MdePkg/Library/BaseIoLibIntrinsic/IoLibFifo.c

   1 /** @file
   2   IoFifo read/write routines.
   3
   4   Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 #include "BaseIoLibIntrinsicInternal.h"
  10 #include "IoLibSev.h"
  11 #include "IoLibTdx.h"
  12 #include <Uefi/UefiBaseType.h>
  13 #include <Library/TdxLib.h>
  14
  15 /**
  16   Reads an 8-bit I/O port fifo into a block of memory.
  17
  18   Reads the 8-bit I/O fifo port specified by Port.
  19   The port is read Count times, and the read data is
  20   stored in the provided Buffer.
  21
  22   This function must guarantee that all I/O read and write operations are
  23   serialized.
  24
  25   If 8-bit I/O port operations are not supported, then ASSERT().
  26
  27   In TDX a serial of TdIoRead8 is invoked to read the I/O port fifo.
  28
  29   @param  Port    The I/O port to read.
  30   @param  Count   The number of times to read I/O port.
  31   @param  Buffer  The buffer to store the read data into.
  32
  33 **/
  34 VOID
  35 EFIAPI
  36 IoReadFifo8 (
  37   IN      UINTN  Port,
  38   IN      UINTN  Count,
  39   OUT     VOID   *Buffer
  40   )
  41 {
  42   if (IsTdxGuest ()) {
  43     TdIoReadFifo8 (Port, Count, Buffer);
  44   } else {
  45     SevIoReadFifo8 (Port, Count, Buffer);
  46   }
  47 }
  48
  49 /**
  50   Writes a block of memory into an 8-bit I/O port fifo.
  51
  52   Writes the 8-bit I/O fifo port specified by Port.
  53   The port is written Count times, and the write data is
  54   retrieved from the provided Buffer.
  55
  56   This function must guarantee that all I/O write and write operations are
  57   serialized.
  58
  59   If 8-bit I/O port operations are not supported, then ASSERT().
  60
  61   In TDX a serial of TdIoWrite8 is invoked to write data to the I/O port.
  62
  63   @param  Port    The I/O port to write.
  64   @param  Count   The number of times to write I/O port.
  65   @param  Buffer  The buffer to retrieve the write data from.
  66
  67 **/
  68 VOID
  69 EFIAPI
  70 IoWriteFifo8 (
  71   IN      UINTN  Port,
  72   IN      UINTN  Count,
  73   IN      VOID   *Buffer
  74   )
  75 {
  76   if (IsTdxGuest ()) {
  77     TdIoWriteFifo8 (Port, Count, Buffer);
  78   } else {
  79     SevIoWriteFifo8 (Port, Count, Buffer);
  80   }
  81 }
  82
  83 /**
  84   Reads a 16-bit I/O port fifo into a block of memory.
  85
  86   Reads the 16-bit I/O fifo port specified by Port.
  87   The port is read Count times, and the read data is
  88   stored in the provided Buffer.
  89
  90   This function must guarantee that all I/O read and write operations are
  91   serialized.
  92
  93   If 16-bit I/O port operations are not supported, then ASSERT().
  94
  95   In TDX a serial of TdIoRead16 is invoked to read data from the I/O port.
  96
  97   @param  Port    The I/O port to read.
  98   @param  Count   The number of times to read I/O port.
  99   @param  Buffer  The buffer to store the read data into.
 100
 101 **/
 102 VOID
 103 EFIAPI
 104 IoReadFifo16 (
 105   IN      UINTN  Port,
 106   IN      UINTN  Count,
 107   OUT     VOID   *Buffer
 108   )
 109 {
 110   if (IsTdxGuest ()) {
 111     TdIoReadFifo16 (Port, Count, Buffer);
 112   } else {
 113     SevIoReadFifo16 (Port, Count, Buffer);
 114   }
 115 }
 116
 117 /**
 118   Writes a block of memory into a 16-bit I/O port fifo.
 119
 120   Writes the 16-bit I/O fifo port specified by Port.
 121   The port is written Count times, and the write data is
 122   retrieved from the provided Buffer.
 123
 124   This function must guarantee that all I/O write and write operations are
 125   serialized.
 126
 127   If 16-bit I/O port operations are not supported, then ASSERT().
 128
 129   In TDX a serial of TdIoWrite16 is invoked to write data to the I/O port.
 130
 131   @param  Port    The I/O port to write.
 132   @param  Count   The number of times to write I/O port.
 133   @param  Buffer  The buffer to retrieve the write data from.
 134
 135 **/
 136 VOID
 137 EFIAPI
 138 IoWriteFifo16 (
 139   IN      UINTN  Port,
 140   IN      UINTN  Count,
 141   IN      VOID   *Buffer
 142   )
 143 {
 144   if (IsTdxGuest ()) {
 145     TdIoWriteFifo16 (Port, Count, Buffer);
 146   } else {
 147     SevIoWriteFifo16 (Port, Count, Buffer);
 148   }
 149 }
 150
 151 /**
 152   Reads a 32-bit I/O port fifo into a block of memory.
 153
 154   Reads the 32-bit I/O fifo port specified by Port.
 155   The port is read Count times, and the read data is
 156   stored in the provided Buffer.
 157
 158   This function must guarantee that all I/O read and write operations are
 159   serialized.
 160
 161   If 32-bit I/O port operations are not supported, then ASSERT().
 162
 163   In TDX a serial of TdIoRead32 is invoked to read data from the I/O port.
 164
 165   @param  Port    The I/O port to read.
 166   @param  Count   The number of times to read I/O port.
 167   @param  Buffer  The buffer to store the read data into.
 168
 169 **/
 170 VOID
 171 EFIAPI
 172 IoReadFifo32 (
 173   IN      UINTN  Port,
 174   IN      UINTN  Count,
 175   OUT     VOID   *Buffer
 176   )
 177 {
 178   if (IsTdxGuest ()) {
 179     TdIoReadFifo32 (Port, Count, Buffer);
 180   } else {
 181     SevIoReadFifo32 (Port, Count, Buffer);
 182   }
 183 }
 184
 185 /**
 186   Writes a block of memory into a 32-bit I/O port fifo.
 187
 188   Writes the 32-bit I/O fifo port specified by Port.
 189   The port is written Count times, and the write data is
 190   retrieved from the provided Buffer.
 191
 192   This function must guarantee that all I/O write and write operations are
 193   serialized.
 194
 195   If 32-bit I/O port operations are not supported, then ASSERT().
 196
 197   In TDX a serial of TdIoWrite32 is invoked to write data to the I/O port.
 198
 199   @param  Port    The I/O port to write.
 200   @param  Count   The number of times to write I/O port.
 201   @param  Buffer  The buffer to retrieve the write data from.
 202
 203 **/
 204 VOID
 205 EFIAPI
 206 IoWriteFifo32 (
 207   IN      UINTN  Port,
 208   IN      UINTN  Count,
 209   IN      VOID   *Buffer
 210   )
 211 {
 212   if (IsTdxGuest ()) {
 213     TdIoWriteFifo32 (Port, Count, Buffer);
 214   } else {
 215     SevIoWriteFifo32 (Port, Count, Buffer);
 216   }
 217 }