On Fri, 21 Jan 2022, Igor Mammedov wrote:
> As for adding ACPI support to xv6, is not so difficult if you only use
> it for detecting CPUs. You only need to locate RSDP which points to
> a list of ACPI tables ((X)RSDT) and then jump and parse MADT table
> which is analog of MP table. It's all very well documented in
> ACPI spec and you can use SeaBIOS code for inspiration as well,
> look for RSDP_SIGNATURE as starting point (SeaBIOS does a lot more
> stuff with ACPI but you don't really need it (you can start with
> minimum of necessary code and then build up on top as needed)).
bios-tables-test.c in tests/qtest also has basic code to parse the various
tables. It can also be a good starting point. I also find this site
useful:
https://wiki.osdev.org/RSDP
It tells you the spec without going through the larger PDF.
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