pc386 IRQs not from i8259

Till Straumann strauman at slac.stanford.edu
Mon Apr 19 20:52:25 UTC 2010

Maybe it's the appropriate time to implement apic support.
That might be better than kludging something onto the
legacy i8259 stuff.


On 19/04/10 15:40, Joel Sherrill wrote:
> Hi,
> I am doing the groundwork for SMP support in RTEMS.
> On the x86, an OS can generate Interprocessor Interrupts
> (IPIs) to request that another CPU do something.
> Unfortunately, it appears that the current IRQ
> code is assuming that all interrupts are generated
> from the i8259's.
> The IPI can have any vector number.
> My first thought is to use the first interrupt vector
> after all the ones from the PICs and make things
> work.
> Any suggestions?

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