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/** @file
Common I/O Library routines.
Copyright (c) 2006 - 2021, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "BaseIoLibIntrinsicInternal.h"
#include "IoLibTdx.h"
/**
Reads a 64-bit I/O port.
Reads the 64-bit I/O port specified by Port. The 64-bit read value is returned.
This function must guarantee that all I/O read and write operations are
serialized.
If 64-bit I/O port operations are not supported, then ASSERT().
If Port is not aligned on a 64-bit boundary, then ASSERT().
@param Port The I/O port to read.
@return The value read.
**/
UINT64
EFIAPI
IoRead64 (
IN UINTN Port
)
{
ASSERT (FALSE);
return 0;
}
/**
Writes a 64-bit I/O port.
Writes the 64-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 64-bit I/O port operations are not supported, then ASSERT().
If Port is not aligned on a 64-bit boundary, 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.
**/
UINT64
EFIAPI
IoWrite64 (
IN UINTN Port,
IN UINT64 Value
)
{
ASSERT (FALSE);
return 0;
}
/**
Reads an 8-bit MMIO register.
Reads the 8-bit MMIO register specified by Address. The 8-bit read value is
returned. This function must guarantee that all MMIO read and write
operations are serialized.
If 8-bit MMIO register operations are not supported, then ASSERT().
For Td guest TDVMCALL_MMIO is invoked to read MMIO registers.
@param Address The MMIO register to read.
@return The value read.
**/
UINT8
EFIAPI
MmioRead8 (
IN UINTN Address
)
{
UINT8 Value;
BOOLEAN Flag;
Flag = FilterBeforeMmIoRead (FilterWidth8, Address, &Value);
if (Flag) {
MemoryFence ();
if (IsTdxGuest ()) {
Value = TdMmioRead8 (Address);
} else {
Value = *(volatile UINT8 *)Address;
}
MemoryFence ();
}
FilterAfterMmIoRead (FilterWidth8, Address, &Value);
return Value;
}
/**
Writes an 8-bit MMIO register.
Writes the 8-bit MMIO register specified by Address with the value specified
by Value and returns Value. This function must guarantee that all MMIO read
and write operations are serialized.
If 8-bit MMIO register operations are not supported, then ASSERT().
For Td guest TDVMCALL_MMIO is invoked to write MMIO registers.
@param Address The MMIO register to write.
@param Value The value to write to the MMIO register.
@return Value.
**/
UINT8
EFIAPI
MmioWrite8 (
IN UINTN Address,
IN UINT8 Value
)
{
BOOLEAN Flag;
Flag = FilterBeforeMmIoWrite (FilterWidth8, Address, &Value);
if (Flag) {
MemoryFence ();
if (IsTdxGuest ()) {
TdMmioWrite8 (Address, Value);
} else {
*(volatile UINT8 *)Address = Value;
}
MemoryFence ();
}
FilterAfterMmIoWrite (FilterWidth8, Address, &Value);
return Value;
}
/**
Reads a 16-bit MMIO register.
Reads the 16-bit MMIO register specified by Address. The 16-bit read value is
returned. This function must guarantee that all MMIO read and write
operations are serialized.
If 16-bit MMIO register operations are not supported, then ASSERT().
If Address is not aligned on a 16-bit boundary, then ASSERT().
For Td guest TDVMCALL_MMIO is invoked to read MMIO registers.
@param Address The MMIO register to read.
@return The value read.
**/
UINT16
EFIAPI
MmioRead16 (
IN UINTN Address
)
{
UINT16 Value;
BOOLEAN Flag;
ASSERT ((Address & 1) == 0);
Flag = FilterBeforeMmIoRead (FilterWidth16, Address, &Value);
if (Flag) {
MemoryFence ();
if (IsTdxGuest ()) {
Value = TdMmioRead16 (Address);
} else {
Value = *(volatile UINT16 *)Address;
}
MemoryFence ();
}
FilterAfterMmIoRead (FilterWidth16, Address, &Value);
return Value;
}
/**
Writes a 16-bit MMIO register.
Writes the 16-bit MMIO register specified by Address with the value specified
by Value and returns Value. This function must guarantee that all MMIO read
and write operations are serialized.
If 16-bit MMIO register operations are not supported, then ASSERT().
If Address is not aligned on a 16-bit boundary, then ASSERT().
For Td guest TDVMCALL_MMIO is invoked to write MMIO registers.
@param Address The MMIO register to write.
@param Value The value to write to the MMIO register.
@return Value.
**/
UINT16
EFIAPI
MmioWrite16 (
IN UINTN Address,
IN UINT16 Value
)
{
BOOLEAN Flag;
ASSERT ((Address & 1) == 0);
Flag = FilterBeforeMmIoWrite (FilterWidth16, Address, &Value);
if (Flag) {
MemoryFence ();
if (IsTdxGuest ()) {
TdMmioWrite16 (Address, Value);
} else {
*(volatile UINT16 *)Address = Value;
}
MemoryFence ();
}
FilterAfterMmIoWrite (FilterWidth16, Address, &Value);
return Value;
}
/**
Reads a 32-bit MMIO register.
Reads the 32-bit MMIO register specified by Address. The 32-bit read value is
returned. This function must guarantee that all MMIO read and write
operations are serialized.
If 32-bit MMIO register operations are not supported, then ASSERT().
If Address is not aligned on a 32-bit boundary, then ASSERT().
For Td guest TDVMCALL_MMIO is invoked to read MMIO registers.
@param Address The MMIO register to read.
@return The value read.
**/
UINT32
EFIAPI
MmioRead32 (
IN UINTN Address
)
{
UINT32 Value;
BOOLEAN Flag;
ASSERT ((Address & 3) == 0);
Flag = FilterBeforeMmIoRead (FilterWidth32, Address, &Value);
if (Flag) {
MemoryFence ();
if (IsTdxGuest ()) {
Value = TdMmioRead32 (Address);
} else {
Value = *(volatile UINT32 *)Address;
}
MemoryFence ();
}
FilterAfterMmIoRead (FilterWidth32, Address, &Value);
return Value;
}
/**
Writes a 32-bit MMIO register.
Writes the 32-bit MMIO register specified by Address with the value specified
by Value and returns Value. This function must guarantee that all MMIO read
and write operations are serialized.
If 32-bit MMIO register operations are not supported, then ASSERT().
If Address is not aligned on a 32-bit boundary, then ASSERT().
For Td guest TDVMCALL_MMIO is invoked to write MMIO registers.
@param Address The MMIO register to write.
@param Value The value to write to the MMIO register.
@return Value.
**/
UINT32
EFIAPI
MmioWrite32 (
IN UINTN Address,
IN UINT32 Value
)
{
BOOLEAN Flag;
ASSERT ((Address & 3) == 0);
Flag = FilterBeforeMmIoWrite (FilterWidth32, Address, &Value);
if (Flag) {
MemoryFence ();
if (IsTdxGuest ()) {
TdMmioWrite32 (Address, Value);
} else {
*(volatile UINT32 *)Address = Value;
}
MemoryFence ();
}
FilterAfterMmIoWrite (FilterWidth32, Address, &Value);
return Value;
}
/**
Reads a 64-bit MMIO register.
Reads the 64-bit MMIO register specified by Address. The 64-bit read value is
returned. This function must guarantee that all MMIO read and write
operations are serialized.
If 64-bit MMIO register operations are not supported, then ASSERT().
If Address is not aligned on a 64-bit boundary, then ASSERT().
For Td guest TDVMCALL_MMIO is invoked to read MMIO registers.
@param Address The MMIO register to read.
@return The value read.
**/
UINT64
EFIAPI
MmioRead64 (
IN UINTN Address
)
{
UINT64 Value;
BOOLEAN Flag;
ASSERT ((Address & 7) == 0);
Flag = FilterBeforeMmIoRead (FilterWidth64, Address, &Value);
if (Flag) {
MemoryFence ();
if (IsTdxGuest ()) {
Value = TdMmioRead64 (Address);
} else {
Value = *(volatile UINT64 *)Address;
}
MemoryFence ();
}
FilterAfterMmIoRead (FilterWidth64, Address, &Value);
return Value;
}
/**
Writes a 64-bit MMIO register.
Writes the 64-bit MMIO register specified by Address with the value specified
by Value and returns Value. This function must guarantee that all MMIO read
and write operations are serialized.
If 64-bit MMIO register operations are not supported, then ASSERT().
If Address is not aligned on a 64-bit boundary, then ASSERT().
For Td guest TDVMCALL_MMIO is invoked to write MMIO registers.
@param Address The MMIO register to write.
@param Value The value to write to the MMIO register.
**/
UINT64
EFIAPI
MmioWrite64 (
IN UINTN Address,
IN UINT64 Value
)
{
BOOLEAN Flag;
ASSERT ((Address & 7) == 0);
Flag = FilterBeforeMmIoWrite (FilterWidth64, Address, &Value);
if (Flag) {
MemoryFence ();
if (IsTdxGuest ()) {
TdMmioWrite64 (Address, Value);
} else {
*(volatile UINT64 *)Address = Value;
}
MemoryFence ();
}
FilterAfterMmIoWrite (FilterWidth64, Address, &Value);
return Value;
}
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