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/** @file
Unaligned port I/O. This file has compiler specifics for Microsoft C as there
is no ANSI C standard for doing IO.
Based on IoLibMsc.c
Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
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.
**/
#include "UnalignedIoInternal.h"
unsigned long _inpd (unsigned short port);
unsigned long _outpd (unsigned short port, unsigned long dataword );
void _ReadWriteBarrier (void);
/**
Performs a 32-bit write to the specified, possibly unaligned I/O-type
address.
Writes the 32-bit I/O port specified by Port with the value specified by
Value and returns Value. This function must guarantee that all I/O read and
write operations are serialized.
If 32-bit unaligned I/O port operations are not supported, then ASSERT().
@param[in] Port I/O port address
@param[in] Value 32-bit word to write
@return The value written to the I/O port.
**/
UINT32
UnalignedIoWrite32 (
IN UINTN Port,
IN UINT32 Value
)
{
_ReadWriteBarrier ();
_outpd ((UINT16)Port, Value);
_ReadWriteBarrier ();
return Value;
}
/**
Reads a 32-bit word from the specified, possibly unaligned I/O-type address.
Reads the 32-bit I/O port specified by Port. The 32-bit read value is
returned. This function must guarantee that all I/O read and write operations
are serialized.
If 32-bit unaligned I/O port operations are not supported, then ASSERT().
@param[in] Port The I/O port to read.
@return The value read.
**/
UINT32
UnalignedIoRead32 (
IN UINTN Port
)
{
UINT32 Value;
_ReadWriteBarrier ();
Value = _inpd ((UINT16)Port);
_ReadWriteBarrier ();
return Value;
}
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