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
