MdePkg/Include/Protocol/PciRootBridgeIo.h - device/linaro/bootloader/edk2 - Git at Google

 /** @file
   PCI Root Bridge I/O protocol as defined in the UEFI 2.0 specification.

   PCI Root Bridge I/O protocol is used by PCI Bus Driver to perform PCI Memory, PCI I/O,
   and PCI Configuration cycles on a PCI Root Bridge. It also provides services to perform
   defferent types of bus mastering DMA.

   Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
   which accompanies this distribution.  The full text of the license may be found at
   http://opensource.org/licenses/bsd-license.php

   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

 **/

 #ifndef __PCI_ROOT_BRIDGE_IO_H__
 #define __PCI_ROOT_BRIDGE_IO_H__

 #include <Library/BaseLib.h>

 #define EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_GUID \
   { \
     0x2f707ebb, 0x4a1a, 0x11d4, {0x9a, 0x38, 0x00, 0x90, 0x27, 0x3f, 0xc1, 0x4d } \
   }

 typedef struct _EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL;

 ///
 /// *******************************************************
 /// EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH
 /// *******************************************************
 ///
 typedef enum {
   EfiPciWidthUint8,
   EfiPciWidthUint16,
   EfiPciWidthUint32,
   EfiPciWidthUint64,
   EfiPciWidthFifoUint8,
   EfiPciWidthFifoUint16,
   EfiPciWidthFifoUint32,
   EfiPciWidthFifoUint64,
   EfiPciWidthFillUint8,
   EfiPciWidthFillUint16,
   EfiPciWidthFillUint32,
   EfiPciWidthFillUint64,
   EfiPciWidthMaximum
 } EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH;

 ///
 /// *******************************************************
 /// EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_OPERATION
 /// *******************************************************
 ///
 typedef enum {
   ///
   /// A read operation from system memory by a bus master that is not capable of producing
   /// PCI dual address cycles.
   ///
   EfiPciOperationBusMasterRead,
   ///
   /// A write operation from system memory by a bus master that is not capable of producing
   /// PCI dual address cycles.
   ///
   EfiPciOperationBusMasterWrite,
   ///
   /// Provides both read and write access to system memory by both the processor and a bus
   /// master that is not capable of producing PCI dual address cycles.
   ///
   EfiPciOperationBusMasterCommonBuffer,
   ///
   /// A read operation from system memory by a bus master that is capable of producing PCI
   /// dual address cycles.
   ///
   EfiPciOperationBusMasterRead64,
   ///
   /// A write operation to system memory by a bus master that is capable of producing PCI
   /// dual address cycles.
   ///
   EfiPciOperationBusMasterWrite64,
   ///
   /// Provides both read and write access to system memory by both the processor and a bus
   /// master that is capable of producing PCI dual address cycles.
   ///
   EfiPciOperationBusMasterCommonBuffer64,
   EfiPciOperationMaximum
 } EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_OPERATION;

 #define EFI_PCI_ATTRIBUTE_ISA_MOTHERBOARD_IO          0x0001
 #define EFI_PCI_ATTRIBUTE_ISA_IO                      0x0002
 #define EFI_PCI_ATTRIBUTE_VGA_PALETTE_IO              0x0004
 #define EFI_PCI_ATTRIBUTE_VGA_MEMORY                  0x0008
 #define EFI_PCI_ATTRIBUTE_VGA_IO                      0x0010
 #define EFI_PCI_ATTRIBUTE_IDE_PRIMARY_IO              0x0020
 #define EFI_PCI_ATTRIBUTE_IDE_SECONDARY_IO            0x0040
 #define EFI_PCI_ATTRIBUTE_MEMORY_WRITE_COMBINE        0x0080
 #define EFI_PCI_ATTRIBUTE_MEMORY_CACHED               0x0800
 #define EFI_PCI_ATTRIBUTE_MEMORY_DISABLE              0x1000
 #define EFI_PCI_ATTRIBUTE_DUAL_ADDRESS_CYCLE          0x8000
 #define EFI_PCI_ATTRIBUTE_ISA_IO_16                   0x10000
 #define EFI_PCI_ATTRIBUTE_VGA_PALETTE_IO_16           0x20000
 #define EFI_PCI_ATTRIBUTE_VGA_IO_16                   0x40000

 #define EFI_PCI_ATTRIBUTE_VALID_FOR_ALLOCATE_BUFFER   (EFI_PCI_ATTRIBUTE_MEMORY_WRITE_COMBINE | EFI_PCI_ATTRIBUTE_MEMORY_CACHED | EFI_PCI_ATTRIBUTE_DUAL_ADDRESS_CYCLE)

 #define EFI_PCI_ATTRIBUTE_INVALID_FOR_ALLOCATE_BUFFER (~EFI_PCI_ATTRIBUTE_VALID_FOR_ALLOCATE_BUFFER)

 #define EFI_PCI_ADDRESS(bus, dev, func, reg) \
   (UINT64) ( \
   (((UINTN) bus) << 24) | \
   (((UINTN) dev) << 16) | \
   (((UINTN) func) << 8) | \
   (((UINTN) (reg)) < 256 ? ((UINTN) (reg)) : (UINT64) (LShiftU64 ((UINT64) (reg), 32))))

 typedef struct {
   UINT8   Register;
   UINT8   Function;
   UINT8   Device;
   UINT8   Bus;
   UINT32  ExtendedRegister;
 } EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_PCI_ADDRESS;

 /**
   Reads from the I/O space of a PCI Root Bridge. Returns when either the polling exit criteria is
   satisfied or after a defined duration.

   @param  This                  A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
   @param  Width                 Signifies the width of the memory or I/O operations.
   @param  Address               The base address of the memory or I/O operations.
   @param  Mask                  Mask used for the polling criteria.
   @param  Value                 The comparison value used for the polling exit criteria.
   @param  Delay                 The number of 100 ns units to poll.
   @param  Result                Pointer to the last value read from the memory location.

   @retval EFI_SUCCESS           The last data returned from the access matched the poll exit criteria.
   @retval EFI_TIMEOUT           Delay expired before a match occurred.
   @retval EFI_OUT_OF_RESOURCES  The request could not be completed due to a lack of resources.
   @retval EFI_INVALID_PARAMETER One or more parameters are invalid.

 **/
 typedef
 EFI_STATUS
 (EFIAPI *EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_POLL_IO_MEM)(
   IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL           *This,
   IN  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH    Width,
   IN  UINT64                                   Address,
   IN  UINT64                                   Mask,
   IN  UINT64                                   Value,
   IN  UINT64                                   Delay,
   OUT UINT64                                   *Result
   );

 /**
   Enables a PCI driver to access PCI controller registers in the PCI root bridge memory space.

   @param  This                  A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
   @param  Width                 Signifies the width of the memory operations.
   @param  Address               The base address of the memory operations.
   @param  Count                 The number of memory operations to perform.
   @param  Buffer                For read operations, the destination buffer to store the results. For write
                                 operations, the source buffer to write data from.

   @retval EFI_SUCCESS           The data was read from or written to the PCI root bridge.
   @retval EFI_OUT_OF_RESOURCES  The request could not be completed due to a lack of resources.
   @retval EFI_INVALID_PARAMETER One or more parameters are invalid.

 **/
 typedef
 EFI_STATUS
 (EFIAPI *EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_IO_MEM)(
   IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL              *This,
   IN     EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH    Width,
   IN     UINT64                                   Address,
   IN     UINTN                                    Count,
   IN OUT VOID                                     *Buffer
   );

 typedef struct {
   ///
   /// Read PCI controller registers in the PCI root bridge memory space.
   ///
   EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_IO_MEM  Read;
   ///
   /// Write PCI controller registers in the PCI root bridge memory space.
   ///
   EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_IO_MEM  Write;
 } EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_ACCESS;

 /**
   Enables a PCI driver to copy one region of PCI root bridge memory space to another region of PCI
   root bridge memory space.

   @param  This                  A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL instance.
   @param  Width                 Signifies the width of the memory operations.
   @param  DestAddress           The destination address of the memory operation.
   @param  SrcAddress            The source address of the memory operation.
   @param  Count                 The number of memory operations to perform.

   @retval EFI_SUCCESS           The data was copied from one memory region to another memory region.
   @retval EFI_INVALID_PARAMETER Width is invalid for this PCI root bridge.
   @retval EFI_OUT_OF_RESOURCES  The request could not be completed due to a lack of resources.

 **/
 typedef
 EFI_STATUS
 (EFIAPI *EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_COPY_MEM)(
   IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL              *This,
   IN     EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH    Width,
   IN     UINT64                                   DestAddress,
   IN     UINT64                                   SrcAddress,
   IN     UINTN                                    Count
   );

 /**
   Provides the PCI controller-specific addresses required to access system memory from a
   DMA bus master.

   @param  This                  A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
   @param  Operation             Indicates if the bus master is going to read or write to system memory.
   @param  HostAddress           The system memory address to map to the PCI controller.
   @param  NumberOfBytes         On input the number of bytes to map. On output the number of bytes
                                 that were mapped.
   @param  DeviceAddress         The resulting map address for the bus master PCI controller to use to
                                 access the hosts HostAddress.
   @param  Mapping               A resulting value to pass to Unmap().

   @retval EFI_SUCCESS           The range was mapped for the returned NumberOfBytes.
   @retval EFI_UNSUPPORTED       The HostAddress cannot be mapped as a common buffer.
   @retval EFI_INVALID_PARAMETER One or more parameters are invalid.
   @retval EFI_OUT_OF_RESOURCES  The request could not be completed due to a lack of resources.
   @retval EFI_DEVICE_ERROR      The system hardware could not map the requested address.

 **/
 typedef
 EFI_STATUS
 (EFIAPI *EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_MAP)(
   IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL                *This,
   IN     EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_OPERATION  Operation,
   IN     VOID                                       *HostAddress,
   IN OUT UINTN                                      *NumberOfBytes,
   OUT    EFI_PHYSICAL_ADDRESS                       *DeviceAddress,
   OUT    VOID                                       **Mapping
   );

 /**
   Completes the Map() operation and releases any corresponding resources.

   @param  This                  A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
   @param  Mapping               The mapping value returned from Map().

   @retval EFI_SUCCESS           The range was unmapped.
   @retval EFI_INVALID_PARAMETER Mapping is not a value that was returned by Map().
   @retval EFI_DEVICE_ERROR      The data was not committed to the target system memory.

 **/
 typedef
 EFI_STATUS
 (EFIAPI *EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_UNMAP)(
   IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL           *This,
   IN  VOID                                     *Mapping
   );

 /**
   Allocates pages that are suitable for an EfiPciOperationBusMasterCommonBuffer or
   EfiPciOperationBusMasterCommonBuffer64 mapping.

   @param  This                  A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
   @param  Type                  This parameter is not used and must be ignored.
   @param  MemoryType            The type of memory to allocate, EfiBootServicesData or
                                 EfiRuntimeServicesData.
   @param  Pages                 The number of pages to allocate.
   @param  HostAddress           A pointer to store the base system memory address of the
                                 allocated range.
   @param  Attributes            The requested bit mask of attributes for the allocated range.

   @retval EFI_SUCCESS           The requested memory pages were allocated.
   @retval EFI_UNSUPPORTED       Attributes is unsupported. The only legal attribute bits are
                                 MEMORY_WRITE_COMBINE and MEMORY_CACHED.
   @retval EFI_INVALID_PARAMETER One or more parameters are invalid.
   @retval EFI_OUT_OF_RESOURCES  The memory pages could not be allocated.

 **/
 typedef
 EFI_STATUS
 (EFIAPI *EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_ALLOCATE_BUFFER)(
   IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL              *This,
   IN     EFI_ALLOCATE_TYPE                        Type,
   IN     EFI_MEMORY_TYPE                          MemoryType,
   IN     UINTN                                    Pages,
   IN OUT VOID                                     **HostAddress,
   IN     UINT64                                   Attributes
   );

 /**
   Frees memory that was allocated with AllocateBuffer().

   @param  This                  A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
   @param  Pages                 The number of pages to free.
   @param  HostAddress           The base system memory address of the allocated range.

   @retval EFI_SUCCESS           The requested memory pages were freed.
   @retval EFI_INVALID_PARAMETER The memory range specified by HostAddress and Pages
                                 was not allocated with AllocateBuffer().

 **/
 typedef
 EFI_STATUS
 (EFIAPI *EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_FREE_BUFFER)(
   IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL           *This,
   IN  UINTN                                    Pages,
   IN  VOID                                     *HostAddress
   );

 /**
   Flushes all PCI posted write transactions from a PCI host bridge to system memory.

   @param  This                  A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.

   @retval EFI_SUCCESS           The PCI posted write transactions were flushed from the PCI host
                                 bridge to system memory.
   @retval EFI_DEVICE_ERROR      The PCI posted write transactions were not flushed from the PCI
                                 host bridge due to a hardware error.

 **/
 typedef
 EFI_STATUS
 (EFIAPI *EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_FLUSH)(
   IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL  *This
   );

 /**
   Gets the attributes that a PCI root bridge supports setting with SetAttributes(), and the
   attributes that a PCI root bridge is currently using.

   @param  This                  A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
   @param  Supports              A pointer to the mask of attributes that this PCI root bridge supports
                                 setting with SetAttributes().
   @param  Attributes            A pointer to the mask of attributes that this PCI root bridge is currently
                                 using.

   @retval EFI_SUCCESS           If Supports is not NULL, then the attributes that the PCI root
                                 bridge supports is returned in Supports. If Attributes is
                                 not NULL, then the attributes that the PCI root bridge is currently
                                 using is returned in Attributes.
   @retval EFI_INVALID_PARAMETER Both Supports and Attributes are NULL.


 **/
 typedef
 EFI_STATUS
 (EFIAPI *EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_GET_ATTRIBUTES)(
   IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL           *This,
   OUT UINT64                                   *Supports,
   OUT UINT64                                   *Attributes
   );

 /**
   Sets attributes for a resource range on a PCI root bridge.

   @param  This                  A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
   @param  Attributes            The mask of attributes to set.
   @param  ResourceBase          A pointer to the base address of the resource range to be modified by the
                                 attributes specified by Attributes.
   @param  ResourceLength        A pointer to the length of the resource range to be modified by the
                                 attributes specified by Attributes.

   @retval EFI_SUCCESS           The set of attributes specified by Attributes for the resource
                                 range specified by ResourceBase and ResourceLength
                                 were set on the PCI root bridge, and the actual resource range is
                                 returned in ResuourceBase and ResourceLength.
   @retval EFI_UNSUPPORTED       A bit is set in Attributes that is not supported by the PCI Root
                                 Bridge.
   @retval EFI_OUT_OF_RESOURCES  There are not enough resources to set the attributes on the
                                 resource range specified by BaseAddress and Length.
   @retval EFI_INVALID_PARAMETER One or more parameters are invalid.

 **/
 typedef
 EFI_STATUS
 (EFIAPI *EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_SET_ATTRIBUTES)(
   IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL              *This,
   IN     UINT64                                   Attributes,
   IN OUT UINT64                                   *ResourceBase,
   IN OUT UINT64                                   *ResourceLength
   );

 /**
   Retrieves the current resource settings of this PCI root bridge in the form of a set of ACPI 2.0
   resource descriptors.

   @param  This                  A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
   @param  Resources             A pointer to the ACPI 2.0 resource descriptors that describe the current
                                 configuration of this PCI root bridge.

   @retval EFI_SUCCESS           The current configuration of this PCI root bridge was returned in
                                 Resources.
   @retval EFI_UNSUPPORTED       The current configuration of this PCI root bridge could not be
                                 retrieved.

 **/
 typedef
 EFI_STATUS
 (EFIAPI *EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_CONFIGURATION)(
   IN  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL          *This,
   OUT VOID                                     **Resources
   );

 ///
 /// Provides the basic Memory, I/O, PCI configuration, and DMA interfaces that are
 /// used to abstract accesses to PCI controllers behind a PCI Root Bridge Controller.
 ///
 struct _EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL {
   ///
   /// The EFI_HANDLE of the PCI Host Bridge of which this PCI Root Bridge is a member.
   ///
   EFI_HANDLE                                      ParentHandle;
   EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_POLL_IO_MEM     PollMem;
   EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_POLL_IO_MEM     PollIo;
   EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_ACCESS          Mem;
   EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_ACCESS          Io;
   EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_ACCESS          Pci;
   EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_COPY_MEM        CopyMem;
   EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_MAP             Map;
   EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_UNMAP           Unmap;
   EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_ALLOCATE_BUFFER AllocateBuffer;
   EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_FREE_BUFFER     FreeBuffer;
   EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_FLUSH           Flush;
   EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_GET_ATTRIBUTES  GetAttributes;
   EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_SET_ATTRIBUTES  SetAttributes;
   EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_CONFIGURATION   Configuration;

   ///
   /// The segment number that this PCI root bridge resides.
   ///
   UINT32                                          SegmentNumber;
 };

 extern EFI_GUID gEfiPciRootBridgeIoProtocolGuid;

 #endif
	/** @file
	PCI Root Bridge I/O protocol as defined in the UEFI 2.0 specification.

	PCI Root Bridge I/O protocol is used by PCI Bus Driver to perform PCI Memory, PCI I/O,
	and PCI Configuration cycles on a PCI Root Bridge. It also provides services to perform
	defferent types of bus mastering DMA.

	Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
	This program and the accompanying materials
	are licensed and made available under the terms and conditions of the BSD License
	which accompanies this distribution. The full text of the license may be found at
	http://opensource.org/licenses/bsd-license.php

	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

	**/

	#ifndef __PCI_ROOT_BRIDGE_IO_H__
	#define __PCI_ROOT_BRIDGE_IO_H__

	#include <Library/BaseLib.h>

	#define EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_GUID \
	{ \
	0x2f707ebb, 0x4a1a, 0x11d4, {0x9a, 0x38, 0x00, 0x90, 0x27, 0x3f, 0xc1, 0x4d } \
	}

	typedef struct _EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL;

	///
	/// *******************************************************
	/// EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH
	/// *******************************************************
	///
	typedef enum {
	EfiPciWidthUint8,
	EfiPciWidthUint16,
	EfiPciWidthUint32,
	EfiPciWidthUint64,
	EfiPciWidthFifoUint8,
	EfiPciWidthFifoUint16,
	EfiPciWidthFifoUint32,
	EfiPciWidthFifoUint64,
	EfiPciWidthFillUint8,
	EfiPciWidthFillUint16,
	EfiPciWidthFillUint32,
	EfiPciWidthFillUint64,
	EfiPciWidthMaximum
	} EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH;

	///
	/// *******************************************************
	/// EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_OPERATION
	/// *******************************************************
	///
	typedef enum {
	///
	/// A read operation from system memory by a bus master that is not capable of producing
	/// PCI dual address cycles.
	///
	EfiPciOperationBusMasterRead,
	///
	/// A write operation from system memory by a bus master that is not capable of producing
	/// PCI dual address cycles.
	///
	EfiPciOperationBusMasterWrite,
	///
	/// Provides both read and write access to system memory by both the processor and a bus
	/// master that is not capable of producing PCI dual address cycles.
	///
	EfiPciOperationBusMasterCommonBuffer,
	///
	/// A read operation from system memory by a bus master that is capable of producing PCI
	/// dual address cycles.
	///
	EfiPciOperationBusMasterRead64,
	///
	/// A write operation to system memory by a bus master that is capable of producing PCI
	/// dual address cycles.
	///
	EfiPciOperationBusMasterWrite64,
	///
	/// Provides both read and write access to system memory by both the processor and a bus
	/// master that is capable of producing PCI dual address cycles.
	///
	EfiPciOperationBusMasterCommonBuffer64,
	EfiPciOperationMaximum
	} EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_OPERATION;

	#define EFI_PCI_ATTRIBUTE_ISA_MOTHERBOARD_IO 0x0001
	#define EFI_PCI_ATTRIBUTE_ISA_IO 0x0002
	#define EFI_PCI_ATTRIBUTE_VGA_PALETTE_IO 0x0004
	#define EFI_PCI_ATTRIBUTE_VGA_MEMORY 0x0008
	#define EFI_PCI_ATTRIBUTE_VGA_IO 0x0010
	#define EFI_PCI_ATTRIBUTE_IDE_PRIMARY_IO 0x0020
	#define EFI_PCI_ATTRIBUTE_IDE_SECONDARY_IO 0x0040
	#define EFI_PCI_ATTRIBUTE_MEMORY_WRITE_COMBINE 0x0080
	#define EFI_PCI_ATTRIBUTE_MEMORY_CACHED 0x0800
	#define EFI_PCI_ATTRIBUTE_MEMORY_DISABLE 0x1000
	#define EFI_PCI_ATTRIBUTE_DUAL_ADDRESS_CYCLE 0x8000
	#define EFI_PCI_ATTRIBUTE_ISA_IO_16 0x10000
	#define EFI_PCI_ATTRIBUTE_VGA_PALETTE_IO_16 0x20000
	#define EFI_PCI_ATTRIBUTE_VGA_IO_16 0x40000

	#define EFI_PCI_ATTRIBUTE_VALID_FOR_ALLOCATE_BUFFER (EFI_PCI_ATTRIBUTE_MEMORY_WRITE_COMBINE \| EFI_PCI_ATTRIBUTE_MEMORY_CACHED \| EFI_PCI_ATTRIBUTE_DUAL_ADDRESS_CYCLE)

	#define EFI_PCI_ATTRIBUTE_INVALID_FOR_ALLOCATE_BUFFER (~EFI_PCI_ATTRIBUTE_VALID_FOR_ALLOCATE_BUFFER)

	#define EFI_PCI_ADDRESS(bus, dev, func, reg) \
	(UINT64) ( \
	(((UINTN) bus) << 24) \| \
	(((UINTN) dev) << 16) \| \
	(((UINTN) func) << 8) \| \
	(((UINTN) (reg)) < 256 ? ((UINTN) (reg)) : (UINT64) (LShiftU64 ((UINT64) (reg), 32))))

	typedef struct {
	UINT8 Register;
	UINT8 Function;
	UINT8 Device;
	UINT8 Bus;
	UINT32 ExtendedRegister;
	} EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_PCI_ADDRESS;

	/**
	Reads from the I/O space of a PCI Root Bridge. Returns when either the polling exit criteria is
	satisfied or after a defined duration.

	@param This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
	@param Width Signifies the width of the memory or I/O operations.
	@param Address The base address of the memory or I/O operations.
	@param Mask Mask used for the polling criteria.
	@param Value The comparison value used for the polling exit criteria.
	@param Delay The number of 100 ns units to poll.
	@param Result Pointer to the last value read from the memory location.

	@retval EFI_SUCCESS The last data returned from the access matched the poll exit criteria.
	@retval EFI_TIMEOUT Delay expired before a match occurred.
	@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
	@retval EFI_INVALID_PARAMETER One or more parameters are invalid.

	**/
	typedef
	EFI_STATUS
	(EFIAPI *EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_POLL_IO_MEM)(
	IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
	IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH Width,
	IN UINT64 Address,
	IN UINT64 Mask,
	IN UINT64 Value,
	IN UINT64 Delay,
	OUT UINT64 *Result
	);

	/**
	Enables a PCI driver to access PCI controller registers in the PCI root bridge memory space.

	@param This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
	@param Width Signifies the width of the memory operations.
	@param Address The base address of the memory operations.
	@param Count The number of memory operations to perform.
	@param Buffer For read operations, the destination buffer to store the results. For write
	operations, the source buffer to write data from.

	@retval EFI_SUCCESS The data was read from or written to the PCI root bridge.
	@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
	@retval EFI_INVALID_PARAMETER One or more parameters are invalid.

	**/
	typedef
	EFI_STATUS
	(EFIAPI *EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_IO_MEM)(
	IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
	IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH Width,
	IN UINT64 Address,
	IN UINTN Count,
	IN OUT VOID *Buffer
	);

	typedef struct {
	///
	/// Read PCI controller registers in the PCI root bridge memory space.
	///
	EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_IO_MEM Read;
	///
	/// Write PCI controller registers in the PCI root bridge memory space.
	///
	EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_IO_MEM Write;
	} EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_ACCESS;

	/**
	Enables a PCI driver to copy one region of PCI root bridge memory space to another region of PCI
	root bridge memory space.

	@param This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL instance.
	@param Width Signifies the width of the memory operations.
	@param DestAddress The destination address of the memory operation.
	@param SrcAddress The source address of the memory operation.
	@param Count The number of memory operations to perform.

	@retval EFI_SUCCESS The data was copied from one memory region to another memory region.
	@retval EFI_INVALID_PARAMETER Width is invalid for this PCI root bridge.
	@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.

	**/
	typedef
	EFI_STATUS
	(EFIAPI *EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_COPY_MEM)(
	IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
	IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH Width,
	IN UINT64 DestAddress,
	IN UINT64 SrcAddress,
	IN UINTN Count
	);

	/**
	Provides the PCI controller-specific addresses required to access system memory from a
	DMA bus master.

	@param This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
	@param Operation Indicates if the bus master is going to read or write to system memory.
	@param HostAddress The system memory address to map to the PCI controller.
	@param NumberOfBytes On input the number of bytes to map. On output the number of bytes
	that were mapped.
	@param DeviceAddress The resulting map address for the bus master PCI controller to use to
	access the hosts HostAddress.
	@param Mapping A resulting value to pass to Unmap().

	@retval EFI_SUCCESS The range was mapped for the returned NumberOfBytes.
	@retval EFI_UNSUPPORTED The HostAddress cannot be mapped as a common buffer.
	@retval EFI_INVALID_PARAMETER One or more parameters are invalid.
	@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
	@retval EFI_DEVICE_ERROR The system hardware could not map the requested address.

	**/
	typedef
	EFI_STATUS
	(EFIAPI *EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_MAP)(
	IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
	IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_OPERATION Operation,
	IN VOID *HostAddress,
	IN OUT UINTN *NumberOfBytes,
	OUT EFI_PHYSICAL_ADDRESS *DeviceAddress,
	OUT VOID **Mapping
	);

	/**
	Completes the Map() operation and releases any corresponding resources.

	@param This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
	@param Mapping The mapping value returned from Map().

	@retval EFI_SUCCESS The range was unmapped.
	@retval EFI_INVALID_PARAMETER Mapping is not a value that was returned by Map().
	@retval EFI_DEVICE_ERROR The data was not committed to the target system memory.

	**/
	typedef
	EFI_STATUS
	(EFIAPI *EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_UNMAP)(
	IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
	IN VOID *Mapping
	);

	/**
	Allocates pages that are suitable for an EfiPciOperationBusMasterCommonBuffer or
	EfiPciOperationBusMasterCommonBuffer64 mapping.

	@param This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
	@param Type This parameter is not used and must be ignored.
	@param MemoryType The type of memory to allocate, EfiBootServicesData or
	EfiRuntimeServicesData.
	@param Pages The number of pages to allocate.
	@param HostAddress A pointer to store the base system memory address of the
	allocated range.
	@param Attributes The requested bit mask of attributes for the allocated range.

	@retval EFI_SUCCESS The requested memory pages were allocated.
	@retval EFI_UNSUPPORTED Attributes is unsupported. The only legal attribute bits are
	MEMORY_WRITE_COMBINE and MEMORY_CACHED.
	@retval EFI_INVALID_PARAMETER One or more parameters are invalid.
	@retval EFI_OUT_OF_RESOURCES The memory pages could not be allocated.

	**/
	typedef
	EFI_STATUS
	(EFIAPI *EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_ALLOCATE_BUFFER)(
	IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
	IN EFI_ALLOCATE_TYPE Type,
	IN EFI_MEMORY_TYPE MemoryType,
	IN UINTN Pages,
	IN OUT VOID **HostAddress,
	IN UINT64 Attributes
	);

	/**
	Frees memory that was allocated with AllocateBuffer().

	@param This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
	@param Pages The number of pages to free.
	@param HostAddress The base system memory address of the allocated range.

	@retval EFI_SUCCESS The requested memory pages were freed.
	@retval EFI_INVALID_PARAMETER The memory range specified by HostAddress and Pages
	was not allocated with AllocateBuffer().

	**/
	typedef
	EFI_STATUS
	(EFIAPI *EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_FREE_BUFFER)(
	IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
	IN UINTN Pages,
	IN VOID *HostAddress
	);

	/**
	Flushes all PCI posted write transactions from a PCI host bridge to system memory.

	@param This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.

	@retval EFI_SUCCESS The PCI posted write transactions were flushed from the PCI host
	bridge to system memory.
	@retval EFI_DEVICE_ERROR The PCI posted write transactions were not flushed from the PCI
	host bridge due to a hardware error.

	**/
	typedef
	EFI_STATUS
	(EFIAPI *EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_FLUSH)(
	IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This
	);

	/**
	Gets the attributes that a PCI root bridge supports setting with SetAttributes(), and the
	attributes that a PCI root bridge is currently using.

	@param This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
	@param Supports A pointer to the mask of attributes that this PCI root bridge supports
	setting with SetAttributes().
	@param Attributes A pointer to the mask of attributes that this PCI root bridge is currently
	using.

	@retval EFI_SUCCESS If Supports is not NULL, then the attributes that the PCI root
	bridge supports is returned in Supports. If Attributes is
	not NULL, then the attributes that the PCI root bridge is currently
	using is returned in Attributes.
	@retval EFI_INVALID_PARAMETER Both Supports and Attributes are NULL.


	**/
	typedef
	EFI_STATUS
	(EFIAPI *EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_GET_ATTRIBUTES)(
	IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
	OUT UINT64 *Supports,
	OUT UINT64 *Attributes
	);

	/**
	Sets attributes for a resource range on a PCI root bridge.

	@param This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
	@param Attributes The mask of attributes to set.
	@param ResourceBase A pointer to the base address of the resource range to be modified by the
	attributes specified by Attributes.
	@param ResourceLength A pointer to the length of the resource range to be modified by the
	attributes specified by Attributes.

	@retval EFI_SUCCESS The set of attributes specified by Attributes for the resource
	range specified by ResourceBase and ResourceLength
	were set on the PCI root bridge, and the actual resource range is
	returned in ResuourceBase and ResourceLength.
	@retval EFI_UNSUPPORTED A bit is set in Attributes that is not supported by the PCI Root
	Bridge.
	@retval EFI_OUT_OF_RESOURCES There are not enough resources to set the attributes on the
	resource range specified by BaseAddress and Length.
	@retval EFI_INVALID_PARAMETER One or more parameters are invalid.

	**/
	typedef
	EFI_STATUS
	(EFIAPI *EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_SET_ATTRIBUTES)(
	IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
	IN UINT64 Attributes,
	IN OUT UINT64 *ResourceBase,
	IN OUT UINT64 *ResourceLength
	);

	/**
	Retrieves the current resource settings of this PCI root bridge in the form of a set of ACPI 2.0
	resource descriptors.

	@param This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
	@param Resources A pointer to the ACPI 2.0 resource descriptors that describe the current
	configuration of this PCI root bridge.

	@retval EFI_SUCCESS The current configuration of this PCI root bridge was returned in
	Resources.
	@retval EFI_UNSUPPORTED The current configuration of this PCI root bridge could not be
	retrieved.

	**/
	typedef
	EFI_STATUS
	(EFIAPI *EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_CONFIGURATION)(
	IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
	OUT VOID **Resources
	);

	///
	/// Provides the basic Memory, I/O, PCI configuration, and DMA interfaces that are
	/// used to abstract accesses to PCI controllers behind a PCI Root Bridge Controller.
	///
	struct _EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL {
	///
	/// The EFI_HANDLE of the PCI Host Bridge of which this PCI Root Bridge is a member.
	///
	EFI_HANDLE ParentHandle;
	EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_POLL_IO_MEM PollMem;
	EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_POLL_IO_MEM PollIo;
	EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_ACCESS Mem;
	EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_ACCESS Io;
	EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_ACCESS Pci;
	EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_COPY_MEM CopyMem;
	EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_MAP Map;
	EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_UNMAP Unmap;
	EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_ALLOCATE_BUFFER AllocateBuffer;
	EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_FREE_BUFFER FreeBuffer;
	EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_FLUSH Flush;
	EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_GET_ATTRIBUTES GetAttributes;
	EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_SET_ATTRIBUTES SetAttributes;
	EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_CONFIGURATION Configuration;

	///
	/// The segment number that this PCI root bridge resides.
	///
	UINT32 SegmentNumber;
	};

	extern EFI_GUID gEfiPciRootBridgeIoProtocolGuid;

	#endif