mirror of https://github.com/acidanthera/audk.git
71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
|
/** @file
|
||
|
|
Unaligned Port I/O. This file has compiler specifics for GCC as there is no
|
||
|
|
ANSI C standard for doing IO.
|
||
|
|
|
||
|
|
Based on IoLibGcc.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"
|
||
|
|
|
||
|
|
/**
|
||
|
|
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
|
||
|
|
)
|
||
|
|
{
|
||
|
|
__asm__ __volatile__ ( "outl %0, %1" : : "a" (Value), "d" ((UINT16)Port) );
|
||
|
|
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 Data;
|
||
|
|
__asm__ __volatile__ ( "inl %1, %0" : "=a" (Data) : "d" ((UINT16)Port) );
|
||
|
|
return Data;
|
||
|
|
}
|
||
|
|
|