This crate provides types for representing the RSDP (the Root System Descriptor Table; the first ACPI table)
and methods for searching for it on BIOS systems. Importantly, this crate (unlike acpi, which re-exports the
contents of this crate) does not need alloc, and so can be used in environments that can't allocate. This is
specifically meant to be used from bootloaders for finding the RSDP, so it can be passed to the payload.
To use this crate, you will need to provide an implementation of AcpiHandler. This is the same handler type
used in the acpi crate.