NAME
intio —
hp300 internal I/O space
driver
SYNOPSIS
intio0 at mainbus0
DESCRIPTION
intio is a virtual device corresponding to the hp300
internal I/O space.
Internal I/O space spans the hp300 physical address space, and is mapped permanently in the kernel virtual space at the very early time of the kernel startup procedure.
intio driver manages the internal I/O
space of hp300.
- Address range management to avoid confliction of address space of which devices probe by touching hardware port is difficult.
- Interrupt vector management.
- bus_space(9) and bus_dma(9) implementation.
- Other utility functions.
intio is always required to run the
NetBSD kernel.