From: "H. Peter Anvin" <hpa@zytor.com>
To: Bjorn Helgaas <bhelgaas@google.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Ralf Jung <ralfjung-e@gmx.de>,
Cyrill Gorcunov <gorcunov@openvz.org>,
Yinghai Lu <yinghai@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/2] x86, ioapic: Reserve only 128 bytes for IOAPICs
Date: Thu, 25 Aug 2011 18:41:57 -0700 [thread overview]
Message-ID: <4E56F9E5.4000005@zytor.com> (raw)
In-Reply-To: <CAErSpo7N3UBJgQTb+zePnsf5YuFSQT8zy9CftwceyAKKfcHUjA@mail.gmail.com>
On 08/25/2011 05:17 PM, Bjorn Helgaas wrote:
>
> If the OS allocated the next 128 bytes to another device, it sounds
> like it would cause a conflict on Intel boxes. This must be an area
> that differs between vendors. I haven't seen a spec that mentions 256
> bytes as the required minimum MMIO size for IOAPICs, and apparently
> the AMD IOAPIC decodes 240 bytes or fewer.
>
For what it's worth, it's probably a bad idea on x86 for the OS to
allocate addresses in the 0xFExxxxxx range...
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
next prev parent reply other threads:[~2011-08-26 1:43 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-25 23:05 [PATCH 1/2] x86, ioapic: Reserve only 128 bytes for IOAPICs Bjorn Helgaas
2011-08-25 23:05 ` [PATCH 2/2] x86, ioapic: Announce resources reserved " Bjorn Helgaas
2011-08-25 23:33 ` [PATCH 1/2] x86, ioapic: Reserve only 128 bytes " Suresh Siddha
2011-08-26 0:17 ` Bjorn Helgaas
2011-08-26 1:41 ` H. Peter Anvin [this message]
2011-08-26 6:18 ` Yinghai Lu
2011-08-26 6:48 ` Cyrill Gorcunov
2011-08-26 9:22 ` Ralf Jung
2011-08-26 9:39 ` Cyrill Gorcunov
2011-08-26 9:53 ` Ralf Jung
2011-08-26 9:56 ` Cyrill Gorcunov
2011-08-26 6:22 ` Cyrill Gorcunov
2011-08-26 16:21 ` Bjorn Helgaas
2011-08-26 16:24 ` H. Peter Anvin
2011-08-26 18:09 ` Cyrill Gorcunov
2011-08-26 18:21 ` H. Peter Anvin
2011-08-26 19:15 ` Cyrill Gorcunov
[not found] ` <CAErSpo5kEw=VTVv-=_D3hQg5oRNL9yEyJUnpP0biH=t3WRXMZw@mail.gmail.com>
2011-08-26 21:09 ` Fwd: " Ralf Jung
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