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system76-edk2/MdePkg/Library/UefiPciSegmentLibPciRootBridgeIo/PciSegmentLib.c
Michael D Kinney 9344f09215 MdePkg: Replace BSD License with BSD+Patent License 
https://bugzilla.tianocore.org/show_bug.cgi?id=1373

Replace BSD 2-Clause License with BSD+Patent License.  This change is
based on the following emails:

  https://lists.01.org/pipermail/edk2-devel/2019-February/036260.html
  https://lists.01.org/pipermail/edk2-devel/2018-October/030385.html

RFCs with detailed process for the license change:

  V3: https://lists.01.org/pipermail/edk2-devel/2019-March/038116.html
  V2: https://lists.01.org/pipermail/edk2-devel/2019-March/037669.html
  V1: https://lists.01.org/pipermail/edk2-devel/2019-March/037500.html

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
2019-04-09 10:58:13 -07:00

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/** @file
PCI Segment Library implementation using PCI Root Bridge I/O Protocol.
Copyright (c) 2007 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "PciSegmentLib.h"
//
// Global variable to record data of PCI Root Bridge I/O Protocol instances
//
PCI_ROOT_BRIDGE_DATA *mPciRootBridgeData = NULL;
UINTN mNumberOfPciRootBridges = 0;
/**
The constructor function caches data of PCI Root Bridge I/O Protocol instances.
The constructor function locates PCI Root Bridge I/O protocol instances,
and caches the protocol instances, together with their segment numbers and bus ranges.
It will ASSERT() if that related operation fails and it will always return EFI_SUCCESS.
@param ImageHandle The firmware allocated handle for the EFI image.
@param SystemTable A pointer to the EFI System Table.
@retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
**/
EFI_STATUS
EFIAPI
PciSegmentLibConstructor (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
UINTN Index;
UINTN HandleCount;
EFI_HANDLE *HandleBuffer;
EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *PciRootBridgeIo;
EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *Descriptors;
HandleCount = 0;
HandleBuffer = NULL;
PciRootBridgeIo = NULL;
Descriptors = NULL;
Status = gBS->LocateHandleBuffer (
ByProtocol,
&gEfiPciRootBridgeIoProtocolGuid,
NULL,
&HandleCount,
&HandleBuffer
);
ASSERT_EFI_ERROR (Status);
mNumberOfPciRootBridges = HandleCount;
mPciRootBridgeData = AllocatePool (HandleCount * sizeof (PCI_ROOT_BRIDGE_DATA));
ASSERT (mPciRootBridgeData != NULL);
//
// Traverse all PCI Root Bridge I/O Protocol instances, and record the protocol
// instances, together with their segment numbers and bus ranges.
//
for (Index = 0; Index < HandleCount; Index++) {
Status = gBS->HandleProtocol (
HandleBuffer[Index],
&gEfiPciRootBridgeIoProtocolGuid,
(VOID **) &PciRootBridgeIo
);
ASSERT_EFI_ERROR (Status);
mPciRootBridgeData[Index].PciRootBridgeIo = PciRootBridgeIo;
mPciRootBridgeData[Index].SegmentNumber = PciRootBridgeIo->SegmentNumber;
Status = PciRootBridgeIo->Configuration (PciRootBridgeIo, (VOID **) &Descriptors);
ASSERT_EFI_ERROR (Status);
while (Descriptors->Desc != ACPI_END_TAG_DESCRIPTOR) {
if (Descriptors->ResType == ACPI_ADDRESS_SPACE_TYPE_BUS) {
mPciRootBridgeData[Index].MinBusNumber = Descriptors->AddrRangeMin;
mPciRootBridgeData[Index].MaxBusNumber = Descriptors->AddrRangeMax;
break;
}
Descriptors++;
}
ASSERT (Descriptors->Desc != ACPI_END_TAG_DESCRIPTOR);
}
FreePool(HandleBuffer);
return EFI_SUCCESS;
}
/**
The destructor function frees memory allocated by constructor.
The destructor function frees memory for data of protocol instances allocated by constructor.
It will ASSERT() if that related operation fails and it will always return EFI_SUCCESS.
@param ImageHandle The firmware allocated handle for the EFI image.
@param SystemTable A pointer to the EFI System Table.
@retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
**/
EFI_STATUS
EFIAPI
PciSegmentLibDestructor (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
FreePool (mPciRootBridgeData);
return EFI_SUCCESS;
}
/**
According to address, search for the corresponding PCI Root Bridge I/O Protocol instance.
This internal function extracts segment number and bus number data from address, and
retrieves the corresponding PCI Root Bridge I/O Protocol instance.
@param Address The address that encodes the Segment, PCI Bus, Device, Function and
Register.
@return The address for PCI Root Bridge I/O Protocol.
**/
EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *
PciSegmentLibSearchForRootBridge (
IN UINT64 Address
)
{
UINTN Index;
UINT64 SegmentNumber;
UINT64 BusNumber;
for (Index = 0; Index < mNumberOfPciRootBridges; Index++) {
//
// Matches segment number of address with the segment number of protocol instance.
//
SegmentNumber = BitFieldRead64 (Address, 32, 63);
if (SegmentNumber == mPciRootBridgeData[Index].SegmentNumber) {
//
// Matches the bus number of address with bus number range of protocol instance.
//
BusNumber = BitFieldRead64 (Address, 20, 27);
if (BusNumber >= mPciRootBridgeData[Index].MinBusNumber && BusNumber <= mPciRootBridgeData[Index].MaxBusNumber) {
return mPciRootBridgeData[Index].PciRootBridgeIo;
}
}
}
return NULL;
}
/**
Internal worker function to read a PCI configuration register.
This function wraps EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.Pci.Read() service.
It reads and returns the PCI configuration register specified by Address,
the width of data is specified by Width.
@param Address The address that encodes the PCI Bus, Device, Function and
Register.
@param Width Width of data to read
@return The value read from the PCI configuration register.
**/
UINT32
DxePciSegmentLibPciRootBridgeIoReadWorker (
IN UINT64 Address,
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH Width
)
{
UINT32 Data;
EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *PciRootBridgeIo;
PciRootBridgeIo = PciSegmentLibSearchForRootBridge (Address);
ASSERT (PciRootBridgeIo != NULL);
PciRootBridgeIo->Pci.Read (
PciRootBridgeIo,
Width,
PCI_TO_PCI_ROOT_BRIDGE_IO_ADDRESS (Address),
1,
&Data
);
return Data;
}
/**
Internal worker function to writes a PCI configuration register.
This function wraps EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.Pci.Write() service.
It writes the PCI configuration register specified by Address with the
value specified by Data. The width of data is specifed by Width.
Data is returned.
@param Address The address that encodes the PCI Bus, Device, Function and
Register.
@param Width Width of data to write
@param Data The value to write.
@return The value written to the PCI configuration register.
**/
UINT32
DxePciSegmentLibPciRootBridgeIoWriteWorker (
IN UINT64 Address,
IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH Width,
IN UINT32 Data
)
{
EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *PciRootBridgeIo;
PciRootBridgeIo = PciSegmentLibSearchForRootBridge (Address);
ASSERT (PciRootBridgeIo != NULL);
PciRootBridgeIo->Pci.Write (
PciRootBridgeIo,
Width,
PCI_TO_PCI_ROOT_BRIDGE_IO_ADDRESS (Address),
1,
&Data
);
return Data;
}
/**
Register a PCI device so PCI configuration registers may be accessed after
SetVirtualAddressMap().
If any reserved bits in Address are set, then ASSERT().
@param Address Address that encodes the PCI Bus, Device, Function and
Register.
@retval RETURN_SUCCESS The PCI device was registered for runtime access.
@retval RETURN_UNSUPPORTED An attempt was made to call this function
after ExitBootServices().
@retval RETURN_UNSUPPORTED The resources required to access the PCI device
at runtime could not be mapped.
@retval RETURN_OUT_OF_RESOURCES There are not enough resources available to
complete the registration.
**/
RETURN_STATUS
EFIAPI
PciSegmentRegisterForRuntimeAccess (
IN UINTN Address
)
{
ASSERT_INVALID_PCI_SEGMENT_ADDRESS (Address, 0);
return RETURN_UNSUPPORTED;
}
/**
Reads an 8-bit PCI configuration register.
Reads and returns the 8-bit PCI configuration register specified by Address.
This function must guarantee that all PCI read and write operations are serialized.
If any reserved bits in Address are set, then ASSERT().
@param Address Address that encodes the PCI Segment, Bus, Device, Function, and Register.
@return The 8-bit PCI configuration register specified by Address.
**/
UINT8
EFIAPI
PciSegmentRead8 (
IN UINT64 Address
)
{
ASSERT_INVALID_PCI_SEGMENT_ADDRESS (Address, 0);
return (UINT8) DxePciSegmentLibPciRootBridgeIoReadWorker (Address, EfiPciWidthUint8);
}
/**
Writes an 8-bit PCI configuration register.
Writes the 8-bit PCI configuration register specified by Address with the value specified by Value.
Value is returned. This function must guarantee that all PCI read and write operations are serialized.
If any reserved bits in Address are set, then ASSERT().
@param Address Address that encodes the PCI Segment, Bus, Device, Function, and Register.
@param Value The value to write.
@return The value written to the PCI configuration register.
**/
UINT8
EFIAPI
PciSegmentWrite8 (
IN UINT64 Address,
IN UINT8 Value
)
{
ASSERT_INVALID_PCI_SEGMENT_ADDRESS (Address, 0);
return (UINT8) DxePciSegmentLibPciRootBridgeIoWriteWorker (Address, EfiPciWidthUint8, Value);
}
/**
Performs a bitwise OR of an 8-bit PCI configuration register with an 8-bit value.
Reads the 8-bit PCI configuration register specified by Address,
performs a bitwise OR between the read result and the value specified by OrData,
and writes the result to the 8-bit PCI configuration register specified by Address.
The value written to the PCI configuration register is returned.
This function must guarantee that all PCI read and write operations are serialized.
If any reserved bits in Address are set, then ASSERT().
@param Address Address that encodes the PCI Segment, Bus, Device, Function, and Register.
@param OrData The value to OR with the PCI configuration register.
@return The value written to the PCI configuration register.
**/
UINT8
EFIAPI
PciSegmentOr8 (
IN UINT64 Address,
IN UINT8 OrData
)
{
return PciSegmentWrite8 (Address, (UINT8) (PciSegmentRead8 (Address) | OrData));
}
/**
Performs a bitwise AND of an 8-bit PCI configuration register with an 8-bit value.
Reads the 8-bit PCI configuration register specified by Address,
performs a bitwise AND between the read result and the value specified by AndData,
and writes the result to the 8-bit PCI configuration register specified by Address.
The value written to the PCI configuration register is returned.
This function must guarantee that all PCI read and write operations are serialized.
If any reserved bits in Address are set, then ASSERT().
@param Address Address that encodes the PCI Segment, Bus, Device, Function, and Register.
@param AndData The value to AND with the PCI configuration register.
@return The value written to the PCI configuration register.
**/
UINT8
EFIAPI
PciSegmentAnd8 (
IN UINT64 Address,
IN UINT8 AndData
)
{
return PciSegmentWrite8 (Address, (UINT8) (PciSegmentRead8 (Address) & AndData));
}
/**
Performs a bitwise AND of an 8-bit PCI configuration register with an 8-bit value,
followed a bitwise OR with another 8-bit value.
Reads the 8-bit PCI configuration register specified by Address,
performs a bitwise AND between the read result and the value specified by AndData,
performs a bitwise OR between the result of the AND operation and the value specified by OrData,
and writes the result to the 8-bit PCI configuration register specified by Address.
The value written to the PCI configuration register is returned.
This function must guarantee that all PCI read and write operations are serialized.
If any reserved bits in Address are set, then ASSERT().
@param Address Address that encodes the PCI Segment, Bus, Device, Function, and Register.
@param AndData The value to AND with the PCI configuration register.
@param OrData The value to OR with the PCI configuration register.
@return The value written to the PCI configuration register.
**/
UINT8
EFIAPI
PciSegmentAndThenOr8 (
IN UINT64 Address,
IN UINT8 AndData,
IN UINT8 OrData
)
{
return PciSegmentWrite8 (Address, (UINT8) ((PciSegmentRead8 (Address) & AndData) | OrData));
}
/**
Reads a bit field of a PCI configuration register.
Reads the bit field in an 8-bit PCI configuration register. The bit field is
specified by the StartBit and the EndBit. The value of the bit field is
returned.
If any reserved bits in Address are set, then ASSERT().
If StartBit is greater than 7, then ASSERT().
If EndBit is greater than 7, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
@param Address PCI configuration register to read.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..7.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..7.
@return The value of the bit field read from the PCI configuration register.
**/
UINT8
EFIAPI
PciSegmentBitFieldRead8 (
IN UINT64 Address,
IN UINTN StartBit,
IN UINTN EndBit
)
{
return BitFieldRead8 (PciSegmentRead8 (Address), StartBit, EndBit);
}
/**
Writes a bit field to a PCI configuration register.
Writes Value to the bit field of the PCI configuration register. The bit
field is specified by the StartBit and the EndBit. All other bits in the
destination PCI configuration register are preserved. The new value of the
8-bit register is returned.
If any reserved bits in Address are set, then ASSERT().
If StartBit is greater than 7, then ASSERT().
If EndBit is greater than 7, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If Value is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Address PCI configuration register to write.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..7.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..7.
@param Value New value of the bit field.
@return The value written back to the PCI configuration register.
**/
UINT8
EFIAPI
PciSegmentBitFieldWrite8 (
IN UINT64 Address,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT8 Value
)
{
return PciSegmentWrite8 (
Address,
BitFieldWrite8 (PciSegmentRead8 (Address), StartBit, EndBit, Value)
);
}
/**
Reads a bit field in an 8-bit PCI configuration, performs a bitwise OR, and
writes the result back to the bit field in the 8-bit port.
Reads the 8-bit PCI configuration register specified by Address, performs a
bitwise OR between the read result and the value specified by
OrData, and writes the result to the 8-bit PCI configuration register
specified by Address. The value written to the PCI configuration register is
returned. This function must guarantee that all PCI read and write operations
are serialized. Extra left bits in OrData are stripped.
If any reserved bits in Address are set, then ASSERT().
If StartBit is greater than 7, then ASSERT().
If EndBit is greater than 7, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Address PCI configuration register to write.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..7.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..7.
@param OrData The value to OR with the PCI configuration register.
@return The value written back to the PCI configuration register.
**/
UINT8
EFIAPI
PciSegmentBitFieldOr8 (
IN UINT64 Address,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT8 OrData
)
{
return PciSegmentWrite8 (
Address,
BitFieldOr8 (PciSegmentRead8 (Address), StartBit, EndBit, OrData)
);
}
/**
Reads a bit field in an 8-bit PCI configuration register, performs a bitwise
AND, and writes the result back to the bit field in the 8-bit register.
Reads the 8-bit PCI configuration register specified by Address, performs a
bitwise AND between the read result and the value specified by AndData, and
writes the result to the 8-bit PCI configuration register specified by
Address. The value written to the PCI configuration register is returned.
This function must guarantee that all PCI read and write operations are
serialized. Extra left bits in AndData are stripped.
If any reserved bits in Address are set, then ASSERT().
If StartBit is greater than 7, then ASSERT().
If EndBit is greater than 7, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Address PCI configuration register to write.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..7.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..7.
@param AndData The value to AND with the PCI configuration register.
@return The value written back to the PCI configuration register.
**/
UINT8
EFIAPI
PciSegmentBitFieldAnd8 (
IN UINT64 Address,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT8 AndData
)
{
return PciSegmentWrite8 (
Address,
BitFieldAnd8 (PciSegmentRead8 (Address), StartBit, EndBit, AndData)
);
}
/**
Reads a bit field in an 8-bit port, performs a bitwise AND followed by a
bitwise OR, and writes the result back to the bit field in the 8-bit port.
Reads the 8-bit PCI configuration register specified by Address, performs a
bitwise AND followed by a bitwise OR between the read result and
the value specified by AndData, and writes the result to the 8-bit PCI
configuration register specified by Address. The value written to the PCI
configuration register is returned. This function must guarantee that all PCI
read and write operations are serialized. Extra left bits in both AndData and
OrData are stripped.
If any reserved bits in Address are set, then ASSERT().
If StartBit is greater than 7, then ASSERT().
If EndBit is greater than 7, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Address PCI configuration register to write.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..7.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..7.
@param AndData The value to AND with the PCI configuration register.
@param OrData The value to OR with the result of the AND operation.
@return The value written back to the PCI configuration register.
**/
UINT8
EFIAPI
PciSegmentBitFieldAndThenOr8 (
IN UINT64 Address,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT8 AndData,
IN UINT8 OrData
)
{
return PciSegmentWrite8 (
Address,
BitFieldAndThenOr8 (PciSegmentRead8 (Address), StartBit, EndBit, AndData, OrData)
);
}
/**
Reads a 16-bit PCI configuration register.
Reads and returns the 16-bit PCI configuration register specified by Address.
This function must guarantee that all PCI read and write operations are serialized.
If any reserved bits in Address are set, then ASSERT().
If Address is not aligned on a 16-bit boundary, then ASSERT().
@param Address Address that encodes the PCI Segment, Bus, Device, Function, and Register.
@return The 16-bit PCI configuration register specified by Address.
**/
UINT16
EFIAPI
PciSegmentRead16 (
IN UINT64 Address
)
{
ASSERT_INVALID_PCI_SEGMENT_ADDRESS (Address, 1);
return (UINT16) DxePciSegmentLibPciRootBridgeIoReadWorker (Address, EfiPciWidthUint16);
}
/**
Writes a 16-bit PCI configuration register.
Writes the 16-bit PCI configuration register specified by Address with the value specified by Value.
Value is returned. This function must guarantee that all PCI read and write operations are serialized.
If any reserved bits in Address are set, then ASSERT().
If Address is not aligned on a 16-bit boundary, then ASSERT().
@param Address Address that encodes the PCI Segment, Bus, Device, Function, and Register.
@param Value The value to write.
@return The parameter of Value.
**/
UINT16
EFIAPI
PciSegmentWrite16 (
IN UINT64 Address,
IN UINT16 Value
)
{
ASSERT_INVALID_PCI_SEGMENT_ADDRESS (Address, 1);
return (UINT16) DxePciSegmentLibPciRootBridgeIoWriteWorker (Address, EfiPciWidthUint16, Value);
}
/**
Performs a bitwise OR of a 16-bit PCI configuration register with
a 16-bit value.
Reads the 16-bit PCI configuration register specified by Address, performs a
bitwise OR between the read result and the value specified by OrData, and
writes the result to the 16-bit PCI configuration register specified by Address.
The value written to the PCI configuration register is returned. This function
must guarantee that all PCI read and write operations are serialized.
If any reserved bits in Address are set, then ASSERT().
If Address is not aligned on a 16-bit boundary, then ASSERT().
@param Address Address that encodes the PCI Segment, Bus, Device, Function and
Register.
@param OrData The value to OR with the PCI configuration register.
@return The value written back to the PCI configuration register.
**/
UINT16
EFIAPI
PciSegmentOr16 (
IN UINT64 Address,
IN UINT16 OrData
)
{
return PciSegmentWrite16 (Address, (UINT16) (PciSegmentRead16 (Address) | OrData));
}
/**
Performs a bitwise AND of a 16-bit PCI configuration register with a 16-bit value.
Reads the 16-bit PCI configuration register specified by Address,
performs a bitwise AND between the read result and the value specified by AndData,
and writes the result to the 16-bit PCI configuration register specified by Address.
The value written to the PCI configuration register is returned.
This function must guarantee that all PCI read and write operations are serialized.
If any reserved bits in Address are set, then ASSERT().
If Address is not aligned on a 16-bit boundary, then ASSERT().
@param Address Address that encodes the PCI Segment, Bus, Device, Function, and Register.
@param AndData The value to AND with the PCI configuration register.
@return The value written to the PCI configuration register.
**/
UINT16
EFIAPI
PciSegmentAnd16 (
IN UINT64 Address,
IN UINT16 AndData
)
{
return PciSegmentWrite16 (Address, (UINT16) (PciSegmentRead16 (Address) & AndData));
}
/**
Performs a bitwise AND of a 16-bit PCI configuration register with a 16-bit value,
followed a bitwise OR with another 16-bit value.
Reads the 16-bit PCI configuration register specified by Address,
performs a bitwise AND between the read result and the value specified by AndData,
performs a bitwise OR between the result of the AND operation and the value specified by OrData,
and writes the result to the 16-bit PCI configuration register specified by Address.
The value written to the PCI configuration register is returned.
This function must guarantee that all PCI read and write operations are serialized.
If any reserved bits in Address are set, then ASSERT().
If Address is not aligned on a 16-bit boundary, then ASSERT().
@param Address Address that encodes the PCI Segment, Bus, Device, Function, and Register.
@param AndData The value to AND with the PCI configuration register.
@param OrData The value to OR with the PCI configuration register.
@return The value written to the PCI configuration register.
**/
UINT16
EFIAPI
PciSegmentAndThenOr16 (
IN UINT64 Address,
IN UINT16 AndData,
IN UINT16 OrData
)
{
return PciSegmentWrite16 (Address, (UINT16) ((PciSegmentRead16 (Address) & AndData) | OrData));
}
/**
Reads a bit field of a PCI configuration register.
Reads the bit field in a 16-bit PCI configuration register. The bit field is
specified by the StartBit and the EndBit. The value of the bit field is
returned.
If any reserved bits in Address are set, then ASSERT().
If Address is not aligned on a 16-bit boundary, then ASSERT().
If StartBit is greater than 15, then ASSERT().
If EndBit is greater than 15, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
@param Address PCI configuration register to read.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..15.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..15.
@return The value of the bit field read from the PCI configuration register.
**/
UINT16
EFIAPI
PciSegmentBitFieldRead16 (
IN UINT64 Address,
IN UINTN StartBit,
IN UINTN EndBit
)
{
return BitFieldRead16 (PciSegmentRead16 (Address), StartBit, EndBit);
}
/**
Writes a bit field to a PCI configuration register.
Writes Value to the bit field of the PCI configuration register. The bit
field is specified by the StartBit and the EndBit. All other bits in the
destination PCI configuration register are preserved. The new value of the
16-bit register is returned.
If any reserved bits in Address are set, then ASSERT().
If Address is not aligned on a 16-bit boundary, then ASSERT().
If StartBit is greater than 15, then ASSERT().
If EndBit is greater than 15, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If Value is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Address PCI configuration register to write.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..15.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..15.
@param Value New value of the bit field.
@return The value written back to the PCI configuration register.
**/
UINT16
EFIAPI
PciSegmentBitFieldWrite16 (
IN UINT64 Address,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT16 Value
)
{
return PciSegmentWrite16 (
Address,
BitFieldWrite16 (PciSegmentRead16 (Address), StartBit, EndBit, Value)
);
}
/**
Reads a bit field in a 16-bit PCI configuration, performs a bitwise OR, writes
the result back to the bit field in the 16-bit port.
Reads the 16-bit PCI configuration register specified by Address, performs a
bitwise OR between the read result and the value specified by
OrData, and writes the result to the 16-bit PCI configuration register
specified by Address. The value written to the PCI configuration register is
returned. This function must guarantee that all PCI read and write operations
are serialized. Extra left bits in OrData are stripped.
If any reserved bits in Address are set, then ASSERT().
If Address is not aligned on a 16-bit boundary, then ASSERT().
If StartBit is greater than 15, then ASSERT().
If EndBit is greater than 15, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Address PCI configuration register to write.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..15.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..15.
@param OrData The value to OR with the PCI configuration register.
@return The value written back to the PCI configuration register.
**/
UINT16
EFIAPI
PciSegmentBitFieldOr16 (
IN UINT64 Address,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT16 OrData
)
{
return PciSegmentWrite16 (
Address,
BitFieldOr16 (PciSegmentRead16 (Address), StartBit, EndBit, OrData)
);
}
/**
Reads a bit field in a 16-bit PCI configuration register, performs a bitwise
AND, writes the result back to the bit field in the 16-bit register.
Reads the 16-bit PCI configuration register specified by Address, performs a
bitwise AND between the read result and the value specified by AndData, and
writes the result to the 16-bit PCI configuration register specified by
Address. The value written to the PCI configuration register is returned.
This function must guarantee that all PCI read and write operations are
serialized. Extra left bits in AndData are stripped.
If any reserved bits in Address are set, then ASSERT().
If Address is not aligned on a 16-bit boundary, then ASSERT().
If StartBit is greater than 15, then ASSERT().
If EndBit is greater than 15, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Address Address that encodes the PCI Segment, Bus, Device, Function, and Register.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..15.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..15.
@param AndData The value to AND with the PCI configuration register.
@return The value written back to the PCI configuration register.
**/
UINT16
EFIAPI
PciSegmentBitFieldAnd16 (
IN UINT64 Address,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT16 AndData
)
{
return PciSegmentWrite16 (
Address,
BitFieldAnd16 (PciSegmentRead16 (Address), StartBit, EndBit, AndData)
);
}
/**
Reads a bit field in a 16-bit port, performs a bitwise AND followed by a
bitwise OR, and writes the result back to the bit field in the
16-bit port.
Reads the 16-bit PCI configuration register specified by Address, performs a
bitwise AND followed by a bitwise OR between the read result and
the value specified by AndData, and writes the result to the 16-bit PCI
configuration register specified by Address. The value written to the PCI
configuration register is returned. This function must guarantee that all PCI
read and write operations are serialized. Extra left bits in both AndData and
OrData are stripped.
If any reserved bits in Address are set, then ASSERT().
If StartBit is greater than 15, then ASSERT().
If EndBit is greater than 15, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Address PCI configuration register to write.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..15.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..15.
@param AndData The value to AND with the PCI configuration register.
@param OrData The value to OR with the result of the AND operation.
@return The value written back to the PCI configuration register.
**/
UINT16
EFIAPI
PciSegmentBitFieldAndThenOr16 (
IN UINT64 Address,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT16 AndData,
IN UINT16 OrData
)
{
return PciSegmentWrite16 (
Address,
BitFieldAndThenOr16 (PciSegmentRead16 (Address), StartBit, EndBit, AndData, OrData)
);
}
/**
Reads a 32-bit PCI configuration register.
Reads and returns the 32-bit PCI configuration register specified by Address.
This function must guarantee that all PCI read and write operations are serialized.
If any reserved bits in Address are set, then ASSERT().
If Address is not aligned on a 32-bit boundary, then ASSERT().
@param Address Address that encodes the PCI Segment, Bus, Device, Function, and Register.
@return The 32-bit PCI configuration register specified by Address.
**/
UINT32
EFIAPI
PciSegmentRead32 (
IN UINT64 Address
)
{
ASSERT_INVALID_PCI_SEGMENT_ADDRESS (Address, 3);
return DxePciSegmentLibPciRootBridgeIoReadWorker (Address, EfiPciWidthUint32);
}
/**
Writes a 32-bit PCI configuration register.
Writes the 32-bit PCI configuration register specified by Address with the value specified by Value.
Value is returned. This function must guarantee that all PCI read and write operations are serialized.
If any reserved bits in Address are set, then ASSERT().
If Address is not aligned on a 32-bit boundary, then ASSERT().
@param Address Address that encodes the PCI Segment, Bus, Device, Function, and Register.
@param Value The value to write.
@return The parameter of Value.
**/
UINT32
EFIAPI
PciSegmentWrite32 (
IN UINT64 Address,
IN UINT32 Value
)
{
ASSERT_INVALID_PCI_SEGMENT_ADDRESS (Address, 3);
return DxePciSegmentLibPciRootBridgeIoWriteWorker (Address, EfiPciWidthUint32, Value);
}
/**
Performs a bitwise OR of a 32-bit PCI configuration register with a 32-bit value.
Reads the 32-bit PCI configuration register specified by Address,
performs a bitwise OR between the read result and the value specified by OrData,
and writes the result to the 32-bit PCI configuration register specified by Address.
The value written to the PCI configuration register is returned.
This function must guarantee that all PCI read and write operations are serialized.
If any reserved bits in Address are set, then ASSERT().
If Address is not aligned on a 32-bit boundary, then ASSERT().
@param Address Address that encodes the PCI Segment, Bus, Device, Function, and Register.
@param OrData The value to OR with the PCI configuration register.
@return The value written to the PCI configuration register.
**/
UINT32
EFIAPI
PciSegmentOr32 (
IN UINT64 Address,
IN UINT32 OrData
)
{
return PciSegmentWrite32 (Address, PciSegmentRead32 (Address) | OrData);
}
/**
Performs a bitwise AND of a 32-bit PCI configuration register with a 32-bit value.
Reads the 32-bit PCI configuration register specified by Address,
performs a bitwise AND between the read result and the value specified by AndData,
and writes the result to the 32-bit PCI configuration register specified by Address.
The value written to the PCI configuration register is returned.
This function must guarantee that all PCI read and write operations are serialized.
If any reserved bits in Address are set, then ASSERT().
If Address is not aligned on a 32-bit boundary, then ASSERT().
@param Address Address that encodes the PCI Segment, Bus, Device, Function, and Register.
@param AndData The value to AND with the PCI configuration register.
@return The value written to the PCI configuration register.
**/
UINT32
EFIAPI
PciSegmentAnd32 (
IN UINT64 Address,
IN UINT32 AndData
)
{
return PciSegmentWrite32 (Address, PciSegmentRead32 (Address) & AndData);
}
/**
Performs a bitwise AND of a 32-bit PCI configuration register with a 32-bit value,
followed a bitwise OR with another 32-bit value.
Reads the 32-bit PCI configuration register specified by Address,
performs a bitwise AND between the read result and the value specified by AndData,
performs a bitwise OR between the result of the AND operation and the value specified by OrData,
and writes the result to the 32-bit PCI configuration register specified by Address.
The value written to the PCI configuration register is returned.
This function must guarantee that all PCI read and write operations are serialized.
If any reserved bits in Address are set, then ASSERT().
If Address is not aligned on a 32-bit boundary, then ASSERT().
@param Address Address that encodes the PCI Segment, Bus, Device, Function, and Register.
@param AndData The value to AND with the PCI configuration register.
@param OrData The value to OR with the PCI configuration register.
@return The value written to the PCI configuration register.
**/
UINT32
EFIAPI
PciSegmentAndThenOr32 (
IN UINT64 Address,
IN UINT32 AndData,
IN UINT32 OrData
)
{
return PciSegmentWrite32 (Address, (PciSegmentRead32 (Address) & AndData) | OrData);
}
/**
Reads a bit field of a PCI configuration register.
Reads the bit field in a 32-bit PCI configuration register. The bit field is
specified by the StartBit and the EndBit. The value of the bit field is
returned.
If any reserved bits in Address are set, then ASSERT().
If Address is not aligned on a 32-bit boundary, then ASSERT().
If StartBit is greater than 31, then ASSERT().
If EndBit is greater than 31, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
@param Address PCI configuration register to read.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..31.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..31.
@return The value of the bit field read from the PCI configuration register.
**/
UINT32
EFIAPI
PciSegmentBitFieldRead32 (
IN UINT64 Address,
IN UINTN StartBit,
IN UINTN EndBit
)
{
return BitFieldRead32 (PciSegmentRead32 (Address), StartBit, EndBit);
}
/**
Writes a bit field to a PCI configuration register.
Writes Value to the bit field of the PCI configuration register. The bit
field is specified by the StartBit and the EndBit. All other bits in the
destination PCI configuration register are preserved. The new value of the
32-bit register is returned.
If any reserved bits in Address are set, then ASSERT().
If Address is not aligned on a 32-bit boundary, then ASSERT().
If StartBit is greater than 31, then ASSERT().
If EndBit is greater than 31, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If Value is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Address PCI configuration register to write.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..31.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..31.
@param Value New value of the bit field.
@return The value written back to the PCI configuration register.
**/
UINT32
EFIAPI
PciSegmentBitFieldWrite32 (
IN UINT64 Address,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT32 Value
)
{
return PciSegmentWrite32 (
Address,
BitFieldWrite32 (PciSegmentRead32 (Address), StartBit, EndBit, Value)
);
}
/**
Reads a bit field in a 32-bit PCI configuration, performs a bitwise OR, and
writes the result back to the bit field in the 32-bit port.
Reads the 32-bit PCI configuration register specified by Address, performs a
bitwise OR between the read result and the value specified by
OrData, and writes the result to the 32-bit PCI configuration register
specified by Address. The value written to the PCI configuration register is
returned. This function must guarantee that all PCI read and write operations
are serialized. Extra left bits in OrData are stripped.
If any reserved bits in Address are set, then ASSERT().
If StartBit is greater than 31, then ASSERT().
If EndBit is greater than 31, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Address PCI configuration register to write.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..31.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..31.
@param OrData The value to OR with the PCI configuration register.
@return The value written back to the PCI configuration register.
**/
UINT32
EFIAPI
PciSegmentBitFieldOr32 (
IN UINT64 Address,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT32 OrData
)
{
return PciSegmentWrite32 (
Address,
BitFieldOr32 (PciSegmentRead32 (Address), StartBit, EndBit, OrData)
);
}
/**
Reads a bit field in a 32-bit PCI configuration register, performs a bitwise
AND, and writes the result back to the bit field in the 32-bit register.
Reads the 32-bit PCI configuration register specified by Address, performs a bitwise
AND between the read result and the value specified by AndData, and writes the result
to the 32-bit PCI configuration register specified by Address. The value written to
the PCI configuration register is returned. This function must guarantee that all PCI
read and write operations are serialized. Extra left bits in AndData are stripped.
If any reserved bits in Address are set, then ASSERT().
If Address is not aligned on a 32-bit boundary, then ASSERT().
If StartBit is greater than 31, then ASSERT().
If EndBit is greater than 31, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Address Address that encodes the PCI Segment, Bus, Device, Function, and Register.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..31.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..31.
@param AndData The value to AND with the PCI configuration register.
@return The value written back to the PCI configuration register.
**/
UINT32
EFIAPI
PciSegmentBitFieldAnd32 (
IN UINT64 Address,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT32 AndData
)
{
return PciSegmentWrite32 (
Address,
BitFieldAnd32 (PciSegmentRead32 (Address), StartBit, EndBit, AndData)
);
}
/**
Reads a bit field in a 32-bit port, performs a bitwise AND followed by a
bitwise OR, and writes the result back to the bit field in the
32-bit port.
Reads the 32-bit PCI configuration register specified by Address, performs a
bitwise AND followed by a bitwise OR between the read result and
the value specified by AndData, and writes the result to the 32-bit PCI
configuration register specified by Address. The value written to the PCI
configuration register is returned. This function must guarantee that all PCI
read and write operations are serialized. Extra left bits in both AndData and
OrData are stripped.
If any reserved bits in Address are set, then ASSERT().
If StartBit is greater than 31, then ASSERT().
If EndBit is greater than 31, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Address PCI configuration register to write.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..31.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..31.
@param AndData The value to AND with the PCI configuration register.
@param OrData The value to OR with the result of the AND operation.
@return The value written back to the PCI configuration register.
**/
UINT32
EFIAPI
PciSegmentBitFieldAndThenOr32 (
IN UINT64 Address,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT32 AndData,
IN UINT32 OrData
)
{
return PciSegmentWrite32 (
Address,
BitFieldAndThenOr32 (PciSegmentRead32 (Address), StartBit, EndBit, AndData, OrData)
);
}
/**
Reads a range of PCI configuration registers into a caller supplied buffer.
Reads the range of PCI configuration registers specified by StartAddress and
Size into the buffer specified by Buffer. This function only allows the PCI
configuration registers from a single PCI function to be read. Size is
returned. When possible 32-bit PCI configuration read cycles are used to read
from StartAdress to StartAddress + Size. Due to alignment restrictions, 8-bit
and 16-bit PCI configuration read cycles may be used at the beginning and the
end of the range.
If any reserved bits in StartAddress are set, then ASSERT().
If ((StartAddress & 0xFFF) + Size) > 0x1000, then ASSERT().
If Size > 0 and Buffer is NULL, then ASSERT().
@param StartAddress Starting address that encodes the PCI Segment, Bus, Device,
Function and Register.
@param Size Size in bytes of the transfer.
@param Buffer Pointer to a buffer receiving the data read.
@return Size
**/
UINTN
EFIAPI
PciSegmentReadBuffer (
IN UINT64 StartAddress,
IN UINTN Size,
OUT VOID *Buffer
)
{
UINTN ReturnValue;
ASSERT_INVALID_PCI_SEGMENT_ADDRESS (StartAddress, 0);
ASSERT (((StartAddress & 0xFFF) + Size) <= 0x1000);
if (Size == 0) {
return Size;
}
ASSERT (Buffer != NULL);
//
// Save Size for return
//
ReturnValue = Size;
if ((StartAddress & BIT0) != 0) {
//
// Read a byte if StartAddress is byte aligned
//
*(volatile UINT8 *)Buffer = PciSegmentRead8 (StartAddress);
StartAddress += sizeof (UINT8);
Size -= sizeof (UINT8);
Buffer = (UINT8*)Buffer + 1;
}
if (Size >= sizeof (UINT16) && (StartAddress & BIT1) != 0) {
//
// Read a word if StartAddress is word aligned
//
WriteUnaligned16 (Buffer, PciSegmentRead16 (StartAddress));
StartAddress += sizeof (UINT16);
Size -= sizeof (UINT16);
Buffer = (UINT16*)Buffer + 1;
}
while (Size >= sizeof (UINT32)) {
//
// Read as many double words as possible
//
WriteUnaligned32 (Buffer, PciSegmentRead32 (StartAddress));
StartAddress += sizeof (UINT32);
Size -= sizeof (UINT32);
Buffer = (UINT32*)Buffer + 1;
}
if (Size >= sizeof (UINT16)) {
//
// Read the last remaining word if exist
//
WriteUnaligned16 (Buffer, PciSegmentRead16 (StartAddress));
StartAddress += sizeof (UINT16);
Size -= sizeof (UINT16);
Buffer = (UINT16*)Buffer + 1;
}
if (Size >= sizeof (UINT8)) {
//
// Read the last remaining byte if exist
//
*(volatile UINT8 *)Buffer = PciSegmentRead8 (StartAddress);
}
return ReturnValue;
}
/**
Copies the data in a caller supplied buffer to a specified range of PCI
configuration space.
Writes the range of PCI configuration registers specified by StartAddress and
Size from the buffer specified by Buffer. This function only allows the PCI
configuration registers from a single PCI function to be written. Size is
returned. When possible 32-bit PCI configuration write cycles are used to
write from StartAdress to StartAddress + Size. Due to alignment restrictions,
8-bit and 16-bit PCI configuration write cycles may be used at the beginning
and the end of the range.
If any reserved bits in StartAddress are set, then ASSERT().
If ((StartAddress & 0xFFF) + Size) > 0x1000, then ASSERT().
If Size > 0 and Buffer is NULL, then ASSERT().
@param StartAddress Starting address that encodes the PCI Segment, Bus, Device,
Function and Register.
@param Size Size in bytes of the transfer.
@param Buffer Pointer to a buffer containing the data to write.
@return The parameter of Size.
**/
UINTN
EFIAPI
PciSegmentWriteBuffer (
IN UINT64 StartAddress,
IN UINTN Size,
IN VOID *Buffer
)
{
UINTN ReturnValue;
ASSERT_INVALID_PCI_SEGMENT_ADDRESS (StartAddress, 0);
ASSERT (((StartAddress & 0xFFF) + Size) <= 0x1000);
if (Size == 0) {
return 0;
}
ASSERT (Buffer != NULL);
//
// Save Size for return
//
ReturnValue = Size;
if ((StartAddress & BIT0) != 0) {
//
// Write a byte if StartAddress is byte aligned
//
PciSegmentWrite8 (StartAddress, *(UINT8*)Buffer);
StartAddress += sizeof (UINT8);
Size -= sizeof (UINT8);
Buffer = (UINT8*)Buffer + 1;
}
if (Size >= sizeof (UINT16) && (StartAddress & BIT1) != 0) {
//
// Write a word if StartAddress is word aligned
//
PciSegmentWrite16 (StartAddress, ReadUnaligned16 (Buffer));
StartAddress += sizeof (UINT16);
Size -= sizeof (UINT16);
Buffer = (UINT16*)Buffer + 1;
}
while (Size >= sizeof (UINT32)) {
//
// Write as many double words as possible
//
PciSegmentWrite32 (StartAddress, ReadUnaligned32 (Buffer));
StartAddress += sizeof (UINT32);
Size -= sizeof (UINT32);
Buffer = (UINT32*)Buffer + 1;
}
if (Size >= sizeof (UINT16)) {
//
// Write the last remaining word if exist
//
PciSegmentWrite16 (StartAddress, ReadUnaligned16 (Buffer));
StartAddress += sizeof (UINT16);
Size -= sizeof (UINT16);
Buffer = (UINT16*)Buffer + 1;
}
if (Size >= sizeof (UINT8)) {
//
// Write the last remaining byte if exist
//
PciSegmentWrite8 (StartAddress, *(UINT8*)Buffer);
}
return ReturnValue;
}
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