bitfield.c

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  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT16                    AndData
  )
{
  ASSERT (EndBit < sizeof (Operand) * 8);
  ASSERT (StartBit <= EndBit);
  return (UINT16)BitFieldAndUint (Operand, StartBit, EndBit, AndData);
}

/**
  Reads a bit field from a 16-bit value, performs a bitwise AND followed by a
  bitwise OR, and returns the result.

  Performs a bitwise AND between the bit field specified by StartBit and EndBit
  in Operand and the value specified by AndData, followed by a bitwise
  inclusive OR with value specified by OrData. All other bits in Operand are
  preserved. The new 16-bit value is returned.

  If 16-bit operations are not supported, 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  Operand   Operand on which to perform the bitfield operation.
  @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 read value from the value.
  @param  OrData    The value to OR with the result of the AND operation.

  @return The new 16-bit value.

**/
UINT16
EFIAPI
BitFieldAndThenOr16 (
  IN      UINT16                    Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT16                    AndData,
  IN      UINT16                    OrData
  )
{
  ASSERT (EndBit < sizeof (Operand) * 8);
  ASSERT (StartBit <= EndBit);
  return BitFieldOr16 (
           BitFieldAnd16 (Operand, StartBit, EndBit, AndData),
           StartBit,
           EndBit,
           OrData
           );
}

/**
  Returns a bit field from a 32-bit value.

  Returns the bitfield specified by the StartBit and the EndBit from Operand.

  If 32-bit 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  Operand   Operand on which to perform the bitfield operation.
  @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 bit field read.

**/
UINT32
EFIAPI
BitFieldRead32 (
  IN      UINT32                    Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit
  )
{
  ASSERT (EndBit < sizeof (Operand) * 8);
  ASSERT (StartBit <= EndBit);
  return (UINT32)BitFieldReadUint (Operand, StartBit, EndBit);
}

/**
  Writes a bit field to a 32-bit value, and returns the result.

  Writes Value to the bit field specified by the StartBit and the EndBit in
  Operand. All other bits in Operand are preserved. The new 32-bit value is
  returned.

  If 32-bit 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  Operand   Operand on which to perform the bitfield operation.
  @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 new 32-bit value.

**/
UINT32
EFIAPI
BitFieldWrite32 (
  IN      UINT32                    Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT32                    Value
  )
{
  ASSERT (EndBit < sizeof (Operand) * 8);
  ASSERT (StartBit <= EndBit);
  return BitFieldAndThenOr32 (Operand, StartBit, EndBit, 0, Value);
}

/**
  Reads a bit field from a 32-bit value, performs a bitwise OR, and returns the
  result.

  Performs a bitwise inclusive OR between the bit field specified by StartBit
  and EndBit in Operand and the value specified by OrData. All other bits in
  Operand are preserved. The new 32-bit value is returned.

  If 32-bit 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  Operand   Operand on which to perform the bitfield operation.
  @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 value

  @return The new 32-bit value.

**/
UINT32
EFIAPI
BitFieldOr32 (
  IN      UINT32                    Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT32                    OrData
  )
{
  ASSERT (EndBit < sizeof (Operand) * 8);
  ASSERT (StartBit <= EndBit);
  return (UINT32)BitFieldOrUint (Operand, StartBit, EndBit, OrData);
}

/**
  Reads a bit field from a 32-bit value, performs a bitwise AND, and returns
  the result.

  Performs a bitwise AND between the bit field specified by StartBit and EndBit
  in Operand and the value specified by AndData. All other bits in Operand are
  preserved. The new 32-bit value is returned.

  If 32-bit 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  Operand   Operand on which to perform the bitfield operation.
  @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 value

  @return The new 32-bit value.

**/
UINT32
EFIAPI
BitFieldAnd32 (
  IN      UINT32                    Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT32                    AndData
  )
{
  ASSERT (EndBit < sizeof (Operand) * 8);
  ASSERT (StartBit <= EndBit);
  return (UINT32)BitFieldAndUint (Operand, StartBit, EndBit, AndData);
}

/**
  Reads a bit field from a 32-bit value, performs a bitwise AND followed by a
  bitwise OR, and returns the result.

  Performs a bitwise AND between the bit field specified by StartBit and EndBit
  in Operand and the value specified by AndData, followed by a bitwise
  inclusive OR with value specified by OrData. All other bits in Operand are
  preserved. The new 32-bit value is returned.

  If 32-bit 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  Operand   Operand on which to perform the bitfield operation.
  @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 value.
  @param  OrData    The value to OR with the result of the AND operation.

  @return The new 32-bit value.

**/
UINT32
EFIAPI
BitFieldAndThenOr32 (
  IN      UINT32                    Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT32                    AndData,
  IN      UINT32                    OrData
  )
{
  ASSERT (EndBit < sizeof (Operand) * 8);
  ASSERT (StartBit <= EndBit);
  return BitFieldOr32 (
           BitFieldAnd32 (Operand, StartBit, EndBit, AndData),
           StartBit,
           EndBit,
           OrData
           );
}

/**
  Returns a bit field from a 64-bit value.

  Returns the bitfield specified by the StartBit and the EndBit from Operand.

  If 64-bit 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  Operand   Operand on which to perform the bitfield operation.
  @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 bit field read.

**/
UINT64
EFIAPI
BitFieldRead64 (
  IN      UINT64                    Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit
  )
{
  ASSERT (EndBit < sizeof (Operand) * 8);
  ASSERT (StartBit <= EndBit);
  return RShiftU64 (Operand & ~LShiftU64 ((UINT64)-2, EndBit), StartBit);
}

/**
  Writes a bit field to a 64-bit value, and returns the result.

  Writes Value to the bit field specified by the StartBit and the EndBit in
  Operand. All other bits in Operand are preserved. The new 64-bit value is
  returned.

  If 64-bit 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  Operand   Operand on which to perform the bitfield operation.
  @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 new 64-bit value.

**/
UINT64
EFIAPI
BitFieldWrite64 (
  IN      UINT64                    Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT64                    Value
  )
{
  ASSERT (EndBit < sizeof (Operand) * 8);
  ASSERT (StartBit <= EndBit);
  return BitFieldAndThenOr64 (Operand, StartBit, EndBit, 0, Value);
}

/**
  Reads a bit field from a 64-bit value, performs a bitwise OR, and returns the
  result.

  Performs a bitwise inclusive OR between the bit field specified by StartBit
  and EndBit in Operand and the value specified by OrData. All other bits in
  Operand are preserved. The new 64-bit value is returned.

  If 64-bit 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  Operand   Operand on which to perform the bitfield operation.
  @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 value

  @return The new 64-bit value.

**/
UINT64
EFIAPI
BitFieldOr64 (
  IN      UINT64                    Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT64                    OrData
  )
{
  ASSERT (EndBit < sizeof (Operand) * 8);
  ASSERT (StartBit <= EndBit);
  return Operand |
         (LShiftU64 (OrData, StartBit) & ~LShiftU64 ((UINT64)-2, EndBit));
}

/**
  Reads a bit field from a 64-bit value, performs a bitwise AND, and returns
  the result.

  Performs a bitwise AND between the bit field specified by StartBit and EndBit
  in Operand and the value specified by AndData. All other bits in Operand are
  preserved. The new 64-bit value is returned.

  If 64-bit 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  Operand   Operand on which to perform the bitfield operation.
  @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  AndData   The value to AND with the read value from the value

  @return The new 64-bit value.

**/
UINT64
EFIAPI
BitFieldAnd64 (
  IN      UINT64                    Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT64                    AndData
  )
{
  ASSERT (EndBit < sizeof (Operand) * 8);
  ASSERT (StartBit <= EndBit);
  return Operand &
         ~(LShiftU64 (~AndData, StartBit) & ~LShiftU64 ((UINT64)-2, EndBit));
}

/**
  Reads a bit field from a 64-bit value, performs a bitwise AND followed by a
  bitwise OR, and returns the result.

  Performs a bitwise AND between the bit field specified by StartBit and EndBit
  in Operand and the value specified by AndData, followed by a bitwise
  inclusive OR with value specified by OrData. All other bits in Operand are
  preserved. The new 64-bit value is returned.

  If 64-bit 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  Operand   Operand on which to perform the bitfield operation.
  @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  AndData   The value to AND with the read value from the value.
  @param  OrData    The value to OR with the result of the AND operation.

  @return The new 64-bit value.

**/
UINT64
EFIAPI
BitFieldAndThenOr64 (
  IN      UINT64                    Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT64                    AndData,
  IN      UINT64                    OrData
  )
{
  ASSERT (EndBit < sizeof (Operand) * 8);
  ASSERT (StartBit <= EndBit);
  return BitFieldOr64 (
           BitFieldAnd64 (Operand, StartBit, EndBit, AndData),
           StartBit,
           EndBit,
           OrData
           );
}