diff options
| author |   Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
|---|---|---|
| committer | Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
| commit | af1a266670d040d2f4083ff309d732d648afba2a (patch) | |
| tree | 2fc46203448ddcc6f81546d379abfaeb323575e9 /roms/edk2/MdePkg/Library/BaseLib/Unaligned.c | |
| parent | e02cda008591317b1625707ff8e115a4841aa889 (diff) | |
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/edk2/MdePkg/Library/BaseLib/Unaligned.c')
| -rw-r--r-- | roms/edk2/MdePkg/Library/BaseLib/Unaligned.c | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/roms/edk2/MdePkg/Library/BaseLib/Unaligned.c b/roms/edk2/MdePkg/Library/BaseLib/Unaligned.c new file mode 100644 index 000000000..a419cb85e --- /dev/null +++ b/roms/edk2/MdePkg/Library/BaseLib/Unaligned.c @@ -0,0 +1,216 @@ +/** @file
+ Unaligned access functions of BaseLib.
+
+ Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+
+#include "BaseLibInternals.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 A pointer to a 16-bit value that may be unaligned.
+
+ @return The 16-bit value read from Buffer.
+
+**/
+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 A pointer to a 16-bit value that may be unaligned.
+ @param Value 16-bit value to write to Buffer.
+
+ @return The 16-bit value to write to Buffer.
+
+**/
+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 A pointer to a 24-bit value that may be unaligned.
+
+ @return The 24-bit value read from Buffer.
+
+**/
+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 A pointer to a 24-bit value that may be unaligned.
+ @param Value 24-bit value to write to Buffer.
+
+ @return The 24-bit value to write to Buffer.
+
+**/
+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 A pointer to a 32-bit value that may be unaligned.
+
+ @return The 32-bit value read from Buffer.
+
+**/
+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 A pointer to a 32-bit value that may be unaligned.
+ @param Value The 32-bit value to write to Buffer.
+
+ @return The 32-bit value to write to Buffer.
+
+**/
+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 A pointer to a 64-bit value that may be unaligned.
+
+ @return The 64-bit value read from Buffer.
+
+**/
+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 A pointer to a 64-bit value that may be unaligned.
+ @param Value The 64-bit value to write to Buffer.
+
+ @return The 64-bit value to write to Buffer.
+
+**/
+UINT64
+EFIAPI
+WriteUnaligned64 (
+ OUT UINT64 *Buffer,
+ IN UINT64 Value
+ )
+{
+ ASSERT (Buffer != NULL);
+
+ return *Buffer = Value;
+}
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