From owner-freebsd-hackers@FreeBSD.ORG  Tue Apr 10 11:40:45 2007
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From: Alan Garfield <alan@fromorbit.com>
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Date: Tue, 10 Apr 2007 21:40:40 +1000
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Subject: Re: Finding an IRQ mapping in APIC
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On Tue, 2007-04-10 at 15:30 +1000, Alan Garfield wrote:
> On Tue, 2007-04-10 at 12:20 +1000, Alan Garfield wrote:
> > Hello all!
> > 
> > I'm wondering if someone can point me in the direction of a solution to
> > my little problem.
> > 
> > I've been porting a Linux driver across to FreeBSD and I've come against
> > this lovely little hack in it's code.
> > 
> > I've tried to bus_alloc_resource() the IOAPIC_DEFAULT_ADDR and
> > IOAPIC_WINDOW but I never seem get allocated. Plus to my
> > knowing-little-about-kernels eye this seems like a really horrid hack to
> > figure out the IRQ.
> > 
> > Any suggestions?

Well I think I've found a much nicer way that the low-level irq bashing
the Linux driver suffered from.

-------
DRIVER_MODULE(jnet, acpi, jnet_driver, jnet_devclass, 0, 0);

/**
 * jnet_probe()
 *
 * Probes for the JNet device
 */
static int
jnet_probe(device_t dev)
{       
        ACPI_HANDLE h;
        char *handle_str;

        // Only accept device types
        if(acpi_get_type(dev) != ACPI_TYPE_DEVICE)
                return(ENXIO);

        // Get the acpi handle and the device name
        h = acpi_get_handle(dev);
        handle_str = acpi_name(h);
        
        // Compare the name looking for JNET
        if(strcmp(handle_str, JNET_ACPI_NAME) != 0)
                return(ENXIO);

        // Woo we found it, set the description so we know what we are.
        device_set_desc(dev, JNET_NAME);
        return (BUS_PROBE_DEFAULT);
}
-------

I found the device was in the acpi data. I now have the interrupt and
the io ports available without any hacks (I hope).

Does this look sane to anyone??

Thanks again,

Alan.