MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciRootBridge.h

   1 /** @file
   2
   3   The PCI Root Bridge header file.
   4
   5 Copyright (c) 1999 - 2018, Intel Corporation. All rights reserved.<BR>
   6 SPDX-License-Identifier: BSD-2-Clause-Patent
   7
   8 **/
   9
  10 #ifndef _PCI_ROOT_BRIDGE_H_
  11 #define _PCI_ROOT_BRIDGE_H_
  12
  13 #include <PiDxe.h>
  14 #include <IndustryStandard/Acpi.h>
  15 #include <IndustryStandard/Pci.h>
  16
  17 //
  18 // Driver Consumed Protocol Prototypes
  19 //
  20 #include <Protocol/CpuIo2.h>
  21 #include <Protocol/DevicePath.h>
  22 #include <Protocol/PciRootBridgeIo.h>
  23 #include <Library/DebugLib.h>
  24 #include <Library/DevicePathLib.h>
  25 #include <Library/BaseMemoryLib.h>
  26 #include <Library/DxeServicesTableLib.h>
  27 #include <Library/UefiBootServicesTableLib.h>
  28 #include <Library/BaseLib.h>
  29 #include <Library/PciSegmentLib.h>
  30 #include <Library/UefiLib.h>
  31 #include <Library/TimerLib.h>
  32 #include "PciHostResource.h"
  33
  34
  35 typedef enum {
  36   IoOperation,
  37   MemOperation,
  38   PciOperation
  39 } OPERATION_TYPE;
  40
  41 #define MAP_INFO_SIGNATURE  SIGNATURE_32 ('_', 'm', 'a', 'p')
  42 typedef struct {
  43   UINT32                                    Signature;
  44   LIST_ENTRY                                Link;
  45   EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_OPERATION Operation;
  46   UINTN                                     NumberOfBytes;
  47   UINTN                                     NumberOfPages;
  48   EFI_PHYSICAL_ADDRESS                      HostAddress;
  49   EFI_PHYSICAL_ADDRESS                      MappedHostAddress;
  50 } MAP_INFO;
  51 #define MAP_INFO_FROM_LINK(a) CR (a, MAP_INFO, Link, MAP_INFO_SIGNATURE)
  52
  53 #define PCI_ROOT_BRIDGE_SIGNATURE SIGNATURE_32 ('_', 'p', 'r', 'b')
  54
  55 typedef struct {
  56   UINT32                            Signature;
  57   LIST_ENTRY                        Link;
  58   EFI_HANDLE                        Handle;
  59   UINT64                            AllocationAttributes;
  60   UINT64                            Attributes;
  61   UINT64                            Supports;
  62   PCI_RES_NODE                      ResAllocNode[TypeMax];
  63   PCI_ROOT_BRIDGE_APERTURE          Bus;
  64   PCI_ROOT_BRIDGE_APERTURE          Io;
  65   PCI_ROOT_BRIDGE_APERTURE          Mem;
  66   PCI_ROOT_BRIDGE_APERTURE          PMem;
  67   PCI_ROOT_BRIDGE_APERTURE          MemAbove4G;
  68   PCI_ROOT_BRIDGE_APERTURE          PMemAbove4G;
  69   BOOLEAN                           DmaAbove4G;
  70   BOOLEAN                           NoExtendedConfigSpace;
  71   VOID                              *ConfigBuffer;
  72   EFI_DEVICE_PATH_PROTOCOL          *DevicePath;
  73   CHAR16                            *DevicePathStr;
  74   EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL   RootBridgeIo;
  75
  76   BOOLEAN                           ResourceSubmitted;
  77   LIST_ENTRY                        Maps;
  78 } PCI_ROOT_BRIDGE_INSTANCE;
  79
  80 #define ROOT_BRIDGE_FROM_THIS(a) CR (a, PCI_ROOT_BRIDGE_INSTANCE, RootBridgeIo, PCI_ROOT_BRIDGE_SIGNATURE)
  81
  82 #define ROOT_BRIDGE_FROM_LINK(a) CR (a, PCI_ROOT_BRIDGE_INSTANCE, Link, PCI_ROOT_BRIDGE_SIGNATURE)
  83
  84 /**
  85   Construct the Pci Root Bridge instance.
  86
  87   @param Bridge            The root bridge instance.
  88
  89   @return The pointer to PCI_ROOT_BRIDGE_INSTANCE just created
  90           or NULL if creation fails.
  91 **/
  92 PCI_ROOT_BRIDGE_INSTANCE *
  93 CreateRootBridge (
  94   IN PCI_ROOT_BRIDGE       *Bridge
  95   );
  96
  97 //
  98 // Protocol Member Function Prototypes
  99 //
 100 /**
 101
 102   Poll an address in memory mapped space until an exit condition is met
 103   or a timeout occurs.
 104
 105   @param This     -  Pointer to EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL instance.
 106   @param Width    -  Width of the memory operation.
 107   @param Address  -  The base address of the memory operation.
 108   @param Mask     -  Mask used for polling criteria.
 109   @param Value    -  Comparison value used for polling exit criteria.
 110   @param Delay    -  Number of 100ns units to poll.
 111   @param Result   -  Pointer to the last value read from memory location.
 112
 113   @retval EFI_SUCCESS            -  Success.
 114   @retval EFI_INVALID_PARAMETER  -  Invalid parameter found.
 115   @retval EFI_TIMEOUT            -  Delay expired before a match occurred.
 116   @retval EFI_OUT_OF_RESOURCES   -  Fail due to lack of resources.
 117
 118 **/
 119 EFI_STATUS
 120 EFIAPI
 121 RootBridgeIoPollMem (
 122   IN  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL        *This,
 123   IN  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH  Width,
 124   IN  UINT64                                 Address,
 125   IN  UINT64                                 Mask,
 126   IN  UINT64                                 Value,
 127   IN  UINT64                                 Delay,
 128   OUT UINT64                                 *Result
 129   )
 130 ;
 131
 132 /**
 133
 134   Poll an address in I/O space until an exit condition is met
 135   or a timeout occurs.
 136
 137   @param This     -  Pointer to EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL instance.
 138   @param Width    -  Width of I/O operation.
 139   @param Address  -  The base address of the I/O operation.
 140   @param Mask     -  Mask used for polling criteria.
 141   @param Value    -  Comparison value used for polling exit criteria.
 142   @param Delay    -  Number of 100ns units to poll.
 143   @param Result   -  Pointer to the last value read from memory location.
 144
 145   @retval EFI_SUCCESS            -  Success.
 146   @retval EFI_INVALID_PARAMETER  -  Invalid parameter found.
 147   @retval EFI_TIMEOUT            -  Delay expired before a match occurred.
 148   @retval EFI_OUT_OF_RESOURCES   -  Fail due to lack of resources.
 149
 150 **/
 151 EFI_STATUS
 152 EFIAPI
 153 RootBridgeIoPollIo (
 154   IN  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL        *This,
 155   IN  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH  Width,
 156   IN  UINT64                                 Address,
 157   IN  UINT64                                 Mask,
 158   IN  UINT64                                 Value,
 159   IN  UINT64                                 Delay,
 160   OUT UINT64                                 *Result
 161   )
 162 ;
 163
 164 /**
 165
 166   Allow read from memory mapped I/O space.
 167
 168   @param This     -  Pointer to EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL instance.
 169   @param Width    -  The width of memory operation.
 170   @param Address  -  Base address of the memory operation.
 171   @param Count    -  Number of memory opeartion to perform.
 172   @param Buffer   -  The destination buffer to store data.
 173
 174   @retval EFI_SUCCESS            -  Success.
 175   @retval EFI_INVALID_PARAMETER  -  Invalid parameter found.
 176   @retval EFI_OUT_OF_RESOURCES   -  Fail due to lack of resources.
 177
 178 **/
 179 EFI_STATUS
 180 EFIAPI
 181 RootBridgeIoMemRead (
 182   IN     EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL        *This,
 183   IN     EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH  Width,
 184   IN     UINT64                                 Address,
 185   IN     UINTN                                  Count,
 186   IN OUT VOID                                   *Buffer
 187   )
 188 ;
 189
 190 /**
 191
 192   Allow write to memory mapped I/O space.
 193
 194   @param This     -  Pointer to EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL instance.
 195   @param Width    -  The width of memory operation.
 196   @param Address  -  Base address of the memory operation.
 197   @param Count    -  Number of memory opeartion to perform.
 198   @param Buffer   -  The source buffer to write data from.
 199
 200   @retval EFI_SUCCESS            -  Success.
 201   @retval EFI_INVALID_PARAMETER  -  Invalid parameter found.
 202   @retval EFI_OUT_OF_RESOURCES   -  Fail due to lack of resources.
 203
 204 **/
 205 EFI_STATUS
 206 EFIAPI
 207 RootBridgeIoMemWrite (
 208   IN     EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL        *This,
 209   IN     EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH  Width,
 210   IN     UINT64                                 Address,
 211   IN     UINTN                                  Count,
 212   IN OUT VOID                                   *Buffer
 213   )
 214 ;
 215
 216 /**
 217
 218   Enable a PCI driver to read PCI controller registers in the
 219   PCI root bridge I/O space.
 220
 221   @param This         -  A pointer to EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL
 222   @param Width        -  Signifies the width of the memory operation.
 223   @param UserAddress  -  The base address of the I/O operation.
 224   @param Count        -  The number of I/O operations to perform.
 225   @param UserBuffer   -  The destination buffer to store the results.
 226
 227   @retval EFI_SUCCESS            -  The data was read from the PCI root bridge.
 228   @retval EFI_INVALID_PARAMETER  -  Invalid parameters found.
 229   @retval EFI_OUT_OF_RESOURCES   -  The request could not be completed due to a lack of
 230                             @retval resources.
 231 **/
 232 EFI_STATUS
 233 EFIAPI
 234 RootBridgeIoIoRead (
 235   IN     EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL        *This,
 236   IN     EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH  Width,
 237   IN     UINT64                                 UserAddress,
 238   IN     UINTN                                  Count,
 239   IN OUT VOID                                   *UserBuffer
 240   )
 241 ;
 242
 243 /**
 244
 245   Enable a PCI driver to write to PCI controller registers in the
 246   PCI root bridge I/O space.
 247
 248   @param This         -  A pointer to EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL
 249   @param Width        -  Signifies the width of the memory operation.
 250   @param UserAddress  -  The base address of the I/O operation.
 251   @param Count        -  The number of I/O operations to perform.
 252   @param UserBuffer   -  The source buffer to write data from.
 253
 254   @retval EFI_SUCCESS            -  The data was written to the PCI root bridge.
 255   @retval EFI_INVALID_PARAMETER  -  Invalid parameters found.
 256   @retval EFI_OUT_OF_RESOURCES   -  The request could not be completed due to a lack of
 257                             @retval resources.
 258 **/
 259 EFI_STATUS
 260 EFIAPI
 261 RootBridgeIoIoWrite (
 262   IN     EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL        *This,
 263   IN     EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH  Width,
 264   IN     UINT64                                 UserAddress,
 265   IN     UINTN                                  Count,
 266   IN OUT VOID                                   *UserBuffer
 267   )
 268 ;
 269
 270 /**
 271
 272   Copy one region of PCI root bridge memory space to be copied to
 273   another region of PCI root bridge memory space.
 274
 275   @param This         -  A pointer to EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL instance.
 276   @param Width        -  Signifies the width of the memory operation.
 277   @param DestAddress  -  Destination address of the memory operation.
 278   @param SrcAddress   -  Source address of the memory operation.
 279   @param Count        -  Number of memory operations to perform.
 280
 281   @retval EFI_SUCCESS            -  The data was copied successfully.
 282   @retval EFI_INVALID_PARAMETER  -  Invalid parameters found.
 283   @retval EFI_OUT_OF_RESOURCES   -  The request could not be completed due to a lack of
 284                             @retval resources.
 285 **/
 286 EFI_STATUS
 287 EFIAPI
 288 RootBridgeIoCopyMem (
 289   IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL          *This,
 290   IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH    Width,
 291   IN UINT64                                   DestAddress,
 292   IN UINT64                                   SrcAddress,
 293   IN UINTN                                    Count
 294   )
 295 ;
 296
 297 /**
 298
 299   Allows read from PCI configuration space.
 300
 301   @param This     -  A pointer to EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL
 302   @param Width    -  Signifies the width of the memory operation.
 303   @param Address  -  The address within the PCI configuration space
 304                      for the PCI controller.
 305   @param Count    -  The number of PCI configuration operations
 306                      to perform.
 307   @param Buffer   -  The destination buffer to store the results.
 308
 309   @retval EFI_SUCCESS            -  The data was read from the PCI root bridge.
 310   @retval EFI_INVALID_PARAMETER  -  Invalid parameters found.
 311   @retval EFI_OUT_OF_RESOURCES   -  The request could not be completed due to a lack of
 312                             @retval resources.
 313 **/
 314 EFI_STATUS
 315 EFIAPI
 316 RootBridgeIoPciRead (
 317   IN     EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL        *This,
 318   IN     EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH  Width,
 319   IN     UINT64                                 Address,
 320   IN     UINTN                                  Count,
 321   IN OUT VOID                                   *Buffer
 322   )
 323 ;
 324
 325 /**
 326
 327   Allows write to PCI configuration space.
 328
 329   @param This     -  A pointer to EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL
 330   @param Width    -  Signifies the width of the memory operation.
 331   @param Address  -  The address within the PCI configuration space
 332                      for the PCI controller.
 333   @param Count    -  The number of PCI configuration operations
 334                      to perform.
 335   @param Buffer   -  The source buffer to get the results.
 336
 337   @retval EFI_SUCCESS            -  The data was written to the PCI root bridge.
 338   @retval EFI_INVALID_PARAMETER  -  Invalid parameters found.
 339   @retval EFI_OUT_OF_RESOURCES   -  The request could not be completed due to a lack of
 340                             @retval resources.
 341 **/
 342 EFI_STATUS
 343 EFIAPI
 344 RootBridgeIoPciWrite (
 345   IN     EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL        *This,
 346   IN     EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH  Width,
 347   IN     UINT64                                 Address,
 348   IN     UINTN                                  Count,
 349   IN OUT VOID                                   *Buffer
 350   )
 351 ;
 352
 353 /**
 354   Provides the PCI controller-specific address needed to access
 355   system memory for DMA.
 356
 357   @param This           A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
 358   @param Operation      Indicate if the bus master is going to read or write
 359                         to system memory.
 360   @param HostAddress    The system memory address to map on the PCI controller.
 361   @param NumberOfBytes  On input the number of bytes to map.
 362                         On output the number of bytes that were mapped.
 363   @param DeviceAddress  The resulting map address for the bus master PCI
 364                         controller to use to access the system memory's HostAddress.
 365   @param Mapping        The value to pass to Unmap() when the bus master DMA
 366                         operation is complete.
 367
 368   @retval EFI_SUCCESS            Success.
 369   @retval EFI_INVALID_PARAMETER  Invalid parameters found.
 370   @retval EFI_UNSUPPORTED        The HostAddress cannot be mapped as a common buffer.
 371   @retval EFI_DEVICE_ERROR       The System hardware could not map the requested address.
 372   @retval EFI_OUT_OF_RESOURCES   The request could not be completed due to lack of resources.
 373 **/
 374 EFI_STATUS
 375 EFIAPI
 376 RootBridgeIoMap (
 377   IN     EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL            *This,
 378   IN     EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_OPERATION  Operation,
 379   IN     VOID                                       *HostAddress,
 380   IN OUT UINTN                                      *NumberOfBytes,
 381   OUT    EFI_PHYSICAL_ADDRESS                       *DeviceAddress,
 382   OUT    VOID                                       **Mapping
 383   )
 384 ;
 385
 386 /**
 387   Completes the Map() operation and releases any corresponding resources.
 388
 389   The Unmap() function completes the Map() operation and releases any
 390   corresponding resources.
 391   If the operation was an EfiPciOperationBusMasterWrite or
 392   EfiPciOperationBusMasterWrite64, the data is committed to the target system
 393   memory.
 394   Any resources used for the mapping are freed.
 395
 396   @param[in] This      A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
 397   @param[in] Mapping   The mapping value returned from Map().
 398
 399   @retval EFI_SUCCESS            The range was unmapped.
 400   @retval EFI_INVALID_PARAMETER  Mapping is not a value that was returned by Map().
 401   @retval EFI_DEVICE_ERROR       The data was not committed to the target system memory.
 402 **/
 403 EFI_STATUS
 404 EFIAPI
 405 RootBridgeIoUnmap (
 406   IN  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL  *This,
 407   IN  VOID                             *Mapping
 408   )
 409 ;
 410
 411 /**
 412   Allocates pages that are suitable for an EfiPciOperationBusMasterCommonBuffer
 413   or EfiPciOperationBusMasterCommonBuffer64 mapping.
 414
 415   @param This        A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
 416   @param Type        This parameter is not used and must be ignored.
 417   @param MemoryType  The type of memory to allocate, EfiBootServicesData or
 418                      EfiRuntimeServicesData.
 419   @param Pages       The number of pages to allocate.
 420   @param HostAddress A pointer to store the base system memory address of the
 421                      allocated range.
 422   @param Attributes  The requested bit mask of attributes for the allocated
 423                      range. Only the attributes
 424                      EFI_PCI_ATTRIBUTE_MEMORY_WRITE_COMBINE,
 425                      EFI_PCI_ATTRIBUTE_MEMORY_CACHED, and
 426                      EFI_PCI_ATTRIBUTE_DUAL_ADDRESS_CYCLE may be used with this
 427                      function.
 428
 429   @retval EFI_SUCCESS            The requested memory pages were allocated.
 430   @retval EFI_INVALID_PARAMETER  MemoryType is invalid.
 431   @retval EFI_INVALID_PARAMETER  HostAddress is NULL.
 432   @retval EFI_UNSUPPORTED        Attributes is unsupported. The only legal
 433                                  attribute bits are MEMORY_WRITE_COMBINE,
 434                                  MEMORY_CACHED, and DUAL_ADDRESS_CYCLE.
 435   @retval EFI_OUT_OF_RESOURCES   The memory pages could not be allocated.
 436 **/
 437 EFI_STATUS
 438 EFIAPI
 439 RootBridgeIoAllocateBuffer (
 440   IN  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL  *This,
 441   IN  EFI_ALLOCATE_TYPE                Type,
 442   IN  EFI_MEMORY_TYPE                  MemoryType,
 443   IN  UINTN                            Pages,
 444   OUT VOID                             **HostAddress,
 445   IN  UINT64                           Attributes
 446   )
 447 ;
 448
 449 /**
 450
 451   Free memory allocated in AllocateBuffer.
 452
 453   @param This         -  Pointer to EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL
 454                          instance.
 455   @param Pages        -  Number of pages to free.
 456   @param HostAddress  -  The base system memory address of the
 457                          allocated range.
 458
 459   @retval EFI_SUCCESS            -  Requested memory pages were freed.
 460   @retval EFI_INVALID_PARAMETER  -  Invalid parameter found.
 461
 462 **/
 463 EFI_STATUS
 464 EFIAPI
 465 RootBridgeIoFreeBuffer (
 466   IN  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL  *This,
 467   IN  UINTN                            Pages,
 468   OUT VOID                             *HostAddress
 469   )
 470 ;
 471
 472 /**
 473
 474   Flushes all PCI posted write transactions from a PCI host
 475   bridge to system memory.
 476
 477   @param This  - Pointer to EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL instance.
 478
 479   @retval EFI_SUCCESS       -  PCI posted write transactions were flushed
 480                        @retval from PCI host bridge to system memory.
 481   @retval EFI_DEVICE_ERROR  -  Fail due to hardware error.
 482
 483 **/
 484 EFI_STATUS
 485 EFIAPI
 486 RootBridgeIoFlush (
 487   IN  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL  *This
 488   )
 489 ;
 490
 491 /**
 492   Gets the attributes that a PCI root bridge supports setting with
 493   SetAttributes(), and the attributes that a PCI root bridge is currently
 494   using.
 495
 496   The GetAttributes() function returns the mask of attributes that this PCI
 497   root bridge supports and the mask of attributes that the PCI root bridge is
 498   currently using.
 499
 500   @param This        A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
 501   @param Supported   A pointer to the mask of attributes that this PCI root
 502                      bridge supports setting with SetAttributes().
 503   @param Attributes  A pointer to the mask of attributes that this PCI root
 504                      bridge is currently using.
 505
 506   @retval  EFI_SUCCESS           If Supports is not NULL, then the attributes
 507                                  that the PCI root bridge supports is returned
 508                                  in Supports. If Attributes is not NULL, then
 509                                  the attributes that the PCI root bridge is
 510                                  currently using is returned in Attributes.
 511   @retval  EFI_INVALID_PARAMETER Both Supports and Attributes are NULL.
 512 **/
 513 EFI_STATUS
 514 EFIAPI
 515 RootBridgeIoGetAttributes (
 516   IN  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL  *This,
 517   OUT UINT64                           *Supported,
 518   OUT UINT64                           *Attributes
 519   )
 520 ;
 521
 522 /**
 523
 524   Sets the attributes for a resource range on a PCI root bridge.
 525
 526   @param This            -  Pointer to EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL instance.
 527   @param Attributes      -  The mask of attributes to set.
 528   @param ResourceBase    -  Pointer to the base address of the resource range
 529                             to be modified by the attributes specified by Attributes.
 530   @param ResourceLength  -  Pointer to the length of the resource range to be modified.
 531
 532   @retval EFI_SUCCESS            -  Success.
 533   @retval EFI_INVALID_PARAMETER  -  Invalid parameter found.
 534   @retval EFI_OUT_OF_RESOURCES   -  Not enough resources to set the attributes upon.
 535
 536 **/
 537 EFI_STATUS
 538 EFIAPI
 539 RootBridgeIoSetAttributes (
 540   IN     EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL  *This,
 541   IN     UINT64                           Attributes,
 542   IN OUT UINT64                           *ResourceBase,
 543   IN OUT UINT64                           *ResourceLength
 544   )
 545 ;
 546
 547 /**
 548
 549   Retrieves the current resource settings of this PCI root bridge
 550   in the form of a set of ACPI resource descriptor.
 551
 552   @param This       -  Pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL instance.
 553   @param Resources  -  Pointer to the resource descriptor that
 554                        describe the current configuration of this PCI root
 555                        bridge.
 556
 557   @retval EFI_SUCCESS      -  Success.
 558   @retval EFI_UNSUPPORTED  -  Current configuration of the PCI root bridge
 559                       @retval could not be retrieved.
 560
 561 **/
 562 EFI_STATUS
 563 EFIAPI
 564 RootBridgeIoConfiguration (
 565   IN  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL  *This,
 566   OUT VOID                             **Resources
 567   )
 568 ;
 569
 570 extern EFI_CPU_IO2_PROTOCOL         *mCpuIo;
 571 #endif