/**
Writes a 24-bit value to memory that may be unaligned.
This function writes the 24-bit value specified by Value to Buffer. Value is
returned. The function guarantees that the write operation does not produce
an alignment fault.
If the Buffer is NULL, then ASSERT().
@param Buffer Pointer to a 24-bit value that may be unaligned.
@param Value 24-bit value to write to Buffer.
@return The value written.
**/
UINT32
EFIAPI
WriteUnaligned24 (
OUT UINT32 *Buffer,
IN UINT32 Value
)
{
ASSERT (Buffer != NULL);
*Buffer = BitFieldWrite32 (*Buffer, 0, 23, Value);
return Value;
}
/**
Writes a bit field to a PCI configuration register.
Writes Value to the bit field of the PCI configuration register. The bit
field is specified by the StartBit and the EndBit. All other bits in the
destination PCI configuration register are preserved. The new value of the
32-bit register is returned.
If any reserved bits in Address are set, then ASSERT().
If StartBit is greater than 31, then ASSERT().
If EndBit is greater than 31, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
@param Address PCI configuration register to write.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..31.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..31.
@param Value New value of the bit field.
@return The value written back to the PCI configuration register.
**/
UINT32
EFIAPI
PciSegmentBitFieldWrite32 (
IN UINT64 Address,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT32 Value
)
{
return PciSegmentWrite32 (
Address,
BitFieldWrite32 (PciSegmentRead32 (Address), StartBit, EndBit, Value)
);
}
/**
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.
@return The value written back to the PCI configuration register.
**/
UINT32
EFIAPI
PciBitFieldWrite32 (
IN UINTN Address,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT32 Value
)
{
return PciWrite32 (
Address,
BitFieldWrite32 (PciRead32 (Address), StartBit, EndBit, Value)
);
}
