[haiku-development] Re: Free irq
- From: Stefano Ceccherini <stefano.ceccherini@xxxxxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Wed, 12 Oct 2011 10:57:23 +0200
Il giorno 12/ott/2011 10.49, "Michael Lotz" <mmlr@xxxxxxxx> ha scritto:
>
> Hi Stefano
Hi Michael,
> Without further information I can only imagine that you're out
> to use MSI(-X)? If so then there's MSI allocation in the arch
> specific kernel section with a very simplistic API currently
> only used by the FreeBSD compat layer (see
> headers/private/kernel/arch/x86/msi.h). The allocation
> function returns the destination address and data to be
> programmed into the hardware.
I'm using old style interrupts atm, but HPET (I've converted the code in the
kernel to a driver to ease testing) supports MSI interrupts too, but not on
QEMU though) so I have to use regular interrupts as a fallback at least.
> If you're not going for MSIs then no, there's no API. The
> ioapic_is_interrupt_available() function tells you if a given
> interrupt is used by the IO-APIC, but there's no such thing
> for MSIs yet.
>
> Regards
> Michael
Ok, I guess that could be sufficient, no?
Thanks!
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