From: "Petr Vandrovec" <VANDROVE@vc.cvut.cz>
To: bugghy <bugghy@SAFe-mail.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: address of int80 idt
Date: Thu, 15 Jul 2004 17:38:30 +0200 [thread overview]
Message-ID: <C32704C118F@vcnet.vc.cvut.cz> (raw)
On 15 Jul 04 at 18:27, bugghy wrote:
>
> The problem is that on some kernels 2.4.22 (and I think on 2.6.7, 2.2.26
> and 2.4.26 too) on vmware sidt returns a bogus address for idtr.base:
> idtr.base=0xffc6a370 (2.4.22)
>
> If I try to read from /dev/kmem from this address it doesn't work.
It is feature, not a bug... Well, it is bug, but not easily fixable.
Either check 'Disable acceleration' checkbox in VM configuration, or,
if you want portable solution (if your program has root privileges), call
iopl(3) before issuing sidt. Or issue sidt in the kernel, not in userspace.
Best regards,
Petr Vandrovec
next reply other threads:[~2004-07-15 15:38 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-15 15:38 Petr Vandrovec [this message]
-- strict thread matches above, loose matches on Subject: below --
2004-07-15 18:27 address of int80 idt bugghy
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