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| author | vanjeff <vanjeff@6f19259b-4bc3-4df7-8a09-765794883524> | 2007-06-22 03:21:45 +0000 |
|---|---|---|
| committer | vanjeff <vanjeff@6f19259b-4bc3-4df7-8a09-765794883524> | 2007-06-22 03:21:45 +0000 |
| commit | e1f414b6a7d8a0424e0e01f655b09a4612b4d0e8 (patch) | |
| tree | 32d74f9463f0b5c6a28ff6aff73709219d437604 /MdePkg/Library/BaseLib/Unaligned.c | |
| parent | e053747a04ad7b8d71c7593b93e1575ba0057a91 (diff) | |
| download | edk2-platforms-e1f414b6a7d8a0424e0e01f655b09a4612b4d0e8.tar.xz | |
Import some basic libraries instances for Mde Packages.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2704 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'MdePkg/Library/BaseLib/Unaligned.c')
| -rw-r--r-- | MdePkg/Library/BaseLib/Unaligned.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/Unaligned.c b/MdePkg/Library/BaseLib/Unaligned.c new file mode 100644 index 0000000000..fef8343e94 --- /dev/null +++ b/MdePkg/Library/BaseLib/Unaligned.c @@ -0,0 +1,225 @@ +/** @file
+ Unaligned access functions of BaseLib.
+
+ Copyright (c) 2006, Intel Corporation
+ All rights reserved. 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.
+
+ Module Name: Unaligned.c
+
+**/
+
+//
+// Include common header file for this module.
+//
+#include "CommonHeader.h"
+
+/**
+ Reads a 16-bit value from memory that may be unaligned.
+
+ This function returns the 16-bit value pointed to by Buffer. The function
+ guarantees that the read operation does not produce an alignment fault.
+
+ If the Buffer is NULL, then ASSERT().
+
+ @param Buffer Pointer to a 16-bit value that may be unaligned.
+
+ @return *Uint16
+
+**/
+UINT16
+EFIAPI
+ReadUnaligned16 (
+ IN CONST UINT16 *Buffer
+ )
+{
+ ASSERT (Buffer != NULL);
+
+ return *Buffer;
+}
+
+/**
+ Writes a 16-bit value to memory that may be unaligned.
+
+ This function writes the 16-bit value specified by Value to Buffer. Value is
+ returned. The function guarantees that the write operation does not produce
+ an alignment fault.
+
+ If the Buffer is NULL, then ASSERT().
+
+ @param Buffer Pointer to a 16-bit value that may be unaligned.
+ @param Value 16-bit value to write to Buffer.
+
+ @return Value
+
+**/
+UINT16
+EFIAPI
+WriteUnaligned16 (
+ OUT UINT16 *Buffer,
+ IN UINT16 Value
+ )
+{
+ ASSERT (Buffer != NULL);
+
+ return *Buffer = Value;
+}
+
+/**
+ Reads a 24-bit value from memory that may be unaligned.
+
+ This function returns the 24-bit value pointed to by Buffer. The function
+ guarantees that the read operation does not produce an alignment fault.
+
+ If the Buffer is NULL, then ASSERT().
+
+ @param Buffer Pointer to a 24-bit value that may be unaligned.
+
+ @return The value read.
+
+**/
+UINT32
+EFIAPI
+ReadUnaligned24 (
+ IN CONST UINT32 *Buffer
+ )
+{
+ ASSERT (Buffer != NULL);
+
+ return *Buffer & 0xffffff;
+}
+
+/**
+ Writes a 24-bit value to memory that may be unaligned.
+
+ This function writes the 24-bit value specified by Value to Buffer. Value is
+ returned. The function guarantees that the write operation does not produce
+ an alignment fault.
+
+ If the Buffer is NULL, then ASSERT().
+
+ @param Buffer Pointer to a 24-bit value that may be unaligned.
+ @param Value 24-bit value to write to Buffer.
+
+ @return The value written.
+
+**/
+UINT32
+EFIAPI
+WriteUnaligned24 (
+ OUT UINT32 *Buffer,
+ IN UINT32 Value
+ )
+{
+ ASSERT (Buffer != NULL);
+
+ *Buffer = BitFieldWrite32 (*Buffer, 0, 23, Value);
+ return Value;
+}
+
+/**
+ Reads a 32-bit value from memory that may be unaligned.
+
+ This function returns the 32-bit value pointed to by Buffer. The function
+ guarantees that the read operation does not produce an alignment fault.
+
+ If the Buffer is NULL, then ASSERT().
+
+ @param Buffer Pointer to a 32-bit value that may be unaligned.
+
+ @return *Uint32
+
+**/
+UINT32
+EFIAPI
+ReadUnaligned32 (
+ IN CONST UINT32 *Buffer
+ )
+{
+ ASSERT (Buffer != NULL);
+
+ return *Buffer;
+}
+
+/**
+ Writes a 32-bit value to memory that may be unaligned.
+
+ This function writes the 32-bit value specified by Value to Buffer. Value is
+ returned. The function guarantees that the write operation does not produce
+ an alignment fault.
+
+ If the Buffer is NULL, then ASSERT().
+
+ @param Buffer Pointer to a 32-bit value that may be unaligned.
+ @param Value 32-bit value to write to Buffer.
+
+ @return Value
+
+**/
+UINT32
+EFIAPI
+WriteUnaligned32 (
+ OUT UINT32 *Buffer,
+ IN UINT32 Value
+ )
+{
+ ASSERT (Buffer != NULL);
+
+ return *Buffer = Value;
+}
+
+/**
+ Reads a 64-bit value from memory that may be unaligned.
+
+ This function returns the 64-bit value pointed to by Buffer. The function
+ guarantees that the read operation does not produce an alignment fault.
+
+ If the Buffer is NULL, then ASSERT().
+
+ @param Buffer Pointer to a 64-bit value that may be unaligned.
+
+ @return *Uint64
+
+**/
+UINT64
+EFIAPI
+ReadUnaligned64 (
+ IN CONST UINT64 *Buffer
+ )
+{
+ ASSERT (Buffer != NULL);
+
+ return *Buffer;
+}
+
+/**
+ Writes a 64-bit value to memory that may be unaligned.
+
+ This function writes the 64-bit value specified by Value to Buffer. Value is
+ returned. The function guarantees that the write operation does not produce
+ an alignment fault.
+
+ If the Buffer is NULL, then ASSERT().
+
+ @param Buffer Pointer to a 64-bit value that may be unaligned.
+ @param Value 64-bit value to write to Buffer.
+
+ @return Value
+
+**/
+UINT64
+EFIAPI
+WriteUnaligned64 (
+ OUT UINT64 *Buffer,
+ IN UINT64 Value
+ )
+{
+ ASSERT (Buffer != NULL);
+
+ return *Buffer = Value;
+}
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