source: vbox/trunk/src/VBox/Devices/EFI/FirmwareNew/MdePkg/Library/SmmPciExpressLib/PciExpressLib.c@ 99404

/** @file
 Functions in this library instance make use of MMIO functions in IoLib to
 access memory mapped PCI configuration space.

 All assertions for I/O operations are handled in MMIO functions in the IoLib
 Library.

 Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.
 Portions copyright (c) 2016, American Megatrends, Inc. All rights reserved.
 SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include <PiDxe.h>

#include <Library/BaseLib.h>
#include <Library/PciExpressLib.h>
#include <Library/IoLib.h>
#include <Library/DebugLib.h>
#include <Library/PcdLib.h>

///
/// Module global that contains the base physical address and size of the PCI Express MMIO range.
///
UINTN  mSmmPciExpressLibPciExpressBaseAddress = 0;
UINTN  mSmmPciExpressLibPciExpressBaseSize    = 0;

/**
 The constructor function caches the PCI Express Base Address

 @param ImageHandle The firmware allocated handle for the EFI image.
 @param SystemTable A pointer to the EFI System Table.

 @retval EFI_SUCCESS The constructor completed successfully.
**/
EFI_STATUS
EFIAPI
SmmPciExpressLibConstructor (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  //
  // Cache the physical address and size of the PCI Express MMIO range into a module global variable
  //
  mSmmPciExpressLibPciExpressBaseAddress = (UINTN)PcdGet64 (PcdPciExpressBaseAddress);
  mSmmPciExpressLibPciExpressBaseSize    = (UINTN)PcdGet64 (PcdPciExpressBaseSize);

  return EFI_SUCCESS;
}

/**
 Assert the validity of a PCI address. A valid PCI address should contain 1's
 only in the low 28 bits.

 @param A The address to validate.

**/
#define ASSERT_INVALID_PCI_ADDRESS(A) \
 ASSERT (((A) & ~0xfffffff) == 0)

/**
 Registers a PCI device so PCI configuration registers may be accessed after
 SetVirtualAddressMap().

 Registers the PCI device specified by Address so all the PCI configuration
 registers associated with that PCI device may be accessed after SetVirtualAddressMap()
 is called.

 If Address > 0x0FFFFFFF, then ASSERT().

 @param Address The 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
PciExpressRegisterForRuntimeAccess (
  IN UINTN  Address
  )
{
  ASSERT_INVALID_PCI_ADDRESS (Address);
  return RETURN_UNSUPPORTED;
}

/**
 Gets MMIO address that can be used to access PCI Express location defined by Address.

 This internal functions converts PCI Express address to a CPU MMIO address by adding
 PCI Express Base Address stored in a global variable mSmmPciExpressLibPciExpressBaseAddress.
 mSmmPciExpressLibPciExpressBaseAddress is initialized in the library constructor from PCD entry
 PcdPciExpressBaseAddress.

 If Address > 0x0FFFFFFF, then ASSERT().

 @param Address The address that encodes the PCI Bus, Device, Function and Register.

 @retval (UINTN)-1 Invalid PCI address.
 @retval other     MMIO address corresponding to Address.

**/
UINTN
GetPciExpressAddress (
  IN UINTN  Address
  )
{
  //
  // Make sure Address is valid
  //
  ASSERT_INVALID_PCI_ADDRESS (Address);
  //
  // Make sure the Address is in MMCONF address space
  //
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINTN)-1;
  }

  return mSmmPciExpressLibPciExpressBaseAddress + 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 Address > 0x0FFFFFFF, then ASSERT().

 @param Address The address that encodes the PCI Bus, Device, Function and
 Register.

 @retval 0xFF  Invalid PCI address.
 @retval other The read value from the PCI configuration register.

**/
UINT8
EFIAPI
PciExpressRead8 (
  IN UINTN  Address
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT8)-1;
  }

  return MmioRead8 (GetPciExpressAddress (Address));
}

/**
 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 Address > 0x0FFFFFFF, then ASSERT().

 @param Address The address that encodes the PCI Bus, Device, Function and
 Register.
 @param Value The value to write.

 @retval 0xFF  Invalid PCI address.
 @retval other The value written to the PCI configuration register.

**/
UINT8
EFIAPI
PciExpressWrite8 (
  IN UINTN  Address,
  IN UINT8  Value
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT8)-1;
  }

  return MmioWrite8 (GetPciExpressAddress (Address), 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 Address > 0x0FFFFFFF, then ASSERT().

 @param Address The address that encodes the PCI Bus, Device, Function and
 Register.
 @param OrData The value to OR with the PCI configuration register.

 @retval 0xFF  Invalid PCI address.
 @retval other The value written back to the PCI configuration register.

**/
UINT8
EFIAPI
PciExpressOr8 (
  IN UINTN  Address,
  IN UINT8  OrData
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT8)-1;
  }

  return MmioOr8 (GetPciExpressAddress (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 Address > 0x0FFFFFFF, then ASSERT().

 @param Address The address that encodes the PCI Bus, Device, Function and
 Register.
 @param AndData The value to AND with the PCI configuration register.

 @retval 0xFF  Invalid PCI address.
 @retval other The value written back to the PCI configuration register.

**/
UINT8
EFIAPI
PciExpressAnd8 (
  IN UINTN  Address,
  IN UINT8  AndData
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT8)-1;
  }

  return MmioAnd8 (GetPciExpressAddress (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 Address > 0x0FFFFFFF, then ASSERT().

 @param Address The address that encodes the PCI Bus, Device, Function and
 Register.
 @param AndData The value to AND with the PCI configuration register.
 @param OrData The value to OR with the result of the AND operation.

 @retval 0xFF  Invalid PCI address.
 @retval other The value written back to the PCI configuration register.

**/
UINT8
EFIAPI
PciExpressAndThenOr8 (
  IN UINTN  Address,
  IN UINT8  AndData,
  IN UINT8  OrData
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT8)-1;
  }

  return MmioAndThenOr8 (
           GetPciExpressAddress (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 Address > 0x0FFFFFFF, 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 The 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.

 @retval 0xFF  Invalid PCI address.
 @retval other The value of the bit field read from the PCI configuration register.

**/
UINT8
EFIAPI
PciExpressBitFieldRead8 (
  IN UINTN  Address,
  IN UINTN  StartBit,
  IN UINTN  EndBit
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT8)-1;
  }

  return MmioBitFieldRead8 (
           GetPciExpressAddress (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 Address > 0x0FFFFFFF, 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 The 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 The new value of the bit field.

 @retval 0xFF  Invalid PCI address.
 @retval other The value written back to the PCI configuration register.

**/
UINT8
EFIAPI
PciExpressBitFieldWrite8 (
  IN UINTN  Address,
  IN UINTN  StartBit,
  IN UINTN  EndBit,
  IN UINT8  Value
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT8)-1;
  }

  return MmioBitFieldWrite8 (
           GetPciExpressAddress (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 Address > 0x0FFFFFFF, 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 The 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.

 @retval 0xFF  Invalid PCI address.
 @retval other The value written back to the PCI configuration register.

**/
UINT8
EFIAPI
PciExpressBitFieldOr8 (
  IN UINTN  Address,
  IN UINTN  StartBit,
  IN UINTN  EndBit,
  IN UINT8  OrData
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT8)-1;
  }

  return MmioBitFieldOr8 (
           GetPciExpressAddress (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 Address > 0x0FFFFFFF, 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 The 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.

 @retval 0xFF  Invalid PCI address.
 @retval other The value written back to the PCI configuration register.

**/
UINT8
EFIAPI
PciExpressBitFieldAnd8 (
  IN UINTN  Address,
  IN UINTN  StartBit,
  IN UINTN  EndBit,
  IN UINT8  AndData
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT8)-1;
  }

  return MmioBitFieldAnd8 (
           GetPciExpressAddress (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 Address > 0x0FFFFFFF, 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 The 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.

 @retval 0xFF  Invalid PCI address.
 @retval other The value written back to the PCI configuration register.

**/
UINT8
EFIAPI
PciExpressBitFieldAndThenOr8 (
  IN UINTN  Address,
  IN UINTN  StartBit,
  IN UINTN  EndBit,
  IN UINT8  AndData,
  IN UINT8  OrData
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT8)-1;
  }

  return MmioBitFieldAndThenOr8 (
           GetPciExpressAddress (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 Address > 0x0FFFFFFF, then ASSERT().
 If Address is not aligned on a 16-bit boundary, then ASSERT().

 @param Address The address that encodes the PCI Bus, Device, Function and
 Register.

 @retval 0xFF  Invalid PCI address.
 @retval other The read value from the PCI configuration register.

**/
UINT16
EFIAPI
PciExpressRead16 (
  IN UINTN  Address
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT16)-1;
  }

  return MmioRead16 (GetPciExpressAddress (Address));
}

/**
 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 Address > 0x0FFFFFFF, then ASSERT().
 If Address is not aligned on a 16-bit boundary, then ASSERT().

 @param Address The address that encodes the PCI Bus, Device, Function and
 Register.
 @param Value The value to write.

 @retval 0xFFFF  Invalid PCI address.
 @retval other   The value written to the PCI configuration register.

**/
UINT16
EFIAPI
PciExpressWrite16 (
  IN UINTN   Address,
  IN UINT16  Value
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT16)-1;
  }

  return MmioWrite16 (GetPciExpressAddress (Address), 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 Address > 0x0FFFFFFF, then ASSERT().
 If Address is not aligned on a 16-bit boundary, then ASSERT().

 @param Address The address that encodes the PCI Bus, Device, Function and
 Register.
 @param OrData The value to OR with the PCI configuration register.

 @retval 0xFFFF  Invalid PCI address.
 @retval other   The value written back to the PCI configuration register.

**/
UINT16
EFIAPI
PciExpressOr16 (
  IN UINTN   Address,
  IN UINT16  OrData
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT16)-1;
  }

  return MmioOr16 (GetPciExpressAddress (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 Address > 0x0FFFFFFF, then ASSERT().
 If Address is not aligned on a 16-bit boundary, then ASSERT().

 @param Address The address that encodes the PCI Bus, Device, Function and
 Register.
 @param AndData The value to AND with the PCI configuration register.

 @retval 0xFFFF  Invalid PCI address.
 @retval other   The value written back to the PCI configuration register.

**/
UINT16
EFIAPI
PciExpressAnd16 (
  IN UINTN   Address,
  IN UINT16  AndData
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT16)-1;
  }

  return MmioAnd16 (GetPciExpressAddress (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 Address > 0x0FFFFFFF, then ASSERT().
 If Address is not aligned on a 16-bit boundary, then ASSERT().

 @param Address The address that encodes the PCI Bus, Device, Function and
 Register.
 @param AndData The value to AND with the PCI configuration register.
 @param OrData The value to OR with the result of the AND operation.

 @retval 0xFFFF  Invalid PCI address.
 @retval other   The value written back to the PCI configuration register.

**/
UINT16
EFIAPI
PciExpressAndThenOr16 (
  IN UINTN   Address,
  IN UINT16  AndData,
  IN UINT16  OrData
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT16)-1;
  }

  return MmioAndThenOr16 (
           GetPciExpressAddress (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 Address > 0x0FFFFFFF, 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 The 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.

 @retval 0xFFFF  Invalid PCI address.
 @retval other   The value of the bit field read from the PCI configuration register.

**/
UINT16
EFIAPI
PciExpressBitFieldRead16 (
  IN UINTN  Address,
  IN UINTN  StartBit,
  IN UINTN  EndBit
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT16)-1;
  }

  return MmioBitFieldRead16 (
           GetPciExpressAddress (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 Address > 0x0FFFFFFF, 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 The 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 The new value of the bit field.

 @retval 0xFFFF  Invalid PCI address.
 @retval other   The value written back to the PCI configuration register.

**/
UINT16
EFIAPI
PciExpressBitFieldWrite16 (
  IN UINTN   Address,
  IN UINTN   StartBit,
  IN UINTN   EndBit,
  IN UINT16  Value
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT16)-1;
  }

  return MmioBitFieldWrite16 (
           GetPciExpressAddress (Address),
           StartBit,
           EndBit,
           Value
           );
}

/**
 Reads a bit field in a 16-bit PCI configuration, performs 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 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 Address > 0x0FFFFFFF, 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 The 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.

 @retval 0xFFFF  Invalid PCI address.
 @retval other   The value written back to the PCI configuration register.

**/
UINT16
EFIAPI
PciExpressBitFieldOr16 (
  IN UINTN   Address,
  IN UINTN   StartBit,
  IN UINTN   EndBit,
  IN UINT16  OrData
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT16)-1;
  }

  return MmioBitFieldOr16 (
           GetPciExpressAddress (Address),
           StartBit,
           EndBit,
           OrData
           );
}

/**
 Reads a bit field in a 16-bit PCI configuration register, performs a bitwise
 AND, 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 Address > 0x0FFFFFFF, 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 The 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.

 @retval 0xFFFF  Invalid PCI address.
 @retval other   The value written back to the PCI configuration register.

**/
UINT16
EFIAPI
PciExpressBitFieldAnd16 (
  IN UINTN   Address,
  IN UINTN   StartBit,
  IN UINTN   EndBit,
  IN UINT16  AndData
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT16)-1;
  }

  return MmioBitFieldAnd16 (
           GetPciExpressAddress (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 Address > 0x0FFFFFFF, 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().
 If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().

 @param Address The 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.

 @retval 0xFFFF  Invalid PCI address.
 @retval other   The value written back to the PCI configuration register.

**/
UINT16
EFIAPI
PciExpressBitFieldAndThenOr16 (
  IN UINTN   Address,
  IN UINTN   StartBit,
  IN UINTN   EndBit,
  IN UINT16  AndData,
  IN UINT16  OrData
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT16)-1;
  }

  return MmioBitFieldAndThenOr16 (
           GetPciExpressAddress (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 Address > 0x0FFFFFFF, then ASSERT().
 If Address is not aligned on a 32-bit boundary, then ASSERT().

 @param Address The address that encodes the PCI Bus, Device, Function and
 Register.

 @retval 0xFFFFFFFF Invalid PCI address.
 @retval other      The read value from the PCI configuration register.

**/
UINT32
EFIAPI
PciExpressRead32 (
  IN UINTN  Address
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT32)-1;
  }

  return MmioRead32 (GetPciExpressAddress (Address));
}

/**
 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 Address > 0x0FFFFFFF, then ASSERT().
 If Address is not aligned on a 32-bit boundary, then ASSERT().

 @param Address The address that encodes the PCI Bus, Device, Function and
 Register.
 @param Value The value to write.

 @retval 0xFFFFFFFF Invalid PCI address.
 @retval other      The value written to the PCI configuration register.

**/
UINT32
EFIAPI
PciExpressWrite32 (
  IN UINTN   Address,
  IN UINT32  Value
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT32)-1;
  }

  return MmioWrite32 (GetPciExpressAddress (Address), 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 Address > 0x0FFFFFFF, then ASSERT().
 If Address is not aligned on a 32-bit boundary, then ASSERT().

 @param Address The address that encodes the PCI Bus, Device, Function and
 Register.
 @param OrData The value to OR with the PCI configuration register.

 @retval 0xFFFFFFFF Invalid PCI address.
 @retval other      The value written back to the PCI configuration register.

**/
UINT32
EFIAPI
PciExpressOr32 (
  IN UINTN   Address,
  IN UINT32  OrData
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT32)-1;
  }

  return MmioOr32 (GetPciExpressAddress (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 Address > 0x0FFFFFFF, then ASSERT().
 If Address is not aligned on a 32-bit boundary, then ASSERT().

 @param Address The address that encodes the PCI Bus, Device, Function and
 Register.
 @param AndData The value to AND with the PCI configuration register.

 @retval 0xFFFFFFFF Invalid PCI address.
 @retval other      The value written back to the PCI configuration register.

**/
UINT32
EFIAPI
PciExpressAnd32 (
  IN UINTN   Address,
  IN UINT32  AndData
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT32)-1;
  }

  return MmioAnd32 (GetPciExpressAddress (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 Address > 0x0FFFFFFF, then ASSERT().
 If Address is not aligned on a 32-bit boundary, then ASSERT().

 @param Address The address that encodes the PCI Bus, Device, Function and
 Register.
 @param AndData The value to AND with the PCI configuration register.
 @param OrData The value to OR with the result of the AND operation.

 @retval 0xFFFFFFFF Invalid PCI address.
 @retval other      The value written back to the PCI configuration register.

**/
UINT32
EFIAPI
PciExpressAndThenOr32 (
  IN UINTN   Address,
  IN UINT32  AndData,
  IN UINT32  OrData
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT32)-1;
  }

  return MmioAndThenOr32 (
           GetPciExpressAddress (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 Address > 0x0FFFFFFF, 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 The 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.

 @retval 0xFFFFFFFF Invalid PCI address.
 @retval other      The value of the bit field read from the PCI configuration register.

**/
UINT32
EFIAPI
PciExpressBitFieldRead32 (
  IN UINTN  Address,
  IN UINTN  StartBit,
  IN UINTN  EndBit
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT32)-1;
  }

  return MmioBitFieldRead32 (
           GetPciExpressAddress (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 Address > 0x0FFFFFFF, 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 The 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 The new value of the bit field.

 @retval 0xFFFFFFFF Invalid PCI address.
 @retval other      The value written back to the PCI configuration register.

**/
UINT32
EFIAPI
PciExpressBitFieldWrite32 (
  IN UINTN   Address,
  IN UINTN   StartBit,
  IN UINTN   EndBit,
  IN UINT32  Value
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT32)-1;
  }

  return MmioBitFieldWrite32 (
           GetPciExpressAddress (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 Address > 0x0FFFFFFF, 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 OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().

 @param Address The 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.

 @retval 0xFFFFFFFF Invalid PCI address.
 @retval other      The value written back to the PCI configuration register.

**/
UINT32
EFIAPI
PciExpressBitFieldOr32 (
  IN UINTN   Address,
  IN UINTN   StartBit,
  IN UINTN   EndBit,
  IN UINT32  OrData
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT32)-1;
  }

  return MmioBitFieldOr32 (
           GetPciExpressAddress (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 Address > 0x0FFFFFFF, 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 The 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.

 @retval 0xFFFFFFFF Invalid PCI address.
 @retval other      The value written back to the PCI configuration register.

**/
UINT32
EFIAPI
PciExpressBitFieldAnd32 (
  IN UINTN   Address,
  IN UINTN   StartBit,
  IN UINTN   EndBit,
  IN UINT32  AndData
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT32)-1;
  }

  return MmioBitFieldAnd32 (
           GetPciExpressAddress (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 Address > 0x0FFFFFFF, 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().
 If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().

 @param Address The 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.

 @retval 0xFFFFFFFF Invalid PCI address.
 @retval other      The value written back to the PCI configuration register.

**/
UINT32
EFIAPI
PciExpressBitFieldAndThenOr32 (
  IN UINTN   Address,
  IN UINTN   StartBit,
  IN UINTN   EndBit,
  IN UINT32  AndData,
  IN UINT32  OrData
  )
{
  if (Address >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINT32)-1;
  }

  return MmioBitFieldAndThenOr32 (
           GetPciExpressAddress (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 StartAddress 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 StartAddress > 0x0FFFFFFF, then ASSERT().
 If ((StartAddress & 0xFFF) + Size) > 0x1000, then ASSERT().
 If Size > 0 and Buffer is NULL, then ASSERT().

 @param StartAddress The starting address that encodes the PCI Bus, Device,
 Function and Register.
 @param Size The size in bytes of the transfer.
 @param Buffer The pointer to a buffer receiving the data read.

 @retval (UINTN)-1 Invalid PCI address.
 @retval other     Size read data from StartAddress.

**/
UINTN
EFIAPI
PciExpressReadBuffer (
  IN UINTN  StartAddress,
  IN UINTN  Size,
  OUT VOID  *Buffer
  )
{
  UINTN  ReturnValue;

  //
  // Make sure Address is valid
  //
  ASSERT_INVALID_PCI_ADDRESS (StartAddress);
  ASSERT (((StartAddress & 0xFFF) + Size) <= 0x1000);

  //
  // Make sure the Address is in MMCONF address space
  //
  if (StartAddress >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINTN)-1;
  }

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

  ASSERT (Buffer != NULL);

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

  if ((StartAddress & 1) != 0) {
    //
    // Read a byte if StartAddress is byte aligned
    //
    *(volatile UINT8 *)Buffer = PciExpressRead8 (StartAddress);
    StartAddress             += sizeof (UINT8);
    Size                     -= sizeof (UINT8);
    Buffer                    = (UINT8 *)Buffer + 1;
  }

  if ((Size >= sizeof (UINT16)) && ((StartAddress & 2) != 0)) {
    //
    // Read a word if StartAddress is word aligned
    //
    WriteUnaligned16 ((UINT16 *)Buffer, (UINT16)PciExpressRead16 (StartAddress));

    StartAddress += sizeof (UINT16);
    Size         -= sizeof (UINT16);
    Buffer        = (UINT16 *)Buffer + 1;
  }

  while (Size >= sizeof (UINT32)) {
    //
    // Read as many double words as possible
    //
    WriteUnaligned32 ((UINT32 *)Buffer, (UINT32)PciExpressRead32 (StartAddress));

    StartAddress += sizeof (UINT32);
    Size         -= sizeof (UINT32);
    Buffer        = (UINT32 *)Buffer + 1;
  }

  if (Size >= sizeof (UINT16)) {
    //
    // Read the last remaining word if exist
    //
    WriteUnaligned16 ((UINT16 *)Buffer, (UINT16)PciExpressRead16 (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 = PciExpressRead8 (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 StartAddress 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 StartAddress > 0x0FFFFFFF, then ASSERT().
 If ((StartAddress & 0xFFF) + Size) > 0x1000, then ASSERT().
 If Size > 0 and Buffer is NULL, then ASSERT().

 @param StartAddress The starting address that encodes the PCI Bus, Device,
 Function and Register.
 @param Size The size in bytes of the transfer.
 @param Buffer The pointer to a buffer containing the data to write.

 @retval (UINTN)-1 Invalid PCI address.
 @retval other     Size written to StartAddress.

**/
UINTN
EFIAPI
PciExpressWriteBuffer (
  IN UINTN  StartAddress,
  IN UINTN  Size,
  IN VOID   *Buffer
  )
{
  UINTN  ReturnValue;

  //
  // Make sure Address is valid
  //
  ASSERT_INVALID_PCI_ADDRESS (StartAddress);
  ASSERT (((StartAddress & 0xFFF) + Size) <= 0x1000);

  //
  // Make sure the Address is in MMCONF address space
  //
  if (StartAddress >= mSmmPciExpressLibPciExpressBaseSize) {
    return (UINTN)-1;
  }

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

  ASSERT (Buffer != NULL);

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

  if ((StartAddress & 1) != 0) {
    //
    // Write a byte if StartAddress is byte aligned
    //
    PciExpressWrite8 (StartAddress, *(UINT8 *)Buffer);
    StartAddress += sizeof (UINT8);
    Size         -= sizeof (UINT8);
    Buffer        = (UINT8 *)Buffer + 1;
  }

  if ((Size >= sizeof (UINT16)) && ((StartAddress & 2) != 0)) {
    //
    // Write a word if StartAddress is word aligned
    //
    PciExpressWrite16 (StartAddress, ReadUnaligned16 ((UINT16 *)Buffer));
    StartAddress += sizeof (UINT16);
    Size         -= sizeof (UINT16);
    Buffer        = (UINT16 *)Buffer + 1;
  }

  while (Size >= sizeof (UINT32)) {
    //
    // Write as many double words as possible
    //
    PciExpressWrite32 (StartAddress, ReadUnaligned32 ((UINT32 *)Buffer));
    StartAddress += sizeof (UINT32);
    Size         -= sizeof (UINT32);
    Buffer        = (UINT32 *)Buffer + 1;
  }

  if (Size >= sizeof (UINT16)) {
    //
    // Write the last remaining word if exist
    //
    PciExpressWrite16 (StartAddress, ReadUnaligned16 ((UINT16 *)Buffer));
    StartAddress += sizeof (UINT16);
    Size         -= sizeof (UINT16);
    Buffer        = (UINT16 *)Buffer + 1;
  }

  if (Size >= sizeof (UINT8)) {
    //
    // Write the last remaining byte if exist
    //
    PciExpressWrite8 (StartAddress, *(UINT8 *)Buffer);
  }

  return ReturnValue;
}