I have a comment about the existing _PLD support in Linux.
It uses bitfields, and these are known to not be reliable when using them to extract bits from a predefined bit-packed data structure. (different compilers implement bitfields differently, and there are also endian considerations.)
We are working on a patch to remove these bitfield definitions and also create a function that returns a useable struct from _PLD.
Bob
> +struct acpi_pld {
> + unsigned int revision:7; /* 0 */
> + unsigned int ignore_colour:1; /* 7 */
> + unsigned int colour:24; /* 8 */
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