Re: [PATCH] Import updates from i386's i8259.c

["Maciej W. Rozycki" <macro@linux-mips.org>]

On Wed, 6 Dec 2006, Sergei Shtylyov wrote:

> > +static struct irq_chip i8259A_chip = {
> > +   .name           = "XT-PIC",
> > +   .mask           = disable_8259A_irq,
> > +   .unmask         = enable_8259A_irq,
> > +   .mask_ack       = mask_and_ack_8259A,
> >  };
> 
>    I wonder whose idea was to call this device XT-PIC. XT never had dual 8259A
> PICs and so was capable of handling only 8 IRQs. Dual 8259A was first used in
> the AT class machines...

 Ask Ingo, perhaps... ;-)  I think he was perfectly right, though -- this 
is a pair of PC/XT-class PICs.  And with the "IO-APIC-edge" and 
"IO-APIC-level" alternatives back when the concept of IRQ controllers was 
introduced, "XT-PIC" rather than "8259A" sounded quite right.

  Maciej