/** @file | |
Unaligned port I/O. This file has compiler specifics for ICC as there | |
is no ANSI C standard for doing IO. | |
Based on IoLibIcc.c. | |
Copyright (c) 2006 - 2008, 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 { | |
mov eax, dword ptr [Value] | |
mov dx, word ptr [Port] | |
out dx, eax | |
} | |
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 { | |
mov dx, word ptr [Port] | |
in eax, dx | |
mov dword ptr [Data], eax | |
} | |
return Data; | |
} |