/** @file | |
I/O Library. This file has compiler specifics for Microsft C as there is no | |
ANSI C standard for doing IO. | |
MSC - uses intrinsic functions and the optimize will remove the function call | |
overhead. | |
We don't advocate putting compiler specifics in libraries or drivers but there | |
is no other way to make this work. | |
Copyright (c) 2006, Intel Corporation<BR> | |
All rights reserved. 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. | |
Module Name: IoLibMsc.c | |
**/ | |
#if _MSC_EXTENSIONS | |
// | |
// Microsoft Visual Studio 7.1 Function Prototypes for I/O Intrinsics | |
// | |
int _inp (unsigned short port); | |
unsigned short _inpw (unsigned short port); | |
unsigned long _inpd (unsigned short port); | |
int _outp (unsigned short port, int databyte ); | |
unsigned short _outpw(unsigned short port, unsigned short dataword ); | |
unsigned long _outpd(unsigned short port, unsigned long dataword ); | |
#pragma intrinsic(_inp) | |
#pragma intrinsic(_inpw) | |
#pragma intrinsic(_inpd) | |
#pragma intrinsic(_outp) | |
#pragma intrinsic(_outpw) | |
#pragma intrinsic(_outpd) | |
/** | |
Reads an 8-bit I/O port. | |
Reads the 8-bit I/O port specified by Port. The 8-bit read value is returned. | |
This function must guarantee that all I/O read and write operations are | |
serialized. | |
If 8-bit I/O port operations are not supported, then ASSERT(). | |
@param Port The I/O port to read. | |
@return The value read. | |
**/ | |
UINT8 | |
EFIAPI | |
IoRead8 ( | |
IN UINTN Port | |
) | |
{ | |
return (UINT8)_inp ((UINT16)Port); | |
} | |
/** | |
Writes an 8-bit I/O port. | |
Writes the 8-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 8-bit I/O port operations are not supported, then ASSERT(). | |
@param Port The I/O port to write. | |
@param Value The value to write to the I/O port. | |
@return The value written the I/O port. | |
**/ | |
UINT8 | |
EFIAPI | |
IoWrite8 ( | |
IN UINTN Port, | |
IN UINT8 Value | |
) | |
{ | |
return (UINT8)_outp ((UINT16)Port, Value); | |
} | |
/** | |
Reads a 16-bit I/O port. | |
Reads the 16-bit I/O port specified by Port. The 16-bit read value is returned. | |
This function must guarantee that all I/O read and write operations are | |
serialized. | |
If 16-bit I/O port operations are not supported, then ASSERT(). | |
@param Port The I/O port to read. | |
@return The value read. | |
**/ | |
UINT16 | |
EFIAPI | |
IoRead16 ( | |
IN UINTN Port | |
) | |
{ | |
ASSERT ((Port & 1) == 0); | |
return _inpw((UINT16)Port); | |
} | |
/** | |
Writes a 16-bit I/O port. | |
Writes the 16-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 16-bit I/O port operations are not supported, then ASSERT(). | |
@param Port The I/O port to write. | |
@param Value The value to write to the I/O port. | |
@return The value written the I/O port. | |
**/ | |
UINT16 | |
EFIAPI | |
IoWrite16 ( | |
IN UINTN Port, | |
IN UINT16 Value | |
) | |
{ | |
ASSERT ((Port & 1) == 0); | |
return _outpw ((UINT16)Port, Value); | |
} | |
/** | |
Reads a 32-bit I/O port. | |
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 I/O port operations are not supported, then ASSERT(). | |
@param Port The I/O port to read. | |
@return The value read. | |
**/ | |
UINT32 | |
EFIAPI | |
IoRead32 ( | |
IN UINTN Port | |
) | |
{ | |
ASSERT ((Port & 3) == 0); | |
return _inpd((UINT16)Port); | |
} | |
/** | |
Writes a 32-bit I/O port. | |
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 I/O port operations are not supported, then ASSERT(). | |
@param Port The I/O port to write. | |
@param Value The value to write to the I/O port. | |
@return The value written the I/O port. | |
**/ | |
UINT32 | |
EFIAPI | |
IoWrite32 ( | |
IN UINTN Port, | |
IN UINT32 Value | |
) | |
{ | |
ASSERT ((Port & 3) == 0); | |
return _outpd ((UINT16)Port, Value); | |
} | |
#endif |