From: Frank Kotler <fbkotler@verizon.net>
To: A D <a_d_249@hotmail.com>
Cc: hvjunk@gmail.com, linux-assembly@vger.kernel.org
Subject: Re: Segment override and lldt instruction
Date: Sun, 10 Jun 2007 21:14:00 -0400 [thread overview]
Message-ID: <466CA1D8.9090600@verizon.net> (raw)
In-Reply-To: <BAY133-F2621988146A83572C34FFBF51A0@phx.gbl>
A D wrote:
>>> Frank Kotler wrote:
>>> In "Linux assembly", there is no reason you'd *want* to use a segment
>>> override, or alter a segment register.
>>
>>
>> Hendrik Visage wrote:
>> Not while your program and/or data space fits in 4GB of memory space ;)
>
>
> So please correct my understanding if i'm wrong: it is not possible
> or necessary to override segment register in protected mode but one can do
> the same thing in real mode. right?
Right. (In Windows, you might want to do [fs:somevalue] - Windows uses
fs for "thread local storage"(???) - a descriptor that does *not* have a
base of 0, and limit is... 64k-1(???)... I think)
> So if answer is yes, and if more
> than 4GB
> of memory space is needed for a program how will segmentation register go
> beyond 4gig without override?
Dunno. I'll leave that one to Hendrik. :)
Best,
Frank
next prev parent reply other threads:[~2007-06-11 1:14 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-30 22:31 Segment override and lldt instruction A D
2007-05-31 0:45 ` Frank Kotler
2007-05-31 1:21 ` A D
2007-06-04 23:52 ` Hendrik Visage
2007-06-11 0:33 ` A D
2007-06-11 1:14 ` Frank Kotler [this message]
2007-06-11 5:30 ` Brian Raiter
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