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/** @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"
#pragma pack(1)
typedef union {
UINT16 Val16;
UINT32 Val32;
UINT64 Val64;
} MISALIGNED;
#pragma pack()
STATIC_ASSERT (ALIGNOF (MISALIGNED) == 1, "Alignment error");
/**
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 VOID *Buffer
)
{
ASSERT (Buffer != NULL);
return ((CONST MISALIGNED *)Buffer)->Val16;
}
/**
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 VOID *Buffer,
IN UINT16 Value
)
{
ASSERT (Buffer != NULL);
return ((MISALIGNED *)Buffer)->Val16 = 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 VOID *Buffer
)
{
ASSERT (Buffer != NULL);
return ((UINT32)((UINT8 *)Buffer)[2] << 16) | ReadUnaligned16 (Buffer);
}
/**
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 VOID *Buffer,
IN UINT32 Value
)
{
ASSERT (Buffer != NULL);
WriteUnaligned16 (Buffer, (UINT16)Value);
((UINT8 *)Buffer)[2] = (UINT8)(Value >> 16);
return Value & 0xffffff;
}
/**
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 VOID *Buffer
)
{
ASSERT (Buffer != NULL);
return ((CONST MISALIGNED *)Buffer)->Val32;
}
/**
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 VOID *Buffer,
IN UINT32 Value
)
{
ASSERT (Buffer != NULL);
return ((MISALIGNED *)Buffer)->Val32 = 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 VOID *Buffer
)
{
ASSERT (Buffer != NULL);
return ((CONST MISALIGNED *)Buffer)->Val64;
}
/**
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 VOID *Buffer,
IN UINT64 Value
)
{
ASSERT (Buffer != NULL);
return ((MISALIGNED *)Buffer)->Val64 = Value;
}
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