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253 lines
6.2 KiB
253 lines
6.2 KiB
/** @file
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Unaligned access functions of BaseLib for ARM.
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volatile was added to work around optimization issues.
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Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
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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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**/
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#include "BaseLibInternals.h"
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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 The pointer to a 16-bit value that may be unaligned.
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@return The 16-bit value read from Buffer.
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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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volatile UINT8 LowerByte;
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volatile UINT8 HigherByte;
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ASSERT (Buffer != NULL);
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LowerByte = ((UINT8*)Buffer)[0];
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HigherByte = ((UINT8*)Buffer)[1];
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return (UINT16)(LowerByte | (HigherByte << 8));
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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 The 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 The 16-bit value to write to Buffer.
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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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((volatile UINT8*)Buffer)[0] = (UINT8)Value;
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((volatile UINT8*)Buffer)[1] = (UINT8)(Value >> 8);
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return 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 The pointer to a 24-bit value that may be unaligned.
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@return The 24-bit value read from Buffer.
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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 (UINT32)(
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ReadUnaligned16 ((UINT16*)Buffer) |
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(((UINT8*)Buffer)[2] << 16)
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);
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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 The 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 24-bit value to write to Buffer.
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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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WriteUnaligned16 ((UINT16*)Buffer, (UINT16)Value);
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*(UINT8*)((UINT16*)Buffer + 1) = (UINT8)(Value >> 16);
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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 The pointer to a 32-bit value that may be unaligned.
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@return The 32-bit value read from Buffer.
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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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UINT16 LowerBytes;
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UINT16 HigherBytes;
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ASSERT (Buffer != NULL);
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LowerBytes = ReadUnaligned16 ((UINT16*) Buffer);
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HigherBytes = ReadUnaligned16 ((UINT16*) Buffer + 1);
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return (UINT32) (LowerBytes | (HigherBytes << 16));
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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 The 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 The 32-bit value to write to Buffer.
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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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WriteUnaligned16 ((UINT16*)Buffer, (UINT16)Value);
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WriteUnaligned16 ((UINT16*)Buffer + 1, (UINT16)(Value >> 16));
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return 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 The pointer to a 64-bit value that may be unaligned.
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@return The 64-bit value read from Buffer.
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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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UINT32 LowerBytes;
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UINT32 HigherBytes;
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ASSERT (Buffer != NULL);
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LowerBytes = ReadUnaligned32 ((UINT32*) Buffer);
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HigherBytes = ReadUnaligned32 ((UINT32*) Buffer + 1);
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return (UINT64) (LowerBytes | LShiftU64 (HigherBytes, 32));
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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 The 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 The 64-bit value to write to Buffer.
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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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WriteUnaligned32 ((UINT32*)Buffer, (UINT32)Value);
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WriteUnaligned32 ((UINT32*)Buffer + 1, (UINT32)RShiftU64 (Value, 32));
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return Value;
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}
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