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>

diff --git a/ArmPkg/Library/BaseMemoryLibStm/BaseMemoryLibStm.inf b/ArmPkg/Library/BaseMemoryLibStm/BaseMemoryLibStm.inf
index eac6cef96b3132f071872cd8dee9132c51ff5b36..30e2459bfd1e2d70b05aa19dca46d798025217a0 100644 (file)
--- a/ArmPkg/Library/BaseMemoryLibStm/BaseMemoryLibStm.inf
+++ b/ArmPkg/Library/BaseMemoryLibStm/BaseMemoryLibStm.inf
@@ -45,6 +45,7 @@
   SetMem16Wrapper.c\r
   SetMemWrapper.c\r
   CopyMemWrapper.c\r
+  IsZeroBufferWrapper.c\r
   MemLibGeneric.c\r
   MemLibGuid.c\r
   MemLibInternals.h\r

diff --git a/ArmPkg/Library/BaseMemoryLibStm/IsZeroBufferWrapper.c b/ArmPkg/Library/BaseMemoryLibStm/IsZeroBufferWrapper.c
new file mode 100644 (file)
index 0000000..c42c1aa
--- /dev/null
+++ b/ArmPkg/Library/BaseMemoryLibStm/IsZeroBufferWrapper.c
@@ -0,0 +1,54 @@
+/** @file\r
+  Implementation of IsZeroBuffer function.\r
+\r
+  The following BaseMemoryLib instances contain the same copy of this file:\r
+\r
+    BaseMemoryLib\r
+    BaseMemoryLibMmx\r
+    BaseMemoryLibSse2\r
+    BaseMemoryLibRepStr\r
+    BaseMemoryLibOptDxe\r
+    BaseMemoryLibOptPei\r
+    PeiMemoryLib\r
+    UefiMemoryLib\r
+\r
+  Copyright (c) 2016, 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
+\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
+**/\r
+\r
+#include "MemLibInternals.h"\r
+\r
+/**\r
+  Checks if the contents of a buffer are all zeros.\r
+\r
+  This function checks whether the contents of a buffer are all zeros. If the\r
+  contents are all zeros, return TRUE. Otherwise, return FALSE.\r
+\r
+  If Length > 0 and Buffer is NULL, then ASSERT().\r
+  If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().\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
+IsZeroBuffer (\r
+  IN CONST VOID  *Buffer,\r
+  IN UINTN       Length\r
+  )\r
+{\r
+  ASSERT (!(Buffer == NULL && Length > 0));\r
+  ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));\r
+  return InternalMemIsZeroBuffer (Buffer, Length);\r
+}\r

diff --git a/ArmPkg/Library/BaseMemoryLibStm/MemLibGeneric.c b/ArmPkg/Library/BaseMemoryLibStm/MemLibGeneric.c
index 54c27012955f520beb0db1e99d43e2086862807d..43fbcb6b208f0d155e3492c731649becd96fa9ca 100644 (file)
--- a/ArmPkg/Library/BaseMemoryLibStm/MemLibGeneric.c
+++ b/ArmPkg/Library/BaseMemoryLibStm/MemLibGeneric.c
@@ -262,3 +262,32 @@ InternalMemScanMem64 (
   } while (--Length != 0);\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
+  return TRUE;\r
+}\r

diff --git a/ArmPkg/Library/BaseMemoryLibStm/MemLibInternals.h b/ArmPkg/Library/BaseMemoryLibStm/MemLibInternals.h
index 10c741f2c31138b6f810b0b25228487eb5e11423..f7b44f5270590f8077f79d7e7cacadd7a06a2f04 100644 (file)
--- a/ArmPkg/Library/BaseMemoryLibStm/MemLibInternals.h
+++ b/ArmPkg/Library/BaseMemoryLibStm/MemLibInternals.h
@@ -231,4 +231,21 @@ InternalMemScanMem64 (
   IN      UINT64                    Value\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
 #endif\r