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audk/PcAtChipsetPkg/PciHostBridgeDxe/PciRootBridgeIo.c

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/** @file
PCI Root Bridge Io Protocol implementation
Copyright (c) 2008 - 2010, 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.
**/
#include "PciHostBridge.h"
typedef struct {
EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR SpaceDesp[TypeMax];
EFI_ACPI_END_TAG_DESCRIPTOR EndDesp;
} RESOURCE_CONFIGURATION;
RESOURCE_CONFIGURATION Configuration = {
{{0x8A, 0x2B, 1, 0, 0, 0, 0, 0, 0, 0},
{0x8A, 0x2B, 0, 0, 0, 32, 0, 0, 0, 0},
{0x8A, 0x2B, 0, 0, 6, 32, 0, 0, 0, 0},
{0x8A, 0x2B, 0, 0, 0, 64, 0, 0, 0, 0},
{0x8A, 0x2B, 0, 0, 6, 64, 0, 0, 0, 0},
{0x8A, 0x2B, 2, 0, 0, 0, 0, 0, 0, 0}},
{0x79, 0}
};
//
// Protocol Member Function Prototypes
//
/**
Polls an address in memory mapped I/O space until an exit condition is met, or
a timeout occurs.
This function provides a standard way to poll a PCI memory location. A PCI memory read
operation is performed at the PCI memory address specified by Address for the width specified
by Width. The result of this PCI memory read operation is stored in Result. This PCI memory
read operation is repeated until either a timeout of Delay 100 ns units has expired, or (Result &
Mask) is equal to Value.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Width Signifies the width of the memory operations.
@param[in] Address The base address of the memory operations. The caller is
responsible for aligning Address if required.
@param[in] Mask Mask used for the polling criteria. Bytes above Width in Mask
are ignored. The bits in the bytes below Width which are zero in
Mask are ignored when polling the memory address.
@param[in] Value The comparison value used for the polling exit criteria.
@param[in] Delay The number of 100 ns units to poll. Note that timer available may
be of poorer granularity.
@param[out] 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_INVALID_PARAMETER Width is invalid.
@retval EFI_INVALID_PARAMETER Result is NULL.
@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.
**/
EFI_STATUS
EFIAPI
RootBridgeIoPollMem (
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
);
/**
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.
This function provides a standard way to poll a PCI I/O location. A PCI I/O read operation is
performed at the PCI I/O address specified by Address for the width specified by Width.
The result of this PCI I/O read operation is stored in Result. This PCI I/O read operation is
repeated until either a timeout of Delay 100 ns units has expired, or (Result & Mask) is equal
to Value.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Width Signifies the width of the I/O operations.
@param[in] Address The base address of the I/O operations. The caller is responsible
for aligning Address if required.
@param[in] Mask Mask used for the polling criteria. Bytes above Width in Mask
are ignored. The bits in the bytes below Width which are zero in
Mask are ignored when polling the I/O address.
@param[in] Value The comparison value used for the polling exit criteria.
@param[in] Delay The number of 100 ns units to poll. Note that timer available may
be of poorer granularity.
@param[out] 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_INVALID_PARAMETER Width is invalid.
@retval EFI_INVALID_PARAMETER Result is NULL.
@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.
**/
EFI_STATUS
EFIAPI
RootBridgeIoPollIo (
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.
The Mem.Read(), and Mem.Write() functions enable a driver to access PCI controller
registers in the PCI root bridge memory space.
The memory operations are carried out exactly as requested. The caller is responsible for satisfying
any alignment and memory width restrictions that a PCI Root Bridge on a platform might require.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Width Signifies the width of the memory operation.
@param[in] Address The base address of the memory operation. The caller is
responsible for aligning the Address if required.
@param[in] Count The number of memory operations to perform. Bytes moved is
Width size * Count, starting at Address.
@param[out] 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_INVALID_PARAMETER Width is invalid for this PCI root bridge.
@retval EFI_INVALID_PARAMETER Buffer is NULL.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
**/
EFI_STATUS
EFIAPI
RootBridgeIoMemRead (
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
);
/**
Enables a PCI driver to access PCI controller registers in the PCI root bridge memory space.
The Mem.Read(), and Mem.Write() functions enable a driver to access PCI controller
registers in the PCI root bridge memory space.
The memory operations are carried out exactly as requested. The caller is responsible for satisfying
any alignment and memory width restrictions that a PCI Root Bridge on a platform might require.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Width Signifies the width of the memory operation.
@param[in] Address The base address of the memory operation. The caller is
responsible for aligning the Address if required.
@param[in] Count The number of memory operations to perform. Bytes moved is
Width size * Count, starting at Address.
@param[out] 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_INVALID_PARAMETER Width is invalid for this PCI root bridge.
@retval EFI_INVALID_PARAMETER Buffer is NULL.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
**/
EFI_STATUS
EFIAPI
RootBridgeIoMemWrite (
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
);
/**
Enables a PCI driver to access PCI controller registers in the PCI root bridge I/O space.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Width Signifies the width of the memory operations.
@param[in] Address The base address of the I/O operation. The caller is responsible for
aligning the Address if required.
@param[in] Count The number of I/O operations to perform. Bytes moved is Width
size * Count, starting at Address.
@param[out] 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_INVALID_PARAMETER Width is invalid for this PCI root bridge.
@retval EFI_INVALID_PARAMETER Buffer is NULL.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
**/
EFI_STATUS
EFIAPI
RootBridgeIoIoRead (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH Width,
IN UINT64 UserAddress,
IN UINTN Count,
IN OUT VOID *UserBuffer
);
/**
Enables a PCI driver to access PCI controller registers in the PCI root bridge I/O space.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Width Signifies the width of the memory operations.
@param[in] Address The base address of the I/O operation. The caller is responsible for
aligning the Address if required.
@param[in] Count The number of I/O operations to perform. Bytes moved is Width
size * Count, starting at Address.
@param[out] 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_INVALID_PARAMETER Width is invalid for this PCI root bridge.
@retval EFI_INVALID_PARAMETER Buffer is NULL.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
**/
EFI_STATUS
EFIAPI
RootBridgeIoIoWrite (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH Width,
IN UINT64 UserAddress,
IN UINTN Count,
IN OUT VOID *UserBuffer
);
/**
Enables a PCI driver to copy one region of PCI root bridge memory space to another region of PCI
root bridge memory space.
The CopyMem() function enables a PCI driver to copy one region of PCI root bridge memory
space to another region of PCI root bridge memory space. This is especially useful for video scroll
operation on a memory mapped video buffer.
The memory operations are carried out exactly as requested. The caller is responsible for satisfying
any alignment and memory width restrictions that a PCI root bridge on a platform might require.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL instance.
@param[in] Width Signifies the width of the memory operations.
@param[in] DestAddress The destination address of the memory operation. The caller is
responsible for aligning the DestAddress if required.
@param[in] SrcAddress The source address of the memory operation. The caller is
responsible for aligning the SrcAddress if required.
@param[in] Count The number of memory operations to perform. Bytes moved is
Width size * Count, starting at DestAddress and SrcAddress.
@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.
**/
EFI_STATUS
EFIAPI
RootBridgeIoCopyMem (
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
);
/**
Enables a PCI driver to access PCI controller registers in a PCI root bridge's configuration space.
The Pci.Read() and Pci.Write() functions enable a driver to access PCI configuration
registers for a PCI controller.
The PCI Configuration operations are carried out exactly as requested. The caller is responsible for
any alignment and PCI configuration width issues that a PCI Root Bridge on a platform might
require.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Width Signifies the width of the memory operations.
@param[in] Address The address within the PCI configuration space for the PCI controller.
@param[in] Count The number of PCI configuration operations to perform. Bytes
moved is Width size * Count, starting at Address.
@param[out] 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_INVALID_PARAMETER Width is invalid for this PCI root bridge.
@retval EFI_INVALID_PARAMETER Buffer is NULL.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
**/
EFI_STATUS
EFIAPI
RootBridgeIoPciRead (
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
);
/**
Enables a PCI driver to access PCI controller registers in a PCI root bridge's configuration space.
The Pci.Read() and Pci.Write() functions enable a driver to access PCI configuration
registers for a PCI controller.
The PCI Configuration operations are carried out exactly as requested. The caller is responsible for
any alignment and PCI configuration width issues that a PCI Root Bridge on a platform might
require.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Width Signifies the width of the memory operations.
@param[in] Address The address within the PCI configuration space for the PCI controller.
@param[in] Count The number of PCI configuration operations to perform. Bytes
moved is Width size * Count, starting at Address.
@param[out] 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_INVALID_PARAMETER Width is invalid for this PCI root bridge.
@retval EFI_INVALID_PARAMETER Buffer is NULL.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
**/
EFI_STATUS
EFIAPI
RootBridgeIoPciWrite (
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
);
/**
Provides the PCI controller-specific addresses required to access system memory from a
DMA bus master.
The Map() function provides the PCI controller specific addresses needed to access system
memory. This function is used to map system memory for PCI bus master DMA accesses.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Operation Indicates if the bus master is going to read or write to system memory.
@param[in] HostAddress The system memory address to map to the PCI controller.
@param[in][out] NumberOfBytes On input the number of bytes to map. On output the number of bytes that were mapped.
@param[out] DeviceAddress The resulting map address for the bus master PCI controller to use
to access the system memory's HostAddress.
@param[out] Mapping The value to pass to Unmap() when the bus master DMA operation is complete.
@retval EFI_SUCCESS The range was mapped for the returned NumberOfBytes.
@retval EFI_INVALID_PARAMETER Operation is invalid.
@retval EFI_INVALID_PARAMETER HostAddress is NULL.
@retval EFI_INVALID_PARAMETER NumberOfBytes is NULL.
@retval EFI_INVALID_PARAMETER DeviceAddress is NULL.
@retval EFI_INVALID_PARAMETER Mapping is NULL.
@retval EFI_UNSUPPORTED The HostAddress cannot be mapped as a common buffer.
@retval EFI_DEVICE_ERROR The system hardware could not map the requested address.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
**/
EFI_STATUS
EFIAPI
RootBridgeIoMap (
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.
The Unmap() function completes the Map() operation and releases any corresponding resources.
If the operation was an EfiPciOperationBusMasterWrite or
EfiPciOperationBusMasterWrite64, the data is committed to the target system memory.
Any resources used for the mapping are freed.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] 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.
**/
EFI_STATUS
EFIAPI
RootBridgeIoUnmap (
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. Only
the attributes EFI_PCI_ATTRIBUTE_MEMORY_WRITE_COMBINE, EFI_PCI_ATTRIBUTE_MEMORY_CACHED,
and EFI_PCI_ATTRIBUTE_DUAL_ADDRESS_CYCLE may be used with this function.
@retval EFI_SUCCESS The requested memory pages were allocated.
@retval EFI_INVALID_PARAMETER MemoryType is invalid.
@retval EFI_INVALID_PARAMETER HostAddress is NULL.
@retval EFI_UNSUPPORTED Attributes is unsupported. The only legal attribute bits are
MEMORY_WRITE_COMBINE, MEMORY_CACHED, and DUAL_ADDRESS_CYCLE.
@retval EFI_OUT_OF_RESOURCES The memory pages could not be allocated.
**/
EFI_STATUS
EFIAPI
RootBridgeIoAllocateBuffer (
IN EFI_PCI_ROOT_BRIDGE_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().
The FreeBuffer() function 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().
**/
EFI_STATUS
EFIAPI
RootBridgeIoFreeBuffer (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
IN UINTN Pages,
OUT VOID *HostAddress
);
/**
Flushes all PCI posted write transactions from a PCI host bridge to system memory.
The Flush() function flushes any PCI posted write transactions from a PCI host bridge to system
memory. Posted write transactions are generated by PCI bus masters when they perform write
transactions to target addresses in system memory.
This function does not flush posted write transactions from any PCI bridges. A PCI controller
specific action must be taken to guarantee that the posted write transactions have been flushed from
the PCI controller and from all the PCI bridges into the PCI host bridge. This is typically done with
a PCI read transaction from the PCI controller prior to calling Flush().
@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.
**/
EFI_STATUS
EFIAPI
RootBridgeIoFlush (
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.
The GetAttributes() function returns the mask of attributes that this PCI root bridge supports
and the mask of attributes that the PCI root bridge is currently using.
@param This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param Supported 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.
**/
EFI_STATUS
EFIAPI
RootBridgeIoGetAttributes (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
OUT UINT64 *Supported,
OUT UINT64 *Attributes
);
/**
Sets attributes for a resource range on a PCI root bridge.
The SetAttributes() function sets the attributes specified in Attributes for the PCI root
bridge on the resource range specified by ResourceBase and ResourceLength. Since the
granularity of setting these attributes may vary from resource type to resource type, and from
platform to platform, the actual resource range and the one passed in by the caller may differ. As a
result, this function may set the attributes specified by Attributes on a larger resource range
than the caller requested. The actual range is returned in ResourceBase and
ResourceLength. The caller is responsible for verifying that the actual range for which the
attributes were set is acceptable.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Attributes The mask of attributes to set. If the attribute bit
MEMORY_WRITE_COMBINE, MEMORY_CACHED, or
MEMORY_DISABLE is set, then the resource range is specified by
ResourceBase and ResourceLength. If
MEMORY_WRITE_COMBINE, MEMORY_CACHED, and
MEMORY_DISABLE are not set, then ResourceBase and
ResourceLength are ignored, and may be NULL.
@param[in][out] ResourceBase A pointer to the base address of the resource range to be modified
by the attributes specified by Attributes.
@param[in][out] ResourceLength A pointer to the length of the resource range to be modified by the
attributes specified by Attributes.
@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.
@retval EFI_INVALID_PARAMETER Invalid pointer of EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL
**/
EFI_STATUS
EFIAPI
RootBridgeIoSetAttributes (
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.
There are only two resource descriptor types from the ACPI Specification that may be used to
describe the current resources allocated to a PCI root bridge. These are the QWORD Address
Space Descriptor (ACPI 2.0 Section 6.4.3.5.1), and the End Tag (ACPI 2.0 Section 6.4.2.8). The
QWORD Address Space Descriptor can describe memory, I/O, and bus number ranges for dynamic
or fixed resources. The configuration of a PCI root bridge is described with one or more QWORD
Address Space Descriptors followed by an End Tag.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[out] Resources A pointer to the ACPI 2.0 resource descriptors that describe the
current configuration of this PCI root bridge. The storage for the
ACPI 2.0 resource descriptors is allocated by this function. The
caller must treat the return buffer as read-only data, and the buffer
must not be freed by the caller.
@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.
@retval EFI_INVALID_PARAMETER Invalid pointer of EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL
**/
EFI_STATUS
EFIAPI
RootBridgeIoConfiguration (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
OUT VOID **Resources
);
//
// Sub Function Prototypes
//
/**
Internal help function for read and write PCI configuration space.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Write Switch value for Read or Write.
@param[in] Width Signifies the width of the memory operations.
@param[in] UserAddress The address within the PCI configuration space for the PCI controller.
@param[in] Count The number of PCI configuration operations to perform. Bytes
moved is Width size * Count, starting at Address.
@param[out] UserBuffer 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_INVALID_PARAMETER Width is invalid for this PCI root bridge.
@retval EFI_INVALID_PARAMETER Buffer is NULL.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
**/
EFI_STATUS
RootBridgeIoPciRW (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
IN BOOLEAN Write,
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH Width,
IN UINT64 UserAddress,
IN UINTN Count,
IN OUT VOID *UserBuffer
);
//
// Memory Controller Pci Root Bridge Io Module Variables
//
EFI_METRONOME_ARCH_PROTOCOL *mMetronome;
EFI_CPU_IO2_PROTOCOL *mCpuIo;
/**
Construct the Pci Root Bridge Io protocol
@param Protocol Point to protocol instance
@param HostBridgeHandle Handle of host bridge
@param Attri Attribute of host bridge
@param ResAppeture ResourceAppeture for host bridge
@retval EFI_SUCCESS Success to initialize the Pci Root Bridge.
**/
EFI_STATUS
RootBridgeConstructor (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *Protocol,
IN EFI_HANDLE HostBridgeHandle,
IN UINT64 Attri,
IN PCI_ROOT_BRIDGE_RESOURCE_APPETURE *ResAppeture
)
{
EFI_STATUS Status;
PCI_ROOT_BRIDGE_INSTANCE *PrivateData;
PCI_RESOURCE_TYPE Index;
PrivateData = DRIVER_INSTANCE_FROM_PCI_ROOT_BRIDGE_IO_THIS (Protocol);
//
// The host to pci bridge, the host memory and io addresses are
// direct mapped to pci addresses, so no need translate, set bases to 0.
//
PrivateData->MemBase = ResAppeture->MemBase;
PrivateData->IoBase = ResAppeture->IoBase;
//
// The host bridge only supports 32bit addressing for memory
// and standard IA32 16bit io
//
PrivateData->MemLimit = ResAppeture->MemLimit;
PrivateData->IoLimit = ResAppeture->IoLimit;
//
// Bus Appeture for this Root Bridge (Possible Range)
//
PrivateData->BusBase = ResAppeture->BusBase;
PrivateData->BusLimit = ResAppeture->BusLimit;
//
// Specific for this chipset
//
for (Index = TypeIo; Index < TypeMax; Index++) {
PrivateData->ResAllocNode[Index].Type = Index;
PrivateData->ResAllocNode[Index].Base = 0;
PrivateData->ResAllocNode[Index].Length = 0;
PrivateData->ResAllocNode[Index].Status = ResNone;
}
EfiInitializeLock (&PrivateData->PciLock, TPL_HIGH_LEVEL);
PrivateData->PciAddress = 0xCF8;
PrivateData->PciData = 0xCFC;
PrivateData->RootBridgeAttrib = Attri;
PrivateData->Attributes = 0;
PrivateData->Supports = 0;
Protocol->ParentHandle = HostBridgeHandle;
Protocol->PollMem = RootBridgeIoPollMem;
Protocol->PollIo = RootBridgeIoPollIo;
Protocol->Mem.Read = RootBridgeIoMemRead;
Protocol->Mem.Write = RootBridgeIoMemWrite;
Protocol->Io.Read = RootBridgeIoIoRead;
Protocol->Io.Write = RootBridgeIoIoWrite;
Protocol->CopyMem = RootBridgeIoCopyMem;
Protocol->Pci.Read = RootBridgeIoPciRead;
Protocol->Pci.Write = RootBridgeIoPciWrite;
Protocol->Map = RootBridgeIoMap;
Protocol->Unmap = RootBridgeIoUnmap;
Protocol->AllocateBuffer = RootBridgeIoAllocateBuffer;
Protocol->FreeBuffer = RootBridgeIoFreeBuffer;
Protocol->Flush = RootBridgeIoFlush;
Protocol->GetAttributes = RootBridgeIoGetAttributes;
Protocol->SetAttributes = RootBridgeIoSetAttributes;
Protocol->Configuration = RootBridgeIoConfiguration;
Protocol->SegmentNumber = 0;
Status = gBS->LocateProtocol (&gEfiCpuIo2ProtocolGuid, NULL, (VOID **)&mCpuIo);
ASSERT_EFI_ERROR (Status);
Status = gBS->LocateProtocol (&gEfiMetronomeArchProtocolGuid, NULL, (VOID **)&mMetronome);
ASSERT_EFI_ERROR (Status);
return EFI_SUCCESS;
}
/**
Polls an address in memory mapped I/O space until an exit condition is met, or
a timeout occurs.
This function provides a standard way to poll a PCI memory location. A PCI memory read
operation is performed at the PCI memory address specified by Address for the width specified
by Width. The result of this PCI memory read operation is stored in Result. This PCI memory
read operation is repeated until either a timeout of Delay 100 ns units has expired, or (Result &
Mask) is equal to Value.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Width Signifies the width of the memory operations.
@param[in] Address The base address of the memory operations. The caller is
responsible for aligning Address if required.
@param[in] Mask Mask used for the polling criteria. Bytes above Width in Mask
are ignored. The bits in the bytes below Width which are zero in
Mask are ignored when polling the memory address.
@param[in] Value The comparison value used for the polling exit criteria.
@param[in] Delay The number of 100 ns units to poll. Note that timer available may
be of poorer granularity.
@param[out] 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_INVALID_PARAMETER Width is invalid.
@retval EFI_INVALID_PARAMETER Result is NULL.
@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.
**/
EFI_STATUS
EFIAPI
RootBridgeIoPollMem (
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
)
{
EFI_STATUS Status;
UINT64 NumberOfTicks;
UINT32 Remainder;
if (Result == NULL) {
return EFI_INVALID_PARAMETER;
}
if (Width < 0 || Width > EfiPciWidthUint64) {
return EFI_INVALID_PARAMETER;
}
//
// No matter what, always do a single poll.
//
Status = This->Mem.Read (This, Width, Address, 1, Result);
if (EFI_ERROR (Status)) {
return Status;
}
if ((*Result & Mask) == Value) {
return EFI_SUCCESS;
}
if (Delay == 0) {
return EFI_SUCCESS;
} else {
//
// Determine the proper # of metronome ticks to wait for polling the
// location. The nuber of ticks is Roundup (Delay / mMetronome->TickPeriod)+1
// The "+1" to account for the possibility of the first tick being short
// because we started in the middle of a tick.
//
// BugBug: overriding mMetronome->TickPeriod with UINT32 until Metronome
// protocol definition is updated.
//
NumberOfTicks = DivU64x32Remainder (Delay, (UINT32) mMetronome->TickPeriod, &Remainder);
if (Remainder != 0) {
NumberOfTicks += 1;
}
NumberOfTicks += 1;
while (NumberOfTicks) {
mMetronome->WaitForTick (mMetronome, 1);
Status = This->Mem.Read (This, Width, Address, 1, Result);
if (EFI_ERROR (Status)) {
return Status;
}
if ((*Result & Mask) == Value) {
return EFI_SUCCESS;
}
NumberOfTicks -= 1;
}
}
return EFI_TIMEOUT;
}
/**
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.
This function provides a standard way to poll a PCI I/O location. A PCI I/O read operation is
performed at the PCI I/O address specified by Address for the width specified by Width.
The result of this PCI I/O read operation is stored in Result. This PCI I/O read operation is
repeated until either a timeout of Delay 100 ns units has expired, or (Result & Mask) is equal
to Value.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Width Signifies the width of the I/O operations.
@param[in] Address The base address of the I/O operations. The caller is responsible
for aligning Address if required.
@param[in] Mask Mask used for the polling criteria. Bytes above Width in Mask
are ignored. The bits in the bytes below Width which are zero in
Mask are ignored when polling the I/O address.
@param[in] Value The comparison value used for the polling exit criteria.
@param[in] Delay The number of 100 ns units to poll. Note that timer available may
be of poorer granularity.
@param[out] 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_INVALID_PARAMETER Width is invalid.
@retval EFI_INVALID_PARAMETER Result is NULL.
@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.
**/
EFI_STATUS
EFIAPI
RootBridgeIoPollIo (
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
)
{
EFI_STATUS Status;
UINT64 NumberOfTicks;
UINT32 Remainder;
//
// No matter what, always do a single poll.
//
if (Result == NULL) {
return EFI_INVALID_PARAMETER;
}
if (Width < 0 || Width > EfiPciWidthUint64) {
return EFI_INVALID_PARAMETER;
}
Status = This->Io.Read (This, Width, Address, 1, Result);
if (EFI_ERROR (Status)) {
return Status;
}
if ((*Result & Mask) == Value) {
return EFI_SUCCESS;
}
if (Delay == 0) {
return EFI_SUCCESS;
} else {
//
// Determine the proper # of metronome ticks to wait for polling the
// location. The number of ticks is Roundup (Delay / mMetronome->TickPeriod)+1
// The "+1" to account for the possibility of the first tick being short
// because we started in the middle of a tick.
//
NumberOfTicks = DivU64x32Remainder (Delay, (UINT32)mMetronome->TickPeriod, &Remainder);
if (Remainder != 0) {
NumberOfTicks += 1;
}
NumberOfTicks += 1;
while (NumberOfTicks) {
mMetronome->WaitForTick (mMetronome, 1);
Status = This->Io.Read (This, Width, Address, 1, Result);
if (EFI_ERROR (Status)) {
return Status;
}
if ((*Result & Mask) == Value) {
return EFI_SUCCESS;
}
NumberOfTicks -= 1;
}
}
return EFI_TIMEOUT;
}
/**
Enables a PCI driver to access PCI controller registers in the PCI root bridge memory space.
The Mem.Read(), and Mem.Write() functions enable a driver to access PCI controller
registers in the PCI root bridge memory space.
The memory operations are carried out exactly as requested. The caller is responsible for satisfying
any alignment and memory width restrictions that a PCI Root Bridge on a platform might require.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Width Signifies the width of the memory operation.
@param[in] Address The base address of the memory operation. The caller is
responsible for aligning the Address if required.
@param[in] Count The number of memory operations to perform. Bytes moved is
Width size * Count, starting at Address.
@param[out] 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_INVALID_PARAMETER Width is invalid for this PCI root bridge.
@retval EFI_INVALID_PARAMETER Buffer is NULL.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
**/
EFI_STATUS
EFIAPI
RootBridgeIoMemRead (
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
)
{
PCI_ROOT_BRIDGE_INSTANCE *PrivateData;
EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH OldWidth;
UINTN OldCount;
if (Buffer == NULL) {
return EFI_INVALID_PARAMETER;
}
if (Width < 0 || Width >= EfiPciWidthMaximum) {
return EFI_INVALID_PARAMETER;
}
PrivateData = DRIVER_INSTANCE_FROM_PCI_ROOT_BRIDGE_IO_THIS(This);
//
// Check memory access limit
//
if (Address < PrivateData->MemBase) {
return EFI_INVALID_PARAMETER;
}
OldWidth = Width;
OldCount = Count;
if (Width >= EfiPciWidthFifoUint8 && Width <= EfiPciWidthFifoUint64) {
Count = 1;
}
Width = (EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH)(Width & 0x03);
if (Address + (((UINTN)1 << Width) * Count) - 1 > PrivateData->MemLimit) {
return EFI_INVALID_PARAMETER;
}
return mCpuIo->Mem.Read (mCpuIo, (EFI_CPU_IO_PROTOCOL_WIDTH) OldWidth,
Address, OldCount, Buffer);
}
/**
Enables a PCI driver to access PCI controller registers in the PCI root bridge memory space.
The Mem.Read(), and Mem.Write() functions enable a driver to access PCI controller
registers in the PCI root bridge memory space.
The memory operations are carried out exactly as requested. The caller is responsible for satisfying
any alignment and memory width restrictions that a PCI Root Bridge on a platform might require.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Width Signifies the width of the memory operation.
@param[in] Address The base address of the memory operation. The caller is
responsible for aligning the Address if required.
@param[in] Count The number of memory operations to perform. Bytes moved is
Width size * Count, starting at Address.
@param[out] 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_INVALID_PARAMETER Width is invalid for this PCI root bridge.
@retval EFI_INVALID_PARAMETER Buffer is NULL.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
**/
EFI_STATUS
EFIAPI
RootBridgeIoMemWrite (
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
)
{
PCI_ROOT_BRIDGE_INSTANCE *PrivateData;
EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH OldWidth;
UINTN OldCount;
if (Buffer == NULL) {
return EFI_INVALID_PARAMETER;
}
if (Width < 0 || Width >= EfiPciWidthMaximum) {
return EFI_INVALID_PARAMETER;
}
PrivateData = DRIVER_INSTANCE_FROM_PCI_ROOT_BRIDGE_IO_THIS(This);
//
// Check memory access limit
//
if (Address < PrivateData->MemBase) {
return EFI_INVALID_PARAMETER;
}
OldWidth = Width;
OldCount = Count;
if (Width >= EfiPciWidthFifoUint8 && Width <= EfiPciWidthFifoUint64) {
Count = 1;
}
Width = (EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH)(Width & 0x03);
if (Address + (((UINTN)1 << Width) * Count) - 1 > PrivateData->MemLimit) {
return EFI_INVALID_PARAMETER;
}
return mCpuIo->Mem.Write (mCpuIo, (EFI_CPU_IO_PROTOCOL_WIDTH) OldWidth,
Address, OldCount, Buffer);
}
/**
Enables a PCI driver to access PCI controller registers in the PCI root bridge I/O space.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Width Signifies the width of the memory operations.
@param[in] Address The base address of the I/O operation. The caller is responsible for
aligning the Address if required.
@param[in] Count The number of I/O operations to perform. Bytes moved is Width
size * Count, starting at Address.
@param[out] 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_INVALID_PARAMETER Width is invalid for this PCI root bridge.
@retval EFI_INVALID_PARAMETER Buffer is NULL.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
**/
EFI_STATUS
EFIAPI
RootBridgeIoIoRead (
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
)
{
UINTN AlignMask;
PCI_ROOT_BRIDGE_INSTANCE *PrivateData;
EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH OldWidth;
UINTN OldCount;
if (Buffer == NULL) {
return EFI_INVALID_PARAMETER;
}
if (Width < 0 || Width >= EfiPciWidthMaximum) {
return EFI_INVALID_PARAMETER;
}
PrivateData = DRIVER_INSTANCE_FROM_PCI_ROOT_BRIDGE_IO_THIS(This);
//AlignMask = (1 << Width) - 1;
AlignMask = (1 << (Width & 0x03)) - 1;
//
// check Io access limit
//
if (Address < PrivateData->IoBase) {
return EFI_INVALID_PARAMETER;
}
OldWidth = Width;
OldCount = Count;
if (Width >= EfiPciWidthFifoUint8 && Width <= EfiPciWidthFifoUint64) {
Count = 1;
}
Width = (EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH)(Width & 0x03);
if (Address + (((UINTN)1 << Width) * Count) - 1 >= PrivateData->IoLimit) {
return EFI_INVALID_PARAMETER;
}
if (Address & AlignMask) {
return EFI_INVALID_PARAMETER;
}
return mCpuIo->Io.Read (mCpuIo, (EFI_CPU_IO_PROTOCOL_WIDTH) OldWidth,
Address, OldCount, Buffer);
}
/**
Enables a PCI driver to access PCI controller registers in the PCI root bridge I/O space.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Width Signifies the width of the memory operations.
@param[in] Address The base address of the I/O operation. The caller is responsible for
aligning the Address if required.
@param[in] Count The number of I/O operations to perform. Bytes moved is Width
size * Count, starting at Address.
@param[out] 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_INVALID_PARAMETER Width is invalid for this PCI root bridge.
@retval EFI_INVALID_PARAMETER Buffer is NULL.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
**/
EFI_STATUS
EFIAPI
RootBridgeIoIoWrite (
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
)
{
UINTN AlignMask;
PCI_ROOT_BRIDGE_INSTANCE *PrivateData;
EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH OldWidth;
UINTN OldCount;
if (Buffer == NULL) {
return EFI_INVALID_PARAMETER;
}
if (Width < 0 || Width >= EfiPciWidthMaximum) {
return EFI_INVALID_PARAMETER;
}
PrivateData = DRIVER_INSTANCE_FROM_PCI_ROOT_BRIDGE_IO_THIS(This);
//AlignMask = (1 << Width) - 1;
AlignMask = (1 << (Width & 0x03)) - 1;
//
// Check Io access limit
//
if (Address < PrivateData->IoBase) {
return EFI_INVALID_PARAMETER;
}
OldWidth = Width;
OldCount = Count;
if (Width >= EfiPciWidthFifoUint8 && Width <= EfiPciWidthFifoUint64) {
Count = 1;
}
Width = (EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH)(Width & 0x03);
if (Address + (((UINTN)1 << Width) * Count) - 1 >= PrivateData->IoLimit) {
return EFI_INVALID_PARAMETER;
}
if (Address & AlignMask) {
return EFI_INVALID_PARAMETER;
}
return mCpuIo->Io.Write (mCpuIo, (EFI_CPU_IO_PROTOCOL_WIDTH) OldWidth,
Address, OldCount, Buffer);
}
/**
Enables a PCI driver to copy one region of PCI root bridge memory space to another region of PCI
root bridge memory space.
The CopyMem() function enables a PCI driver to copy one region of PCI root bridge memory
space to another region of PCI root bridge memory space. This is especially useful for video scroll
operation on a memory mapped video buffer.
The memory operations are carried out exactly as requested. The caller is responsible for satisfying
any alignment and memory width restrictions that a PCI root bridge on a platform might require.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL instance.
@param[in] Width Signifies the width of the memory operations.
@param[in] DestAddress The destination address of the memory operation. The caller is
responsible for aligning the DestAddress if required.
@param[in] SrcAddress The source address of the memory operation. The caller is
responsible for aligning the SrcAddress if required.
@param[in] Count The number of memory operations to perform. Bytes moved is
Width size * Count, starting at DestAddress and SrcAddress.
@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.
**/
EFI_STATUS
EFIAPI
RootBridgeIoCopyMem (
IN struct _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
)
{
EFI_STATUS Status;
BOOLEAN Direction;
UINTN Stride;
UINTN Index;
UINT64 Result;
if (Width < 0 || Width > EfiPciWidthUint64) {
return EFI_INVALID_PARAMETER;
}
if (DestAddress == SrcAddress) {
return EFI_SUCCESS;
}
Stride = (UINTN)(1 << Width);
Direction = TRUE;
if ((DestAddress > SrcAddress) && (DestAddress < (SrcAddress + Count * Stride))) {
Direction = FALSE;
SrcAddress = SrcAddress + (Count-1) * Stride;
DestAddress = DestAddress + (Count-1) * Stride;
}
for (Index = 0;Index < Count;Index++) {
Status = RootBridgeIoMemRead (
This,
Width,
SrcAddress,
1,
&Result
);
if (EFI_ERROR (Status)) {
return Status;
}
Status = RootBridgeIoMemWrite (
This,
Width,
DestAddress,
1,
&Result
);
if (EFI_ERROR (Status)) {
return Status;
}
if (Direction) {
SrcAddress += Stride;
DestAddress += Stride;
} else {
SrcAddress -= Stride;
DestAddress -= Stride;
}
}
return EFI_SUCCESS;
}
/**
Enables a PCI driver to access PCI controller registers in a PCI root bridge's configuration space.
The Pci.Read() and Pci.Write() functions enable a driver to access PCI configuration
registers for a PCI controller.
The PCI Configuration operations are carried out exactly as requested. The caller is responsible for
any alignment and PCI configuration width issues that a PCI Root Bridge on a platform might
require.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Width Signifies the width of the memory operations.
@param[in] Address The address within the PCI configuration space for the PCI controller.
@param[in] Count The number of PCI configuration operations to perform. Bytes
moved is Width size * Count, starting at Address.
@param[out] 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_INVALID_PARAMETER Width is invalid for this PCI root bridge.
@retval EFI_INVALID_PARAMETER Buffer is NULL.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
**/
EFI_STATUS
EFIAPI
RootBridgeIoPciRead (
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
)
{
if (Buffer == NULL) {
return EFI_INVALID_PARAMETER;
}
if (Width < 0 || Width >= EfiPciWidthMaximum) {
return EFI_INVALID_PARAMETER;
}
//
// Read Pci configuration space
//
return RootBridgeIoPciRW (This, FALSE, Width, Address, Count, Buffer);
}
/**
Enables a PCI driver to access PCI controller registers in a PCI root bridge's configuration space.
The Pci.Read() and Pci.Write() functions enable a driver to access PCI configuration
registers for a PCI controller.
The PCI Configuration operations are carried out exactly as requested. The caller is responsible for
any alignment and PCI configuration width issues that a PCI Root Bridge on a platform might
require.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Width Signifies the width of the memory operations.
@param[in] Address The address within the PCI configuration space for the PCI controller.
@param[in] Count The number of PCI configuration operations to perform. Bytes
moved is Width size * Count, starting at Address.
@param[out] 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_INVALID_PARAMETER Width is invalid for this PCI root bridge.
@retval EFI_INVALID_PARAMETER Buffer is NULL.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
**/
EFI_STATUS
EFIAPI
RootBridgeIoPciWrite (
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
)
{
if (Buffer == NULL) {
return EFI_INVALID_PARAMETER;
}
if (Width < 0 || Width >= EfiPciWidthMaximum) {
return EFI_INVALID_PARAMETER;
}
//
// Write Pci configuration space
//
return RootBridgeIoPciRW (This, TRUE, Width, Address, Count, Buffer);
}
/**
Provides the PCI controller-specific addresses required to access system memory from a
DMA bus master.
The Map() function provides the PCI controller specific addresses needed to access system
memory. This function is used to map system memory for PCI bus master DMA accesses.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Operation Indicates if the bus master is going to read or write to system memory.
@param[in] HostAddress The system memory address to map to the PCI controller.
@param[in][out] NumberOfBytes On input the number of bytes to map. On output the number of bytes that were mapped.
@param[out] DeviceAddress The resulting map address for the bus master PCI controller to use
to access the system memory's HostAddress.
@param[out] Mapping The value to pass to Unmap() when the bus master DMA operation is complete.
@retval EFI_SUCCESS The range was mapped for the returned NumberOfBytes.
@retval EFI_INVALID_PARAMETER Operation is invalid.
@retval EFI_INVALID_PARAMETER HostAddress is NULL.
@retval EFI_INVALID_PARAMETER NumberOfBytes is NULL.
@retval EFI_INVALID_PARAMETER DeviceAddress is NULL.
@retval EFI_INVALID_PARAMETER Mapping is NULL.
@retval EFI_UNSUPPORTED The HostAddress cannot be mapped as a common buffer.
@retval EFI_DEVICE_ERROR The system hardware could not map the requested address.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
**/
EFI_STATUS
EFIAPI
RootBridgeIoMap (
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
)
{
EFI_STATUS Status;
EFI_PHYSICAL_ADDRESS PhysicalAddress;
MAP_INFO *MapInfo;
if (HostAddress == NULL || NumberOfBytes == NULL || DeviceAddress == NULL || Mapping == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// Initialize the return values to their defaults
//
*Mapping = NULL;
//
// Make sure that Operation is valid
//
if (Operation < 0 || Operation >= EfiPciOperationMaximum) {
return EFI_INVALID_PARAMETER;
}
//
// Most PCAT like chipsets can not handle performing DMA above 4GB.
// If any part of the DMA transfer being mapped is above 4GB, then
// map the DMA transfer to a buffer below 4GB.
//
PhysicalAddress = (EFI_PHYSICAL_ADDRESS) (UINTN) HostAddress;
if ((PhysicalAddress + *NumberOfBytes) > 0x100000000ULL) {
//
// Common Buffer operations can not be remapped. If the common buffer
// if above 4GB, then it is not possible to generate a mapping, so return
// an error.
//
if (Operation == EfiPciOperationBusMasterCommonBuffer || Operation == EfiPciOperationBusMasterCommonBuffer64) {
return EFI_UNSUPPORTED;
}
//
// Allocate a MAP_INFO structure to remember the mapping when Unmap() is
// called later.
//
Status = gBS->AllocatePool (
EfiBootServicesData,
sizeof(MAP_INFO),
(VOID **)&MapInfo
);
if (EFI_ERROR (Status)) {
*NumberOfBytes = 0;
return Status;
}
//
// Return a pointer to the MAP_INFO structure in Mapping
//
*Mapping = MapInfo;
//
// Initialize the MAP_INFO structure
//
MapInfo->Operation = Operation;
MapInfo->NumberOfBytes = *NumberOfBytes;
MapInfo->NumberOfPages = EFI_SIZE_TO_PAGES(*NumberOfBytes);
MapInfo->HostAddress = PhysicalAddress;
MapInfo->MappedHostAddress = 0x00000000ffffffff;
//
// Allocate a buffer below 4GB to map the transfer to.
//
Status = gBS->AllocatePages (
AllocateMaxAddress,
EfiBootServicesData,
MapInfo->NumberOfPages,
&MapInfo->MappedHostAddress
);
if (EFI_ERROR (Status)) {
gBS->FreePool (MapInfo);
*NumberOfBytes = 0;
return Status;
}
//
// If this is a read operation from the Bus Master's point of view,
// then copy the contents of the real buffer into the mapped buffer
// so the Bus Master can read the contents of the real buffer.
//
if (Operation == EfiPciOperationBusMasterRead || Operation == EfiPciOperationBusMasterRead64) {
CopyMem (
(VOID *)(UINTN)MapInfo->MappedHostAddress,
(VOID *)(UINTN)MapInfo->HostAddress,
MapInfo->NumberOfBytes
);
}
//
// The DeviceAddress is the address of the maped buffer below 4GB
//
*DeviceAddress = MapInfo->MappedHostAddress;
} else {
//
// The transfer is below 4GB, so the DeviceAddress is simply the HostAddress
//
*DeviceAddress = PhysicalAddress;
}
return EFI_SUCCESS;
}
/**
Completes the Map() operation and releases any corresponding resources.
The Unmap() function completes the Map() operation and releases any corresponding resources.
If the operation was an EfiPciOperationBusMasterWrite or
EfiPciOperationBusMasterWrite64, the data is committed to the target system memory.
Any resources used for the mapping are freed.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] 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.
**/
EFI_STATUS
EFIAPI
RootBridgeIoUnmap (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
IN VOID *Mapping
)
{
MAP_INFO *MapInfo;
//
// See if the Map() operation associated with this Unmap() required a mapping buffer.
// If a mapping buffer was not required, then this function simply returns EFI_SUCCESS.
//
if (Mapping != NULL) {
//
// Get the MAP_INFO structure from Mapping
//
MapInfo = (MAP_INFO *)Mapping;
//
// If this is a write operation from the Bus Master's point of view,
// then copy the contents of the mapped buffer into the real buffer
// so the processor can read the contents of the real buffer.
//
if (MapInfo->Operation == EfiPciOperationBusMasterWrite || MapInfo->Operation == EfiPciOperationBusMasterWrite64) {
CopyMem (
(VOID *)(UINTN)MapInfo->HostAddress,
(VOID *)(UINTN)MapInfo->MappedHostAddress,
MapInfo->NumberOfBytes
);
}
//
// Free the mapped buffer and the MAP_INFO structure.
//
gBS->FreePages (MapInfo->MappedHostAddress, MapInfo->NumberOfPages);
gBS->FreePool (Mapping);
}
return EFI_SUCCESS;
}
/**
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. Only
the attributes EFI_PCI_ATTRIBUTE_MEMORY_WRITE_COMBINE, EFI_PCI_ATTRIBUTE_MEMORY_CACHED,
and EFI_PCI_ATTRIBUTE_DUAL_ADDRESS_CYCLE may be used with this function.
@retval EFI_SUCCESS The requested memory pages were allocated.
@retval EFI_INVALID_PARAMETER MemoryType is invalid.
@retval EFI_INVALID_PARAMETER HostAddress is NULL.
@retval EFI_UNSUPPORTED Attributes is unsupported. The only legal attribute bits are
MEMORY_WRITE_COMBINE, MEMORY_CACHED, and DUAL_ADDRESS_CYCLE.
@retval EFI_OUT_OF_RESOURCES The memory pages could not be allocated.
**/
EFI_STATUS
EFIAPI
RootBridgeIoAllocateBuffer (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
IN EFI_ALLOCATE_TYPE Type,
IN EFI_MEMORY_TYPE MemoryType,
IN UINTN Pages,
OUT VOID **HostAddress,
IN UINT64 Attributes
)
{
EFI_STATUS Status;
EFI_PHYSICAL_ADDRESS PhysicalAddress;
//
// Validate Attributes
//
if (Attributes & EFI_PCI_ATTRIBUTE_INVALID_FOR_ALLOCATE_BUFFER) {
return EFI_UNSUPPORTED;
}
//
// Check for invalid inputs
//
if (HostAddress == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// The only valid memory types are EfiBootServicesData and EfiRuntimeServicesData
//
if (MemoryType != EfiBootServicesData && MemoryType != EfiRuntimeServicesData) {
return EFI_INVALID_PARAMETER;
}
//
// Limit allocations to memory below 4GB
//
PhysicalAddress = (EFI_PHYSICAL_ADDRESS)(0xffffffff);
Status = gBS->AllocatePages (AllocateMaxAddress, MemoryType, Pages, &PhysicalAddress);
if (EFI_ERROR (Status)) {
return Status;
}
*HostAddress = (VOID *)(UINTN)PhysicalAddress;
return EFI_SUCCESS;
}
/**
Frees memory that was allocated with AllocateBuffer().
The FreeBuffer() function 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().
**/
EFI_STATUS
EFIAPI
RootBridgeIoFreeBuffer (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
IN UINTN Pages,
OUT VOID *HostAddress
)
{
return gBS->FreePages ((EFI_PHYSICAL_ADDRESS) (UINTN) HostAddress, Pages);
}
/**
Flushes all PCI posted write transactions from a PCI host bridge to system memory.
The Flush() function flushes any PCI posted write transactions from a PCI host bridge to system
memory. Posted write transactions are generated by PCI bus masters when they perform write
transactions to target addresses in system memory.
This function does not flush posted write transactions from any PCI bridges. A PCI controller
specific action must be taken to guarantee that the posted write transactions have been flushed from
the PCI controller and from all the PCI bridges into the PCI host bridge. This is typically done with
a PCI read transaction from the PCI controller prior to calling Flush().
@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.
**/
EFI_STATUS
EFIAPI
RootBridgeIoFlush (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This
)
{
//
// not supported yet
//
return EFI_SUCCESS;
}
/**
Gets the attributes that a PCI root bridge supports setting with SetAttributes(), and the
attributes that a PCI root bridge is currently using.
The GetAttributes() function returns the mask of attributes that this PCI root bridge supports
and the mask of attributes that the PCI root bridge is currently using.
@param This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param Supported 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.
**/
EFI_STATUS
EFIAPI
RootBridgeIoGetAttributes (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
OUT UINT64 *Supported,
OUT UINT64 *Attributes
)
{
PCI_ROOT_BRIDGE_INSTANCE *PrivateData;
PrivateData = DRIVER_INSTANCE_FROM_PCI_ROOT_BRIDGE_IO_THIS(This);
if (Attributes == NULL && Supported == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// Set the return value for Supported and Attributes
//
if (Supported) {
*Supported = PrivateData->Supports;
}
if (Attributes) {
*Attributes = PrivateData->Attributes;
}
return EFI_SUCCESS;
}
/**
Sets attributes for a resource range on a PCI root bridge.
The SetAttributes() function sets the attributes specified in Attributes for the PCI root
bridge on the resource range specified by ResourceBase and ResourceLength. Since the
granularity of setting these attributes may vary from resource type to resource type, and from
platform to platform, the actual resource range and the one passed in by the caller may differ. As a
result, this function may set the attributes specified by Attributes on a larger resource range
than the caller requested. The actual range is returned in ResourceBase and
ResourceLength. The caller is responsible for verifying that the actual range for which the
attributes were set is acceptable.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Attributes The mask of attributes to set. If the attribute bit
MEMORY_WRITE_COMBINE, MEMORY_CACHED, or
MEMORY_DISABLE is set, then the resource range is specified by
ResourceBase and ResourceLength. If
MEMORY_WRITE_COMBINE, MEMORY_CACHED, and
MEMORY_DISABLE are not set, then ResourceBase and
ResourceLength are ignored, and may be NULL.
@param[in][out] ResourceBase A pointer to the base address of the resource range to be modified
by the attributes specified by Attributes.
@param[in][out] ResourceLength A pointer to the length of the resource range to be modified by the
attributes specified by Attributes.
@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.
@retval EFI_INVALID_PARAMETER Invalid pointer of EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL
**/
EFI_STATUS
EFIAPI
RootBridgeIoSetAttributes (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
IN UINT64 Attributes,
IN OUT UINT64 *ResourceBase,
IN OUT UINT64 *ResourceLength
)
{
PCI_ROOT_BRIDGE_INSTANCE *PrivateData;
PrivateData = DRIVER_INSTANCE_FROM_PCI_ROOT_BRIDGE_IO_THIS(This);
if (Attributes) {
if ((Attributes & (~(PrivateData->Supports))) != 0) {
return EFI_UNSUPPORTED;
}
}
//
// This is a generic driver for a PC-AT class system. It does not have any
// chipset specific knowlegde, so none of the attributes can be set or
// cleared. Any attempt to set attribute that are already set will succeed,
// and any attempt to set an attribute that is not supported will fail.
//
if (Attributes & (~PrivateData->Attributes)) {
return EFI_UNSUPPORTED;
}
return EFI_SUCCESS;
}
/**
Retrieves the current resource settings of this PCI root bridge in the form of a set of ACPI 2.0
resource descriptors.
There are only two resource descriptor types from the ACPI Specification that may be used to
describe the current resources allocated to a PCI root bridge. These are the QWORD Address
Space Descriptor (ACPI 2.0 Section 6.4.3.5.1), and the End Tag (ACPI 2.0 Section 6.4.2.8). The
QWORD Address Space Descriptor can describe memory, I/O, and bus number ranges for dynamic
or fixed resources. The configuration of a PCI root bridge is described with one or more QWORD
Address Space Descriptors followed by an End Tag.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[out] Resources A pointer to the ACPI 2.0 resource descriptors that describe the
current configuration of this PCI root bridge. The storage for the
ACPI 2.0 resource descriptors is allocated by this function. The
caller must treat the return buffer as read-only data, and the buffer
must not be freed by the caller.
@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.
@retval EFI_INVALID_PARAMETER Invalid pointer of EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL
**/
EFI_STATUS
EFIAPI
RootBridgeIoConfiguration (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
OUT VOID **Resources
)
{
PCI_ROOT_BRIDGE_INSTANCE *PrivateData;
UINTN Index;
PrivateData = DRIVER_INSTANCE_FROM_PCI_ROOT_BRIDGE_IO_THIS (This);
for (Index = 0; Index < TypeMax; Index++) {
if (PrivateData->ResAllocNode[Index].Status == ResAllocated) {
Configuration.SpaceDesp[Index].AddrRangeMin = PrivateData->ResAllocNode[Index].Base;
Configuration.SpaceDesp[Index].AddrRangeMax = PrivateData->ResAllocNode[Index].Base + PrivateData->ResAllocNode[Index].Length - 1;
Configuration.SpaceDesp[Index].AddrLen = PrivateData->ResAllocNode[Index].Length;
}
}
*Resources = &Configuration;
return EFI_SUCCESS;
}
//
// Internal function
//
/**
Internal help function for read and write PCI configuration space.
@param[in] This A pointer to the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
@param[in] Write Switch value for Read or Write.
@param[in] Width Signifies the width of the memory operations.
@param[in] UserAddress The address within the PCI configuration space for the PCI controller.
@param[in] Count The number of PCI configuration operations to perform. Bytes
moved is Width size * Count, starting at Address.
@param[out] UserBuffer 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_INVALID_PARAMETER Width is invalid for this PCI root bridge.
@retval EFI_INVALID_PARAMETER Buffer is NULL.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
**/
EFI_STATUS
RootBridgeIoPciRW (
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *This,
IN BOOLEAN Write,
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH Width,
IN UINT64 UserAddress,
IN UINTN Count,
IN OUT VOID *UserBuffer
)
{
PCI_CONFIG_ACCESS_CF8 Pci;
PCI_CONFIG_ACCESS_CF8 PciAligned;
UINT32 InStride;
UINT32 OutStride;
UINTN PciData;
UINTN PciDataStride;
PCI_ROOT_BRIDGE_INSTANCE *PrivateData;
EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_PCI_ADDRESS PciAddress;
if (Width < 0 || Width >= EfiPciWidthMaximum) {
return EFI_INVALID_PARAMETER;
}
if ((Width & 0x03) >= EfiPciWidthUint64) {
return EFI_INVALID_PARAMETER;
}
PrivateData = DRIVER_INSTANCE_FROM_PCI_ROOT_BRIDGE_IO_THIS(This);
InStride = 1 << (Width & 0x03);
OutStride = InStride;
if (Width >= EfiCpuIoWidthFifoUint8 && Width <= EfiCpuIoWidthFifoUint64) {
InStride = 0;
}
if (Width >= EfiCpuIoWidthFillUint8 && Width <= EfiCpuIoWidthFillUint64) {
OutStride = 0;
}
CopyMem (&PciAddress, &UserAddress, sizeof(UINT64));
if (PciAddress.ExtendedRegister > 0xFF) {
return EFI_UNSUPPORTED;
}
if (PciAddress.ExtendedRegister != 0) {
Pci.Bits.Reg = PciAddress.ExtendedRegister & 0xFF;
} else {
Pci.Bits.Reg = PciAddress.Register;
}
Pci.Bits.Func = PciAddress.Function;
Pci.Bits.Dev = PciAddress.Device;
Pci.Bits.Bus = PciAddress.Bus;
Pci.Bits.Reserved = 0;
Pci.Bits.Enable = 1;
//
// PCI Config access are all 32-bit alligned, but by accessing the
// CONFIG_DATA_REGISTER (0xcfc) with different widths more cycle types
// are possible on PCI.
//
// To read a byte of PCI config space you load 0xcf8 and
// read 0xcfc, 0xcfd, 0xcfe, 0xcff
//
PciDataStride = Pci.Bits.Reg & 0x03;
while (Count) {
CopyMem (&PciAligned, &Pci, sizeof (PciAligned));
PciAligned.Bits.Reg &= 0xfc;
PciData = (UINTN)PrivateData->PciData + PciDataStride;
EfiAcquireLock(&PrivateData->PciLock);
This->Io.Write (This, EfiPciWidthUint32, PrivateData->PciAddress, 1, &PciAligned);
if (Write) {
This->Io.Write (This, Width, PciData, 1, UserBuffer);
} else {
This->Io.Read (This, Width, PciData, 1, UserBuffer);
}
EfiReleaseLock(&PrivateData->PciLock);
UserBuffer = ((UINT8 *)UserBuffer) + OutStride;
PciDataStride = (PciDataStride + InStride) % 4;
Pci.Bits.Reg += InStride;
Count -= 1;
}
return EFI_SUCCESS;
}
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