ibus(4) - NetBSD Manual Pages

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IBUS(4)              NetBSD/pmax Kernel Interfaces Manual              IBUS(4)


NAME

     ibus -- pmax internal I/O space driver


SYNOPSIS

     ibus0 at mainbus0
     ibus0 at tc? slot ? offset ?


DESCRIPTION

     ibus is a virtual device corresponding to the pmax internal I/O space
     found on DEC 2100, 3100, 5100 and 5000/200 systems.

     Internal I/O space spans the pmax physical address space, and is mapped
     permanently in the kernel virtual space at the very early time of the
     kernel startup procedure.

     ibus driver manages the internal I/O space of pmax.

           ·   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.

     ibus is always required to run the NetBSD kernel.


SEE ALSO

     intro(4), bus_dma(9), bus_space(9)

NetBSD 3.1.1                  September 12, 2001                  NetBSD 3.1.1