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system76-edk2/MdePkg/Library/BaseIoLibIntrinsic/IoLibInternalTdxNull.c
Min Xu ab9d790901 MdePkg: Add helper functions for Tdx guest in BaseIoLibIntrinsic 
RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3429

Intel TDX architecture does not prescribe a specific software convention
to perform I/O from the guest TD. Guest TD providers have many choices to
provide I/O to the guest. The common I/O models are emulated devices,
para-virtualized devices, SRIOV devices and Direct Device assignments.

TDVF chooses para-virtualized I/O (Choice-A) which use the TDG.VP.VMCALL
function to invoke the funtions provided by the host VMM to perform I/O.
Another choice (Choice-B) is the emulation performed by the #VE handler.

There are 2 benefits of para-virtualized I/O:
1. Performance.
   VMEXIT/VMENTRY is skipped so that the performance is better than #VE
   handler.
2. De-couple with #VE handler.
   Choice-B depends on the #VE handler which means I/O is not available
   until #VE handler is installed. For example, in PEI phase #VE handler
   is installed in CpuMpPei, while communication with Qemu (via I/O port)
   happen earlier than it.

IoLibInternalTdx.c provides the helper functions for Tdx guest.
IoLibInternalTdxNull.c provides the null version of the helper functions.
It is included in the Non-X64 IoLib so that the build will not be broken.

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>
2022-04-02 08:15:12 +00:00

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/** @file
Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Library/BaseLib.h>
#include "BaseIoLibIntrinsicInternal.h"
#include "IoLibTdx.h"
/**
Check if it is Tdx guest.
@return TRUE It is Tdx guest
@return FALSE It is not Tdx guest
**/
BOOLEAN
EFIAPI
IsTdxGuest (
VOID
)
{
return FALSE;
}
/**
Reads an 8-bit I/O port.
TDVMCALL_IO is invoked to read I/O port.
@param Port The I/O port to read.
@return The value read.
**/
UINT8
EFIAPI
TdIoRead8 (
IN UINTN Port
)
{
ASSERT (FALSE);
return 0;
}
/**
Reads a 16-bit I/O port.
TDVMCALL_IO is invoked to write I/O port.
@param Port The I/O port to read.
@return The value read.
**/
UINT16
EFIAPI
TdIoRead16 (
IN UINTN Port
)
{
ASSERT (FALSE);
return 0;
}
/**
Reads a 32-bit I/O port.
TDVMCALL_IO is invoked to read I/O port.
@param Port The I/O port to read.
@return The value read.
**/
UINT32
EFIAPI
TdIoRead32 (
IN UINTN Port
)
{
ASSERT (FALSE);
return 0;
}
/**
Writes an 8-bit I/O port.
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 the I/O port.
**/
UINT8
EFIAPI
TdIoWrite8 (
IN UINTN Port,
IN UINT8 Value
)
{
ASSERT (FALSE);
return 0;
}
/**
Writes a 16-bit I/O port.
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 the I/O port.
**/
UINT16
EFIAPI
TdIoWrite16 (
IN UINTN Port,
IN UINT16 Value
)
{
ASSERT (FALSE);
return 0;
}
/**
Writes a 32-bit I/O port.
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 the I/O port.
**/
UINT32
EFIAPI
TdIoWrite32 (
IN UINTN Port,
IN UINT32 Value
)
{
ASSERT (FALSE);
return 0;
}
/**
Reads an 8-bit MMIO register.
TDVMCALL_MMIO is invoked to read MMIO registers.
@param Address The MMIO register to read.
@return The value read.
**/
UINT8
EFIAPI
TdMmioRead8 (
IN UINTN Address
)
{
ASSERT (FALSE);
return 0;
}
/**
Writes an 8-bit MMIO register.
TDVMCALL_MMIO is invoked to read write registers.
@param Address The MMIO register to write.
@param Value The value to write to the MMIO register.
@return Value.
**/
UINT8
EFIAPI
TdMmioWrite8 (
IN UINTN Address,
IN UINT8 Val
)
{
ASSERT (FALSE);
return 0;
}
/**
Reads a 16-bit MMIO register.
TDVMCALL_MMIO is invoked to read MMIO registers.
@param Address The MMIO register to read.
@return The value read.
**/
UINT16
EFIAPI
TdMmioRead16 (
IN UINTN Address
)
{
ASSERT (FALSE);
return 0;
}
/**
Writes a 16-bit MMIO register.
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
TdMmioWrite16 (
IN UINTN Address,
IN UINT16 Val
)
{
ASSERT (FALSE);
return 0;
}
/**
Reads a 32-bit MMIO register.
TDVMCALL_MMIO is invoked to read MMIO registers.
@param Address The MMIO register to read.
@return The value read.
**/
UINT32
EFIAPI
TdMmioRead32 (
IN UINTN Address
)
{
ASSERT (FALSE);
return 0;
}
/**
Writes a 32-bit MMIO register.
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
TdMmioWrite32 (
IN UINTN Address,
IN UINT32 Val
)
{
ASSERT (FALSE);
return 0;
}
/**
Reads a 64-bit MMIO register.
TDVMCALL_MMIO is invoked to read MMIO registers.
@param Address The MMIO register to read.
@return The value read.
**/
UINT64
EFIAPI
TdMmioRead64 (
IN UINTN Address
)
{
ASSERT (FALSE);
return 0;
}
/**
Writes a 64-bit MMIO register.
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
TdMmioWrite64 (
IN UINTN Address,
IN UINT64 Value
)
{
ASSERT (FALSE);
return 0;
}
/**
Reads an 8-bit I/O port fifo into a block of memory.
Reads the 8-bit I/O fifo port specified by Port.
The port is read Count times, and the read data is
stored in the provided Buffer.
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().
In TDX a serial of TdIoRead8 is invoked to read the I/O port fifo.
@param Port The I/O port to read.
@param Count The number of times to read I/O port.
@param Buffer The buffer to store the read data into.
**/
VOID
EFIAPI
TdIoReadFifo8 (
IN UINTN Port,
IN UINTN Count,
OUT VOID *Buffer
)
{
ASSERT (FALSE);
}
/**
Writes a block of memory into an 8-bit I/O port fifo.
Writes the 8-bit I/O fifo port specified by Port.
The port is written Count times, and the write data is
retrieved from the provided Buffer.
This function must guarantee that all I/O write and write operations are
serialized.
If 8-bit I/O port operations are not supported, then ASSERT().
In TDX a serial of TdIoWrite8 is invoked to write data to the I/O port.
@param Port The I/O port to write.
@param Count The number of times to write I/O port.
@param Buffer The buffer to retrieve the write data from.
**/
VOID
EFIAPI
TdIoWriteFifo8 (
IN UINTN Port,
IN UINTN Count,
IN VOID *Buffer
)
{
ASSERT (FALSE);
}
/**
Reads a 16-bit I/O port fifo into a block of memory.
Reads the 16-bit I/O fifo port specified by Port.
The port is read Count times, and the read data is
stored in the provided Buffer.
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().
In TDX a serial of TdIoRead16 is invoked to read data from the I/O port.
@param Port The I/O port to read.
@param Count The number of times to read I/O port.
@param Buffer The buffer to store the read data into.
**/
VOID
EFIAPI
TdIoReadFifo16 (
IN UINTN Port,
IN UINTN Count,
OUT VOID *Buffer
)
{
ASSERT (FALSE);
}
/**
Writes a block of memory into a 16-bit I/O port fifo.
Writes the 16-bit I/O fifo port specified by Port.
The port is written Count times, and the write data is
retrieved from the provided Buffer.
This function must guarantee that all I/O write and write operations are
serialized.
If 16-bit I/O port operations are not supported, then ASSERT().
In TDX a serial of TdIoWrite16 is invoked to write data to the I/O port.
@param Port The I/O port to write.
@param Count The number of times to write I/O port.
@param Buffer The buffer to retrieve the write data from.
**/
VOID
EFIAPI
TdIoWriteFifo16 (
IN UINTN Port,
IN UINTN Count,
IN VOID *Buffer
)
{
ASSERT (FALSE);
}
/**
Reads a 32-bit I/O port fifo into a block of memory.
Reads the 32-bit I/O fifo port specified by Port.
The port is read Count times, and the read data is
stored in the provided Buffer.
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().
In TDX a serial of TdIoRead32 is invoked to read data from the I/O port.
@param Port The I/O port to read.
@param Count The number of times to read I/O port.
@param Buffer The buffer to store the read data into.
**/
VOID
EFIAPI
TdIoReadFifo32 (
IN UINTN Port,
IN UINTN Count,
OUT VOID *Buffer
)
{
ASSERT (FALSE);
}
/**
Writes a block of memory into a 32-bit I/O port fifo.
Writes the 32-bit I/O fifo port specified by Port.
The port is written Count times, and the write data is
retrieved from the provided Buffer.
This function must guarantee that all I/O write and write operations are
serialized.
If 32-bit I/O port operations are not supported, then ASSERT().
In TDX a serial of TdIoWrite32 is invoked to write data to the I/O port.
@param Port The I/O port to write.
@param Count The number of times to write I/O port.
@param Buffer The buffer to retrieve the write data from.
**/
VOID
EFIAPI
TdIoWriteFifo32 (
IN UINTN Port,
IN UINTN Count,
IN VOID *Buffer
)
{
ASSERT (FALSE);
}
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