[parisc-linux] Dino and Lasi

[Alan Cox]

> What do you mean "bottom half"?
> dino_isr() to map DINO EIM registers to PCI IRQ lines (and thus
> PCI device ISRs)?

The Linux bottom halves are closest in 'other unixen' to the software interrupt
code run after the IRQ return.

Linux services any pending bottom halves after the irq completes but before
returning to the scheduled task/scheduler. Its used for deferring processing
from interrupt paths