From: Anthony Liguori <anthony@codemonkey.ws>
To: malc <av1474@comtv.ru>
Cc: Blue Swirl <blauwirbel@gmail.com>,
"Liu >> \"Liu, Jinsong\"" <jinsong.liu@intel.com>,
Paul Brook <paul@codesourcery.com>, Avi Kivity <avi@redhat.com>,
qemu-devel <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [PATCH v2 0/7] APIC/IOAPIC cleanup
Date: Thu, 19 Aug 2010 20:01:18 -0500 [thread overview]
Message-ID: <4C6DD3DE.506@codemonkey.ws> (raw)
In-Reply-To: <alpine.LNX.2.00.1008200251570.1410@linmac>
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.
Regards,
Anthon Liguori
>> When you look at the local APIC (apic.c) however, you see that it's the only
>> device in the tree that actually interacts with a CPUState. The notion of
>> cpu_get_current_apic() is a good example of the tricks needed to make this
>> work.
>>
>> The local APIC is a cpu feature, not a device.
>>
>> Regards,
>>
>> Anthony Liguori
>>
>>
>
next prev parent reply other threads:[~2010-08-20 1:01 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-12 21:14 [Qemu-devel] [PATCH v2 0/7] APIC/IOAPIC cleanup Blue Swirl
2010-06-13 16:56 ` [Qemu-devel] " Jan Kiszka
2010-06-13 17:03 ` Andreas Färber
2010-06-13 17:53 ` Blue Swirl
2010-06-13 18:17 ` Andreas Färber
2010-06-13 17:49 ` Blue Swirl
2010-08-19 19:33 ` [Qemu-devel] " Anthony Liguori
2010-08-19 20:09 ` Blue Swirl
2010-08-19 20:49 ` Anthony Liguori
2010-08-19 21:21 ` Blue Swirl
2010-08-19 21:51 ` Anthony Liguori
2010-08-19 22:52 ` malc
2010-08-20 1:01 ` Anthony Liguori [this message]
2010-08-20 10:00 ` malc
2010-08-20 8:42 ` [Qemu-devel] " Paolo Bonzini
2010-08-20 17:01 ` [Qemu-devel] " Markus Armbruster
2010-08-20 18:38 ` Anthony Liguori
2010-08-22 20:28 ` Avi Kivity
2010-08-22 21:02 ` Anthony Liguori
2010-08-23 5:46 ` Avi Kivity
2010-08-23 13:23 ` Anthony Liguori
2010-08-23 13:42 ` Avi Kivity
2010-08-23 13:48 ` Anthony Liguori
2010-08-23 14:00 ` Avi Kivity
2010-08-23 14:26 ` Anthony Liguori
2010-08-23 14:32 ` Avi Kivity
2010-08-23 14:47 ` Anthony Liguori
2010-08-23 15:10 ` Markus Armbruster
2010-08-23 16:05 ` Anthony Liguori
2010-08-23 17:36 ` Markus Armbruster
2010-08-23 17:47 ` Anthony Liguori
2010-08-23 18:24 ` [Qemu-devel] " Jan Kiszka
2010-08-23 18:29 ` Anthony Liguori
2010-08-23 15:14 ` [Qemu-devel] " Avi Kivity
2010-08-23 16:02 ` Anthony Liguori
2010-08-24 9:51 ` Avi Kivity
2010-08-20 19:26 ` Blue Swirl
2010-08-20 10:35 ` [Qemu-devel] " Jan Kiszka
2010-08-22 9:37 ` [Qemu-devel] " Avi Kivity
2010-08-22 18:52 ` Anthony Liguori
2010-08-22 19:44 ` Avi Kivity
2010-08-22 20:03 ` Anthony Liguori
2010-08-22 20:33 ` Avi Kivity
2010-08-22 21:06 ` Anthony Liguori
2010-08-23 5:49 ` Avi Kivity
2010-08-23 9:09 ` [Qemu-devel] " Jan Kiszka
2010-08-23 9:25 ` Avi Kivity
2010-08-23 10:11 ` Alexander Graf
2010-08-23 10:15 ` Avi Kivity
2010-08-23 10:18 ` Alexander Graf
2010-08-23 10:25 ` Avi Kivity
2010-08-22 21:07 ` [Qemu-devel] " Anthony Liguori
2010-08-23 5:48 ` Avi Kivity
2010-08-22 9:13 ` Avi Kivity
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