Hello. Maciej W. Rozycki 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... ;-)
Ask and be ignored. :-)
I think he was perfectly right, though -- this is a pair of PC/XT-class PICs.
Coupled as only in PC/AT-class machines. So, this XT qualification is actually meaningless. It's 8259A, that's all.
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.
I don't follow you here.
Maciej
WBR, Sergei
