Re: [Qemu-devel] [PATCH 1/2] Route PC irqs to ISA bus instead of i8259 directly

[Avi Kivity]

On 08/10/2009 12:04 PM, Alexander Graf wrote:
> Am 09.08.2009 um 18:44 schrieb Avi Kivity <address@hidden>:
>
> > A PC has its motherboard IRQ lines connected to both the PIC and IOAPIC.
> > Currently, qemu routes IRQs to the PIC which then calls the IOAPIC, an
> > incestuous arrangement.  In order to clean this up, create a new ISA IRQ
> > abstraction, and have devices raise ISA IRQs (which in turn raise the 
> > i8259
> > IRQs as usual).
>
> Is this really true? From my understanding the PIC in modern systems 
> is emulated through the IOAPIC, which is the reason we have legacy 
> interrupts.

For the PC emulated by qemu, it is certainly true.  I don't know for 
sure about modern PCs, but I bet they do respond to the PIC io ports.

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