Re: PCI code from FreeBSD

[Sepherosa Ziehau <sepherosa@xxxxxxxxx>]

On Fri, Jul 3, 2009 at 9:50 AM, Sepherosa Ziehau<sepherosa@gmail.com> wrote:
> On Fri, Jul 3, 2009 at 2:01 AM, Matthew
> Dillon<dillon@apollo.backplane.com> wrote:
>>
>> :Yep. All the ACPI-related work is here:
>> :
>> :       http://github.com/polachok/dragonflybsd/tree/acpi2
>> :
>> :See dmesg attached for example.
>
> It shows ICU works.
>
>>
>>    Ok, how does this integrate with the APIC_IO kernel config
>>    option verses not having it?  Will not having APIC_IO still
>>    back-off to just using the BIOS intr defaults for the
>>    ICU (8259)?
>
> I think before bringing the ACPI code, we have to change our APIC
> interrupt handling code:
> FreeBSD uses ACPI GSI (ACPI3.0a, page120) concept directly (I think
> they apply it to the MP table too).  So more than 24 idt vectors may
> be used, if, for example, there are two 24pin I/O APICs.  As far as I
> understand our apic_abi.c, we only support 24 idt vectors; and the
> gd_[if]pending limit us to 32 vectors.  Before we could sort that out
> or at least introduce another mapping layer, bringing in ACPI routing

BTW, I prefer not to introduce another mapping layer, so we could
prepare the MSI/MSI-X work :)

Best Regards,
sephe

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