/** @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 - 2021, Intel Corporation. All rights reserved.<BR> | |
SPDX-License-Identifier: BSD-2-Clause-Patent | |
**/ | |
#include "BaseIoLibIntrinsicInternal.h" | |
#include "IoLibTdx.h" | |
// | |
// 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 | |
); | |
void | |
_ReadWriteBarrier ( | |
void | |
); | |
#pragma intrinsic(_inp) | |
#pragma intrinsic(_inpw) | |
#pragma intrinsic(_inpd) | |
#pragma intrinsic(_outp) | |
#pragma intrinsic(_outpw) | |
#pragma intrinsic(_outpd) | |
#pragma intrinsic(_ReadWriteBarrier) | |
// | |
// _ReadWriteBarrier() forces memory reads and writes to complete at the point | |
// in the call. This is only a hint to the compiler and does emit code. | |
// In past versions of the compiler, _ReadWriteBarrier was enforced only | |
// locally and did not affect functions up the call tree. In Visual C++ | |
// 2005, _ReadWriteBarrier is enforced all the way up the call tree. | |
// | |
/** | |
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(). | |
For Td guest TDVMCALL_IO is invoked to read I/O port. | |
@param Port The I/O port to read. | |
@return The value read. | |
**/ | |
UINT8 | |
EFIAPI | |
IoRead8 ( | |
IN UINTN Port | |
) | |
{ | |
UINT8 Value; | |
BOOLEAN Flag; | |
Flag = FilterBeforeIoRead (FilterWidth8, Port, &Value); | |
if (Flag) { | |
if (IsTdxGuest ()) { | |
Value = TdIoRead8 (Port); | |
} else { | |
_ReadWriteBarrier (); | |
Value = (UINT8)_inp ((UINT16)Port); | |
_ReadWriteBarrier (); | |
} | |
} | |
FilterAfterIoRead (FilterWidth8, Port, &Value); | |
return Value; | |
} | |
/** | |
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(). | |
For Td guest TDVMCALL_IO is invoked to write I/O port. | |
@param Port The I/O port to write. | |
@param Value The value to write to the I/O port. | |
@return The value written to the I/O port. | |
**/ | |
UINT8 | |
EFIAPI | |
IoWrite8 ( | |
IN UINTN Port, | |
IN UINT8 Value | |
) | |
{ | |
BOOLEAN Flag; | |
Flag = FilterBeforeIoWrite (FilterWidth8, Port, &Value); | |
if (Flag) { | |
if (IsTdxGuest ()) { | |
TdIoWrite8 (Port, Value); | |
} else { | |
_ReadWriteBarrier (); | |
(UINT8)_outp ((UINT16)Port, Value); | |
_ReadWriteBarrier (); | |
} | |
} | |
FilterAfterIoWrite (FilterWidth8, Port, &Value); | |
return 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(). | |
If Port is not aligned on a 16-bit boundary, then ASSERT(). | |
For Td guest TDVMCALL_IO is invoked to read I/O port. | |
@param Port The I/O port to read. | |
@return The value read. | |
**/ | |
UINT16 | |
EFIAPI | |
IoRead16 ( | |
IN UINTN Port | |
) | |
{ | |
UINT16 Value; | |
BOOLEAN Flag; | |
ASSERT ((Port & 1) == 0); | |
Flag = FilterBeforeIoRead (FilterWidth16, Port, &Value); | |
if (Flag) { | |
if (IsTdxGuest ()) { | |
Value = TdIoRead16 (Port); | |
} else { | |
_ReadWriteBarrier (); | |
Value = _inpw ((UINT16)Port); | |
_ReadWriteBarrier (); | |
} | |
} | |
FilterBeforeIoRead (FilterWidth16, Port, &Value); | |
return Value; | |
} | |
/** | |
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(). | |
If Port is not aligned on a 16-bit boundary, then ASSERT(). | |
For Td guest TDVMCALL_IO is invoked to write I/O port. | |
@param Port The I/O port to write. | |
@param Value The value to write to the I/O port. | |
@return The value written to the I/O port. | |
**/ | |
UINT16 | |
EFIAPI | |
IoWrite16 ( | |
IN UINTN Port, | |
IN UINT16 Value | |
) | |
{ | |
BOOLEAN Flag; | |
ASSERT ((Port & 1) == 0); | |
Flag = FilterBeforeIoWrite (FilterWidth16, Port, &Value); | |
if (Flag) { | |
if (IsTdxGuest ()) { | |
TdIoWrite16 (Port, Value); | |
} else { | |
_ReadWriteBarrier (); | |
_outpw ((UINT16)Port, Value); | |
_ReadWriteBarrier (); | |
} | |
} | |
FilterAfterIoWrite (FilterWidth16, Port, &Value); | |
return 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(). | |
If Port is not aligned on a 32-bit boundary, then ASSERT(). | |
For Td guest TDVMCALL_IO is invoked to read I/O port. | |
@param Port The I/O port to read. | |
@return The value read. | |
**/ | |
UINT32 | |
EFIAPI | |
IoRead32 ( | |
IN UINTN Port | |
) | |
{ | |
UINT32 Value; | |
BOOLEAN Flag; | |
ASSERT ((Port & 3) == 0); | |
Flag = FilterBeforeIoRead (FilterWidth32, Port, &Value); | |
if (Flag) { | |
if (IsTdxGuest ()) { | |
Value = TdIoRead32 (Port); | |
} else { | |
_ReadWriteBarrier (); | |
Value = _inpd ((UINT16)Port); | |
_ReadWriteBarrier (); | |
} | |
} | |
FilterAfterIoRead (FilterWidth32, Port, &Value); | |
return Value; | |
} | |
/** | |
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(). | |
If Port is not aligned on a 32-bit boundary, then ASSERT(). | |
For Td guest TDVMCALL_IO is invoked to write I/O port. | |
@param Port The I/O port to write. | |
@param Value The value to write to the I/O port. | |
@return The value written to the I/O port. | |
**/ | |
UINT32 | |
EFIAPI | |
IoWrite32 ( | |
IN UINTN Port, | |
IN UINT32 Value | |
) | |
{ | |
BOOLEAN Flag; | |
ASSERT ((Port & 3) == 0); | |
Flag = FilterBeforeIoWrite (FilterWidth32, Port, &Value); | |
if (Flag) { | |
if (IsTdxGuest ()) { | |
TdIoWrite32 (Port, Value); | |
} else { | |
_ReadWriteBarrier (); | |
_outpd ((UINT16)Port, Value); | |
_ReadWriteBarrier (); | |
} | |
} | |
FilterAfterIoWrite (FilterWidth32, Port, &Value); | |
return Value; | |
} |