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0ffa12863e
2. Added assert() for AsmFxRestore() in x86LowLevel.c of BaseLib 3. Added assert() for LongJump() in LongJump.c of BaseLib 4. Changed parameter type of Value from "IN" to "IN OUT" for InterLockedComparedExchanged32/64/pointer() functions to sync with MWG-0.55a 5. Changed functions header of all BitField functions of BaseLib, BaseIoLibIntrinsic, BasePciCf8Lib, BasePciExpressLib, BasePciLibCf8, BasePciLibPciExpressLib DxeIoLibCpuIo, PeiIoLibCpuIo etc, to follow MWG-0.55a. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@565 6f19259b-4bc3-4df7-8a09-765794883524
221 lines
5.1 KiB
C
221 lines
5.1 KiB
C
/** @file
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Unaligned access functions of BaseLib.
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Copyright (c) 2006, Intel Corporation
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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Module Name: Unaligned.c
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**/
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/**
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Reads a 16-bit value from memory that may be unaligned.
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This function returns the 16-bit value pointed to by Buffer. The function
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guarantees that the read operation does not produce an alignment fault.
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If the Buffer is NULL, then ASSERT().
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@param Buffer Pointer to a 16-bit value that may be unaligned.
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@return *Uint16
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**/
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UINT16
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EFIAPI
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ReadUnaligned16 (
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IN CONST UINT16 *Buffer
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)
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{
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ASSERT (Buffer != NULL);
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return *Buffer;
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}
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/**
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Writes a 16-bit value to memory that may be unaligned.
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This function writes the 16-bit value specified by Value to Buffer. Value is
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returned. The function guarantees that the write operation does not produce
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an alignment fault.
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If the Buffer is NULL, then ASSERT().
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@param Buffer Pointer to a 16-bit value that may be unaligned.
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@param Value 16-bit value to write to Buffer.
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@return Value
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**/
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UINT16
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EFIAPI
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WriteUnaligned16 (
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OUT UINT16 *Buffer,
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IN UINT16 Value
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)
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{
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ASSERT (Buffer != NULL);
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return *Buffer = Value;
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}
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/**
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Reads a 24-bit value from memory that may be unaligned.
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This function returns the 24-bit value pointed to by Buffer. The function
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guarantees that the read operation does not produce an alignment fault.
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If the Buffer is NULL, then ASSERT().
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@param Buffer Pointer to a 24-bit value that may be unaligned.
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@return The value read.
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**/
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UINT32
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EFIAPI
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ReadUnaligned24 (
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IN CONST UINT32 *Buffer
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)
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{
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ASSERT (Buffer != NULL);
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return *Buffer & 0xffffff;
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}
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/**
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Writes a 24-bit value to memory that may be unaligned.
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This function writes the 24-bit value specified by Value to Buffer. Value is
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returned. The function guarantees that the write operation does not produce
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an alignment fault.
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If the Buffer is NULL, then ASSERT().
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@param Buffer Pointer to a 24-bit value that may be unaligned.
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@param Value 24-bit value to write to Buffer.
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@return The value written.
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**/
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UINT32
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EFIAPI
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WriteUnaligned24 (
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OUT UINT32 *Buffer,
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IN UINT32 Value
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)
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{
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ASSERT (Buffer != NULL);
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*Buffer = BitFieldWrite32 (*Buffer, 0, 23, Value);
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return Value;
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}
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/**
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Reads a 32-bit value from memory that may be unaligned.
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This function returns the 32-bit value pointed to by Buffer. The function
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guarantees that the read operation does not produce an alignment fault.
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If the Buffer is NULL, then ASSERT().
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@param Buffer Pointer to a 32-bit value that may be unaligned.
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@return *Uint32
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**/
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UINT32
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EFIAPI
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ReadUnaligned32 (
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IN CONST UINT32 *Buffer
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)
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{
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ASSERT (Buffer != NULL);
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return *Buffer;
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}
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/**
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Writes a 32-bit value to memory that may be unaligned.
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This function writes the 32-bit value specified by Value to Buffer. Value is
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returned. The function guarantees that the write operation does not produce
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an alignment fault.
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If the Buffer is NULL, then ASSERT().
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@param Buffer Pointer to a 32-bit value that may be unaligned.
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@param Value 32-bit value to write to Buffer.
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@return Value
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**/
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UINT32
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EFIAPI
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WriteUnaligned32 (
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OUT UINT32 *Buffer,
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IN UINT32 Value
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)
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{
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ASSERT (Buffer != NULL);
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return *Buffer = Value;
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}
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/**
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Reads a 64-bit value from memory that may be unaligned.
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This function returns the 64-bit value pointed to by Buffer. The function
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guarantees that the read operation does not produce an alignment fault.
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If the Buffer is NULL, then ASSERT().
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@param Buffer Pointer to a 64-bit value that may be unaligned.
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@return *Uint64
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**/
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UINT64
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EFIAPI
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ReadUnaligned64 (
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IN CONST UINT64 *Buffer
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)
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{
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ASSERT (Buffer != NULL);
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return *Buffer;
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}
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/**
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Writes a 64-bit value to memory that may be unaligned.
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This function writes the 64-bit value specified by Value to Buffer. Value is
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returned. The function guarantees that the write operation does not produce
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an alignment fault.
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If the Buffer is NULL, then ASSERT().
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@param Buffer Pointer to a 64-bit value that may be unaligned.
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@param Value 64-bit value to write to Buffer.
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@return Value
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**/
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UINT64
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EFIAPI
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WriteUnaligned64 (
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OUT UINT64 *Buffer,
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IN UINT64 Value
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)
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{
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ASSERT (Buffer != NULL);
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return *Buffer = Value;
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}
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