INTIO(4)             NetBSD/hp300 Kernel Interfaces Manual            INTIO(4)

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.

           o   Address range management to avoid confliction of address space
               of which devices probe by touching hardware port is difficult.

           o   Interrupt vector management.

           o   bus_space(9) and bus_dma(9) implementation.

           o   Other utility functions.

     intio is always required to run the NetBSD kernel.

SEE ALSO
     bus_dma(9), bus_space(9)

NetBSD 5.0_STABLE             September 10, 2001             NetBSD 5.0_STABLE
