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>>>>> "Jason" == Jason Thorpe <thorpej@nas.nasa.gov> writes:
    Jason> On Thu, 19 Feb 1998 10:35:20 -0500 "Perry E. Metzger"
    Jason> <perry@piermont.com> wrote:

    >> > I could be wrong, but I thought it used to be okay for
    >> devices > to share irq?  Was that never the case or have things
    >> changed?
    >> 
    >> This was never the case.

    Jason> Incorrect.  The software has allowed interrupt sharing for
    Jason> a long time, and it works fine if the hardware can deal
    Jason> with it.

  Perhaps it should be explained that the choice of edge vs level is
done in the 8239 chips. DOS/BIOS has always configured it for
edge. That has meant that DOS/Windows at least up to DOS 5, Win3.11,
and possibly OS/2 have been unable to share IRQs since they depended
upon the bios to handle many things. I don't know about Win95/NT. I
think that SCO/ISC SysV3.2 also left things as the bios had configured
it.
  NetBSD configures the 8239s itself. I assume that the PCI chipsets
have all sorts of other do-dads around the "pseudo-8239s" in the
support chipset (Triton, etc..)

]    Stuck in Burlington, MA... does anyone ever walk anywhere? |  SSH IPsec  [
]   Michael Richardson, Sandelman Software Works, Ottawa, ON    |international[
] mcr@sandelman.ottawa.on.ca http://www.sandelman.ottawa.on.ca/ |strong crypto[
] panic("Just another NetBSD/notebook using, kernel hacking, security guy");  [

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