[mirror_edk2.git] / MdePkg / Library / PeiPciSegmentLibPciCfg2 / PciSegmentLib.c

/** @file\r
  PCI Segment Library implementation using PCI CFG2 PPI.\r
\r
  Copyright (c) 2007 - 2008, Intel Corporation All rights\r
  reserved. This program and the accompanying materials are\r
  licensed and made available under the terms and conditions of\r
  the BSD License which accompanies this distribution.  The full\r
  text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
  \r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#include <PiPei.h>\r
\r
#include <Ppi/PciCfg2.h>\r
\r
#include <Library/PciSegmentLib.h>\r
#include <Library/BaseLib.h>\r
#include <Library/PeiServicesTablePointerLib.h>\r
#include <Library/DebugLib.h>\r
#include <Library/PeiServicesLib.h>\r
\r
/**\r
  Assert the validity of a PCI Segment address.\r
  A valid PCI Segment address should not contain 1's in bits 31:28\r
\r
  @param  A The address to validate.\r
  @param  M Additional bits to assert to be zero.\r
\r
**/\r
#define ASSERT_INVALID_PCI_SEGMENT_ADDRESS(A,M) \\r
  ASSERT (((A) & (0xf0000000 | (M))) == 0)\r
\r
/**\r
  Translate PCI Lib address into format of PCI CFG2 PPI.\r
\r
  @param  A  Address that encodes the PCI Bus, Device, Function and\r
             Register.\r
\r
**/\r
#define PCI_TO_PCICFG2_ADDRESS(A) \\r
  ((((A) << 4) & 0xff000000) | (((A) >> 4) & 0x00000700) | (((A) << 1) & 0x001f0000) | (LShiftU64((A) & 0xfff, 32)))\r
\r
/**\r
  Gets PCI CFG2 PPI.\r
\r
  This internal function retrieves PCI CFG2 PPI from PPI database.\r
\r
  @param  Address       Address that encodes the PCI Segment, Bus, Device, Function and Register.\r
\r
  @return The pointer to PCI CFG2 PPI.\r
\r
**/\r
EFI_PEI_PCI_CFG2_PPI *\r
InternalGetPciCfg2Ppi (\r
  IN  UINT64                Address\r
  )\r
{\r
  EFI_STATUS                 Status;\r
  UINTN                      Instance;\r
  EFI_PEI_PCI_CFG2_PPI       *PciCfg2Ppi;\r
  UINT64                     SegmentNumber;\r
\r
  Instance      = 0;\r
  PciCfg2Ppi    = NULL;\r
  SegmentNumber = BitFieldRead64 (Address, 32, 63);\r
\r
  //\r
  // Loop through all instances of the PPI and match segment number\r
  //\r
  do {\r
    Status = PeiServicesLocatePpi(\r
               &gEfiPciCfg2PpiGuid,\r
               Instance,\r
               NULL,\r
               (VOID**) &PciCfg2Ppi\r
               );\r
    ASSERT_EFI_ERROR (Status);\r
    Instance++;\r
  } while (PciCfg2Ppi->Segment != SegmentNumber);\r
\r
  return PciCfg2Ppi;\r
}\r
\r
/**\r
  Internal worker function to read a PCI configuration register.\r
\r
  This function wraps EFI_PEI_PCI_CFG2_PPI.Read() service.\r
  It reads and returns the PCI configuration register specified by Address,\r
  the width of data is specified by Width.\r
\r
  @param  Address Address that encodes the PCI Bus, Device, Function and\r
                  Register.\r
  @param  Width   Width of data to read\r
\r
  @return The value read from the PCI configuration register.\r
\r
**/\r
UINT32\r
PeiPciSegmentLibPciCfg2ReadWorker (\r
  IN  UINT64                      Address,\r
  IN  EFI_PEI_PCI_CFG_PPI_WIDTH   Width\r
  )\r
{\r
  UINT32                       Data;\r
  CONST EFI_PEI_PCI_CFG2_PPI   *PciCfg2Ppi;\r
  UINT64                       PciCfg2Address;\r
\r
  PciCfg2Ppi = InternalGetPciCfg2Ppi (Address);\r
  PciCfg2Address = PCI_TO_PCICFG2_ADDRESS (Address);\r
  PciCfg2Ppi->Read (\r
                GetPeiServicesTablePointer (),\r
                PciCfg2Ppi,\r
                Width,\r
                PciCfg2Address,\r
                &Data\r
                );\r
\r
  return Data;\r
}\r
\r
/**\r
  Internal worker function to writes a PCI configuration register.\r
\r
  This function wraps EFI_PEI_PCI_CFG2_PPI.Write() service.\r
  It writes the PCI configuration register specified by Address with the\r
  value specified by Data. The width of data is specifed by Width.\r
  Data is returned.\r
\r
  @param  Address Address that encodes the PCI Bus, Device, Function and\r
                  Register.\r
  @param  Width   Width of data to write\r
  @param  Data    The value to write.\r
\r
  @return The value written to the PCI configuration register.\r
\r
**/\r
UINT32\r
PeiPciSegmentLibPciCfg2WriteWorker (\r
  IN  UINT64                      Address,\r
  IN  EFI_PEI_PCI_CFG_PPI_WIDTH   Width,\r
  IN  UINT32                      Data\r
  )\r
{\r
  CONST EFI_PEI_PCI_CFG2_PPI   *PciCfg2Ppi;\r
  UINT64                       PciCfg2Address;\r
\r
  PciCfg2Ppi = InternalGetPciCfg2Ppi (Address);\r
  PciCfg2Address = PCI_TO_PCICFG2_ADDRESS (Address);\r
  PciCfg2Ppi->Write (\r
                GetPeiServicesTablePointer (),\r
                PciCfg2Ppi,\r
                Width,\r
                PciCfg2Address,\r
                &Data\r
                );\r
\r
  return Data;\r
}\r
\r
/**\r
  Register a PCI device so PCI configuration registers may be accessed after \r
  SetVirtualAddressMap().\r
  \r
  If Address > 0x0FFFFFFF, then ASSERT().\r
\r
  @param  Address Address that encodes the PCI Bus, Device, Function and\r
                  Register.\r
  \r
  @retval RETURN_SUCCESS           The PCI device was registered for runtime access.\r
  @retval RETURN_UNSUPPORTED       An attempt was made to call this function \r
                                   after ExitBootServices().\r
  @retval RETURN_UNSUPPORTED       The resources required to access the PCI device\r
                                   at runtime could not be mapped.\r
  @retval RETURN_OUT_OF_RESOURCES  There are not enough resources available to\r
                                   complete the registration.\r
\r
**/\r
RETURN_STATUS\r
EFIAPI\r
PciSegmentRegisterForRuntimeAccess (\r
  IN UINTN  Address\r
  )\r
{\r
  return RETURN_UNSUPPORTED;\r
}\r
\r
/**\r
  Reads an 8-bit PCI configuration register.\r
\r
  Reads and returns the 8-bit PCI configuration register specified by Address.\r
  This function must guarantee that all PCI read and write operations are serialized.\r
  \r
  If any reserved bits in Address are set, then ASSERT().\r
  \r
  @param  Address   Address that encodes the PCI Segment, Bus, Device, Function, and Register.\r
\r
  @return The 8-bit PCI configuration register specified by Address.\r
\r
**/\r
UINT8\r
EFIAPI\r
PciSegmentRead8 (\r
  IN UINT64                    Address\r
  )\r
{\r
  ASSERT_INVALID_PCI_SEGMENT_ADDRESS (Address, 0);\r
\r
  return (UINT8) PeiPciSegmentLibPciCfg2ReadWorker (Address, EfiPeiPciCfgWidthUint8);\r
}\r
\r
/**\r
  Writes an 8-bit PCI configuration register.\r
\r
  Writes the 8-bit PCI configuration register specified by Address with the value specified by Value.\r
  Value is returned.  This function must guarantee that all PCI read and write operations are serialized.\r
  \r
  If Address > 0x0FFFFFFF, then ASSERT().\r
\r
  @param  Address     Address that encodes the PCI Segment, Bus, Device, Function, and Register.\r
  @param  Value       The value to write.\r
\r
  @return The value written to the PCI configuration register.\r
\r
**/\r
UINT8\r
EFIAPI\r
PciSegmentWrite8 (\r
  IN UINT64                    Address,\r
  IN UINT8                     Value\r
  )\r
{\r
  ASSERT_INVALID_PCI_SEGMENT_ADDRESS (Address, 0);\r
\r
  return (UINT8) PeiPciSegmentLibPciCfg2WriteWorker (Address, EfiPeiPciCfgWidthUint8, Value);\r
}\r
\r
/**\r
  Performs a bitwise OR of an 8-bit PCI configuration register with an 8-bit value.\r
\r
  Reads the 8-bit PCI configuration register specified by Address,\r
  performs a bitwise OR between the read result and the value specified by OrData,\r
  and writes the result to the 8-bit PCI configuration register specified by Address.\r
  The value written to the PCI configuration register is returned.\r
  This function must guarantee that all PCI read and write operations are serialized.\r
  \r
  If any reserved bits in Address are set, then ASSERT().\r
\r
  @param  Address   Address that encodes the PCI Segment, Bus, Device, Function, and Register.\r
  @param  OrData    The value to OR with the PCI configuration register.\r
\r
  @return The value written to the PCI configuration register.\r
\r
**/\r
UINT8\r
EFIAPI\r
PciSegmentOr8 (\r
  IN UINT64                    Address,\r
  IN UINT8                     OrData\r
  )\r
{\r
  return PciSegmentWrite8 (Address, (UINT8) (PciSegmentRead8 (Address) | OrData));\r
}\r
\r
/**\r
  Performs a bitwise AND of an 8-bit PCI configuration register with an 8-bit value.\r
\r
  Reads the 8-bit PCI configuration register specified by Address,\r
  performs a bitwise AND between the read result and the value specified by AndData,\r
  and writes the result to the 8-bit PCI configuration register specified by Address.\r
  The value written to the PCI configuration register is returned.\r
  This function must guarantee that all PCI read and write operations are serialized.\r
  If any reserved bits in Address are set, then ASSERT().\r
\r
  @param  Address   Address that encodes the PCI Segment, Bus, Device, Function, and Register.\r
  @param  AndData   The value to AND with the PCI configuration register.\r
\r
  @return The value written to the PCI configuration register.\r
\r
**/\r
UINT8\r
EFIAPI\r
PciSegmentAnd8 (\r
  IN UINT64                    Address,\r
  IN UINT8                     AndData\r
  )\r
{\r
  return PciSegmentWrite8 (Address, (UINT8) (PciSegmentRead8 (Address) & AndData));\r
}\r
\r
/**\r
  Performs a bitwise AND of an 8-bit PCI configuration register with an 8-bit value,\r
  followed a  bitwise OR with another 8-bit value.\r
  \r
  Reads the 8-bit PCI configuration register specified by Address,\r
  performs a bitwise AND between the read result and the value specified by AndData,\r
  performs a bitwise OR between the result of the AND operation and the value specified by OrData,\r
  and writes the result to the 8-bit PCI configuration register specified by Address.\r
  The value written to the PCI configuration register is returned.\r
  This function must guarantee that all PCI read and write operations are serialized.\r
  \r
  If any reserved bits in Address are set, then ASSERT().\r
\r
  @param  Address   Address that encodes the PCI Segment, Bus, Device, Function, and Register.\r
  @param  AndData    The value to AND with the PCI configuration register.\r
  @param  OrData    The value to OR with the PCI configuration register.\r
\r
  @return The value written to the PCI configuration register.\r
\r
**/\r
UINT8\r
EFIAPI\r
PciSegmentAndThenOr8 (\r
  IN UINT64                    Address,\r
  IN UINT8                     AndData,\r
  IN UINT8                     OrData\r
  )\r
{\r
  return PciSegmentWrite8 (Address, (UINT8) ((PciSegmentRead8 (Address) & AndData) | OrData));\r
}\r
\r
/**\r
  Reads a bit field of a PCI configuration register.\r
\r
  Reads the bit field in an 8-bit PCI configuration register. The bit field is\r
  specified by the StartBit and the EndBit. The value of the bit field is\r
  returned.\r
\r
  If any reserved bits in Address are set, then ASSERT().\r
  If StartBit is greater than 7, then ASSERT().\r
  If EndBit is greater than 7, then ASSERT().\r
  If EndBit is less than StartBit, then ASSERT().\r
\r
  @param  Address   PCI configuration register to read.\r
  @param  StartBit  The ordinal of the least significant bit in the bit field.\r
                    Range 0..7.\r
  @param  EndBit    The ordinal of the most significant bit in the bit field.\r
                    Range 0..7.\r
\r
  @return The value of the bit field read from the PCI configuration register.\r
\r
**/\r
UINT8\r
EFIAPI\r
PciSegmentBitFieldRead8 (\r
  IN UINT64                    Address,\r
  IN UINTN                     StartBit,\r
  IN UINTN                     EndBit\r
  )\r
{\r
  return BitFieldRead8 (PciSegmentRead8 (Address), StartBit, EndBit);\r
}\r
\r
/**\r
  Writes a bit field to a PCI configuration register.\r
\r
  Writes Value to the bit field of the PCI configuration register. The bit\r
  field is specified by the StartBit and the EndBit. All other bits in the\r
  destination PCI configuration register are preserved. The new value of the\r
  8-bit register is returned.\r
\r
  If any reserved bits in Address are set, then ASSERT().\r
  If StartBit is greater than 7, then ASSERT().\r
  If EndBit is greater than 7, then ASSERT().\r
  If EndBit is less than StartBit, then ASSERT().\r
\r
  @param  Address   PCI configuration register to write.\r
  @param  StartBit  The ordinal of the least significant bit in the bit field.\r
                    Range 0..7.\r
  @param  EndBit    The ordinal of the most significant bit in the bit field.\r
                    Range 0..7.\r
  @param  Value     New value of the bit field.\r
\r
  @return The value written back to the PCI configuration register.\r
\r
**/\r
UINT8\r
EFIAPI\r
PciSegmentBitFieldWrite8 (\r
  IN UINT64                    Address,\r
  IN UINTN                     StartBit,\r
  IN UINTN                     EndBit,\r
  IN UINT8                     Value\r
  )\r
{\r
  return PciSegmentWrite8 (\r
           Address,\r
           BitFieldWrite8 (PciSegmentRead8 (Address), StartBit, EndBit, Value)\r
           );\r
}\r
\r
/**\r
  Reads a bit field in an 8-bit PCI configuration, performs a bitwise OR, and\r
  writes the result back to the bit field in the 8-bit port.\r
\r
  Reads the 8-bit PCI configuration register specified by Address, performs a\r
  bitwise OR between the read result and the value specified by\r
  OrData, and writes the result to the 8-bit PCI configuration register\r
  specified by Address. The value written to the PCI configuration register is\r
  returned. This function must guarantee that all PCI read and write operations\r
  are serialized. Extra left bits in OrData are stripped.\r
\r
  If any reserved bits in Address are set, then ASSERT().\r
  If StartBit is greater than 7, then ASSERT().\r
  If EndBit is greater than 7, then ASSERT().\r
  If EndBit is less than StartBit, then ASSERT().\r
\r
  @param  Address   PCI configuration register to write.\r
  @param  StartBit  The ordinal of the least significant bit in the bit field.\r
                    Range 0..7.\r
  @param  EndBit    The ordinal of the most significant bit in the bit field.\r
                    Range 0..7.\r
  @param  OrData    The value to OR with the PCI configuration register.\r
\r
  @return The value written back to the PCI configuration register.\r
\r
**/\r
UINT8\r
EFIAPI\r
PciSegmentBitFieldOr8 (\r
  IN UINT64                    Address,\r
  IN UINTN                     StartBit,\r
  IN UINTN                     EndBit,\r
  IN UINT8                     OrData\r
  )\r
{\r
  return PciSegmentWrite8 (\r
           Address,\r
           BitFieldOr8 (PciSegmentRead8 (Address), StartBit, EndBit, OrData)\r
           );\r
}\r
\r
/**\r
  Reads a bit field in an 8-bit PCI configuration register, performs a bitwise\r
  AND, and writes the result back to the bit field in the 8-bit register.\r
\r
  Reads the 8-bit PCI configuration register specified by Address, performs a\r
  bitwise AND between the read result and the value specified by AndData, and\r
  writes the result to the 8-bit PCI configuration register specified by\r
  Address. The value written to the PCI configuration register is returned.\r
  This function must guarantee that all PCI read and write operations are\r
  serialized. Extra left bits in AndData are stripped.\r
\r
  If any reserved bits in Address are set, then ASSERT().\r
  If StartBit is greater than 7, then ASSERT().\r
  If EndBit is greater than 7, then ASSERT().\r
  If EndBit is less than StartBit, then ASSERT().\r
\r
  @param  Address   PCI configuration register to write.\r
  @param  StartBit  The ordinal of the least significant bit in the bit field.\r
                    Range 0..7.\r
  @param  EndBit    The ordinal of the most significant bit in the bit field.\r
                    Range 0..7.\r
  @param  AndData   The value to AND with the PCI configuration register.\r
\r
  @return The value written back to the PCI configuration register.\r
\r
**/\r
UINT8\r
EFIAPI\r
PciSegmentBitFieldAnd8 (\r
  IN UINT64                    Address,\r
  IN UINTN                     StartBit,\r
  IN UINTN                     EndBit,\r
  IN UINT8                     AndData\r
  )\r
{\r
  return PciSegmentWrite8 (\r
           Address,\r
           BitFieldAnd8 (PciSegmentRead8 (Address), StartBit, EndBit, AndData)\r
           );\r
}\r
\r
/**\r
  Reads a bit field in an 8-bit port, performs a bitwise AND followed by a\r
  bitwise OR, and writes the result back to the bit field in the\r
  8-bit port.\r
\r
  Reads the 8-bit PCI configuration register specified by Address, performs a\r
  bitwise AND followed by a bitwise OR between the read result and\r
  the value specified by AndData, and writes the result to the 8-bit PCI\r
  configuration register specified by Address. The value written to the PCI\r
  configuration register is returned. This function must guarantee that all PCI\r
  read and write operations are serialized. Extra left bits in both AndData and\r
  OrData are stripped.\r
\r
  If any reserved bits in Address are set, then ASSERT().\r
  If StartBit is greater than 7, then ASSERT().\r
  If EndBit is greater than 7, then ASSERT().\r
  If EndBit is less than StartBit, then ASSERT().\r
\r
  @param  Address   PCI configuration register to write.\r
  @param  StartBit  The ordinal of the least significant bit in the bit field.\r
                    Range 0..7.\r
  @param  EndBit    The ordinal of the most significant bit in the bit field.\r
                    Range 0..7.\r
  @param  AndData   The value to AND with the PCI configuration register.\r
  @param  OrData    The value to OR with the result of the AND operation.\r
\r
  @return The value written back to the PCI configuration register.\r
\r
**/\r
UINT8\r
EFIAPI\r
PciSegmentBitFieldAndThenOr8 (\r
  IN UINT64                    Address,\r
  IN UINTN                     StartBit,\r
  IN UINTN                     EndBit,\r
  IN UINT8                     AndData,\r
  IN UINT8                     OrData\r
  )\r
{\r
  return PciSegmentWrite8 (\r
           Address,\r
           BitFieldAndThenOr8 (PciSegmentRead8 (Address), StartBit, EndBit, AndData, OrData)\r
           );\r
}\r
\r
/**\r
  Reads a 16-bit PCI configuration register.\r
\r
  Reads and returns the 16-bit PCI configuration register specified by Address.\r
  This function must guarantee that all PCI read and write operations are serialized.\r
  \r
  If any reserved bits in Address are set, then ASSERT().\r
  If Address is not aligned on a 16-bit boundary, then ASSERT().\r
  \r
  @param  Address   Address that encodes the PCI Segment, Bus, Device, Function, and Register.\r
\r
  @return The 16-bit PCI configuration register specified by Address.\r
\r
**/\r
UINT16\r
EFIAPI\r
PciSegmentRead16 (\r
  IN UINT64                    Address\r
  )\r
{\r
  ASSERT_INVALID_PCI_SEGMENT_ADDRESS (Address, 1);\r
\r
  return (UINT16) PeiPciSegmentLibPciCfg2ReadWorker (Address, EfiPeiPciCfgWidthUint16);\r
}\r
\r
/**\r
  Writes a 16-bit PCI configuration register.\r
\r
  Writes the 16-bit PCI configuration register specified by Address with the value specified by Value.\r
  Value is returned.  This function must guarantee that all PCI read and write operations are serialized.\r
  \r
  If any reserved bits in Address are set, then ASSERT().\r
  If Address is not aligned on a 16-bit boundary, then ASSERT().\r
\r
  @param  Address     Address that encodes the PCI Segment, Bus, Device, Function, and Register.\r
  @param  Value       The value to write.\r
\r
  @return The parameter of Value.\r
\r
**/\r
UINT16\r
EFIAPI\r
PciSegmentWrite16 (\r
  IN UINT64                    Address,\r
  IN UINT16                    Value\r
  )\r
{\r
  ASSERT_INVALID_PCI_SEGMENT_ADDRESS (Address, 1);\r
\r
  return (UINT16) PeiPciSegmentLibPciCfg2WriteWorker (Address, EfiPeiPciCfgWidthUint16, Value);\r
}\r
\r
/**\r
  Performs a bitwise OR of a 16-bit PCI configuration register with\r
  a 16-bit value.\r
\r
  Reads the 16-bit PCI configuration register specified by Address, performs a\r
  bitwise OR between the read result and the value specified by\r
  OrData, and writes the result to the 16-bit PCI configuration register\r
  specified by Address. The value written to the PCI configuration register is\r
  returned. This function must guarantee that all PCI read and write operations\r
  are serialized.\r
\r
  If any reserved bits in Address are set, then ASSERT().\r
  If Address is not aligned on a 16-bit boundary, then ASSERT().\r
\r
  @param  Address Address that encodes the PCI Segment, Bus, Device, Function and\r
                  Register.\r
  @param  OrData  The value to OR with the PCI configuration register.\r
\r
  @return The value written back to the PCI configuration register.\r
\r
**/\r
UINT16\r
EFIAPI\r
PciSegmentOr16 (\r
  IN UINT64                    Address,\r
  IN UINT16                    OrData\r
  )\r
{\r
  return PciSegmentWrite16 (Address, (UINT16) (PciSegmentRead16 (Address) | OrData));\r
}\r
\r
/**\r
  Performs a bitwise AND of a 16-bit PCI configuration register with a 16-bit value.\r
\r
  Reads the 16-bit PCI configuration register specified by Address,\r
  performs a bitwise AND between the read result and the value specified by AndData,\r
  and writes the result to the 16-bit PCI configuration register specified by Address.\r
  The value written to the PCI configuration register is returned.\r
  This function must guarantee that all PCI read and write operations are serialized.\r
  \r
  If any reserved bits in Address are set, then ASSERT().\r
  If Address is not aligned on a 16-bit boundary, then ASSERT().\r
  \r
  @param  Address   Address that encodes the PCI Segment, Bus, Device, Function, and Register.\r
  @param  AndData   The value to AND with the PCI configuration register.\r
\r
  @return The value written to the PCI configuration register.\r
\r
**/\r
UINT16\r
EFIAPI\r
PciSegmentAnd16 (\r
  IN UINT64                    Address,\r
  IN UINT16                    AndData\r
  )\r
{\r
  return PciSegmentWrite16 (Address, (UINT16) (PciSegmentRead16 (Address) & AndData));\r
}\r
\r
/**\r
  Performs a bitwise AND of a 16-bit PCI configuration register with a 16-bit value,\r
  followed a  bitwise OR with another 16-bit value.\r
  \r
  Reads the 16-bit PCI configuration register specified by Address,\r
  performs a bitwise AND between the read result and the value specified by AndData,\r
  performs a bitwise OR between the result of the AND operation and the value specified by OrData,\r
  and writes the result to the 16-bit PCI configuration register specified by Address.\r
  The value written to the PCI configuration register is returned.\r
  This function must guarantee that all PCI read and write operations are serialized.\r
  \r
  If any reserved bits in Address are set, then ASSERT().\r
  If Address is not aligned on a 16-bit boundary, then ASSERT().\r
\r
  @param  Address   Address that encodes the PCI Segment, Bus, Device, Function, and Register.\r
  @param  AndData    The value to AND with the PCI configuration register.\r
  @param  OrData    The value to OR with the PCI configuration register.\r
\r
  @return The value written to the PCI configuration register.\r
\r
**/\r
UINT16\r
EFIAPI\r
PciSegmentAndThenOr16 (\r
  IN UINT64                    Address,\r
  IN UINT16                    AndData,\r
  IN UINT16                    OrData\r
  )\r
{\r
  return PciSegmentWrite16 (Address, (UINT16) ((PciSegmentRead16 (Address) & AndData) | OrData));\r
}\r
\r
/**\r
  Reads a bit field of a PCI configuration register.\r
\r
  Reads the bit field in a 16-bit PCI configuration register. The bit field is\r
  specified by the StartBit and the EndBit. The value of the bit field is\r
  returned.\r
\r
  If any reserved bits in Address are set, then ASSERT().\r
  If Address is not aligned on a 16-bit boundary, then ASSERT().\r
  If StartBit is greater than 15, then ASSERT().\r
  If EndBit is greater than 15, then ASSERT().\r
  If EndBit is less than StartBit, then ASSERT().\r
\r
  @param  Address   PCI configuration register to read.\r
  @param  StartBit  The ordinal of the least significant bit in the bit field.\r
                    Range 0..15.\r
  @param  EndBit    The ordinal of the most significant bit in the bit field.\r
                    Range 0..15.\r
\r
  @return The value of the bit field read from the PCI configuration register.\r
\r
**/\r
UINT16\r
EFIAPI\r
PciSegmentBitFieldRead16 (\r
  IN UINT64                    Address,\r
  IN UINTN                     StartBit,\r
  IN UINTN                     EndBit\r
  )\r
{\r
  return BitFieldRead16 (PciSegmentRead16 (Address), StartBit, EndBit);\r
}\r
\r
/**\r
  Writes a bit field to a PCI configuration register.\r
\r
  Writes Value to the bit field of the PCI configuration register. The bit\r
  field is specified by the StartBit and the EndBit. All other bits in the\r
  destination PCI configuration register are preserved. The new value of the\r
  16-bit register is returned.\r
\r
  If any reserved bits in Address are set, then ASSERT().\r
  If Address is not aligned on a 16-bit boundary, then ASSERT().\r
  If StartBit is greater than 15, then ASSERT().\r
  If EndBit is greater than 15, then ASSERT().\r
  If EndBit is less than StartBit, then ASSERT().\r
\r
  @param  Address   PCI configuration register to write.\r
  @param  StartBit  The ordinal of the least significant bit in the bit field.\r
                    Range 0..15.\r
  @param  EndBit    The ordinal of the most significant bit in the bit field.\r
                    Range 0..15.\r
  @param  Value     New value of the bit field.\r
\r
  @return The value written back to the PCI configuration register.\r
\r
**/\r
UINT16\r
EFIAPI\r
PciSegmentBitFieldWrite16 (\r
  IN UINT64                    Address,\r
  IN UINTN                     StartBit,\r
  IN UINTN                     EndBit,\r
  IN UINT16                    Value\r
  )\r
{\r
  return PciSegmentWrite16 (\r
           Address,\r
           BitFieldWrite16 (PciSegmentRead16 (Address), StartBit, EndBit, Value)\r
           );\r
}\r
\r
/**\r
  Reads the 16-bit PCI configuration register specified by Address,\r
  performs a bitwise OR between the read result and the value specified by OrData,\r
  and writes the result to the 16-bit PCI configuration register specified by Address. \r
\r
  If any reserved bits in Address are set, then ASSERT().\r
  If Address is not aligned on a 16-bit boundary, then ASSERT().\r
  If StartBit is greater than 15, then ASSERT().\r
  If EndBit is greater than 15, then ASSERT().\r
  If EndBit is less than StartBit, then ASSERT().\r
\r
  @param  Address   PCI configuration register to write.\r
  @param  StartBit  The ordinal of the least significant bit in the bit field.\r
                    Range 0..15.\r
  @param  EndBit    The ordinal of the most significant bit in the bit field.\r
                    Range 0..15.\r
  @param  OrData    The value to OR with the PCI configuration register.\r
\r
  @return The value written back to the PCI configuration register.\r
\r
**/\r
UINT16\r
EFIAPI\r
PciSegmentBitFieldOr16 (\r
  IN UINT64                    Address,\r
  IN UINTN                     StartBit,\r
  IN UINTN                     EndBit,\r
  IN UINT16                    OrData\r
  )\r
{\r
  return PciSegmentWrite16 (\r
           Address,\r
           BitFieldOr16 (PciSegmentRead16 (Address), StartBit, EndBit, OrData)\r
           );\r
}\r
\r
/**\r
  Reads a bit field in a 16-bit PCI configuration, performs a bitwise OR,\r
  and writes the result back to the bit field in the 16-bit port.\r
\r
  Reads the 16-bit PCI configuration register specified by Address,\r
  performs a bitwise OR between the read result and the value specified by OrData,\r
  and writes the result to the 16-bit PCI configuration register specified by Address.\r
  The value written to the PCI configuration register is returned.\r
  This function must guarantee that all PCI read and write operations are serialized.\r
  Extra left bits in OrData are stripped.\r
  \r
  If any reserved bits in Address are set, then ASSERT().\r
  If Address is not aligned on a 16-bit boundary, then ASSERT().\r
  If StartBit is greater than 7, then ASSERT().\r
  If EndBit is greater than 7, then ASSERT().\r
  If EndBit is less than StartBit, then ASSERT().\r
\r
  @param  Address   Address that encodes the PCI Segment, Bus, Device, Function, and Register.\r
  @param  StartBit  The ordinal of the least significant bit in the bit field.\r
                    The ordinal of the least significant bit in a byte is bit 0.\r
  @param  EndBit    The ordinal of the most significant bit in the bit field.\r
                    The ordinal of the most significant bit in a byte is bit 7.\r
  @param  AndData   The value to AND with the read value from the PCI configuration register.\r
\r
  @return The value written to the PCI configuration register.\r
\r
**/\r
UINT16\r
EFIAPI\r
PciSegmentBitFieldAnd16 (\r
  IN UINT64                    Address,\r
  IN UINTN                     StartBit,\r
  IN UINTN                     EndBit,\r
  IN UINT16                    AndData\r
  )\r
{\r
  return PciSegmentWrite16 (\r
           Address,\r
           BitFieldAnd16 (PciSegmentRead16 (Address), StartBit, EndBit, AndData)\r
           );\r
}\r
\r
/**\r
  Reads a bit field in a 16-bit port, performs a bitwise AND followed by a\r
  bitwise OR, and writes the result back to the bit field in the\r
  16-bit port.\r
\r
  Reads the 16-bit PCI configuration register specified by Address, performs a\r
  bitwise AND followed by a bitwise OR between the read result and\r
  the value specified by AndData, and writes the result to the 16-bit PCI\r
  configuration register specified by Address. The value written to the PCI\r
  configuration register is returned. This function must guarantee that all PCI\r
  read and write operations are serialized. Extra left bits in both AndData and\r
  OrData are stripped.\r
\r
  If any reserved bits in Address are set, then ASSERT().\r
  If StartBit is greater than 15, then ASSERT().\r
  If EndBit is greater than 15, then ASSERT().\r
  If EndBit is less than StartBit, then ASSERT().\r
\r
  @param  Address   PCI configuration register to write.\r
  @param  StartBit  The ordinal of the least significant bit in the bit field.\r
                    Range 0..15.\r
  @param  EndBit    The ordinal of the most significant bit in the bit field.\r
                    Range 0..15.\r
  @param  AndData   The value to AND with the PCI configuration register.\r
  @param  OrData    The value to OR with the result of the AND operation.\r
\r
  @return The value written back to the PCI configuration register.\r
\r
**/\r
UINT16\r
EFIAPI\r
PciSegmentBitFieldAndThenOr16 (\r
  IN UINT64                    Address,\r
  IN UINTN                     StartBit,\r
  IN UINTN                     EndBit,\r
  IN UINT16                    AndData,\r
  IN UINT16                    OrData\r
  )\r
{\r
  return PciSegmentWrite16 (\r
           Address,\r
           BitFieldAndThenOr16 (PciSegmentRead16 (Address), StartBit, EndBit, AndData, OrData)\r
           );\r
}\r
\r
/**\r
  Reads a 32-bit PCI configuration register.\r
\r
  Reads and returns the 32-bit PCI configuration register specified by Address.\r
  This function must guarantee that all PCI read and write operations are serialized.\r
  \r
  If any reserved bits in Address are set, then ASSERT().\r
  If Address is not aligned on a 32-bit boundary, then ASSERT().\r
\r
  @param  Address   Address that encodes the PCI Segment, Bus, Device, Function, and Register.\r
\r
  @return The 32-bit PCI configuration register specified by Address.\r
\r
**/\r
UINT32\r
EFIAPI\r
PciSegmentRead32 (\r
  IN UINT64                    Address\r
  )\r
{\r
  ASSERT_INVALID_PCI_SEGMENT_ADDRESS (Address, 3);\r
\r
  return PeiPciSegmentLibPciCfg2ReadWorker (Address, EfiPeiPciCfgWidthUint32);\r
}\r
\r
/**\r
  Writes a 32-bit PCI configuration register.\r
\r
  Writes the 32-bit PCI configuration register specified by Address with the value specified by Value.\r
  Value is returned.  This function must guarantee that all PCI read and write operations are serialized.\r
  \r
  If any reserved bits in Address are set, then ASSERT().\r
  If Address is not aligned on a 32-bit boundary, then ASSERT().\r
\r
  @param  Address     Address that encodes the PCI Segment, Bus, Device, Function, and Register.\r
  @param  Value       The value to write.\r
\r
  @return The parameter of Value.\r
\r
**/\r
UINT32\r
EFIAPI\r
PciSegmentWrite32 (\r
  IN UINT64                    Address,\r
  IN UINT32                    Value\r
  )\r
{\r
  ASSERT_INVALID_PCI_SEGMENT_ADDRESS (Address, 3);\r
\r
  return PeiPciSegmentLibPciCfg2WriteWorker (Address, EfiPeiPciCfgWidthUint32, Value);\r
}\r
\r
/**\r
  Performs a bitwise OR of a 32-bit PCI configuration register with a 32-bit value.\r
\r
  Reads the 32-bit PCI configuration register specified by Address,\r
  performs a bitwise OR between the read result and the value specified by OrData,\r
  and writes the result to the 32-bit PCI configuration register specified by Address.\r
  The value written to the PCI configuration register is returned.\r
  This function must guarantee that all PCI read and write operations are serialized.\r
  \r
  If any reserved bits in Address are set, then ASSERT().\r
  If Address is not aligned on a 32-bit boundary, then ASSERT().\r
\r
  @param  Address   Address that encodes the PCI Segment, Bus, Device, Function, and Register.\r
  @param  OrData    The value to OR with the PCI configuration register.\r
\r
  @return The value written to the PCI configuration register.\r
\r
**/\r
UINT32\r
EFIAPI\r
PciSegmentOr32 (\r
  IN UINT64                    Address,\r
  IN UINT32                    OrData\r
  )\r
{\r
  return PciSegmentWrite32 (Address, PciSegmentRead32 (Address) | OrData);\r
}\r
\r
/**\r
  Performs a bitwise AND of a 32-bit PCI configuration register with a 32-bit value.\r
\r
  Reads the 32-bit PCI configuration register specified by Address,\r
  performs a bitwise AND between the read result and the value specified by AndData,\r
  and writes the result to the 32-bit PCI configuration register specified by Address.\r
  The value written to the PCI configuration register is returned.\r
  This function must guarantee that all PCI read and write operations are serialized.\r
  \r
  If any reserved bits in Address are set, then ASSERT().\r
  If Address is not aligned on a 32-bit boundary, then ASSERT().\r
\r
  @param  Address   Address that encodes the PCI Segment, Bus, Device, Function, and Register.\r
  @param  AndData   The value to AND with the PCI configuration register.\r
\r
  @return The value written to the PCI configuration register.\r
\r
**/\r
UINT32\r
EFIAPI\r
PciSegmentAnd32 (\r
  IN UINT64                    Address,\r
  IN UINT32                    AndData\r
  )\r
{\r
  return PciSegmentWrite32 (Address, PciSegmentRead32 (Address) & AndData);\r
}\r
\r
/**\r
  Performs a bitwise AND of a 32-bit PCI configuration register with a 32-bit value,\r
  followed a  bitwise OR with another 32-bit value.\r
  \r
  Reads the 32-bit PCI configuration register specified by Address,\r
  performs a bitwise AND between the read result and the value specified by AndData,\r
  performs a bitwise OR between the result of the AND operation and the value specified by OrData,\r
  and writes the result to the 32-bit PCI configuration register specified by Address.\r
  The value written to the PCI configuration register is returned.\r
  This function must guarantee that all PCI read and write operations are serialized.\r
  \r
  If any reserved bits in Address are set, then ASSERT().\r
  If Address is not aligned on a 32-bit boundary, then ASSERT().\r
\r
  @param  Address   Address that encodes the PCI Segment, Bus, Device, Function, and Register.\r
  @param  AndData   The value to AND with the PCI configuration register.\r
  @param  OrData    The value to OR with the PCI configuration register.\r
\r
  @return The value written to the PCI configuration register.\r
\r
**/\r
UINT32\r
EFIAPI\r
PciSegmentAndThenOr32 (\r
  IN UINT64                    Address,\r
  IN UINT32                    AndData,\r
  IN UINT32                    OrData\r
  )\r
{\r
  return PciSegmentWrite32 (Address, (PciSegmentRead32 (Address) & AndData) | OrData);\r
}\r
\r
/**\r
  Reads a bit field of a PCI configuration register.\r
\r
  Reads the bit field in a 32-bit PCI configuration register. The bit field is\r
  specified by the StartBit and the EndBit. The value of the bit field is\r
  returned.\r
\r
  If any reserved bits in Address are set, then ASSERT().\r
  If Address is not aligned on a 32-bit boundary, then ASSERT().\r
  If StartBit is greater than 31, then ASSERT().\r
  If EndBit is greater than 31, then ASSERT().\r
  If EndBit is less than StartBit, then ASSERT().\r
\r
  @param  Address   PCI configuration register to read.\r
  @param  StartBit  The ordinal of the least significant bit in the bit field.\r
                    Range 0..31.\r
  @param  EndBit    The ordinal of the most significant bit in the bit field.\r
                    Range 0..31.\r
\r
  @return The value of the bit field read from the PCI configuration register.\r
\r
**/\r
UINT32\r
EFIAPI\r
PciSegmentBitFieldRead32 (\r
  IN UINT64                    Address,\r
  IN UINTN                     StartBit,\r
  IN UINTN                     EndBit\r
  )\r
{\r
  return BitFieldRead32 (PciSegmentRead32 (Address), StartBit, EndBit);\r
}\r
\r
/**\r
  Writes a bit field to a PCI configuration register.\r
\r
  Writes Value to the bit field of the PCI configuration register. The bit\r
  field is specified by the StartBit and the EndBit. All other bits in the\r
  destination PCI configuration register are preserved. The new value of the\r
  32-bit register is returned.\r
\r
  If any reserved bits in Address are set, then ASSERT().\r
  If Address is not aligned on a 32-bit boundary, then ASSERT().\r
  If StartBit is greater than 31, then ASSERT().\r
  If EndBit is greater than 31, then ASSERT().\r
  If EndBit is less than StartBit, then ASSERT().\r
\r
  @param  Address   PCI configuration register to write.\r
  @param  StartBit  The ordinal of the least significant bit in the bit field.\r
                    Range 0..31.\r
  @param  EndBit    The ordinal of the most significant bit in the bit field.\r
                    Range 0..31.\r
  @param  Value     New value of the bit field.\r
\r
  @return The value written back to the PCI configuration register.\r
\r
**/\r
UINT32\r
EFIAPI\r
PciSegmentBitFieldWrite32 (\r
  IN UINT64                    Address,\r
  IN UINTN                     StartBit,\r
  IN UINTN                     EndBit,\r
  IN UINT32                    Value\r
  )\r
{\r
  return PciSegmentWrite32 (\r
           Address,\r
           BitFieldWrite32 (PciSegmentRead32 (Address), StartBit, EndBit, Value)\r
           );\r
}\r
\r
/**\r
  Reads a bit field in a 32-bit PCI configuration, performs a bitwise OR, and\r
  writes the result back to the bit field in the 32-bit port.\r
\r
  Reads the 32-bit PCI configuration register specified by Address, performs a\r
  bitwise OR between the read result and the value specified by\r
  OrData, and writes the result to the 32-bit PCI configuration register\r
  specified by Address. The value written to the PCI configuration register is\r
  returned. This function must guarantee that all PCI read and write operations\r
  are serialized. Extra left bits in OrData are stripped.\r
\r
  If any reserved bits in Address are set, then ASSERT().\r
  If StartBit is greater than 31, then ASSERT().\r
  If EndBit is greater than 31, then ASSERT().\r
  If EndBit is less than StartBit, then ASSERT().\r
\r
  @param  Address   PCI configuration register to write.\r
  @param  StartBit  The ordinal of the least significant bit in the bit field.\r
                    Range 0..31.\r
  @param  EndBit    The ordinal of the most significant bit in the bit field.\r
                    Range 0..31.\r
  @param  OrData    The value to OR with the PCI configuration register.\r
\r
  @return The value written back to the PCI configuration register.\r
\r
**/\r
UINT32\r
EFIAPI\r
PciSegmentBitFieldOr32 (\r
  IN UINT64                    Address,\r
  IN UINTN                     StartBit,\r
  IN UINTN                     EndBit,\r
  IN UINT32                    OrData\r
  )\r
{\r
  return PciSegmentWrite32 (\r
           Address,\r
           BitFieldOr32 (PciSegmentRead32 (Address), StartBit, EndBit, OrData)\r
           );\r
}\r
\r
/**\r
  Reads a bit field in a 32-bit PCI configuration register, performs a bitwise\r
  AND, and writes the result back to the bit field in the 32-bit register.\r
\r
  \r
  Reads the 32-bit PCI configuration register specified by Address, performs a bitwise\r
  AND between the read result and the value specified by AndData, and writes the result\r
  to the 32-bit PCI configuration register specified by Address. The value written to\r
  the PCI configuration register is returned.  This function must guarantee that all PCI\r
  read and write operations are serialized.  Extra left bits in AndData are stripped.\r
  If any reserved bits in Address are set, then ASSERT().\r
  If Address is not aligned on a 32-bit boundary, then ASSERT().\r
  If StartBit is greater than 31, then ASSERT().\r
  If EndBit is greater than 31, then ASSERT().\r
  If EndBit is less than StartBit, then ASSERT().\r
  \r
\r
  @param  Address   PCI configuration register to write.\r
  @param  StartBit  The ordinal of the least significant bit in the bit field.\r
                    Range 0..31.\r
  @param  EndBit    The ordinal of the most significant bit in the bit field.\r
                    Range 0..31.\r
  @param  AndData   The value to AND with the PCI configuration register.\r
\r
  @return The value written back to the PCI configuration register.\r
\r
**/\r
UINT32\r
EFIAPI\r
PciSegmentBitFieldAnd32 (\r
  IN UINT64                    Address,\r
  IN UINTN                     StartBit,\r
  IN UINTN                     EndBit,\r
  IN UINT32                    AndData\r
  )\r
{\r
  return PciSegmentWrite32 (\r
           Address,\r
           BitFieldAnd32 (PciSegmentRead32 (Address), StartBit, EndBit, AndData)\r
           );\r
}\r
\r
/**\r
  Reads a bit field in a 32-bit port, performs a bitwise AND followed by a\r
  bitwise OR, and writes the result back to the bit field in the\r
  32-bit port.\r
\r
  Reads the 32-bit PCI configuration register specified by Address, performs a\r
  bitwise AND followed by a bitwise OR between the read result and\r
  the value specified by AndData, and writes the result to the 32-bit PCI\r
  configuration register specified by Address. The value written to the PCI\r
  configuration register is returned. This function must guarantee that all PCI\r
  read and write operations are serialized. Extra left bits in both AndData and\r
  OrData are stripped.\r
\r
  If any reserved bits in Address are set, then ASSERT().\r
  If StartBit is greater than 31, then ASSERT().\r
  If EndBit is greater than 31, then ASSERT().\r
  If EndBit is less than StartBit, then ASSERT().\r
\r
  @param  Address   PCI configuration register to write.\r
  @param  StartBit  The ordinal of the least significant bit in the bit field.\r
                    Range 0..31.\r
  @param  EndBit    The ordinal of the most significant bit in the bit field.\r
                    Range 0..31.\r
  @param  AndData   The value to AND with the PCI configuration register.\r
  @param  OrData    The value to OR with the result of the AND operation.\r
\r
  @return The value written back to the PCI configuration register.\r
\r
**/\r
UINT32\r
EFIAPI\r
PciSegmentBitFieldAndThenOr32 (\r
  IN UINT64                    Address,\r
  IN UINTN                     StartBit,\r
  IN UINTN                     EndBit,\r
  IN UINT32                    AndData,\r
  IN UINT32                    OrData\r
  )\r
{\r
  return PciSegmentWrite32 (\r
           Address,\r
           BitFieldAndThenOr32 (PciSegmentRead32 (Address), StartBit, EndBit, AndData, OrData)\r
           );\r
}\r
\r
/**\r
  Reads a range of PCI configuration registers into a caller supplied buffer.\r
\r
  Reads the range of PCI configuration registers specified by StartAddress and\r
  Size into the buffer specified by Buffer. This function only allows the PCI\r
  configuration registers from a single PCI function to be read. Size is\r
  returned. When possible 32-bit PCI configuration read cycles are used to read\r
  from StartAdress to StartAddress + Size. Due to alignment restrictions, 8-bit\r
  and 16-bit PCI configuration read cycles may be used at the beginning and the\r
  end of the range.\r
\r
  If StartAddress > 0x0FFFFFFF, then ASSERT().\r
  If ((StartAddress & 0xFFF) + Size) > 0x1000, then ASSERT().\r
  If Size > 0 and Buffer is NULL, then ASSERT().\r
\r
  @param  StartAddress  Starting address that encodes the PCI Segment, Bus, Device,\r
                        Function and Register.\r
  @param  Size          Size in bytes of the transfer.\r
  @param  Buffer        Pointer to a buffer receiving the data read.\r
\r
  @return Size\r
\r
**/\r
UINTN\r
EFIAPI\r
PciSegmentReadBuffer (\r
  IN  UINT64                   StartAddress,\r
  IN  UINTN                    Size,\r
  OUT VOID                     *Buffer\r
  )\r
{\r
  UINTN                             ReturnValue;\r
\r
  ASSERT_INVALID_PCI_SEGMENT_ADDRESS (StartAddress, 0);\r
  ASSERT (((StartAddress & 0xFFF) + Size) <= 0x1000);\r
\r
  if (Size == 0) {\r
    return Size;\r
  }\r
\r
  ASSERT (Buffer != NULL);\r
\r
  //\r
  // Save Size for return\r
  //\r
  ReturnValue = Size;\r
\r
  if ((StartAddress & BIT0) != 0) {\r
    //\r
    // Read a byte if StartAddress is byte aligned\r
    //\r
    *(volatile UINT8 *)Buffer = PciSegmentRead8 (StartAddress);\r
    StartAddress += sizeof (UINT8);\r
    Size -= sizeof (UINT8);\r
    Buffer = (UINT8*)Buffer + 1;\r
  }\r
\r
  if (Size >= sizeof (UINT16) && (StartAddress & BIT1) != 0) {\r
    //\r
    // Read a word if StartAddress is word aligned\r
    //\r
    *(volatile UINT16 *)Buffer = PciSegmentRead16 (StartAddress);\r
    StartAddress += sizeof (UINT16);\r
    Size -= sizeof (UINT16);\r
    Buffer = (UINT16*)Buffer + 1;\r
  }\r
\r
  while (Size >= sizeof (UINT32)) {\r
    //\r
    // Read as many double words as possible\r
    //\r
    *(volatile UINT32 *)Buffer = PciSegmentRead32 (StartAddress);\r
    StartAddress += sizeof (UINT32);\r
    Size -= sizeof (UINT32);\r
    Buffer = (UINT32*)Buffer + 1;\r
  }\r
\r
  if (Size >= sizeof (UINT16)) {\r
    //\r
    // Read the last remaining word if exist\r
    //\r
    *(volatile UINT16 *)Buffer = PciSegmentRead16 (StartAddress);\r
    StartAddress += sizeof (UINT16);\r
    Size -= sizeof (UINT16);\r
    Buffer = (UINT16*)Buffer + 1;\r
  }\r
\r
  if (Size >= sizeof (UINT8)) {\r
    //\r
    // Read the last remaining byte if exist\r
    //\r
    *(volatile UINT8 *)Buffer = PciSegmentRead8 (StartAddress);\r
  }\r
\r
  return ReturnValue;\r
}\r
\r
\r
/**\r
  Copies the data in a caller supplied buffer to a specified range of PCI\r
  configuration space.\r
\r
  Writes the range of PCI configuration registers specified by StartAddress and\r
  Size from the buffer specified by Buffer. This function only allows the PCI\r
  configuration registers from a single PCI function to be written. Size is\r
  returned. When possible 32-bit PCI configuration write cycles are used to\r
  write from StartAdress to StartAddress + Size. Due to alignment restrictions,\r
  8-bit and 16-bit PCI configuration write cycles may be used at the beginning\r
  and the end of the range.\r
\r
  If StartAddress > 0x0FFFFFFF, then ASSERT().\r
  If ((StartAddress & 0xFFF) + Size) > 0x1000, then ASSERT().\r
  If Size > 0 and Buffer is NULL, then ASSERT().\r
\r
  @param  StartAddress  Starting address that encodes the PCI Segment, Bus, Device,\r
                        Function and Register.\r
  @param  Size          Size in bytes of the transfer.\r
  @param  Buffer        Pointer to a buffer containing the data to write.\r
\r
  @return The parameter of Size.\r
\r
**/\r
UINTN\r
EFIAPI\r
PciSegmentWriteBuffer (\r
  IN UINT64                    StartAddress,\r
  IN UINTN                     Size,\r
  IN VOID                      *Buffer\r
  )\r
{\r
  UINTN                             ReturnValue;\r
\r
  ASSERT_INVALID_PCI_SEGMENT_ADDRESS (StartAddress, 0);\r
  ASSERT (((StartAddress & 0xFFF) + Size) <= 0x1000);\r
\r
  if (Size == 0) {\r
    return 0;\r
  }\r
\r
  ASSERT (Buffer != NULL);\r
\r
  //\r
  // Save Size for return\r
  //\r
  ReturnValue = Size;\r
\r
  if ((StartAddress & BIT0) != 0) {\r
    //\r
    // Write a byte if StartAddress is byte aligned\r
    //\r
    PciSegmentWrite8 (StartAddress, *(UINT8*)Buffer);\r
    StartAddress += sizeof (UINT8);\r
    Size -= sizeof (UINT8);\r
    Buffer = (UINT8*)Buffer + 1;\r
  }\r
\r
  if (Size >= sizeof (UINT16) && (StartAddress & BIT1) != 0) {\r
    //\r
    // Write a word if StartAddress is word aligned\r
    //\r
    PciSegmentWrite16 (StartAddress, *(UINT16*)Buffer);\r
    StartAddress += sizeof (UINT16);\r
    Size -= sizeof (UINT16);\r
    Buffer = (UINT16*)Buffer + 1;\r
  }\r
\r
  while (Size >= sizeof (UINT32)) {\r
    //\r
    // Write as many double words as possible\r
    //\r
    PciSegmentWrite32 (StartAddress, *(UINT32*)Buffer);\r
    StartAddress += sizeof (UINT32);\r
    Size -= sizeof (UINT32);\r
    Buffer = (UINT32*)Buffer + 1;\r
  }\r
\r
  if (Size >= sizeof (UINT16)) {\r
    //\r
    // Write the last remaining word if exist\r
    //\r
    PciSegmentWrite16 (StartAddress, *(UINT16*)Buffer);\r
    StartAddress += sizeof (UINT16);\r
    Size -= sizeof (UINT16);\r
    Buffer = (UINT16*)Buffer + 1;\r
  }\r
\r
  if (Size >= sizeof (UINT8)) {\r
    //\r
    // Write the last remaining byte if exist\r
    //\r
    PciSegmentWrite8 (StartAddress, *(UINT8*)Buffer);\r
  }\r
\r
  return ReturnValue;\r
}\r