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Re: [Qemu-devel] [PATCH v2 0/7] APIC/IOAPIC cleanup
From: |
malc |
Subject: |
Re: [Qemu-devel] [PATCH v2 0/7] APIC/IOAPIC cleanup |
Date: |
Fri, 20 Aug 2010 14:00:13 +0400 (MSD) |
User-agent: |
Alpine 2.00 (LNX 1167 2008-08-23) |
On Thu, 19 Aug 2010, Anthony Liguori wrote:
> On 08/19/2010 05:52 PM, malc wrote:
> > > Yes, but the programming model was different.
> > >
> > > Look at the PIC compared to the lapic. The PIC is programmed via pio at a
> > > fixed location. There is only one PIC and it interacts with the system
> > > just
> > > like all other devices. IOW, there is no reference to CPUState.
> > >
> > There are two PICs actually there's a cascade..
> >
>
> Technically speaking, originally there was just one and then more IRQs were
> supported by cascading and reserving an IRQ line for supporting cascading. I
> think you can technical cascade with any IRQ and have more than one slave but
> the historic PC architecture only had one slave AFAIK.
One master + one slave = 2 PICs, i guess you've meant that originally
there was no slave.
[..snip..]
--
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- Re: [Qemu-devel] [PATCH v2 0/7] APIC/IOAPIC cleanup, Anthony Liguori, 2010/08/19
- Re: [Qemu-devel] [PATCH v2 0/7] APIC/IOAPIC cleanup, Blue Swirl, 2010/08/19
- [Qemu-devel] Re: [PATCH v2 0/7] APIC/IOAPIC cleanup, Paolo Bonzini, 2010/08/20
- Re: [Qemu-devel] [PATCH v2 0/7] APIC/IOAPIC cleanup, Markus Armbruster, 2010/08/20
- Re: [Qemu-devel] [PATCH v2 0/7] APIC/IOAPIC cleanup, Anthony Liguori, 2010/08/20
- Re: [Qemu-devel] [PATCH v2 0/7] APIC/IOAPIC cleanup, Avi Kivity, 2010/08/22
- Re: [Qemu-devel] [PATCH v2 0/7] APIC/IOAPIC cleanup, Anthony Liguori, 2010/08/22
- Re: [Qemu-devel] [PATCH v2 0/7] APIC/IOAPIC cleanup, Avi Kivity, 2010/08/23
- Re: [Qemu-devel] [PATCH v2 0/7] APIC/IOAPIC cleanup, Anthony Liguori, 2010/08/23
- Re: [Qemu-devel] [PATCH v2 0/7] APIC/IOAPIC cleanup, Avi Kivity, 2010/08/23
- Re: [Qemu-devel] [PATCH v2 0/7] APIC/IOAPIC cleanup, Anthony Liguori, 2010/08/23
- Re: [Qemu-devel] [PATCH v2 0/7] APIC/IOAPIC cleanup, Avi Kivity, 2010/08/23