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

From: Avi Kivity
Subject: Re: [Qemu-devel] [PATCH 1/2] Route PC irqs to ISA bus instead of i8259 directly
Date: Mon, 10 Aug 2009 12:43:32 +0300
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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.

error compiling committee.c: too many arguments to function

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