Re: Real-Time Preemption, -RT-2.6.12-final-V0.7.50-24

[William Weston <weston@sysex.net>]

On Fri, 1 Jul 2005, Karsten Wiese wrote:
> 
> <snip>
> --- linux-2.6.12-RT-50-35/arch/i386/kernel/mpparse.c	2005-06-30 16:38:00.000000000 +0200
> +++ linux-2.6.12-RT/arch/i386/kernel/mpparse.c	2005-06-29 20:30:50.000000000 +0200
> @@ -263,6 +263,7 @@
>  		return;
>  	}
>  	mp_ioapics[nr_ioapics] = *m;
> +	io_apic_base[nr_ioapics] = IO_APIC_BASE(nr_ioapics);
>  	nr_ioapics++;
>  }
>  
> @@ -914,6 +915,7 @@
>  	mp_ioapics[idx].mpc_apicaddr = address;
>  
>  	set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
> +	io_apic_base[idx] = IO_APIC_BASE(idx);
>  	mp_ioapics[idx].mpc_apicid = io_apic_get_unique_id(idx, id);
>  	mp_ioapics[idx].mpc_apicver = io_apic_get_version(idx);
> </snip>
> 
> It provides the precalculation of the ioapics's virtual address.
> Or does IO_APIC_BASE() compile to an indexed lookup?
>  then io_apic_base[] wouldn't be needed...

Thanks, Karsten.  This patch was needed to get my Xeon/HT (i865) to boot 
-50-39.  Next I'll see if IOAPIC_FAST will work.  I'll keep you posted.

--ww
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