edkiiglueiolib.h

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  @param  Port      The I/O port to read.
  @param  StartBit  The ordinal of the least significant bit in the bit field.
                    Range 0..31.
  @param  EndBit    The ordinal of the most significant bit in the bit field.
                    Range 0..31.

  @return The value read.

**/
UINT32
EFIAPI
IoBitFieldRead32 (
  IN      UINTN                     Port,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit
  );

/**
  Writes a bit field to an I/O register.

  Writes Value to the bit field of the I/O register. The bit field is specified
  by the StartBit and the EndBit. All other bits in the destination I/O
  register are preserved. The value written to the I/O port is returned. Extra
  left bits in Value are stripped.

  If 32-bit I/O port operations are not supported, 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  Port      The I/O port to write.
  @param  StartBit  The ordinal of the least significant bit in the bit field.
                    Range 0..31.
  @param  EndBit    The ordinal of the most significant bit in the bit field.
                    Range 0..31.
  @param  Value     New value of the bit field.

  @return The value written back to the I/O port.

**/
UINT32
EFIAPI
IoBitFieldWrite32 (
  IN      UINTN                     Port,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT32                    Value
  );

/**
  Reads a bit field in a 32-bit port, performs a bitwise OR, and writes the
  result back to the bit field in the 32-bit port.

  Reads the 32-bit I/O port specified by Port, performs a bitwise inclusive OR
  between the read result and the value specified by OrData, and writes the
  result to the 32-bit I/O port specified by Port. The value written to the I/O
  port is returned. This function must guarantee that all I/O read and write
  operations are serialized. Extra left bits in OrData are stripped.

  If 32-bit I/O port operations are not supported, 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  Port      The I/O port 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 read value from the I/O port.

  @return The value written back to the I/O port.

**/
UINT32
EFIAPI
IoBitFieldOr32 (
  IN      UINTN                     Port,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT32                    OrData
  );

/**
  Reads a bit field in a 32-bit port, performs a bitwise AND, and writes the
  result back to the bit field in the 32-bit port.

  Reads the 32-bit I/O port specified by Port, performs a bitwise AND between
  the read result and the value specified by AndData, and writes the result to
  the 32-bit I/O port specified by Port. The value written to the I/O port is
  returned. This function must guarantee that all I/O read and write operations
  are serialized. Extra left bits in AndData are stripped.

  If 32-bit I/O port operations are not supported, 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  Port      The I/O port 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 read value from the I/O port.

  @return The value written back to the I/O port.

**/
UINT32
EFIAPI
IoBitFieldAnd32 (
  IN      UINTN                     Port,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT32                    AndData
  );

/**
  Reads a bit field in a 32-bit port, performs a bitwise AND followed by a
  bitwise inclusive OR, and writes the result back to the bit field in the
  32-bit port.

  Reads the 32-bit I/O port specified by Port, performs a bitwise AND followed
  by a bitwise inclusive OR between the read result and the value specified by
  AndData, and writes the result to the 32-bit I/O port specified by Port. The
  value written to the I/O port is returned. This function must guarantee that
  all I/O read and write operations are serialized. Extra left bits in both
  AndData and OrData are stripped.

  If 32-bit I/O port operations are not supported, 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  Port      The I/O port 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 read value from the I/O port.
  @param  OrData    The value to OR with the result of the AND operation.

  @return The value written back to the I/O port.

**/
UINT32
EFIAPI
IoBitFieldAndThenOr32 (
  IN      UINTN                     Port,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT32                    AndData,
  IN      UINT32                    OrData
  );

/**
  Reads a 64-bit I/O port.

  Reads the 64-bit I/O port specified by Port. The 64-bit read value is returned.
  This function must guarantee that all I/O read and write operations are
  serialized.

  If 64-bit I/O port operations are not supported, then ASSERT().

  @param  Port  The I/O port to read.

  @return The value read.

**/
UINT64
EFIAPI
IoRead64 (
  IN      UINTN                     Port
  );

/**
  Writes a 64-bit I/O port.

  Writes the 64-bit I/O port specified by Port with the value specified by Value
  and returns Value. This function must guarantee that all I/O read and write
  operations are serialized.

  If 64-bit I/O port operations are not supported, then ASSERT().

  @param  Port  The I/O port to write.
  @param  Value The value to write to the I/O port.

  @return The value written the I/O port.

**/
UINT64
EFIAPI
IoWrite64 (
  IN      UINTN                     Port,
  IN      UINT64                    Value
  );

/**
  Reads a 64-bit I/O port, performs a bitwise inclusive OR, and writes the
  result back to the 64-bit I/O port.

  Reads the 64-bit I/O port specified by Port, performs a bitwise inclusive OR
  between the read result and the value specified by OrData, and writes the
  result to the 64-bit I/O port specified by Port. The value written to the I/O
  port is returned. This function must guarantee that all I/O read and write
  operations are serialized.

  If 64-bit I/O port operations are not supported, then ASSERT().

  @param  Port    The I/O port to write.
  @param  OrData  The value to OR with the read value from the I/O port.

  @return The value written back to the I/O port.

**/
UINT64
EFIAPI
IoOr64 (
  IN      UINTN                     Port,
  IN      UINT64                    OrData
  );

/**
  Reads a 64-bit I/O port, performs a bitwise AND, and writes the result back
  to the 64-bit I/O port.

  Reads the 64-bit I/O port specified by Port, performs a bitwise AND between
  the read result and the value specified by AndData, and writes the result to
  the 64-bit I/O port specified by Port. The value written to the I/O port is
  returned. This function must guarantee that all I/O read and write operations
  are serialized.

  If 64-bit I/O port operations are not supported, then ASSERT().

  @param  Port    The I/O port to write.
  @param  AndData The value to AND with the read value from the I/O port.

  @return The value written back to the I/O port.

**/
UINT64
EFIAPI
IoAnd64 (
  IN      UINTN                     Port,
  IN      UINT64                    AndData
  );

/**
  Reads a 64-bit I/O port, performs a bitwise AND followed by a bitwise
  inclusive OR, and writes the result back to the 64-bit I/O port.

  Reads the 64-bit I/O port specified by Port, 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 64-bit I/O port specified by Port. The value
  written to the I/O port is returned. This function must guarantee that all
  I/O read and write operations are serialized.

  If 64-bit I/O port operations are not supported, then ASSERT().

  @param  Port    The I/O port to write.
  @param  AndData The value to AND with the read value from the I/O port.
  @param  OrData  The value to OR with the result of the AND operation.

  @return The value written back to the I/O port.

**/
UINT64
EFIAPI
IoAndThenOr64 (
  IN      UINTN                     Port,
  IN      UINT64                    AndData,
  IN      UINT64                    OrData
  );

/**
  Reads a bit field of an I/O register.

  Reads the bit field in a 64-bit I/O register. The bit field is specified by
  the StartBit and the EndBit. The value of the bit field is returned.

  If 64-bit I/O port operations are not supported, then ASSERT().
  If StartBit is greater than 63, then ASSERT().
  If EndBit is greater than 63, then ASSERT().
  If EndBit is less than StartBit, then ASSERT().

  @param  Port      The I/O port to read.
  @param  StartBit  The ordinal of the least significant bit in the bit field.
                    Range 0..63.
  @param  EndBit    The ordinal of the most significant bit in the bit field.
                    Range 0..63.

  @return The value read.

**/
UINT64
EFIAPI
IoBitFieldRead64 (
  IN      UINTN                     Port,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit
  );

/**
  Writes a bit field to an I/O register.

  Writes Value to the bit field of the I/O register. The bit field is specified
  by the StartBit and the EndBit. All other bits in the destination I/O
  register are preserved. The value written to the I/O port is returned. Extra
  left bits in Value are stripped.

  If 64-bit I/O port operations are not supported, then ASSERT().
  If StartBit is greater than 63, then ASSERT().
  If EndBit is greater than 63, then ASSERT().
  If EndBit is less than StartBit, then ASSERT().

  @param  Port      The I/O port to write.
  @param  StartBit  The ordinal of the least significant bit in the bit field.
                    Range 0..63.
  @param  EndBit    The ordinal of the most significant bit in the bit field.
                    Range 0..63.
  @param  Value     New value of the bit field.

  @return The value written back to the I/O port.

**/
UINT64
EFIAPI
IoBitFieldWrite64 (
  IN      UINTN                     Port,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT64                    Value
  );

/**
  Reads a bit field in a 64-bit port, performs a bitwise OR, and writes the
  result back to the bit field in the 64-bit port.

  Reads the 64-bit I/O port specified by Port, performs a bitwise inclusive OR
  between the read result and the value specified by OrData, and writes the
  result to the 64-bit I/O port specified by Port. The value written to the I/O
  port is returned. This function must guarantee that all I/O read and write
  operations are serialized. Extra left bits in OrData are stripped.

  If 64-bit I/O port operations are not supported, then ASSERT().
  If StartBit is greater than 63, then ASSERT().
  If EndBit is greater than 63, then ASSERT().
  If EndBit is less than StartBit, then ASSERT().

  @param  Port      The I/O port to write.
  @param  StartBit  The ordinal of the least significant bit in the bit field.
                    Range 0..63.
  @param  EndBit    The ordinal of the most significant bit in the bit field.
                    Range 0..63.
  @param  OrData    The value to OR with the read value from the I/O port.

  @return The value written back to the I/O port.

**/
UINT64
EFIAPI
IoBitFieldOr64 (
  IN      UINTN                     Port,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT64                    OrData
  );

/**