MdePkg/Library/PciSegmentLibSegmentInfo/PciSegmentLibCommon.c

/** @file
  Provide common routines used by BasePciSegmentLibSegmentInfo and
  DxeRuntimePciSegmentLibSegmentInfo libraries.

  Copyright (c) 2017, 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 "PciSegmentLibCommon.h"

typedef struct {
  UINT64  Register : 12;
  UINT64  Function : 3;
  UINT64  Device : 5;
  UINT64  Bus : 8;
  UINT64  Reserved1 : 4;
  UINT64  Segment : 16;
  UINT64  Reserved2 : 16;
} PCI_SEGMENT_LIB_ADDRESS_STRUCTURE;

/**
  Internal function that converts PciSegmentLib format address that encodes the PCI Bus, Device,
  Function and Register to ECAM (Enhanced Configuration Access Mechanism) address.

  @param Address     The address that encodes the PCI Bus, Device, Function and
                     Register.
  @param SegmentInfo An array of PCI_SEGMENT_INFO holding the segment information.
  @param Count       Number of segments.

  @retval ECAM address.
**/
UINTN
PciSegmentLibGetEcamAddress (
  IN UINT64                    Address,
  IN CONST PCI_SEGMENT_INFO    *SegmentInfo,
  IN UINTN                     Count
  )
{
  while (Count != 0) {
    if (SegmentInfo->SegmentNumber == ((PCI_SEGMENT_LIB_ADDRESS_STRUCTURE *)&Address)->Segment) {
      break;
    }
    SegmentInfo++;
    Count--;
  }
  ASSERT (Count != 0);
  ASSERT (
    (((PCI_SEGMENT_LIB_ADDRESS_STRUCTURE *)&Address)->Reserved1 == 0) &&
    (((PCI_SEGMENT_LIB_ADDRESS_STRUCTURE *)&Address)->Reserved2 == 0)
  );
  ASSERT (((PCI_SEGMENT_LIB_ADDRESS_STRUCTURE *)&Address)->Bus >= SegmentInfo->StartBusNumber);
  ASSERT (((PCI_SEGMENT_LIB_ADDRESS_STRUCTURE *)&Address)->Bus <= SegmentInfo->EndBusNumber);

  Address = SegmentInfo->BaseAddress + PCI_ECAM_ADDRESS (
    ((PCI_SEGMENT_LIB_ADDRESS_STRUCTURE *)&Address)->Bus,
    ((PCI_SEGMENT_LIB_ADDRESS_STRUCTURE *)&Address)->Device,
    ((PCI_SEGMENT_LIB_ADDRESS_STRUCTURE *)&Address)->Function,
    ((PCI_SEGMENT_LIB_ADDRESS_STRUCTURE *)&Address)->Register);

  if (sizeof (UINTN) == sizeof (UINT32)) {
    ASSERT (Address < BASE_4GB);
  }

  return PciSegmentLibVirtualAddress ((UINTN)Address);
}

/**
  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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;

  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioRead8 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count));
}

/**
  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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;

  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioWrite8 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count), 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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;

  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioOr8 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count), 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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;

  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioAnd8 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count), 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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;

  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioAndThenOr8 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count), 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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;

  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioBitFieldRead8 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count), 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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;

  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioBitFieldWrite8 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count), 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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;

  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioBitFieldOr8 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count), 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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;

  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioBitFieldAnd8 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count), 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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;

  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioBitFieldAndThenOr8 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count), 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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;

  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioRead16 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count));
}

/**
  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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;

  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioWrite16 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count), 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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;

  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioOr16 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count), 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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;

  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioAnd16 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count), 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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;

  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioAndThenOr16 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count), 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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;

  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioBitFieldRead16 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count), 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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;

  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioBitFieldWrite16 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count), 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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;

  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioBitFieldOr16 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count), 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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;

  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioBitFieldAnd16 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count), 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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;
  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioBitFieldAndThenOr16 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count), 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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;

  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioRead32 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count));
}

/**
  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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;

  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioWrite32 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count), 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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;

  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioOr32 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count), 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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;

  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioAnd32 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count), 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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;

  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioAndThenOr32 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count), 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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;

  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioBitFieldRead32 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count), 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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;

  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioBitFieldWrite32 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count), 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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;

  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioBitFieldOr32 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count), 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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;

  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioBitFieldAnd32 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count), 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
  )
{
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;
  SegmentInfo = GetPciSegmentInfo (&Count);
  return MmioBitFieldAndThenOr32 (PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count), 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;
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;
  UINTN                        Address;

  ASSERT (((StartAddress & 0xFFF) + Size) <= 0x1000);

  SegmentInfo = GetPciSegmentInfo (&Count);
  Address = PciSegmentLibGetEcamAddress (StartAddress, SegmentInfo, Count);

  if (Size == 0) {
    return 0;
  }

  ASSERT (Buffer != NULL);

  //
  // Save Size for return
  //
  ReturnValue = Size;

  if ((Address & BIT0) != 0) {
    //
    // Read a byte if StartAddress is byte aligned
    //
    *(volatile UINT8 *)Buffer = MmioRead8 (Address);
    Address += sizeof (UINT8);
    Size -= sizeof (UINT8);
    Buffer = (UINT8*)Buffer + 1;
  }

  if (Size >= sizeof (UINT16) && (Address & BIT1) != 0) {
    //
    // Read a word if StartAddress is word aligned
    //
    WriteUnaligned16 (Buffer, MmioRead16 (Address));
    Address += sizeof (UINT16);
    Size -= sizeof (UINT16);
    Buffer = (UINT16*)Buffer + 1;
  }

  while (Size >= sizeof (UINT32)) {
    //
    // Read as many double words as possible
    //
    WriteUnaligned32 (Buffer, MmioRead32 (Address));
    Address += sizeof (UINT32);
    Size -= sizeof (UINT32);
    Buffer = (UINT32*)Buffer + 1;
  }

  if (Size >= sizeof (UINT16)) {
    //
    // Read the last remaining word if exist
    //
    WriteUnaligned16 (Buffer, MmioRead16 (Address));
    Address += sizeof (UINT16);
    Size -= sizeof (UINT16);
    Buffer = (UINT16*)Buffer + 1;
  }

  if (Size >= sizeof (UINT8)) {
    //
    // Read the last remaining byte if exist
    //
    *(volatile UINT8 *)Buffer = MmioRead8 (Address);
  }

  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;
  UINTN                        Count;
  PCI_SEGMENT_INFO             *SegmentInfo;
  UINTN                        Address;

  ASSERT (((StartAddress & 0xFFF) + Size) <= 0x1000);

  SegmentInfo = GetPciSegmentInfo (&Count);
  Address = PciSegmentLibGetEcamAddress (StartAddress, SegmentInfo, Count);

  if (Size == 0) {
    return 0;
  }

  ASSERT (Buffer != NULL);

  //
  // Save Size for return
  //
  ReturnValue = Size;

  if ((Address & BIT0) != 0) {
    //
    // Write a byte if StartAddress is byte aligned
    //
    MmioWrite8 (Address, *(UINT8*)Buffer);
    Address += sizeof (UINT8);
    Size -= sizeof (UINT8);
    Buffer = (UINT8*)Buffer + 1;
  }

  if (Size >= sizeof (UINT16) && (Address & BIT1) != 0) {
    //
    // Write a word if StartAddress is word aligned
    //
    MmioWrite16 (Address, ReadUnaligned16 (Buffer));
    Address += sizeof (UINT16);
    Size -= sizeof (UINT16);
    Buffer = (UINT16*)Buffer + 1;
  }

  while (Size >= sizeof (UINT32)) {
    //
    // Write as many double words as possible
    //
    MmioWrite32 (Address, ReadUnaligned32 (Buffer));
    Address += sizeof (UINT32);
    Size -= sizeof (UINT32);
    Buffer = (UINT32*)Buffer + 1;
  }

  if (Size >= sizeof (UINT16)) {
    //
    // Write the last remaining word if exist
    //
    MmioWrite16 (Address, ReadUnaligned16 (Buffer));
    Address += sizeof (UINT16);
    Size -= sizeof (UINT16);
    Buffer = (UINT16*)Buffer + 1;
  }

  if (Size >= sizeof (UINT8)) {
    //
    // Write the last remaining byte if exist
    //
    MmioWrite8 (Address, *(UINT8*)Buffer);
  }

  return ReturnValue;
}