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audk/MdePkg/Include/Protocol/PciIo.h

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/** @file
EFI PCI I/O Protocol provides the basic Memory, I/O, PCI configuration,
and DMA interfaces that a driver uses to access its PCI controller.
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef __PCI_IO_H__
#define __PCI_IO_H__
///
/// Global ID for the PCI I/O Protocol
///
#define EFI_PCI_IO_PROTOCOL_GUID \
{ \
0x4cf5b200, 0x68b8, 0x4ca5, {0x9e, 0xec, 0xb2, 0x3e, 0x3f, 0x50, 0x2, 0x9a } \
}
typedef struct _EFI_PCI_IO_PROTOCOL EFI_PCI_IO_PROTOCOL;
///
/// *******************************************************
/// EFI_PCI_IO_PROTOCOL_WIDTH
/// *******************************************************
///
typedef enum {
EfiPciIoWidthUint8 = 0,
EfiPciIoWidthUint16,
EfiPciIoWidthUint32,
EfiPciIoWidthUint64,
EfiPciIoWidthFifoUint8,
EfiPciIoWidthFifoUint16,
EfiPciIoWidthFifoUint32,
EfiPciIoWidthFifoUint64,
EfiPciIoWidthFillUint8,
EfiPciIoWidthFillUint16,
EfiPciIoWidthFillUint32,
EfiPciIoWidthFillUint64,
EfiPciIoWidthMaximum
} EFI_PCI_IO_PROTOCOL_WIDTH;
//
// Complete PCI address generater
//
#define EFI_PCI_IO_PASS_THROUGH_BAR 0xff ///< Special BAR that passes a memory or I/O cycle through unchanged
#define EFI_PCI_IO_ATTRIBUTE_MASK 0x077f ///< All the following I/O and Memory cycles
#define EFI_PCI_IO_ATTRIBUTE_ISA_MOTHERBOARD_IO 0x0001 ///< I/O cycles 0x0000-0x00FF (10 bit decode)
#define EFI_PCI_IO_ATTRIBUTE_ISA_IO 0x0002 ///< I/O cycles 0x0100-0x03FF or greater (10 bit decode)
#define EFI_PCI_IO_ATTRIBUTE_VGA_PALETTE_IO 0x0004 ///< I/O cycles 0x3C6, 0x3C8, 0x3C9 (10 bit decode)
#define EFI_PCI_IO_ATTRIBUTE_VGA_MEMORY 0x0008 ///< MEM cycles 0xA0000-0xBFFFF (24 bit decode)
#define EFI_PCI_IO_ATTRIBUTE_VGA_IO 0x0010 ///< I/O cycles 0x3B0-0x3BB and 0x3C0-0x3DF (10 bit decode)
#define EFI_PCI_IO_ATTRIBUTE_IDE_PRIMARY_IO 0x0020 ///< I/O cycles 0x1F0-0x1F7, 0x3F6, 0x3F7 (10 bit decode)
#define EFI_PCI_IO_ATTRIBUTE_IDE_SECONDARY_IO 0x0040 ///< I/O cycles 0x170-0x177, 0x376, 0x377 (10 bit decode)
#define EFI_PCI_IO_ATTRIBUTE_MEMORY_WRITE_COMBINE 0x0080 ///< Map a memory range so writes are combined
#define EFI_PCI_IO_ATTRIBUTE_IO 0x0100 ///< Enable the I/O decode bit in the PCI Config Header
#define EFI_PCI_IO_ATTRIBUTE_MEMORY 0x0200 ///< Enable the Memory decode bit in the PCI Config Header
#define EFI_PCI_IO_ATTRIBUTE_BUS_MASTER 0x0400 ///< Enable the DMA bit in the PCI Config Header
#define EFI_PCI_IO_ATTRIBUTE_MEMORY_CACHED 0x0800 ///< Map a memory range so all r/w accesses are cached
#define EFI_PCI_IO_ATTRIBUTE_MEMORY_DISABLE 0x1000 ///< Disable a memory range
#define EFI_PCI_IO_ATTRIBUTE_EMBEDDED_DEVICE 0x2000 ///< Clear for an add-in PCI Device
#define EFI_PCI_IO_ATTRIBUTE_EMBEDDED_ROM 0x4000 ///< Clear for a physical PCI Option ROM accessed through ROM BAR
#define EFI_PCI_IO_ATTRIBUTE_DUAL_ADDRESS_CYCLE 0x8000 ///< Clear for PCI controllers that can not genrate a DAC
#define EFI_PCI_IO_ATTRIBUTE_ISA_IO_16 0x10000 ///< I/O cycles 0x0100-0x03FF or greater (16 bit decode)
#define EFI_PCI_IO_ATTRIBUTE_VGA_PALETTE_IO_16 0x20000 ///< I/O cycles 0x3C6, 0x3C8, 0x3C9 (16 bit decode)
#define EFI_PCI_IO_ATTRIBUTE_VGA_IO_16 0x40000 ///< I/O cycles 0x3B0-0x3BB and 0x3C0-0x3DF (16 bit decode)
#define EFI_PCI_DEVICE_ENABLE (EFI_PCI_IO_ATTRIBUTE_IO | EFI_PCI_IO_ATTRIBUTE_MEMORY | EFI_PCI_IO_ATTRIBUTE_BUS_MASTER)
#define EFI_VGA_DEVICE_ENABLE (EFI_PCI_IO_ATTRIBUTE_VGA_PALETTE_IO | EFI_PCI_IO_ATTRIBUTE_VGA_MEMORY | EFI_PCI_IO_ATTRIBUTE_VGA_IO | EFI_PCI_IO_ATTRIBUTE_IO)
///
/// *******************************************************
/// EFI_PCI_IO_PROTOCOL_OPERATION
/// *******************************************************
///
typedef enum {
///
/// A read operation from system memory by a bus master.
///
EfiPciIoOperationBusMasterRead,
///
/// A write operation from system memory by a bus master.
///
EfiPciIoOperationBusMasterWrite,
///
/// Provides both read and write access to system memory by both the processor and a
/// bus master. The buffer is coherent from both the processor's and the bus master's point of view.
///
EfiPciIoOperationBusMasterCommonBuffer,
EfiPciIoOperationMaximum
} EFI_PCI_IO_PROTOCOL_OPERATION;
///
/// *******************************************************
/// EFI_PCI_IO_PROTOCOL_ATTRIBUTE_OPERATION
/// *******************************************************
///
typedef enum {
///
/// Retrieve the PCI controller's current attributes, and return them in Result.
///
EfiPciIoAttributeOperationGet,
///
/// Set the PCI controller's current attributes to Attributes.
///
EfiPciIoAttributeOperationSet,
///
/// Enable the attributes specified by the bits that are set in Attributes for this PCI controller.
///
EfiPciIoAttributeOperationEnable,
///
/// Disable the attributes specified by the bits that are set in Attributes for this PCI controller.
///
EfiPciIoAttributeOperationDisable,
///
/// Retrieve the PCI controller's supported attributes, and return them in Result.
///
EfiPciIoAttributeOperationSupported,
EfiPciIoAttributeOperationMaximum
} EFI_PCI_IO_PROTOCOL_ATTRIBUTE_OPERATION;
/**
Reads from the memory space of a PCI controller. Returns either when the polling exit criteria is
satisfied or after a defined duration.
@param This A pointer to the EFI_PCI_IO_PROTOCOL instance.
@param Width Signifies the width of the memory or I/O operations.
@param BarIndex The BAR index of the standard PCI Configuration header to use as the
base address for the memory operation to perform.
@param Offset The offset within the selected BAR to start the memory operation.
@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_UNSUPPORTED BarIndex not valid for this PCI controller.
@retval EFI_UNSUPPORTED Offset is not valid for the BarIndex of this PCI controller.
@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_IO_PROTOCOL_POLL_IO_MEM)(
IN EFI_PCI_IO_PROTOCOL *This,
IN EFI_PCI_IO_PROTOCOL_WIDTH Width,
IN UINT8 BarIndex,
IN UINT64 Offset,
IN UINT64 Mask,
IN UINT64 Value,
IN UINT64 Delay,
OUT UINT64 *Result
);
/**
Enable a PCI driver to access PCI controller registers in the PCI memory or I/O space.
@param This A pointer to the EFI_PCI_IO_PROTOCOL instance.
@param Width Signifies the width of the memory or I/O operations.
@param BarIndex The BAR index of the standard PCI Configuration header to use as the
base address for the memory or I/O operation to perform.
@param Offset The offset within the selected BAR to start the memory or I/O operation.
@param Count The number of memory or I/O 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 controller.
@retval EFI_UNSUPPORTED BarIndex not valid for this PCI controller.
@retval EFI_UNSUPPORTED The address range specified by Offset, Width, and Count is not
valid for the PCI BAR specified by BarIndex.
@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_IO_PROTOCOL_IO_MEM)(
IN EFI_PCI_IO_PROTOCOL *This,
IN EFI_PCI_IO_PROTOCOL_WIDTH Width,
IN UINT8 BarIndex,
IN UINT64 Offset,
IN UINTN Count,
IN OUT VOID *Buffer
);
typedef struct {
///
/// Read PCI controller registers in the PCI memory or I/O space.
///
EFI_PCI_IO_PROTOCOL_IO_MEM Read;
///
/// Write PCI controller registers in the PCI memory or I/O space.
///
EFI_PCI_IO_PROTOCOL_IO_MEM Write;
} EFI_PCI_IO_PROTOCOL_ACCESS;
/**
Enable a PCI driver to access PCI controller registers in PCI configuration space.
@param This A pointer to the EFI_PCI_IO_PROTOCOL instance.
@param Width Signifies the width of the memory operations.
@param Offset The offset within the PCI configuration space for the PCI controller.
@param Count The number of PCI configuration 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 controller.
@retval EFI_UNSUPPORTED The address range specified by Offset, Width, and Count is not
valid for the PCI configuration header of the PCI controller.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
@retval EFI_INVALID_PARAMETER Buffer is NULL or Width is invalid.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PCI_IO_PROTOCOL_CONFIG)(
IN EFI_PCI_IO_PROTOCOL *This,
IN EFI_PCI_IO_PROTOCOL_WIDTH Width,
IN UINT32 Offset,
IN UINTN Count,
IN OUT VOID *Buffer
);
typedef struct {
///
/// Read PCI controller registers in PCI configuration space.
///
EFI_PCI_IO_PROTOCOL_CONFIG Read;
///
/// Write PCI controller registers in PCI configuration space.
///
EFI_PCI_IO_PROTOCOL_CONFIG Write;
} EFI_PCI_IO_PROTOCOL_CONFIG_ACCESS;
/**
Enables a PCI driver to copy one region of PCI memory space to another region of PCI
memory space.
@param This A pointer to the EFI_PCI_IO_PROTOCOL instance.
@param Width Signifies the width of the memory operations.
@param DestBarIndex The BAR index in the standard PCI Configuration header to use as the
base address for the memory operation to perform.
@param DestOffset The destination offset within the BAR specified by DestBarIndex to
start the memory writes for the copy operation.
@param SrcBarIndex The BAR index in the standard PCI Configuration header to use as the
base address for the memory operation to perform.
@param SrcOffset The source offset within the BAR specified by SrcBarIndex to start
the memory reads for the copy operation.
@param Count The number of memory operations to perform. Bytes moved is Width
size * Count, starting at DestOffset and SrcOffset.
@retval EFI_SUCCESS The data was copied from one memory region to another memory region.
@retval EFI_UNSUPPORTED DestBarIndex not valid for this PCI controller.
@retval EFI_UNSUPPORTED SrcBarIndex not valid for this PCI controller.
@retval EFI_UNSUPPORTED The address range specified by DestOffset, Width, and Count
is not valid for the PCI BAR specified by DestBarIndex.
@retval EFI_UNSUPPORTED The address range specified by SrcOffset, Width, and Count is
not valid for the PCI BAR specified by SrcBarIndex.
@retval EFI_INVALID_PARAMETER Width is invalid.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PCI_IO_PROTOCOL_COPY_MEM)(
IN EFI_PCI_IO_PROTOCOL *This,
IN EFI_PCI_IO_PROTOCOL_WIDTH Width,
IN UINT8 DestBarIndex,
IN UINT64 DestOffset,
IN UINT8 SrcBarIndex,
IN UINT64 SrcOffset,
IN UINTN Count
);
/**
Provides the PCI controller-specific addresses needed to access system memory.
@param This A pointer to the EFI_PCI_IO_PROTOCOL instance.
@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_IO_PROTOCOL_MAP)(
IN EFI_PCI_IO_PROTOCOL *This,
IN EFI_PCI_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_IO_PROTOCOL instance.
@param Mapping The mapping value returned from Map().
@retval EFI_SUCCESS The range was unmapped.
@retval EFI_DEVICE_ERROR The data was not committed to the target system memory.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PCI_IO_PROTOCOL_UNMAP)(
IN EFI_PCI_IO_PROTOCOL *This,
IN VOID *Mapping
);
/**
Allocates pages that are suitable for an EfiPciIoOperationBusMasterCommonBuffer
or EfiPciOperationBusMasterCommonBuffer64 mapping.
@param This A pointer to the EFI_PCI_IO_PROTOCOL instance.
@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, MEMORY_CACHED and DUAL_ADDRESS_CYCLE.
@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_IO_PROTOCOL_ALLOCATE_BUFFER)(
IN EFI_PCI_IO_PROTOCOL *This,
IN EFI_ALLOCATE_TYPE Type,
IN EFI_MEMORY_TYPE MemoryType,
IN UINTN Pages,
OUT VOID **HostAddress,
IN UINT64 Attributes
);
/**
Frees memory that was allocated with AllocateBuffer().
@param This A pointer to the EFI_PCI_IO_PROTOCOL instance.
@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_IO_PROTOCOL_FREE_BUFFER)(
IN EFI_PCI_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_IO_PROTOCOL instance.
@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_IO_PROTOCOL_FLUSH)(
IN EFI_PCI_IO_PROTOCOL *This
);
/**
Retrieves this PCI controller's current PCI bus number, device number, and function number.
@param This A pointer to the EFI_PCI_IO_PROTOCOL instance.
@param SegmentNumber The PCI controller's current PCI segment number.
@param BusNumber The PCI controller's current PCI bus number.
@param DeviceNumber The PCI controller's current PCI device number.
@param FunctionNumber The PCI controller's current PCI function number.
@retval EFI_SUCCESS The PCI controller location was returned.
@retval EFI_INVALID_PARAMETER One or more parameters are invalid.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PCI_IO_PROTOCOL_GET_LOCATION)(
IN EFI_PCI_IO_PROTOCOL *This,
OUT UINTN *SegmentNumber,
OUT UINTN *BusNumber,
OUT UINTN *DeviceNumber,
OUT UINTN *FunctionNumber
);
/**
Performs an operation on the attributes that this PCI controller supports. The operations include
getting the set of supported attributes, retrieving the current attributes, setting the current
attributes, enabling attributes, and disabling attributes.
@param This A pointer to the EFI_PCI_IO_PROTOCOL instance.
@param Operation The operation to perform on the attributes for this PCI controller.
@param Attributes The mask of attributes that are used for Set, Enable, and Disable
operations.
@param Result A pointer to the result mask of attributes that are returned for the Get
and Supported operations.
@retval EFI_SUCCESS The operation on the PCI controller's attributes was completed.
@retval EFI_INVALID_PARAMETER One or more parameters are invalid.
@retval EFI_UNSUPPORTED one or more of the bits set in
Attributes are not supported by this PCI controller or one of
its parent bridges when Operation is Set, Enable or Disable.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PCI_IO_PROTOCOL_ATTRIBUTES)(
IN EFI_PCI_IO_PROTOCOL *This,
IN EFI_PCI_IO_PROTOCOL_ATTRIBUTE_OPERATION Operation,
IN UINT64 Attributes,
OUT UINT64 *Result OPTIONAL
);
/**
Gets the attributes that this PCI controller supports setting on a BAR using
SetBarAttributes(), and retrieves the list of resource descriptors for a BAR.
@param This A pointer to the EFI_PCI_IO_PROTOCOL instance.
@param BarIndex The BAR index of the standard PCI Configuration header to use as the
base address for resource range. The legal range for this field is 0..5.
@param Supports A pointer to the mask of attributes that this PCI controller supports
setting for this BAR with SetBarAttributes().
@param Resources A pointer to the resource descriptors that describe the current
configuration of this BAR of the PCI controller.
@retval EFI_SUCCESS If Supports is not NULL, then the attributes that the PCI
controller supports are returned in Supports. If Resources
is not NULL, then the resource descriptors that the PCI
controller is currently using are returned in Resources.
@retval EFI_INVALID_PARAMETER Both Supports and Attributes are NULL.
@retval EFI_UNSUPPORTED BarIndex not valid for this PCI controller.
@retval EFI_OUT_OF_RESOURCES There are not enough resources available to allocate
Resources.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PCI_IO_PROTOCOL_GET_BAR_ATTRIBUTES)(
IN EFI_PCI_IO_PROTOCOL *This,
IN UINT8 BarIndex,
OUT UINT64 *Supports, OPTIONAL
OUT VOID **Resources OPTIONAL
);
/**
Sets the attributes for a range of a BAR on a PCI controller.
@param This A pointer to the EFI_PCI_IO_PROTOCOL instance.
@param Attributes The mask of attributes to set for the resource range specified by
BarIndex, Offset, and Length.
@param BarIndex The BAR index of the standard PCI Configuration header to use as the
base address for resource range. The legal range for this field is 0..5.
@param Offset A pointer to the BAR relative base address of the resource range to be
modified by the attributes specified by Attributes.
@param Length 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 BarIndex, Offset, and Length were
set on the PCI controller, and the actual resource range is returned
in Offset and Length.
@retval EFI_INVALID_PARAMETER Offset or Length is NULL.
@retval EFI_UNSUPPORTED BarIndex not valid for this PCI controller.
@retval EFI_OUT_OF_RESOURCES There are not enough resources to set the attributes on the
resource range specified by BarIndex, Offset, and
Length.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PCI_IO_PROTOCOL_SET_BAR_ATTRIBUTES)(
IN EFI_PCI_IO_PROTOCOL *This,
IN UINT64 Attributes,
IN UINT8 BarIndex,
IN OUT UINT64 *Offset,
IN OUT UINT64 *Length
);
///
/// The EFI_PCI_IO_PROTOCOL provides the basic Memory, I/O, PCI configuration,
/// and DMA interfaces used to abstract accesses to PCI controllers.
/// There is one EFI_PCI_IO_PROTOCOL instance for each PCI controller on a PCI bus.
/// A device driver that wishes to manage a PCI controller in a system will have to
/// retrieve the EFI_PCI_IO_PROTOCOL instance that is associated with the PCI controller.
///
struct _EFI_PCI_IO_PROTOCOL {
EFI_PCI_IO_PROTOCOL_POLL_IO_MEM PollMem;
EFI_PCI_IO_PROTOCOL_POLL_IO_MEM PollIo;
EFI_PCI_IO_PROTOCOL_ACCESS Mem;
EFI_PCI_IO_PROTOCOL_ACCESS Io;
EFI_PCI_IO_PROTOCOL_CONFIG_ACCESS Pci;
EFI_PCI_IO_PROTOCOL_COPY_MEM CopyMem;
EFI_PCI_IO_PROTOCOL_MAP Map;
EFI_PCI_IO_PROTOCOL_UNMAP Unmap;
EFI_PCI_IO_PROTOCOL_ALLOCATE_BUFFER AllocateBuffer;
EFI_PCI_IO_PROTOCOL_FREE_BUFFER FreeBuffer;
EFI_PCI_IO_PROTOCOL_FLUSH Flush;
EFI_PCI_IO_PROTOCOL_GET_LOCATION GetLocation;
EFI_PCI_IO_PROTOCOL_ATTRIBUTES Attributes;
EFI_PCI_IO_PROTOCOL_GET_BAR_ATTRIBUTES GetBarAttributes;
EFI_PCI_IO_PROTOCOL_SET_BAR_ATTRIBUTES SetBarAttributes;
///
/// The size, in bytes, of the ROM image.
///
UINT64 RomSize;
///
/// A pointer to the in memory copy of the ROM image. The PCI Bus Driver is responsible
/// for allocating memory for the ROM image, and copying the contents of the ROM to memory.
/// The contents of this buffer are either from the PCI option ROM that can be accessed
/// through the ROM BAR of the PCI controller, or it is from a platform-specific location.
/// The Attributes() function can be used to determine from which of these two sources
/// the RomImage buffer was initialized.
///
VOID *RomImage;
};
extern EFI_GUID gEfiPciIoProtocolGuid;
#endif
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