From: Paolo Bonzini <pbonzini@redhat.com>
To: Jan Beulich <JBeulich@suse.com>
Cc: xen-devel@lists.xen.org
Subject: Re: [PATCH] xen: find a better location for the real-mode trampoline
Date: Tue, 18 Dec 2012 14:39:04 +0100 [thread overview]
Message-ID: <50D071F8.8040509@redhat.com> (raw)
In-Reply-To: <50D07F8802000078000B1091@nat28.tlf.novell.com>
Il 18/12/2012 14:36, Jan Beulich ha scritto:
>>>> >>> No, just busy. I agree that checking all three is best. However, there
>>>> >>> is at least one known case where 0x40e doesn't work, so 0x413 and
>>>> >>> multiboot should be enough.
>>> >>
>>> >> Can you provide more detail about this specific case? In
>>> >> particular, what value 0x40e in fact has there?
>> >
>> > Sure. 0x40e did point to the beginning of the EBDA (around 635k), but
>> > an option ROM was reserving memory below there by lowering 0x413.
>> > That's the "on some machines" in the commit message.
> That wouldn't preclude the suggested sanity-checked-minimum
> solution.
Yes, on the other hand [0x413] should always be less than or equal to
[0x40e] << 6. Otherwise for example DOS would not work on that system.
Paolo
prev parent reply other threads:[~2012-12-18 13:39 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-29 17:34 [PATCH] xen: find a better location for the real-mode trampoline Paolo Bonzini
2012-11-30 8:33 ` Jan Beulich
2012-12-07 21:23 ` Konrad Rzeszutek Wilk
2012-12-10 9:34 ` Jan Beulich
2012-12-18 13:07 ` Jan Beulich
2012-12-18 13:22 ` Paolo Bonzini
2012-12-18 13:27 ` Jan Beulich
2012-12-18 13:28 ` Paolo Bonzini
2012-12-18 13:36 ` Jan Beulich
2012-12-18 13:39 ` Paolo Bonzini [this message]
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