,6 +90,7 @@
SetMemWrapper.c
CopyMemWrapper.c
MemLibGuid.c
+ IsZeroBuffer.c

[Sources.X64]
X64/ScanMem64.nasm
@@ -137,6 +138,7 @@
SetMemWrapper.c
CopyMemWrapper.c
MemLibGuid.c
+ IsZeroBuffer.c

[Packages]
MdePkg/MdePkg.dec
diff --git a/MdePkg/Library/BaseMemoryLibOptDxe/IsZeroBuffer.c b/MdePkg/Library/BaseMemoryLibOptDxe/IsZeroBuffer.c
new file mode 100644
index 0000000..fda0c7c
--- /dev/null
+++ b/MdePkg/Library/BaseMemoryLibOptDxe/IsZeroBuffer.c
@@ -0,0 +1,65 @@
+/** @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 <Base.h>
+#include <Library/DebugLib.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
+ )
+{
+ CONST UINT8 *BufferData;
+ UINTN Index;
+
+ ASSERT (!(Buffer == NULL && Length > 0));
+ ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));
+
+ BufferData = Buffer;
+ for (Index = 0; Index < Length; Index++) {
+ if (BufferData[Index] != 0) {
+ return FALSE;
+ }
+ }
+ return TRUE;
+}
diff --git a/MdePkg/Library/BaseMemoryLibOptPei/BaseMemoryLibOptPei.inf b/MdePkg/Library/BaseMemoryLibOptPei/BaseMemoryLibOptPei.inf
index ff60e9e..bd915eb 100644
--- a/MdePkg/Library/BaseMemoryLibOptPei/BaseMemoryLibOptPei.inf
+++ b/MdePkg/Library/BaseMemoryLibOptPei/BaseMemoryLibOptPei.inf
@@ -90,6 +90,7 @@
SetMemWrapper.c
CopyMemWrapper.c
MemLibGuid.c
+ IsZeroBuffer.c

[Sources.X64]
X64/ScanMem64.nasm
@@ -137,6 +138,7 @@
SetMemWrapper.c
CopyMemWrapper.c
MemLibGuid.c
+ IsZeroBuffer.c


[Packages]
diff --git a/MdePkg/Library/BaseMemoryLibOptPei/IsZeroBuffer.c b/MdePkg/Library/BaseMemoryLibOptPei/IsZeroBuffer.c
new file mode 100644
index 0000000..fda0c7c
--- /dev/null
+++ b/MdePkg/Library/BaseMemoryLibOptPei/IsZeroBuffer.c
@@ -0,0 +1,65 @@
+/** @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 <Base.h>
+#include <Library/DebugLib.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
+ )
+{
+ CONST UINT8 *BufferData;
+ UINTN Index;
+
+ ASSERT (!(Buffer == NULL && Length > 0));
+ ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));
+
+ BufferData = Buffer;
+ for (Index = 0; Index < Length; Index++) {
+ if (BufferData[Index] != 0) {
+ return FALSE;
+ }
+ }
+ return TRUE;
+}
diff --git a/MdePkg/Library/BaseMemoryLibRepStr/BaseMemoryLibRepStr.inf b/MdePkg/Library/BaseMemoryLibRepStr/BaseMemoryLibRepStr.inf
index 9d7ce4b..aac7865 100644
--- a/MdePkg/Library/BaseMemoryLibRepStr/BaseMemoryLibRepStr.inf
+++ b/MdePkg/Library/BaseMemoryLibRepStr/BaseMemoryLibRepStr.inf
@@ -44,6 +44,7 @@
SetMemWrapper.c
CopyMemWrapper.c
MemLibGuid.c
+ IsZeroBuffer.c

[Sources.Ia32]
Ia32/ScanMem64.nasm
diff --git a/MdePkg/Library/BaseMemoryLibRepStr/IsZeroBuffer.c b/MdePkg/Library/BaseMemoryLibRepStr/IsZeroBuffer.c
new file mode 100644
index 0000000..fda0c7c
--- /dev/null
+++ b/MdePkg/Library/BaseMemoryLibRepStr/IsZeroBuffer.c
@@ -0,0 +1,65 @@
+/** @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 <Base.h>
+#include <Library/DebugLib.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
+ )
+{
+ CONST UINT8 *BufferData;
+ UINTN Index;
+
+ ASSERT (!(Buffer == NULL && Length > 0));
+ ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));
+
+ BufferData = Buffer;
+ for (Index = 0; Index < Length; Index++) {
+ if (BufferData[Index] != 0) {
+ return FALSE;
+ }
+ }
+ return TRUE;
+}
diff --git a/MdePkg/Library/BaseMemoryLibSse2/BaseMemoryLibSse2.inf b/MdePkg/Library/BaseMemoryLibSse2/BaseMemoryLibSse2.inf
index a78d823..2919827 100644
--- a/MdePkg/Library/BaseMemoryLibSse2/BaseMemoryLibSse2.inf
+++ b/MdePkg/Library/BaseMemoryLibSse2/BaseMemoryLibSse2.inf
@@ -43,6 +43,7 @@
SetMemWrapper.c
CopyMemWrapper.c
MemLibGuid.c
+ IsZeroBuffer.c

[Sources.Ia32]
Ia32/ScanMem64.nasm
diff --git a/MdePkg/Library/BaseMemoryLibSse2/IsZeroBuffer.c b/MdePkg/Library/BaseMemoryLibSse2/IsZeroBuffer.c
new file mode 100644
index 0000000..6a3a2c1
--- /dev/null
+++ b/MdePkg/Library/BaseMemoryLibSse2/IsZeroBuffer.c
@@ -0,0 +1,65 @@
+/** @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 <Base.h>
+#include <Library/DebugLib.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
+ )
+{
+ CONST UINT8 *BufferData;
+ UINTN Index;
+
+ ASSERT (!(Buffer == NULL && Length > 0));
+ ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));
+
+ BufferData = Buffer;
+ for (Index = 0; Index < Length; Index++) {
+ if (BufferData[Index] != 0) {
+ return FALSE;
+ }
+ }
+ return TRUE;
+}
diff --git a/MdePkg/Library/PeiMemoryLib/IsZeroBuffer.c b/MdePkg/Library/PeiMemoryLib/IsZeroBuffer.c
new file mode 100644
index 0000000..fda0c7c
--- /dev/null
+++ b/MdePkg/Library/PeiMemoryLib/IsZeroBuffer.c
@@ -0,0 +1,65 @@
+/** @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 <Base.h>
+#include <Library/DebugLib.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
+ )
+{
+ CONST UINT8 *BufferData;
+ UINTN Index;
+
+ ASSERT (!(Buffer == NULL && Length > 0));
+ ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));
+
+ BufferData = Buffer;
+ for (Index = 0; Index < Length; Index++) {
+ if (BufferData[Index] != 0) {
+ return FALSE;
+ }
+ }
+ return TRUE;
+}
diff --git a/MdePkg/Library/PeiMemoryLib/PeiMemoryLib.inf b/MdePkg/Library/PeiMemoryLib/PeiMemoryLib.inf
index 58af9d0..9760639 100644
--- a/MdePkg/Library/PeiMemoryLib/PeiMemoryLib.inf
+++ b/MdePkg/Library/PeiMemoryLib/PeiMemoryLib.inf
@@ -45,6 +45,7 @@
MemLibGeneric.c
MemLibGuid.c
MemLib.c
+ IsZeroBuffer.c
MemLibInternals.h


diff --git a/MdePkg/Library/UefiMemoryLib/IsZeroBuffer.c b/MdePkg/Library/UefiMemoryLib/IsZeroBuffer.c
new file mode 100644
index 0000000..fda0c7c
--- /dev/null
+++ b/MdePkg/Library/UefiMemoryLib/IsZeroBuffer.c
@@ -0,0 +1,65 @@
+/** @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 <Base.h>
+#include <Library/DebugLib.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
+ )
+{
+ CONST UINT8 *BufferData;
+ UINTN Index;
+
+ ASSERT (!(Buffer == NULL && Length > 0));
+ ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));
+
+ BufferData = Buffer;
+ for (Index = 0; Index < Length; Index++) {
+ if (BufferData[Index] != 0) {
+ return FALSE;
+ }
+ }
+ return TRUE;
+}
diff --git a/MdePkg/Library/UefiMemoryLib/UefiMemoryLib.inf b/MdePkg/Library/UefiMemoryLib/UefiMemoryLib.inf
index e82732f..2ea7875 100644
--- a/MdePkg/Library/UefiMemoryLib/UefiMemoryLib.inf
+++ b/MdePkg/Library/UefiMemoryLib/UefiMemoryLib.inf
@@ -45,6 +45,7 @@
MemLibGeneric.c
MemLibGuid.c
MemLib.c
+ IsZeroBuffer.c
MemLibInternals.h


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1.9.5.msysgit.0